432a9b5092
* Allow sourceType:unambiguous as a way to tell Babylon to guess the type. * Update some docs.
127 lines
3.7 KiB
JavaScript
Executable File
127 lines
3.7 KiB
JavaScript
Executable File
// @flow
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import type { Options } from "./options";
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import Parser, { plugins } from "./parser";
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import { types as tokTypes } from "./tokenizer/types";
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import "./tokenizer/context";
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import type { Expression, File } from "./types";
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import estreePlugin from "./plugins/estree";
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import flowPlugin from "./plugins/flow";
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import jsxPlugin from "./plugins/jsx";
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import typescriptPlugin from "./plugins/typescript";
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plugins.estree = estreePlugin;
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plugins.flow = flowPlugin;
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plugins.jsx = jsxPlugin;
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plugins.typescript = typescriptPlugin;
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export function parse(input: string, options?: Options): File {
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if (options && options.sourceType === "unambiguous") {
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options = Object.assign({}, options);
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try {
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options.sourceType = "module";
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const ast = getParser(options, input).parse();
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// Rather than try to parse as a script first, we opt to parse as a module and convert back
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// to a script where possible to avoid having to do a full re-parse of the input content.
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if (!hasModuleSyntax(ast)) ast.program.sourceType = "script";
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return ast;
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} catch (moduleError) {
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try {
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options.sourceType = "script";
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return getParser(options, input).parse();
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} catch (scriptError) {}
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throw moduleError;
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}
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} else {
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return getParser(options, input).parse();
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}
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}
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export function parseExpression(input: string, options?: Options): Expression {
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const parser = getParser(options, input);
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if (parser.options.strictMode) {
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parser.state.strict = true;
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}
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return parser.getExpression();
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}
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export { tokTypes };
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function getParser(options: ?Options, input: string): Parser {
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const cls =
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options && options.plugins ? getParserClass(options.plugins) : Parser;
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return new cls(options, input);
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}
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const parserClassCache: { [key: string]: Class<Parser> } = {};
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/** Get a Parser class with plugins applied. */
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function getParserClass(
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pluginsFromOptions: $ReadOnlyArray<string>,
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): Class<Parser> {
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if (
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pluginsFromOptions.indexOf("decorators") >= 0 &&
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pluginsFromOptions.indexOf("decorators2") >= 0
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) {
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throw new Error("Cannot use decorators and decorators2 plugin together");
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}
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// Filter out just the plugins that have an actual mixin associated with them.
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let pluginList = pluginsFromOptions.filter(
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p => p === "estree" || p === "flow" || p === "jsx" || p === "typescript",
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);
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if (pluginList.indexOf("flow") >= 0) {
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// ensure flow plugin loads last
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pluginList = pluginList.filter(plugin => plugin !== "flow");
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pluginList.push("flow");
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}
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if (
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pluginList.indexOf("flow") >= 0 &&
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pluginList.indexOf("typescript") >= 0
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) {
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throw new Error("Cannot combine flow and typescript plugins.");
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}
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if (pluginList.indexOf("typescript") >= 0) {
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// ensure typescript plugin loads last
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pluginList = pluginList.filter(plugin => plugin !== "typescript");
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pluginList.push("typescript");
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}
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if (pluginList.indexOf("estree") >= 0) {
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// ensure estree plugin loads first
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pluginList = pluginList.filter(plugin => plugin !== "estree");
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pluginList.unshift("estree");
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}
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const key = pluginList.join("/");
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let cls = parserClassCache[key];
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if (!cls) {
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cls = Parser;
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for (const plugin of pluginList) {
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cls = plugins[plugin](cls);
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}
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parserClassCache[key] = cls;
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}
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return cls;
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}
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function hasModuleSyntax(ast) {
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return ast.program.body.some(
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child =>
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(child.type === "ImportDeclaration" &&
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(!child.importKind || child.importKind === "value")) ||
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(child.type === "ExportNamedDeclaration" &&
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(!child.exportKind || child.exportKind === "value")) ||
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(child.type === "ExportAllDeclaration" &&
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(!child.exportKind || child.exportKind === "value")) ||
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child.type === "ExportDefaultDeclaration",
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);
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}
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