mediawiki-extensions-Discus.../modules/Parser.js

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'use strict';
/* global $:off */
/**
* @external ThreadItem
*/
var
utils = require( './utils.js' ),
codePointLength = require( 'mediawiki.String' ).codePointLength,
CommentItem = require( './CommentItem.js' ),
HeadingItem = require( './HeadingItem.js' ),
// Hooks::getLocalData()
data = require( './parser/data.json' ),
moment = require( './lib/moment-timezone/moment-timezone-with-data-1970-2030.js' );
/**
* Utilities for detecting and parsing components of discussion pages: signatures, timestamps,
* comments and threads.
*
* @class mw.dt.Parser
*/
function Parser( rootNode ) {
this.rootNode = rootNode;
this.threadItems = null;
this.commentItems = null;
this.commentsById = null;
this.threads = null;
}
OO.initClass( Parser );
/**
* Get text of localisation messages in content language.
*
* @private
* @param {string} contLangVariant Content language variant
* @param {string[]} messages Message keys
* @return {string[]} Message values
*/
function getMessages( contLangVariant, messages ) {
return messages.map( function ( code ) {
return data.contLangMessages[ contLangVariant ][ code ];
} );
}
/**
* Get a regexp that matches timestamps generated using the given date format.
*
* This only supports format characters that are used by the default date format in any of
* MediaWiki's languages, namely: D, d, F, G, H, i, j, l, M, n, Y, xg, xkY (and escape characters),
* and only dates when MediaWiki existed, let's say 2000 onwards (Thai dates before 1941 are
* complicated).
*
* @private
* @param {string} contLangVariant Content language variant
* @param {string} format Date format, as used by MediaWiki
* @param {string} digitsRegexp Regular expression matching a single localised digit, e.g. `[0-9]`
* @param {Object} tzAbbrs Map of localised timezone abbreviations to IANA abbreviations
* for the local timezone, e.g. `{EDT: "EDT", EST: "EST"}`
* @return {string} Regular expression
*/
Parser.prototype.getTimestampRegexp = function ( contLangVariant, format, digitsRegexp, tzAbbrs ) {
var s, p, num, code, endQuote, tzRegexp, regexp;
function regexpGroup( r ) {
return '(' + r + ')';
}
function regexpAlternateGroup( array ) {
return '(' + array.map( mw.util.escapeRegExp ).join( '|' ) + ')';
}
s = '';
// Adapted from Language::sprintfDate()
for ( p = 0; p < format.length; p++ ) {
num = false;
code = format[ p ];
if ( code === 'x' && p < format.length - 1 ) {
code += format[ ++p ];
}
if ( code === 'xk' && p < format.length - 1 ) {
code += format[ ++p ];
}
switch ( code ) {
case 'xx':
s += 'x';
break;
case 'xg':
s += regexpAlternateGroup( getMessages( contLangVariant, [
'january-gen', 'february-gen', 'march-gen', 'april-gen', 'may-gen', 'june-gen',
'july-gen', 'august-gen', 'september-gen', 'october-gen', 'november-gen',
'december-gen'
] ) );
break;
case 'd':
num = '2';
break;
case 'D':
s += regexpAlternateGroup( getMessages( contLangVariant, [
'sun', 'mon', 'tue', 'wed', 'thu', 'fri', 'sat'
] ) );
break;
case 'j':
num = '1,2';
break;
case 'l':
s += regexpAlternateGroup( getMessages( contLangVariant, [
'sunday', 'monday', 'tuesday', 'wednesday', 'thursday',
'friday', 'saturday'
] ) );
break;
case 'F':
s += regexpAlternateGroup( getMessages( contLangVariant, [
'january', 'february', 'march', 'april', 'may_long', 'june',
'july', 'august', 'september', 'october', 'november',
'december'
] ) );
break;
case 'M':
s += regexpAlternateGroup( getMessages( contLangVariant, [
'jan', 'feb', 'mar', 'apr', 'may', 'jun', 'jul', 'aug',
'sep', 'oct', 'nov', 'dec'
] ) );
break;
case 'n':
num = '1,2';
break;
