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✏️ Editing: stringifyString.js

import { Scalar } from '../nodes/Scalar.js';
import { foldFlowLines, FOLD_QUOTED, FOLD_FLOW, FOLD_BLOCK } from './foldFlowLines.js';

const getFoldOptions = (ctx, isBlock) => ({
    indentAtStart: isBlock ? ctx.indent.length : ctx.indentAtStart,
    lineWidth: ctx.options.lineWidth,
    minContentWidth: ctx.options.minContentWidth
});
// Also checks for lines starting with %, as parsing the output as YAML 1.1 will
// presume that's starting a new document.
const containsDocumentMarker = (str) => /^(%|---|\.\.\.)/m.test(str);
function lineLengthOverLimit(str, lineWidth, indentLength) {
    if (!lineWidth || lineWidth < 0)
        return false;
    const limit = lineWidth - indentLength;
    const strLen = str.length;
    if (strLen <= limit)
        return false;
    for (let i = 0, start = 0; i < strLen; ++i) {
        if (str[i] === '\n') {
            if (i - start > limit)
                return true;
            start = i + 1;
            if (strLen - start <= limit)
                return false;
        }
    }
    return true;
}
function doubleQuotedString(value, ctx) {
    const json = JSON.stringify(value);
    if (ctx.options.doubleQuotedAsJSON)
        return json;
    const { implicitKey } = ctx;
    const minMultiLineLength = ctx.options.doubleQuotedMinMultiLineLength;
    const indent = ctx.indent || (containsDocumentMarker(value) ? '  ' : '');
    let str = '';
    let start = 0;
    for (let i = 0, ch = json[i]; ch; ch = json[++i]) {
        if (ch === ' ' && json[i + 1] === '\\' && json[i + 2] === 'n') {
            // space before newline needs to be escaped to not be folded
            str += json.slice(start, i) + '\\ ';
            i += 1;
            start = i;
            ch = '\\';
        }
        if (ch === '\\')
            switch (json[i + 1]) {
                case 'u':
                    {
                        str += json.slice(start, i);
                        const code = json.substr(i + 2, 4);
                        switch (code) {
                            case '0000':
                                str += '\\0';
                                break;
                            case '0007':
                                str += '\\a';
                                break;
                            case '000b':
                                str += '\\v';
                                break;
                            case '001b':
                                str += '\\e';
                                break;
                            case '0085':
                                str += '\\N';
                                break;
                            case '00a0':
                                str += '\\_';
                                break;
                            case '2028':
                                str += '\\L';
                                break;
                            case '2029':
                                str += '\\P';
                                break;
                            default:
                                if (code.substr(0, 2) === '00')
                                    str += '\\x' + code.substr(2);
                                else
                                    str += json.substr(i, 6);
                        }
                        i += 5;
                        start = i + 1;
                    }
                    break;
                case 'n':
                    if (implicitKey ||
                        json[i + 2] === '"' ||
                        json.length < minMultiLineLength) {
                        i += 1;
                    }
                    else {
                        // folding will eat first newline
                        str += json.slice(start, i) + '\n\n';
                        while (json[i + 2] === '\\' &&
                            json[i + 3] === 'n' &&
                            json[i + 4] !== '"') {
                            str += '\n';
                            i += 2;
                        }
                        str += indent;
                        // space after newline needs to be escaped to not be folded
                        if (json[i + 2] === ' ')
                            str += '\\';
                        i += 1;
                        start = i + 1;
                    }
                    break;
                default:
                    i += 1;
            }
    }
    str = start ? str + json.slice(start) : json;
    return implicitKey
        ? str
        : foldFlowLines(str, indent, FOLD_QUOTED, getFoldOptions(ctx, false));
}
function singleQuotedString(value, ctx) {
    if (ctx.options.singleQuote === false ||
        (ctx.implicitKey && value.includes('\n')) ||
        /[ \t]\n|\n[ \t]/.test(value) // single quoted string can't have leading or trailing whitespace around newline
    )
        return doubleQuotedString(value, ctx);
    const indent = ctx.indent || (containsDocumentMarker(value) ? '  ' : '');
    const res = "'" + value.replace(/'/g, "''").replace(/\n+/g, `$&\n${indent}`) + "'";
    return ctx.implicitKey
        ? res
        : foldFlowLines(res, indent, FOLD_FLOW, getFoldOptions(ctx, false));
}
function quotedString(value, ctx) {
    const { singleQuote } = ctx.options;
    let qs;
    if (singleQuote === false)
        qs = doubleQuotedString;
    else {
        const hasDouble = value.includes('"');
        const hasSingle = value.includes("'");
        if (hasDouble && !hasSingle)
            qs = singleQuotedString;
        else if (hasSingle && !hasDouble)
            qs = doubleQuotedString;
        else
            qs = singleQuote ? singleQuotedString : doubleQuotedString;
    }
    return qs(value, ctx);
}
// The negative lookbehind avoids a polynomial search,
// but isn't supported yet on Safari: https://caniuse.com/js-regexp-lookbehind
let blockEndNewlines;
try {
    blockEndNewlines = new RegExp('(^|(?<!\n))\n+(?!\n|$)', 'g');
}
catch {
    blockEndNewlines = /\n+(?!\n|$)/g;
}
function blockString({ comment, type, value }, ctx, onComment, onChompKeep) {
    const { blockQuote, commentString, lineWidth } = ctx.options;
    // 1. Block can't end in whitespace unless the last line is non-empty.
