287 lines
9.5 KiB
JavaScript
287 lines
9.5 KiB
JavaScript
|
"use strict";
|
||
|
|
|
||
|
|
/* eslint-disable no-param-reassign*/
|
||
|
|
const TokenTranslator = require("./token-translator");
|
||
|
|
const { normalizeOptions } = require("./options");
|
||
|
|
|
||
|
|
const STATE = Symbol("espree's internal state");
|
||
|
|
const ESPRIMA_FINISH_NODE = Symbol("espree's esprimaFinishNode");
|
||
|
|
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Converts an Acorn comment to a Esprima comment.
|
||
|
|
* @param {boolean} block True if it's a block comment, false if not.
|
||
|
|
* @param {string} text The text of the comment.
|
||
|
|
* @param {int} start The index at which the comment starts.
|
||
|
|
* @param {int} end The index at which the comment ends.
|
||
|
|
* @param {Location} startLoc The location at which the comment starts.
|
||
|
|
* @param {Location} endLoc The location at which the comment ends.
|
||
|
|
* @returns {Object} The comment object.
|
||
|
|
* @private
|
||
|
|
*/
|
||
|
|
function convertAcornCommentToEsprimaComment(block, text, start, end, startLoc, endLoc) {
|
||
|
|
const comment = {
|
||
|
|
type: block ? "Block" : "Line",
|
||
|
|
value: text
|
||
|
|
};
|
||
|
|
|
||
|
|
if (typeof start === "number") {
|
||
|
|
comment.start = start;
|
||
|
|
comment.end = end;
|
||
|
|
comment.range = [start, end];
|
||
|
|
}
|
||
|
|
|
||
|
|
if (typeof startLoc === "object") {
|
||
|
|
comment.loc = {
|
||
|
|
start: startLoc,
|
||
|
|
end: endLoc
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
return comment;
|
||
|
|
}
|
||
|
|
|
||
|
|
module.exports = () => Parser => {
|
||
|
|
const tokTypes = Object.assign({}, Parser.acorn.tokTypes);
|
||
|
|
|
||
|
|
if (Parser.acornJsx) {
|
||
|
|
Object.assign(tokTypes, Parser.acornJsx.tokTypes);
|
||
|
|
}
|
||
|
|
|
||
|
|
return class Espree extends Parser {
|
||
|
|
constructor(opts, code) {
|
||
|
|
if (typeof opts !== "object" || opts === null) {
|
||
|
|
opts = {};
|
||
|
|
}
|
||
|
|
if (typeof code !== "string" && !(code instanceof String)) {
|
||
|
|
code = String(code);
|
||
|
|
}
|
||
|
|
|
||
|
|
const options = normalizeOptions(opts);
|
||
|
|
const ecmaFeatures = options.ecmaFeatures || {};
|
||
|
|
const tokenTranslator =
|
||
|
|
options.tokens === true
|
||
|
|
? new TokenTranslator(tokTypes, code)
|
||
|
|
: null;
|
||
|
|
|
||
|
|
// Initialize acorn parser.
|
||
|
|
super({
|
||
|
|
|
||
|
|
// TODO: use {...options} when spread is supported(Node.js >= 8.3.0).
|
||
|
|
ecmaVersion: options.ecmaVersion,
|
||
|
|
sourceType: options.sourceType,
|
||
|
|
ranges: options.ranges,
|
||
|
|
locations: options.locations,
|
||
|
|
|
||
|
|
// Truthy value is true for backward compatibility.
|
||
|
|
allowReturnOutsideFunction: Boolean(ecmaFeatures.globalReturn),
|
||
|
|
|
||
|
|
// Collect tokens
|
||
|
|
onToken: token => {
|
||
|
|
if (tokenTranslator) {
|
||
|
|
|
||
|
|
// Use `tokens`, `ecmaVersion`, and `jsxAttrValueToken` in the state.
