DevTools: [CodeMirror] Add syntax highlighting for some other languages.

Source/devtools/front_end/cm/python.js

+CodeMirror.defineMode("python", function(conf, parserConf) {
+    var ERRORCLASS = 'error';
+
+    function wordRegexp(words) {
+        return new RegExp("^((" + words.join(")|(") + "))\\b");
+    }
+
+    var singleOperators = parserConf.singleOperators || new RegExp("^[\\+\\-\\*/%&|\\^~<>!]");
+    var singleDelimiters = parserConf.singleDelimiters || new RegExp('^[\\(\\)\\[\\]\\{\\}@,:`=;\\.]');
+    var doubleOperators = parserConf.doubleOperators || new RegExp("^((==)|(!=)|(<=)|(>=)|(<>)|(<<)|(>>)|(//)|(\\*\\*))");
+    var doubleDelimiters = parserConf.doubleDelimiters || new RegExp("^((\\+=)|(\\-=)|(\\*=)|(%=)|(/=)|(&=)|(\\|=)|(\\^=))");
+    var tripleDelimiters = parserConf.tripleDelimiters || new RegExp("^((//=)|(>>=)|(<<=)|(\\*\\*=))");
+    var identifiers = parserConf.identifiers|| new RegExp("^[_A-Za-z][_A-Za-z0-9]*");
+
+    var wordOperators = wordRegexp(['and', 'or', 'not', 'is', 'in']);
+    var commonkeywords = ['as', 'assert', 'break', 'class', 'continue',
+                          'def', 'del', 'elif', 'else', 'except', 'finally',
+                          'for', 'from', 'global', 'if', 'import',
+                          'lambda', 'pass', 'raise', 'return',
+                          'try', 'while', 'with', 'yield'];
+    var commonBuiltins = ['abs', 'all', 'any', 'bin', 'bool', 'bytearray', 'callable', 'chr',
+                          'classmethod', 'compile', 'complex', 'delattr', 'dict', 'dir', 'divmod',
+                          'enumerate', 'eval', 'filter', 'float', 'format', 'frozenset',
+                          'getattr', 'globals', 'hasattr', 'hash', 'help', 'hex', 'id',
+                          'input', 'int', 'isinstance', 'issubclass', 'iter', 'len',
+                          'list', 'locals', 'map', 'max', 'memoryview', 'min', 'next',
+                          'object', 'oct', 'open', 'ord', 'pow', 'property', 'range',
+                          'repr', 'reversed', 'round', 'set', 'setattr', 'slice',
+                          'sorted', 'staticmethod', 'str', 'sum', 'super', 'tuple',
+                          'type', 'vars', 'zip', '__import__', 'NotImplemented',
+                          'Ellipsis', '__debug__'];
+    var py2 = {'builtins': ['apply', 'basestring', 'buffer', 'cmp', 'coerce', 'execfile',
+                            'file', 'intern', 'long', 'raw_input', 'reduce', 'reload',
+                            'unichr', 'unicode', 'xrange', 'False', 'True', 'None'],
+               'keywords': ['exec', 'print']};
+    var py3 = {'builtins': ['ascii', 'bytes', 'exec', 'print'],
+               'keywords': ['nonlocal', 'False', 'True', 'None']};
+
+    if (!!parserConf.version && parseInt(parserConf.version, 10) === 3) {
+        commonkeywords = commonkeywords.concat(py3.keywords);
+        commonBuiltins = commonBuiltins.concat(py3.builtins);
+        var stringPrefixes = new RegExp("^(([rb]|(br))?('{3}|\"{3}|['\"]))", "i");
+    } else {
+        commonkeywords = commonkeywords.concat(py2.keywords);
+        commonBuiltins = commonBuiltins.concat(py2.builtins);
+        var stringPrefixes = new RegExp("^(([rub]|(ur)|(br))?('{3}|\"{3}|['\"]))", "i");
+    }
+    var keywords = wordRegexp(commonkeywords);
+    var builtins = wordRegexp(commonBuiltins);
+
+    var indentInfo = null;
+
+    // tokenizers
+    function tokenBase(stream, state) {
+        // Handle scope changes
+        if (stream.sol()) {
+            var scopeOffset = state.scopes[0].offset;
+            if (stream.eatSpace()) {
+                var lineOffset = stream.indentation();
+                if (lineOffset > scopeOffset) {
+                    indentInfo = 'indent';
+                } else if (lineOffset < scopeOffset) {
+                    indentInfo = 'dedent';
+                }
+                return null;
+            } else {
+                if (scopeOffset > 0) {
+                    dedent(stream, state);
+                }
+            }
+        }
+        if (stream.eatSpace()) {
+            return null;
+        }
+
+        var ch = stream.peek();
+
+        // Handle Comments
+        if (ch === '#') {
