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grep.c
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#include "cache.h"
#include "config.h"
#include "grep.h"
#include "object-store.h"
#include "userdiff.h"
#include "xdiff-interface.h"
#include "diff.h"
#include "diffcore.h"
#include "commit.h"
#include "quote.h"
#include "help.h"
static int grep_source_load(struct grep_source *gs);
static int grep_source_is_binary(struct grep_source *gs,
struct index_state *istate);
static struct grep_opt grep_defaults;
#ifdef USE_LIBPCRE2
static pcre2_general_context *pcre2_global_context;
static void *pcre2_malloc(PCRE2_SIZE size, MAYBE_UNUSED void *memory_data)
{
return malloc(size);
}
static void pcre2_free(void *pointer, MAYBE_UNUSED void *memory_data)
{
free(pointer);
}
#endif
static const char *color_grep_slots[] = {
[GREP_COLOR_CONTEXT] = "context",
[GREP_COLOR_FILENAME] = "filename",
[GREP_COLOR_FUNCTION] = "function",
[GREP_COLOR_LINENO] = "lineNumber",
[GREP_COLOR_COLUMNNO] = "column",
[GREP_COLOR_MATCH_CONTEXT] = "matchContext",
[GREP_COLOR_MATCH_SELECTED] = "matchSelected",
[GREP_COLOR_SELECTED] = "selected",
[GREP_COLOR_SEP] = "separator",
};
static void std_output(struct grep_opt *opt, const void *buf, size_t size)
{
fwrite(buf, size, 1, stdout);
}
static void color_set(char *dst, const char *color_bytes)
{
xsnprintf(dst, COLOR_MAXLEN, "%s", color_bytes);
}
/*
* Initialize the grep_defaults template with hardcoded defaults.
* We could let the compiler do this, but without C99 initializers
* the code gets unwieldy and unreadable, so...
*/
void init_grep_defaults(struct repository *repo)
{
struct grep_opt *opt = &grep_defaults;
static int run_once;
if (run_once)
return;
run_once++;
memset(opt, 0, sizeof(*opt));
opt->repo = repo;
opt->relative = 1;
opt->pathname = 1;
opt->max_depth = -1;
opt->pattern_type_option = GREP_PATTERN_TYPE_UNSPECIFIED;
color_set(opt->colors[GREP_COLOR_CONTEXT], "");
color_set(opt->colors[GREP_COLOR_FILENAME], "");
color_set(opt->colors[GREP_COLOR_FUNCTION], "");
color_set(opt->colors[GREP_COLOR_LINENO], "");
color_set(opt->colors[GREP_COLOR_COLUMNNO], "");
color_set(opt->colors[GREP_COLOR_MATCH_CONTEXT], GIT_COLOR_BOLD_RED);
color_set(opt->colors[GREP_COLOR_MATCH_SELECTED], GIT_COLOR_BOLD_RED);
color_set(opt->colors[GREP_COLOR_SELECTED], "");
color_set(opt->colors[GREP_COLOR_SEP], GIT_COLOR_CYAN);
opt->only_matching = 0;
opt->color = -1;
opt->output = std_output;
}
static int parse_pattern_type_arg(const char *opt, const char *arg)
{
if (!strcmp(arg, "default"))
return GREP_PATTERN_TYPE_UNSPECIFIED;
else if (!strcmp(arg, "basic"))
return GREP_PATTERN_TYPE_BRE;
else if (!strcmp(arg, "extended"))
return GREP_PATTERN_TYPE_ERE;
else if (!strcmp(arg, "fixed"))
return GREP_PATTERN_TYPE_FIXED;
else if (!strcmp(arg, "perl"))
return GREP_PATTERN_TYPE_PCRE;
die("bad %s argument: %s", opt, arg);
}
define_list_config_array_extra(color_grep_slots, {"match"});
/*
* Read the configuration file once and store it in
* the grep_defaults template.
