Mercurial > repos > tabletprog
view parser.js @ 4:a2c3ac7fafa2
Added support for comments
author | Mike Pavone <pavone@retrodev.com> |
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date | Mon, 19 Mar 2012 22:45:03 -0700 |
parents | 454c0346f357 |
children | ed5b563147ec |
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var grammar = 'start = ws module:(object / lambda) ws { return module; };' + 'ws = ([ \\t\\n\\r] / "//" [^\\n]* "\\n")*;' + 'hws = ([ \\t] / "/*" ([^*] / "*" ! "/")* "*/" )*;' + 'expr = e:(funcall / methcall / opexpr) ws { return e; };' + 'opexpr = left:addsub hws op:("<=" / ">=" / "<" / ">" / "=") hws right:opexpr { return {type: "op", left: left, op: op, right: right }; } / addsub;' + 'addsub = left:muldiv hws op:("+"/"-") hws right:addsub { return {type: "op", left: left, op: op, right: right }; } / muldiv;'+ 'muldiv = left:primlitsym hws op:("*"/"/") hws right:muldiv { return {type: "op", left: left, op: op, right: right }; } / primlitsym;'+ 'primlitsym = hws val:(float / int / string / symbol / object / lambda / "(" expr:expr hws ")" { return expr; }) { return val; };' + 'symbol = chars:[a-zA-Z_!?@]+ trailing:(":"? [a-zA-Z_!?@0-9])* ! ":" { return {type: "symbol", name: chars.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 = "#{" ws messages:assignment* "}" { return {type: "object", messages: messages}; };' + 'assignment = hws sym:symbol hws "<-" expr:expr ws { return {type: "assignment", symbol: sym, expression: expr}; }' + 'lambda = args:((& ":") argname+ )? "{" ws exprs:(assignment / expr)* "}" { return {type: "lambda", args: args[1], expressions: exprs}; };' + 'argname = init:":"? chars:[a-zA-Z_!?@]+ trailing:[a-zA-Z_!?@0-9]* hws { return {type: "symbol", name: init + chars.join("") + trailing.join("")}; };' + 'funcall = hws parts: funcallpart+ { var fun = ""; var args = []; for (var i in parts) { fun += parts[i].name; args = args.concat(parts[i].args); } return {type: "funcall", name: fun, args: args}; };' + 'funcallpart = fun:funpart args:opexpr* hws { return { name: fun, args: args}; };' + 'funpart = chars:[a-zA-Z_!?@]+ middle:[a-zA-Z_!?@0-9]* ":" & [ \\t\\n\\r] { return chars.join("") + middle.join("") + ":"; };' + 'methcall = receiver:opexpr hws info:methcallrest { info.receiver = receiver; return info; };' + 'methcallrest = funcall / unarymeth;' + 'unarymeth = name:symbol { return {type: "funcall", name:name, args: []}; };'; 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; } } });