a4ebe29b3f
* refactor: parseMaybeUnary => parseUnary * refactor: extract shouldExitDescending method * refactor: add parseUpdate * refactor: avoid comparing with hardcoded token value * refactor: add ParseNewOrNewTarget * refactor: add parseCoverCallAndAsyncArrowHead * add parseBind * refactor: polish parseTaggedTemplateExpression interface * refactor: add parseMember method * refactor: add parseSuper method * refactor: add parseAsyncArrowUnaryFunction method * fix: disallow line break before async binding arrow * refactor: simplify tt.name logic * refactor: add parseDo method * refactor: misc * refactor: rename parseObjectMember by parsePropertyDefinition * refactor: unify set/get/async keyword parsing in ObjectMethod * refactor: misc * refactor: add parseArrayLike method * refactor: move fsharp epilogure and prologue inside parseObjectLike * fixup * refactor: rename parseFunctionExpression to parseFunctionOrFunctionSent * refactor: remove redundant logic * refactor: rename parseClassPropertyName by parseClassElementName * refactor: avoid unecessary lookahead when parsing tt._export * fix: export-default-from should support escaped async as export binding * address review comments * parseUnary -> parseMaybeUnary
470 lines
13 KiB
JavaScript
470 lines
13 KiB
JavaScript
// @flow
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import { types as tt, TokenType } from "../tokenizer/types";
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import type Parser from "../parser";
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import type { ExpressionErrors } from "../parser/util";
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import * as N from "../types";
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import type { Position } from "../util/location";
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import { type BindingTypes, BIND_NONE } from "../util/scopeflags";
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import { Errors } from "../parser/error";
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function isSimpleProperty(node: N.Node): boolean {
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return (
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node != null &&
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node.type === "Property" &&
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node.kind === "init" &&
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node.method === false
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);
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}
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export default (superClass: Class<Parser>): Class<Parser> =>
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class extends superClass {
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estreeParseRegExpLiteral({ pattern, flags }: N.RegExpLiteral): N.Node {
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let regex = null;
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try {
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regex = new RegExp(pattern, flags);
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} catch (e) {
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// In environments that don't support these flags value will
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// be null as the regex can't be represented natively.
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}
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const node = this.estreeParseLiteral(regex);
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node.regex = { pattern, flags };
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return node;
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}
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estreeParseBigIntLiteral(value: any): N.Node {
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// https://github.com/estree/estree/blob/master/es2020.md#bigintliteral
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// $FlowIgnore
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const bigInt = typeof BigInt !== "undefined" ? BigInt(value) : null;
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const node = this.estreeParseLiteral(bigInt);
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node.bigint = String(node.value || value);
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return node;
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}
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estreeParseDecimalLiteral(value: any): N.Node {
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// https://github.com/estree/estree/blob/master/experimental/decimal.md
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// $FlowIgnore
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// todo: use BigDecimal when node supports it.
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const decimal = null;
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const node = this.estreeParseLiteral(decimal);
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node.decimal = String(node.value || value);
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return node;
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}
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estreeParseLiteral(value: any): N.Node {
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return this.parseLiteral(value, "Literal");
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}
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directiveToStmt(directive: N.Directive): N.ExpressionStatement {
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const directiveLiteral = directive.value;
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const stmt = this.startNodeAt(directive.start, directive.loc.start);
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const expression = this.startNodeAt(
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directiveLiteral.start,
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directiveLiteral.loc.start,
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);
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expression.value = directiveLiteral.value;
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expression.raw = directiveLiteral.extra.raw;
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stmt.expression = this.finishNodeAt(
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expression,
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"Literal",
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directiveLiteral.end,
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directiveLiteral.loc.end,
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);
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stmt.directive = directiveLiteral.extra.raw.slice(1, -1);
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return this.finishNodeAt(
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stmt,
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"ExpressionStatement",
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directive.end,
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directive.loc.end,
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);
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}
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// ==================================
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// Overrides
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// ==================================
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initFunction(
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node: N.BodilessFunctionOrMethodBase,
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isAsync: ?boolean,
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): void {
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super.initFunction(node, isAsync);
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node.expression = false;
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}
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checkDeclaration(node: N.Pattern | N.ObjectProperty): void {
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if (isSimpleProperty(node)) {
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this.checkDeclaration(((node: any): N.EstreeProperty).value);
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} else {
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super.checkDeclaration(node);
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}
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}
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checkGetterSetterParams(method: N.ObjectMethod | N.ClassMethod): void {
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const prop = ((method: any): N.EstreeProperty | N.EstreeMethodDefinition);
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const paramCount = prop.kind === "get" ? 0 : 1;
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const start = prop.start;
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if (prop.value.params.length !== paramCount) {
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if (method.kind === "get") {
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this.raise(start, Errors.BadGetterArity);
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} else {
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this.raise(start, Errors.BadSetterArity);
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}
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} else if (
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prop.kind === "set" &&
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prop.value.params[0].type === "RestElement"
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) {
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this.raise(start, Errors.BadSetterRestParameter);
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}
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}
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checkLVal(
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expr: N.Expression,
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bindingType: BindingTypes = BIND_NONE,
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checkClashes: ?{ [key: string]: boolean },
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contextDescription: string,
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disallowLetBinding?: boolean,
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): void {
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switch (expr.type) {
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case "ObjectPattern":
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expr.properties.forEach(prop => {
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this.checkLVal(
