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javascript.js
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Sun, Sep 28, 10:03 PM

javascript.js
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// TODO actually recognize syntax of TypeScript constructs
CodeMirror.defineMode("javascript", function(config, parserConfig) {
var indentUnit = config.indentUnit;
var statementIndent = parserConfig.statementIndent;
var jsonMode = parserConfig.json;
var isTS = parserConfig.typescript;
// Tokenizer
var keywords = function(){
function kw(type) {return {type: type, style: "keyword"};}
var A = kw("keyword a"), B = kw("keyword b"), C = kw("keyword c");
var operator = kw("operator"), atom = {type: "atom", style: "atom"};
var jsKeywords = {
"if": kw("if"), "while": A, "with": A, "else": B, "do": B, "try": B, "finally": B,
"return": C, "break": C, "continue": C, "new": C, "delete": C, "throw": C,
"var": kw("var"), "const": kw("var"), "let": kw("var"),
"function": kw("function"), "catch": kw("catch"),
"for": kw("for"), "switch": kw("switch"), "case": kw("case"), "default": kw("default"),
"in": operator, "typeof": operator, "instanceof": operator,
"true": atom, "false": atom, "null": atom, "undefined": atom, "NaN": atom, "Infinity": atom,
"this": kw("this")
};
// Extend the 'normal' keywords with the TypeScript language extensions
if (isTS) {
var type = {type: "variable", style: "variable-3"};
var tsKeywords = {
// object-like things
"interface": kw("interface"),
"class": kw("class"),
"extends": kw("extends"),
"constructor": kw("constructor"),
// scope modifiers
"public": kw("public"),
"private": kw("private"),
"protected": kw("protected"),
"static": kw("static"),
"super": kw("super"),
// types
"string": type, "number": type, "bool": type, "any": type
};
for (var attr in tsKeywords) {
jsKeywords[attr] = tsKeywords[attr];
}
}
return jsKeywords;
}();
var isOperatorChar = /[+\-*&%=<>!?|~^]/;
function chain(stream, state, f) {
state.tokenize = f;
return f(stream, state);
}
function nextUntilUnescaped(stream, end) {
var escaped = false, next;
while ((next = stream.next()) != null) {
if (next == end && !escaped)
return false;
escaped = !escaped && next == "\\";
}
return escaped;
}
// Used as scratch variables to communicate multiple values without
// consing up tons of objects.
var type, content;
function ret(tp, style, cont) {
type = tp; content = cont;
return style;
}
function jsTokenBase(stream, state) {
var ch = stream.next();
if (ch == '"' || ch == "'")
return chain(stream, state, jsTokenString(ch));
else if (/[\[\]{}\(\),;\:\.]/.test(ch))
return ret(ch);
else if (ch == "0" && stream.eat(/x/i)) {
stream.eatWhile(/[\da-f]/i);
return ret("number", "number");
}
else if (/\d/.test(ch) || ch == "-" && stream.eat(/\d/)) {
stream.match(/^\d*(?:\.\d*)?(?:[eE][+\-]?\d+)?/);
return ret("number", "number");
}
else if (ch == "/") {
if (stream.eat("*")) {
return chain(stream, state, jsTokenComment);
}
else if (stream.eat("/")) {
stream.skipToEnd();
return ret("comment", "comment");
}
else if (state.lastType == "operator" || state.lastType == "keyword c" ||
/^[\[{}\(,;:]$/.test(state.lastType)) {
nextUntilUnescaped(stream, "/");
stream.eatWhile(/[gimy]/); // 'y' is "sticky" option in Mozilla
return ret("regexp", "string-2");
}
else {
stream.eatWhile(isOperatorChar);
return ret("operator", null, stream.current());
}
}
else if (ch == "#") {
stream.skipToEnd();
return ret("error", "error");
}
else if (isOperatorChar.test(ch)) {
stream.eatWhile(isOperatorChar);
return ret("operator", null, stream.current());
}
else {
stream.eatWhile(/[\w\$_]/);
var word = stream.current(), known = keywords.propertyIsEnumerable(word) && keywords[word];
return (known && state.lastType != ".") ? ret(known.type, known.style, word) :
ret("variable", "variable", word);
}
}
function jsTokenString(quote) {
return function(stream, state) {
if (!nextUntilUnescaped(stream, quote))
state.tokenize = jsTokenBase;
return ret("string", "string");
};
}
function jsTokenComment(stream, state) {
var maybeEnd = false, ch;
while (ch = stream.next()) {
if (ch == "/" && maybeEnd) {
state.tokenize = jsTokenBase;
break;
}
maybeEnd = (ch == "*");
}
return ret("comment", "comment");
}
// Parser
var atomicTypes = {"atom": true, "number": true, "variable": true, "string": true, "regexp": true, "this": true};
function JSLexical(indented, column, type, align, prev, info) {
this.indented = indented;
this.column = column;
this.type = type;
this.prev = prev;
this.info = info;
if (align != null) this.align = align;
}
function inScope(state, varname) {
for (var v = state.localVars; v; v = v.next)
if (v.name == varname) return true;
}
function parseJS(state, style, type, content, stream) {
var cc = state.cc;
// Communicate our context to the combinators.
