Annotation of parser3/src/types/pa_vmethod_frame.h, revision 1.41
1.3 paf 1: /** @file
1.5 paf 2: Parser: @b method_frame write context
1.3 paf 3:
1.21 paf 4: Copyright (c) 2001, 2002 ArtLebedev Group (http://www.artlebedev.com)
1.22 paf 5: Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
1.1 paf 6: */
7:
8: #ifndef PA_VMETHOD_FRAME_H
9: #define PA_VMETHOD_FRAME_H
1.28 paf 10:
1.41 ! paf 11: static const char* IDENT_VMETHOD_FRAME_H="$Date: 2002/10/15 08:31:57 $";
1.1 paf 12:
13: #include "pa_wcontext.h"
1.12 parser 14: #include "pa_vvoid.h"
1.1 paf 15: #include "pa_vjunction.h"
1.35 paf 16: #include "pa_request.h"
1.1 paf 17:
1.40 paf 18: // defines
19:
20: #define CALLER_NAME "caller"
21:
22:
1.4 paf 23: /** Method frame write context
24: accepts values written by method code
25: also handles method parameters and local variables
1.3 paf 26: */
1.1 paf 27: class VMethodFrame : public WContext {
28: public: // Value
29:
30: const char *type() const { return "method_frame"; }
1.20 paf 31:
32: /// VMethodFrame: $result | parent get_string(=accumulated fstring)
33: const String *get_string() {
34: // check the $result value
35: Value *result=get_result_variable();
36: // if we have one, return it's string value, else return as usual: accumulated fstring or fvalue
37: return result ? result->get_string() : WContext::get_string();
38: }
39:
1.40 paf 40: /// VMethodFrame: my or self_transparent or $caller
1.34 paf 41: Value *get_element(const String& aname, Value *aself, bool looking_up) {
1.25 paf 42: if(junction.method->max_numbered_params_count==0) {
1.32 paf 43: if(Value *result=static_cast<Value *>(my.get(aname)))
1.1 paf 44: return result;
45: }
1.41 ! paf 46: if(Value *result=self().get_element(aname, aself, looking_up))
1.40 paf 47: return result;
48:
49: if(aname==CALLER_NAME)
50: return caller();
51:
52: return 0;
1.1 paf 53: }
1.4 paf 54: /// VMethodFrame: my or self_transparent
1.32 paf 55: /*override*/ bool put_element(const String& aname, Value *avalue, bool replace) {
56: if(junction.method->max_numbered_params_count==0 && my.put_replace(aname, avalue))
57: return true;
58:
1.41 ! paf 59: return self().put_element(aname, avalue, replace);
1.1 paf 60: }
61:
1.4 paf 62: /// VMethodFrame: self_transparent
1.41 ! paf 63: VStateless_class* get_class() { return self().get_class(); }
1.1 paf 64:
1.30 paf 65: public: // WContext
1.1 paf 66:
1.35 paf 67: /* override */ StringOrValue result() {
1.1 paf 68: // check the $result value
1.24 paf 69: Value *result_value=get_result_variable();
1.1 paf 70: // if we have one, return it, else return as usual: accumulated fstring or fvalue
1.24 paf 71: return result_value ? StringOrValue(0, result_value) : WContext::result();
1.1 paf 72: }
73:
74: public: // usage
75:
76: VMethodFrame(Pool& apool,
1.25 paf 77: const String& aname,
1.40 paf 78: const Junction& ajunction/*info: always method-junction*/,
79: VMethodFrame *acaller) :
1.36 paf 80: WContext(apool, 0 /* empty */, 0 /* no parent, junctions can be reattached only up to VMethodFrame */ ),
1.1 paf 81:
1.25 paf 82: fname(aname),
1.1 paf 83: junction(ajunction),
1.40 paf 84: fcaller(acaller),
1.1 paf 85: store_param_index(0),
1.25 paf 86:
87: my(apool),
88: fnumbered_params(apool, aname),
89:
1.15 parser 90: fself(0),
1.36 paf 91: fresult_initial_void(0) {
1.1 paf 92:
1.25 paf 93: if(has_my()) { // this method uses named params?
94: const Method &method=*junction.method;
1.1 paf 95: if(method.locals_names) { // are there any local var names?
