2382 lines
70 KiB
JavaScript
2382 lines
70 KiB
JavaScript
// @flow
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// A recursive descent parser operates by defining functions for all
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// syntactic elements, and recursively calling those, each function
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// advancing the input stream and returning an AST node. Precedence
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// of constructs (for example, the fact that `!x[1]` means `!(x[1])`
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// instead of `(!x)[1]` is handled by the fact that the parser
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// function that parses unary prefix operators is called first, and
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// in turn calls the function that parses `[]` subscripts — that
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// way, it'll receive the node for `x[1]` already parsed, and wraps
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// *that* in the unary operator node.
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//
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// Acorn uses an [operator precedence parser][opp] to handle binary
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// operator precedence, because it is much more compact than using
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// the technique outlined above, which uses different, nesting
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// functions to specify precedence, for all of the ten binary
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// precedence levels that JavaScript defines.
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//
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// [opp]: http://en.wikipedia.org/wiki/Operator-precedence_parser
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import { types as tt, type TokenType } from "../tokenizer/types";
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import * as N from "../types";
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import LValParser from "./lval";
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import {
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isKeyword,
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isReservedWord,
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isStrictReservedWord,
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isStrictBindReservedWord,
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} from "../util/identifier";
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import type { Pos, Position } from "../util/location";
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import * as charCodes from "charcodes";
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import {
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BIND_OUTSIDE,
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BIND_VAR,
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functionFlags,
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SCOPE_ARROW,
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SCOPE_CLASS,
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SCOPE_DIRECT_SUPER,
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SCOPE_SUPER,
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SCOPE_PROGRAM,
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} from "../util/scopeflags";
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const unwrapParenthesizedExpression = node => {
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return node.type === "ParenthesizedExpression"
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? unwrapParenthesizedExpression(node.expression)
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: node;
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};
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export default class ExpressionParser extends LValParser {
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// Forward-declaration: defined in statement.js
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+parseBlock: (
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allowDirectives?: boolean,
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createNewLexicalScope?: boolean,
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) => N.BlockStatement;
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+parseClass: (
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node: N.Class,
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isStatement: boolean,
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optionalId?: boolean,
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) => N.Class;
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+parseDecorators: (allowExport?: boolean) => void;
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+parseFunction: <T: N.NormalFunction>(
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node: T,
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statement?: number,
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allowExpressionBody?: boolean,
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isAsync?: boolean,
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) => T;
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+parseFunctionParams: (node: N.Function, allowModifiers?: boolean) => void;
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+takeDecorators: (node: N.HasDecorators) => void;
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// Check if property name clashes with already added.
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// Object/class getters and setters are not allowed to clash —
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// either with each other or with an init property — and in
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// strict mode, init properties are also not allowed to be repeated.
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checkPropClash(
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prop: N.ObjectMember | N.SpreadElement,
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propHash: { [key: string]: boolean },
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): void {
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if (
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prop.type === "SpreadElement" ||
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prop.computed ||
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prop.kind ||
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// $FlowIgnore
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prop.shorthand
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) {
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return;
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}
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const key = prop.key;
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// It is either an Identifier or a String/NumericLiteral
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const name = key.type === "Identifier" ? key.name : String(key.value);
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if (name === "__proto__") {
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if (propHash.proto) {
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this.raise(key.start, "Redefinition of __proto__ property");
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}
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propHash.proto = true;
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}
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}
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// Convenience method to parse an Expression only
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getExpression(): N.Expression {
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this.scope.enter(SCOPE_PROGRAM);
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this.nextToken();
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const expr = this.parseExpression();
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if (!this.match(tt.eof)) {
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this.unexpected();
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}
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expr.comments = this.state.comments;
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return expr;
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}
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// ### Expression parsing
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// These nest, from the most general expression type at the top to
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// 'atomic', nondivisible expression types at the bottom. Most of
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// the functions will simply let the function (s) below them parse,
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// and, *if* the syntactic construct they handle is present, wrap
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// the AST node that the inner parser gave them in another node.
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// Parse a full expression. The optional arguments are used to
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// forbid the `in` operator (in for loops initialization expressions)
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// and provide reference for storing '=' operator inside shorthand
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// property assignment in contexts where both object expression
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// and object pattern might appear (so it's possible to raise
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// delayed syntax error at correct position).
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parseExpression(noIn?: boolean, refShorthandDefaultPos?: Pos): N.Expression {
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const startPos = this.state.start;
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const startLoc = this.state.startLoc;
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const expr = this.parseMaybeAssign(noIn, refShorthandDefaultPos);
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if (this.match(tt.comma)) {
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const node = this.startNodeAt(startPos, startLoc);
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node.expressions = [expr];
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while (this.eat(tt.comma)) {
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node.expressions.push(
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this.parseMaybeAssign(noIn, refShorthandDefaultPos),
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);
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}
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this.toReferencedList(node.expressions);
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return this.finishNode(node, "SequenceExpression");
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}
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return expr;
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}
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// Parse an assignment expression. This includes applications of
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// operators like `+=`.
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parseMaybeAssign(
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noIn?: ?boolean,
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refShorthandDefaultPos?: ?Pos,
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afterLeftParse?: Function,
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refNeedsArrowPos?: ?Pos,
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): N.Expression {
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const startPos = this.state.start;
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const startLoc = this.state.startLoc;
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if (this.isContextual("yield")) {
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if (this.scope.inGenerator) {
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let left = this.parseYield(noIn);
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if (afterLeftParse) {
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left = afterLeftParse.call(this, left, startPos, startLoc);
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}
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return left;
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} else {
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// The tokenizer will assume an expression is allowed after
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// `yield`, but this isn't that kind of yield
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this.state.exprAllowed = false;
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}
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}
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const oldCommaAfterSpreadAt = this.state.commaAfterSpreadAt;
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this.state.commaAfterSpreadAt = -1;
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let failOnShorthandAssign;
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if (refShorthandDefaultPos) {
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failOnShorthandAssign = false;
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} else {
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refShorthandDefaultPos = { start: 0 };
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failOnShorthandAssign = true;
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}
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if (this.match(tt.parenL) || this.match(tt.name)) {
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this.state.potentialArrowAt = this.state.start;
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}
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let left = this.parseMaybeConditional(
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noIn,
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refShorthandDefaultPos,
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refNeedsArrowPos,
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);
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if (afterLeftParse) {
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left = afterLeftParse.call(this, left, startPos, startLoc);
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}
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if (this.state.type.isAssign) {
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const node = this.startNodeAt(startPos, startLoc);
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const operator = this.state.value;
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node.operator = operator;
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if (operator === "??=") {
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this.expectPlugin("nullishCoalescingOperator");
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this.expectPlugin("logicalAssignment");
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}
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if (operator === "||=" || operator === "&&=") {
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this.expectPlugin("logicalAssignment");
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}
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node.left = this.match(tt.eq)
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? this.toAssignable(left, undefined, "assignment expression")
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: left;
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refShorthandDefaultPos.start = 0; // reset because shorthand default was used correctly
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this.checkLVal(left, undefined, undefined, "assignment expression");
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const maybePattern = unwrapParenthesizedExpression(left);
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let patternErrorMsg;
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if (maybePattern.type === "ObjectPattern") {
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patternErrorMsg = "`({a}) = 0` use `({a} = 0)`";
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} else if (maybePattern.type === "ArrayPattern") {
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patternErrorMsg = "`([a]) = 0` use `([a] = 0)`";
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}
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if (
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patternErrorMsg &&
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((left.extra && left.extra.parenthesized) ||
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left.type === "ParenthesizedExpression")
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) {
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this.raise(
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maybePattern.start,
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`You're trying to assign to a parenthesized expression, eg. instead of ${patternErrorMsg}`,
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);
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}
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if (patternErrorMsg) this.checkCommaAfterRestFromSpread();
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this.state.commaAfterSpreadAt = oldCommaAfterSpreadAt;
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this.next();
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node.right = this.parseMaybeAssign(noIn);
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return this.finishNode(node, "AssignmentExpression");
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} else if (failOnShorthandAssign && refShorthandDefaultPos.start) {
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this.unexpected(refShorthandDefaultPos.start);
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}
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this.state.commaAfterSpreadAt = oldCommaAfterSpreadAt;
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return left;
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}
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// Parse a ternary conditional (`?:`) operator.
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parseMaybeConditional(
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noIn: ?boolean,
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refShorthandDefaultPos: Pos,
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refNeedsArrowPos?: ?Pos,
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): N.Expression {
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const startPos = this.state.start;
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const startLoc = this.state.startLoc;
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const potentialArrowAt = this.state.potentialArrowAt;
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const expr = this.parseExprOps(noIn, refShorthandDefaultPos);
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if (
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expr.type === "ArrowFunctionExpression" &&
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expr.start === potentialArrowAt
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) {
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return expr;
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}
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if (refShorthandDefaultPos && refShorthandDefaultPos.start) return expr;
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return this.parseConditional(
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expr,
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noIn,
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startPos,
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startLoc,
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refNeedsArrowPos,
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);
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}
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parseConditional(
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expr: N.Expression,
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noIn: ?boolean,
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startPos: number,
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startLoc: Position,
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// FIXME: Disabling this for now since can't seem to get it to play nicely
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// eslint-disable-next-line no-unused-vars
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refNeedsArrowPos?: ?Pos,
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): N.Expression {
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if (this.eat(tt.question)) {
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const node = this.startNodeAt(startPos, startLoc);
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node.test = expr;
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node.consequent = this.parseMaybeAssign();
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this.expect(tt.colon);
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node.alternate = this.parseMaybeAssign(noIn);
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return this.finishNode(node, "ConditionalExpression");
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}
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return expr;
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}
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// Start the precedence parser.
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parseExprOps(noIn: ?boolean, refShorthandDefaultPos: Pos): N.Expression {
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const startPos = this.state.start;
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const startLoc = this.state.startLoc;
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const potentialArrowAt = this.state.potentialArrowAt;
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const expr = this.parseMaybeUnary(refShorthandDefaultPos);
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if (
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expr.type === "ArrowFunctionExpression" &&
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expr.start === potentialArrowAt
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) {
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return expr;
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}
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if (refShorthandDefaultPos && refShorthandDefaultPos.start) {
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return expr;
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}
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return this.parseExprOp(expr, startPos, startLoc, -1, noIn);
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}
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// Parse binary operators with the operator precedence parsing
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// algorithm. `left` is the left-hand side of the operator.
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// `minPrec` provides context that allows the function to stop and
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// defer further parser to one of its callers when it encounters an
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// operator that has a lower precedence than the set it is parsing.
