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Name	Size	Last Modified
[D]schema/	-	2022-10-02 10:07:49
[D]type/	-	2022-10-02 10:07:52
[F]common.js Edit	1.15 KB	2022-10-02 10:07:42
[F]dumper.js Edit	31.15 KB	2022-10-02 10:07:45
[F]exception.js Edit	1.27 KB	2022-10-02 10:07:46
[F]loader.js Edit	46.04 KB	2022-10-02 10:07:50
[F]schema.js Edit	3.30 KB	2022-10-02 10:07:51
[F]snippet.js Edit	3.02 KB	2022-10-02 10:07:51
[F]type.js Edit	1.81 KB	2022-10-02 10:07:52

Editing: loader.js

'use strict';

/*eslint-disable max-len,no-use-before-define*/

var common              = require('./common');
var YAMLException       = require('./exception');
var makeSnippet         = require('./snippet');
var DEFAULT_SCHEMA      = require('./schema/default');

var _hasOwnProperty = Object.prototype.hasOwnProperty;

var CONTEXT_FLOW_IN   = 1;
var CONTEXT_FLOW_OUT  = 2;
var CONTEXT_BLOCK_IN  = 3;
var CONTEXT_BLOCK_OUT = 4;

var CHOMPING_CLIP  = 1;
var CHOMPING_STRIP = 2;
var CHOMPING_KEEP  = 3;

function _class(obj) { return Object.prototype.toString.call(obj); }

function is_EOL(c) {
  return (c === 0x0A/* LF */) || (c === 0x0D/* CR */);
}

function is_WHITE_SPACE(c) {
  return (c === 0x09/* Tab */) || (c === 0x20/* Space */);
}

function is_WS_OR_EOL(c) {
  return (c === 0x09/* Tab */) ||
         (c === 0x20/* Space */) ||
         (c === 0x0A/* LF */) ||
         (c === 0x0D/* CR */);
}

function is_FLOW_INDICATOR(c) {
  return c === 0x2C/* , */ ||
         c === 0x5B/* [ */ ||
         c === 0x5D/* ] */ ||
         c === 0x7B/* { */ ||
         c === 0x7D/* } */;
}

function fromHexCode(c) {
  var lc;

if ((0x30/* 0 */ <= c) && (c <= 0x39/* 9 */)) {
    return c - 0x30;
  }

/*eslint-disable no-bitwise*/
  lc = c | 0x20;

if ((0x61/* a */ <= lc) && (lc <= 0x66/* f */)) {
    return lc - 0x61 + 10;
  }

return -1;
}

function escapedHexLen(c) {
  if (c === 0x78/* x */) { return 2; }
  if (c === 0x75/* u */) { return 4; }
  if (c === 0x55/* U */) { return 8; }
  return 0;
}

function fromDecimalCode(c) {
  if ((0x30/* 0 */ <= c) && (c <= 0x39/* 9 */)) {
    return c - 0x30;
  }

return -1;
}

function simpleEscapeSequence(c) {
  /* eslint-disable indent */
  return (c === 0x30/* 0 */) ? '\x00' :
        (c === 0x61/* a */) ? '\x07' :
        (c === 0x62/* b */) ? '\x08' :
        (c === 0x74/* t */) ? '\x09' :
        (c === 0x09/* Tab */) ? '\x09' :
        (c === 0x6E/* n */) ? '\x0A' :
        (c === 0x76/* v */) ? '\x0B' :
        (c === 0x66/* f */) ? '\x0C' :
        (c === 0x72/* r */) ? '\x0D' :
        (c === 0x65/* e */) ? '\x1B' :
        (c === 0x20/* Space */) ? ' ' :
        (c === 0x22/* " */) ? '\x22' :
        (c === 0x2F/* / */) ? '/' :
        (c === 0x5C/* \ */) ? '\x5C' :
        (c === 0x4E/* N */) ? '\x85' :
        (c === 0x5F/* _ */) ? '\xA0' :
        (c === 0x4C/* L */) ? '\u2028' :
        (c === 0x50/* P */) ? '\u2029' : '';
}

function charFromCodepoint(c) {
  if (c <= 0xFFFF) {
    return String.fromCharCode(c);
  }
  // Encode UTF-16 surrogate pair
  // https://en.wikipedia.org/wiki/UTF-16#Code_points_U.2B010000_to_U.2B10FFFF
  return String.fromCharCode(
    ((c - 0x010000) >> 10) + 0xD800,
    ((c - 0x010000) & 0x03FF) + 0xDC00
  );
}

var simpleEscapeCheck = new Array(256); // integer, for fast access
var simpleEscapeMap = new Array(256);
for (var i = 0; i < 256; i++) {
  simpleEscapeCheck[i] = simpleEscapeSequence(i) ? 1 : 0;
  simpleEscapeMap[i] = simpleEscapeSequence(i);
}

function State(input, options) {
  this.input = input;

this.filename  = options['filename']  || null;
  this.schema    = options['schema']    || DEFAULT_SCHEMA;
  this.onWarning = options['onWarning'] || null;
  // (Hidden) Remove? makes the loader to expect YAML 1.1 documents
  // if such documents have no explicit %YAML directive
  this.legacy    = options['legacy']    || false;

this.json      = options['json']      || false;
  this.listener  = options['listener']  || null;

this.implicitTypes = this.schema.compiledImplicit;
  this.typeMap       = this.schema.compiledTypeMap;

this.length     = input.length;
  this.position   = 0;
  this.line       = 0;
  this.lineStart  = 0;
  this.lineIndent = 0;

// position of first leading tab in the current line,
  // used to make sure there are no tabs in the indentation
  this.firstTabInLine = -1;

this.documents = [];

/*
  this.version;
  this.checkLineBreaks;
  this.tagMap;
  this.anchorMap;
  this.tag;
  this.anchor;
  this.kind;
  this.result;*/