*/
int grep_config(const char *var, const char *value, void *cb)
{
struct grep_opt *opt = &grep_defaults;
const char *slot;
if (userdiff_config(var, value) < 0)
return -1;
if (!strcmp(var, "grep.extendedregexp")) {
opt->extended_regexp_option = git_config_bool(var, value);
return 0;
}
if (!strcmp(var, "grep.patterntype")) {
opt->pattern_type_option = parse_pattern_type_arg(var, value);
return 0;
}
if (!strcmp(var, "grep.linenumber")) {
opt->linenum = git_config_bool(var, value);
return 0;
}
if (!strcmp(var, "grep.column")) {
opt->columnnum = git_config_bool(var, value);
return 0;
}
if (!strcmp(var, "grep.fullname")) {
opt->relative = !git_config_bool(var, value);
return 0;
}
if (!strcmp(var, "color.grep"))
opt->color = git_config_colorbool(var, value);
if (!strcmp(var, "color.grep.match")) {
if (grep_config("color.grep.matchcontext", value, cb) < 0)
return -1;
if (grep_config("color.grep.matchselected", value, cb) < 0)
return -1;
} else if (skip_prefix(var, "color.grep.", &slot)) {
int i = LOOKUP_CONFIG(color_grep_slots, slot);
char *color;
if (i < 0)
return -1;
color = opt->colors[i];
if (!value)
return config_error_nonbool(var);
return color_parse(value, color);
}
return 0;
}
/*
* Initialize one instance of grep_opt and copy the
* default values from the template we read the configuration
* information in an earlier call to git_config(grep_config).
*
* If using PCRE, make sure that the library is configured
* to use the same allocator as Git (e.g. nedmalloc on Windows).
*
* Any allocated memory needs to be released in grep_destroy().
*/
void grep_init(struct grep_opt *opt, struct repository *repo, const char *prefix)
{
struct grep_opt *def = &grep_defaults;
int i;
#if defined(USE_LIBPCRE2)
if (!pcre2_global_context)
pcre2_global_context = pcre2_general_context_create(
pcre2_malloc, pcre2_free, NULL);
#endif
#ifdef USE_LIBPCRE1
pcre_malloc = malloc;
pcre_free = free;
#endif
memset(opt, 0, sizeof(*opt));
opt->repo = repo;
opt->prefix = prefix;
opt->prefix_length = (prefix && *prefix) ? strlen(prefix) : 0;
opt->pattern_tail = &opt->pattern_list;
opt->header_tail = &opt->header_list;
opt->only_matching = def->only_matching;
opt->color = def->color;
opt->extended_regexp_option = def->extended_regexp_option;
opt->pattern_type_option = def->pattern_type_option;
opt->linenum = def->linenum;
opt->columnnum = def->columnnum;
opt->max_depth = def->max_depth;
opt->pathname = def->pathname;
opt->relative = def->relative;
opt->output = def->output;
for (i = 0; i < NR_GREP_COLORS; i++)
color_set(opt->colors[i], def->colors[i]);
}
void grep_destroy(void)
{
#ifdef USE_LIBPCRE2
pcre2_general_context_free(pcre2_global_context);
#endif
}
static void grep_set_pattern_type_option(enum grep_pattern_type pattern_type, struct grep_opt *opt)
{
/*
* When committing to the pattern type by setting the relevant
* fields in grep_opt it's generally not necessary to zero out
* the fields we're not choosing, since they won't have been
* set by anything. The extended_regexp_option field is the
* only exception to this.
*
* This is because in the process of parsing grep.patternType
* & grep.extendedRegexp we set opt->pattern_type_option and
* opt->extended_regexp_option, respectively. We then
* internally use opt->extended_regexp_option to see if we're
* compiling an ERE. It must be unset if that's not actually
* the case.