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parseExprOp(
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left: N.Expression,
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leftStartPos: number,
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leftStartLoc: Position,
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minPrec: number,
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noIn: ?boolean,
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): N.Expression {
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const prec = this.state.type.binop;
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if (prec != null && (!noIn || !this.match(tt._in))) {
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if (prec > minPrec) {
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const operator = this.state.value;
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if (operator === "|>" && this.state.inFSharpPipelineDirectBody) {
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return left;
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}
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const node = this.startNodeAt(leftStartPos, leftStartLoc);
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node.left = left;
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node.operator = operator;
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if (
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operator === "**" &&
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left.type === "UnaryExpression" &&
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(this.options.createParenthesizedExpressions ||
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!(left.extra && left.extra.parenthesized))
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) {
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this.raise(
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left.argument.start,
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"Illegal expression. Wrap left hand side or entire exponentiation in parentheses.",
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);
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}
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const op = this.state.type;
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if (op === tt.pipeline) {
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this.expectPlugin("pipelineOperator");
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this.state.inPipeline = true;
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this.checkPipelineAtInfixOperator(left, leftStartPos);
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} else if (op === tt.nullishCoalescing) {
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this.expectPlugin("nullishCoalescingOperator");
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}
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this.next();
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if (
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op === tt.pipeline &&
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this.getPluginOption("pipelineOperator", "proposal") === "minimal"
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) {
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if (
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this.match(tt.name) &&
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this.state.value === "await" &&
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this.scope.inAsync
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) {
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throw this.raise(
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this.state.start,
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`Unexpected "await" after pipeline body; await must have parentheses in minimal proposal`,
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);
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}
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}
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node.right = this.parseExprOpRightExpr(op, prec, noIn);
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this.finishNode(
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node,
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op === tt.logicalOR ||
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op === tt.logicalAND ||
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op === tt.nullishCoalescing
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? "LogicalExpression"
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: "BinaryExpression",
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);
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return this.parseExprOp(
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node,
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leftStartPos,
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leftStartLoc,
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minPrec,
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noIn,
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);
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}
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}
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return left;
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}
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|
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// Helper function for `parseExprOp`. Parse the right-hand side of binary-
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// operator expressions, then apply any operator-specific functions.
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parseExprOpRightExpr(
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op: TokenType,
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prec: number,
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noIn: ?boolean,
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): N.Expression {
|
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const startPos = this.state.start;
|
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const startLoc = this.state.startLoc;
|
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switch (op) {
|
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case tt.pipeline:
|
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switch (this.getPluginOption("pipelineOperator", "proposal")) {
|
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case "smart":
|
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return this.withTopicPermittingContext(() => {
|
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return this.parseSmartPipelineBody(
|
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this.parseExprOpBaseRightExpr(op, prec, noIn),
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startPos,
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startLoc,
|
|
);
|
|
});
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case "fsharp":
|
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return this.withSoloAwaitPermittingContext(() => {
|
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return this.parseFSharpPipelineBody(prec, noIn);
|
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});
|
|
}
|
|
// falls through
|
|
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default:
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return this.parseExprOpBaseRightExpr(op, prec, noIn);
|
|
}
|
|
}
|
|
|
|
// Helper function for `parseExprOpRightExpr`. Parse the right-hand side of
|
|
// binary-operator expressions without applying any operator-specific functions.
|
|
|
|
parseExprOpBaseRightExpr(
|
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op: TokenType,
|
|
prec: number,
|
|
noIn: ?boolean,
|
|
): N.Expression {
|
|
const startPos = this.state.start;
|
|
const startLoc = this.state.startLoc;
|
|
|
|
return this.parseExprOp(
|
|
this.parseMaybeUnary(),
|
|
startPos,
|
|
startLoc,
|
|
op.rightAssociative ? prec - 1 : prec,
|
|
noIn,
|
|
);
|
|
}
|
|
|
|
// Parse unary operators, both prefix and postfix.
|
|
|
|
parseMaybeUnary(refShorthandDefaultPos: ?Pos): N.Expression {
|
|
if (
|
|
this.isContextual("await") &&
|
|
(this.scope.inAsync ||
|
|
(!this.scope.inFunction && this.options.allowAwaitOutsideFunction))
|
|
) {
|
|
return this.parseAwait();
|
|
} else if (this.state.type.prefix) {
|
|
const node = this.startNode();
|
|
const update = this.match(tt.incDec);
|
|
node.operator = this.state.value;
|
|
node.prefix = true;
|
|
|
|
if (node.operator === "throw") {
|
|
this.expectPlugin("throwExpressions");
|
|
}
|
|
this.next();
|
|
|
|
node.argument = this.parseMaybeUnary();
|
|
|
|
if (refShorthandDefaultPos && refShorthandDefaultPos.start) {
|
|
this.unexpected(refShorthandDefaultPos.start);
|
|
}
|
|
|
|
if (update) {
|
|
this.checkLVal(node.argument, undefined, undefined, "prefix operation");
|
|
} else if (this.state.strict && node.operator === "delete") {
|
|
const arg = node.argument;
|
|
|
|
if (arg.type === "Identifier") {
|
|
this.raise(node.start, "Deleting local variable in strict mode");
|
|
} else if (
|
|
arg.type === "MemberExpression" &&
|
|
arg.property.type === "PrivateName"
|
|
) {
|
|
this.raise(node.start, "Deleting a private field is not allowed");
|
|
}
|
|
}
|
|
|
|
return this.finishNode(
|
|
node,
|
|
update ? "UpdateExpression" : "UnaryExpression",
|
|
);
|
|
}
|
|
|
|
const startPos = this.state.start;
|
|
const startLoc = this.state.startLoc;
|
|
let expr = this.parseExprSubscripts(refShorthandDefaultPos);
|
|
if (refShorthandDefaultPos && refShorthandDefaultPos.start) return expr;
|
|
while (this.state.type.postfix && !this.canInsertSemicolon()) {
|
|
const node = this.startNodeAt(startPos, startLoc);
|
|
node.operator = this.state.value;
|
|
node.prefix = false;
|
|
node.argument = expr;
|
|
this.checkLVal(expr, undefined, undefined, "postfix operation");
|
|
this.next();
|
|
expr = this.finishNode(node, "UpdateExpression");
|
|
}
|
|
return expr;
|
|
}
|
|
|
|
// Parse call, dot, and `[]`-subscript expressions.
|
|
|
|
parseExprSubscripts(refShorthandDefaultPos: ?Pos): N.Expression {
|
|
const startPos = this.state.start;
|
|
const startLoc = this.state.startLoc;
|
|
const potentialArrowAt = this.state.potentialArrowAt;
|
|
const expr = this.parseExprAtom(refShorthandDefaultPos);
|
|
|
|
if (
|
|
expr.type === "ArrowFunctionExpression" &&
|
|
expr.start === potentialArrowAt
|
|
) {
|
|
return expr;
|
|
}
|
|
|
|
if (refShorthandDefaultPos && refShorthandDefaultPos.start) {
|
|
return expr;
|
|
}
|
|
|
|
return this.parseSubscripts(expr, startPos, startLoc);
|
|
}
|
|
|
|
parseSubscripts(
|
|
base: N.Expression,
|
|
startPos: number,
|
|
startLoc: Position,
|
|
noCalls?: ?boolean,
|
|
): N.Expression {
|
|
const maybeAsyncArrow = this.atPossibleAsync(base);
|
|
|
|
const state = {
|
|
optionalChainMember: false,
|
|
stop: false,
|
|
};
|
|
do {
|
|
base = this.parseSubscript(
|
|
base,
|
|
startPos,
|
|
startLoc,
|
|
noCalls,
|
|
state,
|
|
maybeAsyncArrow,
|
|
);
|
|
} while (!state.stop);
|
|
return base;
|
|
}
|
|
|
|
/**
|
|
* @param state Set 'state.stop = true' to indicate that we should stop parsing subscripts.
