Add config management

1 files changed, 1753 insertions, 0 deletions

diff --git a/node_modules/yaml/dist/parse-cst.js b/node_modules/yaml/dist/parse-cst.js
new file mode 100644
index 0000000..d69bedc
--- /dev/null
+++ b/node_modules/yaml/dist/parse-cst.js
@@ -0,0 +1,1753 @@
+'use strict';
+
+var PlainValue = require('./PlainValue-ec8e588e.js');
+
+class BlankLine extends PlainValue.Node {
+  constructor() {
+    super(PlainValue.Type.BLANK_LINE);
+  }
+  /* istanbul ignore next */
+
+
+  get includesTrailingLines() {
+    // This is never called from anywhere, but if it were,
+    // this is the value it should return.
+    return true;
+  }
+  /**
+   * Parses a blank line from the source
+   *
+   * @param {ParseContext} context
+   * @param {number} start - Index of first \n character
+   * @returns {number} - Index of the character after this
+   */
+
+
+  parse(context, start) {
+    this.context = context;
+    this.range = new PlainValue.Range(start, start + 1);
+    return start + 1;
+  }
+
+}
+
+class CollectionItem extends PlainValue.Node {
+  constructor(type, props) {
+    super(type, props);
+    this.node = null;
+  }
+
+  get includesTrailingLines() {
+    return !!this.node && this.node.includesTrailingLines;
+  }
+  /**
+   * @param {ParseContext} context
+   * @param {number} start - Index of first character
+   * @returns {number} - Index of the character after this
+   */
+
+
+  parse(context, start) {
+    this.context = context;
+    const {
+      parseNode,
+      src
+    } = context;
+    let {
+      atLineStart,
+      lineStart
+    } = context;
+    if (!atLineStart && this.type === PlainValue.Type.SEQ_ITEM) this.error = new PlainValue.YAMLSemanticError(this, 'Sequence items must not have preceding content on the same line');
+    const indent = atLineStart ? start - lineStart : context.indent;
+    let offset = PlainValue.Node.endOfWhiteSpace(src, start + 1);
+    let ch = src[offset];
+    const inlineComment = ch === '#';
+    const comments = [];
+    let blankLine = null;
+
+    while (ch === '\n' || ch === '#') {
+      if (ch === '#') {
+        const end = PlainValue.Node.endOfLine(src, offset + 1);
+        comments.push(new PlainValue.Range(offset, end));
+        offset = end;
+      } else {
+        atLineStart = true;
+        lineStart = offset + 1;
+        const wsEnd = PlainValue.Node.endOfWhiteSpace(src, lineStart);
+
+        if (src[wsEnd] === '\n' && comments.length === 0) {
+          blankLine = new BlankLine();
+          lineStart = blankLine.parse({
+            src
+          }, lineStart);
+        }
+
+        offset = PlainValue.Node.endOfIndent(src, lineStart);
+      }
+
+      ch = src[offset];
+    }
+
+    if (PlainValue.Node.nextNodeIsIndented(ch, offset - (lineStart + indent), this.type !== PlainValue.Type.SEQ_ITEM)) {
+      this.node = parseNode({
+        atLineStart,
+        inCollection: false,
+        indent,
+        lineStart,
+        parent: this
+      }, offset);
+    } else if (ch && lineStart > start + 1) {
+      offset = lineStart - 1;
+    }
+
+    if (this.node) {
+      if (blankLine) {
+        // Only blank lines preceding non-empty nodes are captured. Note that
+        // this means that collection item range start indices do not always
+        // increase monotonically. -- eemeli/yaml#126
+        const items = context.parent.items || context.parent.contents;
+        if (items) items.push(blankLine);
+      }
+
+      if (comments.length) Array.prototype.push.apply(this.props, comments);
+      offset = this.node.range.end;
+    } else {
+      if (inlineComment) {
+        const c = comments[0];
+        this.props.push(c);
+        offset = c.end;
+      } else {
+        offset = PlainValue.Node.endOfLine(src, start + 1);
+      }
+    }
+
+    const end = this.node ? this.node.valueRange.end : offset;
+    this.valueRange = new PlainValue.Range(start, end);
+    return offset;
+  }
+
+  setOrigRanges(cr, offset) {
+    offset = super.setOrigRanges(cr, offset);
+    return this.node ? this.node.setOrigRanges(cr, offset) : offset;
+  }
+
+  toString() {
+    const {
+      context: {
+        src
+      },
+      node,
+      range,
+      value
+    } = this;
+    if (value != null) return value;
+    const str = node ? src.slice(range.start, node.range.start) + String(node) : src.slice(range.start, range.end);
+    return PlainValue.Node.addStringTerminator(src, range.end, str);
+  }
+
+}
+
+class Comment extends PlainValue.Node {
+  constructor() {
+    super(PlainValue.Type.COMMENT);
+  }
+  /**
+   * Parses a comment line from the source
+   *
+   * @param {ParseContext} context
+   * @param {number} start - Index of first character
+   * @returns {number} - Index of the character after this scalar
+   */
+
+
+  parse(context, start) {
+    this.context = context;
+    const offset = this.parseComment(start);
+    this.range = new PlainValue.Range(start, offset);
+    return offset;
+  }
+
+}
+
+function grabCollectionEndComments(node) {
+  let cnode = node;
+
+  while (cnode instanceof CollectionItem) cnode = cnode.node;
+
+  if (!(cnode instanceof Collection)) return null;
+  const len = cnode.items.length;
+  let ci = -1;
+
+  for (let i = len - 1; i >= 0; --i) {
+    const n = cnode.items[i];
+
+    if (n.type === PlainValue.Type.COMMENT) {
+      // Keep sufficiently indented comments with preceding node
+      const {
+        indent,
+        lineStart
+      } = n.context;
+      if (indent > 0 && n.range.start >= lineStart + indent) break;
+      ci = i;
+    } else if (n.type === PlainValue.Type.BLANK_LINE) ci = i;else break;
+  }
+
+  if (ci === -1) return null;
+  const ca = cnode.items.splice(ci, len - ci);
+  const prevEnd = ca[0].range.start;
+
+  while (true) {
+    cnode.range.end = prevEnd;
+    if (cnode.valueRange && cnode.valueRange.end > prevEnd) cnode.valueRange.end = prevEnd;
+    if (cnode === node) break;
+    cnode = cnode.context.parent;
+  }
+
+  return ca;
+}
+class Collection extends PlainValue.Node {
+  static nextContentHasIndent(src, offset, indent) {
+    const lineStart = PlainValue.Node.endOfLine(src, offset) + 1;
+    offset = PlainValue.Node.endOfWhiteSpace(src, lineStart);