case 'Y':
num = '4';
break;
case 'xkY':
num = '4';
break;
case 'G':
num = '1,2';
break;
case 'H':
num = '2';
break;
case 'i':
num = '2';
break;
case '\\':
// Backslash escaping
if ( p < format.length - 1 ) {
s += mw.util.escapeRegExp( format[ ++p ] );
} else {
s += mw.util.escapeRegExp( '\\' );
}
break;
case '"':
// Quoted literal
if ( p < format.length - 1 ) {
endQuote = format.indexOf( '"', p + 1 );
if ( endQuote === -1 ) {
// No terminating quote, assume literal "
s += '"';
} else {
s += mw.util.escapeRegExp( format.substr( p + 1, endQuote - p - 1 ) );
p = endQuote;
}
} else {
// Quote at end of string, assume literal "
s += '"';
}
break;
default:
s += mw.util.escapeRegExp( format[ p ] );
}
if ( num !== false ) {
s += regexpGroup( digitsRegexp + '{' + num + '}' );
}
}
tzRegexp = regexpAlternateGroup( Object.keys( tzAbbrs ) );
// Hard-coded parentheses and space like in Parser::pstPass2
// Ignore some invisible Unicode characters that often sneak into copy-pasted timestamps (T245784)
regexp = s + '[\\u200E\\u200F]? [\\u200E\\u200F]?\\(' + tzRegexp + '\\)';
return regexp;
};
/**
* Get a function that parses timestamps generated using the given date format, based on the result
* of matching the regexp returned by #getTimestampRegexp.
*
* @private
* @param {string} contLangVariant Content language variant
* @param {string} format Date format, as used by MediaWiki
* @param {string[]|null} digits Localised digits from 0 to 9, e.g. `[ '0', '1', ..., '9' ]`
* @param {string} localTimezone Local timezone IANA name, e.g. `America/New_York`
* @param {Object} tzAbbrs Map of localised timezone abbreviations to IANA abbreviations
* for the local timezone, e.g. `{EDT: "EDT", EST: "EST"}`
* @return {TimestampParser} Timestamp parser function
*/
Parser.prototype.getTimestampParser = function ( contLangVariant, format, digits, localTimezone, tzAbbrs ) {
var p, code, endQuote, matchingGroups = [];
for ( p = 0; p < format.length; p++ ) {
code = format[ p ];
if ( code === 'x' && p < format.length - 1 ) {
code += format[ ++p ];
}
if ( code === 'xk' && p < format.length - 1 ) {
code += format[ ++p ];
}
switch ( code ) {
case 'xx':
break;
case 'xg':
case 'd':
case 'j':
case 'D':
case 'l':
case 'F':
case 'M':
case 'n':
case 'Y':
case 'xkY':
case 'G':
case 'H':
case 'i':
matchingGroups.push( code );
break;
case '\\':
// Backslash escaping
if ( p < format.length - 1 ) {
++p;
}
break;
case '"':
// Quoted literal
if ( p < format.length - 1 ) {
endQuote = format.indexOf( '"', p + 1 );
if ( endQuote !== -1 ) {
p = endQuote;
}
}
break;
default:
break;
}
}
function untransformDigits( text ) {
if ( !digits ) {
return text;
}
return text.replace(
new RegExp( '[' + digits.join( '' ) + ']', 'g' ),
function ( m ) {
return digits.indexOf( m );
}
);
}
/**
* @typedef {function(Array):moment} TimestampParser
*/
/**
* Timestamp parser
*
* @param {Array} match RegExp match data
* @return {moment} Moment date object
*/
return function timestampParser( match ) {
var
year = 0,
monthIdx = 0,
day = 0,
hour = 0,
minute = 0,
tzAbbr,
i, code2, text,
date;
for ( i = 0; i < matchingGroups.length; i++ ) {
code2 = matchingGroups[ i ];
text = match[ i + 1 ];
switch ( code2 ) {
case 'xg':
monthIdx = getMessages( contLangVariant, [
'january-gen', 'february-gen', 'march-gen', 'april-gen', 'may-gen', 'june-gen',
'july-gen', 'august-gen', 'september-gen', 'october-gen', 'november-gen',
'december-gen'
] ).indexOf( text );
break;
case 'd':
case 'j':
day = Number( untransformDigits( text ) );
break;
case 'D':
case 'l':
// Day of the week - unused
break;
case 'F':
monthIdx = getMessages( contLangVariant, [