|
|
* state.optionalChainMember to indicate that the member is currently in OptionalChain
|
|
*/
|
|
parseSubscript(
|
|
base: N.Expression,
|
|
startPos: number,
|
|
startLoc: Position,
|
|
noCalls: ?boolean,
|
|
state: N.ParseSubscriptState,
|
|
maybeAsyncArrow: boolean,
|
|
): N.Expression {
|
|
if (!noCalls && this.eat(tt.doubleColon)) {
|
|
const node = this.startNodeAt(startPos, startLoc);
|
|
node.object = base;
|
|
node.callee = this.parseNoCallExpr();
|
|
state.stop = true;
|
|
return this.parseSubscripts(
|
|
this.finishNode(node, "BindExpression"),
|
|
startPos,
|
|
startLoc,
|
|
noCalls,
|
|
);
|
|
} else if (this.match(tt.questionDot)) {
|
|
this.expectPlugin("optionalChaining");
|
|
state.optionalChainMember = true;
|
|
if (noCalls && this.lookahead().type === tt.parenL) {
|
|
state.stop = true;
|
|
return base;
|
|
}
|
|
this.next();
|
|
|
|
const node = this.startNodeAt(startPos, startLoc);
|
|
|
|
if (this.eat(tt.bracketL)) {
|
|
node.object = base;
|
|
node.property = this.parseExpression();
|
|
node.computed = true;
|
|
node.optional = true;
|
|
this.expect(tt.bracketR);
|
|
return this.finishNode(node, "OptionalMemberExpression");
|
|
} else if (this.eat(tt.parenL)) {
|
|
node.callee = base;
|
|
node.arguments = this.parseCallExpressionArguments(tt.parenR, false);
|
|
node.optional = true;
|
|
return this.finishNode(node, "OptionalCallExpression");
|
|
} else {
|
|
node.object = base;
|
|
node.property = this.parseIdentifier(true);
|
|
node.computed = false;
|
|
node.optional = true;
|
|
return this.finishNode(node, "OptionalMemberExpression");
|
|
}
|
|
} else if (this.eat(tt.dot)) {
|
|
const node = this.startNodeAt(startPos, startLoc);
|
|
node.object = base;
|
|
node.property = this.parseMaybePrivateName();
|
|
node.computed = false;
|
|
if (state.optionalChainMember) {
|
|
node.optional = false;
|
|
return this.finishNode(node, "OptionalMemberExpression");
|
|
}
|
|
return this.finishNode(node, "MemberExpression");
|
|
} else if (this.eat(tt.bracketL)) {
|
|
const node = this.startNodeAt(startPos, startLoc);
|
|
node.object = base;
|
|
node.property = this.parseExpression();
|
|
node.computed = true;
|
|
this.expect(tt.bracketR);
|
|
if (state.optionalChainMember) {
|
|
node.optional = false;
|
|
return this.finishNode(node, "OptionalMemberExpression");
|
|
}
|
|
return this.finishNode(node, "MemberExpression");
|
|
} else if (!noCalls && this.match(tt.parenL)) {
|
|
const oldMaybeInArrowParameters = this.state.maybeInArrowParameters;
|
|
const oldYieldPos = this.state.yieldPos;
|
|
const oldAwaitPos = this.state.awaitPos;
|
|
this.state.maybeInArrowParameters = true;
|
|
this.state.yieldPos = 0;
|
|
this.state.awaitPos = 0;
|
|
|
|
this.next();
|
|
|
|
let node = this.startNodeAt(startPos, startLoc);
|
|
node.callee = base;
|
|
|
|
const oldCommaAfterSpreadAt = this.state.commaAfterSpreadAt;
|
|
this.state.commaAfterSpreadAt = -1;
|
|
|
|
node.arguments = this.parseCallExpressionArguments(
|
|
tt.parenR,
|
|
maybeAsyncArrow,
|
|
base.type === "Import",
|
|
base.type !== "Super",
|
|
);
|
|
if (!state.optionalChainMember) {
|
|
this.finishCallExpression(node);
|
|
} else {
|
|
this.finishOptionalCallExpression(node);
|
|
}
|
|
|
|
if (maybeAsyncArrow && this.shouldParseAsyncArrow()) {
|
|
state.stop = true;
|
|
|
|
this.checkCommaAfterRestFromSpread();
|
|
|
|
node = this.parseAsyncArrowFromCallExpression(
|
|
this.startNodeAt(startPos, startLoc),
|
|
node,
|
|
);
|
|
this.checkYieldAwaitInDefaultParams();
|
|
this.state.yieldPos = oldYieldPos;
|
|
this.state.awaitPos = oldAwaitPos;
|
|
} else {
|
|
this.toReferencedListDeep(node.arguments);
|
|
|
|
// We keep the old value if it isn't null, for cases like
|
|
// (x = async(yield)) => {}
|
|
this.state.yieldPos = oldYieldPos || this.state.yieldPos;
|
|
this.state.awaitPos = oldAwaitPos || this.state.awaitPos;
|
|
}
|
|
|
|
this.state.maybeInArrowParameters = oldMaybeInArrowParameters;
|
|
this.state.commaAfterSpreadAt = oldCommaAfterSpreadAt;
|
|
|
|
return node;
|
|
} else if (this.match(tt.backQuote)) {
|
|
return this.parseTaggedTemplateExpression(
|
|
startPos,
|
|
startLoc,
|
|
base,
|
|
state,
|
|
);
|
|
} else {
|
|
state.stop = true;
|
|
return base;
|
|
}
|
|
}
|
|
|
|
parseTaggedTemplateExpression(
|
|
startPos: number,
|
|
startLoc: Position,
|
|
base: N.Expression,
|
|
state: N.ParseSubscriptState,
|
|
typeArguments?: ?N.TsTypeParameterInstantiation,
|
|
): N.TaggedTemplateExpression {
|
|
const node: N.TaggedTemplateExpression = this.startNodeAt(
|
|
startPos,
|
|
startLoc,
|
|
);
|
|
node.tag = base;
|
|
node.quasi = this.parseTemplate(true);
|
|
if (typeArguments) node.typeParameters = typeArguments;
|
|
if (state.optionalChainMember) {
|
|
this.raise(
|
|
startPos,
|
|
"Tagged Template Literals are not allowed in optionalChain",
|
|
);
|
|
}
|
|
return this.finishNode(node, "TaggedTemplateExpression");
|
|
}
|
|
|
|
atPossibleAsync(base: N.Expression): boolean {
|
|
return (
|
|
base.type === "Identifier" &&
|
|
base.name === "async" &&
|
|
this.state.lastTokEnd === base.end &&
|
|
!this.canInsertSemicolon() &&
|
|
this.input.slice(base.start, base.end) === "async"
|
|
);
|
|
}
|
|
|
|
finishCallExpression(node: N.CallExpression): N.CallExpression {
|
|
if (node.callee.type === "Import") {
|
|
if (node.arguments.length !== 1) {
|
|
this.raise(node.start, "import() requires exactly one argument");
|
|
}
|
|
|
|
const importArg = node.arguments[0];
|
|
if (importArg && importArg.type === "SpreadElement") {
|
|
this.raise(importArg.start, "... is not allowed in import()");
|
|
}
|
|
}
|
|
return this.finishNode(node, "CallExpression");
|
|
}
|
|
|
|
finishOptionalCallExpression(node: N.CallExpression): N.CallExpression {
|
|
if (node.callee.type === "Import") {
|
|
if (node.arguments.length !== 1) {
|
|
this.raise(node.start, "import() requires exactly one argument");
|
|
}
|
|
|
|
const importArg = node.arguments[0];
|
|
if (importArg && importArg.type === "SpreadElement") {
|
|
this.raise(importArg.start, "... is not allowed in import()");
|
|
}
|
|
}
|
|
return this.finishNode(node, "OptionalCallExpression");
|
|
}
|
|
|
|
parseCallExpressionArguments(
|
|
close: TokenType,
|
|
possibleAsyncArrow: boolean,
|
|
dynamicImport?: boolean,
|
|
allowPlaceholder?: boolean,
|
|
): $ReadOnlyArray<?N.Expression> {
|
|
const elts = [];
|
|
let innerParenStart;
|
|
let first = true;
|
|
const oldInFSharpPipelineDirectBody = this.state.inFSharpPipelineDirectBody;
|
|
this.state.inFSharpPipelineDirectBody = false;
|
|
|
|
while (!this.eat(close)) {
|
|
if (first) {
|
|
first = false;
|
|
} else {
|
|
this.expect(tt.comma);
|
|
if (this.eat(close)) {
|
|
if (dynamicImport) {
|
|
this.raise(
|
|
this.state.lastTokStart,
|
|
"Trailing comma is disallowed inside import(...) arguments",
|
|
);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
// we need to make sure that if this is an async arrow functions,
|
|
// that we don't allow inner parens inside the params
|
|
if (this.match(tt.parenL) && !innerParenStart) {
|
|
innerParenStart = this.state.start;
|
|
}
|
|
|
|
elts.push(
|
|
this.parseExprListItem(
|
|
false,
|
|
possibleAsyncArrow ? { start: 0 } : undefined,
|
|
possibleAsyncArrow ? { start: 0 } : undefined,
|
|
allowPlaceholder,
|
|
),
|
|
);
|
|
}
|
|
|
|
// we found an async arrow function so let's not allow any inner parens
|
|
if (possibleAsyncArrow && innerParenStart && this.shouldParseAsyncArrow()) {
|
|
this.unexpected();
|
|
}
|
|
|
|
this.state.inFSharpPipelineDirectBody = oldInFSharpPipelineDirectBody;
|
|
|
|
return elts;
|
|
}
|
|
|
|
shouldParseAsyncArrow(): boolean {
|
|
return this.match(tt.arrow) && !this.canInsertSemicolon();
|
|
}
|
|
|
|
parseAsyncArrowFromCallExpression(
|
|
node: N.ArrowFunctionExpression,
|
|
call: N.CallExpression,
|
|
): N.ArrowFunctionExpression {
|
|
this.expect(tt.arrow);
|
|
this.parseArrowExpression(node, call.arguments, true);
|
|
return node;
|
|
}
|
|
|
|
// Parse a no-call expression (like argument of `new` or `::` operators).
|
|
|
|
parseNoCallExpr(): N.Expression {
|
|
const startPos = this.state.start;
|
|
const startLoc = this.state.startLoc;
|
|
return this.parseSubscripts(this.parseExprAtom(), startPos, startLoc, true);
|
|
}
|
|
|
|
// Parse an atomic expression — either a single token that is an
|
|
// expression, an expression started by a keyword like `function` or
|
|
// `new`, or an expression wrapped in punctuation like `()`, `[]`,
|
|
// or `{}`.
|
|
|
|
parseExprAtom(refShorthandDefaultPos?: ?Pos): N.Expression {
|
|
// If a division operator appears in an expression position, the
|
|
// tokenizer got confused, and we force it to read a regexp instead.