// (Less wasteful than consing up a hundred closures on every call.)
cx.state = state; cx.stream = stream; cx.marked = null, cx.cc = cc;
if (!state.lexical.hasOwnProperty("align"))
state.lexical.align = true;
while(true) {
var combinator = cc.length ? cc.pop() : jsonMode ? expression : statement;
if (combinator(type, content)) {
while(cc.length && cc[cc.length - 1].lex)
cc.pop()();
if (cx.marked) return cx.marked;
if (type == "variable" && inScope(state, content)) return "variable-2";
return style;
}
}
}
// Combinator utils
var cx = {state: null, column: null, marked: null, cc: null};
function pass() {
for (var i = arguments.length - 1; i >= 0; i--) cx.cc.push(arguments[i]);
}
function cont() {
pass.apply(null, arguments);
return true;
}
function register(varname) {
function inList(list) {
for (var v = list; v; v = v.next)
if (v.name == varname) return true;
return false;
}
var state = cx.state;
if (state.context) {
cx.marked = "def";
if (inList(state.localVars)) return;
state.localVars = {name: varname, next: state.localVars};
} else {
if (inList(state.globalVars)) return;
state.globalVars = {name: varname, next: state.globalVars};
}
}
// Combinators
var defaultVars = {name: "this", next: {name: "arguments"}};
function pushcontext() {
cx.state.context = {prev: cx.state.context, vars: cx.state.localVars};
cx.state.localVars = defaultVars;
}
function popcontext() {
cx.state.localVars = cx.state.context.vars;
cx.state.context = cx.state.context.prev;
}
function pushlex(type, info) {
var result = function() {
var state = cx.state, indent = state.indented;
if (state.lexical.type == "stat") indent = state.lexical.indented;
state.lexical = new JSLexical(indent, cx.stream.column(), type, null, state.lexical, info);
};
result.lex = true;
return result;
}
function poplex() {
var state = cx.state;
if (state.lexical.prev) {
if (state.lexical.type == ")")
state.indented = state.lexical.indented;
state.lexical = state.lexical.prev;
}
}
poplex.lex = true;
function expect(wanted) {
return function(type) {
if (type == wanted) return cont();
else if (wanted == ";") return pass();
else return cont(arguments.callee);
};
}
function statement(type) {
if (type == "var") return cont(pushlex("vardef"), vardef1, expect(";"), poplex);
if (type == "keyword a") return cont(pushlex("form"), expression, statement, poplex);
if (type == "keyword b") return cont(pushlex("form"), statement, poplex);
if (type == "{") return cont(pushlex("}"), block, poplex);
if (type == ";") return cont();
if (type == "if") return cont(pushlex("form"), expression, statement, poplex, maybeelse(cx.state.indented));
if (type == "function") return cont(functiondef);
if (type == "for") return cont(pushlex("form"), expect("("), pushlex(")"), forspec1, expect(")"),
poplex, statement, poplex);
if (type == "variable") return cont(pushlex("stat"), maybelabel);
if (type == "switch") return cont(pushlex("form"), expression, pushlex("}", "switch"), expect("{"),
block, poplex, poplex);
if (type == "case") return cont(expression, expect(":"));
if (type == "default") return cont(expect(":"));
if (type == "catch") return cont(pushlex("form"), pushcontext, expect("("), funarg, expect(")"),
statement, poplex, popcontext);
return pass(pushlex("stat"), expression, expect(";"), poplex);
}
function expression(type) {
return expressionInner(type, false);
}
function expressionNoComma(type) {
return expressionInner(type, true);
}
function expressionInner(type, noComma) {
var maybeop = noComma ? maybeoperatorNoComma : maybeoperatorComma;