}

function generateError(state, message) {
  var mark = {
    name:     state.filename,
    buffer:   state.input.slice(0, -1), // omit trailing \0
    position: state.position,
    line:     state.line,
    column:   state.position - state.lineStart
  };

mark.snippet = makeSnippet(mark);

return new YAMLException(message, mark);
}

function throwError(state, message) {
  throw generateError(state, message);
}

function throwWarning(state, message) {
  if (state.onWarning) {
    state.onWarning.call(null, generateError(state, message));
  }
}

var directiveHandlers = {

YAML: function handleYamlDirective(state, name, args) {

var match, major, minor;

if (state.version !== null) {
      throwError(state, 'duplication of %YAML directive');
    }

if (args.length !== 1) {
      throwError(state, 'YAML directive accepts exactly one argument');
    }

match = /^([0-9]+)\.([0-9]+)$/.exec(args[0]);

if (match === null) {
      throwError(state, 'ill-formed argument of the YAML directive');
    }

major = parseInt(match[1], 10);
    minor = parseInt(match[2], 10);

if (major !== 1) {
      throwError(state, 'unacceptable YAML version of the document');
    }

state.version = args[0];
    state.checkLineBreaks = (minor < 2);

if (minor !== 1 && minor !== 2) {
      throwWarning(state, 'unsupported YAML version of the document');
    }
  },

TAG: function handleTagDirective(state, name, args) {

var handle, prefix;

if (args.length !== 2) {
      throwError(state, 'TAG directive accepts exactly two arguments');
    }

handle = args[0];
    prefix = args[1];

if (!PATTERN_TAG_HANDLE.test(handle)) {
      throwError(state, 'ill-formed tag handle (first argument) of the TAG directive');
    }

if (_hasOwnProperty.call(state.tagMap, handle)) {
      throwError(state, 'there is a previously declared suffix for "' + handle + '" tag handle');
    }

if (!PATTERN_TAG_URI.test(prefix)) {
      throwError(state, 'ill-formed tag prefix (second argument) of the TAG directive');
    }

try {
      prefix = decodeURIComponent(prefix);
    } catch (err) {
      throwError(state, 'tag prefix is malformed: ' + prefix);
    }

state.tagMap[handle] = prefix;
  }
};

function captureSegment(state, start, end, checkJson) {
  var _position, _length, _character, _result;

if (start < end) {
    _result = state.input.slice(start, end);

if (checkJson) {
      for (_position = 0, _length = _result.length; _position < _length; _position += 1) {
        _character = _result.charCodeAt(_position);
        if (!(_character === 0x09 ||
              (0x20 <= _character && _character <= 0x10FFFF))) {
          throwError(state, 'expected valid JSON character');
        }
      }
    } else if (PATTERN_NON_PRINTABLE.test(_result)) {
      throwError(state, 'the stream contains non-printable characters');
    }

state.result += _result;
  }
}

function mergeMappings(state, destination, source, overridableKeys) {
  var sourceKeys, key, index, quantity;

if (!common.isObject(source)) {
    throwError(state, 'cannot merge mappings; the provided source object is unacceptable');
  }

sourceKeys = Object.keys(source);

for (index = 0, quantity = sourceKeys.length; index < quantity; index += 1) {
    key = sourceKeys[index];

if (!_hasOwnProperty.call(destination, key)) {
      destination[key] = source[key];
      overridableKeys[key] = true;
    }
  }
}

function storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, valueNode,
  startLine, startLineStart, startPos) {

var index, quantity;

// The output is a plain object here, so keys can only be strings.
  // We need to convert keyNode to a string, but doing so can hang the process
  // (deeply nested arrays that explode exponentially using aliases).
  if (Array.isArray(keyNode)) {
    keyNode = Array.prototype.slice.call(keyNode);

for (index = 0, quantity = keyNode.length; index < quantity; index += 1) {
      if (Array.isArray(keyNode[index])) {
        throwError(state, 'nested arrays are not supported inside keys');
      }

if (typeof keyNode === 'object' && _class(keyNode[index]) === '[object Object]') {
        keyNode[index] = '[object Object]';
      }
    }
  }

// Avoid code execution in load() via toString property
  // (still use its own toString for arrays, timestamps,
  // and whatever user schema extensions happen to have @@toStringTag)
  if (typeof keyNode === 'object' && _class(keyNode) === '[object Object]') {
    keyNode = '[object Object]';
  }

keyNode = String(keyNode);

if (_result === null) {
    _result = {};
  }

if (keyTag === 'tag:yaml.org,2002:merge') {
    if (Array.isArray(valueNode)) {
      for (index = 0, quantity = valueNode.length; index < quantity; index += 1) {
        mergeMappings(state, _result, valueNode[index], overridableKeys);
      }
    } else {
      mergeMappings(state, _result, valueNode, overridableKeys);
    }
  } else {
    if (!state.json &&
        !_hasOwnProperty.call(overridableKeys, keyNode) &&
        _hasOwnProperty.call(_result, keyNode)) {
      state.line = startLine || state.line;
      state.lineStart = startLineStart || state.lineStart;
      state.position = startPos || state.position;
      throwError(state, 'duplicated mapping key');
    }

// used for this specific key only because Object.defineProperty is slow
    if (keyNode === '__proto__') {
      Object.defineProperty(_result, keyNode, {
        configurable: true,
        enumerable: true,
        writable: true,
        value: valueNode
      });
    } else {
      _result[keyNode] = valueNode;
    }
    delete overridableKeys[keyNode];
  }

return _result;
}

function readLineBreak(state) {
  var ch;

ch = state.input.charCodeAt(state.position);

if (ch === 0x0A/* LF */) {
    state.position++;
  } else if (ch === 0x0D/* CR */) {
    state.position++;
    if (state.input.charCodeAt(state.position) === 0x0A/* LF */) {
      state.position++;
    }
  } else {
    throwError(state, 'a line break is expected');
  }

state.line += 1;
  state.lineStart = state.position;
  state.firstTabInLine = -1;
}

function skipSeparationSpace(state, allowComments, checkIndent) {
  var lineBreaks = 0,
      ch = state.input.charCodeAt(state.position);