|
|
if (this.state.type === tt.slash) this.readRegexp();
|
|
|
|
const canBeArrow = this.state.potentialArrowAt === this.state.start;
|
|
let node;
|
|
|
|
switch (this.state.type) {
|
|
case tt._super:
|
|
if (!this.scope.allowSuper && !this.options.allowSuperOutsideMethod) {
|
|
this.raise(
|
|
this.state.start,
|
|
"super is only allowed in object methods and classes",
|
|
);
|
|
}
|
|
|
|
node = this.startNode();
|
|
this.next();
|
|
if (
|
|
this.match(tt.parenL) &&
|
|
!this.scope.allowDirectSuper &&
|
|
!this.options.allowSuperOutsideMethod
|
|
) {
|
|
this.raise(
|
|
node.start,
|
|
"super() is only valid inside a class constructor of a subclass. " +
|
|
"Maybe a typo in the method name ('constructor') or not extending another class?",
|
|
);
|
|
}
|
|
|
|
if (
|
|
!this.match(tt.parenL) &&
|
|
!this.match(tt.bracketL) &&
|
|
!this.match(tt.dot)
|
|
) {
|
|
this.unexpected();
|
|
}
|
|
|
|
return this.finishNode(node, "Super");
|
|
|
|
case tt._import:
|
|
node = this.startNode();
|
|
this.next();
|
|
|
|
if (this.match(tt.dot)) {
|
|
return this.parseImportMetaProperty(node);
|
|
}
|
|
|
|
this.expectPlugin("dynamicImport", node.start);
|
|
|
|
if (!this.match(tt.parenL)) {
|
|
this.unexpected(null, tt.parenL);
|
|
}
|
|
return this.finishNode(node, "Import");
|
|
case tt._this:
|
|
node = this.startNode();
|
|
this.next();
|
|
return this.finishNode(node, "ThisExpression");
|
|
|
|
case tt.name: {
|
|
node = this.startNode();
|
|
const containsEsc = this.state.containsEsc;
|
|
const id = this.parseIdentifier();
|
|
|
|
if (
|
|
!containsEsc &&
|
|
id.name === "async" &&
|
|
this.match(tt._function) &&
|
|
!this.canInsertSemicolon()
|
|
) {
|
|
this.next();
|
|
return this.parseFunction(node, undefined, true);
|
|
} else if (
|
|
canBeArrow &&
|
|
!containsEsc &&
|
|
id.name === "async" &&
|
|
this.match(tt.name) &&
|
|
!this.canInsertSemicolon()
|
|
) {
|
|
const params = [this.parseIdentifier()];
|
|
this.expect(tt.arrow);
|
|
// let foo = async bar => {};
|
|
this.parseArrowExpression(node, params, true);
|
|
return node;
|
|
}
|
|
|
|
if (canBeArrow && this.match(tt.arrow) && !this.canInsertSemicolon()) {
|
|
this.next();
|
|
this.parseArrowExpression(node, [id], false);
|
|
return node;
|
|
}
|
|
|
|
return id;
|
|
}
|
|
|
|
case tt._do: {
|
|
this.expectPlugin("doExpressions");
|
|
const node = this.startNode();
|
|
this.next();
|
|
const oldLabels = this.state.labels;
|
|
this.state.labels = [];
|
|
node.body = this.parseBlock();
|
|
this.state.labels = oldLabels;
|
|
return this.finishNode(node, "DoExpression");
|
|
}
|
|
|
|
case tt.regexp: {
|
|
const value = this.state.value;
|
|
node = this.parseLiteral(value.value, "RegExpLiteral");
|
|
node.pattern = value.pattern;
|
|
node.flags = value.flags;
|
|
return node;
|
|
}
|
|
|
|
case tt.num:
|
|
return this.parseLiteral(this.state.value, "NumericLiteral");
|
|
|
|
case tt.bigint:
|
|
return this.parseLiteral(this.state.value, "BigIntLiteral");
|
|
|
|
case tt.string:
|
|
return this.parseLiteral(this.state.value, "StringLiteral");
|
|
|
|
case tt._null:
|
|
node = this.startNode();
|
|
this.next();
|
|
return this.finishNode(node, "NullLiteral");
|
|
|
|
case tt._true:
|
|
case tt._false:
|
|
return this.parseBooleanLiteral();
|
|
|
|
case tt.parenL:
|
|
return this.parseParenAndDistinguishExpression(canBeArrow);
|
|
|
|
case tt.bracketL: {
|
|
const oldInFSharpPipelineDirectBody = this.state
|
|
.inFSharpPipelineDirectBody;
|
|
this.state.inFSharpPipelineDirectBody = false;
|
|
node = this.startNode();
|
|
this.next();
|
|
node.elements = this.parseExprList(
|
|
tt.bracketR,
|
|
true,
|
|
refShorthandDefaultPos,
|
|
);
|
|
if (!this.state.maybeInArrowParameters) {
|
|
// This could be an array pattern:
|
|
// ([a: string, b: string]) => {}
|
|
// In this case, we don't have to call toReferencedList. We will
|
|
// call it, if needed, when we are sure that it is a parenthesized
|
|
// expression by calling toReferencedListDeep.
|
|
this.toReferencedList(node.elements);
|
|
}
|
|
this.state.inFSharpPipelineDirectBody = oldInFSharpPipelineDirectBody;
|
|
return this.finishNode(node, "ArrayExpression");
|
|
}
|
|
case tt.braceL: {
|
|
const oldInFSharpPipelineDirectBody = this.state
|
|
.inFSharpPipelineDirectBody;
|
|
this.state.inFSharpPipelineDirectBody = false;
|
|
const ret = this.parseObj(false, refShorthandDefaultPos);
|
|
this.state.inFSharpPipelineDirectBody = oldInFSharpPipelineDirectBody;
|
|
return ret;
|
|
}
|
|
case tt._function:
|
|
return this.parseFunctionExpression();
|
|
|
|
case tt.at:
|
|
this.parseDecorators();
|
|
|
|
case tt._class:
|
|
node = this.startNode();
|
|
this.takeDecorators(node);
|
|
return this.parseClass(node, false);
|
|
|
|
case tt._new:
|
|
return this.parseNew();
|
|
|
|
case tt.backQuote:
|
|
return this.parseTemplate(false);
|
|
|
|
case tt.doubleColon: {
|
|
node = this.startNode();
|
|
this.next();
|
|
node.object = null;
|
|
const callee = (node.callee = this.parseNoCallExpr());
|
|
if (callee.type === "MemberExpression") {
|
|
return this.finishNode(node, "BindExpression");
|
|
} else {
|
|
throw this.raise(
|
|
callee.start,
|
|
"Binding should be performed on object property.",
|
|
);
|
|
}
|
|
}
|
|
|
|
case tt.hash: {
|
|
if (this.state.inPipeline) {
|
|
node = this.startNode();
|
|
|
|
if (
|
|
this.getPluginOption("pipelineOperator", "proposal") !== "smart"
|
|
) {
|
|
this.raise(
|
|
node.start,
|
|
"Primary Topic Reference found but pipelineOperator not passed 'smart' for 'proposal' option.",
|
|
);
|
|
}
|
|
|
|
this.next();
|
|
if (this.primaryTopicReferenceIsAllowedInCurrentTopicContext()) {
|
|
this.registerTopicReference();
|
|
return this.finishNode(node, "PipelinePrimaryTopicReference");
|
|
} else {
|
|
throw this.raise(
|
|
node.start,
|
|
`Topic reference was used in a lexical context without topic binding`,
|
|
);
|
|
}
|
|
}
|
|
}
|
|
|
|
default:
|
|
throw this.unexpected();
|
|
}
|
|
}
|
|
|
|
parseBooleanLiteral(): N.BooleanLiteral {
|
|
const node = this.startNode();
|
|
node.value = this.match(tt._true);
|
|
this.next();
|
|
return this.finishNode(node, "BooleanLiteral");
|
|
}
|
|
|
|
parseMaybePrivateName(): N.PrivateName | N.Identifier {
|
|
const isPrivate = this.match(tt.hash);
|
|
|
|
if (isPrivate) {
|
|
this.expectOnePlugin(["classPrivateProperties", "classPrivateMethods"]);
|
|
const node = this.startNode();
|
|
this.next();
|
|
this.assertNoSpace("Unexpected space between # and identifier");
|
|
node.id = this.parseIdentifier(true);
|
|
return this.finishNode(node, "PrivateName");
|
|
} else {
|
|
return this.parseIdentifier(true);
|
|
}
|
|
}
|
|
|
|
parseFunctionExpression(): N.FunctionExpression | N.MetaProperty {
|
|
const node = this.startNode();
|
|
|
|
// We do not do parseIdentifier here because when parseFunctionExpression
|
|
// is called we already know that the current token is a "name" with the value "function"
|
|
// This will improve perf a tiny little bit as we do not do validation but more importantly
|
|
// here is that parseIdentifier will remove an item from the expression stack
|
|
// if "function" or "class" is parsed as identifier (in objects e.g.), which should not happen here.
|
|
let meta = this.startNode();
|
|
this.next();
|
|
meta = this.createIdentifier(meta, "function");
|
|
|
|
if (this.scope.inGenerator && this.eat(tt.dot)) {
|
|
return this.parseMetaProperty(node, meta, "sent");
|
|
}
|
|
return this.parseFunction(node);
|
|
}
|
|
|
|
parseMetaProperty(
|
|
node: N.MetaProperty,
|
|
meta: N.Identifier,
|
|
propertyName: string,
|
|
): N.MetaProperty {
|
|
node.meta = meta;
|
|
|
|
if (meta.name === "function" && propertyName === "sent") {
|
|
if (this.isContextual(propertyName)) {
|
|
this.expectPlugin("functionSent");
|
|
} else if (!this.hasPlugin("functionSent")) {
|
|
// The code wasn't `function.sent` but just `function.`, so a simple error is less confusing.