*/
if (pattern_type != GREP_PATTERN_TYPE_ERE &&
opt->extended_regexp_option)
opt->extended_regexp_option = 0;
switch (pattern_type) {
case GREP_PATTERN_TYPE_UNSPECIFIED:
/* fall through */
case GREP_PATTERN_TYPE_BRE:
break;
case GREP_PATTERN_TYPE_ERE:
opt->extended_regexp_option = 1;
break;
case GREP_PATTERN_TYPE_FIXED:
opt->fixed = 1;
break;
case GREP_PATTERN_TYPE_PCRE:
#ifdef USE_LIBPCRE2
opt->pcre2 = 1;
#else
/*
* It's important that pcre1 always be assigned to
* even when there's no USE_LIBPCRE* defined. We still
* call the PCRE stub function, it just dies with
* "cannot use Perl-compatible regexes[...]".
*/
opt->pcre1 = 1;
#endif
break;
}
}
void grep_commit_pattern_type(enum grep_pattern_type pattern_type, struct grep_opt *opt)
{
if (pattern_type != GREP_PATTERN_TYPE_UNSPECIFIED)
grep_set_pattern_type_option(pattern_type, opt);
else if (opt->pattern_type_option != GREP_PATTERN_TYPE_UNSPECIFIED)
grep_set_pattern_type_option(opt->pattern_type_option, opt);
else if (opt->extended_regexp_option)
/*
* This branch *must* happen after setting from the
* opt->pattern_type_option above, we don't want
* grep.extendedRegexp to override grep.patternType!
*/
grep_set_pattern_type_option(GREP_PATTERN_TYPE_ERE, opt);
}
static struct grep_pat *create_grep_pat(const char *pat, size_t patlen,
const char *origin, int no,
enum grep_pat_token t,
enum grep_header_field field)
{
struct grep_pat *p = xcalloc(1, sizeof(*p));
p->pattern = xmemdupz(pat, patlen);
p->patternlen = patlen;
p->origin = origin;
p->no = no;
p->token = t;
p->field = field;
return p;
}
static void do_append_grep_pat(struct grep_pat ***tail, struct grep_pat *p)
{
**tail = p;
*tail = &p->next;
p->next = NULL;
switch (p->token) {
case GREP_PATTERN: /* atom */
case GREP_PATTERN_HEAD:
case GREP_PATTERN_BODY:
for (;;) {
struct grep_pat *new_pat;
size_t len = 0;
char *cp = p->pattern + p->patternlen, *nl = NULL;
while (++len <= p->patternlen) {
if (*(--cp) == '\n') {
nl = cp;
break;
}
}
if (!nl)
break;
new_pat = create_grep_pat(nl + 1, len - 1, p->origin,
p->no, p->token, p->field);
new_pat->next = p->next;
if (!p->next)
*tail = &new_pat->next;
p->next = new_pat;
*nl = '\0';
p->patternlen -= len;
}
break;
default:
break;
}
}
void append_header_grep_pattern(struct grep_opt *opt,
enum grep_header_field field, const char *pat)
{
struct grep_pat *p = create_grep_pat(pat, strlen(pat), "header", 0,
GREP_PATTERN_HEAD, field);
if (field == GREP_HEADER_REFLOG)
opt->use_reflog_filter = 1;
do_append_grep_pat(&opt->header_tail, p);
}
void append_grep_pattern(struct grep_opt *opt, const char *pat,
const char *origin, int no, enum grep_pat_token t)
{
append_grep_pat(opt, pat, strlen(pat), origin, no, t);
}
void append_grep_pat(struct grep_opt *opt, const char *pat, size_t patlen,
const char *origin, int no, enum grep_pat_token t)
{
struct grep_pat *p = create_grep_pat(pat, patlen, origin, no, t, 0);
do_append_grep_pat(&opt->pattern_tail, p);
}
struct grep_opt *grep_opt_dup(const struct grep_opt *opt)
{
struct grep_pat *pat;
struct grep_opt *ret = xmalloc(sizeof(struct grep_opt));
*ret = *opt;
ret->pattern_list = NULL;
ret->pattern_tail = &ret->pattern_list;
for(pat = opt->pattern_list; pat != NULL; pat = pat->next)
{
if(pat->token == GREP_PATTERN_HEAD)
