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twitter-text.js
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twitter-text.js
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if (!window.twttr) {
window.twttr = {};
}
(function() {
twttr.txt = {};
twttr.txt.regexen = {};
var HTML_ENTITIES = {
'&': '&',
'>': '>',
'<': '<',
'"': '"',
"'": ' '
};
// HTML escaping
twttr.txt.htmlEscape = function(text) {
return text && text.replace(/[&"'><]/g, function(character) {
return HTML_ENTITIES[character];
});
};
// Builds a RegExp
function regexSupplant(regex, flags) {
flags = flags || "";
if (typeof regex !== "string") {
if (regex.global && flags.indexOf("g") < 0) {
flags += "g";
}
if (regex.ignoreCase && flags.indexOf("i") < 0) {
flags += "i";
}
if (regex.multiline && flags.indexOf("m") < 0) {
flags += "m";
}
regex = regex.source;
}
return new RegExp(regex.replace(/#\{(\w+)\}/g, function(match, name) {
var newRegex = twttr.txt.regexen[name] || "";
if (typeof newRegex !== "string") {
newRegex = newRegex.source;
}
return newRegex;
}), flags);
}
// simple string interpolation
function stringSupplant(str, values) {
return str.replace(/#\{(\w+)\}/g, function(match, name) {
return values[name] || "";
});
}
// Space is more than %20, U+3000 for example is the full-width space used with Kanji. Provide a short-hand
// to access both the list of characters and a pattern suitible for use with String#split
// Taken from: ActiveSupport::Multibyte::Handlers::UTF8Handler::UNICODE_WHITESPACE
var fromCode = String.fromCharCode;
var UNICODE_SPACES = [
fromCode(0x0020), // White_Space # Zs SPACE
fromCode(0x0085), // White_Space # Cc <control-0085>
fromCode(0x00A0), // White_Space # Zs NO-BREAK SPACE
fromCode(0x1680), // White_Space # Zs OGHAM SPACE MARK
fromCode(0x180E), // White_Space # Zs MONGOLIAN VOWEL SEPARATOR
fromCode(0x2028), // White_Space # Zl LINE SEPARATOR
fromCode(0x2029), // White_Space # Zp PARAGRAPH SEPARATOR
fromCode(0x202F), // White_Space # Zs NARROW NO-BREAK SPACE
fromCode(0x205F), // White_Space # Zs MEDIUM MATHEMATICAL SPACE
fromCode(0x3000) // White_Space # Zs IDEOGRAPHIC SPACE
];
for (var i = 0x009; i <= 0x000D; i++) { // White_Space # Cc [5] <control-0009>..<control-000D>
UNICODE_SPACES.push(String.fromCharCode(i));
}
for (var i = 0x2000; i <= 0x200A; i++) { // White_Space # Zs [11] EN QUAD..HAIR SPACE
UNICODE_SPACES.push(String.fromCharCode(i));
}
twttr.txt.regexen.spaces = regexSupplant("[" + UNICODE_SPACES.join("") + "]");
twttr.txt.regexen.punct = /\!'#%&'\(\)*\+,\\\-\.\/:;<=>\?@\[\]\^_{|}~/;
twttr.txt.regexen.atSigns = /[@@]/;
twttr.txt.regexen.extractMentions = regexSupplant(/(^|[^a-zA-Z0-9_])(#{atSigns})([a-zA-Z0-9_]{1,20})(?=(.|$))/g);
twttr.txt.regexen.extractReply = regexSupplant(/^(?:#{spaces})*#{atSigns}([a-zA-Z0-9_]{1,20})/);
twttr.txt.regexen.listName = /[a-zA-Z][a-zA-Z0-9_\-\u0080-\u00ff]{0,24}/;
// Latin accented characters (subtracted 0xD7 from the range, it's a confusable multiplication sign. Looks like "x")
twttr.txt.regexen.latinAccentChars = regexSupplant("ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõöøùúûüýþ\\303\\277");
twttr.txt.regexen.latenAccents = regexSupplant(/[#{latinAccentChars}]+/);
twttr.txt.regexen.endScreenNameMatch = regexSupplant(/^(?:#{atSigns}|[#{latinAccentChars}]|:\/\/)/);
// Characters considered valid in a hashtag but not at the beginning, where only a-z and 0-9 are valid.