|
|
this.unexpected();
|
|
}
|
|
}
|
|
|
|
const containsEsc = this.state.containsEsc;
|
|
|
|
node.property = this.parseIdentifier(true);
|
|
|
|
if (node.property.name !== propertyName || containsEsc) {
|
|
this.raise(
|
|
node.property.start,
|
|
`The only valid meta property for ${meta.name} is ${
|
|
meta.name
|
|
}.${propertyName}`,
|
|
);
|
|
}
|
|
|
|
return this.finishNode(node, "MetaProperty");
|
|
}
|
|
|
|
parseImportMetaProperty(node: N.MetaProperty): N.MetaProperty {
|
|
const id = this.createIdentifier(this.startNodeAtNode(node), "import");
|
|
this.expect(tt.dot);
|
|
|
|
if (this.isContextual("meta")) {
|
|
this.expectPlugin("importMeta");
|
|
} else if (!this.hasPlugin("importMeta")) {
|
|
this.raise(
|
|
id.start,
|
|
`Dynamic imports require a parameter: import('a.js')`,
|
|
);
|
|
}
|
|
|
|
if (!this.inModule) {
|
|
this.raise(
|
|
id.start,
|
|
`import.meta may appear only with 'sourceType: "module"'`,
|
|
{ code: "BABEL_PARSER_SOURCETYPE_MODULE_REQUIRED" },
|
|
);
|
|
}
|
|
this.sawUnambiguousESM = true;
|
|
|
|
return this.parseMetaProperty(node, id, "meta");
|
|
}
|
|
|
|
parseLiteral<T: N.Literal>(
|
|
value: any,
|
|
type: /*T["kind"]*/ string,
|
|
startPos?: number,
|
|
startLoc?: Position,
|
|
): T {
|
|
startPos = startPos || this.state.start;
|
|
startLoc = startLoc || this.state.startLoc;
|
|
|
|
const node = this.startNodeAt(startPos, startLoc);
|
|
this.addExtra(node, "rawValue", value);
|
|
this.addExtra(node, "raw", this.input.slice(startPos, this.state.end));
|
|
node.value = value;
|
|
this.next();
|
|
return this.finishNode(node, type);
|
|
}
|
|
|
|
parseParenAndDistinguishExpression(canBeArrow: boolean): N.Expression {
|
|
const startPos = this.state.start;
|
|
const startLoc = this.state.startLoc;
|
|
|
|
let val;
|
|
this.expect(tt.parenL);
|
|
|
|
const oldMaybeInArrowParameters = this.state.maybeInArrowParameters;
|
|
const oldYieldPos = this.state.yieldPos;
|
|
const oldAwaitPos = this.state.awaitPos;
|
|
const oldInFSharpPipelineDirectBody = this.state.inFSharpPipelineDirectBody;
|
|
this.state.maybeInArrowParameters = true;
|
|
this.state.yieldPos = 0;
|
|
this.state.awaitPos = 0;
|
|
this.state.inFSharpPipelineDirectBody = false;
|
|
|
|
const innerStartPos = this.state.start;
|
|
const innerStartLoc = this.state.startLoc;
|
|
const exprList = [];
|
|
const refShorthandDefaultPos = { start: 0 };
|
|
const refNeedsArrowPos = { start: 0 };
|
|
let first = true;
|
|
let spreadStart;
|
|
let optionalCommaStart;
|
|
|
|
while (!this.match(tt.parenR)) {
|
|
if (first) {
|
|
first = false;
|
|
} else {
|
|
this.expect(tt.comma, refNeedsArrowPos.start || null);
|
|
if (this.match(tt.parenR)) {
|
|
optionalCommaStart = this.state.start;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (this.match(tt.ellipsis)) {
|
|
const spreadNodeStartPos = this.state.start;
|
|
const spreadNodeStartLoc = this.state.startLoc;
|
|
spreadStart = this.state.start;
|
|
exprList.push(
|
|
this.parseParenItem(
|
|
this.parseRestBinding(),
|
|
spreadNodeStartPos,
|
|
spreadNodeStartLoc,
|
|
),
|
|
);
|
|
|
|
this.checkCommaAfterRest();
|
|
|
|
break;
|
|
} else {
|
|
exprList.push(
|
|
this.parseMaybeAssign(
|
|
false,
|
|
refShorthandDefaultPos,
|
|
this.parseParenItem,
|
|
refNeedsArrowPos,
|
|
),
|
|
);
|
|
}
|
|
}
|
|
|
|
const innerEndPos = this.state.start;
|
|
const innerEndLoc = this.state.startLoc;
|
|
this.expect(tt.parenR);
|
|
|
|
this.state.maybeInArrowParameters = oldMaybeInArrowParameters;
|
|
this.state.inFSharpPipelineDirectBody = oldInFSharpPipelineDirectBody;
|
|
|
|
let arrowNode = this.startNodeAt(startPos, startLoc);
|
|
if (
|
|
canBeArrow &&
|
|
this.shouldParseArrow() &&
|
|
(arrowNode = this.parseArrow(arrowNode))
|
|
) {
|
|
this.checkYieldAwaitInDefaultParams();
|
|
this.state.yieldPos = oldYieldPos;
|
|
this.state.awaitPos = oldAwaitPos;
|
|
for (const param of exprList) {
|
|
if (param.extra && param.extra.parenthesized) {
|
|
this.unexpected(param.extra.parenStart);
|
|
}
|
|
}
|
|
|
|
this.parseArrowExpression(arrowNode, exprList, false);
|
|
return arrowNode;
|
|
}
|
|
|
|
// We keep the old value if it isn't null, for cases like
|
|
// (x = (yield)) => {}
|
|
this.state.yieldPos = oldYieldPos || this.state.yieldPos;
|
|
this.state.awaitPos = oldAwaitPos || this.state.awaitPos;
|
|
|
|
if (!exprList.length) {
|
|
this.unexpected(this.state.lastTokStart);
|
|
}
|
|
if (optionalCommaStart) this.unexpected(optionalCommaStart);
|
|
if (spreadStart) this.unexpected(spreadStart);
|
|
if (refShorthandDefaultPos.start) {
|
|
this.unexpected(refShorthandDefaultPos.start);
|
|
}
|
|
if (refNeedsArrowPos.start) this.unexpected(refNeedsArrowPos.start);
|
|
|
|
this.toReferencedListDeep(exprList, /* isParenthesizedExpr */ true);
|
|
if (exprList.length > 1) {
|
|
val = this.startNodeAt(innerStartPos, innerStartLoc);
|
|
val.expressions = exprList;
|
|
this.finishNodeAt(val, "SequenceExpression", innerEndPos, innerEndLoc);
|
|
} else {
|
|
val = exprList[0];
|
|
}
|
|
|
|
if (!this.options.createParenthesizedExpressions) {
|
|
this.addExtra(val, "parenthesized", true);
|
|
this.addExtra(val, "parenStart", startPos);
|
|
return val;
|
|
}
|
|
|
|
const parenExpression = this.startNodeAt(startPos, startLoc);
|
|
parenExpression.expression = val;
|
|
this.finishNode(parenExpression, "ParenthesizedExpression");
|
|
return parenExpression;
|
|
}
|
|
|
|
shouldParseArrow(): boolean {
|
|
return !this.canInsertSemicolon();
|
|
}
|
|
|
|
parseArrow(node: N.ArrowFunctionExpression): ?N.ArrowFunctionExpression {
|
|
if (this.eat(tt.arrow)) {
|
|
return node;
|
|
}
|
|
}
|
|
|
|
parseParenItem(
|
|
node: N.Expression,
|
|
startPos: number, // eslint-disable-line no-unused-vars
|
|
startLoc: Position, // eslint-disable-line no-unused-vars
|
|
): N.Expression {
|
|
return node;
|
|
}
|
|
|
|
// New's precedence is slightly tricky. It must allow its argument to
|
|
// be a `[]` or dot subscript expression, but not a call — at least,
|
|
// not without wrapping it in parentheses. Thus, it uses the noCalls
|
|
// argument to parseSubscripts to prevent it from consuming the
|
|
// argument list.
|
|
|
|
parseNew(): N.NewExpression | N.MetaProperty {
|
|
const node = this.startNode();
|
|
const meta = this.parseIdentifier(true);
|
|
|
|
if (this.eat(tt.dot)) {
|
|
const metaProp = this.parseMetaProperty(node, meta, "target");
|
|
|
|
if (!this.scope.inNonArrowFunction && !this.state.inClassProperty) {
|
|
let error = "new.target can only be used in functions";
|
|
|
|
if (this.hasPlugin("classProperties")) {
|
|
error += " or class properties";
|
|
}
|
|
|
|
this.raise(metaProp.start, error);
|
|
}
|
|
|
|
return metaProp;
|
|
}
|
|
|
|
node.callee = this.parseNoCallExpr();
|
|
|
|
if (node.callee.type === "Import") {
|
|
this.raise(node.callee.start, "Cannot use new with import(...)");
|
|
} else if (
|
|
node.callee.type === "OptionalMemberExpression" ||
|
|
node.callee.type === "OptionalCallExpression"
|
|
) {
|
|
this.raise(
|
|
this.state.lastTokEnd,
|
|
"constructors in/after an Optional Chain are not allowed",
|
|
);
|
|
} else if (this.eat(tt.questionDot)) {
|
|
this.raise(
|
|
this.state.start,
|
|
"constructors in/after an Optional Chain are not allowed",
|
|
);
|
|
}
|
|
|
|
this.parseNewArguments(node);
|
|
return this.finishNode(node, "NewExpression");
|
|
}
|
|
|
|
parseNewArguments(node: N.NewExpression): void {
|
|
if (this.eat(tt.parenL)) {
|
|
const args = this.parseExprList(tt.parenR);
|
|
this.toReferencedList(args);
|
|
// $FlowFixMe (parseExprList should be all non-null in this case)
|
|
node.arguments = args;
|
|
} else {
|
|
node.arguments = [];
|
|
}
|
|
}
|
|
|
|
// Parse template expression.
|
|
|
|
parseTemplateElement(isTagged: boolean): N.TemplateElement {
|
|
const elem = this.startNode();
|
|
if (this.state.value === null) {
|
|
if (!isTagged) {
|
|
// TODO: fix this
|
|
this.raise(
|
|
this.state.invalidTemplateEscapePosition || 0,
|
|
"Invalid escape sequence in template",
|
|
);
|
|
} else {
|
|
this.state.invalidTemplateEscapePosition = null;
|
|
}
|
|
}
|
|
elem.value = {
|
|
raw: this.input
|
|
.slice(this.state.start, this.state.end)
|
|
.replace(/\r\n?/g, "\n"),
|
|
cooked: this.state.value,
|
|
};
|
|
this.next();
|
|
elem.tail = this.match(tt.backQuote);
|
|
return this.finishNode(elem, "TemplateElement");
|
|
}
|
|
|
|
parseTemplate(isTagged: boolean): N.TemplateLiteral {
|
|
const node = this.startNode();
|
|
this.next();
|
|
node.expressions = [];
|
|
let curElt = this.parseTemplateElement(isTagged);
|
|
node.quasis = [curElt];
|
|
while (!curElt.tail) {
|
|
this.expect(tt.dollarBraceL);
|
|
node.expressions.push(this.parseExpression());
|
|
this.expect(tt.braceR);
|
|
node.quasis.push((curElt = this.parseTemplateElement(isTagged)));
|
|
}
|
|
this.next();
|
|
return this.finishNode(node, "TemplateLiteral");
|
|
}
|
|
|
|
// Parse an object literal or binding pattern.
|
|
|
|
parseObj<T: N.ObjectPattern | N.ObjectExpression>(
|
|
isPattern: boolean,
|
|
refShorthandDefaultPos?: ?Pos,
|
|
): T {
|
|
const propHash: any = Object.create(null);
|
|
let first = true;
|
|
const node = this.startNode();
|
|
|
|
node.properties = [];
|
|
this.next();
|
|
|
|
while (!this.eat(tt.braceR)) {
|
|
if (first) {
|
|
first = false;
|
|
} else {
|
|
this.expect(tt.comma);
|
|
if (this.eat(tt.braceR)) break;
|
|
}
|
|
|
|
const prop = this.parseObjectMember(isPattern, refShorthandDefaultPos);
|
|
// $FlowIgnore RestElement will never be returned if !isPattern
|
|
if (!isPattern) this.checkPropClash(prop, propHash);
|
|
|
|
// $FlowIgnore
|
|
if (prop.shorthand) {
|
|
this.addExtra(prop, "shorthand", true);
|
|
}
|
|
|
|
node.properties.push(prop);
|
|
}
|
|
|
|
return this.finishNode(
|
|
node,
|
|
isPattern ? "ObjectPattern" : "ObjectExpression",
|
|
);
|
|
}
|
|
|
|
isAsyncProp(prop: N.ObjectProperty): boolean {
|
|
return (
|
|
!prop.computed &&
|
|
prop.key.type === "Identifier" &&
|
|
prop.key.name === "async" &&
|
|
(this.match(tt.name) ||
|
|
this.match(tt.num) ||
|
|
this.match(tt.string) ||
|
|
this.match(tt.bracketL) ||
|
|
this.state.type.keyword ||
|
|
this.match(tt.star)) &&
|
|
!this.hasPrecedingLineBreak()
|
|
);
|
|
}
|
|
|
|
parseObjectMember(
|
|
isPattern: boolean,
|
|
refShorthandDefaultPos: ?Pos,
|
|
): N.ObjectMember | N.SpreadElement | N.RestElement {
|
|
let decorators = [];
|
|
if (this.match(tt.at)) {
|
|
if (this.hasPlugin("decorators")) {
|
|
this.raise(
|
|
this.state.start,
|
|
"Stage 2 decorators disallow object literal property decorators",
|
|
);
|
|
} else {
|
|
// we needn't check if decorators (stage 0) plugin is enabled since it's checked by
|
|
// the call to this.parseDecorator
|
|
while (this.match(tt.at)) {
|
|
decorators.push(this.parseDecorator());
|
|
}
|
|
}
|
|
}
|
|
|
|
const prop = this.startNode();
|
|
let isGenerator = false;
|
|
let isAsync = false;
|
|
let startPos;
|
|
let startLoc;
|
|
|
|
if (this.match(tt.ellipsis)) {
|
|
if (decorators.length) this.unexpected();
|
|
if (isPattern) {
|
|
this.next();
|
|
// Don't use parseRestBinding() as we only allow Identifier here.
