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88 lines
1.8 KiB
C
88 lines
1.8 KiB
C
/*
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* subst.h - Substitution rules
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*
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* Copyright 2012 by Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#ifndef SUBST_H
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#define SUBST_H
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#include <stdio.h>
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#include <sys/types.h>
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#include <regex.h>
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#include "relop.h"
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#define NMATCH 10 /* $0 (not used), $1...$9 */
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enum chunk_type {
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ct_string,
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ct_var,
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ct_sub,
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};
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struct chunk {
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enum chunk_type type;
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union {
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const char *s;
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const char *var;
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int sub; /* 0 if $$ */
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} u;
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struct chunk *next;
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};
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enum subst_type {
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st_match, /* try to match a variable */
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st_assign, /* assign to a variable */
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st_end, /* end the substitutions, accepting the part */
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st_ignore, /* ignore the part */
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st_break, /* jump to an outer block */
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st_continue, /* repeat an outer block */
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};
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struct subst {
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enum subst_type type;
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union {
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struct {
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const char *src;
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regex_t re;
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struct subst *block;
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char units[NMATCH-1];
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} match;
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struct {
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const char *dst;
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enum relop op;
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struct chunk *pat;
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} assign;
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const struct subst *jump;
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const char *tmp; /* jump target name; for subst_finalize */
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} u;
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const struct subst *prev; /* for tracking availability of variables */
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struct subst *next;
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};
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#define MULT_CHARS "GMkmunpf"
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struct subst *subst_match(const char *src, const char *re);
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struct subst *subst_assign(const char *dst, enum relop op, const char *pat);
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struct subst *subst_end(void);
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struct subst *subst_ignore(void);
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struct subst *subst_break(const char *block);
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struct subst *subst_continue(const char *block);
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void subst_finalize(struct subst *sub);
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void subst_dump(FILE *file, const struct subst *sub);
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#endif /* !SUBST_H */
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