| 1 |
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| 2 | /* Grammar interface */
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| 3 |
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| 4 | #ifndef Py_GRAMMAR_H
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| 5 | #define Py_GRAMMAR_H
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| 6 | #ifdef __cplusplus
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| 7 | extern "C" {
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| 8 | #endif
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| 9 |
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| 10 | #include "bitset.h" /* Sigh... */
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| 11 |
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| 12 | /* A label of an arc */
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| 13 |
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| 14 | typedef struct {
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| 15 | int lb_type;
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| 16 | char *lb_str;
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| 17 | } label;
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| 18 |
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| 19 | #define EMPTY 0 /* Label number 0 is by definition the empty label */
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| 20 |
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| 21 | /* A list of labels */
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| 22 |
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| 23 | typedef struct {
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| 24 | int ll_nlabels;
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| 25 | label *ll_label;
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| 26 | } labellist;
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| 27 |
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| 28 | /* An arc from one state to another */
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| 29 |
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| 30 | typedef struct {
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| 31 | short a_lbl; /* Label of this arc */
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| 32 | short a_arrow; /* State where this arc goes to */
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| 33 | } arc;
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| 34 |
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| 35 | /* A state in a DFA */
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| 36 |
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| 37 | typedef struct {
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| 38 | int s_narcs;
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| 39 | arc *s_arc; /* Array of arcs */
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| 40 |
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| 41 | /* Optional accelerators */
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| 42 | int s_lower; /* Lowest label index */
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| 43 | int s_upper; /* Highest label index */
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| 44 | int *s_accel; /* Accelerator */
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| 45 | int s_accept; /* Nonzero for accepting state */
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| 46 | } state;
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| 47 |
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| 48 | /* A DFA */
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| 49 |
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| 50 | typedef struct {
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| 51 | int d_type; /* Non-terminal this represents */
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| 52 | char *d_name; /* For printing */
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| 53 | int d_initial; /* Initial state */
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| 54 | int d_nstates;
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| 55 | state *d_state; /* Array of states */
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| 56 | bitset d_first;
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| 57 | } dfa;
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| 58 |
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| 59 | /* A grammar */
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| 60 |
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| 61 | typedef struct {
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| 62 | int g_ndfas;
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| 63 | dfa *g_dfa; /* Array of DFAs */
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| 64 | labellist g_ll;
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| 65 | int g_start; /* Start symbol of the grammar */
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| 66 | int g_accel; /* Set if accelerators present */
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| 67 | } grammar;
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| 68 |
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| 69 | /* FUNCTIONS */
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| 70 |
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| 71 | grammar *newgrammar(int start);
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| 72 | dfa *adddfa(grammar *g, int type, char *name);
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| 73 | int addstate(dfa *d);
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| 74 | void addarc(dfa *d, int from, int to, int lbl);
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| 75 | dfa *PyGrammar_FindDFA(grammar *g, int type);
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| 76 |
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| 77 | int addlabel(labellist *ll, int type, char *str);
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| 78 | int findlabel(labellist *ll, int type, char *str);
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| 79 | char *PyGrammar_LabelRepr(label *lb);
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| 80 | void translatelabels(grammar *g);
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| 81 |
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| 82 | void addfirstsets(grammar *g);
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| 83 |
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| 84 | void PyGrammar_AddAccelerators(grammar *g);
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| 85 | void PyGrammar_RemoveAccelerators(grammar *);
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| 86 |
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| 87 | void printgrammar(grammar *g, FILE *fp);
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| 88 | void printnonterminals(grammar *g, FILE *fp);
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| 89 |
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| 90 | #ifdef __cplusplus
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| 91 | }
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| 92 | #endif
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| 93 | #endif /* !Py_GRAMMAR_H */
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