deno.land / std@0.224.0 / yaml / _dumper / dumper.ts
dumper.ts
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import { YAMLError } from "../_error.ts";import type { RepresentFn } from "../type.ts";import * as common from "../_utils.ts";import { DumperState, type DumperStateOptions } from "./dumper_state.ts";
type Any = common.Any;type ArrayObject<T = Any> = common.ArrayObject<T>;
const _toString = Object.prototype.toString;const { hasOwn } = Object;
const CHAR_TAB = 0x09; /* Tab */const CHAR_LINE_FEED = 0x0a; /* LF */const CHAR_SPACE = 0x20; /* Space */const CHAR_EXCLAMATION = 0x21; /* ! */const CHAR_DOUBLE_QUOTE = 0x22; /* " */const CHAR_SHARP = 0x23; /* # */const CHAR_PERCENT = 0x25; /* % */const CHAR_AMPERSAND = 0x26; /* & */const CHAR_SINGLE_QUOTE = 0x27; /* ' */const CHAR_ASTERISK = 0x2a; /* * */const CHAR_COMMA = 0x2c; /* , */const CHAR_MINUS = 0x2d; /* - */const CHAR_COLON = 0x3a; /* : */const CHAR_GREATER_THAN = 0x3e; /* > */const CHAR_QUESTION = 0x3f; /* ? */const CHAR_COMMERCIAL_AT = 0x40; /* @ */const CHAR_LEFT_SQUARE_BRACKET = 0x5b; /* [ */const CHAR_RIGHT_SQUARE_BRACKET = 0x5d; /* ] */const CHAR_GRAVE_ACCENT = 0x60; /* ` */const CHAR_LEFT_CURLY_BRACKET = 0x7b; /* { */const CHAR_VERTICAL_LINE = 0x7c; /* | */const CHAR_RIGHT_CURLY_BRACKET = 0x7d; /* } */
const ESCAPE_SEQUENCES: { [char: number]: string } = {};
ESCAPE_SEQUENCES[0x00] = "\\0";ESCAPE_SEQUENCES[0x07] = "\\a";ESCAPE_SEQUENCES[0x08] = "\\b";ESCAPE_SEQUENCES[0x09] = "\\t";ESCAPE_SEQUENCES[0x0a] = "\\n";ESCAPE_SEQUENCES[0x0b] = "\\v";ESCAPE_SEQUENCES[0x0c] = "\\f";ESCAPE_SEQUENCES[0x0d] = "\\r";ESCAPE_SEQUENCES[0x1b] = "\\e";ESCAPE_SEQUENCES[0x22] = '\\"';ESCAPE_SEQUENCES[0x5c] = "\\\\";ESCAPE_SEQUENCES[0x85] = "\\N";ESCAPE_SEQUENCES[0xa0] = "\\_";ESCAPE_SEQUENCES[0x2028] = "\\L";ESCAPE_SEQUENCES[0x2029] = "\\P";
const DEPRECATED_BOOLEANS_SYNTAX = [ "y", "Y", "yes", "Yes", "YES", "on", "On", "ON", "n", "N", "no", "No", "NO", "off", "Off", "OFF",];
function encodeHex(character: number): string { const string = character.toString(16).toUpperCase();
let handle: string; let length: number; if (character <= 0xff) { handle = "x"; length = 2; } else if (character <= 0xffff) { handle = "u"; length = 4; } else if (character <= 0xffffffff) { handle = "U"; length = 8; } else { throw new YAMLError( "code point within a string may not be greater than 0xFFFFFFFF", ); }
return `\\${handle}${common.repeat("0", length - string.length)}${string}`;}
// Indents every line in a string. Empty lines (\n only) are not indented.function indentString(string: string, spaces: number): string { const ind = common.repeat(" ", spaces); const length = string.length; let position = 0; let next = -1; let result = ""; let line: string;
while (position < length) { next = string.indexOf("\n", position); if (next === -1) { line = string.slice(position); position = length; } else { line = string.slice(position, next + 1); position = next + 1; }
if (line.length && line !== "\n") result += ind;
result += line; }
return result;}
function generateNextLine(state: DumperState, level: number): string { return `\n${common.repeat(" ", state.indent * level)}`;}
function testImplicitResolving(state: DumperState, str: string): boolean { return state.implicitTypes.some((type) => type.resolve(str));}
// [33] s-white ::= s-space | s-tabfunction isWhitespace(c: number): boolean { return c === CHAR_SPACE || c === CHAR_TAB;}
// Returns true if the character can be printed without escaping.// From YAML 1.2: "any allowed characters known to be non-printable// should also be escaped. [However,] This isn’t mandatory"// Derived from nb-char - \t - #x85 - #xA0 - #x2028 - #x2029.function isPrintable(c: number): boolean { return ( (0x00020 <= c && c <= 0x00007e) || (0x000a1 <= c && c <= 0x00d7ff && c !== 0x2028 && c !== 0x2029) || (0x0e000 <= c && c <= 0x00fffd && c !== 0xfeff) /* BOM */ || (0x10000 <= c && c <= 0x10ffff) );}
