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Current File : /var/app/eseso/cms/node_modules/javascript-stringify/dist/function.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.FunctionParser = exports.dedentFunction = exports.functionToString = exports.USED_METHOD_KEY = void 0;
const quote_1 = require("./quote");
/**
 * Used in function stringification.
 */
/* istanbul ignore next */
const METHOD_NAMES_ARE_QUOTED = {
    " "() {
        /* Empty. */
    },
}[" "]
    .toString()
    .charAt(0) === '"';
const FUNCTION_PREFIXES = {
    Function: "function ",
    GeneratorFunction: "function* ",
    AsyncFunction: "async function ",
    AsyncGeneratorFunction: "async function* ",
};
const METHOD_PREFIXES = {
    Function: "",
    GeneratorFunction: "*",
    AsyncFunction: "async ",
    AsyncGeneratorFunction: "async *",
};
const TOKENS_PRECEDING_REGEXPS = new Set(("case delete else in instanceof new return throw typeof void " +
    ", ; : + - ! ~ & | ^ * / % < > ? =").split(" "));
/**
 * Track function parser usage.
 */
exports.USED_METHOD_KEY = new WeakSet();
/**
 * Stringify a function.
 */
const functionToString = (fn, space, next, key) => {
    const name = typeof key === "string" ? key : undefined;
    // Track in function parser for object stringify to avoid duplicate output.
    if (name !== undefined)
        exports.USED_METHOD_KEY.add(fn);
    return new FunctionParser(fn, space, next, name).stringify();
};
exports.functionToString = functionToString;
/**
 * Rewrite a stringified function to remove initial indentation.
 */
function dedentFunction(fnString) {
    let found;
    for (const line of fnString.split("\n").slice(1)) {
        const m = /^[\s\t]+/.exec(line);
        if (!m)
            return fnString; // Early exit without indent.
        const [str] = m;
        if (found === undefined)
            found = str;
        else if (str.length < found.length)
            found = str;
    }
    return found ? fnString.split(`\n${found}`).join("\n") : fnString;
}
exports.dedentFunction = dedentFunction;
/**
 * Function parser and stringify.
 */
class FunctionParser {
    constructor(fn, indent, next, key) {
        this.fn = fn;
        this.indent = indent;
        this.next = next;
        this.key = key;
        this.pos = 0;
        this.hadKeyword = false;
        this.fnString = Function.prototype.toString.call(fn);
        this.fnType = fn.constructor.name;
        this.keyQuote = key === undefined ? "" : quote_1.quoteKey(key, next);
        this.keyPrefix =
            key === undefined ? "" : `${this.keyQuote}:${indent ? " " : ""}`;
        this.isMethodCandidate =
            key === undefined ? false : this.fn.name === "" || this.fn.name === key;
    }
    stringify() {
        const value = this.tryParse();
        // If we can't stringify this function, return a void expression; for
        // bonus help with debugging, include the function as a string literal.
        if (!value) {
            return `${this.keyPrefix}void ${this.next(this.fnString)}`;
        }
        return dedentFunction(value);
    }
    getPrefix() {
        if (this.isMethodCandidate && !this.hadKeyword) {
            return METHOD_PREFIXES[this.fnType] + this.keyQuote;
        }
        return this.keyPrefix + FUNCTION_PREFIXES[this.fnType];
    }
    tryParse() {
        if (this.fnString[this.fnString.length - 1] !== "}") {
            // Must be an arrow function.
            return this.keyPrefix + this.fnString;
        }
        // Attempt to remove function prefix.
        if (this.fn.name) {
            const result = this.tryStrippingName();
            if (result)
                return result;
        }
        // Support class expressions.
        const prevPos = this.pos;
        if (this.consumeSyntax() === "class")
            return this.fnString;
        this.pos = prevPos;
        if (this.tryParsePrefixTokens()) {
            const result = this.tryStrippingName();
            if (result)
                return result;
            let offset = this.pos;
            switch (this.consumeSyntax("WORD_LIKE")) {
                case "WORD_LIKE":
                    if (this.isMethodCandidate && !this.hadKeyword) {
                        offset = this.pos;
                    }
                case "()":
                    if (this.fnString.substr(this.pos, 2) === "=>") {
                        return this.keyPrefix + this.fnString;
                    }
                    this.pos = offset;
                case '"':
                case "'":
                case "[]":
                    return this.getPrefix() + this.fnString.substr(this.pos);
            }
        }
    }
    /**
     * Attempt to parse the function from the current position by first stripping
     * the function's name from the front. This is not a fool-proof method on all
     * JavaScript engines, but yields good results on Node.js 4 (and slightly
     * less good results on Node.js 6 and 8).
