41 { 41 { 42 Value delegate(immutable LexPosition pos, string lay, Value[]) data; 42 Value delegate(immutable LexPosition pos, string lay, Value[]) data; 43 43 44 mixin SimpleConstructor; 44 mixin SimpleConstructor; 45 alias data call; 45 alias data call; 46 override string toString() const { return sprintf!"(function:%s:%s)"(dat 46 override string toString() const { return sprintf!"(function:%s:%s)"(dat 47 } 47 } > 48 > 49 class UndValue : Value > 50 { > 51 mixin SimpleClass; > 52 override string toString() const { return "<undefined>"; } > 53 } 48 54 49 /// Layer ID 55 /// Layer ID 50 56 51 alias string Layer; 57 alias string Layer; 52 58 53 /// Context (variable environment) 59 /// Context (variable environment) 54 /// Simlar to prototype chain of ECMAScript etc. 60 /// Simlar to prototype chain of ECMAScript etc. ................................................................................................................................................................................ 66 if( setIfExist(i, lay, v) ) 72 if( setIfExist(i, lay, v) ) 67 return; 73 return; 68 data[i][lay] = v; 74 data[i][lay] = v; 69 } 75 } 70 76 71 Value get(string i, Layer lay, in LexPosition pos=null) 77 Value get(string i, Layer lay, in LexPosition pos=null) 72 { 78 { 73 if( i in data ) | 79 if( i in data ) { > 80 if( lay !in data[i] ) > 81 throw genex!RuntimeException(pos, sprintf!"varia 74 return data[i][lay]; 82 return data[i][lay]; > 83 } 75 if( prototype is null ) 84 if( prototype is null ) 76 throw new RuntimeException(pos, sprintf!"variable %s not 85 throw new RuntimeException(pos, sprintf!"variable %s not 77 return prototype.get(i, lay); | 86 return prototype.get(i, lay, pos); 78 } 87 } 79 88 80 private: 89 private: 81 Table prototype; 90 Table prototype; 82 Kind kind; 91 Kind kind; 83 Value[Layer][string] data; 92 Value[Layer][string] data; 84 93