'january', 'february', 'march', 'april', 'may_long', 'june',
'july', 'august', 'september', 'october', 'november',
'december'
] ).indexOf( text );
break;
case 'M':
monthIdx = getMessages( contLangVariant, [
'jan', 'feb', 'mar', 'apr', 'may', 'jun', 'jul', 'aug',
'sep', 'oct', 'nov', 'dec'
] ).indexOf( text );
break;
case 'n':
monthIdx = Number( untransformDigits( text ) ) - 1;
break;
case 'Y':
year = Number( untransformDigits( text ) );
break;
case 'xkY':
// Thai year
year = Number( untransformDigits( text ) ) - 543;
break;
case 'G':
case 'H':
hour = Number( untransformDigits( text ) );
break;
case 'i':
minute = Number( untransformDigits( text ) );
break;
default:
throw new Error( 'Not implemented' );
}
}
// The last matching group is the timezone abbreviation
tzAbbr = tzAbbrs[ match[ match.length - 1 ] ];
// Most of the time, the timezone abbreviation is not necessary to parse the date, since we
// can assume all times are in the wiki's local timezone.
date = moment.tz( [ year, monthIdx, day, hour, minute ], localTimezone );
// But during the "fall back" at the end of DST, some times will happen twice. Per the docs,
// "Moment Timezone handles this by always using the earlier instance of a duplicated hour."
// https://momentjs.com/timezone/docs/#/using-timezones/parsing-ambiguous-inputs/
// Since the timezone abbreviation disambiguates the DST/non-DST times, we can detect when
// that behavior was incorrect...
if ( date.zoneAbbr() !== tzAbbr ) {
// ...and force the correct parsing. I can't find proper documentation for this feature,
// but this pull request explains it: https://github.com/moment/moment-timezone/pull/101
moment.tz.moveAmbiguousForward = true;
date = moment.tz( [ year, monthIdx, day, hour, minute ], localTimezone );
moment.tz.moveAmbiguousForward = false;
if ( date.zoneAbbr() !== tzAbbr ) {
// This should not be possible for "genuine" timestamps generated by MediaWiki.
// But bots and humans get it wrong when marking up unsigned comments…
// https://pl.wikipedia.org/w/index.php?title=Wikipedia:Kawiarenka/Artykuły&diff=prev&oldid=54772606
date.discussionToolsWarning = 'Timestamp has timezone abbreviation for the wrong time';
} else {
date.discussionToolsWarning = 'Ambiguous time at DST switchover was parsed';
}
}
return date;
};
};
/**
* Get a regexp that matches timestamps in the local date format, for each language variant.
*
* This calls #getTimestampRegexp with predefined data for the current wiki.
*
* @private
* @return {string[]} Regular expressions
*/
Parser.prototype.getLocalTimestampRegexps = function () {
var parser = this;
return Object.keys( data.dateFormat ).map( function ( contLangVariant ) {
return parser.getTimestampRegexp(
contLangVariant,
data.dateFormat[ contLangVariant ],
'[' + data.digits[ contLangVariant ].join( '' ) + ']',
data.timezones[ contLangVariant ]
);
} );
};
/**
* Get a function that parses timestamps in the local date format, for each language variant,
* based on the result of matching the regexps returned by #getLocalTimestampRegexps.
*
* This calls #getTimestampParser with predefined data for the current wiki.
*
* @private
* @return {TimestampParser[]} Timestamp parser functions
*/
Parser.prototype.getLocalTimestampParsers = function () {
var parser = this;
return Object.keys( data.dateFormat ).map( function ( contLangVariant ) {
return parser.getTimestampParser(
contLangVariant,
data.dateFormat[ contLangVariant ],
data.digits[ contLangVariant ],
data.localTimezone,
data.timezones[ contLangVariant ]
);
} );
};
/**
* Callback for document.createTreeWalker that will skip over nodes where we don't want to detect
* comments (or section headings).
