node/doc/sh_main.js at zlib · tmpvar/node · GitHub

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SHJS - Syntax Highlighting in JavaScript

License: http://shjs.sourceforge.net/doc/gplv3.html

if (! this.sh_languages) {

this.sh_languages = {};

}

var sh_requests = {};

function sh_isEmailAddress(url) {

if (/^mailto:/.test(url)) {

return false;

}

return url.indexOf('@') !== -1;

}

function sh_setHref(tags, numTags, inputString) {

var url = inputString.substring(tags[numTags - 2].pos, tags[numTags - 1].pos);

if (url.length >= 2 && url.charAt(0) === '<' && url.charAt(url.length - 1) === '>') {

url = url.substr(1, url.length - 2);

}

if (sh_isEmailAddress(url)) {

url = 'mailto:' + url;

}

tags[numTags - 2].node.href = url;

}

Konqueror has a bug where the regular expression /$/g will not match at the end

of a line more than once:

var regex = /$/g;

var match;

var line = '1234567890';

regex.lastIndex = 10;

match = regex.exec(line);

var line2 = 'abcde';

regex.lastIndex = 5;

match = regex.exec(line2); // fails

function sh_konquerorExec(s) {

var result = [''];

result.index = s.length;

result.input = s;

return result;

}

/**

Highlights all elements containing source code in a text string. The return

value is an array of objects, each representing an HTML start or end tag. Each

object has a property named pos, which is an integer representing the text

offset of the tag. Every start tag also has a property named node, which is the

DOM element started by the tag. End tags do not have this property.

@param inputString a text string

@param language a language definition object

@return an array of tag objects

function sh_highlightString(inputString, language) {

if (/Konqueror/.test(navigator.userAgent)) {

if (! language.konquered) {

for (var s = 0; s < language.length; s++) {

for (var p = 0; p < language[s].length; p++) {

var r = language[s][p][0];

if (r.source === '$') {

r.exec = sh_konquerorExec;

}

language.konquered = true;

}

var a = document.createElement('a');

var span = document.createElement('span');

// the result

var tags = [];

var numTags = 0;

// each element is a pattern object from language

var patternStack = [];

// the current position within inputString

var pos = 0;

// the name of the current style, or null if there is no current style

var currentStyle = null;

var output = function(s, style) {

var length = s.length;

// this is more than just an optimization - we don't want to output empty <span></span> elements

if (length === 0) {

return;

}

if (! style) {

var stackLength = patternStack.length;

if (stackLength !== 0) {

var pattern = patternStack[stackLength - 1];

// check whether this is a state or an environment

if (! pattern[3]) {

// it's not a state - it's an environment; use the style for this environment

style = pattern[1];

}

if (currentStyle !== style) {

if (currentStyle) {

tags[numTags++] = {pos: pos};

if (currentStyle === 'sh_url') {

sh_setHref(tags, numTags, inputString);

}

if (style) {

var clone;

if (style === 'sh_url') {

clone = a.cloneNode(false);

}

else {

clone = span.cloneNode(false);

}

clone.className = style;

tags[numTags++] = {node: clone, pos: pos};

}

pos += length;

currentStyle = style;

};

var endOfLinePattern = /\r\n|\r|\n/g;

endOfLinePattern.lastIndex = 0;

var inputStringLength = inputString.length;

while (pos < inputStringLength) {

var start = pos;

var end;

var startOfNextLine;

var endOfLineMatch = endOfLinePattern.exec(inputString);

if (endOfLineMatch === null) {

end = inputStringLength;

startOfNextLine = inputStringLength;

}

else {

end = endOfLineMatch.index;

startOfNextLine = endOfLinePattern.lastIndex;

}

var line = inputString.substring(start, end);

var matchCache = [];

for (;;) {

var posWithinLine = pos - start;

var stateIndex;

var stackLength = patternStack.length;

if (stackLength === 0) {

stateIndex = 0;

}

else {

// get the next state

stateIndex = patternStack[stackLength - 1][2];

}

var state = language[stateIndex];

var numPatterns = state.length;

var mc = matchCache[stateIndex];

if (! mc) {

mc = matchCache[stateIndex] = [];

}

var bestMatch = null;

var bestPatternIndex = -1;

for (var i = 0; i < numPatterns; i++) {

var match;

if (i < mc.length && (mc[i] === null || posWithinLine <= mc[i].index)) {

match = mc[i];

}

else {

var regex = state[i][0];

regex.lastIndex = posWithinLine;

match = regex.exec(line);

mc[i] = match;

