Annotation of parser3/src/types/pa_vmethod_frame.h, revision 1.45.2.8.2.9
1.3 paf 1: /** @file
1.5 paf 2: Parser: @b method_frame write context
1.3 paf 3:
1.45.2.5 paf 4: Copyright (c) 2001-2003 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:
1.45.2.8.2.9! paf 11: static const char* IDENT_VMETHOD_FRAME_H="$Date: 2003/03/24 09:39:56 $";
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"
16:
1.40 paf 17: // defines
18:
1.42 paf 19: #define CALLER_ELEMENT_NAME "caller"
20: #define SELF_ELEMENT_NAME "self"
1.40 paf 21:
1.45.2.1 paf 22: // forwards
23:
24: class Request;
25:
26: /**
27: @b method parameters passed in this array.
28: contains handy typecast ad junction/not junction ensurers
29:
30: */
1.45.2.8.2.5 paf 31: class MethodParams: public Array<Value*> {
1.45.2.1 paf 32: public:
33: /// handy is-value-a-junction ensurer
1.45.2.8.2.8 paf 34: Value& as_junction(int index, const char* msg) {
1.45.2.1 paf 35: return get_as(index, true, msg);
36: }
37: /// handy value-is-not-a-junction ensurer
1.45.2.8.2.8 paf 38: Value& as_no_junction(int index, const char* msg) {
1.45.2.1 paf 39: return get_as(index, false, msg);
40: }
41: /// handy expression auto-processing to double
1.45.2.5 paf 42: double as_double(int index, const char* msg, Request& r) {
1.45.2.8.2.8 paf 43: return get_processed(index, msg, r).as_double();
1.45.2.1 paf 44: }
45: /// handy expression auto-processing to int
1.45.2.5 paf 46: int as_int(int index, const char* msg, Request& r) {
1.45.2.8.2.8 paf 47: return get_processed(index, msg, r).as_int();
1.45.2.1 paf 48: }
49: /// handy expression auto-processing to bool
1.45.2.5 paf 50: bool as_bool(int index, const char* msg, Request& r) {
1.45.2.8.2.8 paf 51: return get_processed(index, msg, r).as_bool();
1.45.2.1 paf 52: }
53: /// handy string ensurer
1.45.2.8.2.1 paf 54: const String& as_string(int index, const char* msg) {
1.45.2.8.2.8 paf 55: return as_no_junction(index, msg).as_string();
1.45.2.1 paf 56: }
57:
58: private:
59:
60: /// handy value-is/not-a-junction ensurer
1.45.2.8.2.8 paf 61: Value& get_as(int index, bool as_junction, const char* msg) {
1.45.2.8.2.5 paf 62: Value* result=get(index);
1.45.2.1 paf 63: if((result->get_junction()!=0) ^ as_junction)
64: throw Exception("parser.runtime",
1.45.2.8.2.9! paf 65: 0,
1.45.2.1 paf 66: "%s (parameter #%d)", msg, 1+index);
67:
1.45.2.8.2.8 paf 68: return *result;
1.45.2.1 paf 69: }
70:
1.45.2.8.2.8 paf 71: Value& get_processed(int index, const char* msg, Request& r);
1.45.2.1 paf 72:
73: };
74:
1.4 paf 75: /** Method frame write context
76: accepts values written by method code
77: also handles method parameters and local variables
1.3 paf 78: */
1.45.2.1 paf 79: class VMethodFrame: public WContext {
80:
1.45.2.8.2.6 paf 81: // const String& fname;
1.45.2.1 paf 82: VMethodFrame *fcaller;
83:
84: int store_param_index;
1.45.2.8.2.5 paf 85: HashStringValue* my;/*OR*/MethodParams* fnumbered_params;
86: Value* fself;
1.45.2.1 paf 87:
1.45.2.8.2.5 paf 88: Value* fresult_initial_void;
1.45.2.1 paf 89:
1.1 paf 90: public: // Value
91:
1.45.2.5 paf 92: override const char* type() const { return "method_frame"; }
1.20 paf 93:
94: /// VMethodFrame: $result | parent get_string(=accumulated fstring)
1.45.2.8.2.5 paf 95: override const String* get_string() {
1.20 paf 96: // check the $result value
1.45.2.8.2.5 paf 97: Value* result=get_result_variable();
1.20 paf 98: // if we have one, return it's string value, else return as usual: accumulated fstring or fvalue
1.45.2.8.2.5 paf 99: return result ? result->get_string() : WContext::get_string();
1.20 paf 100: }
101:
1.40 paf 102: /// VMethodFrame: my or self_transparent or $caller
1.45.2.8.2.5 paf 103: override Value* get_element(const String& aname, Value& aself, bool looking_up) {
1.45.2.1 paf 104: if(my) {
1.45.2.8.2.5 paf 105: if(Value* result=my->get(aname))
1.1 paf 106: return result;
107: }
1.45.2.8.2.5 paf 108: if(Value* result=self().get_element(aname, aself, looking_up))
1.40 paf 109: return result;
110:
1.45.2.8.2.5 paf 111: if(aname==CALLER_ELEMENT_NAME)
112: return caller();
1.42 paf 113:
1.45.2.8.2.5 paf 114: if(aname==SELF_ELEMENT_NAME)
115: return &self();
1.40 paf 116:
1.45.2.8.2.5 paf 117: return 0;
1.1 paf 118: }
1.4 paf 119: /// VMethodFrame: my or self_transparent
1.45.2.8.2.5 paf 120: override bool put_element(const String& aname, Value* avalue, bool replace) {