    // 2. Strings consisting of only whitespace are best rendered explicitly.
    if (!blockQuote || /\n[\t ]+$/.test(value) || /^\s*$/.test(value)) {
        return quotedString(value, ctx);
    }
    const indent = ctx.indent ||
        (ctx.forceBlockIndent || containsDocumentMarker(value) ? '  ' : '');
    const literal = blockQuote === 'literal'
        ? true
        : blockQuote === 'folded' || type === Scalar.BLOCK_FOLDED
            ? false
            : type === Scalar.BLOCK_LITERAL
                ? true
                : !lineLengthOverLimit(value, lineWidth, indent.length);
    if (!value)
        return literal ? '|\n' : '>\n';
    // determine chomping from whitespace at value end
    let chomp;
    let endStart;
    for (endStart = value.length; endStart > 0; --endStart) {
        const ch = value[endStart - 1];
        if (ch !== '\n' && ch !== '\t' && ch !== ' ')
            break;
    }
    let end = value.substring(endStart);
    const endNlPos = end.indexOf('\n');
    if (endNlPos === -1) {
        chomp = '-'; // strip
    }
    else if (value === end || endNlPos !== end.length - 1) {
        chomp = '+'; // keep
        if (onChompKeep)
            onChompKeep();
    }
    else {
        chomp = ''; // clip
    }
    if (end) {
        value = value.slice(0, -end.length);
        if (end[end.length - 1] === '\n')
            end = end.slice(0, -1);
        end = end.replace(blockEndNewlines, `$&${indent}`);
    }
    // determine indent indicator from whitespace at value start
    let startWithSpace = false;
    let startEnd;
    let startNlPos = -1;
    for (startEnd = 0; startEnd < value.length; ++startEnd) {
        const ch = value[startEnd];
        if (ch === ' ')
            startWithSpace = true;
        else if (ch === '\n')
            startNlPos = startEnd;
        else
            break;
    }
    let start = value.substring(0, startNlPos < startEnd ? startNlPos + 1 : startEnd);
    if (start) {
        value = value.substring(start.length);
        start = start.replace(/\n+/g, `$&${indent}`);
    }
    const indentSize = indent ? '2' : '1'; // root is at -1
    // Leading | or > is added later
    let header = (startWithSpace ? indentSize : '') + chomp;
    if (comment) {
        header += ' ' + commentString(comment.replace(/ ?[\r\n]+/g, ' '));
        if (onComment)
            onComment();
    }
    if (!literal) {
        const foldedValue = value
            .replace(/\n+/g, '\n$&')
            .replace(/(?:^|\n)([\t ].*)(?:([\n\t ]*)\n(?![\n\t ]))?/g, '$1$2') // more-indented lines aren't folded
            //                ^ more-ind. ^ empty     ^ capture next empty lines only at end of indent
            .replace(/\n+/g, `$&${indent}`);
        let literalFallback = false;
        const foldOptions = getFoldOptions(ctx, true);
        if (blockQuote !== 'folded' && type !== Scalar.BLOCK_FOLDED) {
            foldOptions.onOverflow = () => {
                literalFallback = true;
            };
        }
        const body = foldFlowLines(`${start}${foldedValue}${end}`, indent, FOLD_BLOCK, foldOptions);
        if (!literalFallback)
            return `>${header}\n${indent}${body}`;
    }
    value = value.replace(/\n+/g, `$&${indent}`);
    return `|${header}\n${indent}${start}${value}${end}`;
}
function plainString(item, ctx, onComment, onChompKeep) {
    const { type, value } = item;
    const { actualString, implicitKey, indent, indentStep, inFlow } = ctx;
    if ((implicitKey && value.includes('\n')) ||
        (inFlow && /[[\]{},]/.test(value))) {
        return quotedString(value, ctx);
    }
    if (!value ||
        /^[\n\t ,[\]{}#&*!|>'"%@`]|^[?-]$|^[?-][ \t]|[\n:][ \t]|[ \t]\n|[\n\t ]#|[\n\t :]$/.test(value)) {
        // not allowed:
        // - empty string, '-' or '?'