while (ch !== 0) {
    while (is_WHITE_SPACE(ch)) {
      if (ch === 0x09/* Tab */ && state.firstTabInLine === -1) {
        state.firstTabInLine = state.position;
      }
      ch = state.input.charCodeAt(++state.position);
    }

if (allowComments && ch === 0x23/* # */) {
      do {
        ch = state.input.charCodeAt(++state.position);
      } while (ch !== 0x0A/* LF */ && ch !== 0x0D/* CR */ && ch !== 0);
    }

if (is_EOL(ch)) {
      readLineBreak(state);

ch = state.input.charCodeAt(state.position);
      lineBreaks++;
      state.lineIndent = 0;

while (ch === 0x20/* Space */) {
        state.lineIndent++;
        ch = state.input.charCodeAt(++state.position);
      }
    } else {
      break;
    }
  }

if (checkIndent !== -1 && lineBreaks !== 0 && state.lineIndent < checkIndent) {
    throwWarning(state, 'deficient indentation');
  }

return lineBreaks;
}

function testDocumentSeparator(state) {
  var _position = state.position,
      ch;

ch = state.input.charCodeAt(_position);

// Condition state.position === state.lineStart is tested
  // in parent on each call, for efficiency. No needs to test here again.
  if ((ch === 0x2D/* - */ || ch === 0x2E/* . */) &&
      ch === state.input.charCodeAt(_position + 1) &&
      ch === state.input.charCodeAt(_position + 2)) {

_position += 3;

ch = state.input.charCodeAt(_position);

if (ch === 0 || is_WS_OR_EOL(ch)) {
      return true;
    }
  }

return false;
}

function writeFoldedLines(state, count) {
  if (count === 1) {
    state.result += ' ';
  } else if (count > 1) {
    state.result += common.repeat('\n', count - 1);
  }
}

function readPlainScalar(state, nodeIndent, withinFlowCollection) {
  var preceding,
      following,
      captureStart,
      captureEnd,
      hasPendingContent,
      _line,
      _lineStart,
      _lineIndent,
      _kind = state.kind,
      _result = state.result,
      ch;

ch = state.input.charCodeAt(state.position);

if (is_WS_OR_EOL(ch)      ||
      is_FLOW_INDICATOR(ch) ||
      ch === 0x23/* # */    ||
      ch === 0x26/* & */    ||
      ch === 0x2A/* * */    ||
      ch === 0x21/* ! */    ||
      ch === 0x7C/* | */    ||
      ch === 0x3E/* > */    ||
      ch === 0x27/* ' */    ||
      ch === 0x22/* " */    ||
      ch === 0x25/* % */    ||
      ch === 0x40/* @ */    ||
      ch === 0x60/* ` */) {
    return false;
  }

if (ch === 0x3F/* ? */ || ch === 0x2D/* - */) {
    following = state.input.charCodeAt(state.position + 1);

if (is_WS_OR_EOL(following) ||
        withinFlowCollection && is_FLOW_INDICATOR(following)) {
      return false;
    }
  }

state.kind = 'scalar';
  state.result = '';
  captureStart = captureEnd = state.position;
  hasPendingContent = false;

while (ch !== 0) {
    if (ch === 0x3A/* : */) {
      following = state.input.charCodeAt(state.position + 1);

if (is_WS_OR_EOL(following) ||
          withinFlowCollection && is_FLOW_INDICATOR(following)) {
        break;
      }

} else if (ch === 0x23/* # */) {
      preceding = state.input.charCodeAt(state.position - 1);

if (is_WS_OR_EOL(preceding)) {
        break;
      }

} else if ((state.position === state.lineStart && testDocumentSeparator(state)) ||
               withinFlowCollection && is_FLOW_INDICATOR(ch)) {
      break;

} else if (is_EOL(ch)) {
      _line = state.line;
      _lineStart = state.lineStart;
      _lineIndent = state.lineIndent;
      skipSeparationSpace(state, false, -1);

if (state.lineIndent >= nodeIndent) {
        hasPendingContent = true;
        ch = state.input.charCodeAt(state.position);
        continue;
      } else {
        state.position = captureEnd;
        state.line = _line;
        state.lineStart = _lineStart;
        state.lineIndent = _lineIndent;
        break;
      }
    }

if (hasPendingContent) {
      captureSegment(state, captureStart, captureEnd, false);
      writeFoldedLines(state, state.line - _line);
      captureStart = captureEnd = state.position;
      hasPendingContent = false;
    }

if (!is_WHITE_SPACE(ch)) {
      captureEnd = state.position + 1;
    }

ch = state.input.charCodeAt(++state.position);
  }

captureSegment(state, captureStart, captureEnd, false);

if (state.result) {
    return true;
  }

state.kind = _kind;
  state.result = _result;
  return false;
}

function readSingleQuotedScalar(state, nodeIndent) {
  var ch,
      captureStart, captureEnd;

ch = state.input.charCodeAt(state.position);

if (ch !== 0x27/* ' */) {
    return false;
  }

state.kind = 'scalar';
  state.result = '';
  state.position++;
  captureStart = captureEnd = state.position;

while ((ch = state.input.charCodeAt(state.position)) !== 0) {
    if (ch === 0x27/* ' */) {
      captureSegment(state, captureStart, state.position, true);
      ch = state.input.charCodeAt(++state.position);

if (ch === 0x27/* ' */) {
        captureStart = state.position;
        state.position++;
        captureEnd = state.position;
      } else {
        return true;
      }

} else if (is_EOL(ch)) {
      captureSegment(state, captureStart, captureEnd, true);
      writeFoldedLines(state, skipSeparationSpace(state, false, nodeIndent));
      captureStart = captureEnd = state.position;

} else if (state.position === state.lineStart && testDocumentSeparator(state)) {
      throwError(state, 'unexpected end of the document within a single quoted scalar');