append_header_grep_pattern(ret, pat->field,
pat->pattern);
else
append_grep_pat(ret, pat->pattern, pat->patternlen,
pat->origin, pat->no, pat->token);
}
return ret;
}
static NORETURN void compile_regexp_failed(const struct grep_pat *p,
const char *error)
{
char where[1024];
if (p->no)
xsnprintf(where, sizeof(where), "In '%s' at %d, ", p->origin, p->no);
else if (p->origin)
xsnprintf(where, sizeof(where), "%s, ", p->origin);
else
where[0] = 0;
die("%s'%s': %s", where, p->pattern, error);
}
static int is_fixed(const char *s, size_t len)
{
size_t i;
for (i = 0; i < len; i++) {
if (is_regex_special(s[i]))
return 0;
}
return 1;
}
#ifdef USE_LIBPCRE1
static void compile_pcre1_regexp(struct grep_pat *p, const struct grep_opt *opt)
{
const char *error;
int erroffset;
int options = PCRE_MULTILINE;
int study_options = 0;
if (opt->ignore_case) {
if (!opt->ignore_locale && has_non_ascii(p->pattern))
p->pcre1_tables = pcre_maketables();
options |= PCRE_CASELESS;
}
if (!opt->ignore_locale && is_utf8_locale() && has_non_ascii(p->pattern))
options |= PCRE_UTF8;
p->pcre1_regexp = pcre_compile(p->pattern, options, &error, &erroffset,
p->pcre1_tables);
if (!p->pcre1_regexp)
compile_regexp_failed(p, error);
#if defined(PCRE_CONFIG_JIT) && !defined(NO_LIBPCRE1_JIT)
pcre_config(PCRE_CONFIG_JIT, &p->pcre1_jit_on);
if (opt->debug)
fprintf(stderr, "pcre1_jit_on=%d\n", p->pcre1_jit_on);
if (p->pcre1_jit_on)
study_options = PCRE_STUDY_JIT_COMPILE;
#endif
p->pcre1_extra_info = pcre_study(p->pcre1_regexp, study_options, &error);
if (!p->pcre1_extra_info && error)
die("%s", error);
}
static int pcre1match(struct grep_pat *p, const char *line, const char *eol,
regmatch_t *match, int eflags)
{
int ovector[30], ret, flags = PCRE_NO_UTF8_CHECK;
if (eflags & REG_NOTBOL)
flags |= PCRE_NOTBOL;
ret = pcre_exec(p->pcre1_regexp, p->pcre1_extra_info, line,
eol - line, 0, flags, ovector,
ARRAY_SIZE(ovector));
if (ret < 0 && ret != PCRE_ERROR_NOMATCH)
die("pcre_exec failed with error code %d", ret);
if (ret > 0) {
ret = 0;
match->rm_so = ovector[0];
match->rm_eo = ovector[1];
}
return ret;
}
static void free_pcre1_regexp(struct grep_pat *p)
{
pcre_free(p->pcre1_regexp);
#ifdef PCRE_CONFIG_JIT
if (p->pcre1_jit_on)
pcre_free_study(p->pcre1_extra_info);
else
#endif
pcre_free(p->pcre1_extra_info);
pcre_free((void *)p->pcre1_tables);
}
#else /* !USE_LIBPCRE1 */
static void compile_pcre1_regexp(struct grep_pat *p, const struct grep_opt *opt)
{
die("cannot use Perl-compatible regexes when not compiled with USE_LIBPCRE");
}
static int pcre1match(struct grep_pat *p, const char *line, const char *eol,
regmatch_t *match, int eflags)
{
return 1;
}
static void free_pcre1_regexp(struct grep_pat *p)
{
}
#endif /* !USE_LIBPCRE1 */
#ifdef USE_LIBPCRE2
static void compile_pcre2_pattern(struct grep_pat *p, const struct grep_opt *opt)
{
int error;
PCRE2_UCHAR errbuf[256];
PCRE2_SIZE erroffset;
int options = PCRE2_MULTILINE;
int jitret;
int patinforet;
size_t jitsizearg;
assert(opt->pcre2);
p->pcre2_compile_context = NULL;
/* pcre2_global_context is initialized in append_grep_pattern */
if (opt->ignore_case) {
if (!opt->ignore_locale && has_non_ascii(p->pattern)) {
if (!pcre2_global_context)
BUG("pcre2_global_context uninitialized");
p->pcre2_tables = pcre2_maketables(pcre2_global_context);
