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"use strict";
/* eslint-disable no-param-reassign*/
const acorn = require("acorn");
const jsx = require("acorn-jsx");
const TokenTranslator = require("./token-translator");
const DEFAULT_ECMA_VERSION = 5;
const STATE = Symbol("espree's internal state");
const ESPRIMA_FINISH_NODE = Symbol("espree's esprimaFinishNode");
const tokTypes = Object.assign({}, acorn.tokTypes, jsx.tokTypes);
/**
* Normalize ECMAScript version from the initial config
* @param {number} ecmaVersion ECMAScript version from the initial config
* @throws {Error} throws an error if the ecmaVersion is invalid.
* @returns {number} normalized ECMAScript version
*/
function normalizeEcmaVersion(ecmaVersion = DEFAULT_ECMA_VERSION) {
if (typeof ecmaVersion !== "number") {
throw new Error(`ecmaVersion must be a number. Received value of type ${typeof ecmaVersion} instead.`);
}
let version = ecmaVersion;
// Calculate ECMAScript edition number from official year version starting with
// ES2015, which corresponds with ES6 (or a difference of 2009).
if (version >= 2015) {
version -= 2009;
}
switch (version) {
case 3:
case 5:
case 6:
case 7:
case 8:
case 9:
case 10:
case 11:
return version;
// no default
}
throw new Error("Invalid ecmaVersion.");
}
/**
* Normalize sourceType from the initial config
* @param {string} sourceType to normalize
* @throws {Error} throw an error if sourceType is invalid
* @returns {string} normalized sourceType
*/
function normalizeSourceType(sourceType = "script") {
if (sourceType === "script" || sourceType === "module") {
return sourceType;
}
throw new Error("Invalid sourceType.");
}
/**
* Normalize parserOptions
* @param {Object} options the parser options to normalize
* @throws {Error} throw an error if found invalid option.
* @returns {Object} normalized options
*/
function normalizeOptions(options) {
const ecmaVersion = normalizeEcmaVersion(options.ecmaVersion);
const sourceType = normalizeSourceType(options.sourceType);
const ranges = options.range === true;
const locations = options.loc === true;
if (sourceType === "module" && ecmaVersion < 6) {
throw new Error("sourceType 'module' is not supported when ecmaVersion < 2015. Consider adding `{ ecmaVersion: 2015 }` to the parser options.");
}
return Object.assign({}, options, { ecmaVersion, sourceType, ranges, locations });
}
/**
* 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 => 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 = 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;
}
};