} else {
      state.position++;
      captureEnd = state.position;
    }
  }

throwError(state, 'unexpected end of the stream within a single quoted scalar');
}

function readDoubleQuotedScalar(state, nodeIndent) {
  var captureStart,
      captureEnd,
      hexLength,
      hexResult,
      tmp,
      ch;

ch = state.input.charCodeAt(state.position);

if (ch !== 0x22/* " */) {
    return false;
  }

state.kind = 'scalar';
  state.result = '';
  state.position++;
  captureStart = captureEnd = state.position;

while ((ch = state.input.charCodeAt(state.position)) !== 0) {
    if (ch === 0x22/* " */) {
      captureSegment(state, captureStart, state.position, true);
      state.position++;
      return true;

} else if (ch === 0x5C/* \ */) {
      captureSegment(state, captureStart, state.position, true);
      ch = state.input.charCodeAt(++state.position);

if (is_EOL(ch)) {
        skipSeparationSpace(state, false, nodeIndent);

// TODO: rework to inline fn with no type cast?
      } else if (ch < 256 && simpleEscapeCheck[ch]) {
        state.result += simpleEscapeMap[ch];
        state.position++;

} else if ((tmp = escapedHexLen(ch)) > 0) {
        hexLength = tmp;
        hexResult = 0;

for (; hexLength > 0; hexLength--) {
          ch = state.input.charCodeAt(++state.position);

if ((tmp = fromHexCode(ch)) >= 0) {
            hexResult = (hexResult << 4) + tmp;

} else {
            throwError(state, 'expected hexadecimal character');
          }
        }

state.result += charFromCodepoint(hexResult);

state.position++;

} else {
        throwError(state, 'unknown escape sequence');
      }

captureStart = captureEnd = state.position;

} else if (state.position === state.lineStart && testDocumentSeparator(state)) {
      throwError(state, 'unexpected end of the document within a double quoted scalar');

} else {
      state.position++;
      captureEnd = state.position;
    }
  }

throwError(state, 'unexpected end of the stream within a double quoted scalar');
}

function readFlowCollection(state, nodeIndent) {
  var readNext = true,
      _line,
      _lineStart,
      _pos,
      _tag     = state.tag,
      _result,
      _anchor  = state.anchor,
      following,
      terminator,
      isPair,
      isExplicitPair,
      isMapping,
      overridableKeys = Object.create(null),
      keyNode,
      keyTag,
      valueNode,
      ch;

ch = state.input.charCodeAt(state.position);

if (ch === 0x5B/* [ */) {
    terminator = 0x5D;/* ] */
    isMapping = false;
    _result = [];
  } else if (ch === 0x7B/* { */) {
    terminator = 0x7D;/* } */
    isMapping = true;
    _result = {};
  } else {
    return false;
  }

if (state.anchor !== null) {
    state.anchorMap[state.anchor] = _result;
  }

ch = state.input.charCodeAt(++state.position);

while (ch !== 0) {
    skipSeparationSpace(state, true, nodeIndent);

ch = state.input.charCodeAt(state.position);

if (ch === terminator) {
      state.position++;
      state.tag = _tag;
      state.anchor = _anchor;
      state.kind = isMapping ? 'mapping' : 'sequence';
      state.result = _result;
      return true;
    } else if (!readNext) {
      throwError(state, 'missed comma between flow collection entries');
    } else if (ch === 0x2C/* , */) {
      // "flow collection entries can never be completely empty", as per YAML 1.2, section 7.4
      throwError(state, "expected the node content, but found ','");
    }

keyTag = keyNode = valueNode = null;
    isPair = isExplicitPair = false;

if (ch === 0x3F/* ? */) {
      following = state.input.charCodeAt(state.position + 1);

if (is_WS_OR_EOL(following)) {
        isPair = isExplicitPair = true;
        state.position++;
        skipSeparationSpace(state, true, nodeIndent);
      }
    }

_line = state.line; // Save the current line.
    _lineStart = state.lineStart;
    _pos = state.position;
    composeNode(state, nodeIndent, CONTEXT_FLOW_IN, false, true);
    keyTag = state.tag;
    keyNode = state.result;
    skipSeparationSpace(state, true, nodeIndent);

ch = state.input.charCodeAt(state.position);

if ((isExplicitPair || state.line === _line) && ch === 0x3A/* : */) {
      isPair = true;
      ch = state.input.charCodeAt(++state.position);
      skipSeparationSpace(state, true, nodeIndent);
      composeNode(state, nodeIndent, CONTEXT_FLOW_IN, false, true);
      valueNode = state.result;
    }

if (isMapping) {
      storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, valueNode, _line, _lineStart, _pos);
    } else if (isPair) {
      _result.push(storeMappingPair(state, null, overridableKeys, keyTag, keyNode, valueNode, _line, _lineStart, _pos));
    } else {
      _result.push(keyNode);
    }

skipSeparationSpace(state, true, nodeIndent);

ch = state.input.charCodeAt(state.position);

if (ch === 0x2C/* , */) {
      readNext = true;
      ch = state.input.charCodeAt(++state.position);
    } else {
      readNext = false;
    }
  }

throwError(state, 'unexpected end of the stream within a flow collection');
}

function readBlockScalar(state, nodeIndent) {
  var captureStart,
      folding,
      chomping       = CHOMPING_CLIP,
      didReadContent = false,
      detectedIndent = false,
      textIndent     = nodeIndent,
      emptyLines     = 0,
      atMoreIndented = false,
      tmp,
      ch;

ch = state.input.charCodeAt(state.position);

if (ch === 0x7C/* | */) {
    folding = false;
  } else if (ch === 0x3E/* > */) {
    folding = true;
  } else {
    return false;
  }

state.kind = 'scalar';
  state.result = '';

while (ch !== 0) {
    ch = state.input.charCodeAt(++state.position);

if (ch === 0x2B/* + */ || ch === 0x2D/* - */) {
      if (CHOMPING_CLIP === chomping) {
        chomping = (ch === 0x2B/* + */) ? CHOMPING_KEEP : CHOMPING_STRIP;
      } else {
        throwError(state, 'repeat of a chomping mode identifier');
      }

} else if ((tmp = fromDecimalCode(ch)) >= 0) {
      if (tmp === 0) {
        throwError(state, 'bad explicit indentation width of a block scalar; it cannot be less than one');
      } else if (!detectedIndent) {
        textIndent = nodeIndent + tmp - 1;
        detectedIndent = true;
      } else {
        throwError(state, 'repeat of an indentation width identifier');
      }