p->pcre2_compile_context = pcre2_compile_context_create(NULL);
pcre2_set_character_tables(p->pcre2_compile_context,
p->pcre2_tables);
}
options |= PCRE2_CASELESS;
}
if (!opt->ignore_locale && is_utf8_locale() && has_non_ascii(p->pattern) &&
!(!opt->ignore_case && (p->fixed || p->is_fixed)))
options |= PCRE2_UTF;
p->pcre2_pattern = pcre2_compile((PCRE2_SPTR)p->pattern,
p->patternlen, options, &error, &erroffset,
p->pcre2_compile_context);
if (p->pcre2_pattern) {
p->pcre2_match_data = pcre2_match_data_create_from_pattern(p->pcre2_pattern, NULL);
if (!p->pcre2_match_data)
die("Couldn't allocate PCRE2 match data");
} else {
pcre2_get_error_message(error, errbuf, sizeof(errbuf));
compile_regexp_failed(p, (const char *)&errbuf);
}
pcre2_config(PCRE2_CONFIG_JIT, &p->pcre2_jit_on);
if (opt->debug)
fprintf(stderr, "pcre2_jit_on=%d\n", p->pcre2_jit_on);
if (p->pcre2_jit_on) {
jitret = pcre2_jit_compile(p->pcre2_pattern, PCRE2_JIT_COMPLETE);
if (jitret)
die("Couldn't JIT the PCRE2 pattern '%s', got '%d'\n", p->pattern, jitret);
/*
* The pcre2_config(PCRE2_CONFIG_JIT, ...) call just
* tells us whether the library itself supports JIT,
* but to see whether we're going to be actually using
* JIT we need to extract PCRE2_INFO_JITSIZE from the
* pattern *after* we do pcre2_jit_compile() above.
*
* This is because if the pattern contains the
* (*NO_JIT) verb (see pcre2syntax(3))
* pcre2_jit_compile() will exit early with 0. If we
* then proceed to call pcre2_jit_match() further down
* the line instead of pcre2_match() we'll either
* segfault (pre PCRE 10.31) or run into a fatal error
* (post PCRE2 10.31)
*/
patinforet = pcre2_pattern_info(p->pcre2_pattern, PCRE2_INFO_JITSIZE, &jitsizearg);
if (patinforet)
BUG("pcre2_pattern_info() failed: %d", patinforet);
if (jitsizearg == 0) {
p->pcre2_jit_on = 0;
if (opt->debug)
fprintf(stderr, "pcre2_jit_on=%d: (*NO_JIT) in regex\n",
p->pcre2_jit_on);
return;
}
}
}
static int pcre2match(struct grep_pat *p, const char *line, const char *eol,
regmatch_t *match, int eflags)
{
int ret, flags = 0;
PCRE2_SIZE *ovector;
PCRE2_UCHAR errbuf[256];
if (eflags & REG_NOTBOL)
flags |= PCRE2_NOTBOL;
if (p->pcre2_jit_on)
ret = pcre2_jit_match(p->pcre2_pattern, (unsigned char *)line,
eol - line, 0, flags, p->pcre2_match_data,
NULL);
else
ret = pcre2_match(p->pcre2_pattern, (unsigned char *)line,
eol - line, 0, flags, p->pcre2_match_data,
NULL);
if (ret < 0 && ret != PCRE2_ERROR_NOMATCH) {
pcre2_get_error_message(ret, errbuf, sizeof(errbuf));
die("%s failed with error code %d: %s",
(p->pcre2_jit_on ? "pcre2_jit_match" : "pcre2_match"), ret,
errbuf);
}
if (ret > 0) {
ovector = pcre2_get_ovector_pointer(p->pcre2_match_data);
ret = 0;
match->rm_so = (int)ovector[0];
match->rm_eo = (int)ovector[1];
}
return ret;
}
static void free_pcre2_pattern(struct grep_pat *p)
{
pcre2_compile_context_free(p->pcre2_compile_context);
pcre2_code_free(p->pcre2_pattern);
pcre2_match_data_free(p->pcre2_match_data);
free((void *)p->pcre2_tables);
}
#else /* !USE_LIBPCRE2 */
static void compile_pcre2_pattern(struct grep_pat *p, const struct grep_opt *opt)
{
/*
* Unreachable until USE_LIBPCRE2 becomes synonymous with
* USE_LIBPCRE. See the sibling comment in
* grep_set_pattern_type_option().
