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git://projects.qi-hardware.com/eda-tools.git
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b2/: finish unit handling and move most of its processing to the match side
The ${foo#unit} syntax didn't really make sense because it created
a large number of potential error conditions on the assignment side
and didn't help with finding compatible fields.
With all this moved to the match side, an invalid syntax simply causes
a mismatch.
This commit is contained in:
Werner Almesberger
parent
adecef8d4a
commit
99e5777448
22
b2/SUBST
22
b2/SUBST
@ -1,14 +1,18 @@
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REF=R[0-9]* {
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T=R
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VAL=* { R=$$#R }
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VAL=(#R) { R=$1 }
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TOL = 5%
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FN=*% { TOL=${$#%} }
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FN=*% { TOL=$$ }
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break REF
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// end break again
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}
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/*
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pattern: () * ? .
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pattern:
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() | like in RE
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* ? like in glob
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(#U) expect a numeric value of unit U (use substring to get canonical value)
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subst: $1 ... $field
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substring:
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@ -17,9 +21,15 @@ variable:
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$foo, ...
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with curly braces:
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${foo}, ...
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unit conversion:
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$foo#V
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${1#R}
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input variable:
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$$
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Caveat:
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Wrong: FN=* { X=$FN } there is no variable called FN
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Right: FN=* { X=$$ } yields the Fn field selected by FN
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Wrong: VAL=(#R) { R=$VAL } yields literal value
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Wrong: VAL=(#R) { R=$$ } yields literal value
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Right: VAL=(#R) { R=$1 } yield canonicalized value
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*/
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80
b2/subex.c
80
b2/subex.c
@ -13,8 +13,10 @@
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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 <ctype.h>
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#include <sys/types.h>
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#include <regex.h>
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#include <assert.h>
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#include "util.h"
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#include "vstring.h"
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@ -32,17 +34,66 @@ static const char *fn = NULL, *f[FIELDS];
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static struct subst jump_end;
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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 *canonicalize(const char *s, char unit)
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{
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char *res;
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int res_len = 0;
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int seen_dot = 0;
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int seen_unit = 0;
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char mult = 0;
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if (!unit)
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return stralloc(s);
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res = stralloc("");
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while (*s) {
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if (*s == unit) {
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assert(!seen_unit);
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if (!s[1])
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break;
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if (!seen_dot)
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append_char(&res, &res_len, '.');
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seen_unit = seen_dot = 1;
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s++;
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continue;
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}
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if (*s == '.') {
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assert(!seen_dot);
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append_char(&res, &res_len, '.');
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seen_dot = 1;
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} else if (*s == '-' || isdigit(*s)) {
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append_char(&res, &res_len, *s);
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s++;
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continue;
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} else if (strchr(MULT_CHARS, *s)) {
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assert(!seen_unit);
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assert(!mult);
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mult = *s;
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if (!seen_dot)
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append_char(&res, &res_len, '.');
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seen_dot = 1;
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} else {
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abort();
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}
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s++;
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}
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if (res_len && res[res_len-1] == '.')
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res_len--;
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if (mult)
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append_char(&res, &res_len, mult);
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append_char(&res, &res_len, unit);
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return res;
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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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const char *s, const regmatch_t *match, const char *units)
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{
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char *res = stralloc("");
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int res_len = 0;
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int res_len = 0, len;
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const char *val;
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char *tmp, *tmp2;
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int n;
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while (c) {
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@ -69,16 +120,14 @@ static char *compose(const struct chunk *c,
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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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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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tmp2 = canonicalize(tmp, units ? units[n-1] : 0);
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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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free(tmp);
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free(tmp2);
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break;
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default:
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abort();
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@ -147,7 +196,7 @@ static int do_match(const char *var, const regex_t *re,
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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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const char *units, 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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@ -161,12 +210,13 @@ static const struct subst *recurse_sub(const struct subst *sub,
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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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sub->u.match.units, 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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tmp = compose(sub->u.assign.pat, in, *out, s, match,
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units);
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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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@ -199,7 +249,7 @@ struct var *substitute(const struct subst *sub, const struct var *in)
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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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recurse_sub(sub, in, NULL, NULL, NULL, &out);
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return out;
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}
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72
b2/subst.c
72
b2/subst.c
@ -38,11 +38,33 @@ static struct subst *alloc_subst(enum subst_type type)
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}
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static char *prepare_re(const char *re)
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/*
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* With M the SI multiplier prefixes and U the unit character, our regexp
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* is
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*
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* (-?[0-9]+\.?[[0-9]*M?U?|-?[0-9]+[UM][0-9]*)
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*
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* The first part is for things like 10, 1.2k, 3.3V, -2mA, etc.
