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comparison parser.js @ 1:a57a12bdae96

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Added funcall syntax
author Mike Pavone <pavone@retrodev.com>
date Mon, 19 Mar 2012 21:29:33 -0700
parents 3d1b8e96f5dc
children 454c0346f357
comparison
equal deleted inserted replaced
0:3d1b8e96f5dc 1:a57a12bdae96
1
1 var grammar = 2 var grammar =
2 'start = addsub;' + 3 'start = ws module:(object / lambda) ws { return module; };' +
3 'addsub = left:muldiv " "* op:("+"/"-") " "* right:addsub [ \\n\\r]* { return {type: "op", left: left, op: op, right: right }; } / muldiv;'+ 4 'ws = [ \\t\\n\\r]*;' +
4 'muldiv = left:primlitsym " "* op:("*"/"/") " "* right:muldiv { return {type: "op", left: left, op: op, right: right }; } / primlitsym;'+ 5 'hws = [ \\t]*;' +
5 'primlitsym = [ \\n\\r]* val:(float / int / string / symbol / object / lambda / "(" expr:addsub " "* ")" { return expr; }) { return val; };' + 6 'expr = funcall / addsub;' +
6 '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("")}; };' + 7 'addsub = left:muldiv hws op:("+"/"-") hws right:addsub ws { return {type: "op", left: left, op: op, right: right }; } / muldiv;'+
8 'muldiv = left:primlitsym hws op:("*"/"/") hws right:muldiv { return {type: "op", left: left, op: op, right: right }; } / primlitsym;'+
9 'primlitsym = ws val:(float / int / string / symbol / object / lambda / "(" expr:expr hws ")" { return expr; }) { return val; };' +
10 'symbol = chars:[a-zA-Z_!?@]+ trailing:(":"? [a-zA-Z_!?@0-9~])* ! ":" { return {type: "symbol", name: chars.join("") + trailing.join("")}; };' +
7 'float = digits:[0-9]+ "." decimals:[0-9]+ { return {type: "floatlit", value: parseFloat(digits.join("") + "." + decimals.join("")) }; };' + 11 'float = digits:[0-9]+ "." decimals:[0-9]+ { return {type: "floatlit", value: parseFloat(digits.join("") + "." + decimals.join("")) }; };' +
8 'int = digits:[0-9]+ { return {type: "intlit", value: parseInt(digits.join(""), 10)}; };' + 12 'int = digits:[0-9]+ { return {type: "intlit", value: parseInt(digits.join(""), 10)}; };' +
9 'string = "\\"" text:[^\\"]* "\\"" { return {type: "strlit", value: text.join("")}; };' + 13 'string = "\\"" text:[^\\"]* "\\"" { return {type: "strlit", value: text.join("")}; };' +
10 'object = "#{" messages:assignment* "}" { return {type: "object", messages: messages}; };' + 14 'object = "#{" messages:assignment* "}" { return {type: "object", messages: messages}; };' +
11 'assignment = [ \\n\\r]* sym:symbol " "* "<-" expr:addsub { return {type: "assignment", symbol: sym, expression: expr}; }' + 15 'assignment = ws sym:symbol hws "<-" expr:expr { return {type: "assignment", symbol: sym, expression: expr}; }' +
12 'lambda = args:((& ":") argname+ )? "{" exprs:(assignment / addsub)* [ \\n\\r]* "}" { return {type: "lambda", args: args[1], expressions: exprs}; };' + 16 'lambda = args:((& ":") argname+ )? "{" exprs:(assignment / expr)* ws "}" { return {type: "lambda", args: args[1], expressions: exprs}; };' +
13 'argname = chars:[a-zA-Z_!?@:]+ trailing:[a-zA-Z_!?@0-9]* " "* { return {type: "symbol", name: chars.join("") + trailing.join("")}; };'; 17 'argname = init:":"? chars:[a-zA-Z_!?@]+ trailing:[a-zA-Z_!?@0-9%]* hws { return {type: "symbol", name: init + chars.join("") + trailing.join("")}; };' +
18 'funcall = ws 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}; };' +
19 'funcallpart = fun:funpart args:addsub* hws { return { name: fun, args: args}; };' +
20 'funpart = chars:[a-zA-Z_!?@]+ middle:[a-zA-Z_!?@0-9#]* ":" & [ \\t\\n\\r] { return chars.join("") + middle.join("") + ":"; };';
14 var parser = PEG.buildParser(grammar); 21 var parser = PEG.buildParser(grammar);
15 22
16 //var parser = PEG.buildParser('start = expr; expr = int; int = digits:[0-9]+ { return parseInt(digits.join(""), 10); }'); 23 //var parser = PEG.buildParser('start = expr; expr = int; int = digits:[0-9]+ { return parseInt(digits.join(""), 10); }');
17 24
18 onReady(function() { 25 onReady(function() {