Annotation of parser3/src/types/pa_vmethod_frame.h, revision 1.45.2.8.2.8
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:
1.45.2.8.2.8! paf 11: static const char* IDENT_VMETHOD_FRAME_H="$Date: 2003/03/21 15:36:04 $";
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:
1.45.2.8.2.1 paf 33: const String& fmethod_name;
1.45.2.1 paf 34:
35: public:
1.45.2.8.2.5 paf 36: MethodParams(const String& amethod_name):
1.45.2.1 paf 37: fmethod_name(amethod_name) {
38: }
39:
40: /// handy is-value-a-junction ensurer
1.45.2.8.2.8! paf 41: Value& as_junction(int index, const char* msg) {
1.45.2.1 paf 42: return get_as(index, true, msg);
43: }
44: /// handy value-is-not-a-junction ensurer
1.45.2.8.2.8! paf 45: Value& as_no_junction(int index, const char* msg) {
1.45.2.1 paf 46: return get_as(index, false, msg);
47: }
48: /// handy expression auto-processing to double
1.45.2.5 paf 49: double as_double(int index, const char* msg, Request& r) {
1.45.2.8.2.8! paf 50: return get_processed(index, msg, r).as_double();
1.45.2.1 paf 51: }
52: /// handy expression auto-processing to int
1.45.2.5 paf 53: int as_int(int index, const char* msg, Request& r) {
1.45.2.8.2.8! paf 54: return get_processed(index, msg, r).as_int();
1.45.2.1 paf 55: }
56: /// handy expression auto-processing to bool
1.45.2.5 paf 57: bool as_bool(int index, const char* msg, Request& r) {
1.45.2.8.2.8! paf 58: return get_processed(index, msg, r).as_bool();
1.45.2.1 paf 59: }
60: /// handy string ensurer
1.45.2.8.2.1 paf 61: const String& as_string(int index, const char* msg) {
1.45.2.8.2.8! paf 62: return as_no_junction(index, msg).as_string();
1.45.2.1 paf 63: }
64:
65: private:
66:
67: /// handy value-is/not-a-junction ensurer
1.45.2.8.2.8! paf 68: Value& get_as(int index, bool as_junction, const char* msg) {
1.45.2.8.2.5 paf 69: Value* result=get(index);
1.45.2.1 paf 70: if((result->get_junction()!=0) ^ as_junction)
71: throw Exception("parser.runtime",
1.45.2.8.2.5 paf 72: &fmethod_name,
1.45.2.1 paf 73: "%s (parameter #%d)", msg, 1+index);
74:
1.45.2.8.2.8! paf 75: return *result;
1.45.2.1 paf 76: }
77:
1.45.2.8.2.8! paf 78: Value& get_processed(int index, const char* msg, Request& r);
1.45.2.1 paf 79:
80: };
81:
1.4 paf 82: /** Method frame write context
83: accepts values written by method code
84: also handles method parameters and local variables
1.3 paf 85: */
1.45.2.1 paf 86: class VMethodFrame: public WContext {
87:
1.45.2.8.2.6 paf 88: // const String& fname;
1.45.2.1 paf 89: VMethodFrame *fcaller;
90:
91: int store_param_index;
1.45.2.8.2.5 paf 92: HashStringValue* my;/*OR*/MethodParams* fnumbered_params;
93: Value* fself;
1.45.2.1 paf 94:
1.45.2.8.2.5 paf 95: Value* fresult_initial_void;
1.45.2.1 paf 96:
1.1 paf 97: public: // Value
98:
1.45.2.5 paf 99: override const char* type() const { return "method_frame"; }
1.20 paf 100:
101: /// VMethodFrame: $result | parent get_string(=accumulated fstring)
1.45.2.8.2.5 paf 102: override const String* get_string() {
1.20 paf 103: // check the $result value
1.45.2.8.2.5 paf 104: Value* result=get_result_variable();
1.20 paf 105: // if we have one, return it's string value, else return as usual: accumulated fstring or fvalue
1.45.2.8.2.5 paf 106: return result ? result->get_string() : WContext::get_string();
1.20 paf 107: }
108:
1.40 paf 109: /// VMethodFrame: my or self_transparent or $caller
1.45.2.8.2.5 paf 110: override Value* get_element(const String& aname, Value& aself, bool looking_up) {
1.45.2.1 paf 111: if(my) {
1.45.2.8.2.5 paf 112: if(Value* result=my->get(aname))
1.1 paf 113: return result;
114: }
1.45.2.8.2.5 paf 115: if(Value* result=self().get_element(aname, aself, looking_up))
1.40 paf 116: return result;
117:
1.45.2.8.2.5 paf 118: if(aname==CALLER_ELEMENT_NAME)
119: return caller();
1.42 paf 120:
1.45.2.8.2.5 paf 121: if(aname==SELF_ELEMENT_NAME)
122: return &self();
1.40 paf 123:
1.45.2.8.2.5 paf 124: return 0;
1.1 paf 125: }
1.4 paf 126: /// VMethodFrame: my or self_transparent
1.45.2.8.2.5 paf 127: override bool put_element(const String& aname, Value* avalue, bool replace) {
1.45.2.1 paf 128: if(my && my->put_replace(aname, avalue))
1.32 paf 129: return true;
