Mercurial > repos > tabletprog
view parser.js @ 0:3d1b8e96f5dc
Initial commit
author | Mike Pavone <pavone@retrodev.com> |
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date | Sun, 18 Mar 2012 12:03:04 -0700 |
parents | |
children | a57a12bdae96 |
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var grammar = 'start = addsub;' + 'addsub = left:muldiv " "* op:("+"/"-") " "* right:addsub [ \\n\\r]* { return {type: "op", left: left, op: op, right: right }; } / muldiv;'+ 'muldiv = left:primlitsym " "* op:("*"/"/") " "* right:muldiv { return {type: "op", left: left, op: op, right: right }; } / primlitsym;'+ 'primlitsym = [ \\n\\r]* val:(float / int / string / symbol / object / lambda / "(" expr:addsub " "* ")" { return expr; }) { return val; };' + 'symbol = chars:[a-zA-Z_!?@]+ middle:[a-zA-Z_!?@0-9:]* trailing:[a-zA-Z_!?@0-9]* { return {type: "symbol", name: chars.join("") + middle.join("") + trailing.join("")}; };' + 'float = digits:[0-9]+ "." decimals:[0-9]+ { return {type: "floatlit", value: parseFloat(digits.join("") + "." + decimals.join("")) }; };' + 'int = digits:[0-9]+ { return {type: "intlit", value: parseInt(digits.join(""), 10)}; };' + 'string = "\\"" text:[^\\"]* "\\"" { return {type: "strlit", value: text.join("")}; };' + 'object = "#{" messages:assignment* "}" { return {type: "object", messages: messages}; };' + 'assignment = [ \\n\\r]* sym:symbol " "* "<-" expr:addsub { return {type: "assignment", symbol: sym, expression: expr}; }' + 'lambda = args:((& ":") argname+ )? "{" exprs:(assignment / addsub)* [ \\n\\r]* "}" { return {type: "lambda", args: args[1], expressions: exprs}; };' + 'argname = chars:[a-zA-Z_!?@:]+ trailing:[a-zA-Z_!?@0-9]* " "* { return {type: "symbol", name: chars.join("") + trailing.join("")}; };'; var parser = PEG.buildParser(grammar); //var parser = PEG.buildParser('start = expr; expr = int; int = digits:[0-9]+ { return parseInt(digits.join(""), 10); }'); onReady(function() { q('input[type=button]').onclick = function() { var text = q('textarea').value; try { var parsed = parser.parse(text); q('div').innerHTML = text + "<br><br>" + JSON.stringify(parsed); console.log(parsed); } catch(e) { q('div').innerHTML = e.message + '<br>Line: ' + e.line + '<br>Col: ' + e.column; } } });