|
|
prop.argument = this.parseIdentifier();
|
|
this.checkCommaAfterRest();
|
|
return this.finishNode(prop, "RestElement");
|
|
}
|
|
|
|
return this.parseSpread();
|
|
}
|
|
|
|
if (decorators.length) {
|
|
prop.decorators = decorators;
|
|
decorators = [];
|
|
}
|
|
|
|
prop.method = false;
|
|
|
|
if (isPattern || refShorthandDefaultPos) {
|
|
startPos = this.state.start;
|
|
startLoc = this.state.startLoc;
|
|
}
|
|
|
|
if (!isPattern) {
|
|
isGenerator = this.eat(tt.star);
|
|
}
|
|
|
|
const containsEsc = this.state.containsEsc;
|
|
this.parsePropertyName(prop);
|
|
|
|
if (!isPattern && !containsEsc && !isGenerator && this.isAsyncProp(prop)) {
|
|
isAsync = true;
|
|
isGenerator = this.eat(tt.star);
|
|
this.parsePropertyName(prop);
|
|
} else {
|
|
isAsync = false;
|
|
}
|
|
|
|
this.parseObjPropValue(
|
|
prop,
|
|
startPos,
|
|
startLoc,
|
|
isGenerator,
|
|
isAsync,
|
|
isPattern,
|
|
refShorthandDefaultPos,
|
|
containsEsc,
|
|
);
|
|
|
|
return prop;
|
|
}
|
|
|
|
isGetterOrSetterMethod(prop: N.ObjectMethod, isPattern: boolean): boolean {
|
|
return (
|
|
!isPattern &&
|
|
!prop.computed &&
|
|
prop.key.type === "Identifier" &&
|
|
(prop.key.name === "get" || prop.key.name === "set") &&
|
|
(this.match(tt.string) || // get "string"() {}
|
|
this.match(tt.num) || // get 1() {}
|
|
this.match(tt.bracketL) || // get ["string"]() {}
|
|
this.match(tt.name) || // get foo() {}
|
|
!!this.state.type.keyword) // get debugger() {}
|
|
);
|
|
}
|
|
|
|
getGetterSetterExpectedParamCount(
|
|
method: N.ObjectMethod | N.ClassMethod,
|
|
): number {
|
|
return method.kind === "get" ? 0 : 1;
|
|
}
|
|
|
|
// get methods aren't allowed to have any parameters
|
|
// set methods must have exactly 1 parameter which is not a rest parameter
|
|
checkGetterSetterParams(method: N.ObjectMethod | N.ClassMethod): void {
|
|
const paramCount = this.getGetterSetterExpectedParamCount(method);
|
|
const start = method.start;
|
|
if (method.params.length !== paramCount) {
|
|
if (method.kind === "get") {
|
|
this.raise(start, "getter must not have any formal parameters");
|
|
} else {
|
|
this.raise(start, "setter must have exactly one formal parameter");
|
|
}
|
|
}
|
|
|
|
if (
|
|
method.kind === "set" &&
|
|
method.params[method.params.length - 1].type === "RestElement"
|
|
) {
|
|
this.raise(
|
|
start,
|
|
"setter function argument must not be a rest parameter",
|
|
);
|
|
}
|
|
}
|
|
|
|
parseObjectMethod(
|
|
prop: N.ObjectMethod,
|
|
isGenerator: boolean,
|
|
isAsync: boolean,
|
|
isPattern: boolean,
|
|
containsEsc: boolean,
|
|
): ?N.ObjectMethod {
|
|
if (isAsync || isGenerator || this.match(tt.parenL)) {
|
|
if (isPattern) this.unexpected();
|
|
prop.kind = "method";
|
|
prop.method = true;
|
|
return this.parseMethod(
|
|
prop,
|
|
isGenerator,
|
|
isAsync,
|
|
/* isConstructor */ false,
|
|
false,
|
|
"ObjectMethod",
|
|
);
|
|
}
|
|
|
|
if (!containsEsc && this.isGetterOrSetterMethod(prop, isPattern)) {
|
|
if (isGenerator || isAsync) this.unexpected();
|
|
prop.kind = prop.key.name;
|
|
this.parsePropertyName(prop);
|
|
this.parseMethod(
|
|
prop,
|
|
/* isGenerator */ false,
|
|
/* isAsync */ false,
|
|
/* isConstructor */ false,
|
|
false,
|
|
"ObjectMethod",
|
|
);
|
|
this.checkGetterSetterParams(prop);
|
|
return prop;
|
|
}
|
|
}
|
|
|
|
parseObjectProperty(
|
|
prop: N.ObjectProperty,
|
|
startPos: ?number,
|
|
startLoc: ?Position,
|
|
isPattern: boolean,
|
|
refShorthandDefaultPos: ?Pos,
|
|
): ?N.ObjectProperty {
|
|
prop.shorthand = false;
|
|
|
|
if (this.eat(tt.colon)) {
|
|
prop.value = isPattern
|
|
? this.parseMaybeDefault(this.state.start, this.state.startLoc)
|
|
: this.parseMaybeAssign(false, refShorthandDefaultPos);
|
|
|
|
return this.finishNode(prop, "ObjectProperty");
|
|
}
|
|
|
|
if (!prop.computed && prop.key.type === "Identifier") {
|
|
this.checkReservedWord(prop.key.name, prop.key.start, true, true);
|
|
|
|
if (isPattern) {
|
|
prop.value = this.parseMaybeDefault(
|
|
startPos,
|
|
startLoc,
|
|
prop.key.__clone(),
|
|
);
|
|
} else if (this.match(tt.eq) && refShorthandDefaultPos) {
|
|
if (!refShorthandDefaultPos.start) {
|
|
refShorthandDefaultPos.start = this.state.start;
|
|
}
|
|
prop.value = this.parseMaybeDefault(
|
|
startPos,
|
|
startLoc,
|
|
prop.key.__clone(),
|
|
);
|
|
} else {
|
|
prop.value = prop.key.__clone();
|
|
}
|
|
prop.shorthand = true;
|
|
|
|
return this.finishNode(prop, "ObjectProperty");
|
|
}
|
|
}
|
|
|
|
parseObjPropValue(
|
|
prop: any,
|
|
startPos: ?number,
|
|
startLoc: ?Position,
|
|
isGenerator: boolean,
|
|
isAsync: boolean,
|
|
isPattern: boolean,
|
|
refShorthandDefaultPos: ?Pos,
|
|
containsEsc: boolean,
|
|
): void {
|
|
const node =
|
|
this.parseObjectMethod(
|
|
prop,
|
|
isGenerator,
|
|
isAsync,
|
|
isPattern,
|
|
containsEsc,
|
|
) ||
|
|
this.parseObjectProperty(
|
|
prop,
|
|
startPos,
|
|
startLoc,
|
|
isPattern,
|
|
refShorthandDefaultPos,
|
|
);
|
|
|
|
if (!node) this.unexpected();
|
|
|
|
// $FlowFixMe
|
|
return node;
|
|
}
|
|
|
|
parsePropertyName(
|
|
prop: N.ObjectOrClassMember | N.ClassMember | N.TsNamedTypeElementBase,
|
|
): N.Expression | N.Identifier {
|
|
if (this.eat(tt.bracketL)) {
|
|
(prop: $FlowSubtype<N.ObjectOrClassMember>).computed = true;
|
|
prop.key = this.parseMaybeAssign();
|
|
this.expect(tt.bracketR);
|
|
} else {
|
|
const oldInPropertyName = this.state.inPropertyName;
|
|
this.state.inPropertyName = true;
|
|
// We check if it's valid for it to be a private name when we push it.
|
|
(prop: $FlowFixMe).key =
|
|
this.match(tt.num) || this.match(tt.string)
|
|
? this.parseExprAtom()
|
|
: this.parseMaybePrivateName();
|
|
|
|
if (prop.key.type !== "PrivateName") {
|
|
// ClassPrivateProperty is never computed, so we don't assign in that case.
|
|
prop.computed = false;
|
|
}
|
|
|
|
this.state.inPropertyName = oldInPropertyName;
|
|
}
|
|
|
|
return prop.key;
|
|
}
|
|
|
|
// Initialize empty function node.
|
|
|
|
initFunction(node: N.BodilessFunctionOrMethodBase, isAsync: ?boolean): void {
|
|
node.id = null;
|
|
node.generator = false;
|
|
node.async = !!isAsync;
|
|
}
|
|
|
|
// Parse object or class method.
|
|
|
|
parseMethod<T: N.MethodLike>(
|
|
node: T,
|
|
isGenerator: boolean,
|
|
isAsync: boolean,
|
|
isConstructor: boolean,
|
|
allowDirectSuper: boolean,
|
|
type: string,
|
|
inClassScope: boolean = false,
|
|
): T {
|
|
const oldYieldPos = this.state.yieldPos;
|
|
const oldAwaitPos = this.state.awaitPos;
|
|
this.state.yieldPos = 0;
|
|
this.state.awaitPos = 0;
|
|
|
|
this.initFunction(node, isAsync);
|
|
node.generator = !!isGenerator;
|
|
const allowModifiers = isConstructor; // For TypeScript parameter properties
|
|
this.scope.enter(
|
|
functionFlags(isAsync, node.generator) |
|
|
SCOPE_SUPER |
|
|
(inClassScope ? SCOPE_CLASS : 0) |
|
|
(allowDirectSuper ? SCOPE_DIRECT_SUPER : 0),
|
|
);
|
|
this.parseFunctionParams((node: any), allowModifiers);
|
|
this.checkYieldAwaitInDefaultParams();
|
|
this.parseFunctionBodyAndFinish(node, type, true);
|
|
this.scope.exit();
|
|
|
|
this.state.yieldPos = oldYieldPos;
|
|
this.state.awaitPos = oldAwaitPos;
|
|
|
|
return node;
|
|
}
|
|
|
|
// Parse arrow function expression.