1.45.2.1 paf 121: if(my && my->put_replace(aname, avalue))
1.32 paf 122: return true;
123:
1.41 paf 124: return self().put_element(aname, avalue, replace);
1.1 paf 125: }
126:
1.4 paf 127: /// VMethodFrame: self_transparent
1.45.2.1 paf 128: override VStateless_class* get_class() { return self().get_class(); }
1.44 paf 129:
130: /// VMethodFrame: self_transparent
1.45.2.8.2.5 paf 131: override Value* base() { return self().base(); }
1.1 paf 132:
1.30 paf 133: public: // WContext
1.1 paf 134:
1.45.2.1 paf 135: override StringOrValue result() {
1.1 paf 136: // check the $result value
1.45.2.8.2.5 paf 137: Value* result_value=get_result_variable();
1.1 paf 138: // if we have one, return it, else return as usual: accumulated fstring or fvalue
1.45.2.8.2.1 paf 139: return result_value ? StringOrValue(0, result_value) : WContext::result();
1.1 paf 140: }
141:
1.45.2.8.2.5 paf 142: void write(Value& avalue, String::Language alang) {
143: WContext::write(avalue, alang);
1.45.2.6 paf 144: }
145:
1.1 paf 146: public: // usage
147:
1.45.2.8.2.1 paf 148: VMethodFrame(
1.45.2.8.2.6 paf 149: //const String& aname,
1.40 paf 150: const Junction& ajunction/*info: always method-junction*/,
1.45.2.1 paf 151: VMethodFrame *acaller);
1.1 paf 152:
1.45.2.8.2.6 paf 153: // const String& name() { return fname; }
1.40 paf 154: VMethodFrame *caller() { return fcaller; }
1.25 paf 155:
1.45.2.8.2.6 paf 156: void set_self(Value& aself) { fself=&aself; }
1.41 paf 157: /// we sure that someone already set our self with VMethodFrame::set_self(Value&)
158: Value& self() { return *fself; }
1.1 paf 159:
1.27 paf 160: bool can_store_param() {
161: const Method& method=*junction.method;
1.45.2.1 paf 162: return method.params_names && store_param_index<method.params_names->count();
1.27 paf 163: }
1.45.2.8.2.7 paf 164: void store_param(Value& value) {
1.1 paf 165: const Method& method=*junction.method;
166: int max_params=
167: method.max_numbered_params_count?method.max_numbered_params_count:
1.45.2.1 paf 168: method.params_names?method.params_names->count():
1.1 paf 169: 0;
170: if(store_param_index==max_params)
1.23 paf 171: throw Exception("parser.runtime",
1.45.2.8.2.6 paf 172: 0, //&name(),
1.7 paf 173: "method of %s (%s) accepts maximum %d parameter(s)",
1.45.2.8.2.6 paf 174: junction.self.get_class()->name_cstr(),
175: junction.self.type(),
1.1 paf 176: max_params);
177:
1.45.2.1 paf 178: if(fnumbered_params) { // are this method params numbered?
1.45.2.8.2.7 paf 179: *fnumbered_params+=&value;
1.1 paf 180: } else { // named param
1.25 paf 181: // speedup: not checking for clash with "result" fname
1.45.2.8.2.5 paf 182: const String& fname=*(*method.params_names)[store_param_index];
1.25 paf 183: set_my_variable(fname, value);
1.1 paf 184: }
185: store_param_index++;
186: }
187: void fill_unspecified_params() {
188: const Method &method=*junction.method;
189: if(method.params_names) // there are any named parameters might need filling?
1.45.2.1 paf 190: for(; store_param_index<method.params_names->count(); store_param_index++) {
1.45.2.8.2.5 paf 191: const String& fname=*(*method.params_names)[store_param_index];
192: my->put(fname, new VVoid);
1.1 paf 193: }
194: }
195:
1.45.2.8.2.5 paf 196: MethodParams* numbered_params() { return fnumbered_params; }
1.18 paf 197:
198: private:
199:
1.45.2.8.2.7 paf 200: void set_my_variable(const String& fname, Value& value) {
201: my->put(fname, &value); // remember param
1.25 paf 202: }
203:
1.45.2.8.2.5 paf 204: Value* get_result_variable();
1.1 paf 205:
206: public:
207:
208: const Junction& junction;
209:
1.41 paf 210: };
211:
212: /// Auto-object used for temporary changing VMethod_frame::fself.
213: class Temp_method_frame_self {
214: VMethodFrame& fmethod_frame;
1.45.2.8.2.5 paf 215: Value* saved_self;
1.41 paf 216: public:
1.45.2.8.2.6 paf 217: Temp_method_frame_self(VMethodFrame& amethod_frame, Value& aself) :
1.41 paf 218: fmethod_frame(amethod_frame),
1.45.2.8.2.6 paf 219: saved_self(&amethod_frame.self()) {
1.41 paf 220: fmethod_frame.set_self(aself);
221: }
222: ~Temp_method_frame_self() {
1.45.2.8.2.6 paf 223: fmethod_frame.set_self(*saved_self);
1.41 paf 224: }
1.1 paf 225: };
226:
227: #endif
E-mail:
![[BACK]](/cvsweb/icons/back.gif){kind=icon}
Return to pa_vmethod_frame.h CVS log ![[TXT]](/cvsweb/icons/text.gif){kind=icon}
![[DIR]](/cvsweb/icons/dir.gif){kind=icon}
Up to [parser3project] / parser3 / src / types