mirror of https://github.com/python/cpython.git
79 lines
1.8 KiB
C
79 lines
1.8 KiB
C
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/* Grammar interface */
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#include "bitset.h" /* Sigh... */
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/* A label of an arc */
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typedef struct _label {
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int lb_type;
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char *lb_str;
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} label;
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#define EMPTY 0 /* Label number 0 is by definition the empty label */
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/* A list of labels */
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typedef struct _labellist {
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int ll_nlabels;
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label *ll_label;
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} labellist;
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/* An arc from one state to another */
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typedef struct _arc {
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short a_lbl; /* Label of this arc */
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short a_arrow; /* State where this arc goes to */
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} arc;
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/* A state in a DFA */
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typedef struct _state {
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int s_narcs;
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arc *s_arc; /* Array of arcs */
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/* Optional accelerators */
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int s_lower; /* Lowest label index */
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int s_upper; /* Highest label index */
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int *s_accel; /* Accelerator */
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int s_accept; /* Nonzero for accepting state */
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} state;
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/* A DFA */
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typedef struct _dfa {
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int d_type; /* Non-terminal this represents */
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char *d_name; /* For printing */
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int d_initial; /* Initial state */
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int d_nstates;
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state *d_state; /* Array of states */
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bitset d_first;
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} dfa;
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/* A grammar */
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typedef struct _grammar {
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int g_ndfas;
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dfa *g_dfa; /* Array of DFAs */
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labellist g_ll;
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int g_start; /* Start symbol of the grammar */
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int g_accel; /* Set if accelerators present */
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} grammar;
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/* FUNCTIONS */
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grammar *newgrammar PROTO((int start));
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dfa *adddfa PROTO((grammar *g, int type, char *name));
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int addstate PROTO((dfa *d));
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void addarc PROTO((dfa *d, int from, int to, int lbl));
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dfa *finddfa PROTO((grammar *g, int type));
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char *typename PROTO((grammar *g, int lbl));
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int addlabel PROTO((labellist *ll, int type, char *str));
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int findlabel PROTO((labellist *ll, int type, char *str));
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char *labelrepr PROTO((label *lb));
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void translatelabels PROTO((grammar *g));
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void addfirstsets PROTO((grammar *g));
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void addaccellerators PROTO((grammar *g));
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