// Simplified test for values allowed after the first character in plain style.function isPlainSafe(c: number): boolean { // Uses a subset of nb-char - c-flow-indicator - ":" - "#" // where nb-char ::= c-printable - b-char - c-byte-order-mark. return ( isPrintable(c) && c !== 0xfeff && // - c-flow-indicator c !== CHAR_COMMA && c !== CHAR_LEFT_SQUARE_BRACKET && c !== CHAR_RIGHT_SQUARE_BRACKET && c !== CHAR_LEFT_CURLY_BRACKET && c !== CHAR_RIGHT_CURLY_BRACKET && // - ":" - "#" c !== CHAR_COLON && c !== CHAR_SHARP );}
// Simplified test for values allowed as the first character in plain style.function isPlainSafeFirst(c: number): boolean { // Uses a subset of ns-char - c-indicator // where ns-char = nb-char - s-white. return ( isPrintable(c) && c !== 0xfeff && !isWhitespace(c) && // - s-white // - (c-indicator ::= // “-” | “?” | “:” | “,” | “[” | “]” | “{” | “}” c !== CHAR_MINUS && c !== CHAR_QUESTION && c !== CHAR_COLON && c !== CHAR_COMMA && c !== CHAR_LEFT_SQUARE_BRACKET && c !== CHAR_RIGHT_SQUARE_BRACKET && c !== CHAR_LEFT_CURLY_BRACKET && c !== CHAR_RIGHT_CURLY_BRACKET && // | “#” | “&” | “*” | “!” | “|” | “>” | “'” | “"” c !== CHAR_SHARP && c !== CHAR_AMPERSAND && c !== CHAR_ASTERISK && c !== CHAR_EXCLAMATION && c !== CHAR_VERTICAL_LINE && c !== CHAR_GREATER_THAN && c !== CHAR_SINGLE_QUOTE && c !== CHAR_DOUBLE_QUOTE && // | “%” | “@” | “`”) c !== CHAR_PERCENT && c !== CHAR_COMMERCIAL_AT && c !== CHAR_GRAVE_ACCENT );}
// Determines whether block indentation indicator is required.function needIndentIndicator(string: string): boolean { const leadingSpaceRe = /^\n* /; return leadingSpaceRe.test(string);}
const STYLE_PLAIN = 1;const STYLE_SINGLE = 2;const STYLE_LITERAL = 3;const STYLE_FOLDED = 4;const STYLE_DOUBLE = 5;
// Determines which scalar styles are possible and returns the preferred style.// lineWidth = -1 => no limit.// Pre-conditions: str.length > 0.// Post-conditions:// STYLE_PLAIN or STYLE_SINGLE => no \n are in the string.// STYLE_LITERAL => no lines are suitable for folding (or lineWidth is -1).// STYLE_FOLDED => a line > lineWidth and can be folded (and lineWidth !== -1).function chooseScalarStyle( string: string, singleLineOnly: boolean, indentPerLevel: number, lineWidth: number, testAmbiguousType: (...args: Any[]) => Any,): number { const shouldTrackWidth = lineWidth !== -1; let hasLineBreak = false; let hasFoldableLine = false; // only checked if shouldTrackWidth let previousLineBreak = -1; // count the first line correctly let plain = isPlainSafeFirst(string.charCodeAt(0)) && !isWhitespace(string.charCodeAt(string.length - 1));
let char: number; let i: number; if (singleLineOnly) { // Case: no block styles. // Check for disallowed characters to rule out plain and single. for (i = 0; i < string.length; i++) { char = string.charCodeAt(i); if (!isPrintable(char)) { return STYLE_DOUBLE; } plain = plain && isPlainSafe(char); } } else { // Case: block styles permitted. for (i = 0; i < string.length; i++) { char = string.charCodeAt(i); if (char === CHAR_LINE_FEED) { hasLineBreak = true; // Check if any line can be folded. if (shouldTrackWidth) { hasFoldableLine = hasFoldableLine || // Foldable line = too long, and not more-indented. (i - previousLineBreak - 1 > lineWidth && string[previousLineBreak + 1] !== " "); previousLineBreak = i; } } else if (!isPrintable(char)) { return STYLE_DOUBLE; } plain = plain && isPlainSafe(char); } // in case the end is missing a \n hasFoldableLine = hasFoldableLine || (shouldTrackWidth && i - previousLineBreak - 1 > lineWidth && string[previousLineBreak + 1] !