(function(sc) {
"use strict";
require("./lexer");
var Token = sc.lang.compiler.Token;
var Keywords = sc.lang.compiler.Keywords;
var Lexer = sc.lang.compiler.Lexer;
Lexer.addLexMethod("Identifier", function(source, index) {
return new IdentifierLexer(source, index).scan();
});
function IdentifierLexer(source, index) {
this.source = source;
this.index = index;
}
var re = /^(_|[a-zA-Z][a-zA-Z0-9_]*)/;
IdentifierLexer.prototype.scan = function() {
var source = this.source;
var index = this.index;
var value = re.exec(source.slice(index))[0];
var length = value.length;
var type;
if (source.charAt(index + length) === ":") {
type = Token.Label;
length += 1;
} else if (isKeyword(value)) {
type = Token.Keyword;
} else if (value === "inf") {
type = Token.FloatLiteral;
value = "Infinity";
} else if (value === "pi") {
type = Token.FloatLiteral;
value = String(Math.PI);
} else if (value === "nil") {
type = Token.NilLiteral;
} else if (value === "true") {
type = Token.TrueLiteral;
} else if (value === "false") {
type = Token.FalseLiteral;
} else {
type = Token.Identifier;
}
return { type: type, value: value, length: length };
};
function isKeyword(value) {
return Keywords.hasOwnProperty(value);
}
})(sc);
|