+            stream.skipToEnd();
+            return 'comment';
+        }
+
+        // Handle Number Literals
+        if (stream.match(/^[0-9\.]/, false)) {
+            var floatLiteral = false;
+            // Floats
+            if (stream.match(/^\d*\.\d+(e[\+\-]?\d+)?/i)) { floatLiteral = true; }
+            if (stream.match(/^\d+\.\d*/)) { floatLiteral = true; }
+            if (stream.match(/^\.\d+/)) { floatLiteral = true; }
+            if (floatLiteral) {
+                // Float literals may be "imaginary"
+                stream.eat(/J/i);
+                return 'number';
+            }
+            // Integers
+            var intLiteral = false;
+            // Hex
+            if (stream.match(/^0x[0-9a-f]+/i)) { intLiteral = true; }
+            // Binary
+            if (stream.match(/^0b[01]+/i)) { intLiteral = true; }
+            // Octal
+            if (stream.match(/^0o[0-7]+/i)) { intLiteral = true; }
+            // Decimal
+            if (stream.match(/^[1-9]\d*(e[\+\-]?\d+)?/)) {
+                // Decimal literals may be "imaginary"
+                stream.eat(/J/i);
+                // TODO - Can you have imaginary longs?
+                intLiteral = true;
+            }
+            // Zero by itself with no other piece of number.
+            if (stream.match(/^0(?![\dx])/i)) { intLiteral = true; }
+            if (intLiteral) {
+                // Integer literals may be "long"
+                stream.eat(/L/i);
+                return 'number';
+            }
+        }
+
+        // Handle Strings
+        if (stream.match(stringPrefixes)) {
+            state.tokenize = tokenStringFactory(stream.current());
+            return state.tokenize(stream, state);
+        }
+
+        // Handle operators and Delimiters
+        if (stream.match(tripleDelimiters) || stream.match(doubleDelimiters)) {
+            return null;
+        }
+        if (stream.match(doubleOperators)
+            || stream.match(singleOperators)
+            || stream.match(wordOperators)) {
+            return 'operator';
+        }
+        if (stream.match(singleDelimiters)) {
+            return null;
+        }
+
+        if (stream.match(keywords)) {
+            return 'keyword';
+        }
+
+        if (stream.match(builtins)) {
+            return 'builtin';
+        }
+
+        if (stream.match(identifiers)) {
+            return 'variable';
+        }
+
+        // Handle non-detected items
+        stream.next();
+        return ERRORCLASS;
+    }
+
+    function tokenStringFactory(delimiter) {
+        while ('rub'.indexOf(delimiter.charAt(0).toLowerCase()) >= 0) {
+            delimiter = delimiter.substr(1);
+        }
+        var singleline = delimiter.length == 1;
+        var OUTCLASS = 'string';
+
+        function tokenString(stream, state) {
+            while (!stream.eol()) {
+                stream.eatWhile(/[^'"\\]/);
+                if (stream.eat('\\')) {
+                    stream.next();
+                    if (singleline && stream.eol()) {
+                        return OUTCLASS;
+                    }
+                } else if (stream.match(delimiter)) {
+                    state.tokenize = tokenBase;
+                    return OUTCLASS;
+                } else {
+                    stream.eat(/['"]/);
+                }
+            }
+            if (singleline) {
+                if (parserConf.singleLineStringErrors) {
+                    return ERRORCLASS;
+                } else {
+                    state.tokenize = tokenBase;
+                }
+            }
+            return OUTCLASS;
+        }
+        tokenString.isString = true;
+        return tokenString;
+    }
+
+    function indent(stream, state, type) {
+        type = type || 'py';
+        var indentUnit = 0;
+        if (type === 'py') {
+            if (state.scopes[0].type !== 'py') {
+                state.scopes[0].offset = stream.indentation();
+                return;
+            }
+            for (var i = 0; i < state.scopes.length; ++i) {
+                if (state.scopes[i].type === 'py') {
+                    indentUnit = state.scopes[i].offset + conf.indentUnit;
+                    break;
+                }