|
||
|
|
tokenTranslator.onToken(token, this[STATE]);
|
||
|
|
}
|
||
|
|
if (token.type !== tokTypes.eof) {
|
||
|
|
this[STATE].lastToken = token;
|
||
|
|
}
|
||
|
|
},
|
||
|
|
|
||
|
|
// Collect comments
|
||
|
|
onComment: (block, text, start, end, startLoc, endLoc) => {
|
||
|
|
if (this[STATE].comments) {
|
||
|
|
const comment = convertAcornCommentToEsprimaComment(block, text, start, end, startLoc, endLoc);
|
||
|
|
|
||
|
|
this[STATE].comments.push(comment);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}, code);
|
||
|
|
|
||
|
|
// Initialize internal state.
|
||
|
|
this[STATE] = {
|
||
|
|
tokens: tokenTranslator ? [] : null,
|
||
|
|
comments: options.comment === true ? [] : null,
|
||
|
|
impliedStrict: ecmaFeatures.impliedStrict === true && this.options.ecmaVersion >= 5,
|
||
|
|
ecmaVersion: this.options.ecmaVersion,
|
||
|
|
jsxAttrValueToken: false,
|
||
|
|
lastToken: null
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
tokenize() {
|
||
|
|
do {
|
||
|
|
this.next();
|
||
|
|
} while (this.type !== tokTypes.eof);
|
||
|
|
|
||
|
|
// Consume the final eof token
|
||
|
|
this.next();
|
||
|
|
|
||
|
|
const extra = this[STATE];
|
||
|
|
const tokens = extra.tokens;
|
||
|
|
|
||
|
|
if (extra.comments) {
|
||
|
|
tokens.comments = extra.comments;
|
||
|
|
}
|
||
|
|
|
||
|
|
return tokens;
|
||
|
|
}
|
||
|
|
|
||
|
|
finishNode(...args) {
|
||
|
|
const result = super.finishNode(...args);
|
||
|
|
|
||
|
|
return this[ESPRIMA_FINISH_NODE](result);
|
||
|
|
}
|
||
|
|
|
||
|
|
finishNodeAt(...args) {
|
||
|
|
const result = super.finishNodeAt(...args);
|
||
|
|
|
||
|
|
return this[ESPRIMA_FINISH_NODE](result);
|
||
|
|
}
|
||
|
|
|
||
|
|
parse() {
|
||
|
|
const extra = this[STATE];
|
||
|
|
const program = super.parse();
|
||
|
|
|
||
|
|
program.sourceType = this.options.sourceType;
|
||
|
|
|
||
|
|
if (extra.comments) {
|
||
|
|
program.comments = extra.comments;
|
||
|
|
}
|
||
|
|
if (extra.tokens) {
|
||
|
|
program.tokens = extra.tokens;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Adjust opening and closing position of program to match Esprima.
|
||
|
|
* Acorn always starts programs at range 0 whereas Esprima starts at the
|
||
|
|
* first AST node's start (the only real difference is when there's leading
|
||
|
|
* whitespace or leading comments). Acorn also counts trailing whitespace
|
||
|
|
* as part of the program whereas Esprima only counts up to the last token.
|
||
|
|
*/
|
||
|
|
if (program.range) {
|
||
|
|
program.range[0] = program.body.length ? program.body[0].range[0] : program.range[0];
|
||
|
|
program.range[1] = extra.lastToken ? extra.lastToken.range[1] : program.range[1];
|
||
|
|
}
|
||
|
|
if (program.loc) {
|
||
|
|
program.loc.start = program.body.length ? program.body[0].loc.start : program.loc.start;
|
||
|
|
program.loc.end = extra.lastToken ? extra.lastToken.loc.end : program.loc.end;
|
||
|
|
}
|
||
|
|
|
||
|
|
return program;
|
||
|
|
}
|
||
|
|
|
||
|
|
parseTopLevel(node) {
|
||
|
|
if (this[STATE].impliedStrict) {
|
||
|
|
this.strict = true;
|
||
|
|
}
|
||
|
|
return super.parseTopLevel(node);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Overwrites the default raise method to throw Esprima-style errors.
|
||
|
|
* @param {int} pos The position of the error.
|
||
|
|
* @param {string} message The error message.
