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