} else {
      break;
    }
  }

if (is_WHITE_SPACE(ch)) {
    do { ch = state.input.charCodeAt(++state.position); }
    while (is_WHITE_SPACE(ch));

if (ch === 0x23/* # */) {
      do { ch = state.input.charCodeAt(++state.position); }
      while (!is_EOL(ch) && (ch !== 0));
    }
  }

while (ch !== 0) {
    readLineBreak(state);
    state.lineIndent = 0;

ch = state.input.charCodeAt(state.position);

while ((!detectedIndent || state.lineIndent < textIndent) &&
           (ch === 0x20/* Space */)) {
      state.lineIndent++;
      ch = state.input.charCodeAt(++state.position);
    }

if (!detectedIndent && state.lineIndent > textIndent) {
      textIndent = state.lineIndent;
    }

if (is_EOL(ch)) {
      emptyLines++;
      continue;
    }

// End of the scalar.
    if (state.lineIndent < textIndent) {

// Perform the chomping.
      if (chomping === CHOMPING_KEEP) {
        state.result += common.repeat('\n', didReadContent ? 1 + emptyLines : emptyLines);
      } else if (chomping === CHOMPING_CLIP) {
        if (didReadContent) { // i.e. only if the scalar is not empty.
          state.result += '\n';
        }
      }

// Break this `while` cycle and go to the funciton's epilogue.
      break;
    }

// Folded style: use fancy rules to handle line breaks.
    if (folding) {

// Lines starting with white space characters (more-indented lines) are not folded.
      if (is_WHITE_SPACE(ch)) {
        atMoreIndented = true;
        // except for the first content line (cf. Example 8.1)
        state.result += common.repeat('\n', didReadContent ? 1 + emptyLines : emptyLines);

// End of more-indented block.
      } else if (atMoreIndented) {
        atMoreIndented = false;
        state.result += common.repeat('\n', emptyLines + 1);

// Just one line break - perceive as the same line.
      } else if (emptyLines === 0) {
        if (didReadContent) { // i.e. only if we have already read some scalar content.
          state.result += ' ';
        }

// Several line breaks - perceive as different lines.
      } else {
        state.result += common.repeat('\n', emptyLines);
      }

// Literal style: just add exact number of line breaks between content lines.
    } else {
      // Keep all line breaks except the header line break.
      state.result += common.repeat('\n', didReadContent ? 1 + emptyLines : emptyLines);
    }

didReadContent = true;
    detectedIndent = true;
    emptyLines = 0;
    captureStart = state.position;

while (!is_EOL(ch) && (ch !== 0)) {
      ch = state.input.charCodeAt(++state.position);
    }

captureSegment(state, captureStart, state.position, false);
  }

return true;
}

function readBlockSequence(state, nodeIndent) {
  var _line,
      _tag      = state.tag,
      _anchor   = state.anchor,
      _result   = [],
      following,
      detected  = false,
      ch;

// there is a leading tab before this token, so it can't be a block sequence/mapping;
  // it can still be flow sequence/mapping or a scalar
  if (state.firstTabInLine !== -1) return false;

if (state.anchor !== null) {
    state.anchorMap[state.anchor] = _result;
  }

ch = state.input.charCodeAt(state.position);

while (ch !== 0) {
    if (state.firstTabInLine !== -1) {
      state.position = state.firstTabInLine;
      throwError(state, 'tab characters must not be used in indentation');
    }

if (ch !== 0x2D/* - */) {
      break;
    }

following = state.input.charCodeAt(state.position + 1);

if (!is_WS_OR_EOL(following)) {
      break;
    }

detected = true;
    state.position++;

if (skipSeparationSpace(state, true, -1)) {
      if (state.lineIndent <= nodeIndent) {
        _result.push(null);
        ch = state.input.charCodeAt(state.position);
        continue;
      }
    }

_line = state.line;
    composeNode(state, nodeIndent, CONTEXT_BLOCK_IN, false, true);
    _result.push(state.result);
    skipSeparationSpace(state, true, -1);

ch = state.input.charCodeAt(state.position);

if ((state.line === _line || state.lineIndent > nodeIndent) && (ch !== 0)) {
      throwError(state, 'bad indentation of a sequence entry');
    } else if (state.lineIndent < nodeIndent) {
      break;
    }
  }

if (detected) {
    state.tag = _tag;
    state.anchor = _anchor;
    state.kind = 'sequence';
    state.result = _result;
    return true;
  }
  return false;
}

function readBlockMapping(state, nodeIndent, flowIndent) {
  var following,
      allowCompact,
      _line,
      _keyLine,
      _keyLineStart,
      _keyPos,
      _tag          = state.tag,
      _anchor       = state.anchor,
      _result       = {},
      overridableKeys = Object.create(null),
      keyTag        = null,
      keyNode       = null,
      valueNode     = null,
      atExplicitKey = false,
      detected      = false,
      ch;

// there is a leading tab before this token, so it can't be a block sequence/mapping;
  // it can still be flow sequence/mapping or a scalar
  if (state.firstTabInLine !== -1) return false;

if (state.anchor !== null) {
    state.anchorMap[state.anchor] = _result;
  }

ch = state.input.charCodeAt(state.position);

while (ch !== 0) {
    if (!atExplicitKey && state.firstTabInLine !== -1) {
      state.position = state.firstTabInLine;
      throwError(state, 'tab characters must not be used in indentation');
    }

following = state.input.charCodeAt(state.position + 1);
    _line = state.line; // Save the current line.