+            }
+        } else {
+            indentUnit = stream.column() + stream.current().length;
+        }
+        state.scopes.unshift({
+            offset: indentUnit,
+            type: type
+        });
+    }
+
+    function dedent(stream, state, type) {
+        type = type || 'py';
+        if (state.scopes.length == 1) return;
+        if (state.scopes[0].type === 'py') {
+            var _indent = stream.indentation();
+            var _indent_index = -1;
+            for (var i = 0; i < state.scopes.length; ++i) {
+                if (_indent === state.scopes[i].offset) {
+                    _indent_index = i;
+                    break;
+                }
+            }
+            if (_indent_index === -1) {
+                return true;
+            }
+            while (state.scopes[0].offset !== _indent) {
+                state.scopes.shift();
+            }
+            return false;
+        } else {
+            if (type === 'py') {
+                state.scopes[0].offset = stream.indentation();
+                return false;
+            } else {
+                if (state.scopes[0].type != type) {
+                    return true;
+                }
+                state.scopes.shift();
+                return false;
+            }
+        }
+    }
+
+    function tokenLexer(stream, state) {
+        indentInfo = null;
+        var style = state.tokenize(stream, state);
+        var current = stream.current();
+
+        // Handle '.' connected identifiers
+        if (current === '.') {
+            style = stream.match(identifiers, false) ? null : ERRORCLASS;
+            if (style === null && state.lastToken === 'meta') {
+                // Apply 'meta' style to '.' connected identifiers when
+                // appropriate.
+                style = 'meta';
+            }
+            return style;
+        }
+
+        // Handle decorators
+        if (current === '@') {
+            return stream.match(identifiers, false) ? 'meta' : ERRORCLASS;
+        }
+
+        if ((style === 'variable' || style === 'builtin')
+            && state.lastToken === 'meta') {
+            style = 'meta';
+        }
+
+        // Handle scope changes.
+        if (current === 'pass' || current === 'return') {
+            state.dedent += 1;
+        }
+        if (current === 'lambda') state.lambda = true;
+        if ((current === ':' && !state.lambda && state.scopes[0].type == 'py')
+            || indentInfo === 'indent') {
+            indent(stream, state);
+        }
+        var delimiter_index = '[({'.indexOf(current);
+        if (delimiter_index !== -1) {
+            indent(stream, state, '])}'.slice(delimiter_index, delimiter_index+1));
+        }
+        if (indentInfo === 'dedent') {
+            if (dedent(stream, state)) {
+                return ERRORCLASS;
+            }
+        }
+        delimiter_index = '])}'.indexOf(current);
+        if (delimiter_index !== -1) {
+            if (dedent(stream, state, current)) {
+                return ERRORCLASS;
+            }
+        }
+        if (state.dedent > 0 && stream.eol() && state.scopes[0].type == 'py') {
+            if (state.scopes.length > 1) state.scopes.shift();
+            state.dedent -= 1;
+        }
+
+        return style;
+    }
+
+    var external = {
+        startState: function(basecolumn) {
+            return {
+              tokenize: tokenBase,
+              scopes: [{offset:basecolumn || 0, type:'py'}],
+              lastToken: null,
+              lambda: false,
+              dedent: 0
+          };
+        },
+
+        token: function(stream, state) {
+            var style = tokenLexer(stream, state);
+
+            state.lastToken = style;
+
+            if (stream.eol() && stream.lambda) {
+                state.lambda = false;
+            }
+
+            return style;
+        },
+
+        indent: function(state) {
+            if (state.tokenize != tokenBase) {
+                return state.tokenize.isString ? CodeMirror.Pass : 0;
+            }
+
+            return state.scopes[0].offset;
+        },
+
+        lineComment: "#"
+    };
+    return external;
+});
+
+CodeMirror.defineMIME("text/x-python", "python");