*
* @param {Node} node
* @return {number} Appropriate NodeFilter constant
*/
function acceptOnlyNodesAllowingComments( node ) {
// The table of contents has a heading that gets erroneously detected as a section
if ( node.id === 'toc' ) {
return NodeFilter.FILTER_REJECT;
}
return NodeFilter.FILTER_ACCEPT;
}
/**
* Find a timestamp in a given text node
*
* @private
* @param {Text} node Text node
* @param {string[]} timestampRegexps Timestamp regexps
* @return {Object|null} Object with the following keys:
* - {number} offset Length of extra text preceding the node that was used for matching
* - {number} parserIndex Which of the regexps matched
* - {Array} matchData Regexp match data, which specifies the location of the match,
* and which can be parsed using #getLocalTimestampParsers
*/
Parser.prototype.findTimestamp = function ( node, timestampRegexps ) {
var matchData, i,
nodeText = '',
offset = 0;
while ( node ) {
nodeText = node.nodeValue + nodeText;
// In Parsoid HTML, entities are represented as a 'mw:Entity' node, rather than normal HTML
// entities. On Arabic Wikipedia, the "UTC" timezone name contains some non-breaking spaces,
// which apparently are often turned into &nbsp; entities by buggy editing tools. To handle
// this, we must piece together the text, so that our regexp can match those timestamps.
if (
node.previousSibling &&
node.previousSibling.nodeType === Node.ELEMENT_NODE &&
node.previousSibling.getAttribute( 'typeof' ) === 'mw:Entity'
) {
nodeText = node.previousSibling.firstChild.nodeValue + nodeText;
offset += node.previousSibling.firstChild.nodeValue.length;
// If the entity is followed by more text, do this again
if (
node.previousSibling.previousSibling &&
node.previousSibling.previousSibling.nodeType === Node.TEXT_NODE
) {
offset += node.previousSibling.previousSibling.nodeValue.length;
node = node.previousSibling.previousSibling;
} else {
node = null;
}
} else {
node = null;
}
}
for ( i = 0; i < timestampRegexps.length; i++ ) {
// Technically, there could be multiple matches in a single text node. However, the ultimate
// point of this is to find the signatures which precede the timestamps, and any later
// timestamps in the text node can't be directly preceded by a signature (as we require them to
// have links), so we only concern ourselves with the first match.
matchData = nodeText.match( timestampRegexps[ i ] );
if ( matchData ) {
return {
matchData: matchData,
offset: offset,
parserIndex: i
};
}
}
return null;
};
/**
* Get a MediaWiki page title from a URL.
*
* @private
* @param {string} url
* @return {mw.Title|null} Page title, or null if this isn't a link to a page
*/
function getTitleFromUrl( url ) {
var articlePathRegexp, match;
try {
url = new mw.Uri( url );
} catch ( err ) {
// T106244: URL encoded values using fallback 8-bit encoding (invalid UTF-8) cause mediawiki.Uri to crash
return null;
}
if ( url.query.title ) {
return mw.Title.newFromText( url.query.title );
}
articlePathRegexp = new RegExp(
mw.util.escapeRegExp( mw.config.get( 'wgArticlePath' ) )
.replace( mw.util.escapeRegExp( '$1' ), '(.*)' )
);
if ( ( match = url.path.match( articlePathRegexp ) ) ) {
return mw.Title.newFromText( decodeURIComponent( match[ 1 ] ) );
}
return null;
}
/**
* Find a user signature preceding a timestamp.
*
* The signature includes the timestamp node.
*
* A signature must contain at least one link to the user's userpage, discussion page or
* contributions (and may contain other links). The link may be nested in other elements.