twttr.txt.regexen.hashtagCharacters = regexSupplant(/[a-z0-9_#{latinAccentChars}]/i);
twttr.txt.regexen.autoLinkHashtags = regexSupplant(/(^|[^0-9A-Z&\/\?]+)(#|#)([0-9A-Z_]*[A-Z_]+#{hashtagCharacters}*)/gi);
twttr.txt.regexen.autoLinkUsernamesOrLists = /(^|[^a-zA-Z0-9_]|RT:?)([@@]+)([a-zA-Z0-9_]{1,20})(\/[a-zA-Z][a-zA-Z0-9_\-]{0,24})?/g;
twttr.txt.regexen.autoLinkEmoticon = /(8\-\#|8\-E|\+\-\(|\`\@|\`O|\<\|:~\(|\}:o\{|:\-\[|\>o\<|X\-\/|\[:-\]\-I\-|\/\/\/\/Ö\\\\\\\\|\(\|:\|\/\)|∑:\*\)|\( \| \))/g;
// URL related hash regex collection
twttr.txt.regexen.validPrecedingChars = regexSupplant(/(?:[^-\/"':!=A-Za-z0-9_@@]|^|\:)/);
twttr.txt.regexen.validDomain = regexSupplant(/(?:[^#{punct}\s][\.-](?=[^#{punct}\s])|[^#{punct}\s]){1,}\.[a-z]{2,}(?::[0-9]+)?/i);
twttr.txt.regexen.validGeneralUrlPathChars = /[a-z0-9!\*';:=\+\$\/%#\[\]\-_,~]/i;
// Allow URL paths to contain balanced parens
// 1. Used in Wikipedia URLs like /Primer_(film)
// 2. Used in IIS sessions like /S(dfd346)/
twttr.txt.regexen.wikipediaDisambiguation = regexSupplant(/(?:\(#{validGeneralUrlPathChars}+\))/i);
// Allow @ in a url, but only in the middle. Catch things like http://example.com/@user
twttr.txt.regexen.validUrlPathChars = regexSupplant(/(?:#{wikipediaDisambiguation}|@#{validGeneralUrlPathChars}+\/|[\.,]?#{validGeneralUrlPathChars})/i);
// Valid end-of-path chracters (so /foo. does not gobble the period).
// 1. Allow =&# for empty URL parameters and other URL-join artifacts
twttr.txt.regexen.validUrlPathEndingChars = regexSupplant(/(?:[a-z0-9=_#\/]|#{wikipediaDisambiguation})/i);
twttr.txt.regexen.validUrlQueryChars = /[a-z0-9!\*'\(\);:&=\+\$\/%#\[\]\-_\.,~]/i;
twttr.txt.regexen.validUrlQueryEndingChars = /[a-z0-9_&=#\/]/i;
twttr.txt.regexen.validUrl = regexSupplant(
'(' + // $1 total match
'(#{validPrecedingChars})' + // $2 Preceeding chracter
'(' + // $3 URL
'(https?:\\/\\/)' + // $4 Protocol
'(#{validDomain})' + // $5 Domain(s) and optional post number
'(\\/' + // $6 URL Path
'(?:' +
'#{validUrlPathChars}+#{validUrlPathEndingChars}|' +
'#{validUrlPathChars}+#{validUrlPathEndingChars}?|' +
'#{validUrlPathEndingChars}' +
')?' +
')?' +
'(\\?#{validUrlQueryChars}*#{validUrlQueryEndingChars})?' + // $7 Query String
')' +
')'
, "gi");
// Default CSS class for auto-linked URLs
var DEFAULT_URL_CLASS = "tweet-url";
// Default CSS class for auto-linked lists (along with the url class)
var DEFAULT_LIST_CLASS = "list-slug";
// Default CSS class for auto-linked usernames (along with the url class)
var DEFAULT_USERNAME_CLASS = "username";
// Default CSS class for auto-linked hashtags (along with the url class)
var DEFAULT_HASHTAG_CLASS = "hashtag";
// HTML attribute for robot nofollow behavior (default)
var HTML_ATTR_NO_FOLLOW = " rel=\"nofollow\"";
// Simple object cloning function for simple objects
function clone(o) {
var r = {};
for (var k in o) {
if (o.hasOwnProperty(k)) {
r[k] = o[k];
}
}
return r;
}
twttr.txt.autoLink = function(text, options) {
options = clone(options || {});
return twttr.txt.autoLinkUsernamesOrLists(
twttr.txt.autoLinkUrlsCustom(
twttr.txt.autoLinkHashtags(text, options),
options),
options);
};
twttr.txt.autoLinkUsernamesOrLists = function(text, options) {
options = clone(options || {});
options.urlClass = options.urlClass || DEFAULT_URL_CLASS;
options.listClass = options.listClass || DEFAULT_LIST_CLASS;
options.usernameClass = options.usernameClass || DEFAULT_USERNAME_CLASS;
options.usernameUrlBase = options.usernameUrlBase || "http://twitter.com/";
options.listUrlBase = options.listUrlBase || "http://twitter.com/";
if (!options.suppressNoFollow) {
var extraHtml = HTML_ATTR_NO_FOLLOW;
}
var newText = "",
splitText = twttr.txt.splitTags(text);
for (var index = 0; index < splitText.length; index++) {
var chunk = splitText[index];
if (index !== 0) {
newText += ((index % 2 === 0) ? ">" : "<");
}