*/
die("cannot use Perl-compatible regexes when not compiled with USE_LIBPCRE");
}
static int pcre2match(struct grep_pat *p, const char *line, const char *eol,
regmatch_t *match, int eflags)
{
return 1;
}
static void free_pcre2_pattern(struct grep_pat *p)
{
}
static void compile_fixed_regexp(struct grep_pat *p, struct grep_opt *opt)
{
struct strbuf sb = STRBUF_INIT;
int err;
int regflags = 0;
basic_regex_quote_buf(&sb, p->pattern);
if (opt->ignore_case)
regflags |= REG_ICASE;
err = regcomp(&p->regexp, sb.buf, regflags);
if (opt->debug)
fprintf(stderr, "fixed %s\n", sb.buf);
strbuf_release(&sb);
if (err) {
char errbuf[1024];
regerror(err, &p->regexp, errbuf, sizeof(errbuf));
compile_regexp_failed(p, errbuf);
}
}
#endif /* !USE_LIBPCRE2 */
static void compile_regexp(struct grep_pat *p, struct grep_opt *opt)
{
int err;
int regflags = REG_NEWLINE;
p->word_regexp = opt->word_regexp;
p->ignore_case = opt->ignore_case;
p->fixed = opt->fixed;
if (memchr(p->pattern, 0, p->patternlen) && !opt->pcre2)
die(_("given pattern contains NULL byte (via -f <file>). This is only supported with -P under PCRE v2"));
p->is_fixed = is_fixed(p->pattern, p->patternlen);
#ifdef USE_LIBPCRE2
if (!p->fixed && !p->is_fixed) {
const char *no_jit = "(*NO_JIT)";
const int no_jit_len = strlen(no_jit);
if (starts_with(p->pattern, no_jit) &&
is_fixed(p->pattern + no_jit_len,
p->patternlen - no_jit_len))
p->is_fixed = 1;
}
#endif
if (p->fixed || p->is_fixed) {
#ifdef USE_LIBPCRE2
opt->pcre2 = 1;
if (p->is_fixed) {
compile_pcre2_pattern(p, opt);
} else {
/*
* E.g. t7811-grep-open.sh relies on the
* pattern being restored.
*/
char *old_pattern = p->pattern;
size_t old_patternlen = p->patternlen;
struct strbuf sb = STRBUF_INIT;
/*
* There is the PCRE2_LITERAL flag, but it's
* only in PCRE v2 10.30 and later. Needing to
* ifdef our way around that and dealing with
* it + PCRE2_MULTILINE being an error is more
* complex than just quoting this ourselves.
