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Code Editor : espree.cjs

'use strict';

Object.defineProperty(exports, '__esModule', { value: true });

var acorn = require('acorn');
var jsx = require('acorn-jsx');
var visitorKeys = require('eslint-visitor-keys');

function _interopDefaultLegacy (e) { return e && typeof e === 'object' && 'default' in e ? e : { 'default': e }; }

var acorn__namespace = /*#__PURE__*/_interopNamespace(acorn);
var jsx__default = /*#__PURE__*/_interopDefaultLegacy(jsx);
var visitorKeys__namespace = /*#__PURE__*/_interopNamespace(visitorKeys);

/**
 * @fileoverview Translates tokens between Acorn format and Esprima format.
 * @author Nicholas C. Zakas
 */

//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------

// none!

//------------------------------------------------------------------------------
// Private
//------------------------------------------------------------------------------

// Esprima Token Types
const Token = {
    Boolean: "Boolean",
    EOF: "<end>",
    Identifier: "Identifier",
    PrivateIdentifier: "PrivateIdentifier",
    Keyword: "Keyword",
    Null: "Null",
    Numeric: "Numeric",
    Punctuator: "Punctuator",
    String: "String",
    RegularExpression: "RegularExpression",
    Template: "Template",
    JSXIdentifier: "JSXIdentifier",
    JSXText: "JSXText"
};

/**
 * Converts part of a template into an Esprima token.
 * @param {AcornToken[]} tokens The Acorn tokens representing the template.
 * @param {string} code The source code.
 * @returns {EsprimaToken} The Esprima equivalent of the template token.
 * @private
 */
function convertTemplatePart(tokens, code) {
    const firstToken = tokens[0],
        lastTemplateToken = tokens[tokens.length - 1];

const token = {
        type: Token.Template,
        value: code.slice(firstToken.start, lastTemplateToken.end)
    };

if (firstToken.loc) {
        token.loc = {
            start: firstToken.loc.start,
            end: lastTemplateToken.loc.end
        };
    }

if (firstToken.range) {
        token.start = firstToken.range[0];
        token.end = lastTemplateToken.range[1];
        token.range = [token.start, token.end];
    }

return token;
}

/**
 * Contains logic to translate Acorn tokens into Esprima tokens.
 * @param {Object} acornTokTypes The Acorn token types.
 * @param {string} code The source code Acorn is parsing. This is necessary
 *      to correct the "value" property of some tokens.
 * @constructor
 */
function TokenTranslator(acornTokTypes, code) {

// token types
    this._acornTokTypes = acornTokTypes;

// token buffer for templates
    this._tokens = [];

// track the last curly brace
    this._curlyBrace = null;

// the source code
    this._code = code;

}

TokenTranslator.prototype = {
    constructor: TokenTranslator,

/**
     * Translates a single Esprima token to a single Acorn token. This may be
     * inaccurate due to how templates are handled differently in Esprima and
     * Acorn, but should be accurate for all other tokens.
     * @param {AcornToken} token The Acorn token to translate.
     * @param {Object} extra Espree extra object.
     * @returns {EsprimaToken} The Esprima version of the token.
     */
    translate(token, extra) {

const type = token.type,
            tt = this._acornTokTypes;

if (type === tt.name) {
            token.type = Token.Identifier;

// TODO: See if this is an Acorn bug
            if (token.value === "static") {
                token.type = Token.Keyword;
            }

if (extra.ecmaVersion > 5 && (token.value === "yield" || token.value === "let")) {
                token.type = Token.Keyword;
            }

} else if (type === tt.privateId) {
            token.type = Token.PrivateIdentifier;

} else if (type === tt.semi || type === tt.comma ||
                 type === tt.parenL || type === tt.parenR ||
                 type === tt.braceL || type === tt.braceR ||
                 type === tt.dot || type === tt.bracketL ||
                 type === tt.colon || type === tt.question ||
                 type === tt.bracketR || type === tt.ellipsis ||
                 type === tt.arrow || type === tt.jsxTagStart ||
                 type === tt.incDec || type === tt.starstar ||
                 type === tt.jsxTagEnd || type === tt.prefix ||
                 type === tt.questionDot ||
                 (type.binop && !type.keyword) ||
                 type.isAssign) {

