Annotation of parser3/src/types/pa_vmethod_frame.h, revision 1.19
1.3 paf 1: /** @file
1.5 paf 2: Parser: @b method_frame write context
1.3 paf 3:
1.1 paf 4: Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com)
1.19 ! paf 5: Author: Alexander Petrosyan <paf@design.ru> (http://paf.design.ru)
1.1 paf 6:
1.19 ! paf 7: $Id: pa_vmethod_frame.h,v 1.18 2001/11/01 14:59:57 paf Exp $
1.1 paf 8: */
9:
10: #ifndef PA_VMETHOD_FRAME_H
11: #define PA_VMETHOD_FRAME_H
12:
13: #include "pa_wcontext.h"
1.12 parser 14: #include "pa_vvoid.h"
1.1 paf 15: #include "pa_vjunction.h"
16:
1.4 paf 17: /** Method frame write context
18: accepts values written by method code
19: also handles method parameters and local variables
1.3 paf 20: */
1.1 paf 21: class VMethodFrame : public WContext {
22: public: // Value
23:
24: const char *type() const { return "method_frame"; }
1.4 paf 25: /// VMethodFrame: my or self_transparent
1.1 paf 26: Value *get_element(const String& name) {
27: if(my) {
28: Value *result=static_cast<Value *>(my->get(name));
29: if(result)
30: return result;
31: }
32: return fself->get_element(name);
33: }
1.4 paf 34: /// VMethodFrame: my or self_transparent
1.1 paf 35: void put_element(const String& name, Value *value){
36: if(!(my && my->put_replace(name, value)))
37: fself->put_element(name, value);
38: }
39:
1.4 paf 40: /// VMethodFrame: self_transparent
1.1 paf 41: VStateless_class* get_class() { return fself->get_class(); }
42:
1.4 paf 43: /// VMethodFrame: self_transparent
1.1 paf 44: VAliased *get_aliased() { return fself->get_aliased(); }
45:
46: public: // wcontext
47:
48: Value *result() {
49: // check the $result value
50: Value *result=my?static_cast<Value*>(my->get(*result_var_name)):0;
51: // if we have one, return it, else return as usual: accumulated fstring or fvalue
1.15 parser 52: return result && (result!=fresult_initial_void) ?result:WContext::result();
1.1 paf 53: }
54:
55: public: // usage
56:
57: VMethodFrame(Pool& apool,
1.8 parser 58: const String& name,
1.13 parser 59: const Junction& ajunction/*info: always method-junction*/) :
1.14 parser 60: WContext(apool, 0 /* empty */),
1.1 paf 61:
62: junction(ajunction),
63: store_param_index(0),
1.15 parser 64: fself(0),
65: fresult_initial_void(0) {
1.9 parser 66: set_name(name);
1.1 paf 67:
68: const Method &method=*junction.method;
69:
1.3 paf 70: if(method.max_numbered_params_count) { // are this method params numbered?
71: my=0; // no named parameters
1.8 parser 72: fnumbered_params=NEW MethodParams(pool(), name); // create storage
1.3 paf 73: } else { // named params
1.1 paf 74: my=NEW Hash(pool()); // create storage
1.3 paf 75: fnumbered_params=0; // no numbered parameters
1.1 paf 76:
77: if(method.locals_names) { // are there any local var names?
78: // remember them
79: // those are flags that name is local == to be looked up in 'my'
80: for(int i=0; i<method.locals_names->size(); i++) {
81: // speedup: not checking for clash with "result" name
1.12 parser 82: Value *value=NEW VVoid(pool());
1.1 paf 83: const String& name=*method.locals_names->get_string(i);
1.18 paf 84: set_my_variable(name, value);
1.1 paf 85: }
86: }
87: { // always there is one local: $result
1.15 parser 88: fresult_initial_void=NEW VVoid(pool());
1.18 paf 89: set_my_variable(*result_var_name, fresult_initial_void);
1.1 paf 90: }
91: }
92: }
93:
94: void set_self(Value& aself) { fself=&aself; }
95: Value *self() { return fself; }
96:
97: void store_param(const String& actual_method_name, Value *value) {
98: const Method& method=*junction.method;
99: int max_params=
100: method.max_numbered_params_count?method.max_numbered_params_count:
101: method.params_names?method.params_names->size():
102: 0;
103: if(store_param_index==max_params)
1.17 parser 104: throw Exception(0,0,
1.1 paf 105: &actual_method_name,
1.7 paf 106: "method of %s (%s) accepts maximum %d parameter(s)",
1.1 paf 107: junction.self.name().cstr(),
108: junction.self.type(),
109: max_params);
110:
111: if(method.max_numbered_params_count) { // are this method params numbered?
112: *fnumbered_params+=value;
113: } else { // named param
114: // speedup: not checking for clash with "result" name
115: const String& name=*method.params_names->get_string(store_param_index);
1.18 paf 116: set_my_variable(name, value);
1.1 paf 117: }
118: store_param_index++;
119: }
120: void fill_unspecified_params() {
121: const Method &method=*junction.method;
122: if(method.params_names) // there are any named parameters might need filling?
123: for(; store_param_index<method.params_names->size(); store_param_index++) {
1.12 parser 124: Value *value=NEW VVoid(pool());
1.1 paf 125: const String& name=*method.params_names->get_string(store_param_index);
126: my->put(name, value);
127: value->set_name(name);
128: }
129: }
130:
1.3 paf 131: MethodParams *numbered_params() { return fnumbered_params; }
1.18 paf 132:
133: private:
134:
135: void set_my_variable(const String& name, Value *value) {
136: my->put(name, value); // remember param
137: value->set_name(name); // set param's 'name'
138: }
1.1 paf 139:
140: public:
141:
142: const Junction& junction;
143:
144: private:
145: int store_param_index;
1.3 paf 146: Hash *my;/*OR*/MethodParams *fnumbered_params;
1.1 paf 147: Value *fself;
1.15 parser 148:
149: private:
150: Value *fresult_initial_void;
1.1 paf 151:
152: };
153:
154: #endif
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