|
|
// If the parameters are provided, they will be converted to an
|
|
// assignable list.
|
|
parseArrowExpression(
|
|
node: N.ArrowFunctionExpression,
|
|
params: ?(N.Expression[]),
|
|
isAsync: boolean,
|
|
): N.ArrowFunctionExpression {
|
|
this.scope.enter(functionFlags(isAsync, false) | SCOPE_ARROW);
|
|
this.initFunction(node, isAsync);
|
|
|
|
const oldMaybeInArrowParameters = this.state.maybeInArrowParameters;
|
|
const oldYieldPos = this.state.yieldPos;
|
|
const oldAwaitPos = this.state.awaitPos;
|
|
this.state.maybeInArrowParameters = false;
|
|
this.state.yieldPos = 0;
|
|
this.state.awaitPos = 0;
|
|
|
|
if (params) this.setArrowFunctionParameters(node, params);
|
|
this.parseFunctionBody(node, true);
|
|
|
|
this.scope.exit();
|
|
this.state.maybeInArrowParameters = oldMaybeInArrowParameters;
|
|
this.state.yieldPos = oldYieldPos;
|
|
this.state.awaitPos = oldAwaitPos;
|
|
|
|
return this.finishNode(node, "ArrowFunctionExpression");
|
|
}
|
|
|
|
setArrowFunctionParameters(
|
|
node: N.ArrowFunctionExpression,
|
|
params: N.Expression[],
|
|
): void {
|
|
node.params = this.toAssignableList(
|
|
params,
|
|
true,
|
|
"arrow function parameters",
|
|
);
|
|
}
|
|
|
|
isStrictBody(node: { body: N.BlockStatement }): boolean {
|
|
const isBlockStatement = node.body.type === "BlockStatement";
|
|
|
|
if (isBlockStatement && node.body.directives.length) {
|
|
for (const directive of node.body.directives) {
|
|
if (directive.value.value === "use strict") {
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
parseFunctionBodyAndFinish(
|
|
node: N.BodilessFunctionOrMethodBase,
|
|
type: string,
|
|
isMethod?: boolean = false,
|
|
): void {
|
|
// $FlowIgnore (node is not bodiless if we get here)
|
|
this.parseFunctionBody(node, false, isMethod);
|
|
this.finishNode(node, type);
|
|
}
|
|
|
|
// Parse function body and check parameters.
|
|
parseFunctionBody(
|
|
node: N.Function,
|
|
allowExpression: ?boolean,
|
|
isMethod?: boolean = false,
|
|
): void {
|
|
const isExpression = allowExpression && !this.match(tt.braceL);
|
|
const oldStrict = this.state.strict;
|
|
let useStrict = false;
|
|
|
|
const oldInParameters = this.state.inParameters;
|
|
this.state.inParameters = false;
|
|
|
|
if (isExpression) {
|
|
node.body = this.parseMaybeAssign();
|
|
this.checkParams(node, false, allowExpression);
|
|
} else {
|
|
const nonSimple = !this.isSimpleParamList(node.params);
|
|
if (!oldStrict || nonSimple) {
|
|
useStrict = this.strictDirective(this.state.end);
|
|
// If this is a strict mode function, verify that argument names
|
|
// are not repeated, and it does not try to bind the words `eval`
|
|
// or `arguments`.
|
|
if (useStrict && nonSimple) {
|
|
// This logic is here to align the error location with the estree plugin
|
|
const errorPos =
|
|
// $FlowIgnore
|
|
(node.kind === "method" || node.kind === "constructor") &&
|
|
// $FlowIgnore
|
|
!!node.key
|
|
? node.key.end
|
|
: node.start;
|
|
this.raise(
|
|
errorPos,
|
|
"Illegal 'use strict' directive in function with non-simple parameter list",
|
|
);
|
|
}
|
|
}
|
|
// Start a new scope with regard to labels
|
|
// flag (restore them to their old value afterwards).
|
|
const oldLabels = this.state.labels;
|
|
this.state.labels = [];
|
|
if (useStrict) this.state.strict = true;
|
|
// Add the params to varDeclaredNames to ensure that an error is thrown
|
|
// if a let/const declaration in the function clashes with one of the params.
|
|
this.checkParams(
|
|
node,
|
|
!oldStrict && !useStrict && !allowExpression && !isMethod && !nonSimple,
|
|
allowExpression,
|
|
);
|
|
node.body = this.parseBlock(true, false);
|
|
this.state.labels = oldLabels;
|
|
}
|
|
|
|
this.state.inParameters = oldInParameters;
|
|
// Ensure the function name isn't a forbidden identifier in strict mode, e.g. 'eval'
|
|
if (this.state.strict && node.id) {
|
|
this.checkLVal(node.id, BIND_OUTSIDE, undefined, "function name");
|
|
}
|
|
this.state.strict = oldStrict;
|
|
}
|
|
|
|
isSimpleParamList(
|
|
params: $ReadOnlyArray<N.Pattern | N.TSParameterProperty>,
|
|
): boolean {
|
|
for (let i = 0, len = params.length; i < len; i++) {
|
|
if (params[i].type !== "Identifier") return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
checkParams(
|
|
node: N.Function,
|
|
allowDuplicates: boolean,
|
|
// eslint-disable-next-line no-unused-vars
|
|
isArrowFunction: ?boolean,
|
|
): void {
|
|
// $FlowIssue
|
|
const nameHash: {} = Object.create(null);
|
|
for (let i = 0; i < node.params.length; i++) {
|
|
this.checkLVal(
|
|
node.params[i],
|
|
BIND_VAR,
|
|
allowDuplicates ? null : nameHash,
|
|
"function paramter list",
|
|
);
|
|
}
|
|
}
|
|
|
|
// Parses a comma-separated list of expressions, and returns them as
|
|
// an array. `close` is the token type that ends the list, and
|
|
// `allowEmpty` can be turned on to allow subsequent commas with
|
|
// nothing in between them to be parsed as `null` (which is needed
|
|
// for array literals).
|
|
|
|
parseExprList(
|
|
close: TokenType,
|
|
allowEmpty?: boolean,
|
|
refShorthandDefaultPos?: ?Pos,
|
|
): $ReadOnlyArray<?N.Expression> {
|
|
const elts = [];
|
|
let first = true;
|
|
|
|
while (!this.eat(close)) {
|
|
if (first) {
|
|
first = false;
|
|
} else {
|
|
this.expect(tt.comma);
|
|
if (this.eat(close)) break;
|
|
}
|
|
|
|
elts.push(this.parseExprListItem(allowEmpty, refShorthandDefaultPos));
|
|
}
|
|
return elts;
|
|
}
|
|
|
|
parseExprListItem(
|
|
allowEmpty: ?boolean,
|
|
refShorthandDefaultPos: ?Pos,
|
|
refNeedsArrowPos: ?Pos,
|
|
allowPlaceholder: ?boolean,
|
|
): ?N.Expression {
|
|
let elt;
|
|
if (allowEmpty && this.match(tt.comma)) {
|
|
elt = null;
|
|
} else if (this.match(tt.ellipsis)) {
|
|
const spreadNodeStartPos = this.state.start;
|
|
const spreadNodeStartLoc = this.state.startLoc;
|
|
elt = this.parseParenItem(
|
|
this.parseSpread(refShorthandDefaultPos, refNeedsArrowPos),
|
|
spreadNodeStartPos,
|
|
spreadNodeStartLoc,
|
|
);
|
|
} else if (this.match(tt.question)) {
|
|
this.expectPlugin("partialApplication");
|
|
if (!allowPlaceholder) {
|
|
this.raise(this.state.start, "Unexpected argument placeholder");
|
|
}
|
|
const node = this.startNode();
|
|
this.next();
|
|
elt = this.finishNode(node, "ArgumentPlaceholder");
|
|
} else {
|
|
elt = this.parseMaybeAssign(
|
|
false,
|
|
refShorthandDefaultPos,
|
|
this.parseParenItem,
|
|
refNeedsArrowPos,
|
|
);
|
|
}
|
|
return elt;
|
|
}
|
|
|
|
// Parse the next token as an identifier. If `liberal` is true (used
|
|
// when parsing properties), it will also convert keywords into
|
|
// identifiers.
|
|
|
|
parseIdentifier(liberal?: boolean): N.Identifier {
|
|
const node = this.startNode();
|
|
const name = this.parseIdentifierName(node.start, liberal);
|
|
|
|
return this.createIdentifier(node, name);
|
|
}
|
|
|
|
createIdentifier(node: N.Identifier, name: string): N.Identifier {
|
|
node.name = name;
|
|
node.loc.identifierName = name;
|
|
|
|
return this.finishNode(node, "Identifier");
|
|
}
|
|
|
|
parseIdentifierName(pos: number, liberal?: boolean): string {
|
|
let name: string;
|
|
|
|
if (this.match(tt.name)) {
|
|
name = this.state.value;
|
|
} else if (this.state.type.keyword) {
|
|
name = this.state.type.keyword;
|
|
|
|
// `class` and `function` keywords push new context into this.context.
|
|
// But there is no chance to pop the context if the keyword is consumed
|
|
// as an identifier such as a property name.
|
|
// If the previous token is a dot, this does not apply because the
|
|
// context-managing code already ignored the keyword
|
|
if (
|
|
(name === "class" || name === "function") &&
|
|
(this.state.lastTokEnd !== this.state.lastTokStart + 1 ||
|
|
this.input.charCodeAt(this.state.lastTokStart) !== charCodes.dot)
|
|
) {
|
|
this.state.context.pop();
|
|
}
|
|
} else {
|
|
throw this.unexpected();
|
|
}
|
|
|
|
if (!liberal) {
|
|
this.checkReservedWord(
|
|
name,
|
|
this.state.start,
|
|
!!this.state.type.keyword,
|
|
false,
|
|
);
|
|
}
|
|
|
|
this.next();
|
|
|
|
return name;
|
|
}
|
|
|
|
checkReservedWord(
|
|
word: string,
|
|
startLoc: number,
|
|
checkKeywords: boolean,
|
|
isBinding: boolean,
|
|
): void {
|
|
if (this.scope.inGenerator && word === "yield") {
|
|
this.raise(
|
|
startLoc,
|
|
"Can not use 'yield' as identifier inside a generator",
|
|
);
|
|
}
|
|
|
|
if (this.scope.inAsync && word === "await") {
|
|
this.raise(
|
|
startLoc,
|
|
"Can not use 'await' as identifier inside an async function",
|
|
);
|
|
}
|
|
|
|
if (this.state.inClassProperty && word === "arguments") {
|
|
this.raise(
|
|
startLoc,
|
|
"'arguments' is not allowed in class field initializer",
|
|
);
|
|
}
|
|
if (checkKeywords && isKeyword(word)) {
|
|
this.raise(startLoc, `Unexpected keyword '${word}'`);
|
|
}
|
|
|
|
const reservedTest = !this.state.strict
|
|
? isReservedWord
|
|
: isBinding
|
|
? isStrictBindReservedWord
|
|
: isStrictReservedWord;
|
|
|
|
if (reservedTest(word, this.inModule)) {
|
|
if (!this.scope.inAsync && word === "await") {
|
|
this.raise(
|
|
startLoc,
|
|
"Can not use keyword 'await' outside an async function",
|
|
);
|
|
}
|
|
this.raise(startLoc, `Unexpected reserved word '${word}'`);
|
|
}
|
|
}
|
|
|
|
// Parses await expression inside async function.