== " "); } // Although every style can represent \n without escaping, prefer block styles // for multiline, since they're more readable and they don't add empty lines. // Also prefer folding a super-long line. if (!hasLineBreak && !hasFoldableLine) { // Strings interpretable as another type have to be quoted; // e.g. the string 'true' vs. the boolean true. return plain && !testAmbiguousType(string) ? STYLE_PLAIN : STYLE_SINGLE; } // Edge case: block indentation indicator can only have one digit. if (indentPerLevel > 9 && needIndentIndicator(string)) { return STYLE_DOUBLE; } // At this point we know block styles are valid. // Prefer literal style unless we want to fold. return hasFoldableLine ? STYLE_FOLDED : STYLE_LITERAL;}
// Greedy line breaking.// Picks the longest line under the limit each time,// otherwise settles for the shortest line over the limit.// NB. More-indented lines *cannot* be folded, as that would add an extra \n.function foldLine(line: string, width: number): string { if (line === "" || line[0] === " ") return line;
// Since a more-indented line adds a \n, breaks can't be followed by a space. const breakRe = / [^ ]/g; // note: the match index will always be <= length-2. let match; // start is an inclusive index. end, curr, and next are exclusive. let start = 0; let end; let curr = 0; let next = 0; let result = "";
// Invariants: 0 <= start <= length-1. // 0 <= curr <= next <= max(0, length-2). curr - start <= width. // Inside the loop: // A match implies length >= 2, so curr and next are <= length-2. // tslint:disable-next-line:no-conditional-assignment while ((match = breakRe.exec(line))) { next = match.index; // maintain invariant: curr - start <= width if (next - start > width) { end = curr > start ? curr : next; // derive end <= length-2 result += `\n${line.slice(start, end)}`; // skip the space that was output as \n start = end + 1; // derive start <= length-1 } curr = next; }
// By the invariants, start <= length-1, so there is something left over. // It is either the whole string or a part starting from non-whitespace. result += "\n"; // Insert a break if the remainder is too long and there is a break available. if (line.length - start > width && curr > start) { result += `${line.slice(start, curr)}\n${line.slice(curr + 1)}`; } else { result += line.slice(start); }
return result.slice(1); // drop extra \n joiner}
// (See the note for writeScalar.)function dropEndingNewline(string: string): string { return string[string.length - 1] === "\n" ? string.slice(0, -1) : string;}
// Note: a long line without a suitable break point will exceed the width limit.// Pre-conditions: every char in str isPrintable, str.length > 0, width > 0.function foldString(string: string, width: number): string { // In folded style, $k$ consecutive newlines output as $k+1$ newlines— // unless they're before or after a more-indented line, or at the very // beginning or end, in which case $k$ maps to $k$. // Therefore, parse each chunk as newline(s) followed by a content line. const lineRe = /(\n+)([^\n]*)/g;
// first line (possibly an empty line) let result = ((): string => { let nextLF = string.indexOf("\n"); nextLF = nextLF !== -1 ? nextLF : string.length; lineRe.lastIndex = nextLF; return foldLine(string.slice(0, nextLF), width); })(); // If we haven't reached the first content line yet, don't add an extra \n. let prevMoreIndented = string[0] === "\n" || string[0] === " "; let moreIndented;
// rest of the lines let match; // tslint:disable-next-line:no-conditional-assignment while ((match = lineRe.exec(string))) { const prefix = match[1]; const line = match[2] || ""; moreIndented = line[0] === " "; result += prefix + (!prevMoreIndented && !moreIndented && line !== "" ? "\n" : "") + foldLine(line, width); prevMoreIndented = moreIndented; }
return result;}