        // - start with an indicator character (except [?:-]) or /[?-] /
        // - '\n ', ': ' or ' \n' anywhere
        // - '#' not preceded by a non-space char
        // - end with ' ' or ':'
        return implicitKey || inFlow || !value.includes('\n')
            ? quotedString(value, ctx)
            : blockString(item, ctx, onComment, onChompKeep);
    }
    if (!implicitKey &&
        !inFlow &&
        type !== Scalar.PLAIN &&
        value.includes('\n')) {
        // Where allowed & type not set explicitly, prefer block style for multiline strings
        return blockString(item, ctx, onComment, onChompKeep);
    }
    if (containsDocumentMarker(value)) {
        if (indent === '') {
            ctx.forceBlockIndent = true;
            return blockString(item, ctx, onComment, onChompKeep);
        }
        else if (implicitKey && indent === indentStep) {
            return quotedString(value, ctx);
        }
    }
    const str = value.replace(/\n+/g, `$&\n${indent}`);
    // Verify that output will be parsed as a string, as e.g. plain numbers and
    // booleans get parsed with those types in v1.2 (e.g. '42', 'true' & '0.9e-3'),
    // and others in v1.1.
    if (actualString) {
        const test = (tag) => tag.default && tag.tag !== 'tag:yaml.org,2002:str' && tag.test?.test(str);
        const { compat, tags } = ctx.doc.schema;
        if (tags.some(test) || compat?.some(test))
            return quotedString(value, ctx);
    }
    return implicitKey
        ? str
        : foldFlowLines(str, indent, FOLD_FLOW, getFoldOptions(ctx, false));
}
function stringifyString(item, ctx, onComment, onChompKeep) {
    const { implicitKey, inFlow } = ctx;
    const ss = typeof item.value === 'string'
        ? item
        : Object.assign({}, item, { value: String(item.value) });
    let { type } = item;
    if (type !== Scalar.QUOTE_DOUBLE) {
        // force double quotes on control characters & unpaired surrogates
        if (/[\x00-\x08\x0b-\x1f\x7f-\x9f\u{D800}-\u{DFFF}]/u.test(ss.value))
            type = Scalar.QUOTE_DOUBLE;
    }
    const _stringify = (_type) => {
        switch (_type) {
            case Scalar.BLOCK_FOLDED:
            case Scalar.BLOCK_LITERAL:
                return implicitKey || inFlow
                    ? quotedString(ss.value, ctx) // blocks are not valid inside flow containers
                    : blockString(ss, ctx, onComment, onChompKeep);
            case Scalar.QUOTE_DOUBLE:
                return doubleQuotedString(ss.value, ctx);
            case Scalar.QUOTE_SINGLE:
                return singleQuotedString(ss.value, ctx);
            case Scalar.PLAIN:
                return plainString(ss, ctx, onComment, onChompKeep);
            default:
                return null;
        }
    };
    let res = _stringify(type);
    if (res === null) {
        const { defaultKeyType, defaultStringType } = ctx.options;
        const t = (implicitKey && defaultKeyType) || defaultStringType;
        res = _stringify(t);
        if (res === null)
            throw new Error(`Unsupported default string type ${t}`);
    }
    return res;
}

export { stringifyString };

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