|
|
|
|
parseAwait(): N.AwaitExpression {
|
|
if (!this.state.awaitPos) {
|
|
this.state.awaitPos = this.state.start;
|
|
}
|
|
const node = this.startNode();
|
|
|
|
this.next();
|
|
|
|
if (this.state.inParameters) {
|
|
this.raise(
|
|
node.start,
|
|
"await is not allowed in async function parameters",
|
|
);
|
|
}
|
|
if (this.match(tt.star)) {
|
|
this.raise(
|
|
node.start,
|
|
"await* has been removed from the async functions proposal. Use Promise.all() instead.",
|
|
);
|
|
}
|
|
|
|
if (!this.state.soloAwait) {
|
|
node.argument = this.parseMaybeUnary();
|
|
}
|
|
return this.finishNode(node, "AwaitExpression");
|
|
}
|
|
|
|
// Parses yield expression inside generator.
|
|
|
|
parseYield(noIn?: ?boolean): N.YieldExpression {
|
|
if (!this.state.yieldPos) {
|
|
this.state.yieldPos = this.state.start;
|
|
}
|
|
const node = this.startNode();
|
|
|
|
if (this.state.inParameters) {
|
|
this.raise(node.start, "yield is not allowed in generator parameters");
|
|
}
|
|
|
|
this.next();
|
|
if (
|
|
this.match(tt.semi) ||
|
|
(!this.match(tt.star) && !this.state.type.startsExpr) ||
|
|
this.canInsertSemicolon()
|
|
) {
|
|
node.delegate = false;
|
|
node.argument = null;
|
|
} else {
|
|
node.delegate = this.eat(tt.star);
|
|
node.argument = this.parseMaybeAssign(noIn);
|
|
}
|
|
return this.finishNode(node, "YieldExpression");
|
|
}
|
|
|
|
// Validates a pipeline (for any of the pipeline Babylon plugins) at the point
|
|
// of the infix operator `|>`.
|
|
|
|
checkPipelineAtInfixOperator(left: N.Expression, leftStartPos: number) {
|
|
if (this.getPluginOption("pipelineOperator", "proposal") === "smart") {
|
|
if (left.type === "SequenceExpression") {
|
|
// Ensure that the pipeline head is not a comma-delimited
|
|
// sequence expression.
|
|
throw this.raise(
|
|
leftStartPos,
|
|
`Pipeline head should not be a comma-separated sequence expression`,
|
|
);
|
|
}
|
|
}
|
|
}
|
|
|
|
parseSmartPipelineBody(
|
|
childExpression: N.Expression,
|
|
startPos: number,
|
|
startLoc: Position,
|
|
): N.PipelineBody {
|
|
const pipelineStyle = this.checkSmartPipelineBodyStyle(childExpression);
|
|
|
|
this.checkSmartPipelineBodyEarlyErrors(
|
|
childExpression,
|
|
pipelineStyle,
|
|
startPos,
|
|
);
|
|
|
|
return this.parseSmartPipelineBodyInStyle(
|
|
childExpression,
|
|
pipelineStyle,
|
|
startPos,
|
|
startLoc,
|
|
);
|
|
}
|
|
|
|
checkSmartPipelineBodyEarlyErrors(
|
|
childExpression: N.Expression,
|
|
pipelineStyle: N.PipelineStyle,
|
|
startPos: number,
|
|
): void {
|
|
if (this.match(tt.arrow)) {
|
|
// If the following token is invalidly `=>`, then throw a human-friendly error
|
|
// instead of something like 'Unexpected token, expected ";"'.
|
|
throw this.raise(
|
|
this.state.start,
|
|
`Unexpected arrow "=>" after pipeline body; arrow function in pipeline body must be parenthesized`,
|
|
);
|
|
} else if (
|
|
pipelineStyle === "PipelineTopicExpression" &&
|
|
childExpression.type === "SequenceExpression"
|
|
) {
|
|
throw this.raise(
|
|
startPos,
|
|
`Pipeline body may not be a comma-separated sequence expression`,
|
|
);
|
|
}
|
|
}
|
|
|
|
parseSmartPipelineBodyInStyle(
|
|
childExpression: N.Expression,
|
|
pipelineStyle: N.PipelineStyle,
|
|
startPos: number,
|
|
startLoc: Position,
|
|
): N.PipelineBody {
|
|
const bodyNode = this.startNodeAt(startPos, startLoc);
|
|
switch (pipelineStyle) {
|
|
case "PipelineBareFunction":
|
|
bodyNode.callee = childExpression;
|
|
break;
|
|
case "PipelineBareConstructor":
|
|
bodyNode.callee = childExpression.callee;
|
|
break;
|
|
case "PipelineBareAwaitedFunction":
|
|
bodyNode.callee = childExpression.argument;
|
|
break;
|
|
case "PipelineTopicExpression":
|
|
if (!this.topicReferenceWasUsedInCurrentTopicContext()) {
|
|
throw this.raise(
|
|
startPos,
|
|
`Pipeline is in topic style but does not use topic reference`,
|
|
);
|
|
}
|
|
bodyNode.expression = childExpression;
|
|
break;
|
|
default:
|
|
throw this.raise(startPos, `Unknown pipeline style ${pipelineStyle}`);
|
|
}
|
|
return this.finishNode(bodyNode, pipelineStyle);
|
|
}
|
|
|
|
checkSmartPipelineBodyStyle(expression: N.Expression): N.PipelineStyle {
|
|
switch (expression.type) {
|
|
default:
|
|
return this.isSimpleReference(expression)
|
|
? "PipelineBareFunction"
|
|
: "PipelineTopicExpression";
|
|
}
|
|
}
|
|
|
|
isSimpleReference(expression: N.Expression): boolean {
|
|
switch (expression.type) {
|
|
case "MemberExpression":
|
|
return (
|
|
!expression.computed && this.isSimpleReference(expression.object)
|
|
);
|
|
case "Identifier":
|
|
return true;
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
// Enable topic references from outer contexts within smart pipeline bodies.
|
|
// The function modifies the parser's topic-context state to enable or disable
|
|
// the use of topic references with the smartPipelines plugin. They then run a
|
|
// callback, then they reset the parser to the old topic-context state that it
|
|
// had before the function was called.
|
|
|
|
withTopicPermittingContext<T>(callback: () => T): T {
|
|
const outerContextTopicState = this.state.topicContext;
|
|
this.state.topicContext = {
|
|
// Enable the use of the primary topic reference.
|
|
maxNumOfResolvableTopics: 1,
|
|
// Hide the use of any topic references from outer contexts.
|
|
maxTopicIndex: null,
|
|
};
|
|
|
|
try {
|
|
return callback();
|
|
} finally {
|
|
this.state.topicContext = outerContextTopicState;
|
|
}
|
|
}
|
|
|
|
// Disable topic references from outer contexts within syntax constructs
|
|
// such as the bodies of iteration statements.
|
|
// The function modifies the parser's topic-context state to enable or disable
|
|
// the use of topic references with the smartPipelines plugin. They then run a
|
|
// callback, then they reset the parser to the old topic-context state that it
|
|
// had before the function was called.
|
|
|
|
withTopicForbiddingContext<T>(callback: () => T): T {
|
|
const outerContextTopicState = this.state.topicContext;
|
|
this.state.topicContext = {
|
|
// Disable the use of the primary topic reference.
|
|
maxNumOfResolvableTopics: 0,
|
|
// Hide the use of any topic references from outer contexts.
|
|
maxTopicIndex: null,
|
|
};
|
|
|
|
try {
|
|
return callback();
|
|
} finally {
|
|
this.state.topicContext = outerContextTopicState;
|
|
}
|
|
}
|
|
|
|
withSoloAwaitPermittingContext<T>(callback: () => T): T {
|
|
const outerContextSoloAwaitState = this.state.soloAwait;
|
|
this.state.soloAwait = true;
|
|
|
|
try {
|
|
return callback();
|
|
} finally {
|
|
this.state.soloAwait = outerContextSoloAwaitState;
|
|
}
|
|
}
|
|
|
|
// Register the use of a primary topic reference (`#`) within the current
|
|
// topic context.
|
|
registerTopicReference(): void {
|
|
this.state.topicContext.maxTopicIndex = 0;
|
|
}
|
|
|
|
primaryTopicReferenceIsAllowedInCurrentTopicContext(): boolean {
|
|
return this.state.topicContext.maxNumOfResolvableTopics >= 1;
|
|
}
|
|
|
|
topicReferenceWasUsedInCurrentTopicContext(): boolean {
|
|
return (
|
|
this.state.topicContext.maxTopicIndex != null &&
|
|
this.state.topicContext.maxTopicIndex >= 0
|
|
);
|
|
}
|
|
|
|
parseFSharpPipelineBody(prec: number, noIn: ?boolean): N.Expression {
|
|
const startPos = this.state.start;
|
|
const startLoc = this.state.startLoc;
|
|
|
|
this.state.potentialArrowAt = this.state.start;
|
|
const oldInFSharpPipelineDirectBody = this.state.inFSharpPipelineDirectBody;
|
|
this.state.inFSharpPipelineDirectBody = true;
|
|
|
|
const ret = this.parseExprOp(
|
|
this.parseMaybeUnary(),
|
|
startPos,
|
|
startLoc,
|
|
prec,
|
|
noIn,
|
|
);
|
|
|
|
this.state.inFSharpPipelineDirectBody = oldInFSharpPipelineDirectBody;
|
|
|
|
return ret;
|
|
}
|
|
}
|