// Escapes a double-quoted string.function escapeString(string: string): string { let result = ""; let char; let nextChar; let escapeSeq;
for (let i = 0; i < string.length; i++) { char = string.charCodeAt(i); // Check for surrogate pairs (reference Unicode 3.0 section "3.7 Surrogates"). if (char >= 0xd800 && char <= 0xdbff /* high surrogate */) { nextChar = string.charCodeAt(i + 1); if (nextChar >= 0xdc00 && nextChar <= 0xdfff /* low surrogate */) { // Combine the surrogate pair and store it escaped. result += encodeHex( (char - 0xd800) * 0x400 + nextChar - 0xdc00 + 0x10000, ); // Advance index one extra since we already used that char here. i++; continue; } } escapeSeq = ESCAPE_SEQUENCES[char]; result += !escapeSeq && isPrintable(char) ? string[i] : escapeSeq || encodeHex(char); }
return result;}
// Pre-conditions: string is valid for a block scalar, 1 <= indentPerLevel <= 9.function blockHeader(string: string, indentPerLevel: number): string { const indentIndicator = needIndentIndicator(string) ? String(indentPerLevel) : "";
// note the special case: the string '\n' counts as a "trailing" empty line. const clip = string[string.length - 1] === "\n"; const keep = clip && (string[string.length - 2] === "\n" || string === "\n"); const chomp = keep ? "+" : clip ? "" : "-";
return `${indentIndicator}${chomp}\n`;}
// Note: line breaking/folding is implemented for only the folded style.// NB. We drop the last trailing newline (if any) of a returned block scalar// since the dumper adds its own newline. This always works:// • No ending newline => unaffected; already using strip "-" chomping.// • Ending newline => removed then restored.// Importantly, this keeps the "+" chomp indicator from gaining an extra line.function writeScalar( state: DumperState, string: string, level: number, iskey: boolean,) { state.dump = ((): string => { if (string.length === 0) { return "''"; } if ( !state.noCompatMode && DEPRECATED_BOOLEANS_SYNTAX.indexOf(string) !== -1 ) { return `'${string}'`; }
const indent = state.indent * Math.max(1, level); // no 0-indent scalars // As indentation gets deeper, let the width decrease monotonically // to the lower bound min(state.lineWidth, 40). // Note that this implies // state.lineWidth ≤ 40 + state.indent: width is fixed at the lower bound. // state.lineWidth > 40 + state.indent: width decreases until the lower // bound. // This behaves better than a constant minimum width which disallows // narrower options, or an indent threshold which causes the width // to suddenly increase. const lineWidth = state.lineWidth === -1 ? -1 : Math.max(Math.min(state.lineWidth, 40), state.lineWidth - indent);
// Without knowing if keys are implicit/explicit, // assume implicit for safety. const singleLineOnly = iskey || // No block styles in flow mode. (state.flowLevel > -1 && level >= state.flowLevel); function testAmbiguity(str: string): boolean { return testImplicitResolving(state, str); }
switch ( chooseScalarStyle( string, singleLineOnly, state.indent, lineWidth, testAmbiguity, ) ) { case STYLE_PLAIN: return string; case STYLE_SINGLE: return `'${string.replace(/'/g, "''")}'`; case STYLE_LITERAL: return `|${blockHeader(string, state.indent)}${ dropEndingNewline( indentString(string, indent), ) }`; case STYLE_FOLDED: return `>${blockHeader(string, state.indent)}${ dropEndingNewline( indentString(foldString(string, lineWidth), indent), ) }`; case STYLE_DOUBLE: return `"${escapeString(string)}"`; default: throw new YAMLError("impossible error: invalid scalar style"); } })();}
function writeFlowSequence( state: DumperState, level: number, object: Any,) { let _result = ""; const _tag = state.tag;