token.type = Token.Punctuator;
            token.value = this._code.slice(token.start, token.end);
        } else if (type === tt.jsxName) {
            token.type = Token.JSXIdentifier;
        } else if (type.label === "jsxText" || type === tt.jsxAttrValueToken) {
            token.type = Token.JSXText;
        } else if (type.keyword) {
            if (type.keyword === "true" || type.keyword === "false") {
                token.type = Token.Boolean;
            } else if (type.keyword === "null") {
                token.type = Token.Null;
            } else {
                token.type = Token.Keyword;
            }
        } else if (type === tt.num) {
            token.type = Token.Numeric;
            token.value = this._code.slice(token.start, token.end);
        } else if (type === tt.string) {

if (extra.jsxAttrValueToken) {
                extra.jsxAttrValueToken = false;
                token.type = Token.JSXText;
            } else {
                token.type = Token.String;
            }

token.value = this._code.slice(token.start, token.end);
        } else if (type === tt.regexp) {
            token.type = Token.RegularExpression;
            const value = token.value;

token.regex = {
                flags: value.flags,
                pattern: value.pattern
            };
            token.value = `/${value.pattern}/${value.flags}`;
        }

return token;
    },

/**
     * Function to call during Acorn's onToken handler.
     * @param {AcornToken} token The Acorn token.
     * @param {Object} extra The Espree extra object.
     * @returns {void}
     */
    onToken(token, extra) {

const tt = this._acornTokTypes,
            tokens = extra.tokens,
            templateTokens = this._tokens;

/**
         * Flushes the buffered template tokens and resets the template
         * tracking.
         * @returns {void}
         * @private
         */
        const translateTemplateTokens = () => {
            tokens.push(convertTemplatePart(this._tokens, this._code));
            this._tokens = [];
        };

if (token.type === tt.eof) {

// might be one last curlyBrace
            if (this._curlyBrace) {
                tokens.push(this.translate(this._curlyBrace, extra));
            }

return;
        }

if (token.type === tt.backQuote) {

// if there's already a curly, it's not part of the template
            if (this._curlyBrace) {
                tokens.push(this.translate(this._curlyBrace, extra));
                this._curlyBrace = null;
            }

templateTokens.push(token);

// it's the end
            if (templateTokens.length > 1) {
                translateTemplateTokens();
            }

return;
        }
        if (token.type === tt.dollarBraceL) {
            templateTokens.push(token);
            translateTemplateTokens();
            return;
        }
        if (token.type === tt.braceR) {

// if there's already a curly, it's not part of the template
            if (this._curlyBrace) {
                tokens.push(this.translate(this._curlyBrace, extra));
            }

// store new curly for later
            this._curlyBrace = token;
            return;
        }
        if (token.type === tt.template || token.type === tt.invalidTemplate) {
            if (this._curlyBrace) {
                templateTokens.push(this._curlyBrace);
                this._curlyBrace = null;
            }

templateTokens.push(token);
            return;
        }

if (this._curlyBrace) {
            tokens.push(this.translate(this._curlyBrace, extra));
            this._curlyBrace = null;
        }

tokens.push(this.translate(token, extra));
    }
};

/**
 * @fileoverview A collection of methods for processing Espree's options.
 * @author Kai Cataldo
 */

//------------------------------------------------------------------------------
// Helpers
//------------------------------------------------------------------------------

const SUPPORTED_VERSIONS = [
    3,
    5,
    6, // 2015
    7, // 2016
    8, // 2017
    9, // 2018
    10, // 2019
    11, // 2020
    12, // 2021
    13, // 2022
    14, // 2023
    15 // 2024
];

/**
 * Get the latest ECMAScript version supported by Espree.
 * @returns {number} The latest ECMAScript version.
 */
function getLatestEcmaVersion() {
    return SUPPORTED_VERSIONS[SUPPORTED_VERSIONS.length - 1];
}

/**
 * Get the list of ECMAScript versions supported by Espree.
 * @returns {number[]} An array containing the supported ECMAScript versions.
 */
function getSupportedEcmaVersions() {
    return [...SUPPORTED_VERSIONS];
}

/**
 * Normalize ECMAScript version from the initial config
 * @param {(number|"latest")} 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 = 5) {

let version = ecmaVersion === "latest" ? getLatestEcmaVersion() : ecmaVersion;

if (typeof version !== "number") {
        throw new Error(`ecmaVersion must be a number or "latest". Received value of type ${typeof ecmaVersion} instead.`);
    }