*/
strbuf_add(&sb, "\\Q", 2);
strbuf_add(&sb, p->pattern, p->patternlen);
strbuf_add(&sb, "\\E", 2);
p->pattern = sb.buf;
p->patternlen = sb.len;
compile_pcre2_pattern(p, opt);
p->pattern = old_pattern;
p->patternlen = old_patternlen;
strbuf_release(&sb);
}
#else /* !USE_LIBPCRE2 */
compile_fixed_regexp(p, opt);
#endif /* !USE_LIBPCRE2 */
return;
}
if (opt->pcre2) {
compile_pcre2_pattern(p, opt);
return;
}
if (opt->pcre1) {
compile_pcre1_regexp(p, opt);
return;
}
if (p->ignore_case)
regflags |= REG_ICASE;
if (opt->extended_regexp_option)
regflags |= REG_EXTENDED;
err = regcomp(&p->regexp, p->pattern, regflags);
if (err) {
char errbuf[1024];
regerror(err, &p->regexp, errbuf, 1024);
compile_regexp_failed(p, errbuf);
}
}
static struct grep_expr *compile_pattern_or(struct grep_pat **);
static struct grep_expr *compile_pattern_atom(struct grep_pat **list)
{
struct grep_pat *p;
struct grep_expr *x;
p = *list;
if (!p)
return NULL;
switch (p->token) {
case GREP_PATTERN: /* atom */
case GREP_PATTERN_HEAD:
case GREP_PATTERN_BODY:
x = xcalloc(1, sizeof (struct grep_expr));
x->node = GREP_NODE_ATOM;
x->u.atom = p;
*list = p->next;
return x;
case GREP_OPEN_PAREN:
*list = p->next;
x = compile_pattern_or(list);
if (!*list || (*list)->token != GREP_CLOSE_PAREN)
die("unmatched parenthesis");
*list = (*list)->next;
return x;
default:
return NULL;
}
}
static struct grep_expr *compile_pattern_not(struct grep_pat **list)
{
struct grep_pat *p;
struct grep_expr *x;
p = *list;
if (!p)
return NULL;
switch (p->token) {
case GREP_NOT:
if (!p->next)
die("--not not followed by pattern expression");
*list = p->next;
x = xcalloc(1, sizeof (struct grep_expr));
x->node = GREP_NODE_NOT;
x->u.unary = compile_pattern_not(list);
if (!x->u.unary)
die("--not followed by non pattern expression");
return x;
default:
return compile_pattern_atom(list);
}
}
static struct grep_expr *compile_pattern_and(struct grep_pat **list)
{
struct grep_pat *p;
struct grep_expr *x, *y, *z;
x = compile_pattern_not(list);
p = *list;
if (p && p->token == GREP_AND) {
if (!p->next)
die("--and not followed by pattern expression");
*list = p->next;
y = compile_pattern_and(list);
if (!y)
die("--and not followed by pattern expression");
z = xcalloc(1, sizeof (struct grep_expr));
z->node = GREP_NODE_AND;
z->u.binary.left = x;
z->u.binary.right = y;
return z;
}
return x;
}
static struct grep_expr *compile_pattern_or(struct grep_pat **list)
{
struct grep_pat *p;
struct grep_expr *x, *y, *z;
x = compile_pattern_and(list);
p = *list;
if (x && p && p->token != GREP_CLOSE_PAREN) {
y = compile_pattern_or(list);
if (!y)
die("not a pattern expression %s", p->pattern);
z = xcalloc(1, sizeof (struct grep_expr));
z->node = GREP_NODE_OR;
z->u.binary.left = x;
z->u.binary.right = y;
return z;
}
return x;
}
static struct grep_expr *compile_pattern_expr(struct grep_pat **list)
{
return compile_pattern_or(list);
}
static void indent(int in)
{
while (in-- > 0)
fputc(' ', stderr);
}
static void dump_grep_pat(struct grep_pat *p)
{
switch (p->token) {
case GREP_AND: fprintf(stderr, "*and*"); break;
case GREP_OPEN_PAREN: fprintf(stderr, "*(*"); break;
case GREP_CLOSE_PAREN: fprintf(stderr, "*)*"); break;
case GREP_NOT: fprintf(stderr, "*not*"); break;
case GREP_OR: fprintf(stderr, "*or*"); break;