//
    // Explicit notation case. There are two separate blocks:
    // first for the key (denoted by "?") and second for the value (denoted by ":")
    //
    if ((ch === 0x3F/* ? */ || ch === 0x3A/* : */) && is_WS_OR_EOL(following)) {

if (ch === 0x3F/* ? */) {
        if (atExplicitKey) {
          storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, null, _keyLine, _keyLineStart, _keyPos);
          keyTag = keyNode = valueNode = null;
        }

detected = true;
        atExplicitKey = true;
        allowCompact = true;

} else if (atExplicitKey) {
        // i.e. 0x3A/* : */ === character after the explicit key.
        atExplicitKey = false;
        allowCompact = true;

} else {
        throwError(state, 'incomplete explicit mapping pair; a key node is missed; or followed by a non-tabulated empty line');
      }

state.position += 1;
      ch = following;

//
    // Implicit notation case. Flow-style node as the key first, then ":", and the value.
    //
    } else {
      _keyLine = state.line;
      _keyLineStart = state.lineStart;
      _keyPos = state.position;

if (!composeNode(state, flowIndent, CONTEXT_FLOW_OUT, false, true)) {
        // Neither implicit nor explicit notation.
        // Reading is done. Go to the epilogue.
        break;
      }

if (state.line === _line) {
        ch = state.input.charCodeAt(state.position);

while (is_WHITE_SPACE(ch)) {
          ch = state.input.charCodeAt(++state.position);
        }

if (ch === 0x3A/* : */) {
          ch = state.input.charCodeAt(++state.position);

if (!is_WS_OR_EOL(ch)) {
            throwError(state, 'a whitespace character is expected after the key-value separator within a block mapping');
          }

if (atExplicitKey) {
            storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, null, _keyLine, _keyLineStart, _keyPos);
            keyTag = keyNode = valueNode = null;
          }

detected = true;
          atExplicitKey = false;
          allowCompact = false;
          keyTag = state.tag;
          keyNode = state.result;

} else if (detected) {
          throwError(state, 'can not read an implicit mapping pair; a colon is missed');

} else {
          state.tag = _tag;
          state.anchor = _anchor;
          return true; // Keep the result of `composeNode`.
        }

} else if (detected) {
        throwError(state, 'can not read a block mapping entry; a multiline key may not be an implicit key');

} else {
        state.tag = _tag;
        state.anchor = _anchor;
        return true; // Keep the result of `composeNode`.
      }
    }

//
    // Common reading code for both explicit and implicit notations.
    //
    if (state.line === _line || state.lineIndent > nodeIndent) {
      if (atExplicitKey) {
        _keyLine = state.line;
        _keyLineStart = state.lineStart;
        _keyPos = state.position;
      }

if (composeNode(state, nodeIndent, CONTEXT_BLOCK_OUT, true, allowCompact)) {
        if (atExplicitKey) {
          keyNode = state.result;
        } else {
          valueNode = state.result;
        }
      }

if (!atExplicitKey) {
        storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, valueNode, _keyLine, _keyLineStart, _keyPos);
        keyTag = keyNode = valueNode = null;
      }

skipSeparationSpace(state, true, -1);
      ch = state.input.charCodeAt(state.position);
    }

if ((state.line === _line || state.lineIndent > nodeIndent) && (ch !== 0)) {
      throwError(state, 'bad indentation of a mapping entry');
    } else if (state.lineIndent < nodeIndent) {
      break;
    }
  }

//
  // Epilogue.
  //

// Special case: last mapping's node contains only the key in explicit notation.
  if (atExplicitKey) {
    storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, null, _keyLine, _keyLineStart, _keyPos);
  }

// Expose the resulting mapping.
  if (detected) {
    state.tag = _tag;
    state.anchor = _anchor;
    state.kind = 'mapping';
    state.result = _result;
  }

return detected;
}

function readTagProperty(state) {
  var _position,
      isVerbatim = false,
      isNamed    = false,
      tagHandle,
      tagName,
      ch;

ch = state.input.charCodeAt(state.position);

if (ch !== 0x21/* ! */) return false;

if (state.tag !== null) {
    throwError(state, 'duplication of a tag property');
  }

ch = state.input.charCodeAt(++state.position);

if (ch === 0x3C/* < */) {
    isVerbatim = true;
    ch = state.input.charCodeAt(++state.position);

} else if (ch === 0x21/* ! */) {
    isNamed = true;
    tagHandle = '!!';
    ch = state.input.charCodeAt(++state.position);

} else {
    tagHandle = '!';
  }

_position = state.position;

if (isVerbatim) {
    do { ch = state.input.charCodeAt(++state.position); }
    while (ch !== 0 && ch !== 0x3E/* > */);

if (state.position < state.length) {
      tagName = state.input.slice(_position, state.position);
      ch = state.input.charCodeAt(++state.position);
    } else {
      throwError(state, 'unexpected end of the stream within a verbatim tag');
    }
  } else {
    while (ch !== 0 && !is_WS_OR_EOL(ch)) {

if (ch === 0x21/* ! */) {
        if (!isNamed) {
          tagHandle = state.input.slice(_position - 1, state.position + 1);

if (!PATTERN_TAG_HANDLE.test(tagHandle)) {
            throwError(state, 'named tag handle cannot contain such characters');
          }

isNamed = true;
          _position = state.position + 1;
        } else {
          throwError(state, 'tag suffix cannot contain exclamation marks');
        }
      }

ch = state.input.charCodeAt(++state.position);
    }

tagName = state.input.slice(_position, state.position);

if (PATTERN_FLOW_INDICATORS.test(tagName)) {
      throwError(state, 'tag suffix cannot contain flow indicator characters');
    }
  }

if (tagName && !PATTERN_TAG_URI.test(tagName)) {
    throwError(state, 'tag name cannot contain such characters: ' + tagName);
  }

try {
    tagName = decodeURIComponent(tagName);
  } catch (err) {
    throwError(state, 'tag name is malformed: ' + tagName);
  }

if (isVerbatim) {
    state.tag = tagName;

} else if (_hasOwnProperty.call(state.tagMap, tagHandle)) {
    state.tag = state.tagMap[tagHandle] + tagName;

} else if (tagHandle === '!') {
    state.tag = '!' + tagName;

} else if (tagHandle === '!!') {
    state.tag = 'tag:yaml.org,2002:' + tagName;