+    const ch = src[offset];
+    if (!ch) return false;
+    if (offset >= lineStart + indent) return true;
+    if (ch !== '#' && ch !== '\n') return false;
+    return Collection.nextContentHasIndent(src, offset, indent);
+  }
+
+  constructor(firstItem) {
+    super(firstItem.type === PlainValue.Type.SEQ_ITEM ? PlainValue.Type.SEQ : PlainValue.Type.MAP);
+
+    for (let i = firstItem.props.length - 1; i >= 0; --i) {
+      if (firstItem.props[i].start < firstItem.context.lineStart) {
+        // props on previous line are assumed by the collection
+        this.props = firstItem.props.slice(0, i + 1);
+        firstItem.props = firstItem.props.slice(i + 1);
+        const itemRange = firstItem.props[0] || firstItem.valueRange;
+        firstItem.range.start = itemRange.start;
+        break;
+      }
+    }
+
+    this.items = [firstItem];
+    const ec = grabCollectionEndComments(firstItem);
+    if (ec) Array.prototype.push.apply(this.items, ec);
+  }
+
+  get includesTrailingLines() {
+    return this.items.length > 0;
+  }
+  /**
+   * @param {ParseContext} context
+   * @param {number} start - Index of first character
+   * @returns {number} - Index of the character after this
+   */
+
+
+  parse(context, start) {
+    this.context = context;
+    const {
+      parseNode,
+      src
+    } = context; // It's easier to recalculate lineStart here rather than tracking down the
+    // last context from which to read it -- eemeli/yaml#2
+
+    let lineStart = PlainValue.Node.startOfLine(src, start);
+    const firstItem = this.items[0]; // First-item context needs to be correct for later comment handling
+    // -- eemeli/yaml#17
+
+    firstItem.context.parent = this;
+    this.valueRange = PlainValue.Range.copy(firstItem.valueRange);
+    const indent = firstItem.range.start - firstItem.context.lineStart;
+    let offset = start;
+    offset = PlainValue.Node.normalizeOffset(src, offset);
+    let ch = src[offset];
+    let atLineStart = PlainValue.Node.endOfWhiteSpace(src, lineStart) === offset;
+    let prevIncludesTrailingLines = false;
+
+    while (ch) {
+      while (ch === '\n' || ch === '#') {
+        if (atLineStart && ch === '\n' && !prevIncludesTrailingLines) {
+          const blankLine = new BlankLine();
+          offset = blankLine.parse({
+            src
+          }, offset);
+          this.valueRange.end = offset;
+
+          if (offset >= src.length) {
+            ch = null;
+            break;
+          }
+
+          this.items.push(blankLine);
+          offset -= 1; // blankLine.parse() consumes terminal newline
+        } else if (ch === '#') {
+          if (offset < lineStart + indent && !Collection.nextContentHasIndent(src, offset, indent)) {
+            return offset;
+          }
+
+          const comment = new Comment();
+          offset = comment.parse({
+            indent,
+            lineStart,
+            src
+          }, offset);
+          this.items.push(comment);
+          this.valueRange.end = offset;
+
+          if (offset >= src.length) {
+            ch = null;
+            break;
+          }
+        }
+
+        lineStart = offset + 1;
+        offset = PlainValue.Node.endOfIndent(src, lineStart);
+
+        if (PlainValue.Node.atBlank(src, offset)) {
+          const wsEnd = PlainValue.Node.endOfWhiteSpace(src, offset);
+          const next = src[wsEnd];
+
+          if (!next || next === '\n' || next === '#') {
+            offset = wsEnd;
+          }
+        }
+
+        ch = src[offset];
+        atLineStart = true;
+      }
+
+      if (!ch) {
+        break;
+      }
+
+      if (offset !== lineStart + indent && (atLineStart || ch !== ':')) {
+        if (offset < lineStart + indent) {
+          if (lineStart > start) offset = lineStart;
+          break;
+        } else if (!this.error) {
+          const msg = 'All collection items must start at the same column';
+          this.error = new PlainValue.YAMLSyntaxError(this, msg);
+        }
+      }
+
+      if (firstItem.type === PlainValue.Type.SEQ_ITEM) {
+        if (ch !== '-') {
+          if (lineStart > start) offset = lineStart;
+          break;
+        }
+      } else if (ch === '-' && !this.error) {
+        // map key may start with -, as long as it's followed by a non-whitespace char
+        const next = src[offset + 1];
+
+        if (!next || next === '\n' || next === '\t' || next === ' ') {
+          const msg = 'A collection cannot be both a mapping and a sequence';
+          this.error = new PlainValue.YAMLSyntaxError(this, msg);
+        }
+      }
+
+      const node = parseNode({
+        atLineStart,
+        inCollection: true,
+        indent,
+        lineStart,
+        parent: this
+      }, offset);
+      if (!node) return offset; // at next document start
+
+      this.items.push(node);
+      this.valueRange.end = node.valueRange.end;
+      offset = PlainValue.Node.normalizeOffset(src, node.range.end);
+      ch = src[offset];
+      atLineStart = false;
+      prevIncludesTrailingLines = node.includesTrailingLines; // Need to reset lineStart and atLineStart here if preceding node's range
+      // has advanced to check the current line's indentation level
+      // -- eemeli/yaml#10 & eemeli/yaml#38
+
+      if (ch) {
+        let ls = offset - 1;
+        let prev = src[ls];
+
+        while (prev === ' ' || prev === '\t') prev = src[--ls];
+
+        if (prev === '\n') {
+          lineStart = ls + 1;
+          atLineStart = true;
+        }
+      }
+
+      const ec = grabCollectionEndComments(node);
+      if (ec) Array.prototype.push.apply(this.items, ec);
+    }
+
+    return offset;
+  }
+
+  setOrigRanges(cr, offset) {
+    offset = super.setOrigRanges(cr, offset);
+    this.items.forEach(node => {
+      offset = node.setOrigRanges(cr, offset);
+    });
+    return offset;
+  }
+
+  toString() {
+    const {
+      context: {
+        src
+      },
+      items,
+      range,
+      value
+    } = this;
+    if (value != null) return value;
+    let str = src.slice(range.start, items[0].range.start) + String(items[0]);
+
+    for (let i = 1; i < items.length; ++i) {
+      const item = items[i];
+      const {
