Mercurial > repos > tabletprog
comparison parser.js @ 5:ed5b563147ec
Wrote constructors for AST objects
author | Mike Pavone <pavone@retrodev.com> |
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date | Mon, 19 Mar 2012 23:06:07 -0700 |
parents | a2c3ac7fafa2 |
children | 554602d4cbc6 |
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4:a2c3ac7fafa2 | 5:ed5b563147ec |
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1 | |
2 function op(left, op, right) | |
3 { | |
4 this.left = left; | |
5 this.op = op; | |
6 this.right = right; | |
7 } | |
8 | |
9 function symbol(name) | |
10 { | |
11 this.name = name; | |
12 } | |
13 | |
14 function intlit(val) | |
15 { | |
16 this.val = val; | |
17 } | |
18 | |
19 function floatlit(val) | |
20 { | |
21 this.val = val; | |
22 } | |
23 | |
24 function strlit(val) | |
25 { | |
26 this.val = val; | |
27 } | |
28 | |
29 function funcall(name, args) | |
30 { | |
31 this.name = name; | |
32 this.args = args; | |
33 this.receiver = null; | |
34 } | |
35 | |
36 function object(messages) | |
37 { | |
38 this.messages = messages; | |
39 } | |
40 | |
41 function lambda(args, expressions) | |
42 { | |
43 this.args = args; | |
44 this.expressions = expressions; | |
45 } | |
46 | |
47 function assignment(sym, expr) | |
48 { | |
49 this.symbol = sym; | |
50 this.expression = expr; | |
51 } | |
1 | 52 |
2 var grammar = | 53 var grammar = |
3 'start = ws module:(object / lambda) ws { return module; };' + | 54 'start = ws module:(object / lambda) ws { return module; };' + |
4 'ws = ([ \\t\\n\\r] / "//" [^\\n]* "\\n")*;' + | 55 'ws = ([ \\t\\n\\r] / "//" [^\\n]* "\\n")*;' + |
5 'hws = ([ \\t] / "/*" ([^*] / "*" ! "/")* "*/" )*;' + | 56 'hws = ([ \\t] / "/*" ([^*] / "*" ! "/")* "*/" )*;' + |
6 'expr = e:(funcall / methcall / opexpr) ws { return e; };' + | 57 'expr = e:(funcall / methcall / opexpr) ws { return e; };' + |
7 'opexpr = left:addsub hws op:("<=" / ">=" / "<" / ">" / "=") hws right:opexpr { return {type: "op", left: left, op: op, right: right }; } / addsub;' + | 58 'opexpr = left:addsub hws opn:("<=" / ">=" / "<" / ">" / "=") hws right:opexpr { return new op(left, opn, right); } / addsub;' + |
8 'addsub = left:muldiv hws op:("+"/"-") hws right:addsub { return {type: "op", left: left, op: op, right: right }; } / muldiv;'+ | 59 'addsub = left:muldiv hws opn:("+"/"-") hws right:addsub { return new op(left, opn, right); } / muldiv;'+ |
9 'muldiv = left:primlitsym hws op:("*"/"/") hws right:muldiv { return {type: "op", left: left, op: op, right: right }; } / primlitsym;'+ | 60 'muldiv = left:primlitsym hws opn:("*"/"/") hws right:muldiv { return new op(left, opn, right); } / primlitsym;'+ |
10 'primlitsym = hws val:(float / int / string / symbol / object / lambda / "(" expr:expr hws ")" { return expr; }) { return val; };' + | 61 'primlitsym = hws val:(float / int / string / symbol / object / lambda / "(" expr:expr hws ")" { return expr; }) { return val; };' + |
11 'symbol = chars:[a-zA-Z_!?@]+ trailing:(":"? [a-zA-Z_!?@0-9])* ! ":" { return {type: "symbol", name: chars.join("") + trailing.join("")}; };' + | 62 'symbol = chars:[a-zA-Z_!?@]+ trailing:(":"? [a-zA-Z_!?@0-9])* ! ":" { return new symbol(chars.join("") + trailing.join("")); };' + |
