1/* -----------------------------------------------------------------------------
2 * See the LICENSE file for information on copyright, usage and redistribution
3 * of SWIG, and the README file for authors - http://www.swig.org/release.html.
4 *
5 * fragment.c
6 *
7 * This file manages named code fragments.  Code fragments are typically
8 * used to hold helper-code that may or may not be included in the wrapper
9 * file (depending on what features are actually used in the interface).
10 *
11 * By using fragments, it's possible to greatly reduce the amount of
12 * wrapper code and to generate cleaner wrapper files.
13 * ----------------------------------------------------------------------------- */
14
15char cvsroot_fragment_c[] = "$Id: fragment.c 9632 2007-01-03 20:58:19Z beazley $";
16
17#include "swig.h"
18#include "swigwarn.h"
19
20static Hash *fragments = 0;
21static Hash *looking_fragments = 0;
22static int debug = 0;
23
24
25/* -----------------------------------------------------------------------------
26 * Swig_fragment_register()
27 *
28 * Add a fragment. Use the original Node*, so, if something needs to be
29 * changed, lang.cxx doesn't nedd to be touched again.
30 * ----------------------------------------------------------------------------- */
31
32void Swig_fragment_register(Node *fragment) {
33  if (Getattr(fragment, "emitonly")) {
34    Swig_fragment_emit(fragment);
35    return;
36  } else {
37    String *name = Copy(Getattr(fragment, "value"));
38    String *type = Getattr(fragment, "type");
39    if (type) {
40      SwigType *rtype = SwigType_typedef_resolve_all(type);
41      String *mangle = Swig_string_mangle(type);
42      Append(name, mangle);
43      Delete(mangle);
44      Delete(rtype);
45      if (debug)
46	Printf(stdout, "register fragment %s %s\n", name, type);
47    }
48    if (!fragments) {
49      fragments = NewHash();
50    }
51    if (!Getattr(fragments, name)) {
52      String *section = Copy(Getattr(fragment, "section"));
53      String *ccode = Copy(Getattr(fragment, "code"));
54      Hash *kwargs = Getattr(fragment, "kwargs");
55      Setmeta(ccode, "section", section);
56      if (kwargs) {
57	Setmeta(ccode, "kwargs", kwargs);
58      }
59      Setattr(fragments, name, ccode);
60      if (debug)
61	Printf(stdout, "registering fragment %s %s\n", name, section);
62      Delete(section);
63      Delete(ccode);
64    }
65    Delete(name);
66  }
67}
68
69/* -----------------------------------------------------------------------------
70 * Swig_fragment_emit()
71 *
72 * Emit a fragment
73 * ----------------------------------------------------------------------------- */
74
75static
76char *char_index(char *str, char c) {
77  while (*str && (c != *str))
78    ++str;
79  return (c == *str) ? str : 0;
80}
81
82void Swig_fragment_emit(Node *n) {
83  String *code;
84  char *pc, *tok;
85  String *t;
86  String *mangle = 0;
87  String *name = 0;
88  String *type = 0;
89
90  if (!fragments) {
91    Swig_warning(WARN_FRAGMENT_NOT_FOUND, Getfile(n), Getline(n), "Fragment '%s' not found.\n", name);
92    return;
93  }
94
95
96  name = Getattr(n, "value");
97  if (!name) {
98    name = n;
99  }
100  type = Getattr(n, "type");
101  if (type) {
102    mangle = Swig_string_mangle(type);
103  }
104
105  if (debug)
106    Printf(stdout, "looking fragment %s %s\n", name, type);
107  t = Copy(name);
108  tok = Char(t);
109  pc = char_index(tok, ',');
110  if (pc)
111    *pc = 0;
112  while (tok) {
113    String *name = NewString(tok);
114    if (mangle)
115      Append(name, mangle);
116    if (looking_fragments && Getattr(looking_fragments, name)) {
117      return;
118    }
119    code = Getattr(fragments, name);
120    if (debug)
121      Printf(stdout, "looking subfragment %s\n", name);
122    if (code && (Strcmp(code, "ignore") != 0)) {
123      String *section = Getmeta(code, "section");
124      Hash *nn = Getmeta(code, "kwargs");
125      if (!looking_fragments)
126	looking_fragments = NewHash();
127      Setattr(looking_fragments, name, "1");
128      while (nn) {
129	if (Equal(Getattr(nn, "name"), "fragment")) {
130	  if (debug)
131	    Printf(stdout, "emitting fragment %s %s\n", nn, type);
132	  Setfile(nn, Getfile(n));
133	  Setline(nn, Getline(n));
134	  Swig_fragment_emit(nn);
135	}
136	nn = nextSibling(nn);
137      }
138      if (section) {
139	File *f = Swig_filebyname(section);
140	if (!f) {
141	  Swig_error(Getfile(code), Getline(code), "Bad section '%s' for code fragment '%s'\n", section, name);
142	} else {
143	  if (debug)
144	    Printf(stdout, "emitting subfragment %s %s\n", name, section);
145	  if (debug)
146	    Printf(f, "/* begin fragment %s */\n", name);
147	  Printf(f, "%s\n", code);
148	  if (debug)
149	    Printf(f, "/* end fragment %s */\n\n", name);
150	  Setattr(fragments, name, "ignore");
151	  Delattr(looking_fragments, name);
152	}
153      }
154    } else if (!code && type) {
155      SwigType *rtype = SwigType_typedef_resolve_all(type);
156      if (!Equal(type, rtype)) {
157	String *name = Copy(Getattr(n, "value"));
158	String *mangle = Swig_string_mangle(type);
159	Append(name, mangle);
160	Setfile(name, Getfile(n));
161	Setline(name, Getline(n));
162	Swig_fragment_emit(name);
163	Delete(mangle);
164	Delete(name);
165      }
166      Delete(rtype);
167    }
168
169    if (!code) {
170      Swig_warning(WARN_FRAGMENT_NOT_FOUND, Getfile(n), Getline(n), "Fragment '%s' not found.\n", name);
171    }
172    tok = pc ? pc + 1 : 0;
173    if (tok) {
174      pc = char_index(tok, ',');
175      if (pc)
176	*pc = 0;
177    }
178    Delete(name);
179  }
180  Delete(t);
181}
182