// 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;
    }

if (!SUPPORTED_VERSIONS.includes(version)) {
        throw new Error("Invalid ecmaVersion.");
    }

return version;
}

/**
 * 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;
    }

if (sourceType === "commonjs") {
        return "script";
    }

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 (ecmaVersion !== 3 && options.allowReserved) {

// a value of `false` is intentionally allowed here, so a shared config can overwrite it when needed
        throw new Error("`allowReserved` is only supported when ecmaVersion is 3");
    }
    if (typeof options.allowReserved !== "undefined" && typeof options.allowReserved !== "boolean") {
        throw new Error("`allowReserved`, when present, must be `true` or `false`");
    }
    const allowReserved = ecmaVersion === 3 ? (options.allowReserved || "never") : false;
    const ecmaFeatures = options.ecmaFeatures || {};
    const allowReturnOutsideFunction = options.sourceType === "commonjs" ||
        Boolean(ecmaFeatures.globalReturn);

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,
        allowReserved,
        allowReturnOutsideFunction
    });
}

/* eslint no-param-reassign: 0 -- stylistic choice */

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.
 * @param {string} code The source code being parsed.
 * @returns {Object} The comment object.
 * @private
 */
function convertAcornCommentToEsprimaComment(block, text, start, end, startLoc, endLoc, code) {
    let type;

if (block) {
        type = "Block";
    } else if (code.slice(start, start + 2) === "#!") {
        type = "Hashbang";
    } else {
        type = "Line";
    }

const comment = {
        type,
        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;
}

var espree = () => 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);
            }

// save original source type in case of commonjs
            const originalSourceType = opts.sourceType;
            const options = normalizeOptions(opts);
            const ecmaFeatures = options.ecmaFeatures || {};
            const tokenTranslator =
                options.tokens === true
                    ? new TokenTranslator(tokTypes, code)
                    : null;

/*
             * Data that is unique to Espree and is not represented internally
             * in Acorn.
             *
             * For ES2023 hashbangs, Espree will call `onComment()` during the
             * constructor, so we must define state before having access to
             * `this`.
             */
            const state = {
                originalSourceType: originalSourceType || options.sourceType,
                tokens: tokenTranslator ? [] : null,
                comments: options.comment === true ? [] : null,
                impliedStrict: ecmaFeatures.impliedStrict === true && options.ecmaVersion >= 5,
                ecmaVersion: options.ecmaVersion,
                jsxAttrValueToken: false,
                lastToken: null,
                templateElements: []
            };

// Initialize acorn parser.
            super({

// do not use spread, because we don't want to pass any unknown options to acorn
                ecmaVersion: options.ecmaVersion,
                sourceType: options.sourceType,
                ranges: options.ranges,
                locations: options.locations,
                allowReserved: options.allowReserved,

// Truthy value is true for backward compatibility.
                allowReturnOutsideFunction: options.allowReturnOutsideFunction,

// Collect tokens
                onToken(token) {
                    if (tokenTranslator) {

// Use `tokens`, `ecmaVersion`, and `jsxAttrValueToken` in the state.
                        tokenTranslator.onToken(token, state);
                    }
                    if (token.type !== tokTypes.eof) {
                        state.lastToken = token;
                    }
                },

// Collect comments
                onComment(block, text, start, end, startLoc, endLoc) {
                    if (state.comments) {
                        const comment = convertAcornCommentToEsprimaComment(block, text, start, end, startLoc, endLoc, code);

state.comments.push(comment);
                    }
                }
            }, code);

/*
             * We put all of this data into a symbol property as a way to avoid
             * potential naming conflicts with future versions of Acorn.
             */
            this[STATE] = state;
        }

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 = extra.originalSourceType;

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.body.length) {
                const [firstNode] = program.body;

if (program.range) {
                    program.range[0] = firstNode.range[0];
                }
                if (program.loc) {
                    program.loc.start = firstNode.loc.start;
                }
                program.start = firstNode.start;
            }
            if (extra.lastToken) {
                if (program.range) {
                    program.range[1] = extra.lastToken.range[1];
                }
                if (program.loc) {
                    program.loc.end = extra.lastToken.loc.end;
                }
                program.end = extra.lastToken.end;
            }

