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annotate parser.js @ 48:18ab96287c3a

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Add builtin module os containing some baisc POSIX file IO
author Mike Pavone <pavone@retrodev.com>
date Fri, 13 Jul 2012 10:46:27 -0700
parents 9dd370530f69
children f2cda2e6f70e
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2 function op(left, op, right)
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3 {
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4 this.left = left;
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5 this.op = op;
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6 this.right = right;
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7 }
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8
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132c7756860e Use populateSymbols to generate symbol tables during compilation rather than populating them as we go. This change allows us to refer to symbols defined later in the input stream and also gives the symbol table logic a single home that can be used both by the compiler and editor.
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9 function symbol(name, symbols)
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10 {
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11 this.name = name;
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12 this.symbols = symbols;
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13 }
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14 symbol.prototype.cleanName = function() {
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15 return this.name[0] == ':' ? this.name.substr(1) : this.name;
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16 }
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18 function intlit(val)
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19 {
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20 this.val = val;
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21 }
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23 function floatlit(val)
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24 {
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25 this.val = val;
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26 }
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28 function strlit(val)
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29 {
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30 this.val = val;
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31 }
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33 function listlit(val)
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34 {
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35 this.val = val;
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36 }
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38 function arraylit(val)
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39 {
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40 this.val = val;
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41 }
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42
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43 function funcall(name, args)
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44 {
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45 this.name = name;
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46 this.args = args;
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47 this.receiver = null;
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48 }
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49
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50 function object(messages)
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51 {
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52 this.messages = messages;
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53 }
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54
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55 function lambda(args, expressions)
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56 {
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57 this.args = args ? args : [];
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58 this.expressions = expressions;
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59 }
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60
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61 function assignment(sym, expr)
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62 {
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63 this.symbol = sym;
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64 this.expression = expr;
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65 }
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66
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67 function isLambda(node)
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68 {
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69 return node instanceof lambda;
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70 }
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71
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72 var grammar =
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73 'start = ws module:(object / lambda) ws { return module; };' +
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74 'ws = ([ \\t\\n\\r] / "//" [^\\n]* "\\n")*;' +
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75 'hws = ([ \\t] / "/*" ([^*] / "*" ! "/")* "*/" )*;' +
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76 'expr = e:(funcall / methcall / opexpr) ws { return e; };' +
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77 'opexpr = left:addsub pieces:(hws ("<=" / ">=" / "<" / ">" / "=") hws addsub)* { if (pieces.length) { var cur = new op(left, pieces[0][1], pieces[0][3]); for (var i = 1; i < pieces.length; i++) { cur = new op(cur, pieces[i][1], pieces[i][3]); } return cur; } else { return left; } };'+
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78 'addsub = left:muldiv pieces:(hws ("+"/"-"/".") hws muldiv)* { if (pieces.length) { var cur = new op(left, pieces[0][1], pieces[0][3]); for (var i = 1; i < pieces.length; i++) { cur = new op(cur, pieces[i][1], pieces[i][3]); } return cur; } else { return left; } };'+
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79 'muldiv = left:primlitsym pieces:(hws ("*"/"/") hws primlitsym)* { if (pieces.length) { var cur = new op(left, pieces[0][1], pieces[0][3]); for (var i = 1; i < pieces.length; i++) { cur = new op(cur, pieces[i][1], pieces[i][3]); } return cur; } else { return left; } };'+
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80 'primlitsym = hws val:(float / int / string / symbol / object / array / list / lambda / "(" expr:expr hws ")" { return expr; }) { return val; };' +
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81 '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("")); };' +
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82 'float = digits:[0-9]+ "." decimals:[0-9]+ { return new floatlit(parseFloat(digits.join("") + "." + decimals.join(""))); };' +
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83 'int = digits:[0-9]+ { return new intlit(parseInt(digits.join(""), 10)); };' +
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84 'string = "\\"" text:(strpart/escape)* "\\"" { return new strlit(text.join("")); };' +
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85 'strpart = text:[^\\"\\\\]+ { return text.join(""); };' +
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86 'escape = "\\\\" char:[nt\\"r] { if (char == "n") { return "\\n"; } if (char == "r") { return "\\r"; } return char; };' +
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87 'object = "#{" ws messages:(assignment / funcall)* "}" { return new object(messages); };' +
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88 'array = "#[" ws els:opexpr* "]" { return new arraylit(els); };' +
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89 'list = "[" ws els:opexpr* "]" { return new listlit(els); };' +
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90 'assignment = ws sym:symbol hws "<-" expr:expr ws { return new assignment(sym, expr); }' +
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91 'lambda = args:((& ":") argname+ )? "{" ws exprs:(assignment / expr)* "}" { return new lambda(args[1], exprs); };' +
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92 'argname = init:":"? chars:[a-zA-Z_!?@]+ trailing:[a-zA-Z_!?@0-9]* hws { return new symbol(init + chars.join("") + trailing.join("")); };' +
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93 '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); };' +
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94 'funcallpart = fun:funpart args:opexpr* hws { return { name: fun, args: args}; };' +
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95 'funpart = chars:[a-zA-Z_!?@]+ middle:[a-zA-Z_!?@0-9]* ":" & [ \\t\\n\\r] { return chars.join("") + middle.join("") + ":"; };' +
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96 'methcall = receiver:opexpr hws info:methcallrest { info.receiver = receiver; return info; };' +
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97 'methcallrest = funcall / unarymeth;' +
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98 'unarymeth = name:symbol { return new funcall(name.name, []); };';
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99 var parser = PEG.buildParser(grammar);
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