// 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 2018-2022 the Deno authors. All rights reserved. MIT license.
import { YAMLError } from "../error.ts";
import * as common from "../utils.ts";
import { DumperState } from "./dumper_state.ts";
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 = {};
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) {
    const string = character.toString(16).toUpperCase();
    let handle;
    let length;
    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, spaces) {
    const ind = common.repeat(" ", spaces), length = string.length;
    let position = 0, next = -1, result = "", line;
    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, level) {
    return `\n${common.repeat(" ", state.indent * level)}`;
}
function testImplicitResolving(state, str) {
    let 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) {
    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) {
    return 0x00020 <= c && c <= 0x00007e || 0x000a1 <= c && c <= 0x00d7ff && c !== 0x2028 && c !== 0x2029 || 0x0e000 <= c && c <= 0x00fffd && c !== 0xfeff || 0x10000 <= c && c <= 0x10ffff;
}
// Simplified test for values allowed after the first character in plain style.
function isPlainSafe(c) {
    // 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) {
    // 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) {
    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, singleLineOnly, indentPerLevel, lineWidth, testAmbiguousType) {
    const shouldTrackWidth = lineWidth !== -1;
    let hasLineBreak = false, hasFoldableLine = false, previousLineBreak = -1, plain = isPlainSafeFirst(string.charCodeAt(0)) && !isWhitespace(string.charCodeAt(string.length - 1));
    let char, i;
    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, width) {
    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) {
    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, width) {
    // 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 = (()=>{
        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], 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) {
    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, indentPerLevel) {
    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, string, level, iskey) {
    state.dump = (()=>{
        if (string.length === 0) {
            return "''";
        }
        if (!state.noCompatMode && DEPRECATED_BOOLEANS_SYNTAX.indexOf(string) !== -1) {
            return `'${string}'`;
        }
        const indent = state.indent * Math.max(1, level); // no 0-indent scalars
        // As indentation gets deeper, let the width decrease monotonically
        // to the lower bound min(state.lineWidth, 40).
        // Note that this implies
        //  state.lineWidth ≤ 40 + state.indent: width is fixed at the lower bound.
        //  state.lineWidth > 40 + state.indent: width decreases until the lower
        //  bound.
        // This behaves better than a constant minimum width which disallows
        // narrower options, or an indent threshold which causes the width
        // to suddenly increase.
        const lineWidth = state.lineWidth === -1 ? -1 : Math.max(Math.min(state.lineWidth, 40), state.lineWidth - indent);
        // Without knowing if keys are implicit/explicit,
        // assume implicit for safety.
        const singleLineOnly = iskey || // No block styles in flow mode.
        state.flowLevel > -1 && level >= state.flowLevel;
        function testAmbiguity(str) {
            return testImplicitResolving(state, str);
        }
        switch(chooseScalarStyle(string, singleLineOnly, state.indent, lineWidth, testAmbiguity)){
            case STYLE_PLAIN:
                return string;
            case STYLE_SINGLE:
                return `'${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 `"${escapeString(string)}"`;
            default:
                throw new YAMLError("impossible error: invalid scalar style");
        }
    })();
}
function writeFlowSequence(state, level, object) {
    let _result = "";
    const _tag = state.tag;
    for(let index = 0, length = object.length; index < length; index += 1){
        // Write only valid elements.
        if (writeNode(state, level, object[index], false, false)) {
            if (index !== 0) _result += `,${!state.condenseFlow ? " " : ""}`;
            _result += state.dump;
        }
    }
    state.tag = _tag;
    state.dump = `[${_result}]`;
}
function writeBlockSequence(state, level, object, compact = false) {
    let _result = "";
    const _tag = state.tag;
    for(let index = 0, length = object.length; index < length; index += 1){
        // Write only valid elements.
        if (writeNode(state, level + 1, object[index], true, true)) {
            if (!compact || index !== 0) {
                _result += generateNextLine(state, level);
            }
            if (state.dump && CHAR_LINE_FEED === state.dump.charCodeAt(0)) {
                _result += "-";
            } else {
                _result += "- ";
            }
            _result += state.dump;
        }
    }
    state.tag = _tag;
    state.dump = _result || "[]"; // Empty sequence if no valid values.
