@dolphinweex/himalaya/lib/parser.js

HTML to JSON parser

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = parser;
exports.hasTerminalParent = hasTerminalParent;
exports.rewindStack = rewindStack;
exports.parse = parse;

var _compat = require('./compat');

function parser(tokens, options) {
  var root = { tagName: null, children: [] };
  var state = { tokens: tokens, options: options, cursor: 0, stack: [root] };
  parse(state);
  return root.children;
}

function hasTerminalParent(tagName, stack, terminals) {
  var tagParents = terminals[tagName];
  if (tagParents) {
    var currentIndex = stack.length - 1;
    while (currentIndex >= 0) {
      var parentTagName = stack[currentIndex].tagName;
      if (parentTagName === tagName) {
        break;
      }
      if ((0, _compat.arrayIncludes)(tagParents, parentTagName)) {
        return true;
      }
      currentIndex--;
    }
  }
  return false;
}

function rewindStack(stack, newLength, childrenEndPosition, endPosition) {
  stack[newLength].position.end = endPosition;
  for (var i = newLength + 1, len = stack.length; i < len; i++) {
    stack[i].position.end = childrenEndPosition;
  }
  stack.splice(newLength);
}

function parse(state) {
  var tokens = state.tokens,
      options = state.options;
  var stack = state.stack;

  var nodes = stack[stack.length - 1].children;
  var len = tokens.length;
  var cursor = state.cursor;

  while (cursor < len) {
    var token = tokens[cursor];
    if (token.type !== 'tag-start') {
      nodes.push(token);
      cursor++;
      continue;
    }

    var tagToken = tokens[++cursor];
    cursor++;
    var tagName = tagToken.content;
    if (token.close) {
      var index = stack.length;
      var shouldRewind = false;
      while (--index > -1) {
        if (stack[index].tagName === tagName) {
          shouldRewind = true;
          break;
        }
      }
      while (cursor < len) {
        var endToken = tokens[cursor];
        if (endToken.type !== 'tag-end') break;
        cursor++;
      }
      if (shouldRewind) {
        rewindStack(stack, index, token.position.start, tokens[cursor - 1].position.end);
        break;
      } else {
        continue;
      }
    }

    var isClosingTag = (0, _compat.arrayIncludes)(options.closingTags, tagName);
    var shouldRewindToAutoClose = isClosingTag;
    if (shouldRewindToAutoClose) {
      var terminals = options.closingTagAncestorBreakers;

      shouldRewindToAutoClose = !hasTerminalParent(tagName, stack, terminals);
    }

    if (shouldRewindToAutoClose) {
      // rewind the stack to just above the previous
      // closing tag of the same name
      var currentIndex = stack.length - 1;
      while (currentIndex > 0) {
        if (tagName === stack[currentIndex].tagName) {
          rewindStack(stack, currentIndex, token.position.start, token.position.start);
          var previousIndex = currentIndex - 1;
          nodes = stack[previousIndex].children;
          break;
        }
        currentIndex = currentIndex - 1;
      }
    }

    var attributes = [];
    var attrToken = void 0;
    while (cursor < len) {
      attrToken = tokens[cursor];
      if (attrToken.type === 'tag-end') break;
      attributes.push(attrToken.content);
      cursor++;
    }

    cursor++;
    var children = [];
    var position = {
      start: token.position.start,
      end: attrToken.position.end
    };
    var elementNode = {
      type: 'element',
      tagName: tagToken.content,
      attributes: attributes,
      children: children,
      position: position
    };
    nodes.push(elementNode);

    var hasChildren = !(attrToken.close || (0, _compat.arrayIncludes)(options.voidTags, tagName));
    if (hasChildren) {
      var size = stack.push({ tagName: tagName, children: children, position: position });
      var innerState = { tokens: tokens, options: options, cursor: cursor, stack: stack };
      parse(innerState);
      cursor = innerState.cursor;
      var rewoundInElement = stack.length === size;
      if (rewoundInElement) {
        elementNode.position.end = tokens[cursor - 1].position.end;
      }
    }
  }
  state.cursor = cursor;
}
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