case GREP_PATTERN: fprintf(stderr, "pattern"); break;
case GREP_PATTERN_HEAD: fprintf(stderr, "pattern_head"); break;
case GREP_PATTERN_BODY: fprintf(stderr, "pattern_body"); break;
}
switch (p->token) {
default: break;
case GREP_PATTERN_HEAD:
fprintf(stderr, "<head %d>", p->field); break;
case GREP_PATTERN_BODY:
fprintf(stderr, "<body>"); break;
}
switch (p->token) {
default: break;
case GREP_PATTERN_HEAD:
case GREP_PATTERN_BODY:
case GREP_PATTERN:
fprintf(stderr, "%.*s", (int)p->patternlen, p->pattern);
break;
}
fputc('\n', stderr);
}
static void dump_grep_expression_1(struct grep_expr *x, int in)
{
indent(in);
switch (x->node) {
case GREP_NODE_TRUE:
fprintf(stderr, "true\n");
break;
case GREP_NODE_ATOM:
dump_grep_pat(x->u.atom);
break;
case GREP_NODE_NOT:
fprintf(stderr, "(not\n");
dump_grep_expression_1(x->u.unary, in+1);
indent(in);
fprintf(stderr, ")\n");
break;
case GREP_NODE_AND:
fprintf(stderr, "(and\n");
dump_grep_expression_1(x->u.binary.left, in+1);
dump_grep_expression_1(x->u.binary.right, in+1);
indent(in);
fprintf(stderr, ")\n");
break;
case GREP_NODE_OR:
fprintf(stderr, "(or\n");
dump_grep_expression_1(x->u.binary.left, in+1);
dump_grep_expression_1(x->u.binary.right, in+1);
indent(in);
fprintf(stderr, ")\n");
break;
}
}
static void dump_grep_expression(struct grep_opt *opt)
{
struct grep_expr *x = opt->pattern_expression;
if (opt->all_match)
fprintf(stderr, "[all-match]\n");
dump_grep_expression_1(x, 0);
fflush(NULL);
}
static struct grep_expr *grep_true_expr(void)
{
struct grep_expr *z = xcalloc(1, sizeof(*z));
z->node = GREP_NODE_TRUE;
return z;
}
static struct grep_expr *grep_or_expr(struct grep_expr *left, struct grep_expr *right)
{
struct grep_expr *z = xcalloc(1, sizeof(*z));
z->node = GREP_NODE_OR;
z->u.binary.left = left;
z->u.binary.right = right;
return z;
}
static struct grep_expr *prep_header_patterns(struct grep_opt *opt)
{
struct grep_pat *p;
struct grep_expr *header_expr;
struct grep_expr *(header_group[GREP_HEADER_FIELD_MAX]);
enum grep_header_field fld;
if (!opt->header_list)
return NULL;
for (p = opt->header_list; p; p = p->next) {
if (p->token != GREP_PATTERN_HEAD)
BUG("a non-header pattern in grep header list.");
if (p->field < GREP_HEADER_FIELD_MIN ||
GREP_HEADER_FIELD_MAX <= p->field)
BUG("unknown header field %d", p->field);
compile_regexp(p, opt);
}
for (fld = 0; fld < GREP_HEADER_FIELD_MAX; fld++)
header_group[fld] = NULL;
for (p = opt->header_list; p; p = p->next) {
struct grep_expr *h;
struct grep_pat *pp = p;
h = compile_pattern_atom(&pp);
if (!h || pp != p->next)
BUG("malformed header expr");
if (!header_group[p->field]) {
header_group[p->field] = h;
continue;
}
header_group[p->field] = grep_or_expr(h, header_group[p->field]);
}
header_expr = NULL;
for (fld = 0; fld < GREP_HEADER_FIELD_MAX; fld++) {
if (!header_group[fld])
continue;
if (!header_expr)
header_expr = grep_true_expr();
header_expr = grep_or_expr(header_group[fld], header_expr);
}
return header_expr;
}
static struct grep_expr *grep_splice_or(struct grep_expr *x, struct grep_expr *y)
{
struct grep_expr *z = x;
while (x) {
assert(x->node == GREP_NODE_OR);
if (x->u.binary.right &&
x->u.binary.right->node == GREP_NODE_TRUE) {
x->u.binary.right = y;
break;
}
x = x->u.binary.right;
}