for (let index = 0; index < object.length; index += 1) { // Write only valid elements. if (writeNode(state, level, object[index], false, false)) { if (index !== 0) _result += `,${!state.condenseFlow ? " " : ""}`; _result += state.dump; } }
state.tag = _tag; state.dump = `[${_result}]`;}
function writeBlockSequence( state: DumperState, level: number, object: Any, compact = false,) { let _result = ""; const _tag = state.tag;
for (let index = 0; index < object.length; index += 1) { // Write only valid elements. if (writeNode(state, level + 1, object[index], true, true)) { if (!compact || index !== 0) { _result += generateNextLine(state, level); }
if (state.dump && CHAR_LINE_FEED === state.dump.charCodeAt(0)) { _result += "-"; } else { _result += "- "; }
_result += state.dump; } }
state.tag = _tag; state.dump = _result || "[]"; // Empty sequence if no valid values.}
function writeFlowMapping( state: DumperState, level: number, object: Any,) { let _result = ""; const _tag = state.tag; const objectKeyList = Object.keys(object);
for (const [index, objectKey] of objectKeyList.entries()) { let pairBuffer = state.condenseFlow ? '"' : "";
if (index !== 0) pairBuffer += ", ";
const objectValue = object[objectKey];
if (!writeNode(state, level, objectKey, false, false)) { continue; // Skip this pair because of invalid key; }
if (state.dump.length > 1024) pairBuffer += "? ";
pairBuffer += `${state.dump}${state.condenseFlow ? '"' : ""}:${ state.condenseFlow ? "" : " " }`;
if (!writeNode(state, level, objectValue, false, false)) { continue; // Skip this pair because of invalid value. }
pairBuffer += state.dump;
// Both key and value are valid. _result += pairBuffer; }
state.tag = _tag; state.dump = `{${_result}}`;}
function writeBlockMapping( state: DumperState, level: number, object: Any, compact = false,) { const _tag = state.tag; const objectKeyList = Object.keys(object); let _result = "";
// Allow sorting keys so that the output file is deterministic if (state.sortKeys === true) { // Default sorting objectKeyList.sort(); } else if (typeof state.sortKeys === "function") { // Custom sort function objectKeyList.sort(state.sortKeys); } else if (state.sortKeys) { // Something is wrong throw new YAMLError("sortKeys must be a boolean or a function"); }
for (const [index, objectKey] of objectKeyList.entries()) { let pairBuffer = "";
if (!compact || index !== 0) { pairBuffer += generateNextLine(state, level); }
const objectValue = object[objectKey];
if (!writeNode(state, level + 1, objectKey, true, true, true)) { continue; // Skip this pair because of invalid key. }
const explicitPair = (state.tag !== null && state.tag !== "?") || (state.dump && state.dump.length > 1024);
if (explicitPair) { if (state.dump && CHAR_LINE_FEED === state.dump.charCodeAt(0)) { pairBuffer += "?"; } else { pairBuffer += "? "; } }
pairBuffer += state.dump;
if (explicitPair) { pairBuffer += generateNextLine(state, level); }
if (!writeNode(state, level + 1, objectValue, true, explicitPair)) { continue; // Skip this pair because of invalid value. }
if (state.dump && CHAR_LINE_FEED === state.dump.charCodeAt(0)) { pairBuffer += ":"; } else { pairBuffer += ": "; }
pairBuffer += state.dump;
// Both key and value are valid. _result += pairBuffer; }
state.tag = _tag; state.dump = _result || "{}"; // Empty mapping if no valid pairs.}
function detectType( state: DumperState, object: Any, explicit = false,): boolean { const typeList = explicit ? state.explicitTypes : state.implicitTypes;
for (const type of typeList) { let _result: string;
if ( (type.instanceOf || type.predicate) && (!type.instanceOf || (typeof object === "object" && object instanceof type.instanceOf)) && (!type.predicate || type.predicate(object)) ) { state.tag = explicit ? type.tag : "?";
if (type.represent) { const style = state.styleMap[type.tag]! || type.defaultStyle;