if (atomicTypes.hasOwnProperty(type)) return cont(maybeop);
if (type == "function") return cont(functiondef);
if (type == "keyword c") return cont(noComma ? maybeexpressionNoComma : maybeexpression);
if (type == "(") return cont(pushlex(")"), maybeexpression, expect(")"), poplex, maybeop);
if (type == "operator") return cont(noComma ? expressionNoComma : expression);
if (type == "[") return cont(pushlex("]"), commasep(expressionNoComma, "]"), poplex, maybeop);
if (type == "{") return cont(pushlex("}"), commasep(objprop, "}"), poplex, maybeop);
return cont();
}
function maybeexpression(type) {
if (type.match(/[;\}\)\],]/)) return pass();
return pass(expression);
}
function maybeexpressionNoComma(type) {
if (type.match(/[;\}\)\],]/)) return pass();
return pass(expressionNoComma);
}
function maybeoperatorComma(type, value) {
if (type == ",") return cont(expression);
return maybeoperatorNoComma(type, value, maybeoperatorComma);
}
function maybeoperatorNoComma(type, value, me) {
if (!me) me = maybeoperatorNoComma;
if (type == "operator") {
if (/\+\+|--/.test(value)) return cont(me);
if (value == "?") return cont(expression, expect(":"), expression);
return cont(expression);
}
if (type == ";") return;
if (type == "(") return cont(pushlex(")", "call"), commasep(expressionNoComma, ")"), poplex, me);
if (type == ".") return cont(property, me);
if (type == "[") return cont(pushlex("]"), expression, expect("]"), poplex, me);
}
function maybelabel(type) {
if (type == ":") return cont(poplex, statement);
return pass(maybeoperatorComma, expect(";"), poplex);
}
function property(type) {
if (type == "variable") {cx.marked = "property"; return cont();}
}
function objprop(type, value) {
if (type == "variable") {
cx.marked = "property";
if (value == "get" || value == "set") return cont(getterSetter);
} else if (type == "number" || type == "string") {
cx.marked = type + " property";
}
if (atomicTypes.hasOwnProperty(type)) return cont(expect(":"), expressionNoComma);
}
function getterSetter(type) {
if (type == ":") return cont(expression);
if (type != "variable") return cont(expect(":"), expression);
cx.marked = "property";
return cont(functiondef);
}
function commasep(what, end) {
function proceed(type) {
if (type == ",") {
var lex = cx.state.lexical;
if (lex.info == "call") lex.pos = (lex.pos || 0) + 1;
return cont(what, proceed);
}
if (type == end) return cont();
return cont(expect(end));
}
return function(type) {
if (type == end) return cont();
else return pass(what, proceed);
};
}
function block(type) {
if (type == "}") return cont();
return pass(statement, block);
}
function maybetype(type) {
if (type == ":") return cont(typedef);
return pass();
}
function typedef(type) {
if (type == "variable"){cx.marked = "variable-3"; return cont();}
return pass();
}
function vardef1(type, value) {
if (type == "variable") {
register(value);
return isTS ? cont(maybetype, vardef2) : cont(vardef2);
}
return pass();
}
function vardef2(type, value) {
if (value == "=") return cont(expressionNoComma, vardef2);
if (type == ",") return cont(vardef1);
}
function maybeelse(indent) {
return function(type, value) {
if (type == "keyword b" && value == "else") {
cx.state.lexical = new JSLexical(indent, 0, "form", null, cx.state.lexical);
return cont(statement, poplex);
}
return pass();
};
}
function forspec1(type) {
if (type == "var") return cont(vardef1, expect(";"), forspec2);
if (type == ";") return cont(forspec2);
if (type == "variable") return cont(formaybein);
