Include/grammar.h

   1 #ifndef Py_GRAMMAR_H
   2 #define Py_GRAMMAR_H
   3 #ifdef __cplusplus
   4 extern "C" {
   5 #endif
   6
   7 /***********************************************************
   8 Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
   9 The Netherlands.
  10
  11                         All Rights Reserved
  12
  13 Permission to use, copy, modify, and distribute this software and its
  14 documentation for any purpose and without fee is hereby granted,
  15 provided that the above copyright notice appear in all copies and that
  16 both that copyright notice and this permission notice appear in
  17 supporting documentation, and that the names of Stichting Mathematisch
  18 Centrum or CWI or Corporation for National Research Initiatives or
  19 CNRI not be used in advertising or publicity pertaining to
  20 distribution of the software without specific, written prior
  21 permission.
  22
  23 While CWI is the initial source for this software, a modified version
  24 is made available by the Corporation for National Research Initiatives
  25 (CNRI) at the Internet address ftp://ftp.python.org.
  26
  27 STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
  28 REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
  29 MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
  30 CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
  31 DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  32 PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  33 TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  34 PERFORMANCE OF THIS SOFTWARE.
  35
  36 ******************************************************************/
  37
  38 /* Grammar interface */
  39
  40 #include "bitset.h" /* Sigh... */
  41
  42 /* A label of an arc */
  43
  44 typedef struct {
  45         int     lb_type;
  46         char    *lb_str;
  47 } label;
  48
  49 #define EMPTY 0         /* Label number 0 is by definition the empty label */
  50
  51 /* A list of labels */
  52
  53 typedef struct {
  54         int     ll_nlabels;
  55         label   *ll_label;
  56 } labellist;
  57
  58 /* An arc from one state to another */
  59
  60 typedef struct {
  61         short           a_lbl;          /* Label of this arc */
  62         short           a_arrow;        /* State where this arc goes to */
  63 } arc;
  64
  65 /* A state in a DFA */
  66
  67 typedef struct {
  68         int              s_narcs;
  69         arc             *s_arc;         /* Array of arcs */
  70
  71         /* Optional accelerators */
  72         int              s_lower;       /* Lowest label index */
  73         int              s_upper;       /* Highest label index */
  74         int             *s_accel;       /* Accelerator */
  75         int              s_accept;      /* Nonzero for accepting state */
  76 } state;
  77
  78 /* A DFA */
  79
  80 typedef struct {
  81         int              d_type;        /* Non-terminal this represents */
  82         char            *d_name;        /* For printing */
  83         int              d_initial;     /* Initial state */
  84         int              d_nstates;
  85         state           *d_state;       /* Array of states */
  86         bitset           d_first;
  87 } dfa;
  88
  89 /* A grammar */
  90
  91 typedef struct {
  92         int              g_ndfas;
  93         dfa             *g_dfa;         /* Array of DFAs */
  94         labellist        g_ll;
  95         int              g_start;       /* Start symbol of the grammar */
  96         int              g_accel;       /* Set if accelerators present */
  97 } grammar;
  98
  99 /* FUNCTIONS */
 100
 101 grammar *newgrammar Py_PROTO((int start));
 102 dfa *adddfa Py_PROTO((grammar *g, int type, char *name));
 103 int addstate Py_PROTO((dfa *d));
 104 void addarc Py_PROTO((dfa *d, int from, int to, int lbl));
 105 dfa *PyGrammar_FindDFA Py_PROTO((grammar *g, int type));
 106 char *typename Py_PROTO((grammar *g, int lbl));
 107
 108 int addlabel Py_PROTO((labellist *ll, int type, char *str));
 109 int findlabel Py_PROTO((labellist *ll, int type, char *str));
 110 char *PyGrammar_LabelRepr Py_PROTO((label *lb));
 111 void translatelabels Py_PROTO((grammar *g));
 112
 113 void addfirstsets Py_PROTO((grammar *g));
 114
 115 void PyGrammar_AddAccelerators Py_PROTO((grammar *g));
 116 void PyGrammar_RemoveAccelerators Py_PROTO((grammar *));
 117
 118 void printgrammar Py_PROTO((grammar *g, FILE *fp));
 119 void printnonterminals Py_PROTO((grammar *g, FILE *fp));
 120
 121 #ifdef __cplusplus
 122 }
 123 #endif
 124 #endif /* !Py_GRAMMAR_H */