+        atLineStart,
+        indent
+      } = item.context;
+      if (atLineStart) for (let i = 0; i < indent; ++i) str += ' ';
+      str += String(item);
+    }
+
+    return PlainValue.Node.addStringTerminator(src, range.end, str);
+  }
+
+}
+
+class Directive extends PlainValue.Node {
+  constructor() {
+    super(PlainValue.Type.DIRECTIVE);
+    this.name = null;
+  }
+
+  get parameters() {
+    const raw = this.rawValue;
+    return raw ? raw.trim().split(/[ \t]+/) : [];
+  }
+
+  parseName(start) {
+    const {
+      src
+    } = this.context;
+    let offset = start;
+    let ch = src[offset];
+
+    while (ch && ch !== '\n' && ch !== '\t' && ch !== ' ') ch = src[offset += 1];
+
+    this.name = src.slice(start, offset);
+    return offset;
+  }
+
+  parseParameters(start) {
+    const {
+      src
+    } = this.context;
+    let offset = start;
+    let ch = src[offset];
+
+    while (ch && ch !== '\n' && ch !== '#') ch = src[offset += 1];
+
+    this.valueRange = new PlainValue.Range(start, offset);
+    return offset;
+  }
+
+  parse(context, start) {
+    this.context = context;
+    let offset = this.parseName(start + 1);
+    offset = this.parseParameters(offset);
+    offset = this.parseComment(offset);
+    this.range = new PlainValue.Range(start, offset);
+    return offset;
+  }
+
+}
+
+class Document extends PlainValue.Node {
+  static startCommentOrEndBlankLine(src, start) {
+    const offset = PlainValue.Node.endOfWhiteSpace(src, start);
+    const ch = src[offset];
+    return ch === '#' || ch === '\n' ? offset : start;
+  }
+
+  constructor() {
+    super(PlainValue.Type.DOCUMENT);
+    this.directives = null;
+    this.contents = null;
+    this.directivesEndMarker = null;
+    this.documentEndMarker = null;
+  }
+
+  parseDirectives(start) {
+    const {
+      src
+    } = this.context;
+    this.directives = [];
+    let atLineStart = true;
+    let hasDirectives = false;
+    let offset = start;
+
+    while (!PlainValue.Node.atDocumentBoundary(src, offset, PlainValue.Char.DIRECTIVES_END)) {
+      offset = Document.startCommentOrEndBlankLine(src, offset);
+
+      switch (src[offset]) {
+        case '\n':
+          if (atLineStart) {
+            const blankLine = new BlankLine();
+            offset = blankLine.parse({
+              src
+            }, offset);
+
+            if (offset < src.length) {
+              this.directives.push(blankLine);
+            }
+          } else {
+            offset += 1;
+            atLineStart = true;
+          }
+
+          break;
+
+        case '#':
+          {
+            const comment = new Comment();
+            offset = comment.parse({
+              src
+            }, offset);
+            this.directives.push(comment);
+            atLineStart = false;
+          }
+          break;
+
+        case '%':
+          {
+            const directive = new Directive();
+            offset = directive.parse({
+              parent: this,
+              src
+            }, offset);
+            this.directives.push(directive);
+            hasDirectives = true;
+            atLineStart = false;
+          }
+          break;
+
+        default:
+          if (hasDirectives) {
+            this.error = new PlainValue.YAMLSemanticError(this, 'Missing directives-end indicator line');
+          } else if (this.directives.length > 0) {
+            this.contents = this.directives;
+            this.directives = [];
+          }
+
+          return offset;
+      }
+    }
+
+    if (src[offset]) {
+      this.directivesEndMarker = new PlainValue.Range(offset, offset + 3);
+      return offset + 3;
+    }
+
+    if (hasDirectives) {
+      this.error = new PlainValue.YAMLSemanticError(this, 'Missing directives-end indicator line');
+    } else if (this.directives.length > 0) {
+      this.contents = this.directives;
+      this.directives = [];
+    }
+
+    return offset;
+  }
+
+  parseContents(start) {
+    const {
+      parseNode,
+      src
+    } = this.context;
+    if (!this.contents) this.contents = [];
+    let lineStart = start;
+
+    while (src[lineStart - 1] === '-') lineStart -= 1;
+
+    let offset = PlainValue.Node.endOfWhiteSpace(src, start);
+    let atLineStart = lineStart === start;
+    this.valueRange = new PlainValue.Range(offset);
+
+    while (!PlainValue.Node.atDocumentBoundary(src, offset, PlainValue.Char.DOCUMENT_END)) {
+      switch (src[offset]) {
+        case '\n':
+          if (atLineStart) {
+            const blankLine = new BlankLine();
+            offset = blankLine.parse({
+              src
+            }, offset);
+
+            if (offset < src.length) {
+              this.contents.push(blankLine);
+            }
+          } else {
+            offset += 1;
+            atLineStart = true;
+          }
+
+          lineStart = offset;
+          break;
+
+        case '#':
+          {
+            const comment = new Comment();
+            offset = comment.parse({
+              src
+            }, offset);
+            this.contents.push(comment);
+            atLineStart = false;
+          }
+          break;
+
+        default:
+          {
+            const iEnd = PlainValue.Node.endOfIndent(src, offset);
+            const context = {
+              atLineStart,
+              indent: -1,
+              inFlow: false,
+              inCollection: false,
+              lineStart,
+              parent: this
+            };
+            const node = parseNode(context, iEnd);
+            if (!node) return this.valueRange.end = iEnd; // at next document start
+
+            this.contents.push(node);
+            offset = node.range.end;
+            atLineStart = false;
+            const ec = grabCollectionEndComments(node);
+            if (ec) Array.prototype.push.apply(this.contents, ec);
+          }
+      }
+
+      offset = Document.startCommentOrEndBlankLine(src, offset);
+    }
+
+    this.valueRange.end = offset;
+
+    if (src[offset]) {
+      this.documentEndMarker = new PlainValue.Range(offset, offset + 3);
+      offset += 3;
+
+      if (src[offset]) {
+        offset = PlainValue.Node.endOfWhiteSpace(src, offset);
+
+        if (src[offset] === '#') {
