JavaScript mode
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// Demo code (the actual new parser character stream implementation)
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function StringStream(string) {
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this.pos = 0;
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this.string = string;
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}
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StringStream.prototype = {
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done: function() {return this.pos >= this.string.length;},
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peek: function() {return this.string.charAt(this.pos);},
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next: function() {
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if (this.pos < this.string.length)
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return this.string.charAt(this.pos++);
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},
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eat: function(match) {
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var ch = this.string.charAt(this.pos);
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if (typeof match == "string") var ok = ch == match;
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else var ok = ch && match.test ? match.test(ch) : match(ch);
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if (ok) {this.pos++; return ch;}
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},
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eatWhile: function(match) {
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var start = this.pos;
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while (this.eat(match));
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if (this.pos > start) return this.string.slice(start, this.pos);
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},
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backUp: function(n) {this.pos -= n;},
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column: function() {return this.pos;},
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eatSpace: function() {
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var start = this.pos;
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while (/\s/.test(this.string.charAt(this.pos))) this.pos++;
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return this.pos - start;
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},
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match: function(pattern, consume, caseInsensitive) {
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if (typeof pattern == "string") {
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function cased(str) {return caseInsensitive ? str.toLowerCase() : str;}
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if (cased(this.string).indexOf(cased(pattern), this.pos) == this.pos) {
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if (consume !== false) this.pos += str.length;
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return true;
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}
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}
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else {
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var match = this.string.slice(this.pos).match(pattern);
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if (match && consume !== false) this.pos += match[0].length;
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return match;
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}
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}
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};
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JavaScript mode supports several configuration options:
json
which will set the mode to expect JSON data rather than a JavaScript program.jsonld
which will set the mode to expect JSON-LD linked data rather than a JavaScript program (demo).typescript
which will activate additional syntax highlighting and some other things for TypeScript code (demo).statementIndent
which (given a number) will determine the amount of indentation to use for statements continued on a new line.wordCharacters
, a regexp that indicates which characters should be considered part of an identifier. Defaults to/[\w$]/
, which does not handle non-ASCII identifiers. Can be set to something more elaborate to improve Unicode support.
MIME types defined: text/javascript
, application/json
, application/ld+json
, text/typescript
, application/typescript
.