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prop.type === "Property" ? prop.value : prop,
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bindingType,
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checkClashes,
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"object destructuring pattern",
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disallowLetBinding,
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);
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});
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break;
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default:
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super.checkLVal(
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expr,
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bindingType,
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checkClashes,
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contextDescription,
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disallowLetBinding,
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);
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}
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}
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checkProto(
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prop: N.ObjectMember | N.SpreadElement,
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isRecord: boolean,
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protoRef: { used: boolean },
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refExpressionErrors: ?ExpressionErrors,
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): void {
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// $FlowIgnore: check prop.method and fallback to super method
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if (prop.method) {
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return;
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}
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super.checkProto(prop, isRecord, protoRef, refExpressionErrors);
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}
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isValidDirective(stmt: N.Statement): boolean {
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return (
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stmt.type === "ExpressionStatement" &&
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stmt.expression.type === "Literal" &&
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typeof stmt.expression.value === "string" &&
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!stmt.expression.extra?.parenthesized
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);
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}
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stmtToDirective(stmt: N.Statement): N.Directive {
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const directive = super.stmtToDirective(stmt);
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const value = stmt.expression.value;
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// Reset value to the actual value as in estree mode we want
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// the stmt to have the real value and not the raw value
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directive.value.value = value;
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return directive;
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}
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parseBlockBody(
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node: N.BlockStatementLike,
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allowDirectives: ?boolean,
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topLevel: boolean,
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end: TokenType,
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): void {
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super.parseBlockBody(node, allowDirectives, topLevel, end);
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const directiveStatements = node.directives.map(d =>
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this.directiveToStmt(d),
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);
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node.body = directiveStatements.concat(node.body);
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// $FlowIgnore - directives isn't optional in the type definition
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delete node.directives;
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}
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pushClassMethod(
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classBody: N.ClassBody,
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method: N.ClassMethod,
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isGenerator: boolean,
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isAsync: boolean,
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isConstructor: boolean,
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allowsDirectSuper: boolean,
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): void {
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this.parseMethod(
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method,
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isGenerator,
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isAsync,
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isConstructor,
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allowsDirectSuper,
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"ClassMethod",
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true,
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);
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if (method.typeParameters) {
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// $FlowIgnore
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method.value.typeParameters = method.typeParameters;
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delete method.typeParameters;
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}
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classBody.body.push(method);
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}
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parseExprAtom(refExpressionErrors?: ?ExpressionErrors): N.Expression {
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switch (this.state.type) {
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case tt.num:
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case tt.string:
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return this.estreeParseLiteral(this.state.value);
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case tt.regexp:
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return this.estreeParseRegExpLiteral(this.state.value);
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case tt.bigint:
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return this.estreeParseBigIntLiteral(this.state.value);
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case tt.decimal:
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return this.estreeParseDecimalLiteral(this.state.value);
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case tt._null:
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return this.estreeParseLiteral(null);
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case tt._true:
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return this.estreeParseLiteral(true);
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case tt._false:
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return this.estreeParseLiteral(false);
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default:
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return super.parseExprAtom(refExpressionErrors);
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}
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}
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parseLiteral<T: N.Literal>(
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value: any,
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type: /*T["kind"]*/ string,
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startPos?: number,
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startLoc?: Position,
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): T {
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const node = super.parseLiteral(value, type, startPos, startLoc);
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node.raw = node.extra.raw;
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delete node.extra;
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return node;
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}
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parseFunctionBody(
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node: N.Function,
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allowExpression: ?boolean,
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isMethod?: boolean = false,
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): void {
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super.parseFunctionBody(node, allowExpression, isMethod);
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node.expression = node.body.type !== "BlockStatement";
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}
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parseMethod<T: N.MethodLike>(
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node: T,
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isGenerator: boolean,
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isAsync: boolean,
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isConstructor: boolean,
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allowDirectSuper: boolean,
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type: string,
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inClassScope: boolean = false,
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): T {
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let funcNode = this.startNode();
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funcNode.kind = node.kind; // provide kind, so super method correctly sets state
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funcNode = super.parseMethod(
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funcNode,
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isGenerator,
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isAsync,
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isConstructor,
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allowDirectSuper,
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type,
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inClassScope,
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);