+          const comment = new Comment();
+          offset = comment.parse({
+            src
+          }, offset);
+          this.contents.push(comment);
+        }
+
+        switch (src[offset]) {
+          case '\n':
+            offset += 1;
+            break;
+
+          case undefined:
+            break;
+
+          default:
+            this.error = new PlainValue.YAMLSyntaxError(this, 'Document end marker line cannot have a non-comment suffix');
+        }
+      }
+    }
+
+    return offset;
+  }
+  /**
+   * @param {ParseContext} context
+   * @param {number} start - Index of first character
+   * @returns {number} - Index of the character after this
+   */
+
+
+  parse(context, start) {
+    context.root = this;
+    this.context = context;
+    const {
+      src
+    } = context;
+    let offset = src.charCodeAt(start) === 0xfeff ? start + 1 : start; // skip BOM
+
+    offset = this.parseDirectives(offset);
+    offset = this.parseContents(offset);
+    return offset;
+  }
+
+  setOrigRanges(cr, offset) {
+    offset = super.setOrigRanges(cr, offset);
+    this.directives.forEach(node => {
+      offset = node.setOrigRanges(cr, offset);
+    });
+    if (this.directivesEndMarker) offset = this.directivesEndMarker.setOrigRange(cr, offset);
+    this.contents.forEach(node => {
+      offset = node.setOrigRanges(cr, offset);
+    });
+    if (this.documentEndMarker) offset = this.documentEndMarker.setOrigRange(cr, offset);
+    return offset;
+  }
+
+  toString() {
+    const {
+      contents,
+      directives,
+      value
+    } = this;
+    if (value != null) return value;
+    let str = directives.join('');
+
+    if (contents.length > 0) {
+      if (directives.length > 0 || contents[0].type === PlainValue.Type.COMMENT) str += '---\n';
+      str += contents.join('');
+    }
+
+    if (str[str.length - 1] !== '\n') str += '\n';
+    return str;
+  }
+
+}
+
+class Alias extends PlainValue.Node {
+  /**
+   * Parses an *alias from the source
+   *
+   * @param {ParseContext} context
+   * @param {number} start - Index of first character
+   * @returns {number} - Index of the character after this scalar
+   */
+  parse(context, start) {
+    this.context = context;
+    const {
+      src
+    } = context;
+    let offset = PlainValue.Node.endOfIdentifier(src, start + 1);
+    this.valueRange = new PlainValue.Range(start + 1, offset);
+    offset = PlainValue.Node.endOfWhiteSpace(src, offset);
+    offset = this.parseComment(offset);
+    return offset;
+  }
+
+}
+
+const Chomp = {
+  CLIP: 'CLIP',
+  KEEP: 'KEEP',
+  STRIP: 'STRIP'
+};
+class BlockValue extends PlainValue.Node {
+  constructor(type, props) {
+    super(type, props);
+    this.blockIndent = null;
+    this.chomping = Chomp.CLIP;
+    this.header = null;
+  }
+
+  get includesTrailingLines() {
+    return this.chomping === Chomp.KEEP;
+  }
+
+  get strValue() {
+    if (!this.valueRange || !this.context) return null;
+    let {
+      start,
+      end
+    } = this.valueRange;
+    const {
+      indent,
+      src
+    } = this.context;
+    if (this.valueRange.isEmpty()) return '';
+    let lastNewLine = null;
+    let ch = src[end - 1];
+
+    while (ch === '\n' || ch === '\t' || ch === ' ') {
+      end -= 1;
+
+      if (end <= start) {
+        if (this.chomping === Chomp.KEEP) break;else return ''; // probably never happens
+      }
+
+      if (ch === '\n') lastNewLine = end;
+      ch = src[end - 1];
+    }
+
+    let keepStart = end + 1;
+
+    if (lastNewLine) {
+      if (this.chomping === Chomp.KEEP) {
+        keepStart = lastNewLine;
+        end = this.valueRange.end;
+      } else {
+        end = lastNewLine;
+      }
+    }
+
+    const bi = indent + this.blockIndent;
+    const folded = this.type === PlainValue.Type.BLOCK_FOLDED;
+    let atStart = true;
+    let str = '';
+    let sep = '';
+    let prevMoreIndented = false;
+
+    for (let i = start; i < end; ++i) {
+      for (let j = 0; j < bi; ++j) {
+        if (src[i] !== ' ') break;
+        i += 1;
+      }
+
+      const ch = src[i];
+
+      if (ch === '\n') {
+        if (sep === '\n') str += '\n';else sep = '\n';
+      } else {
+        const lineEnd = PlainValue.Node.endOfLine(src, i);
+        const line = src.slice(i, lineEnd);
+        i = lineEnd;
+
+        if (folded && (ch === ' ' || ch === '\t') && i < keepStart) {
+          if (sep === ' ') sep = '\n';else if (!prevMoreIndented && !atStart && sep === '\n') sep = '\n\n';
+          str += sep + line; //+ ((lineEnd < end && src[lineEnd]) || '')
+
+          sep = lineEnd < end && src[lineEnd] || '';
+          prevMoreIndented = true;
+        } else {
+          str += sep + line;
+          sep = folded && i < keepStart ? ' ' : '\n';
+          prevMoreIndented = false;
+        }
+
+        if (atStart && line !== '') atStart = false;
+      }
+    }
+
+    return this.chomping === Chomp.STRIP ? str : str + '\n';
+  }
+
+  parseBlockHeader(start) {
+    const {
+      src
+    } = this.context;
+    let offset = start + 1;
+    let bi = '';
+
+    while (true) {
+      const ch = src[offset];
+
+      switch (ch) {
+        case '-':
+          this.chomping = Chomp.STRIP;
+          break;
+
+        case '+':
+          this.chomping = Chomp.KEEP;
+          break;
+
+        case '0':
+        case '1':
+        case '2':
+        case '3':
+        case '4':
+        case '5':
+        case '6':
+        case '7':
+        case '8':
+        case '9':
+          bi += ch;
+          break;
+
+        default:
+          this.blockIndent = Number(bi) || null;
+          this.header = new PlainValue.Range(start, offset);
+          return offset;
+      }
+
+      offset += 1;
+    }
+  }
+
+  parseBlockValue(start) {
+    const {
+      indent,
+      src
+    } = this.context;
+    const explicit = !!this.blockIndent;
+    let offset = start;
+    let valueEnd = start;
+    let minBlockIndent = 1;
+
+    for (let ch = src[offset]; ch === '\n'; ch = src[offset]) {
+      offset += 1;
+      if (PlainValue.Node.atDocumentBoundary(src, offset)) break;
+      const end = PlainValue.Node.endOfBlockIndent(src, indent, offset); // should not include tab?