*
* @private
* @param {Text} timestampNode Text node
* @param {Node} [until] Node to stop searching at
* @return {Array} Result, a tuple contaning:
* - {Node[]} Sibling nodes comprising the signature, in reverse order (with
* `timestampNode` or its parent node as the first element)
* - {string|null} Username, null for unsigned comments
*/
Parser.prototype.findSignature = function ( timestampNode, until ) {
var node, sigNodes, sigUsername, length, lastLinkNode, links, nodes;
// Support timestamps being linked to the diff introducing the comment:
// if the timestamp node is the only child of a link node, use the link node instead
if (
!timestampNode.previousSibling && !timestampNode.nextSibling &&
timestampNode.parentNode.nodeName.toLowerCase() === 'a'
) {
timestampNode = timestampNode.parentNode;
}
node = timestampNode;
sigNodes = [ node ];
sigUsername = null;
length = 0;
lastLinkNode = timestampNode;
while ( ( node = node.previousSibling ) && length < data.signatureScanLimit && node !== until ) {
sigNodes.push( node );
length += node.textContent ? codePointLength( node.textContent ) : 0;
if ( node.nodeType !== Node.ELEMENT_NODE ) {
continue;
}
links = [];
if ( node.tagName.toLowerCase() === 'a' ) {
links.push( node );
} else {
// Handle links nested in formatting elements.
// Helpful accidental feature: users whose signature is not detected in full (due to
// text formatting) can just wrap it in a <span> to fix that.
// "Ten Pound Hammer • (What did I screw up now?)"
// "« Saper // dyskusja »"
nodes = node.getElementsByTagName( 'a' );
links.push.apply( links, nodes );
}
if ( !links.length ) {
continue;
}
// Use .some() rather than .every() to permit vanity links
// "TonyTheTiger (T / C / WP:FOUR / WP:CHICAGO / WP:WAWARD)"
// eslint-disable-next-line no-loop-func
if ( links.some( function ( link ) {
var username, title;
title = getTitleFromUrl( link.href );
if ( !title ) {
return false;
}
if (
title.getNamespaceId() === mw.config.get( 'wgNamespaceIds' ).user ||
title.getNamespaceId() === mw.config.get( 'wgNamespaceIds' ).user_talk
) {
username = title.getMainText();
if ( username.indexOf( '/' ) !== -1 ) {
return false;
}
} else if (
title.getNamespaceId() === mw.config.get( 'wgNamespaceIds' ).special &&
title.getMainText().split( '/' )[ 0 ] === data.specialContributionsName
) {
username = title.getMainText().split( '/' )[ 1 ];
// Normalize the username: users may link to their contributions with an unnormalized name
username = mw.Title.makeTitle( mw.config.get( 'wgNamespaceIds' ).user, username ).getMainText();
}
if ( !username ) {
return false;
}
if ( mw.util.isIPv6Address( username ) ) {
// Bot-generated links "Preceding unsigned comment added by" have non-standard case
username = username.toUpperCase();
}
// Accept the first link to the user namespace, then only accept links to that user
if ( !sigUsername ) {
sigUsername = username;
}
return username === sigUsername;
} ) ) {
lastLinkNode = node;
}
// Keep looking if a node with links wasn't a link to a user page
// "Doc James (talk · contribs · email)"
}
// Pop excess text nodes
while ( sigNodes[ sigNodes.length - 1 ] !== lastLinkNode ) {
sigNodes.pop();
}
return [ sigNodes, sigUsername ];
};
/**
* Return the next leaf node in the tree order that is not an empty or whitespace-only text node.
*
* In other words, this returns a Text node with content other than whitespace, or an Element node
* with no children, that follows the given node in the HTML source.
*
* @private
* @param {Node} node Node to start searching at. If it isn't a leaf node, its children are ignored.
