ARB
aisc_eval.h
Go to the documentation of this file.
1 // Coded by Ralf Westram (coder@reallysoft.de) in March 2011 //
2 // Institute of Microbiology (Technical University Munich) //
3 // http://www.arb-home.de/ //
4 
5 #ifndef AISC_EVAL_H
6 #define AISC_EVAL_H
7 
8 #ifndef AISC_DEF_H
9 #include "aisc_def.h"
10 #endif
11 #ifndef AISC_LOCATION_H
12 #include "aisc_location.h"
13 #endif
14 #ifndef ARBTOOLS_H
15 #include <arbtools.h>
16 #endif
17 
18 class Expression : virtual Noncopyable {
19  const Data& data;
20  const Location& loc;
21 
22  int used; // currently used size
23  int bufsize; // including zero-byte
24  char *ebuffer;
25 
26  bool allow_missing_ref;
27 
28  bool was_evaluated;
29  int errors_before;
30 
31  char *eval_math(char *expr, char op_char);
32  char *evalPart(int start, int end, int& result_len);
33 
34  bool evalRest(int offset);
35 
36  char *evalBehind(int offset) {
37  aisc_assert(!was_evaluated);
38  char *toEval = strstr(ebuffer+offset, "$(");
39  return (!toEval || evalRest(toEval-ebuffer)) ? ebuffer : NULp;
40  }
41 
42 
43  char *report_result(char *s, bool& failed) {
44  int errors_after = Location::get_error_count();
45  failed = errors_after != errors_before;
46 
47  aisc_assert(!(failed && s));
48  if (s) {
49  aisc_assert(s == ebuffer);
50  ebuffer = NULp; // now owned by caller
51  }
52 
53  was_evaluated = true;
54  return s;
55  }
56 
57 public:
58  Expression(const Data& data_, const Location& loc_, const char *str, bool allow_missing_ref_)
59  : data(data_),
60  loc(loc_),
61  allow_missing_ref(allow_missing_ref_),
62  was_evaluated(false),
63  errors_before(Location::get_error_count())
64  {
65  used = strlen(str);
66  bufsize = used*2+1;
67  ebuffer = (char*)malloc(bufsize);
68  aisc_assert(used<bufsize);
69  memcpy(ebuffer, str, used+1);
70  }
72  aisc_assert(was_evaluated); // useless Expression
73  free(ebuffer);
74  }
75 
76  char *evaluate(bool& failed) {
77  return report_result(evalBehind(0), failed);
78  }
79 
80  char *evalVarDecl(bool& failed) {
81  // dont eval first '$('
82 
83  char *res = NULp;
84  char *varDecl = strstr(ebuffer, "$(");
85  if (varDecl) {
86  res = evalBehind((varDecl+2)-ebuffer);
87  }
88  else {
89  print_error(&loc, "Expected identifier, i.e. '$(ident)'");
90  }
91  return report_result(res, failed);
92  }
93 };
94 
95 
96 
97 #else
98 #error aisc_eval.h included twice
99 #endif // AISC_EVAL_H
~Expression()
Definition: aisc_eval.h:71
static HelixNrInfo * start
static int get_error_count()
Definition: aisc_location.h:61
#define print_error(code_or_loc, err)
Definition: aisc_def.h:47
#define false
Definition: ureadseq.h:13
char * evalVarDecl(bool &failed)
Definition: aisc_eval.h:80
char * evaluate(bool &failed)
Definition: aisc_eval.h:76
#define NULp
Definition: cxxforward.h:97
Expression(const Data &data_, const Location &loc_, const char *str, bool allow_missing_ref_)
Definition: aisc_eval.h:58
#define offset(field)
Definition: GLwDrawA.c:73
#define aisc_assert(cond)
Definition: aisc_def.h:11
GB_write_int const char s
Definition: AW_awar.cxx:156