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1
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1
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0
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2 var grammar =
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1
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3 'start = ws module:(object / lambda) ws { return module; };' +
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4 'ws = [ \\t\\n\\r]*;' +
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5 'hws = [ \\t]*;' +
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6 'expr = funcall / addsub;' +
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7 'addsub = left:muldiv hws op:("+"/"-") hws right:addsub ws { return {type: "op", left: left, op: op, right: right }; } / muldiv;'+
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8 'muldiv = left:primlitsym hws op:("*"/"/") hws right:muldiv { return {type: "op", left: left, op: op, right: right }; } / primlitsym;'+
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9 'primlitsym = ws val:(float / int / string / symbol / object / lambda / "(" expr:expr hws ")" { return expr; }) { return val; };' +
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10 'symbol = chars:[a-zA-Z_!?@]+ trailing:(":"? [a-zA-Z_!?@0-9~])* ! ":" { return {type: "symbol", name: chars.join("") + trailing.join("")}; };' +
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0
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11 'float = digits:[0-9]+ "." decimals:[0-9]+ { return {type: "floatlit", value: parseFloat(digits.join("") + "." + decimals.join("")) }; };' +
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12 'int = digits:[0-9]+ { return {type: "intlit", value: parseInt(digits.join(""), 10)}; };' +
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13 'string = "\\"" text:[^\\"]* "\\"" { return {type: "strlit", value: text.join("")}; };' +
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14 'object = "#{" messages:assignment* "}" { return {type: "object", messages: messages}; };' +
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1
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15 'assignment = ws sym:symbol hws "<-" expr:expr { return {type: "assignment", symbol: sym, expression: expr}; }' +
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16 'lambda = args:((& ":") argname+ )? "{" exprs:(assignment / expr)* ws "}" { return {type: "lambda", args: args[1], expressions: exprs}; };' +
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17 'argname = init:":"? chars:[a-zA-Z_!?@]+ trailing:[a-zA-Z_!?@0-9%]* hws { return {type: "symbol", name: init + chars.join("") + trailing.join("")}; };' +
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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}; };' +
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19 'funcallpart = fun:funpart args:addsub* hws { return { name: fun, args: args}; };' +
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20 'funpart = chars:[a-zA-Z_!?@]+ middle:[a-zA-Z_!?@0-9#]* ":" & [ \\t\\n\\r] { return chars.join("") + middle.join("") + ":"; };';
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0
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21 var parser = PEG.buildParser(grammar);
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22
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23 //var parser = PEG.buildParser('start = expr; expr = int; int = digits:[0-9]+ { return parseInt(digits.join(""), 10); }');
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24
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25 onReady(function() {
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26 q('input[type=button]').onclick = function() {
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27 var text = q('textarea').value;
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28 try {
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29 var parsed = parser.parse(text);
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30 q('div').innerHTML = text + "<br><br>" + JSON.stringify(parsed);
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31 console.log(parsed);
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32 } catch(e) {
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33 q('div').innerHTML = e.message + '<br>Line: ' + e.line + '<br>Col: ' + e.column;
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34 }
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35 }
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36 });
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37
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