if (_toString.call(type.represent) === "[object Function]") { _result = (type.represent as RepresentFn)(object, style); } else if (hasOwn(type.represent, style)) { _result = (type.represent as ArrayObject<RepresentFn>)[style]!( object, style, ); } else { throw new YAMLError( `!<${type.tag}> tag resolver accepts not "${style}" style`, ); }
state.dump = _result; }
return true; } }
return false;}
// Serializes `object` and writes it to global `result`.// Returns true on success, or false on invalid object.//function writeNode( state: DumperState, level: number, object: Any, block: boolean, compact: boolean, iskey = false,): boolean { state.tag = null; state.dump = object;
if (!detectType(state, object, false)) { detectType(state, object, true); }
const type = _toString.call(state.dump);
if (block) { block = state.flowLevel < 0 || state.flowLevel > level; }
const objectOrArray = type === "[object Object]" || type === "[object Array]";
let duplicateIndex = -1; let duplicate = false; if (objectOrArray) { duplicateIndex = state.duplicates.indexOf(object); duplicate = duplicateIndex !== -1; }
if ( (state.tag !== null && state.tag !== "?") || duplicate || (state.indent !== 2 && level > 0) ) { compact = false; }
if (duplicate && state.usedDuplicates[duplicateIndex]) { state.dump = `*ref_${duplicateIndex}`; } else { if (objectOrArray && duplicate && !state.usedDuplicates[duplicateIndex]) { state.usedDuplicates[duplicateIndex] = true; } if (type === "[object Object]") { if (block && Object.keys(state.dump).length !== 0) { writeBlockMapping(state, level, state.dump, compact); if (duplicate) { state.dump = `&ref_${duplicateIndex}${state.dump}`; } } else { writeFlowMapping(state, level, state.dump); if (duplicate) { state.dump = `&ref_${duplicateIndex} ${state.dump}`; } } } else if (type === "[object Array]") { const arrayLevel = state.noArrayIndent && level > 0 ? level - 1 : level; if (block && state.dump.length !== 0) { writeBlockSequence(state, arrayLevel, state.dump, compact); if (duplicate) { state.dump = `&ref_${duplicateIndex}${state.dump}`; } } else { writeFlowSequence(state, arrayLevel, state.dump); if (duplicate) { state.dump = `&ref_${duplicateIndex} ${state.dump}`; } } } else if (type === "[object String]") { if (state.tag !== "?") { writeScalar(state, state.dump, level, iskey); } } else { if (state.skipInvalid) return false; throw new YAMLError(`unacceptable kind of an object to dump ${type}`); }
if (state.tag !== null && state.tag !== "?") { state.dump = `!<${state.tag}> ${state.dump}`; } }
return true;}
function inspectNode( object: Any, objects: Any[], duplicatesIndexes: number[],) { if (object !== null && typeof object === "object") { const index = objects.indexOf(object); if (index !== -1) { if (duplicatesIndexes.indexOf(index) === -1) { duplicatesIndexes.push(index); } } else { objects.push(object);
if (Array.isArray(object)) { for (let idx = 0; idx < object.length; idx += 1) { inspectNode(object[idx], objects, duplicatesIndexes); } } else { for (const objectKey of Object.keys(object)) { inspectNode(object[objectKey], objects, duplicatesIndexes); } } } }}
function getDuplicateReferences( object: Record<string, unknown>, state: DumperState,) { const objects: Any[] = []; const duplicatesIndexes: number[] = [];
inspectNode(object, objects, duplicatesIndexes);
for (const idx of duplicatesIndexes) { state.duplicates.push(objects[idx]); } state.usedDuplicates = Array.from({ length: duplicatesIndexes.length });}
export function dump(input: Any, options?: DumperStateOptions): string { options = options || {};
const state = new DumperState(options);
if (!state.noRefs) getDuplicateReferences(input, state);
if (writeNode(state, 0, input, true, true)) return `${state.dump}\n`;
return "";}
std
Version Info
6 months ago