* @return {Node}
*/
Parser.prototype.nextInterestingLeafNode = function ( node ) {
var treeWalker,
rootNode = this.rootNode;
treeWalker = rootNode.ownerDocument.createTreeWalker(
rootNode,
// eslint-disable-next-line no-bitwise
NodeFilter.SHOW_ELEMENT | NodeFilter.SHOW_TEXT,
function ( n ) {
// Ignore this node and its descendants
// (unless it's the root node, this is a special case for "fakeHeading" handling)
if ( node !== rootNode && ( n === node || n.parentNode === node ) ) {
return NodeFilter.FILTER_REJECT;
}
if (
( n.nodeType === Node.TEXT_NODE && utils.htmlTrim( n.textContent ) !== '' ) ||
( n.nodeType === Node.CDATA_SECTION_NODE && utils.htmlTrim( n.textContent ) !== '' ) ||
( n.nodeType === Node.ELEMENT_NODE && !n.firstChild )
) {
return NodeFilter.FILTER_ACCEPT;
}
return NodeFilter.FILTER_SKIP;
},
false
);
treeWalker.currentNode = node;
treeWalker.nextNode();
if ( !treeWalker.currentNode ) {
throw new Error( 'nextInterestingLeafNode not found' );
}
return treeWalker.currentNode;
};
/**
* Get all discussion comments (and headings) within a DOM subtree.
*
* This returns a flat list, use #getThreads to get a tree structure starting at section headings.
*
* For example, for a MediaWiki discussion like this (we're dealing with HTML DOM here, the wikitext
* syntax is just for illustration):
*
* == A ==
* B. ~~~~
* : C.
* : C. ~~~~
* :: D. ~~~~
* ::: E. ~~~~
* ::: F. ~~~~
* : G. ~~~~
* H. ~~~~
* : I. ~~~~
*
* This function would return a structure like:
*
* [
* HeadingItem( { level: 0, range: (h2: A) } ),
* CommentItem( { level: 1, range: (p: B) } ),
* CommentItem( { level: 2, range: (li: C, li: C) } ),
* CommentItem( { level: 3, range: (li: D) } ),
* CommentItem( { level: 4, range: (li: E) } ),
* CommentItem( { level: 4, range: (li: F) } ),
* CommentItem( { level: 2, range: (li: G) } ),
* CommentItem( { level: 1, range: (p: H) } ),
* CommentItem( { level: 2, range: (li: I) } )
* ]
*
* @param {HTMLElement} rootNode
* @return {ThreadItem[]} Thread items
*/
Parser.prototype.getThreadItems = function () {
if ( !this.threadItems ) {
this.buildThreads();
}
return this.threadItems;
};
/**
* Same as getFlatThreadItems, but only returns the CommentItems
*
* @return {CommentItem[]} Comment items
*/
Parser.prototype.getCommentItems = function () {
if ( !this.commentItems ) {
this.buildThreads();
}
return this.commentItems;
};
/**
* Find a CommentItem by its ID
*
* @param {string} id Comment ID
* @return {CommentItem|null} Comment item, null if not found
*/
Parser.prototype.findCommentById = function ( id ) {
if ( !this.commentsById ) {
this.buildThreads();
}
return this.commentsById[ id ] || null;
};
Parser.prototype.buildThreadItems = function () {
var
dfParsers = this.getLocalTimestampParsers(),
timestampRegexps = this.getLocalTimestampRegexps(),
commentItems = [],
threadItems = [],
treeWalker,
node, range, fakeHeading, curComment,
foundSignature, firstSigNode, lastSigNode, sigRange, author, startNode, endNode, length,
match, lastSigNodeOffset, startLevel, endLevel, level, dateTime, warnings;
treeWalker = this.rootNode.ownerDocument.createTreeWalker(
this.rootNode,
// eslint-disable-next-line no-bitwise
NodeFilter.SHOW_ELEMENT | NodeFilter.SHOW_TEXT,
acceptOnlyNodesAllowingComments,
false
);
// Placeholder heading in case there are comments in the 0th section
range = {
startContainer: this.rootNode,
startOffset: 0,
endContainer: this.rootNode,
endOffset: 0
};
fakeHeading = new HeadingItem( range, true );
fakeHeading.rootNode = this.rootNode;
curComment = fakeHeading;
while ( ( node = treeWalker.nextNode() ) ) {
if ( node.tagName && node.tagName.match( /^h[1-6]$/i ) ) {
range = {
startContainer: node,
startOffset: 0,
endContainer: node,
endOffset: node.childNodes.length
};
curComment = new HeadingItem( range );
curComment.rootNode = this.rootNode;
threadItems.push( curComment );
} else if ( node.nodeType === Node.TEXT_NODE && ( match = this.findTimestamp( node, timestampRegexps ) ) ) {
warnings = [];
foundSignature = this.findSignature( node, lastSigNode );
author = foundSignature[ 1 ];
firstSigNode = foundSignature[ 0 ][ foundSignature[ 0 ].length - 1 ];
lastSigNode = foundSignature[ 0 ][ 0 ];
if ( !author ) {
// Ignore timestamps for which we couldn't find a signature. It's probably not a real
// comment, but just a false match due to a copypasted timestamp.
