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'use strict';
var Scalar = require('../nodes/Scalar.js');
var foldFlowLines = require('./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.foldFlowLines(str, indent, foldFlowLines.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.foldFlowLines(res, indent, foldFlowLines.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 ]+$/.test(value)) {
return quotedString(value, ctx);
}
const indent = ctx.indent ||
(ctx.forceBlockIndent || containsDocumentMarker(value) ? ' ' : '');
const literal = blockQuote === 'literal'
? true
: blockQuote === 'folded' || type === Scalar.Scalar.BLOCK_FOLDED
? false
: type === Scalar.Scalar.BLOCK_LITERAL
? true
: !lineLengthOverLimit(value, lineWidth, indent.length);
if (!value)
return literal ? '|\n' : '>\n';
// determine chomping from whitespace at value end
let chomp;
let endStart;
for (endStart = value.length; endStart > 0; --endStart) {
const ch = value[endStart - 1];
if (ch !== '\n' && ch !== '\t' && ch !== ' ')
break;
}
let end = value.substring(endStart);
const endNlPos = end.indexOf('\n');
if (endNlPos === -1) {
chomp = '-'; // strip
}
else if (value === end || endNlPos !== end.length - 1) {
chomp = '+'; // keep
if (onChompKeep)
onChompKeep();
}
else {
chomp = ''; // clip
}
if (end) {
value = value.slice(0, -end.length);
if (end[end.length - 1] === '\n')
end = end.slice(0, -1);
end = end.replace(blockEndNewlines, `$&${indent}`);
}
// determine indent indicator from whitespace at value start
let startWithSpace = false;
let startEnd;
let startNlPos = -1;
for (startEnd = 0; startEnd < value.length; ++startEnd) {
const ch = value[startEnd];
if (ch === ' ')
startWithSpace = true;
else if (ch === '\n')
startNlPos = startEnd;
else
break;
}
let start = value.substring(0, startNlPos < startEnd ? startNlPos + 1 : startEnd);
if (start) {
value = value.substring(start.length);
start = start.replace(/\n+/g, `$&${indent}`);
}
const indentSize = indent ? '2' : '1'; // root is at -1
// Leading | or > is added later
let header = (startWithSpace ? indentSize : '') + chomp;
if (comment) {
header += ' ' + commentString(comment.replace(/ ?[\r\n]+/g, ' '));
if (onComment)
onComment();
}
if (!literal) {
const foldedValue = value
.replace(/\n+/g, '\n$&')
.replace(/(?:^|\n)([\t ].*)(?:([\n\t ]*)\n(?![\n\t ]))?/g, '$1$2') // more-indented lines aren't folded
// ^ more-ind. ^ empty ^ capture next empty lines only at end of indent
.replace(/\n+/g, `$&${indent}`);
let literalFallback = false;
const foldOptions = getFoldOptions(ctx, true);
if (blockQuote !== 'folded' && type !== Scalar.Scalar.BLOCK_FOLDED) {
foldOptions.onOverflow = () => {
literalFallback = true;
};
}
const body = foldFlowLines.foldFlowLines(`${start}${foldedValue}${end}`, indent, foldFlowLines.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 (/^[\n\t ,[\]{}#&*!|>'"%@`]|^[?-]$|^[?-][ \t]|[\n:][ \t]|[ \t]\n|[\n\t ]#|[\n\t :]$/.test(value)) {
// not allowed:
// - '-' 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.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.foldFlowLines(str, indent, foldFlowLines.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.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.Scalar.QUOTE_DOUBLE;
}
const _stringify = (_type) => {
switch (_type) {
case Scalar.Scalar.BLOCK_FOLDED:
case Scalar.Scalar.BLOCK_LITERAL:
return implicitKey || inFlow
? quotedString(ss.value, ctx) // blocks are not valid inside flow containers
: blockString(ss, ctx, onComment, onChompKeep);
case Scalar.Scalar.QUOTE_DOUBLE:
return doubleQuotedString(ss.value, ctx);
case Scalar.Scalar.QUOTE_SINGLE:
return singleQuotedString(ss.value, ctx);
case Scalar.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;
}
exports.stringifyString = stringifyString;