+
+      if (end === null) break;
+      const ch = src[end];
+      const lineIndent = end - (offset + indent);
+
+      if (!this.blockIndent) {
+        // no explicit block indent, none yet detected
+        if (src[end] !== '\n') {
+          // first line with non-whitespace content
+          if (lineIndent < minBlockIndent) {
+            const msg = 'Block scalars with more-indented leading empty lines must use an explicit indentation indicator';
+            this.error = new PlainValue.YAMLSemanticError(this, msg);
+          }
+
+          this.blockIndent = lineIndent;
+        } else if (lineIndent > minBlockIndent) {
+          // empty line with more whitespace
+          minBlockIndent = lineIndent;
+        }
+      } else if (ch && ch !== '\n' && lineIndent < this.blockIndent) {
+        if (src[end] === '#') break;
+
+        if (!this.error) {
+          const src = explicit ? 'explicit indentation indicator' : 'first line';
+          const msg = `Block scalars must not be less indented than their ${src}`;
+          this.error = new PlainValue.YAMLSemanticError(this, msg);
+        }
+      }
+
+      if (src[end] === '\n') {
+        offset = end;
+      } else {
+        offset = valueEnd = PlainValue.Node.endOfLine(src, end);
+      }
+    }
+
+    if (this.chomping !== Chomp.KEEP) {
+      offset = src[valueEnd] ? valueEnd + 1 : valueEnd;
+    }
+
+    this.valueRange = new PlainValue.Range(start + 1, offset);
+    return offset;
+  }
+  /**
+   * Parses a block value from the source
+   *
+   * Accepted forms are:
+   * ```
+   * BS
+   * block
+   * lines
+   *
+   * BS #comment
+   * block
+   * lines
+   * ```
+   * where the block style BS matches the regexp `[|>][-+1-9]*` and block lines
+   * are empty or have an indent level greater than `indent`.
+   *
+   * @param {ParseContext} context
+   * @param {number} start - Index of first character
+   * @returns {number} - Index of the character after this block
+   */
+
+
+  parse(context, start) {
+    this.context = context;
+    const {
+      src
+    } = context;
+    let offset = this.parseBlockHeader(start);
+    offset = PlainValue.Node.endOfWhiteSpace(src, offset);
+    offset = this.parseComment(offset);
+    offset = this.parseBlockValue(offset);
+    return offset;
+  }
+
+  setOrigRanges(cr, offset) {
+    offset = super.setOrigRanges(cr, offset);
+    return this.header ? this.header.setOrigRange(cr, offset) : offset;
+  }
+
+}
+
+class FlowCollection extends PlainValue.Node {
+  constructor(type, props) {
+    super(type, props);
+    this.items = null;
+  }
+
+  prevNodeIsJsonLike(idx = this.items.length) {
+    const node = this.items[idx - 1];
+    return !!node && (node.jsonLike || node.type === PlainValue.Type.COMMENT && this.prevNodeIsJsonLike(idx - 1));
+  }
+  /**
+   * @param {ParseContext} context
+   * @param {number} start - Index of first character
+   * @returns {number} - Index of the character after this
+   */
+
+
+  parse(context, start) {
+    this.context = context;
+    const {
+      parseNode,
+      src
+    } = context;
+    let {
+      indent,
+      lineStart
+    } = context;
+    let char = src[start]; // { or [
+
+    this.items = [{
+      char,
+      offset: start
+    }];
+    let offset = PlainValue.Node.endOfWhiteSpace(src, start + 1);
+    char = src[offset];
+
+    while (char && char !== ']' && char !== '}') {
+      switch (char) {
+        case '\n':
+          {
+            lineStart = offset + 1;
+            const wsEnd = PlainValue.Node.endOfWhiteSpace(src, lineStart);
+
+            if (src[wsEnd] === '\n') {
+              const blankLine = new BlankLine();
+              lineStart = blankLine.parse({
+                src
+              }, lineStart);
+              this.items.push(blankLine);
+            }
+
+            offset = PlainValue.Node.endOfIndent(src, lineStart);
+
+            if (offset <= lineStart + indent) {
+              char = src[offset];
+
+              if (offset < lineStart + indent || char !== ']' && char !== '}') {
+                const msg = 'Insufficient indentation in flow collection';
+                this.error = new PlainValue.YAMLSemanticError(this, msg);
+              }
+            }
+          }
+          break;
+
+        case ',':
+          {
+            this.items.push({
+              char,
+              offset
+            });
+            offset += 1;
+          }
+          break;
+
+        case '#':
+          {
+            const comment = new Comment();
+            offset = comment.parse({
+              src
+            }, offset);
+            this.items.push(comment);
+          }
+          break;
+
+        case '?':
+        case ':':
+          {
+            const next = src[offset + 1];
+
+            if (next === '\n' || next === '\t' || next === ' ' || next === ',' || // in-flow : after JSON-like key does not need to be followed by whitespace
+            char === ':' && this.prevNodeIsJsonLike()) {
+              this.items.push({
+                char,
+                offset
+              });
+              offset += 1;
+              break;
+            }
+          }
+        // fallthrough
+
+        default:
+          {
+            const node = parseNode({
+              atLineStart: false,
+              inCollection: false,
+              inFlow: true,
+              indent: -1,
+              lineStart,
+              parent: this
+            }, offset);
+
+            if (!node) {
+              // at next document start
+              this.valueRange = new PlainValue.Range(start, offset);
+              return offset;
+            }
+
+            this.items.push(node);
+            offset = PlainValue.Node.normalizeOffset(src, node.range.end);
+          }
+      }
+
+      offset = PlainValue.Node.endOfWhiteSpace(src, offset);
+      char = src[offset];
+    }
+
+    this.valueRange = new PlainValue.Range(start, offset + 1);
+
+    if (char) {
+      this.items.push({
+        char,
+        offset
+      });
+      offset = PlainValue.Node.endOfWhiteSpace(src, offset + 1);
+      offset = this.parseComment(offset);
+    }
+
+    return offset;
+  }
+
+  setOrigRanges(cr, offset) {
+    offset = super.setOrigRanges(cr, offset);
+    this.items.forEach(node => {
+      if (node instanceof PlainValue.Node) {
+        offset = node.setOrigRanges(cr, offset);
+      } else if (cr.length === 0) {
+        node.origOffset = node.offset;
+      } else {
+        let i = offset;
+
+        while (i < cr.length) {
+          if (cr[i] > node.offset) break;else ++i;
+        }
+
+        node.origOffset = node.offset + i;
+        offset = i;
+      }
+    });
+    return offset;
+  }
+
+  toString() {
+    const {
+      context: {
+        src
+      },
+      items,
+      range,
+      value
+    } = this;
+    if (value != null) return value;
+    const nodes = items.filter(item => item instanceof PlainValue.Node);
+    let str = '';
+    let prevEnd = range.start;
+    nodes.forEach(node => {
+      const prefix = src.slice(prevEnd, node.range.start);
+      prevEnd = node.range.end;
+      str += prefix + String(node);
+
+      if (str[str.length - 1] === '\n' && src[prevEnd - 1] !== '\n' && src[prevEnd] === '\n') {
+        // Comment range does not include the terminal newline, but its
+        // stringified value does. Without this fix, newlines at comment ends
+        // get duplicated.
