wycats
59 lines
965 B
JavaScript
59 lines
965 B
JavaScript
var Lexer = function() {};
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Lexer.prototype = {
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setInput: function(input) {
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this.input = input;
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this.yylineno = 0;
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},
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setupLex: function() {
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this.yyleng = 0;
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this.yytext = '';
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},
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getchar: function(n) {
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n = n || 1;
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var char = "";
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for(var i=0; i<n; i++) {
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char += this.input[0];
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this.yytext += this.input[0];
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this.yyleng++;
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if(char === "\n") this.yylineno++;
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this.input = this.input.slice(1);
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}
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return char;
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},
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readchar: function(n) {
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n = n || 1;
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var char;
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for(var i=0; i<n; i++) {
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char = this.input[i];
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if(char === "\n") this.yylineno++;
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}
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this.input = this.input.slice(n);
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},
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peek: function(n) {
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return this.input.slice(0, n || 1);
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}
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};
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var Visitor = function() {};
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Visitor.prototype = {
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accept: function(object) {
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return this[object.type](object);
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}
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}
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if(exports) {
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exports.Lexer = Lexer;
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exports.Visitor = Visitor;
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}
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