return pass(expression, expect(";"), forspec2);
}
function formaybein(_type, value) {
if (value == "in") return cont(expression);
return cont(maybeoperatorComma, forspec2);
}
function forspec2(type, value) {
if (type == ";") return cont(forspec3);
if (value == "in") return cont(expression);
return pass(expression, expect(";"), forspec3);
}
function forspec3(type) {
if (type != ")") cont(expression);
}
function functiondef(type, value) {
if (type == "variable") {register(value); return cont(functiondef);}
if (type == "(") return cont(pushlex(")"), pushcontext, commasep(funarg, ")"), poplex, statement, popcontext);
}
function funarg(type, value) {
if (type == "variable") {register(value); return isTS ? cont(maybetype) : cont();}
}
// Interface
return {
startState: function(basecolumn) {
return {
tokenize: jsTokenBase,
lastType: null,
cc: [],
lexical: new JSLexical((basecolumn || 0) - indentUnit, 0, "block", false),
localVars: parserConfig.localVars,
globalVars: parserConfig.globalVars,
context: parserConfig.localVars && {vars: parserConfig.localVars},
indented: 0
};
},
token: function(stream, state) {
if (stream.sol()) {
if (!state.lexical.hasOwnProperty("align"))
state.lexical.align = false;
state.indented = stream.indentation();
}
if (state.tokenize != jsTokenComment && stream.eatSpace()) return null;
var style = state.tokenize(stream, state);
if (type == "comment") return style;
state.lastType = type == "operator" && (content == "++" || content == "--") ? "incdec" : type;
return parseJS(state, style, type, content, stream);
},
indent: function(state, textAfter) {
if (state.tokenize == jsTokenComment) return CodeMirror.Pass;
if (state.tokenize != jsTokenBase) return 0;
var firstChar = textAfter && textAfter.charAt(0), lexical = state.lexical;
if (lexical.type == "stat" && firstChar == "}") lexical = lexical.prev;
if (statementIndent && lexical.type == ")" && lexical.prev.type == "stat")
lexical = lexical.prev;
var type = lexical.type, closing = firstChar == type;
if (type == "vardef") return lexical.indented + (state.lastType == "operator" || state.lastType == "," ? 4 : 0);
else if (type == "form" && firstChar == "{") return lexical.indented;
else if (type == "form") return lexical.indented + indentUnit;
else if (type == "stat")
return lexical.indented + (state.lastType == "operator" || state.lastType == "," ? statementIndent || indentUnit : 0);
else if (lexical.info == "switch" && !closing && parserConfig.doubleIndentSwitch != false)
return lexical.indented + (/^(?:case|default)\b/.test(textAfter) ? indentUnit : 2 * indentUnit);
else if (lexical.align) return lexical.column + (closing ? 0 : 1);
else return lexical.indented + (closing ? 0 : indentUnit);
},
electricChars: ":{}",
blockCommentStart: jsonMode ? null : "/*",
blockCommentEnd: jsonMode ? null : "*/",
lineComment: jsonMode ? null : "//",
jsonMode: jsonMode
};
});
CodeMirror.defineMIME("text/javascript", "javascript");
CodeMirror.defineMIME("text/ecmascript", "javascript");
CodeMirror.defineMIME("application/javascript", "javascript");
CodeMirror.defineMIME("application/ecmascript", "javascript");
CodeMirror.defineMIME("application/json", {name: "javascript", json: true});
CodeMirror.defineMIME("application/x-json", {name: "javascript", json: true});
CodeMirror.defineMIME("text/typescript", { name: "javascript", typescript: true });
CodeMirror.defineMIME("application/typescript", { name: "javascript", typescript: true });

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