Mercurial > repos > tabletprog
view parser.js @ 41:0558dad9d061
Add basic string support
author | Mike Pavone <pavone@retrodev.com> |
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date | Wed, 11 Jul 2012 21:57:38 -0700 |
parents | e7be612fd3ae |
children | 4e983fe32047 |
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function op(left, op, right) { this.left = left; this.op = op; this.right = right; } function symbol(name, symbols) { this.name = name; this.symbols = symbols; } symbol.prototype.cleanName = function() { return this.name[0] == ':' ? this.name.substr(1) : this.name; } function intlit(val) { this.val = val; } function floatlit(val) { this.val = val; } function strlit(val) { this.val = val; } function listlit(val) { this.val = val; } function arraylit(val) { this.val = val; } function funcall(name, args) { this.name = name; this.args = args; this.receiver = null; } function object(messages) { this.messages = messages; } function lambda(args, expressions) { this.args = args; this.expressions = expressions; } function assignment(sym, expr) { this.symbol = sym; this.expression = expr; } function isLambda(node) { return node instanceof lambda; } 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 opn:("<=" / ">=" / "<" / ">" / "=") hws right:opexpr { return new op(left, opn, right); } / addsub;' + 'addsub = left:muldiv hws opn:("+"/"-") hws right:addsub { return new op(left, opn, right); } / muldiv;'+ 'muldiv = left:primlitsym hws opn:("*"/"/") hws right:muldiv { return new op(left, opn, right); } / primlitsym;'+ 'primlitsym = hws val:(float / int / string / symbol / object / array / list / lambda / "(" expr:expr hws ")" { return expr; }) { return val; };' + 'symbol = chars:[a-zA-Z_!?@]+ trailing:(":"? [a-zA-Z_!?@0-9])* ! ":" { for (var i in trailing) { trailing[i] = trailing[i].join(""); } return new symbol(chars.join("") + trailing.join("")); };' + 'float = digits:[0-9]+ "." decimals:[0-9]+ { return new floatlit(parseFloat(digits.join("") + "." + decimals.join(""))); };' + 'int = digits:[0-9]+ { return new intlit(parseInt(digits.join(""), 10)); };' + 'string = "\\"" text:[^\\"]* "\\"" { return new strlit(text.join("")); };' + 'object = "#{" ws messages:(assignment / funcall)* "}" { return new object(messages); };' + 'array = "#[" ws els:opexpr* "]" { return new arraylit(els); };' + 'list = "[" ws els:opexpr* "]" { return new listlit(els); };' + 'assignment = ws sym:symbol hws "<-" expr:expr ws { return new assignment(sym, expr); }' + 'lambda = args:((& ":") argname+ )? "{" ws exprs:(assignment / expr)* "}" { return new lambda(args[1], exprs); };' + 'argname = init:":"? chars:[a-zA-Z_!?@]+ trailing:[a-zA-Z_!?@0-9]* hws { return new symbol(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 new funcall(fun, 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 new funcall(name.name, []); };'; var parser = PEG.buildParser(grammar);