     */
    tryStrippingName() {
        if (METHOD_NAMES_ARE_QUOTED) {
            // ... then this approach is unnecessary and yields false positives.
            return;
        }
        let start = this.pos;
        const prefix = this.fnString.substr(this.pos, this.fn.name.length);
        if (prefix === this.fn.name) {
            this.pos += prefix.length;
            if (this.consumeSyntax() === "()" &&
                this.consumeSyntax() === "{}" &&
                this.pos === this.fnString.length) {
                // Don't include the function's name if it will be included in the
                // prefix, or if it's invalid as a name in a function expression.
                if (this.isMethodCandidate || !quote_1.isValidVariableName(prefix)) {
                    start += prefix.length;
                }
                return this.getPrefix() + this.fnString.substr(start);
            }
        }
        this.pos = start;
    }
    /**
     * Attempt to advance the parser past the keywords expected to be at the
     * start of this function's definition. This method sets `this.hadKeyword`
     * based on whether or not a `function` keyword is consumed.
     */
    tryParsePrefixTokens() {
        let posPrev = this.pos;
        this.hadKeyword = false;
        switch (this.fnType) {
            case "AsyncFunction":
                if (this.consumeSyntax() !== "async")
                    return false;
                posPrev = this.pos;
            case "Function":
                if (this.consumeSyntax() === "function") {
                    this.hadKeyword = true;
                }
                else {
                    this.pos = posPrev;
                }
                return true;
            case "AsyncGeneratorFunction":
                if (this.consumeSyntax() !== "async")
                    return false;
            case "GeneratorFunction":
                let token = this.consumeSyntax();
                if (token === "function") {
                    token = this.consumeSyntax();
                    this.hadKeyword = true;
                }
                return token === "*";
        }
    }
    /**
     * Advance the parser past one element of JavaScript syntax. This could be a
     * matched pair of delimiters, like braces or parentheses, or an atomic unit
     * like a keyword, variable, or operator. Return a normalized string
     * representation of the element parsed--for example, returns '{}' for a
     * matched pair of braces. Comments and whitespace are skipped.
     *
     * (This isn't a full parser, so the token scanning logic used here is as
     * simple as it can be. As a consequence, some things that are one token in
     * JavaScript, like decimal number literals or most multi-character operators
     * like '&&', are split into more than one token here. However, awareness of
     * some multi-character sequences like '=>' is necessary, so we match the few
     * of them that we care about.)
     */
    consumeSyntax(wordLikeToken) {
        const m = this.consumeMatch(/^(?:([A-Za-z_0-9$\xA0-\uFFFF]+)|=>|\+\+|\-\-|.)/);
        if (!m)
            return;
        const [token, match] = m;
        this.consumeWhitespace();
        if (match)
            return wordLikeToken || match;
        switch (token) {
            case "(":
                return this.consumeSyntaxUntil("(", ")");
            case "[":
                return this.consumeSyntaxUntil("[", "]");
            case "{":
                return this.consumeSyntaxUntil("{", "}");
            case "`":
                return this.consumeTemplate();
            case '"':
                return this.consumeRegExp(/^(?:[^\\"]|\\.)*"/, '"');
            case "'":
                return this.consumeRegExp(/^(?:[^\\']|\\.)*'/, "'");
        }
        return token;
    }
    consumeSyntaxUntil(startToken, endToken) {
        let isRegExpAllowed = true;
        for (;;) {
            const token = this.consumeSyntax();
            if (token === endToken)
                return startToken + endToken;
            if (!token || token === ")" || token === "]" || token === "}")
                return;
            if (token === "/" &&
                isRegExpAllowed &&
                this.consumeMatch(/^(?:\\.|[^\\\/\n[]|\[(?:\\.|[^\]])*\])+\/[a-z]*/)) {
                isRegExpAllowed = false;
                this.consumeWhitespace();
            }
            else {
                isRegExpAllowed = TOKENS_PRECEDING_REGEXPS.has(token);
            }
        }
    }
    consumeMatch(re) {
        const m = re.exec(this.fnString.substr(this.pos));
        if (m)
            this.pos += m[0].length;
        return m;
    }
    /**
     * Advance the parser past an arbitrary regular expression. Return `token`,
     * or the match object of the regexp.
     */
    consumeRegExp(re, token) {
        const m = re.exec(this.fnString.substr(this.pos));
        if (!m)
            return;
        this.pos += m[0].length;
        this.consumeWhitespace();
        return token;
    }
    /**
     * Advance the parser past a template string.
     */
    consumeTemplate() {
        for (;;) {
            this.consumeMatch(/^(?:[^`$\\]|\\.|\$(?!{))*/);
            if (this.fnString[this.pos] === "`") {
                this.pos++;
                this.consumeWhitespace();
                return "`";
            }
            if (this.fnString.substr(this.pos, 2) === "${") {
                this.pos += 2;
                this.consumeWhitespace();
                if (this.consumeSyntaxUntil("{", "}"))
                    continue;
            }
            return;
        }
    }
    /**
     * Advance the parser past any whitespace or comments.
     */
    consumeWhitespace() {
        this.consumeMatch(/^(?:\s|\/\/.*|\/\*[^]*?\*\/)*/);
    }
}
exports.FunctionParser = FunctionParser;
//# sourceMappingURL=function.js.map

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