continue;
}
lastSigNodeOffset = lastSigNode === node ?
match.matchData.index + match.matchData[ 0 ].length - match.offset :
utils.childIndexOf( lastSigNode ) + 1;
sigRange = {
startContainer: firstSigNode.parentNode,
startOffset: utils.childIndexOf( firstSigNode ),
endContainer: lastSigNode === node ? node : lastSigNode.parentNode,
endOffset: lastSigNodeOffset
};
// Everything from the last comment up to here is the next comment
startNode = this.nextInterestingLeafNode( curComment.range.endContainer );
endNode = lastSigNode;
// Skip to the end of the "paragraph". This only looks at tag names and can be fooled by CSS, but
// avoiding that would be more difficult and slower.
while ( endNode.nextSibling && !( endNode.nextSibling instanceof HTMLElement && ve.isBlockElement( endNode.nextSibling ) ) ) {
endNode = endNode.nextSibling;
}
if ( endNode === lastSigNode ) {
range = {
startContainer: startNode.parentNode,
startOffset: utils.childIndexOf( startNode ),
endContainer: sigRange.endContainer,
endOffset: sigRange.endOffset
};
} else {
length = endNode.nodeType === Node.TEXT_NODE ?
endNode.textContent.replace( /[\t\n\f\r ]+$/, '' ).length :
endNode.childNodes.length;
range = {
startContainer: startNode.parentNode,
startOffset: utils.childIndexOf( startNode ),
endContainer: endNode,
endOffset: length
};
}
startLevel = utils.getIndentLevel( startNode, this.rootNode ) + 1;
endLevel = utils.getIndentLevel( node, this.rootNode ) + 1;
if ( startLevel !== endLevel ) {
warnings.push( 'Comment starts and ends with different indentation' );
}
// Should this use the indent level of `startNode` or `node`?
level = Math.min( startLevel, endLevel );
dateTime = dfParsers[ match.parserIndex ]( match.matchData );
if ( dateTime.discussionToolsWarning ) {
warnings.push( dateTime.discussionToolsWarning );
}
// Avoid generating multiple comments when there is more than one signature on a single "line".
// Often this is done when someone edits their comment later and wants to add a note about that.
// (Or when another person corrects a typo, or strikes out a comment, etc.) Multiple comments
// within one paragraph/list-item result in a confusing double "Reply" button, and we also have
// no way to indicate which one you're replying to (this might matter in the future for
// notifications or something).
if (
curComment instanceof CommentItem &&
( utils.closestElement( node, [ 'li', 'dd', 'p' ] ) || node.parentNode ) ===
( utils.closestElement( curComment.range.endContainer, [ 'li', 'dd', 'p' ] ) || curComment.range.endContainer.parentNode )
) {
// Merge this with the previous comment. Use that comment's author and timestamp.
curComment.signatureRanges.push( sigRange );
if (
curComment.range.endContainer === range.endContainer &&
curComment.range.endOffset <= range.endOffset
) {
// We've already skipped over this signature, and the `range` and `level` are messed up,
// because that causes `startNode` to be after `endNode`
continue;
}
curComment.range.endContainer = range.endContainer;
curComment.range.endOffset = range.endOffset;
curComment.level = Math.min( level, curComment.level );
continue;
}
curComment = new CommentItem(
level,
range,
[ sigRange ],
dateTime,
author
);
curComment.rootNode = this.rootNode;
if ( warnings.length ) {
curComment.warnings = warnings;
}
commentItems.push( curComment );
threadItems.push( curComment );
}
}
// Insert the fake placeholder heading if there are any comments in the 0th section
// (before the first real heading)
if ( threadItems.length && !( threadItems[ 0 ] instanceof HeadingItem ) ) {
threadItems.unshift( fakeHeading );
}
this.commentItems = commentItems;
this.threadItems = threadItems;
};
/**
* Group discussion comments into threads and associate replies to original messages.
