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+// Ported from js-yaml v3.13.1:
+// https://github.com/nodeca/js-yaml/commit/665aadda42349dcae869f12040d9b10ef18d12da
+// Copyright 2011-2015 by Vitaly Puzrin. All rights reserved. MIT license.
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
+
+/* eslint-disable max-len */
+
+import { YAMLError } from "../error.ts";
+import { RepresentFn, StyleVariant, Type } from "../type.ts";
+import * as common from "../utils.ts";
+import { DumperState, DumperStateOptions } from "./dumper_state.ts";
+
+type Any = common.Any;
+type ArrayObject<T = Any> = common.ArrayObject<T>;
+
+const _toString = Object.prototype.toString;
+const _hasOwnProperty = Object.prototype.hasOwnProperty;
+
+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),
+ length = string.length;
+ let position = 0,
+ next = -1,
+ result = "",
+ 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 {
+ let type: Type;
+ for (
+ let index = 0, length = state.implicitTypes.length;
+ index < length;
+ index += 1
+ ) {
+ type = state.implicitTypes[index];
+
+ if (type.resolve(str)) {
+ return true;
+ }
+ }
+
+ return false;
+}
+
+// [33] s-white ::= s-space | s-tab
+function 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,
+ STYLE_SINGLE = 2,
+ STYLE_LITERAL = 3,
+ STYLE_FOLDED = 4,
+ 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,
+ hasFoldableLine = false, // only checked if shouldTrackWidth
+ previousLineBreak = -1, // count the first line correctly
+ plain =
+ isPlainSafeFirst(string.charCodeAt(0)) &&
+ !isWhitespace(string.charCodeAt(string.length - 1));
+
+ let char: number, 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,
+ end,
+ curr = 0,
+ 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;
+ // eslint-disable-next-line @typescript-eslint/no-use-before-define
+ 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],
+ line = match[2];
+ moreIndented = line[0] === " ";
+ result +=
+ prefix +
+ (!prevMoreIndented && !moreIndented && line !== "" ? "\n" : "") +
+ // eslint-disable-next-line @typescript-eslint/no-use-before-define
+ foldLine(line, width);
+ prevMoreIndented = moreIndented;
+ }
+
+ return result;
+}
+
+// Escapes a double-quoted string.
+function escapeString(string: string): string {
+ let result = "";
+ let char, 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
+): void {
+ 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 `"${escapeString(string)}"`;
+ default:
+ throw new YAMLError("impossible error: invalid scalar style");
+ }
+ })();
+}
+
+function writeFlowSequence(
+ state: DumperState,
+ level: number,
+ object: Any
+): void {
+ let _result = "";
+ const _tag = state.tag;
+
+ for (let index = 0, length = object.length; index < length; index += 1) {
+ // Write only valid elements.
+ // eslint-disable-next-line @typescript-eslint/no-use-before-define
+ if (writeNode(state, level, object[index], false, false)) {
+ if (index !== 0) _result += `,${!state.condenseFlow ? " " : ""}`;
+ _result += state.dump;
+ }
+ }
+
+ state.tag = _tag;
+ state.dump = `[${_result}]`;
+}
+
+function writeBlockSequence(
+ state: DumperState,
+ level: number,
+ object: Any,
+ compact = false
+): void {
+ let _result = "";
+ const _tag = state.tag;
+
+ for (let index = 0, length = object.length; index < length; index += 1) {
+ // Write only valid elements.
+ // eslint-disable-next-line @typescript-eslint/no-use-before-define
+ if (writeNode(state, level + 1, object[index], true, true)) {
+ if (!compact || index !== 0) {
+ _result += generateNextLine(state, level);
+ }
+
+ if (state.dump && CHAR_LINE_FEED === state.dump.charCodeAt(0)) {
+ _result += "-";
+ } else {
+ _result += "- ";
+ }
+
+ _result += state.dump;
+ }
+ }
+
+ state.tag = _tag;
+ state.dump = _result || "[]"; // Empty sequence if no valid values.