} else {
    throwError(state, 'undeclared tag handle "' + tagHandle + '"');
  }

return true;
}

function readAnchorProperty(state) {
  var _position,
      ch;

ch = state.input.charCodeAt(state.position);

if (ch !== 0x26/* & */) return false;

if (state.anchor !== null) {
    throwError(state, 'duplication of an anchor property');
  }

ch = state.input.charCodeAt(++state.position);
  _position = state.position;

while (ch !== 0 && !is_WS_OR_EOL(ch) && !is_FLOW_INDICATOR(ch)) {
    ch = state.input.charCodeAt(++state.position);
  }

if (state.position === _position) {
    throwError(state, 'name of an anchor node must contain at least one character');
  }

state.anchor = state.input.slice(_position, state.position);
  return true;
}

function readAlias(state) {
  var _position, alias,
      ch;

ch = state.input.charCodeAt(state.position);

if (ch !== 0x2A/* * */) return false;

ch = state.input.charCodeAt(++state.position);
  _position = state.position;

while (ch !== 0 && !is_WS_OR_EOL(ch) && !is_FLOW_INDICATOR(ch)) {
    ch = state.input.charCodeAt(++state.position);
  }

if (state.position === _position) {
    throwError(state, 'name of an alias node must contain at least one character');
  }

alias = state.input.slice(_position, state.position);

if (!_hasOwnProperty.call(state.anchorMap, alias)) {
    throwError(state, 'unidentified alias "' + alias + '"');
  }

state.result = state.anchorMap[alias];
  skipSeparationSpace(state, true, -1);
  return true;
}

function composeNode(state, parentIndent, nodeContext, allowToSeek, allowCompact) {
  var allowBlockStyles,
      allowBlockScalars,
      allowBlockCollections,
      indentStatus = 1, // 1: this>parent, 0: this=parent, -1: this<parent
      atNewLine  = false,
      hasContent = false,
      typeIndex,
      typeQuantity,
      typeList,
      type,
      flowIndent,
      blockIndent;

if (state.listener !== null) {
    state.listener('open', state);
  }

state.tag    = null;
  state.anchor = null;
  state.kind   = null;
  state.result = null;

allowBlockStyles = allowBlockScalars = allowBlockCollections =
    CONTEXT_BLOCK_OUT === nodeContext ||
    CONTEXT_BLOCK_IN  === nodeContext;

if (allowToSeek) {
    if (skipSeparationSpace(state, true, -1)) {
      atNewLine = true;

if (state.lineIndent > parentIndent) {
        indentStatus = 1;
      } else if (state.lineIndent === parentIndent) {
        indentStatus = 0;
      } else if (state.lineIndent < parentIndent) {
        indentStatus = -1;
      }
    }
  }

if (indentStatus === 1) {
    while (readTagProperty(state) || readAnchorProperty(state)) {
      if (skipSeparationSpace(state, true, -1)) {
        atNewLine = true;
        allowBlockCollections = allowBlockStyles;

if (state.lineIndent > parentIndent) {
          indentStatus = 1;
        } else if (state.lineIndent === parentIndent) {
          indentStatus = 0;
        } else if (state.lineIndent < parentIndent) {
          indentStatus = -1;
        }
      } else {
        allowBlockCollections = false;
      }
    }
  }

if (allowBlockCollections) {
    allowBlockCollections = atNewLine || allowCompact;
  }

if (indentStatus === 1 || CONTEXT_BLOCK_OUT === nodeContext) {
    if (CONTEXT_FLOW_IN === nodeContext || CONTEXT_FLOW_OUT === nodeContext) {
      flowIndent = parentIndent;
    } else {
      flowIndent = parentIndent + 1;
    }

blockIndent = state.position - state.lineStart;

if (indentStatus === 1) {
      if (allowBlockCollections &&
          (readBlockSequence(state, blockIndent) ||
           readBlockMapping(state, blockIndent, flowIndent)) ||
          readFlowCollection(state, flowIndent)) {
        hasContent = true;
      } else {
        if ((allowBlockScalars && readBlockScalar(state, flowIndent)) ||
            readSingleQuotedScalar(state, flowIndent) ||
            readDoubleQuotedScalar(state, flowIndent)) {
          hasContent = true;

} else if (readAlias(state)) {
          hasContent = true;

if (state.tag !== null || state.anchor !== null) {
            throwError(state, 'alias node should not have any properties');
          }

} else if (readPlainScalar(state, flowIndent, CONTEXT_FLOW_IN === nodeContext)) {
          hasContent = true;

if (state.tag === null) {
            state.tag = '?';
          }
        }

if (state.anchor !== null) {
          state.anchorMap[state.anchor] = state.result;
        }
      }
    } else if (indentStatus === 0) {
      // Special case: block sequences are allowed to have same indentation level as the parent.
      // http://www.yaml.org/spec/1.2/spec.html#id2799784
      hasContent = allowBlockCollections && readBlockSequence(state, blockIndent);
    }
  }

if (state.tag === null) {
    if (state.anchor !== null) {
      state.anchorMap[state.anchor] = state.result;
    }

} else if (state.tag === '?') {
    // Implicit resolving is not allowed for non-scalar types, and '?'
    // non-specific tag is only automatically assigned to plain scalars.
    //
    // We only need to check kind conformity in case user explicitly assigns '?'
    // tag, for example like this: "!<?> [0]"
    //
    if (state.result !== null && state.kind !== 'scalar') {
      throwError(state, 'unacceptable node kind for !<?> tag; it should be "scalar", not "' + state.kind + '"');
    }

for (typeIndex = 0, typeQuantity = state.implicitTypes.length; typeIndex < typeQuantity; typeIndex += 1) {
      type = state.implicitTypes[typeIndex];

if (type.resolve(state.result)) { // `state.result` updated in resolver if matched
        state.result = type.construct(state.result);
        state.tag = type.tag;
        if (state.anchor !== null) {
          state.anchorMap[state.anchor] = state.result;
        }
        break;
      }
    }
  } else if (state.tag !== '!') {
    if (_hasOwnProperty.call(state.typeMap[state.kind || 'fallback'], state.tag)) {
      type = state.typeMap[state.kind || 'fallback'][state.tag];
    } else {
      // looking for multi type
      type = null;
      typeList = state.typeMap.multi[state.kind || 'fallback'];

