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1 var grammar =
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2 'start = addsub;' +
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3 'addsub = left:muldiv " "* op:("+"/"-") " "* right:addsub [ \\n\\r]* { return {type: "op", left: left, op: op, right: right }; } / muldiv;'+
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4 'muldiv = left:primlitsym " "* op:("*"/"/") " "* right:muldiv { return {type: "op", left: left, op: op, right: right }; } / primlitsym;'+
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5 'primlitsym = [ \\n\\r]* val:(float / int / string / symbol / object / lambda / "(" expr:addsub " "* ")" { return expr; }) { return val; };' +
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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("")}; };' +
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7 'float = digits:[0-9]+ "." decimals:[0-9]+ { return {type: "floatlit", value: parseFloat(digits.join("") + "." + decimals.join("")) }; };' +
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8 'int = digits:[0-9]+ { return {type: "intlit", value: parseInt(digits.join(""), 10)}; };' +
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9 'string = "\\"" text:[^\\"]* "\\"" { return {type: "strlit", value: text.join("")}; };' +
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10 'object = "#{" messages:assignment* "}" { return {type: "object", messages: messages}; };' +
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11 'assignment = [ \\n\\r]* sym:symbol " "* "<-" expr:addsub { return {type: "assignment", symbol: sym, expression: expr}; }' +
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12 'lambda = args:((& ":") argname+ )? "{" exprs:(assignment / addsub)* [ \\n\\r]* "}" { return {type: "lambda", args: args[1], expressions: exprs}; };' +
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13 'argname = chars:[a-zA-Z_!?@:]+ trailing:[a-zA-Z_!?@0-9]* " "* { return {type: "symbol", name: chars.join("") + trailing.join("")}; };';
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14 var parser = PEG.buildParser(grammar);
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15
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16 //var parser = PEG.buildParser('start = expr; expr = int; int = digits:[0-9]+ { return parseInt(digits.join(""), 10); }');
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17
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18 onReady(function() {
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19 q('input[type=button]').onclick = function() {
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20 var text = q('textarea').value;
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21 try {
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22 var parsed = parser.parse(text);
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23 q('div').innerHTML = text + "<br><br>" + JSON.stringify(parsed);
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24 console.log(parsed);
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25 } catch(e) {
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26 q('div').innerHTML = e.message + '<br>Line: ' + e.line + '<br>Col: ' + e.column;
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27 }
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28 }
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29 });
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30
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