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b2/: add processing of substitution rules
This commit is contained in:
Werner Almesberger
parent
9fd1dc56e7
commit
fd14c5200a
@ -13,7 +13,7 @@ SHELL = /bin/bash
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CFLAGS = -g -Wall $(shell pkg-config --cflags glib-2.0)
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SLOPPY = -Wno-unused -Wno-implicit-function-declaration
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OBJS = boom.o chr.o comp.o db.o dump.o eval.o param.o subst.o util.o \
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OBJS = boom.o chr.o comp.o db.o dump.o eval.o param.o subex.o subst.o util.o \
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lex.yy.o y.tab.o
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LDLIBS = -lfl $(shell pkg-config --libs glib-2.0)
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253
b2/subex.c
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253
b2/subex.c
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@ -0,0 +1,253 @@
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/*
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* subex.c - Substitution (execution)
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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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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/types.h>
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#include <regex.h>
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#include "util.h"
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#include "lang.h"
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#include "subst.h"
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#include "subex.h"
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#define FIELDS 10
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static const char *fn = NULL, *f[FIELDS];
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/* Jump target that can never be reached. */
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static struct subst jump_end;
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static void append_n(char **res, int *res_len, const char *s, int len)
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{
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if (!len)
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return;
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*res = realloc(*res, *res_len+len+1);
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if (!*res)
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abort();
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memcpy(*res+*res_len, s, len);
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*res_len += len;
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(*res)[*res_len] = 0;
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}
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static void append(char **res, int *res_len, const char *s)
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{
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append_n(res, res_len, s, strlen(s));
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}
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#if 0
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static void append_char(char **res, int *res_len, char c)
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{
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append_n(res, res_len, &c, 1);
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}
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#endif
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/*
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* TODO: decide what to do with units
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*/
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static char *compose(const struct chunk *c,
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const struct var *in, const struct var *out,
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const char *s, const regmatch_t *match)
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{
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char *res = stralloc("");
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int res_len = 0;
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const char *val;
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int n;
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while (c) {
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switch (c->type) {
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case ct_string:
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append(&res, &res_len, c->u.s);
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break;
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case ct_var:
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val = var_lookup(in, c->u.var);
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if (!val)
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val = var_lookup(out, c->u.var);
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if (!val)
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yyerrorf("unknown variable \"%s\"", c->u.var);
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append(&res, &res_len, val);
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break;
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case ct_sub:
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n = c->u.sub;
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if (!s)
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yyerrorf("$%c without prior match",
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n ? n+'0' : '$');
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if (!n) {
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append(&res, &res_len, s);
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break;
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}
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if (match[n-1].rm_so == -1)
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yyerrorf("substring $%d out of range", n);
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#if 0
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len = match[n-1].rm_eo-match[n-1].rm_so);
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tmp = alloc_size(len);
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memcpy(tmp, s+match[n-1].rm_so, len);
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tmp[len] = 0;
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tmp2 = canonicalize(tmp, c->unit);
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append(&res, &res_len, tmp2);
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#endif
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append_n(&res, &res_len, s+match[n-1].rm_so,
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match[n-1].rm_eo-match[n-1].rm_so);
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break;
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default:
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abort();
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}
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c = c->next;
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}
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return res;
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}
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struct var *make_var(const char *name, const char *val)
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{
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struct var *var;
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var = alloc_type(struct var);
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var->name = unique(name);
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var->value = unique(val);
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var->next = NULL;
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return var;
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}
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static void do_assign(const char *name, struct var **out, const char *val)
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{
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while (*out) {
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if ((*out)->name == name)
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break;
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out = &(*out)->next;
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}
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if (*out) {
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free((void *) (*out)->value);
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(*out)->value = val;
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} else {
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*out = make_var(name, val);
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}
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}
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static int do_match_1(const char *var, const regex_t *re,
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const struct var *in, const struct var *out,
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const char **val, regmatch_t *match)
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{
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*val = var_lookup(out, var);
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if (!*val)
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*val = var_lookup(in, var);
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if (!*val)
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return -1;
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return regexec(re, *val, 10, match, 0);
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}
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static int do_match(const char *var, const regex_t *re,
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const struct var *in, const struct var *out,
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const char **val, regmatch_t *match)
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{
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int i;
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if (var != fn)
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return do_match_1(var, re, in, out, val, match);
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for (i = 0; i != FIELDS; i++)
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if (!do_match_1(f[i], re, in, out, val, match))
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return 0;
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return -1;
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}
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static const struct subst *recurse_sub(const struct subst *sub,
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const struct var *in, const char *s, const regmatch_t *match,
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struct var **out)
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{
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const struct subst *jump;
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regmatch_t m_tmp[10];
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const char *val;
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char *tmp;
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while (sub) {
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switch (sub->type) {
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case st_match:
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if (do_match(sub->u.match.src, &sub->u.match.re,
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in, *out, &val, m_tmp))
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break;
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jump = recurse_sub(sub->u.match.block, in, val, m_tmp,
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out);
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if (jump && jump != sub)
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return jump;
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break;
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case st_assign:
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tmp = compose(sub->u.assign.pat, in, *out, s, match);
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do_assign(sub->u.assign.dst, out, tmp);
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break;
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case st_end:
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return &jump_end;
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case st_break:
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sub = sub->u.jump->next;
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continue;
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case st_again:
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sub = sub->u.jump->u.match.block;
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continue;
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default:
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abort();
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}
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sub = sub->next;
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}
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return NULL;
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}
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struct var *substitute(const struct subst *sub, const struct var *in)
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{
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struct var *out = NULL;
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int i;
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char tmp[4];
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if (!fn) {
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fn = unique("FN");
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for (i = 0; i != FIELDS; i++) {
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sprintf(tmp, "F%d", i);
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f[i] = unique(tmp);
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}
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}
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recurse_sub(sub, in, NULL, NULL, &out);
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return out;
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}
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const char *var_lookup(const struct var *vars, const char *name)
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{
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while (vars) {
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if (vars->name == name)
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return vars->value;
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vars = vars->next;
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}
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return NULL;
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}
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void free_vars(struct var *vars)
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{
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struct var *next;
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while (vars) {
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next = vars->next;
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free(vars);
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vars = next;
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}
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}
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31
b2/subex.h
Normal file
31
b2/subex.h
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@ -0,0 +1,31 @@
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/*
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* subex.h - Substitution (execution)
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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 SUBEX_H
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#define SUBEX_H
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#include "subst.h"
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struct var {
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const char *name;
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const char *value;
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struct var *next;
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};
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struct var *substitute(const struct subst *sub, const struct var *in);
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struct var *make_var(const char *name, const char *val);
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const char *var_lookup(const struct var *vars, const char *name);
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void free_vars(struct var *vars);
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#endif /* !SUBEX_H */
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