for (typeIndex = 0, typeQuantity = typeList.length; typeIndex < typeQuantity; typeIndex += 1) {
        if (state.tag.slice(0, typeList[typeIndex].tag.length) === typeList[typeIndex].tag) {
          type = typeList[typeIndex];
          break;
        }
      }
    }

if (!type) {
      throwError(state, 'unknown tag !<' + state.tag + '>');
    }

if (state.result !== null && type.kind !== state.kind) {
      throwError(state, 'unacceptable node kind for !<' + state.tag + '> tag; it should be "' + type.kind + '", not "' + state.kind + '"');
    }

if (!type.resolve(state.result, state.tag)) { // `state.result` updated in resolver if matched
      throwError(state, 'cannot resolve a node with !<' + state.tag + '> explicit tag');
    } else {
      state.result = type.construct(state.result, state.tag);
      if (state.anchor !== null) {
        state.anchorMap[state.anchor] = state.result;
      }
    }
  }

if (state.listener !== null) {
    state.listener('close', state);
  }
  return state.tag !== null ||  state.anchor !== null || hasContent;
}

function readDocument(state) {
  var documentStart = state.position,
      _position,
      directiveName,
      directiveArgs,
      hasDirectives = false,
      ch;

state.version = null;
  state.checkLineBreaks = state.legacy;
  state.tagMap = Object.create(null);
  state.anchorMap = Object.create(null);

while ((ch = state.input.charCodeAt(state.position)) !== 0) {
    skipSeparationSpace(state, true, -1);

ch = state.input.charCodeAt(state.position);

if (state.lineIndent > 0 || ch !== 0x25/* % */) {
      break;
    }

hasDirectives = true;
    ch = state.input.charCodeAt(++state.position);
    _position = state.position;

while (ch !== 0 && !is_WS_OR_EOL(ch)) {
      ch = state.input.charCodeAt(++state.position);
    }

directiveName = state.input.slice(_position, state.position);
    directiveArgs = [];

if (directiveName.length < 1) {
      throwError(state, 'directive name must not be less than one character in length');
    }

while (ch !== 0) {
      while (is_WHITE_SPACE(ch)) {
        ch = state.input.charCodeAt(++state.position);
      }

if (ch === 0x23/* # */) {
        do { ch = state.input.charCodeAt(++state.position); }
        while (ch !== 0 && !is_EOL(ch));
        break;
      }

if (is_EOL(ch)) break;

_position = state.position;

while (ch !== 0 && !is_WS_OR_EOL(ch)) {
        ch = state.input.charCodeAt(++state.position);
      }

directiveArgs.push(state.input.slice(_position, state.position));
    }

if (ch !== 0) readLineBreak(state);

if (_hasOwnProperty.call(directiveHandlers, directiveName)) {
      directiveHandlers[directiveName](state, directiveName, directiveArgs);
    } else {
      throwWarning(state, 'unknown document directive "' + directiveName + '"');
    }
  }

skipSeparationSpace(state, true, -1);

if (state.lineIndent === 0 &&
      state.input.charCodeAt(state.position)     === 0x2D/* - */ &&
      state.input.charCodeAt(state.position + 1) === 0x2D/* - */ &&
      state.input.charCodeAt(state.position + 2) === 0x2D/* - */) {
    state.position += 3;
    skipSeparationSpace(state, true, -1);

} else if (hasDirectives) {
    throwError(state, 'directives end mark is expected');
  }

composeNode(state, state.lineIndent - 1, CONTEXT_BLOCK_OUT, false, true);
  skipSeparationSpace(state, true, -1);

if (state.checkLineBreaks &&
      PATTERN_NON_ASCII_LINE_BREAKS.test(state.input.slice(documentStart, state.position))) {
    throwWarning(state, 'non-ASCII line breaks are interpreted as content');
  }

state.documents.push(state.result);

if (state.position === state.lineStart && testDocumentSeparator(state)) {

if (state.input.charCodeAt(state.position) === 0x2E/* . */) {
      state.position += 3;
      skipSeparationSpace(state, true, -1);
    }
    return;
  }

if (state.position < (state.length - 1)) {
    throwError(state, 'end of the stream or a document separator is expected');
  } else {
    return;
  }
}

function loadDocuments(input, options) {
  input = String(input);
  options = options || {};

if (input.length !== 0) {

// Add tailing `\n` if not exists
    if (input.charCodeAt(input.length - 1) !== 0x0A/* LF */ &&
        input.charCodeAt(input.length - 1) !== 0x0D/* CR */) {
      input += '\n';
    }

// Strip BOM
    if (input.charCodeAt(0) === 0xFEFF) {
      input = input.slice(1);
    }
  }

var state = new State(input, options);

var nullpos = input.indexOf('\0');

if (nullpos !== -1) {
    state.position = nullpos;
    throwError(state, 'null byte is not allowed in input');
  }

// Use 0 as string terminator. That significantly simplifies bounds check.
  state.input += '\0';

while (state.input.charCodeAt(state.position) === 0x20/* Space */) {
    state.lineIndent += 1;
    state.position += 1;
  }

while (state.position < (state.length - 1)) {
    readDocument(state);
  }

return state.documents;
}

function loadAll(input, iterator, options) {
  if (iterator !== null && typeof iterator === 'object' && typeof options === 'undefined') {
    options = iterator;
    iterator = null;
  }

var documents = loadDocuments(input, options);

if (typeof iterator !== 'function') {
    return documents;
  }

for (var index = 0, length = documents.length; index < length; index += 1) {
    iterator(documents[index]);
  }
}

function load(input, options) {
  var documents = loadDocuments(input, options);

if (documents.length === 0) {
    /*eslint-disable no-undefined*/
    return undefined;
  } else if (documents.length === 1) {
    return documents[0];
  }
  throw new YAMLException('expected a single document in the stream, but found more');
}

module.exports.loadAll = loadAll;
module.exports.load    = load;

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