130:
1.41 paf 131: return self().put_element(aname, avalue, replace);
1.1 paf 132: }
133:
1.4 paf 134: /// VMethodFrame: self_transparent
1.45.2.1 paf 135: override VStateless_class* get_class() { return self().get_class(); }
1.44 paf 136:
137: /// VMethodFrame: self_transparent
1.45.2.8.2.5 paf 138: override Value* base() { return self().base(); }
1.1 paf 139:
1.30 paf 140: public: // WContext
1.1 paf 141:
1.45.2.1 paf 142: override StringOrValue result() {
1.1 paf 143: // check the $result value
1.45.2.8.2.5 paf 144: Value* result_value=get_result_variable();
1.1 paf 145: // if we have one, return it, else return as usual: accumulated fstring or fvalue
1.45.2.8.2.1 paf 146: return result_value ? StringOrValue(0, result_value) : WContext::result();
1.1 paf 147: }
148:
1.45.2.8.2.5 paf 149: void write(Value& avalue, String::Language alang) {
150: WContext::write(avalue, alang);
1.45.2.6 paf 151: }
152:
1.1 paf 153: public: // usage
154:
1.45.2.8.2.1 paf 155: VMethodFrame(
1.45.2.8.2.6 paf 156: //const String& aname,
1.40 paf 157: const Junction& ajunction/*info: always method-junction*/,
1.45.2.1 paf 158: VMethodFrame *acaller);
1.1 paf 159:
1.45.2.8.2.6 paf 160: // const String& name() { return fname; }
1.40 paf 161: VMethodFrame *caller() { return fcaller; }
1.25 paf 162:
1.45.2.8.2.6 paf 163: void set_self(Value& aself) { fself=&aself; }
1.41 paf 164: /// we sure that someone already set our self with VMethodFrame::set_self(Value&)
165: Value& self() { return *fself; }
1.1 paf 166:
1.27 paf 167: bool can_store_param() {
168: const Method& method=*junction.method;
1.45.2.1 paf 169: return method.params_names && store_param_index<method.params_names->count();
1.27 paf 170: }
1.45.2.8.2.7 paf 171: void store_param(Value& value) {
1.1 paf 172: const Method& method=*junction.method;
173: int max_params=
174: method.max_numbered_params_count?method.max_numbered_params_count:
1.45.2.1 paf 175: method.params_names?method.params_names->count():
1.1 paf 176: 0;
177: if(store_param_index==max_params)
1.23 paf 178: throw Exception("parser.runtime",
1.45.2.8.2.6 paf 179: 0, //&name(),
1.7 paf 180: "method of %s (%s) accepts maximum %d parameter(s)",
1.45.2.8.2.6 paf 181: junction.self.get_class()->name_cstr(),
182: junction.self.type(),
1.1 paf 183: max_params);
184:
1.45.2.1 paf 185: if(fnumbered_params) { // are this method params numbered?
1.45.2.8.2.7 paf 186: *fnumbered_params+=&value;
1.1 paf 187: } else { // named param
1.25 paf 188: // speedup: not checking for clash with "result" fname
1.45.2.8.2.5 paf 189: const String& fname=*(*method.params_names)[store_param_index];
1.25 paf 190: set_my_variable(fname, value);
1.1 paf 191: }
192: store_param_index++;
193: }
194: void fill_unspecified_params() {
195: const Method &method=*junction.method;
196: if(method.params_names) // there are any named parameters might need filling?
1.45.2.1 paf 197: for(; store_param_index<method.params_names->count(); store_param_index++) {
1.45.2.8.2.5 paf 198: const String& fname=*(*method.params_names)[store_param_index];
199: my->put(fname, new VVoid);
1.1 paf 200: }
201: }
202:
1.45.2.8.2.5 paf 203: MethodParams* numbered_params() { return fnumbered_params; }
1.18 paf 204:
205: private:
206:
1.45.2.8.2.7 paf 207: void set_my_variable(const String& fname, Value& value) {
208: my->put(fname, &value); // remember param
1.25 paf 209: }
210:
1.45.2.8.2.5 paf 211: Value* get_result_variable();
1.1 paf 212:
213: public:
214:
215: const Junction& junction;
216:
1.41 paf 217: };
218:
219: /// Auto-object used for temporary changing VMethod_frame::fself.
220: class Temp_method_frame_self {
221: VMethodFrame& fmethod_frame;
1.45.2.8.2.5 paf 222: Value* saved_self;
1.41 paf 223: public:
1.45.2.8.2.6 paf 224: Temp_method_frame_self(VMethodFrame& amethod_frame, Value& aself) :
1.41 paf 225: fmethod_frame(amethod_frame),
1.45.2.8.2.6 paf 226: saved_self(&amethod_frame.self()) {
1.41 paf 227: fmethod_frame.set_self(aself);
228: }
229: ~Temp_method_frame_self() {
1.45.2.8.2.6 paf 230: fmethod_frame.set_self(*saved_self);
1.41 paf 231: }
1.1 paf 232: };
233:
234: #endif
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