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funcNode.type = "FunctionExpression";
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delete funcNode.kind;
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// $FlowIgnore
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node.value = funcNode;
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type = type === "ClassMethod" ? "MethodDefinition" : type;
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return this.finishNode(node, type);
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}
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parseObjectMethod(
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prop: N.ObjectMethod,
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isGenerator: boolean,
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isAsync: boolean,
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isPattern: boolean,
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isAccessor: boolean,
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): ?N.ObjectMethod {
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const node: N.EstreeProperty = (super.parseObjectMethod(
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prop,
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isGenerator,
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isAsync,
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isPattern,
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isAccessor,
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): any);
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if (node) {
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node.type = "Property";
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if (((node: any): N.ClassMethod).kind === "method") node.kind = "init";
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node.shorthand = false;
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}
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return (node: any);
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}
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parseObjectProperty(
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prop: N.ObjectProperty,
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startPos: ?number,
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startLoc: ?Position,
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isPattern: boolean,
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refExpressionErrors: ?ExpressionErrors,
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): ?N.ObjectProperty {
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const node: N.EstreeProperty = (super.parseObjectProperty(
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prop,
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startPos,
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startLoc,
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isPattern,
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refExpressionErrors,
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): any);
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if (node) {
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node.kind = "init";
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node.type = "Property";
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}
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return (node: any);
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}
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toAssignable(node: N.Node): N.Node {
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if (isSimpleProperty(node)) {
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this.toAssignable(node.value);
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return node;
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}
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return super.toAssignable(node);
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}
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toAssignableObjectExpressionProp(prop: N.Node, isLast: boolean) {
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if (prop.kind === "get" || prop.kind === "set") {
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throw this.raise(prop.key.start, Errors.PatternHasAccessor);
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} else if (prop.method) {
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throw this.raise(prop.key.start, Errors.PatternHasMethod);
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} else {
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super.toAssignableObjectExpressionProp(prop, isLast);
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}
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}
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finishCallExpression<T: N.CallExpression | N.OptionalCallExpression>(
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node: T,
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optional: boolean,
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): N.Expression {
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super.finishCallExpression(node, optional);
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if (node.callee.type === "Import") {
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((node: N.Node): N.EstreeImportExpression).type = "ImportExpression";
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((node: N.Node): N.EstreeImportExpression).source = node.arguments[0];
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// $FlowIgnore - arguments isn't optional in the type definition
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delete node.arguments;
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// $FlowIgnore - callee isn't optional in the type definition
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delete node.callee;
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}
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return node;
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}
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toReferencedListDeep(
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exprList: $ReadOnlyArray<?N.Expression>,
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isParenthesizedExpr?: boolean,
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): void {
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// ImportExpressions do not have an arguments array.
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if (!exprList) {
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return;
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}
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super.toReferencedListDeep(exprList, isParenthesizedExpr);
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}
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parseExport(node: N.Node) {
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super.parseExport(node);
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switch (node.type) {
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case "ExportAllDeclaration":
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node.exported = null;
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break;
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case "ExportNamedDeclaration":
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if (
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node.specifiers.length === 1 &&
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node.specifiers[0].type === "ExportNamespaceSpecifier"
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) {
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node.type = "ExportAllDeclaration";
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node.exported = node.specifiers[0].exported;
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delete node.specifiers;
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}
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break;
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}
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return node;
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}
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parseSubscript(
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base: N.Expression,
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startPos: number,
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startLoc: Position,
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noCalls: ?boolean,
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state: N.ParseSubscriptState,
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) {
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const node = super.parseSubscript(
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base,
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startPos,
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startLoc,
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noCalls,
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state,
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);
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if (state.optionalChainMember) {
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// https://github.com/estree/estree/blob/master/es2020.md#chainexpression
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if (
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node.type === "OptionalMemberExpression" ||
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node.type === "OptionalCallExpression"
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) {
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node.type = node.type.substring(8); // strip Optional prefix
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}
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if (state.stop) {
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const chain = this.startNodeAtNode(node);
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chain.expression = node;
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return this.finishNode(chain, "ChainExpression");
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}
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} else if (
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node.type === "MemberExpression" ||
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node.type === "CallExpression"
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) {
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node.optional = false;
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}
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return node;
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}
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};
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