+        prevEnd += 1;
+      }
+    });
+    str += src.slice(prevEnd, range.end);
+    return PlainValue.Node.addStringTerminator(src, range.end, str);
+  }
+
+}
+
+class QuoteDouble extends PlainValue.Node {
+  static endOfQuote(src, offset) {
+    let ch = src[offset];
+
+    while (ch && ch !== '"') {
+      offset += ch === '\\' ? 2 : 1;
+      ch = src[offset];
+    }
+
+    return offset + 1;
+  }
+  /**
+   * @returns {string | { str: string, errors: YAMLSyntaxError[] }}
+   */
+
+
+  get strValue() {
+    if (!this.valueRange || !this.context) return null;
+    const errors = [];
+    const {
+      start,
+      end
+    } = this.valueRange;
+    const {
+      indent,
+      src
+    } = this.context;
+    if (src[end - 1] !== '"') errors.push(new PlainValue.YAMLSyntaxError(this, 'Missing closing "quote')); // Using String#replace is too painful with escaped newlines preceded by
+    // escaped backslashes; also, this should be faster.
+
+    let str = '';
+
+    for (let i = start + 1; i < end - 1; ++i) {
+      const ch = src[i];
+
+      if (ch === '\n') {
+        if (PlainValue.Node.atDocumentBoundary(src, i + 1)) errors.push(new PlainValue.YAMLSemanticError(this, 'Document boundary indicators are not allowed within string values'));
+        const {
+          fold,
+          offset,
+          error
+        } = PlainValue.Node.foldNewline(src, i, indent);
+        str += fold;
+        i = offset;
+        if (error) errors.push(new PlainValue.YAMLSemanticError(this, 'Multi-line double-quoted string needs to be sufficiently indented'));
+      } else if (ch === '\\') {
+        i += 1;
+
+        switch (src[i]) {
+          case '0':
+            str += '\0';
+            break;
+          // null character
+
+          case 'a':
+            str += '\x07';
+            break;
+          // bell character
+
+          case 'b':
+            str += '\b';
+            break;
+          // backspace
+
+          case 'e':
+            str += '\x1b';
+            break;
+          // escape character
+
+          case 'f':
+            str += '\f';
+            break;
+          // form feed
+
+          case 'n':
+            str += '\n';
+            break;
+          // line feed
+
+          case 'r':
+            str += '\r';
+            break;
+          // carriage return
+
+          case 't':
+            str += '\t';
+            break;
+          // horizontal tab
+
+          case 'v':
+            str += '\v';
+            break;
+          // vertical tab
+
+          case 'N':
+            str += '\u0085';
+            break;
+          // Unicode next line
+
+          case '_':
+            str += '\u00a0';
+            break;
+          // Unicode non-breaking space
+
+          case 'L':
+            str += '\u2028';
+            break;
+          // Unicode line separator
+
+          case 'P':
+            str += '\u2029';
+            break;
+          // Unicode paragraph separator
+
+          case ' ':
+            str += ' ';
+            break;
+
+          case '"':
+            str += '"';
+            break;
+
+          case '/':
+            str += '/';
+            break;
+
+          case '\\':
+            str += '\\';
+            break;
+
+          case '\t':
+            str += '\t';
+            break;
+
+          case 'x':
+            str += this.parseCharCode(i + 1, 2, errors);
+            i += 2;
+            break;
+
+          case 'u':
+            str += this.parseCharCode(i + 1, 4, errors);
+            i += 4;
+            break;
+
+          case 'U':
+            str += this.parseCharCode(i + 1, 8, errors);
+            i += 8;
+            break;
+
+          case '\n':
+            // skip escaped newlines, but still trim the following line
+            while (src[i + 1] === ' ' || src[i + 1] === '\t') i += 1;
+
+            break;
+
+          default:
+            errors.push(new PlainValue.YAMLSyntaxError(this, `Invalid escape sequence ${src.substr(i - 1, 2)}`));
+            str += '\\' + src[i];
+        }
+      } else if (ch === ' ' || ch === '\t') {
+        // trim trailing whitespace
+        const wsStart = i;
+        let next = src[i + 1];
+
+        while (next === ' ' || next === '\t') {
+          i += 1;
+          next = src[i + 1];
+        }
+
+        if (next !== '\n') str += i > wsStart ? src.slice(wsStart, i + 1) : ch;
+      } else {
+        str += ch;
+      }
+    }
+
+    return errors.length > 0 ? {
+      errors,
+      str
+    } : str;
+  }
+
+  parseCharCode(offset, length, errors) {
+    const {
+      src
+    } = this.context;
+    const cc = src.substr(offset, length);
+    const ok = cc.length === length && /^[0-9a-fA-F]+$/.test(cc);
+    const code = ok ? parseInt(cc, 16) : NaN;
+
+    if (isNaN(code)) {
+      errors.push(new PlainValue.YAMLSyntaxError(this, `Invalid escape sequence ${src.substr(offset - 2, length + 2)}`));
+      return src.substr(offset - 2, length + 2);
+    }
+
+    return String.fromCodePoint(code);
+  }
+  /**
+   * Parses a "double quoted" value from the source
+   *
+   * @param {ParseContext} context
+   * @param {number} start - Index of first character
+   * @returns {number} - Index of the character after this scalar
+   */
+
+
+  parse(context, start) {
+    this.context = context;
+    const {
+      src
+    } = context;
+    let offset = QuoteDouble.endOfQuote(src, start + 1);
+    this.valueRange = new PlainValue.Range(start, offset);
+    offset = PlainValue.Node.endOfWhiteSpace(src, offset);
+    offset = this.parseComment(offset);
+    return offset;
+  }
+
+}
+
+class QuoteSingle extends PlainValue.Node {
+  static endOfQuote(src, offset) {
+    let ch = src[offset];
+