+}
+
+function writeFlowMapping(
+ state: DumperState,
+ level: number,
+ object: Any
+): void {
+ let _result = "";
+ const _tag = state.tag,
+ objectKeyList = Object.keys(object);
+
+ let pairBuffer: string, objectKey: string, objectValue: Any;
+ for (
+ let index = 0, length = objectKeyList.length;
+ index < length;
+ index += 1
+ ) {
+ pairBuffer = state.condenseFlow ? '"' : "";
+
+ if (index !== 0) pairBuffer += ", ";
+
+ objectKey = objectKeyList[index];
+ objectValue = object[objectKey];
+
+ // eslint-disable-next-line @typescript-eslint/no-use-before-define
+ if (!writeNode(state, level, objectKey, false, false)) {
+ continue; // Skip this pair because of invalid key;
+ }
+
+ if (state.dump.length > 1024) pairBuffer += "? ";
+
+ pairBuffer += `${state.dump}${state.condenseFlow ? '"' : ""}:${
+ state.condenseFlow ? "" : " "
+ }`;
+
+ // eslint-disable-next-line @typescript-eslint/no-use-before-define
+ 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
+): void {
+ const _tag = state.tag,
+ 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");
+ }
+
+ let pairBuffer = "",
+ objectKey: string,
+ objectValue: Any,
+ explicitPair: boolean;
+ for (
+ let index = 0, length = objectKeyList.length;
+ index < length;
+ index += 1
+ ) {
+ pairBuffer = "";
+
+ if (!compact || index !== 0) {
+ pairBuffer += generateNextLine(state, level);
+ }
+
+ objectKey = objectKeyList[index];
+ objectValue = object[objectKey];
+
+ // eslint-disable-next-line @typescript-eslint/no-use-before-define
+ if (!writeNode(state, level + 1, objectKey, true, true, true)) {
+ continue; // Skip this pair because of invalid key.
+ }
+
+ 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);
+ }
+
+ // eslint-disable-next-line @typescript-eslint/no-use-before-define
+ 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;
+
+ let type: Type;
+ let style: StyleVariant;
+ let _result: string;
+ for (let index = 0, length = typeList.length; index < length; index += 1) {
+ type = typeList[index];
+
+ 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) {
+ style = state.styleMap[type.tag] || type.defaultStyle;
+
+ if (_toString.call(type.represent) === "[object Function]") {
+ _result = (type.represent as RepresentFn)(object, style);
+ } else if (_hasOwnProperty.call(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}> ${state.dump}`;
+ }
+ }
+
+ return true;
+}
+
+function inspectNode(
+ object: Any,
+ objects: Any[],
+ duplicatesIndexes: number[]
+): void {
+ if (object !== null && typeof object === "object") {
+ const index = objects.indexOf(object);
+ if (index !== -1) {
+ if (duplicatesIndexes.indexOf(index) === -1) {
+ duplicatesIndexes.push(index);
+ }
+ } else {
+ objects.push(object);
+
+ if (Array.isArray(object)) {
+ for (let idx = 0, length = object.length; idx < length; idx += 1) {
+ inspectNode(object[idx], objects, duplicatesIndexes);
+ }
+ } else {
+ const objectKeyList = Object.keys(object);
+
+ for (
+ let idx = 0, length = objectKeyList.length;
+ idx < length;
+ idx += 1
+ ) {
+ inspectNode(object[objectKeyList[idx]], objects, duplicatesIndexes);
+ }
+ }
+ }
+ }
+}
+
+function getDuplicateReferences(object: object, state: DumperState): void {
+ const objects: Any[] = [],
+ duplicatesIndexes: number[] = [];
+
+ inspectNode(object, objects, duplicatesIndexes);
+
+ const length = duplicatesIndexes.length;
+ for (let index = 0; index < length; index += 1) {
+ state.duplicates.push(objects[duplicatesIndexes[index]]);
+ }
+ state.usedDuplicates = new Array(length);
+}
+
+export function dump(input: Any, options?: DumperStateOptions): string {
+ options = options || {};
+
+ const state = new DumperState(options);
+
+ if (!state.noRefs) getDuplicateReferences(input, state);
+
+ if (writeNode(state, 0, input, true, true)) return `${state.dump}\n`;
+
+ return "";
+}
generated by cgit v1.2.3 (git 2.25.1) at 2025-07-17 09:47:44 +0000