}
function writeFlowMapping(state, level, object) {
    let _result = "";
    const _tag = state.tag, objectKeyList = Object.keys(object);
    let pairBuffer, objectKey, objectValue;
    for(let index = 0, length = objectKeyList.length; index < length; index += 1){
        pairBuffer = state.condenseFlow ? '"' : "";
        if (index !== 0) pairBuffer += ", ";
        objectKey = objectKeyList[index];
        objectValue = object[objectKey];
        if (!writeNode(state, level, objectKey, false, false)) {
            continue; // Skip this pair because of invalid key;
        }
        if (state.dump.length > 1024) pairBuffer += "? ";
        pairBuffer += `${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, level, object, compact = false) {
    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, objectValue, explicitPair;
    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];
        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);
        }
        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, object, explicit = false) {
    const typeList = explicit ? state.explicitTypes : state.implicitTypes;
    let type;
    let style;
    let _result;
    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(object, style);
                } else if (hasOwn(type.represent, style)) {
                    _result = type.represent[style](object, style);
                } else {
                    throw new YAMLError(`!<${type.tag}> tag resolver accepts not "${style}" style`);
                }
                state.dump = _result;
            }
            return true;
        }
    }
    return false;
}
// Serializes `object` and writes it to global `result`.
// Returns true on success, or false on invalid object.
//
function writeNode(state, level, object, block, compact, iskey = false) {
    state.tag = null;
    state.dump = object;
    if (!detectType(state, object, false)) {
        detectType(state, object, true);
    }
    const type = _toString.call(state.dump);
    if (block) {
        block = state.flowLevel < 0 || state.flowLevel > level;
    }
    const objectOrArray = type === "[object Object]" || type === "[object Array]";
    let duplicateIndex = -1;
    let duplicate = false;
    if (objectOrArray) {
        duplicateIndex = state.duplicates.indexOf(object);
        duplicate = duplicateIndex !== -1;
    }
    if (state.tag !== null && state.tag !== "?" || duplicate || state.indent !== 2 && level > 0) {
        compact = false;
    }
    if (duplicate && state.usedDuplicates[duplicateIndex]) {
        state.dump = `*ref_${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}> ${state.dump}`;
        }
    }
    return true;
}
function inspectNode(object, objects, duplicatesIndexes) {
    if (object !== null && typeof object === "object") {
        const index = objects.indexOf(object);
        if (index !== -1) {
            if (duplicatesIndexes.indexOf(index) === -1) {
                duplicatesIndexes.push(index);
            }
        } else {
            objects.push(object);
            if (Array.isArray(object)) {
                for(let idx = 0, length = object.length; idx < length; idx += 1){
                    inspectNode(object[idx], objects, duplicatesIndexes);
                }
            } else {
                const objectKeyList = Object.keys(object);
                for(let idx1 = 0, length1 = objectKeyList.length; idx1 < length1; idx1 += 1){
                    inspectNode(object[objectKeyList[idx1]], objects, duplicatesIndexes);
                }
            }
        }
    }
}
function getDuplicateReferences(object, state) {
    const objects = [], duplicatesIndexes = [];
    inspectNode(object, objects, duplicatesIndexes);
    const length = duplicatesIndexes.length;
    for(let index = 0; index < length; index += 1){
        state.duplicates.push(objects[duplicatesIndexes[index]]);
    }
    state.usedDuplicates = Array.from({
        length
    });
}
export function dump(input, options) {
    options = options || {};
    const state = new DumperState(options);
    if (!state.noRefs) getDuplicateReferences(input, state);
    if (writeNode(state, 0, input, true, true)) return `${state.dump}\n`;
    return "";
}
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