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'use strict';
var Mixin = require('../../utils/mixin'),
Tokenizer = require('../../tokenizer'),
LocationInfoTokenizerMixin = require('./tokenizer_mixin'),
PositionTrackingPreprocessorMixin = require('../position_tracking/preprocessor_mixin'),
LocationInfoOpenElementStackMixin = require('./open_element_stack_mixin'),
HTML = require('../../common/html'),
inherits = require('util').inherits;
//Aliases
var $ = HTML.TAG_NAMES;
var LocationInfoParserMixin = module.exports = function (parser) {
Mixin.call(this, parser);
this.parser = parser;
this.posTracker = null;
this.lastStartTagToken = null;
this.lastFosterParentingLocation = null;
this.currentToken = null;
};
inherits(LocationInfoParserMixin, Mixin);
LocationInfoParserMixin.prototype._setStartLocation = function (element) {
if (this.lastStartTagToken) {
element.__location = Object.create(this.lastStartTagToken.location);
element.__location.startTag = this.lastStartTagToken.location;
}
else
element.__location = null;
};
LocationInfoParserMixin.prototype._setEndLocation = function (element, closingToken) {
var loc = element.__location;
if (loc) {
if (closingToken.location) {
var ctLoc = closingToken.location,
tn = this.parser.treeAdapter.getTagName(element);
// NOTE: For cases like <p> <p> </p> - First 'p' closes without a closing
// tag and for cases like <td> <p> </td> - 'p' closes without a closing tag.
var isClosingEndTag = closingToken.type === Tokenizer.END_TAG_TOKEN && tn === closingToken.tagName;
if (isClosingEndTag) {
loc.endTag = Object.create(ctLoc);
loc.endOffset = ctLoc.endOffset;
}
else
loc.endOffset = ctLoc.startOffset;
}
else if (closingToken.type === Tokenizer.EOF_TOKEN)
loc.endOffset = this.posTracker.offset;
}
};
LocationInfoParserMixin.prototype._getOverriddenMethods = function (mxn, orig) {
return {
_bootstrap: function (document, fragmentContext) {
orig._bootstrap.call(this, document, fragmentContext);
mxn.lastStartTagToken = null;
mxn.lastFosterParentingLocation = null;
mxn.currentToken = null;
mxn.posTracker = new PositionTrackingPreprocessorMixin(this.tokenizer.preprocessor);
new LocationInfoTokenizerMixin(this.tokenizer);
new LocationInfoOpenElementStackMixin(this.openElements, {
onItemPop: function (element) {
mxn._setEndLocation(element, mxn.currentToken);
}
});
},
_runParsingLoop: function (scriptHandler) {
orig._runParsingLoop.call(this, scriptHandler);
// NOTE: generate location info for elements
// that remains on open element stack
for (var i = this.openElements.stackTop; i >= 0; i--)
mxn._setEndLocation(this.openElements.items[i], mxn.currentToken);
},
//Token processing
_processTokenInForeignContent: function (token) {
mxn.currentToken = token;
orig._processTokenInForeignContent.call(this, token);
},
_processToken: function (token) {
mxn.currentToken = token;
orig._processToken.call(this, token);
//NOTE: <body> and <html> are never popped from the stack, so we need to updated
//their end location explicitly.
var requireExplicitUpdate = token.type === Tokenizer.END_TAG_TOKEN &&
(token.tagName === $.HTML ||
token.tagName === $.BODY && this.openElements.hasInScope($.BODY));
if (requireExplicitUpdate) {
for (var i = this.openElements.stackTop; i >= 0; i--) {
var element = this.openElements.items[i];
if (this.treeAdapter.getTagName(element) === token.tagName) {
mxn._setEndLocation(element, token);
break;
}
}
}
},
//Doctype
_setDocumentType: function (token) {
orig._setDocumentType.call(this, token);
var documentChildren = this.treeAdapter.getChildNodes(this.document),
cnLength = documentChildren.length;
for (var i = 0; i < cnLength; i++) {
var node = documentChildren[i];
if (this.treeAdapter.isDocumentTypeNode(node)) {
node.__location = token.location;
break;
}
}
},
//Elements
_attachElementToTree: function (element) {
//NOTE: _attachElementToTree is called from _appendElement, _insertElement and _insertTemplate methods.
//So we will use token location stored in this methods for the element.
mxn._setStartLocation(element);
mxn.lastStartTagToken = null;
orig._attachElementToTree.call(this, element);
},
_appendElement: function (token, namespaceURI) {
mxn.lastStartTagToken = token;
orig._appendElement.call(this, token, namespaceURI);
},
_insertElement: function (token, namespaceURI) {
mxn.lastStartTagToken = token;
orig._insertElement.call(this, token, namespaceURI);
},
_insertTemplate: function (token) {
mxn.lastStartTagToken = token;
orig._insertTemplate.call(this, token);
var tmplContent = this.treeAdapter.getTemplateContent(this.openElements.current);
tmplContent.__location = null;
},
_insertFakeRootElement: function () {
orig._insertFakeRootElement.call(this);
this.openElements.current.__location = null;
},
//Comments
_appendCommentNode: function (token, parent) {
orig._appendCommentNode.call(this, token, parent);
var children = this.treeAdapter.getChildNodes(parent),
commentNode = children[children.length - 1];
commentNode.__location = token.location;
},
//Text
_findFosterParentingLocation: function () {
//NOTE: store last foster parenting location, so we will be able to find inserted text
//in case of foster parenting
mxn.lastFosterParentingLocation = orig._findFosterParentingLocation.call(this);
return mxn.lastFosterParentingLocation;
},
_insertCharacters: function (token) {
orig._insertCharacters.call(this, token);
var hasFosterParent = this._shouldFosterParentOnInsertion(),
parent = hasFosterParent && mxn.lastFosterParentingLocation.parent ||
this.openElements.currentTmplContent ||
this.openElements.current,
siblings = this.treeAdapter.getChildNodes(parent),
textNodeIdx = hasFosterParent && mxn.lastFosterParentingLocation.beforeElement ?
siblings.indexOf(mxn.lastFosterParentingLocation.beforeElement) - 1 :
siblings.length - 1,
textNode = siblings[textNodeIdx];
//NOTE: if we have location assigned by another token, then just update end position
if (textNode.__location)
textNode.__location.endOffset = token.location.endOffset;
else
textNode.__location = token.location;
}
};
};
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