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* The second part is for things like 1k20, 1R2, etc.
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*/
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static void unit_expr(char **res, int *res_len, char unit)
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{
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append(res, res_len, "(-?[0-9]+\\.?[0-9]*[" MULT_CHARS "]?");
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append_char(res, res_len, unit);
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append(res, res_len, "?|-?[0-9]+[");
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append_char(res, res_len, unit);
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append(res, res_len, MULT_CHARS "][0-9]*)");
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}
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static char *prepare_re(const char *re, int *parens, char *units)
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{
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char *res = NULL;
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int res_len = 0;
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*parens = 0;
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memset(units, 0, 10);
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append_char(&res, &res_len, '^');
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while (*re) {
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switch (*re) {
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@ -61,6 +83,16 @@ static char *prepare_re(const char *re)
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append_n(&res, &res_len, re, 2);
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re++;
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break;
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case '(':
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(*parens)++;
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if (re[1] == '#' && re[2] && isalpha(re[2]) &&
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re[3] == ')') {
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units[*parens-1] = re[2];
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unit_expr(&res, &res_len, re[2]);
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re += 3;
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break;
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}
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/* fall through */
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default:
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append_char(&res, &res_len, *re);
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}
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@ -77,11 +109,11 @@ struct subst *subst_match(const char *src, const char *re)
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char error[1000];
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struct subst *sub;
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char *tmp;
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int err;
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int parens, err;
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sub = alloc_subst(st_match);
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sub->u.match.src = src;
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tmp = prepare_re(re);
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tmp = prepare_re(re, &parens, sub->u.match.units);
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err = regcomp(&sub->u.match.re, tmp, REG_EXTENDED);
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free(tmp);
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if (err) {
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@ -102,7 +134,6 @@ static void end_chunk(struct chunk ***last, const char *start, const char *s)
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c = alloc_type(struct chunk);
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c->type = ct_string;
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c->u.s = stralloc_n(start, s-start);;
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c->unit = NULL;
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c->next = NULL;
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**last = c;
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*last = &c->next;
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@ -154,28 +185,9 @@ static const char *parse_var(struct chunk *c, const char *s)
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c->u.sub = 0;
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}
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if (*t != '#') {
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if (braced) {
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assert(*t == '}');
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t++;
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}
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return t;
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}
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s = ++t;
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while (*t) {
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if (braced && *t == '}')
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break;
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if (!braced && t != s)
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break;
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t++;
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}
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if (s == t)
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yyerror("invalid unit");
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c->unit = stralloc_n(s, t-s);
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if (braced) {
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if (!*t)
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yyerror("unterminated unit");
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if (*t != '}')
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yyerror("invalid variable name");
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t++;
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}
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return t;
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@ -204,7 +216,6 @@ static struct chunk *parse_pattern(const char *s)
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end_chunk(&last, start, s);
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c = alloc_type(struct chunk);
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c->unit = NULL;
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c->next = NULL;
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*last = c;
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last = &c->next;
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@ -324,18 +335,13 @@ static void dump_chunks(FILE *file, const struct chunk *c)
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break;
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case ct_sub:
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if (c->u.sub)
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fprintf(file, "${%d", c->u.sub);
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fprintf(file, "$%d", c->u.sub);
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else
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fprintf(file, "${$");
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fprintf(file, "$$");
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break;
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default:
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abort();
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}
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if (c->type != ct_string) {
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if (c->unit)
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fprintf(file, "#%s", c->unit);
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fprintf(file, "}");
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}
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c = c->next;
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}
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}
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@ -31,7 +31,6 @@ struct chunk {
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const char *var;
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int sub; /* 0 if $$ */
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} u;
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const char *unit; /* NULL if no conversion specified */
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struct chunk *next;
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};
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@ -50,6 +49,7 @@ struct subst {
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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[10];
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} match;
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struct {
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const char *dst;
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@ -62,6 +62,9 @@ struct subst {
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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, const char *pat);
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struct subst *subst_end(void);
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