*
* Each thread must begin with a heading. Original messages in the thread are treated as replies to
* its heading. Other replies are associated based on the order and indentation level.
*
* Note that the objects in `comments` are extended in-place with the additional data.
*
* For example, for a MediaWiki discussion like this (we're dealing with HTML DOM here, the wikitext
* syntax is just for illustration):
*
* == A ==
* B. ~~~~
* : C.
* : C. ~~~~
* :: D. ~~~~
* ::: E. ~~~~
* ::: F. ~~~~
* : G. ~~~~
* H. ~~~~
* : I. ~~~~
*
* This function would return a structure like:
*
* [
* HeadingItem( { level: 0, range: (h2: A), replies: [
* CommentItem( { level: 1, range: (p: B), replies: [
* CommentItem( { level: 2, range: (li: C, li: C), replies: [
* CommentItem( { level: 3, range: (li: D), replies: [
* CommentItem( { level: 4, range: (li: E), replies: [] },
* CommentItem( { level: 4, range: (li: F), replies: [] },
* ] },
* ] },
* CommentItem( { level: 2, range: (li: G), replies: [] },
* ] },
* CommentItem( { level: 1, range: (p: H), replies: [
* CommentItem( { level: 2, range: (li: I), replies: [] },
* ] },
* ] } )
* ]
*
* @return {HeadingItem[]} Tree structure of comments, top-level items are the headings.
*/
Parser.prototype.getThreads = function () {
if ( !this.threads ) {
this.buildThreads();
}
return this.threads;
};
Parser.prototype.buildThreads = function () {
var
threads = [],
replies = [],
i, threadItem, id, number;
if ( !this.threadItems ) {
this.buildThreadItems();
}
this.commentsById = {};
for ( i = 0; i < this.threadItems.length; i++ ) {
threadItem = this.threadItems[ i ];
if ( threadItem instanceof HeadingItem ) {
// We don't need ids for section headings right now, but we might in the future
// e.g. if we allow replying directly to sections (adding top-level comments)
id = null;
} else {
// username+timestamp
id = [
threadItem.author || '',
threadItem.timestamp.toISOString()
].join( '|' );
// If there would be multiple comments with the same ID (i.e. the user left multiple comments
// in one edit, or within a minute), append sequential numbers
number = 0;
while ( this.commentsById[ id + '|' + number ] ) {
number++;
}
id = id + '|' + number;
this.commentsById[ id ] = threadItem;
// This modifies the original objects in `comments`!
threadItem.id = id;
}
if ( replies.length < threadItem.level ) {
// Someone skipped an indentation level (or several). Pretend that the previous reply
// covers multiple indentation levels, so that following comments get connected to it.
threadItem.warnings = threadItem.warnings || [];
threadItem.warnings.push( 'Comment skips indentation level' );
while ( replies.length < threadItem.level ) {
replies[ replies.length ] = replies[ replies.length - 1 ];
}
}
if ( threadItem instanceof HeadingItem ) {
// New root (thread)
threads.push( threadItem );
} else if ( replies[ threadItem.level - 1 ] ) {
// Add as a reply to the closest less-nested comment
threadItem.parent = replies[ threadItem.level - 1 ];
threadItem.parent.replies.push( threadItem );
} else {
threadItem.warnings = threadItem.warnings || [];
threadItem.warnings.push( 'Comment could not be connected to a thread' );
}
replies[ threadItem.level ] = threadItem;
// Cut off more deeply nested replies
replies.length = threadItem.level + 1;
}
this.threads = threads;
};
module.exports = Parser;