/*
             * https://github.com/eslint/espree/issues/349
             * Ensure that template elements have correct range information.
             * This is one location where Acorn produces a different value
             * for its start and end properties vs. the values present in the
             * range property. In order to avoid confusion, we set the start
             * and end properties to the values that are present in range.
             * This is done here, instead of in finishNode(), because Acorn
             * uses the values of start and end internally while parsing, making
             * it dangerous to change those values while parsing is ongoing.
             * By waiting until the end of parsing, we can safely change these
             * values without affect any other part of the process.
             */
            this[STATE].templateElements.forEach(templateElement => {
                const startOffset = -1;
                const endOffset = templateElement.tail ? 1 : 2;

templateElement.start += startOffset;
                templateElement.end += endOffset;

if (templateElement.range) {
                    templateElement.range[0] += startOffset;
                    templateElement.range[1] += endOffset;
                }

if (templateElement.loc) {
                    templateElement.loc.start.column += startOffset;
                    templateElement.loc.end.column += endOffset;
                }
            });

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 -- required by API
            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") {

// save template element references to fix start/end later
                this[STATE].templateElements.push(result);
            }

if (result.type.includes("Function") && !result.generator) {
                result.generator = false;
            }

return result;
        }
    };
};

const version$1 = "9.6.1";

/* eslint-disable jsdoc/no-multi-asterisks -- needed to preserve original formatting of licences */

// To initialize lazily.
const parsers = {
    _regular: null,
    _jsx: null,

get regular() {
        if (this._regular === null) {
            this._regular = acorn__namespace.Parser.extend(espree());
        }
        return this._regular;
    },

get jsx() {
        if (this._jsx === null) {
            this._jsx = acorn__namespace.Parser.extend(jsx__default["default"](), espree());
        }
        return this._jsx;
    },

get(options) {
        const useJsx = Boolean(
            options &&
            options.ecmaFeatures &&
            options.ecmaFeatures.jsx
        );

return useJsx ? this.jsx : this.regular;
    }
};

//------------------------------------------------------------------------------
// Tokenizer
//------------------------------------------------------------------------------

/**
 * Tokenizes the given code.
 * @param {string} code The code to tokenize.
 * @param {Object} options Options defining how to tokenize.
 * @returns {Token[]} An array of tokens.
 * @throws {SyntaxError} If the input code is invalid.
 * @private
 */
function tokenize(code, options) {
    const Parser = parsers.get(options);

// Ensure to collect tokens.
    if (!options || options.tokens !== true) {
        options = Object.assign({}, options, { tokens: true }); // eslint-disable-line no-param-reassign -- stylistic choice
    }

return new Parser(options, code).tokenize();
}

//------------------------------------------------------------------------------
// Parser
//------------------------------------------------------------------------------

/**
 * Parses the given code.
 * @param {string} code The code to tokenize.
 * @param {Object} options Options defining how to tokenize.
 * @returns {ASTNode} The "Program" AST node.
 * @throws {SyntaxError} If the input code is invalid.
 */
function parse(code, options) {
    const Parser = parsers.get(options);

return new Parser(options, code).parse();
}

//------------------------------------------------------------------------------
// Public
//------------------------------------------------------------------------------

const version = version$1;
const name = "espree";

/* istanbul ignore next */
const VisitorKeys = (function() {
    return visitorKeys__namespace.KEYS;
}());

// Derive node types from VisitorKeys
/* istanbul ignore next */
const Syntax = (function() {
    let key,
        types = {};

if (typeof Object.create === "function") {
        types = Object.create(null);
    }

for (key in VisitorKeys) {
        if (Object.hasOwnProperty.call(VisitorKeys, key)) {
            types[key] = key;
        }
    }

if (typeof Object.freeze === "function") {
        Object.freeze(types);
    }

return types;
}());

const latestEcmaVersion = getLatestEcmaVersion();

const supportedEcmaVersions = getSupportedEcmaVersions();

exports.Syntax = Syntax;
exports.VisitorKeys = VisitorKeys;
exports.latestEcmaVersion = latestEcmaVersion;
exports.name = name;
exports.parse = parse;
exports.supportedEcmaVersions = supportedEcmaVersions;
exports.tokenize = tokenize;
exports.version = version;

${this.title}

Code Editor : espree.cjs