96: // remember them
1.25 paf 97: // those are flags that fname is local == to be looked up in 'my'
1.1 paf 98: for(int i=0; i<method.locals_names->size(); i++) {
1.25 paf 99: // speedup: not checking for clash with "result" fname
1.12 parser 100: Value *value=NEW VVoid(pool());
1.25 paf 101: const String& fname=*method.locals_names->get_string(i);
102: set_my_variable(fname, value);
1.1 paf 103: }
104: }
105: { // always there is one local: $result
1.15 parser 106: fresult_initial_void=NEW VVoid(pool());
1.18 paf 107: set_my_variable(*result_var_name, fresult_initial_void);
1.1 paf 108: }
109: }
110: }
111:
1.25 paf 112: const String& name() { return fname; }
1.40 paf 113: VMethodFrame *caller() { return fcaller; }
1.25 paf 114:
1.38 paf 115: void set_self(Value& aself) { fself=&aself; }
1.41 ! paf 116: /// we sure that someone already set our self with VMethodFrame::set_self(Value&)
! 117: Value& self() { return *fself; }
1.1 paf 118:
1.27 paf 119: bool can_store_param() {
120: const Method& method=*junction.method;
121: return method.params_names && store_param_index<method.params_names->size();
122: }
1.26 paf 123: void store_param(Value *value) {
1.1 paf 124: const Method& method=*junction.method;
125: int max_params=
126: method.max_numbered_params_count?method.max_numbered_params_count:
127: method.params_names?method.params_names->size():
128: 0;
129: if(store_param_index==max_params)
1.23 paf 130: throw Exception("parser.runtime",
1.26 paf 131: &name(),
1.7 paf 132: "method of %s (%s) accepts maximum %d parameter(s)",
1.38 paf 133: junction.self.get_class()->name_cstr(),
134: junction.self.type(),
1.1 paf 135: max_params);
136:
137: if(method.max_numbered_params_count) { // are this method params numbered?
1.25 paf 138: fnumbered_params+=value;
1.1 paf 139: } else { // named param
1.25 paf 140: // speedup: not checking for clash with "result" fname
141: const String& fname=*method.params_names->get_string(store_param_index);
142: set_my_variable(fname, value);
1.1 paf 143: }
144: store_param_index++;
145: }
146: void fill_unspecified_params() {
147: const Method &method=*junction.method;
148: if(method.params_names) // there are any named parameters might need filling?
149: for(; store_param_index<method.params_names->size(); store_param_index++) {
1.25 paf 150: const String& fname=*method.params_names->get_string(store_param_index);
151: my.put(fname, NEW VVoid(pool()));
1.1 paf 152: }
153: }
154:
1.25 paf 155: MethodParams *numbered_params() { return &fnumbered_params; }
1.18 paf 156:
157: private:
158:
1.25 paf 159: bool has_my() {
160: return junction.method->max_numbered_params_count==0;
161: }
162:
163: void set_my_variable(const String& fname, Value *value) {
164: my.put(fname, value); // remember param
1.20 paf 165: }
166:
167: Value *get_result_variable() {
1.25 paf 168: Value *result=has_my()?static_cast<Value*>(my.get(*result_var_name)):0;
1.20 paf 169: return result && result!=fresult_initial_void ? result : 0;
1.18 paf 170: }
1.1 paf 171:
172: public:
173:
174: const Junction& junction;
175:
176: private:
1.35 paf 177:
1.25 paf 178: const String& fname;
1.40 paf 179: VMethodFrame *fcaller;
1.25 paf 180:
1.1 paf 181: int store_param_index;
1.25 paf 182: Hash my;/*OR*/MethodParams fnumbered_params;
1.1 paf 183: Value *fself;
1.15 parser 184:
185: private:
1.35 paf 186:
1.15 parser 187: Value *fresult_initial_void;
1.1 paf 188:
1.41 ! paf 189: };
! 190:
! 191: /// Auto-object used for temporary changing VMethod_frame::fself.
! 192: class Temp_method_frame_self {
! 193: VMethodFrame& fmethod_frame;
! 194: Value& saved_self;
! 195: public:
! 196: Temp_method_frame_self(VMethodFrame& amethod_frame, Value& aself) :
! 197: fmethod_frame(amethod_frame),
! 198: saved_self(amethod_frame.self()) {
! 199: fmethod_frame.set_self(aself);
! 200: }
! 201: ~Temp_method_frame_self() {
! 202: fmethod_frame.set_self(saved_self);
! 203: }
1.1 paf 204: };
205:
206: #endif
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