+    while (ch) {
+      if (ch === "'") {
+        if (src[offset + 1] !== "'") break;
+        ch = src[offset += 2];
+      } else {
+        ch = src[offset += 1];
+      }
+    }
+
+    return offset + 1;
+  }
+  /**
+   * @returns {string | { str: string, errors: YAMLSyntaxError[] }}
+   */
+
+
+  get strValue() {
+    if (!this.valueRange || !this.context) return null;
+    const errors = [];
+    const {
+      start,
+      end
+    } = this.valueRange;
+    const {
+      indent,
+      src
+    } = this.context;
+    if (src[end - 1] !== "'") errors.push(new PlainValue.YAMLSyntaxError(this, "Missing closing 'quote"));
+    let str = '';
+
+    for (let i = start + 1; i < end - 1; ++i) {
+      const ch = src[i];
+
+      if (ch === '\n') {
+        if (PlainValue.Node.atDocumentBoundary(src, i + 1)) errors.push(new PlainValue.YAMLSemanticError(this, 'Document boundary indicators are not allowed within string values'));
+        const {
+          fold,
+          offset,
+          error
+        } = PlainValue.Node.foldNewline(src, i, indent);
+        str += fold;
+        i = offset;
+        if (error) errors.push(new PlainValue.YAMLSemanticError(this, 'Multi-line single-quoted string needs to be sufficiently indented'));
+      } else if (ch === "'") {
+        str += ch;
+        i += 1;
+        if (src[i] !== "'") errors.push(new PlainValue.YAMLSyntaxError(this, 'Unescaped single quote? This should not happen.'));
+      } else if (ch === ' ' || ch === '\t') {
+        // trim trailing whitespace
+        const wsStart = i;
+        let next = src[i + 1];
+
+        while (next === ' ' || next === '\t') {
+          i += 1;
+          next = src[i + 1];
+        }
+
+        if (next !== '\n') str += i > wsStart ? src.slice(wsStart, i + 1) : ch;
+      } else {
+        str += ch;
+      }
+    }
+
+    return errors.length > 0 ? {
+      errors,
+      str
+    } : str;
+  }
+  /**
+   * Parses a 'single quoted' value from the source
+   *
+   * @param {ParseContext} context
+   * @param {number} start - Index of first character
+   * @returns {number} - Index of the character after this scalar
+   */
+
+
+  parse(context, start) {
+    this.context = context;
+    const {
+      src
+    } = context;
+    let offset = QuoteSingle.endOfQuote(src, start + 1);
+    this.valueRange = new PlainValue.Range(start, offset);
+    offset = PlainValue.Node.endOfWhiteSpace(src, offset);
+    offset = this.parseComment(offset);
+    return offset;
+  }
+
+}
+
+function createNewNode(type, props) {
+  switch (type) {
+    case PlainValue.Type.ALIAS:
+      return new Alias(type, props);
+
+    case PlainValue.Type.BLOCK_FOLDED:
+    case PlainValue.Type.BLOCK_LITERAL:
+      return new BlockValue(type, props);
+
+    case PlainValue.Type.FLOW_MAP:
+    case PlainValue.Type.FLOW_SEQ:
+      return new FlowCollection(type, props);
+
+    case PlainValue.Type.MAP_KEY:
+    case PlainValue.Type.MAP_VALUE:
+    case PlainValue.Type.SEQ_ITEM:
+      return new CollectionItem(type, props);
+
+    case PlainValue.Type.COMMENT:
+    case PlainValue.Type.PLAIN:
+      return new PlainValue.PlainValue(type, props);
+
+    case PlainValue.Type.QUOTE_DOUBLE:
+      return new QuoteDouble(type, props);
+
+    case PlainValue.Type.QUOTE_SINGLE:
+      return new QuoteSingle(type, props);
+
+    /* istanbul ignore next */
+
+    default:
+      return null;
+    // should never happen
+  }
+}
+/**
+ * @param {boolean} atLineStart - Node starts at beginning of line
+ * @param {boolean} inFlow - true if currently in a flow context
+ * @param {boolean} inCollection - true if currently in a collection context
+ * @param {number} indent - Current level of indentation
+ * @param {number} lineStart - Start of the current line
+ * @param {Node} parent - The parent of the node
+ * @param {string} src - Source of the YAML document
+ */
+
+
+class ParseContext {
+  static parseType(src, offset, inFlow) {
+    switch (src[offset]) {
+      case '*':
+        return PlainValue.Type.ALIAS;
+
+      case '>':
+        return PlainValue.Type.BLOCK_FOLDED;
+
+      case '|':
+        return PlainValue.Type.BLOCK_LITERAL;
+
+      case '{':
+        return PlainValue.Type.FLOW_MAP;
+
+      case '[':
+        return PlainValue.Type.FLOW_SEQ;
+
+      case '?':
+        return !inFlow && PlainValue.Node.atBlank(src, offset + 1, true) ? PlainValue.Type.MAP_KEY : PlainValue.Type.PLAIN;
+
+      case ':':
+        return !inFlow && PlainValue.Node.atBlank(src, offset + 1, true) ? PlainValue.Type.MAP_VALUE : PlainValue.Type.PLAIN;
+
+      case '-':
+        return !inFlow && PlainValue.Node.atBlank(src, offset + 1, true) ? PlainValue.Type.SEQ_ITEM : PlainValue.Type.PLAIN;
+
+      case '"':
+        return PlainValue.Type.QUOTE_DOUBLE;
+
+      case "'":
+        return PlainValue.Type.QUOTE_SINGLE;
+
+      default:
+        return PlainValue.Type.PLAIN;
+    }
+  }
+
+  constructor(orig = {}, {
+    atLineStart,
+    inCollection,
+    inFlow,
+    indent,
+    lineStart,
+    parent
+  } = {}) {
+    PlainValue._defineProperty(this, "parseNode", (overlay, start) => {
+      if (PlainValue.Node.atDocumentBoundary(this.src, start)) return null;
+      const context = new ParseContext(this, overlay);
+      const {
+        props,
+        type,
+        valueStart
+      } = context.parseProps(start);
+      const node = createNewNode(type, props);
+      let offset = node.parse(context, valueStart);
+      node.range = new PlainValue.Range(start, offset);
+      /* istanbul ignore if */
+
+      if (offset <= start) {
+        // This should never happen, but if it does, let's make sure to at least
+        // step one character forward to avoid a busy loop.