|
||
|
|
* @throws {SyntaxError} A syntax error.
|
||
|
|
* @returns {void}
|
||
|
|
*/
|
||
|
|
raise(pos, message) {
|
||
|
|
const loc = Parser.acorn.getLineInfo(this.input, pos);
|
||
|
|
const err = new SyntaxError(message);
|
||
|
|
|
||
|
|
err.index = pos;
|
||
|
|
err.lineNumber = loc.line;
|
||
|
|
err.column = loc.column + 1; // acorn uses 0-based columns
|
||
|
|
throw err;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Overwrites the default raise method to throw Esprima-style errors.
|
||
|
|
* @param {int} pos The position of the error.
|
||
|
|
* @param {string} message The error message.
|
||
|
|
* @throws {SyntaxError} A syntax error.
|
||
|
|
* @returns {void}
|
||
|
|
*/
|
||
|
|
raiseRecoverable(pos, message) {
|
||
|
|
this.raise(pos, message);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Overwrites the default unexpected method to throw Esprima-style errors.
|
||
|
|
* @param {int} pos The position of the error.
|
||
|
|
* @throws {SyntaxError} A syntax error.
|
||
|
|
* @returns {void}
|
||
|
|
*/
|
||
|
|
unexpected(pos) {
|
||
|
|
let message = "Unexpected token";
|
||
|
|
|
||
|
|
if (pos !== null && pos !== void 0) {
|
||
|
|
this.pos = pos;
|
||
|
|
|
||
|
|
if (this.options.locations) {
|
||
|
|
while (this.pos < this.lineStart) {
|
||
|
|
this.lineStart = this.input.lastIndexOf("\n", this.lineStart - 2) + 1;
|
||
|
|
--this.curLine;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
this.nextToken();
|
||
|
|
}
|
||
|
|
|
||
|
|
if (this.end > this.start) {
|
||
|
|
message += ` ${this.input.slice(this.start, this.end)}`;
|
||
|
|
}
|
||
|
|
|
||
|
|
this.raise(this.start, message);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Esprima-FB represents JSX strings as tokens called "JSXText", but Acorn-JSX
|
||
|
|
* uses regular tt.string without any distinction between this and regular JS
|
||
|
|
* strings. As such, we intercept an attempt to read a JSX string and set a flag
|
||
|
|
* on extra so that when tokens are converted, the next token will be switched
|
||
|
|
* to JSXText via onToken.
|
||
|
|
*/
|
||
|
|
jsx_readString(quote) { // eslint-disable-line camelcase
|
||
|
|
const result = super.jsx_readString(quote);
|
||
|
|
|
||
|
|
if (this.type === tokTypes.string) {
|
||
|
|
this[STATE].jsxAttrValueToken = true;
|
||
|
|
}
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Performs last-minute Esprima-specific compatibility checks and fixes.
|
||
|
|
* @param {ASTNode} result The node to check.
|
||
|
|
* @returns {ASTNode} The finished node.
|
||
|
|
*/
|
||
|
|
[ESPRIMA_FINISH_NODE](result) {
|
||
|
|
|
||
|
|
// Acorn doesn't count the opening and closing backticks as part of templates
|
||
|
|
// so we have to adjust ranges/locations appropriately.
|
||
|
|
if (result.type === "TemplateElement") {
|
||
|
|
|
||
|
|
// additional adjustment needed if ${ is the last token
|
||
|
|
const terminalDollarBraceL = this.input.slice(result.end, result.end + 2) === "${";
|
||
|
|
|
||
|
|
if (result.range) {
|
||
|
|
result.range[0]--;
|
||
|
|
result.range[1] += (terminalDollarBraceL ? 2 : 1);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (result.loc) {
|
||
|
|
result.loc.start.column--;
|
||
|
|
result.loc.end.column += (terminalDollarBraceL ? 2 : 1);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (result.type.indexOf("Function") > -1 && !result.generator) {
|
||
|
|
result.generator = false;
|
||
|
|
}
|
||
|
|
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
};
|
||
|
|
};
|