}

if (match !== null && (bestMatch === null || match.index < bestMatch.index)) {

bestMatch = match;

bestPatternIndex = i;

if (match.index === posWithinLine) {

break;

}

if (bestMatch === null) {

output(line.substring(posWithinLine), null);

break;

}

else {

// got a match

if (bestMatch.index > posWithinLine) {

output(line.substring(posWithinLine, bestMatch.index), null);

}

var pattern = state[bestPatternIndex];

var newStyle = pattern[1];

var matchedString;

if (newStyle instanceof Array) {

for (var subexpression = 0; subexpression < newStyle.length; subexpression++) {

matchedString = bestMatch[subexpression + 1];

output(matchedString, newStyle[subexpression]);

}

else {

matchedString = bestMatch[0];

output(matchedString, newStyle);

}

switch (pattern[2]) {

case -1:

// do nothing

break;

case -2:

// exit

patternStack.pop();

break;

case -3:

// exitall

patternStack.length = 0;

break;

default:

// this was the start of a delimited pattern or a state/environment

patternStack.push(pattern);

break;

}

// end of the line

if (currentStyle) {

tags[numTags++] = {pos: pos};

if (currentStyle === 'sh_url') {

sh_setHref(tags, numTags, inputString);

}

currentStyle = null;

}

pos = startOfNextLine;

}

return tags;

}

////////////////////////////////////////////////////////////////////////////////

// DOM-dependent functions

function sh_getClasses(element) {

var result = [];

var htmlClass = element.className;

if (htmlClass && htmlClass.length > 0) {

var htmlClasses = htmlClass.split(' ');

for (var i = 0; i < htmlClasses.length; i++) {

if (htmlClasses[i].length > 0) {

result.push(htmlClasses[i]);

}

return result;

}

function sh_addClass(element, name) {

var htmlClasses = sh_getClasses(element);

for (var i = 0; i < htmlClasses.length; i++) {

if (name.toLowerCase() === htmlClasses[i].toLowerCase()) {

return;

}

htmlClasses.push(name);

element.className = htmlClasses.join(' ');

}

/**

Extracts the tags from an HTML DOM NodeList.

@param nodeList a DOM NodeList

@param result an object with text, tags and pos properties

function sh_extractTagsFromNodeList(nodeList, result) {

var length = nodeList.length;

for (var i = 0; i < length; i++) {

var node = nodeList.item(i);

switch (node.nodeType) {

case 1:

if (node.nodeName.toLowerCase() === 'br') {

var terminator;

if (/MSIE/.test(navigator.userAgent)) {

terminator = '\r';

}

else {

terminator = '\n';

}

result.text.push(terminator);

result.pos++;

}

else {

result.tags.push({node: node.cloneNode(false), pos: result.pos});

sh_extractTagsFromNodeList(node.childNodes, result);

result.tags.push({pos: result.pos});

}

break;

case 3:

case 4:

result.text.push(node.data);

result.pos += node.length;

break;

}

/**

Extracts the tags from the text of an HTML element. The extracted tags will be

returned as an array of tag objects. See sh_highlightString for the format of

the tag objects.

@param element a DOM element

@param tags an empty array; the extracted tag objects will be returned in it

@return the text of the element

@see sh_highlightString

function sh_extractTags(element, tags) {

var result = {};

result.text = [];

result.tags = tags;

result.pos = 0;

sh_extractTagsFromNodeList(element.childNodes, result);

return result.text.join('');

}

/**

Merges the original tags from an element with the tags produced by highlighting.

@param originalTags an array containing the original tags

@param highlightTags an array containing the highlighting tags - these must not overlap

@result an array containing the merged tags

function sh_mergeTags(originalTags, highlightTags) {

var numOriginalTags = originalTags.length;

if (numOriginalTags === 0) {

return highlightTags;

}

var numHighlightTags = highlightTags.length;

if (numHighlightTags === 0) {

return originalTags;

}

var result = [];

var originalIndex = 0;

var highlightIndex = 0;

while (originalIndex < numOriginalTags && highlightIndex < numHighlightTags) {

var originalTag = originalTags[originalIndex];

var highlightTag = highlightTags[highlightIndex];

if (originalTag.pos <= highlightTag.pos) {

result.push(originalTag);

originalIndex++;

}

else {

result.push(highlightTag);

if (highlightTags[highlightIndex + 1].pos <= originalTag.pos) {

highlightIndex++;

result.push(highlightTags[highlightIndex]);

highlightIndex++;

}

else {

// new end tag

result.push({pos: originalTag.pos});

// new start tag

highlightTags[highlightIndex] = {node: highlightTag.node.cloneNode(false), pos: originalTag.pos};

}

while (originalIndex < numOriginalTags) {

result.push(originalTags[originalIndex]);

originalIndex++;

}

while (highlightIndex < numHighlightTags) {

result.push(highlightTags[highlightIndex]);

highlightIndex++;

}

return result;

}

/**

Inserts tags into text.