+        node.error = new Error(`Node#parse consumed no characters`);
+        node.error.parseEnd = offset;
+        node.error.source = node;
+        node.range.end = start + 1;
+      }
+
+      if (context.nodeStartsCollection(node)) {
+        if (!node.error && !context.atLineStart && context.parent.type === PlainValue.Type.DOCUMENT) {
+          node.error = new PlainValue.YAMLSyntaxError(node, 'Block collection must not have preceding content here (e.g. directives-end indicator)');
+        }
+
+        const collection = new Collection(node);
+        offset = collection.parse(new ParseContext(context), offset);
+        collection.range = new PlainValue.Range(start, offset);
+        return collection;
+      }
+
+      return node;
+    });
+
+    this.atLineStart = atLineStart != null ? atLineStart : orig.atLineStart || false;
+    this.inCollection = inCollection != null ? inCollection : orig.inCollection || false;
+    this.inFlow = inFlow != null ? inFlow : orig.inFlow || false;
+    this.indent = indent != null ? indent : orig.indent;
+    this.lineStart = lineStart != null ? lineStart : orig.lineStart;
+    this.parent = parent != null ? parent : orig.parent || {};
+    this.root = orig.root;
+    this.src = orig.src;
+  }
+
+  nodeStartsCollection(node) {
+    const {
+      inCollection,
+      inFlow,
+      src
+    } = this;
+    if (inCollection || inFlow) return false;
+    if (node instanceof CollectionItem) return true; // check for implicit key
+
+    let offset = node.range.end;
+    if (src[offset] === '\n' || src[offset - 1] === '\n') return false;
+    offset = PlainValue.Node.endOfWhiteSpace(src, offset);
+    return src[offset] === ':';
+  } // Anchor and tag are before type, which determines the node implementation
+  // class; hence this intermediate step.
+
+
+  parseProps(offset) {
+    const {
+      inFlow,
+      parent,
+      src
+    } = this;
+    const props = [];
+    let lineHasProps = false;
+    offset = this.atLineStart ? PlainValue.Node.endOfIndent(src, offset) : PlainValue.Node.endOfWhiteSpace(src, offset);
+    let ch = src[offset];
+
+    while (ch === PlainValue.Char.ANCHOR || ch === PlainValue.Char.COMMENT || ch === PlainValue.Char.TAG || ch === '\n') {
+      if (ch === '\n') {
+        let inEnd = offset;
+        let lineStart;
+
+        do {
+          lineStart = inEnd + 1;
+          inEnd = PlainValue.Node.endOfIndent(src, lineStart);
+        } while (src[inEnd] === '\n');
+
+        const indentDiff = inEnd - (lineStart + this.indent);
+        const noIndicatorAsIndent = parent.type === PlainValue.Type.SEQ_ITEM && parent.context.atLineStart;
+        if (src[inEnd] !== '#' && !PlainValue.Node.nextNodeIsIndented(src[inEnd], indentDiff, !noIndicatorAsIndent)) break;
+        this.atLineStart = true;
+        this.lineStart = lineStart;
+        lineHasProps = false;
+        offset = inEnd;
+      } else if (ch === PlainValue.Char.COMMENT) {
+        const end = PlainValue.Node.endOfLine(src, offset + 1);
+        props.push(new PlainValue.Range(offset, end));
+        offset = end;
+      } else {
+        let end = PlainValue.Node.endOfIdentifier(src, offset + 1);
+
+        if (ch === PlainValue.Char.TAG && src[end] === ',' && /^[a-zA-Z0-9-]+\.[a-zA-Z0-9-]+,\d\d\d\d(-\d\d){0,2}\/\S/.test(src.slice(offset + 1, end + 13))) {
+          // Let's presume we're dealing with a YAML 1.0 domain tag here, rather
+          // than an empty but 'foo.bar' private-tagged node in a flow collection
+          // followed without whitespace by a plain string starting with a year
+          // or date divided by something.
+          end = PlainValue.Node.endOfIdentifier(src, end + 5);
+        }
+
+        props.push(new PlainValue.Range(offset, end));
+        lineHasProps = true;
+        offset = PlainValue.Node.endOfWhiteSpace(src, end);
+      }
+
+      ch = src[offset];
+    } // '- &a : b' has an anchor on an empty node
+
+
+    if (lineHasProps && ch === ':' && PlainValue.Node.atBlank(src, offset + 1, true)) offset -= 1;
+    const type = ParseContext.parseType(src, offset, inFlow);
+    return {
+      props,
+      type,
+      valueStart: offset
+    };
+  }
+  /**
+   * Parses a node from the source
+   * @param {ParseContext} overlay
+   * @param {number} start - Index of first non-whitespace character for the node
+   * @returns {?Node} - null if at a document boundary
+   */
+
+
+}
+
+// Published as 'yaml/parse-cst'
+function parse(src) {
+  const cr = [];
+
+  if (src.indexOf('\r') !== -1) {
+    src = src.replace(/\r\n?/g, (match, offset) => {
+      if (match.length > 1) cr.push(offset);
+      return '\n';
+    });
+  }
+
+  const documents = [];
+  let offset = 0;
+
+  do {
+    const doc = new Document();
+    const context = new ParseContext({
+      src
+    });
+    offset = doc.parse(context, offset);
+    documents.push(doc);
+  } while (offset < src.length);
+
+  documents.setOrigRanges = () => {
+    if (cr.length === 0) return false;
+
+    for (let i = 1; i < cr.length; ++i) cr[i] -= i;
+
+    let crOffset = 0;
+
+    for (let i = 0; i < documents.length; ++i) {
+      crOffset = documents[i].setOrigRanges(cr, crOffset);
+    }
+
+    cr.splice(0, cr.length);
+    return true;
+  };
+
+  documents.toString = () => documents.join('...\n');
+
+  return documents;
+}
+
+exports.parse = parse;