12 'float = digits:[0-9]+ "." decimals:[0-9]+ { return {type: "floatlit", value: parseFloat(digits.join("") + "." + decimals.join("")) }; };' + | 63 'float = digits:[0-9]+ "." decimals:[0-9]+ { return new floatlit(parseFloat(digits.join("") + "." + decimals.join(""))); };' + |
13 'int = digits:[0-9]+ { return {type: "intlit", value: parseInt(digits.join(""), 10)}; };' + | 64 'int = digits:[0-9]+ { return new intlit(parseInt(digits.join(""), 10)); };' + |
14 'string = "\\"" text:[^\\"]* "\\"" { return {type: "strlit", value: text.join("")}; };' + | 65 'string = "\\"" text:[^\\"]* "\\"" { return new strlit(text.join("")); };' + |
15 'object = "#{" ws messages:assignment* "}" { return {type: "object", messages: messages}; };' + | 66 'object = "#{" ws messages:assignment* "}" { return new object(messages); };' + |
16 'assignment = hws sym:symbol hws "<-" expr:expr ws { return {type: "assignment", symbol: sym, expression: expr}; }' + | 67 'assignment = hws sym:symbol hws "<-" expr:expr ws { return new assignment(sym, expr); }' + |
17 'lambda = args:((& ":") argname+ )? "{" ws exprs:(assignment / expr)* "}" { return {type: "lambda", args: args[1], expressions: exprs}; };' + | 68 'lambda = args:((& ":") argname+ )? "{" ws exprs:(assignment / expr)* "}" { return new lambda(args[1], exprs); };' + |
18 'argname = init:":"? chars:[a-zA-Z_!?@]+ trailing:[a-zA-Z_!?@0-9]* hws { return {type: "symbol", name: init + chars.join("") + trailing.join("")}; };' + | 69 'argname = init:":"? chars:[a-zA-Z_!?@]+ trailing:[a-zA-Z_!?@0-9]* hws { return new symbol(init + chars.join("") + trailing.join("")); };' + |
19 '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}; };' + | 70 'funcall = hws parts: funcallpart+ { var fun = ""; var args = []; for (var i in parts) { fun += parts[i].name; args = args.concat(parts[i].args); } return new funcall(fun, args); };' + |
20 'funcallpart = fun:funpart args:opexpr* hws { return { name: fun, args: args}; };' + | 71 'funcallpart = fun:funpart args:opexpr* hws { return { name: fun, args: args}; };' + |
21 'funpart = chars:[a-zA-Z_!?@]+ middle:[a-zA-Z_!?@0-9]* ":" & [ \\t\\n\\r] { return chars.join("") + middle.join("") + ":"; };' + | 72 'funpart = chars:[a-zA-Z_!?@]+ middle:[a-zA-Z_!?@0-9]* ":" & [ \\t\\n\\r] { return chars.join("") + middle.join("") + ":"; };' + |
22 'methcall = receiver:opexpr hws info:methcallrest { info.receiver = receiver; return info; };' + | 73 'methcall = receiver:opexpr hws info:methcallrest { info.receiver = receiver; return info; };' + |
23 'methcallrest = funcall / unarymeth;' + | 74 'methcallrest = funcall / unarymeth;' + |
24 'unarymeth = name:symbol { return {type: "funcall", name:name, args: []}; };'; | 75 'unarymeth = name:symbol { return new funcall(name, []); };'; |
25 var parser = PEG.buildParser(grammar); | 76 var parser = PEG.buildParser(grammar); |
26 | 77 |
27 //var parser = PEG.buildParser('start = expr; expr = int; int = digits:[0-9]+ { return parseInt(digits.join(""), 10); }'); | 78 //var parser = PEG.buildParser('start = expr; expr = int; int = digits:[0-9]+ { return parseInt(digits.join(""), 10); }'); |
28 | 79 |
29 onReady(function() { | 80 onReady(function() { |