+ Object,
+ {
+
+ rewind : function() {
+ this.cursor = -1;
+ },
+
+ /**
+ @type JSDOC.Token
+ */
+ look : function(/**Number*/n, /**Boolean*/considerWhitespace) {
+ if (typeof n == "undefined") n = 0;
+
+ if (considerWhitespace == true) {
+ if (this.cursor+n < 0 || this.cursor+n > this.tokens.length) return {};
+ return this.tokens[this.cursor+n];
+ }
+ else {
+ var count = 0;
+ var i = this.cursor;
+
+ while (true) {
+ if (i < 0) return new Token("", "VOID", "START_OF_STREAM");
+ else if (i > this.tokens.length) return new Token("", "VOID", "END_OF_STREAM");
+
+ if (i != this.cursor && (this.tokens[i] === undefined || this.tokens[i].is("WHIT"))) {
+ if (n < 0) i--; else i++;
+ continue;
+ }
+
+ if (count == Math.abs(n)) {
+ return this.tokens[i];
+ }
+ count++;
+ (n < 0)? i-- : i++;
+ }