@param tags an array of tag objects

@param text a string representing the text

@return a DOM DocumentFragment representing the resulting HTML

function sh_insertTags(tags, text) {

var doc = document;

var result = document.createDocumentFragment();

var tagIndex = 0;

var numTags = tags.length;

var textPos = 0;

var textLength = text.length;

var currentNode = result;

// output one tag or text node every iteration

while (textPos < textLength || tagIndex < numTags) {

var tag;

var tagPos;

if (tagIndex < numTags) {

tag = tags[tagIndex];

tagPos = tag.pos;

}

else {

tagPos = textLength;

}

if (tagPos <= textPos) {

// output the tag

if (tag.node) {

// start tag

var newNode = tag.node;

currentNode.appendChild(newNode);

currentNode = newNode;

}

else {

// end tag

currentNode = currentNode.parentNode;

}

tagIndex++;

}

else {

// output text

currentNode.appendChild(doc.createTextNode(text.substring(textPos, tagPos)));

textPos = tagPos;

}

return result;

}

/**

Highlights an element containing source code. Upon completion of this function,

the element will have been placed in the "sh_sourceCode" class.

@param element a DOM <pre> element containing the source code to be highlighted

@param language a language definition object

function sh_highlightElement(element, language) {

sh_addClass(element, 'sh_sourceCode');

var originalTags = [];

var inputString = sh_extractTags(element, originalTags);

var highlightTags = sh_highlightString(inputString, language);

var tags = sh_mergeTags(originalTags, highlightTags);

var documentFragment = sh_insertTags(tags, inputString);

while (element.hasChildNodes()) {

element.removeChild(element.firstChild);

}

element.appendChild(documentFragment);

}

function sh_getXMLHttpRequest() {

if (window.ActiveXObject) {

return new ActiveXObject('Msxml2.XMLHTTP');

}

else if (window.XMLHttpRequest) {

return new XMLHttpRequest();

}

throw 'No XMLHttpRequest implementation available';

}

function sh_load(language, element, prefix, suffix) {

if (language in sh_requests) {

sh_requests[language].push(element);

return;

}

sh_requests[language] = [element];

var request = sh_getXMLHttpRequest();

var url = prefix + 'sh_' + language + suffix;

request.open('GET', url, true);

request.onreadystatechange = function () {

if (request.readyState === 4) {

try {

if (! request.status || request.status === 200) {

eval(request.responseText);

var elements = sh_requests[language];

for (var i = 0; i < elements.length; i++) {

sh_highlightElement(elements[i], sh_languages[language]);

}

else {

throw 'HTTP error: status ' + request.status;

}

finally {

request = null;

}

};

request.send(null);

}

/**

Highlights all elements containing source code on the current page. Elements

containing source code must be "pre" elements with a "class" attribute of

"sh_LANGUAGE", where LANGUAGE is a valid language identifier; e.g., "sh_java"

identifies the element as containing "java" language source code.

function highlight(prefix, suffix, tag) {

var nodeList = document.getElementsByTagName(tag);

for (var i = 0; i < nodeList.length; i++) {

var element = nodeList.item(i);

var htmlClasses = sh_getClasses(element);

var highlighted = false;

var donthighlight = false;

for (var j = 0; j < htmlClasses.length; j++) {

var htmlClass = htmlClasses[j].toLowerCase();

if (htmlClass === 'sh_none') {

donthighlight = true

continue;

}

if (htmlClass.substr(0, 3) === 'sh_') {

var language = htmlClass.substring(3);

if (language in sh_languages) {

sh_highlightElement(element, sh_languages[language]);

highlighted = true;

}

else if (typeof(prefix) === 'string' && typeof(suffix) === 'string') {

sh_load(language, element, prefix, suffix);

}

else {

throw 'Found <' + tag + '> element with class="' + htmlClass + '", but no such language exists';

}

break;

}

if (highlighted === false && donthighlight == false) {

sh_highlightElement(element, sh_languages["javascript"]);

}

function sh_highlightDocument(prefix, suffix) {

highlight(prefix, suffix, 'tt');

highlight(prefix, suffix, 'code');

highlight(prefix, suffix, 'pre');

}

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