if (index % 4 !== 0) {
newText += chunk;
} else {
newText += chunk.replace(twttr.txt.regexen.autoLinkUsernamesOrLists, function(match, before, at, user, slashListname, offset, chunk) {
var after = chunk.slice(offset + match.length);
var d = {
before: before,
at: at,
user: twttr.txt.htmlEscape(user),
slashListname: twttr.txt.htmlEscape(slashListname),
extraHtml: extraHtml,
chunk: twttr.txt.htmlEscape(chunk)
};
for (var k in options) {
if (options.hasOwnProperty(k)) {
d[k] = options[k];
}
}
if (slashListname && !options.suppressLists) {
// the link is a list
var list = d.chunk = stringSupplant("#{user}#{slashListname}", d);
d.list = twttr.txt.htmlEscape(list.toLowerCase());
return stringSupplant("#{before}#{at}<a class=\"#{urlClass} #{listClass}\" href=\"#{listUrlBase}#{list}\"#{extraHtml}>#{chunk}</a>", d);
} else {
if (after && after.match(twttr.txt.regexen.endScreenNameMatch)) {
// Followed by something that means we don't autolink
return match;
} else {
// this is a screen name
d.chunk = twttr.txt.htmlEscape(user);
d.dataScreenName = !options.suppressDataScreenName ? stringSupplant("data-screen-name=\"#{chunk}\" ", d) : "";
return stringSupplant("#{before}#{at}<a class=\"#{urlClass} #{usernameClass}\" #{dataScreenName}href=\"#{usernameUrlBase}#{chunk}\"#{extraHtml}>#{chunk}</a>", d);
}
}
});
}
}
return newText;
};
twttr.txt.autoLinkHashtags = function(text, options) {
options = clone(options || {});
options.urlClass = options.urlClass || DEFAULT_URL_CLASS;
options.hashtagClass = options.hashtagClass || DEFAULT_HASHTAG_CLASS;
options.hashtagUrlBase = options.hashtagUrlBase || "http://twitter.com/search?q=%23";
if (!options.suppressNoFollow) {
var extraHtml = HTML_ATTR_NO_FOLLOW;
}
return text.replace(twttr.txt.regexen.autoLinkHashtags, function(match, before, hash, text) {
var d = {
before: before,
hash: twttr.txt.htmlEscape(hash),
text: twttr.txt.htmlEscape(text),
extraHtml: extraHtml
};
for (var k in options) {
if (options.hasOwnProperty(k)) {
d[k] = options[k];
}
}
return stringSupplant("#{before}<a href=\"#{hashtagUrlBase}#{text}\" title=\"##{text}\" class=\"#{urlClass} #{hashtagClass}\"#{extraHtml}>#{hash}#{text}</a>", d);
});
};
twttr.txt.autoLinkUrlsCustom = function(text, options) {
options = clone(options || {});
if (!options.suppressNoFollow) {
options.rel = "nofollow";
}
if (options.urlClass) {
options["class"] = options.urlClass;
delete options.urlClass;
}
delete options.suppressNoFollow;
delete options.suppressDataScreenName;
return text.replace(twttr.txt.regexen.validUrl, function(match, all, before, url, protocol, domain, path, queryString) {
var tldComponents;
if (protocol) {
var htmlAttrs = "";
for (var k in options) {
htmlAttrs += stringSupplant(" #{k}=\"#{v}\" ", {k: k, v: options[k].toString().replace(/"/, """).replace(/</, "<").replace(/>/, ">")});
}
options.htmlAttrs || "";
var d = {
before: before,
htmlAttrs: htmlAttrs,
url: twttr.txt.htmlEscape(url)
};
return stringSupplant("#{before}<a href=\"#{url}\"#{htmlAttrs}>#{url}</a>", d);
} else {
return all;
}
});
};
twttr.txt.extractMentions = function(text) {
var screenNamesOnly = [],
screenNamesWithIndices = twttr.txt.extractMentionsWithIndices(text);
for (var i = 0; i < screenNamesWithIndices.length; i++) {
var screenName = screenNamesWithIndices[i].screenName;
screenNamesOnly.push(screenName);
}
return screenNamesOnly;
};
twttr.txt.extractMentionsWithIndices = function(text) {
if (!text) {
return [];
}
var possibleScreenNames = [],
position = 0;
text.replace(twttr.txt.regexen.extractMentions, function(match, before, atSign, screenName, after) {
if (!after.match(twttr.txt.regexen.endScreenNameMatch)) {
var startPosition = text.indexOf(atSign + screenName, position);
position = startPosition + screenName.length + 1;
possibleScreenNames.push({
screenName: screenName,
indices: [startPosition, position]
});
}
});
