Annotation of parser3/src/types/pa_vmethod_frame.h, revision 1.43
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:
1.42 paf 11: static const char* IDENT_VMETHOD_FRAME_H="$Date: 2002/10/15 10:58:34 $";
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:
1.42 paf 20: #define CALLER_ELEMENT_NAME "caller"
21: #define SELF_ELEMENT_NAME "self"
1.40 paf 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:
1.42 paf 49: if(aname==CALLER_ELEMENT_NAME)
1.40 paf 50: return caller();
1.42 paf 51:
52: if(aname==SELF_ELEMENT_NAME)
53: return &self();
1.40 paf 54:
55: return 0;
1.1 paf 56: }
1.4 paf 57: /// VMethodFrame: my or self_transparent
1.32 paf 58: /*override*/ bool put_element(const String& aname, Value *avalue, bool replace) {
59: if(junction.method->max_numbered_params_count==0 && my.put_replace(aname, avalue))
60: return true;
61:
1.41 paf 62: return self().put_element(aname, avalue, replace);
1.1 paf 63: }
64:
1.4 paf 65: /// VMethodFrame: self_transparent
1.41 paf 66: VStateless_class* get_class() { return self().get_class(); }
1.1 paf 67:
1.30 paf 68: public: // WContext
1.1 paf 69:
1.35 paf 70: /* override */ StringOrValue result() {
1.1 paf 71: // check the $result value
1.24 paf 72: Value *result_value=get_result_variable();
1.1 paf 73: // if we have one, return it, else return as usual: accumulated fstring or fvalue
1.24 paf 74: return result_value ? StringOrValue(0, result_value) : WContext::result();
1.1 paf 75: }
76:
77: public: // usage
78:
79: VMethodFrame(Pool& apool,
1.25 paf 80: const String& aname,
1.40 paf 81: const Junction& ajunction/*info: always method-junction*/,
82: VMethodFrame *acaller) :
1.36 paf 83: WContext(apool, 0 /* empty */, 0 /* no parent, junctions can be reattached only up to VMethodFrame */ ),
1.1 paf 84:
1.25 paf 85: fname(aname),
1.1 paf 86: junction(ajunction),
1.40 paf 87: fcaller(acaller),
1.1 paf 88: store_param_index(0),
1.25 paf 89:
90: my(apool),
91: fnumbered_params(apool, aname),
92:
1.15 parser 93: fself(0),
1.36 paf 94: fresult_initial_void(0) {
1.1 paf 95:
1.25 paf 96: if(has_my()) { // this method uses named params?
97: const Method &method=*junction.method;
1.1 paf 98: if(method.locals_names) { // are there any local var names?
99: // remember them
1.25 paf 100: // those are flags that fname is local == to be looked up in 'my'
1.1 paf 101: for(int i=0; i<method.locals_names->size(); i++) {
1.25 paf 102: // speedup: not checking for clash with "result" fname
1.12 parser 103: Value *value=NEW VVoid(pool());
1.25 paf 104: const String& fname=*method.locals_names->get_string(i);
105: set_my_variable(fname, value);
1.1 paf 106: }
107: }
108: { // always there is one local: $result
1.15 parser 109: fresult_initial_void=NEW VVoid(pool());
1.18 paf 110: set_my_variable(*result_var_name, fresult_initial_void);
1.1 paf 111: }
112: }
113: }
114:
1.25 paf 115: const String& name() { return fname; }
1.40 paf 116: VMethodFrame *caller() { return fcaller; }
1.25 paf 117:
1.38 paf 118: void set_self(Value& aself) { fself=&aself; }
1.41 paf 119: /// we sure that someone already set our self with VMethodFrame::set_self(Value&)
120: Value& self() { return *fself; }
1.1 paf 121:
1.27 paf 122: bool can_store_param() {
123: const Method& method=*junction.method;
124: return method.params_names && store_param_index<method.params_names->size();
125: }
1.26 paf 126: void store_param(Value *value) {
1.1 paf 127: const Method& method=*junction.method;
128: int max_params=
129: method.max_numbered_params_count?method.max_numbered_params_count:
130: method.params_names?method.params_names->size():
131: 0;
132: if(store_param_index==max_params)
1.23 paf 133: throw Exception("parser.runtime",
1.26 paf 134: &name(),
1.7 paf 135: "method of %s (%s) accepts maximum %d parameter(s)",
1.38 paf 136: junction.self.get_class()->name_cstr(),
137: junction.self.type(),
1.1 paf 138: max_params);
139:
140: if(method.max_numbered_params_count) { // are this method params numbered?
1.25 paf 141: fnumbered_params+=value;
1.1 paf 142: } else { // named param
1.25 paf 143: // speedup: not checking for clash with "result" fname
144: const String& fname=*method.params_names->get_string(store_param_index);
145: set_my_variable(fname, value);
1.1 paf 146: }
147: store_param_index++;
148: }
149: void fill_unspecified_params() {
150: const Method &method=*junction.method;
151: if(method.params_names) // there are any named parameters might need filling?
152: for(; store_param_index<method.params_names->size(); store_param_index++) {
1.25 paf 153: const String& fname=*method.params_names->get_string(store_param_index);
154: my.put(fname, NEW VVoid(pool()));
1.1 paf 155: }
156: }
157:
1.25 paf 158: MethodParams *numbered_params() { return &fnumbered_params; }
1.18 paf 159:
160: private:
161:
1.25 paf 162: bool has_my() {
163: return junction.method->max_numbered_params_count==0;
164: }
165:
166: void set_my_variable(const String& fname, Value *value) {
167: my.put(fname, value); // remember param
1.20 paf 168: }
169:
170: Value *get_result_variable() {
1.25 paf 171: Value *result=has_my()?static_cast<Value*>(my.get(*result_var_name)):0;
1.20 paf 172: return result && result!=fresult_initial_void ? result : 0;
1.18 paf 173: }
1.1 paf 174:
175: public:
176:
177: const Junction& junction;
178:
179: private:
1.35 paf 180:
1.25 paf 181: const String& fname;
1.40 paf 182: VMethodFrame *fcaller;
1.25 paf 183:
1.1 paf 184: int store_param_index;
1.25 paf 185: Hash my;/*OR*/MethodParams fnumbered_params;
1.1 paf 186: Value *fself;
1.15 parser 187:
188: private:
1.35 paf 189:
1.15 parser 190: Value *fresult_initial_void;
1.1 paf 191:
1.41 paf 192: };
193:
194: /// Auto-object used for temporary changing VMethod_frame::fself.
195: class Temp_method_frame_self {
196: VMethodFrame& fmethod_frame;
197: Value& saved_self;
198: public:
199: Temp_method_frame_self(VMethodFrame& amethod_frame, Value& aself) :
200: fmethod_frame(amethod_frame),
201: saved_self(amethod_frame.self()) {
202: fmethod_frame.set_self(aself);
203: }
204: ~Temp_method_frame_self() {
205: fmethod_frame.set_self(saved_self);
206: }
1.1 paf 207: };
208:
209: #endif
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