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CodeMirror.defineMode("gfm", function(config, parserConfig) {
var mdMode = CodeMirror.getMode(config, "markdown");
var aliases = {
html: "htmlmixed",
js: "javascript",
json: "application/json",
c: "text/x-csrc",
"c++": "text/x-c++src",
java: "text/x-java",
csharp: "text/x-csharp",
"c#": "text/x-csharp"
};
// make this lazy so that we don't need to load GFM last
var getMode = (function () {
var i, modes = {}, mimes = {}, mime;
var list = CodeMirror.listModes();
for (i = 0; i < list.length; i++) {
modes[list[i]] = list[i];
}
var mimesList = CodeMirror.listMIMEs();
for (i = 0; i < mimesList.length; i++) {
mime = mimesList[i].mime;
mimes[mime] = mimesList[i].mime;
}
for (var a in aliases) {
if (aliases[a] in modes || aliases[a] in mimes)
modes[a] = aliases[a];
}
return function (lang) {
return modes[lang] ? CodeMirror.getMode(config, modes[lang]) : null;
}
}());
function markdown(stream, state) {
// intercept fenced code blocks
if (stream.sol() && stream.match(/^```([\w+#]*)/)) {
// try switching mode
state.localMode = getMode(RegExp.$1)
if (state.localMode)
state.localState = state.localMode.startState();
state.token = local;
return 'code';
}
return mdMode.token(stream, state.mdState);
}
function local(stream, state) {
if (stream.sol() && stream.match(/^```/)) {
state.localMode = state.localState = null;
state.token = markdown;
return 'code';
}
else if (state.localMode) {
return state.localMode.token(stream, state.localState);
} else {
stream.skipToEnd();
return 'code';
}
}
// custom handleText to prevent emphasis in the middle of a word
// and add autolinking
function handleText(stream, mdState) {
var match;
if (stream.match(/^\w+:\/\/\S+/)) {
return 'link';
}
if (stream.match(/^[^\[*\\<>` _][^\[*\\<>` ]*[^\[*\\<>` _]/)) {
return mdMode.getType(mdState);
}
if (match = stream.match(/^[^\[*\\<>` ]+/)) {
var word = match[0];
if (word[0] === '_' && word[word.length-1] === '_') {
stream.backUp(word.length);
return undefined;
}
return mdMode.getType(mdState);
}
if (stream.eatSpace()) {
return null;
}
}
return {
startState: function() {
var mdState = mdMode.startState();
mdState.text = handleText;
return {token: markdown, mode: "markdown", mdState: mdState,
localMode: null, localState: null};
},
copyState: function(state) {
return {token: state.token, mode: state.mode, mdState: CodeMirror.copyState(mdMode, state.mdState),
localMode: state.localMode,
localState: state.localMode ? CodeMirror.copyState(state.localMode, state.localState) : null};
},
token: function(stream, state) {
/* Parse GFM double bracket links */
if ((ch = stream.peek()) != undefined && ch == '[') {
stream.next(); // Advance the stream
/* Only handle double bracket links */
if ((ch = stream.peek()) == undefined || ch != '[') {
stream.backUp(1);
return state.token(stream, state);
}
while ((ch = stream.next()) != undefined && ch != ']') {}
if (ch == ']' && (ch = stream.next()) != undefined && ch == ']')
return 'link';
/* If we did not find the second ']' */
stream.backUp(1);
}
/* Match GFM latex formulas, as well as latex formulas within '$' */
if (stream.match(/^\$[^\$]+\$/)) {
return "string";
}
if (stream.match(/^\\\((.*?)\\\)/)) {
return "string";
}
if (stream.match(/^\$\$[^\$]+\$\$/)) {
return "string";
}
if (stream.match(/^\\\[(.*?)\\\]/)) {
return "string";
}
return state.token(stream, state);
}
}
}, "markdown");
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