return possibleScreenNames;
};
twttr.txt.extractReplies = function(text) {
if (!text) {
return null;
}
var possibleScreenName = text.match(twttr.txt.regexen.extractReply);
if (!possibleScreenName) {
return null;
}
return possibleScreenName[1];
};
twttr.txt.extractUrls = function(text) {
var urlsOnly = [],
urlsWithIndices = twttr.txt.extractUrlsWithIndices(text);
for (var i = 0; i < urlsWithIndices.length; i++) {
urlsOnly.push(urlsWithIndices[i].url);
}
return urlsOnly;
};
twttr.txt.extractUrlsWithIndices = function(text) {
if (!text) {
return [];
}
var urls = [],
position = 0;
text.replace(twttr.txt.regexen.validUrl, function(match, all, before, url, protocol, domain, path, query) {
var tldComponents;
if (protocol) {
var startPosition = text.indexOf(url, position),
position = startPosition + url.length;
urls.push({
url: url,
indices: [startPosition, position]
});
}
});
return urls;
};
twttr.txt.extractHashtags = function(text) {
var hashtagsOnly = [],
hashtagsWithIndices = twttr.txt.extractHashtagsWithIndices(text);
for (var i = 0; i < hashtagsWithIndices.length; i++) {
hashtagsOnly.push(hashtagsWithIndices[i].hashtag);
}
return hashtagsOnly;
};
twttr.txt.extractHashtagsWithIndices = function(text) {
if (!text) {
return [];
}
var tags = [],
position = 0;
text.replace(twttr.txt.regexen.autoLinkHashtags, function(match, before, hash, hashText) {
var startPosition = text.indexOf(hash + hashText, position);
position = startPosition + hashText.length + 1;
tags.push({
hashtag: hashText,
indices: [startPosition, position]
});
});
return tags;
};
// this essentially does text.split(/<|>/)
// except that won't work in IE, where empty strings are ommitted
// so "<>".split(/<|>/) => [] in IE, but is ["", "", ""] in all others
// but "<<".split("<") => ["", "", ""]
twttr.txt.splitTags = function(text) {
var firstSplits = text.split("<"),
secondSplits,
allSplits = [],
split;
for (var i = 0; i < firstSplits.length; i += 1) {
split = firstSplits[i];
if (!split) {
allSplits.push("");
} else {
secondSplits = split.split(">");
for (var j = 0; j < secondSplits.length; j += 1) {
allSplits.push(secondSplits[j]);
}
}
}
return allSplits;
};
twttr.txt.hitHighlight = function(text, hits, options) {
var defaultHighlightTag = "em";
hits = hits || [];
options = options || {};
if (hits.length === 0) {
return text;
}
var tagName = options.tag || defaultHighlightTag,
tags = ["<" + tagName + ">", "</" + tagName + ">"],
chunks = twttr.txt.splitTags(text),
split,
i,
j,
result = "",
chunkIndex = 0,
chunk = chunks[0],
prevChunksLen = 0,
chunkCursor = 0,
startInChunk = false,
chunkChars = chunk,
flatHits = [],
index,
hit,
tag,
placed,
hitSpot;
for (i = 0; i < hits.length; i += 1) {
for (j = 0; j < hits[i].length; j += 1) {
flatHits.push(hits[i][j]);
}
}
for (index = 0; index < flatHits.length; index += 1) {
hit = flatHits[index];
tag = tags[index % 2];
placed = false;
while (chunk != null && hit >= prevChunksLen + chunk.length) {
result += chunkChars.slice(chunkCursor);
if (startInChunk && hit === prevChunksLen + chunkChars.length) {
result += tag;
placed = true;
}
if (chunks[chunkIndex + 1]) {
result += "<" + chunks[chunkIndex + 1] + ">";
}
prevChunksLen += chunkChars.length;
chunkCursor = 0;
chunkIndex += 2;
chunk = chunks[chunkIndex];
chunkChars = chunk;
startInChunk = false;
}
if (!placed && chunk != null) {
hitSpot = hit - prevChunksLen;
result += chunkChars.slice(chunkCursor, hitSpot) + tag;
chunkCursor = hitSpot;
if (index % 2 === 0) {
startInChunk = true;
} else {
startInChunk = false;
}
} else if(!placed) {
placed = true;
result += tag;
}
}
if (chunk != null) {
if (chunkCursor < chunkChars.length) {
result += chunkChars.slice(chunkCursor);
}
for (index = chunkIndex + 1; index < chunks.length; index += 1) {
result += (index % 2 === 0 ? chunks[index] : "<" + chunks[index] + ">");
}
}
return result;
};
}());