builtin-grep: make pieces of it available as library.
This makes three functions and associated option structures from builtin-grep available from other parts of the system. * options to drive built-in grep engine is stored in struct grep_opt; * pattern strings and extended grep expressions are added to struct grep_opt with append_grep_pattern(); * when finished calling append_grep_pattern(), call compile_grep_patterns() to prepare for execution; * call grep_buffer() to find matches in the in-core buffer. This also adds an internal option "status_only" to grep_opt, which suppresses any output from grep_buffer(). Callers of the function as library can use it to check if there is a match without producing any output. Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Junio C Hamano
parent
62e27f273d
commit
83b5d2f5b0
4
Makefile
4
Makefile
@ -234,7 +234,7 @@ LIB_FILE=libgit.a
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XDIFF_LIB=xdiff/lib.a
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XDIFF_LIB=xdiff/lib.a
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LIB_H = \
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LIB_H = \
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archive.h blob.h cache.h commit.h csum-file.h delta.h \
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archive.h blob.h cache.h commit.h csum-file.h delta.h grep.h \
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diff.h object.h pack.h pkt-line.h quote.h refs.h list-objects.h sideband.h \
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diff.h object.h pack.h pkt-line.h quote.h refs.h list-objects.h sideband.h \
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run-command.h strbuf.h tag.h tree.h git-compat-util.h revision.h \
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run-command.h strbuf.h tag.h tree.h git-compat-util.h revision.h \
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tree-walk.h log-tree.h dir.h path-list.h unpack-trees.h builtin.h
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tree-walk.h log-tree.h dir.h path-list.h unpack-trees.h builtin.h
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@ -252,7 +252,7 @@ LIB_OBJS = \
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server-info.o setup.o sha1_file.o sha1_name.o strbuf.o \
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server-info.o setup.o sha1_file.o sha1_name.o strbuf.o \
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tag.o tree.o usage.o config.o environment.o ctype.o copy.o \
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tag.o tree.o usage.o config.o environment.o ctype.o copy.o \
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fetch-clone.o revision.o pager.o tree-walk.o xdiff-interface.o \
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fetch-clone.o revision.o pager.o tree-walk.o xdiff-interface.o \
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write_or_die.o trace.o list-objects.o \
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write_or_die.o trace.o list-objects.o grep.o \
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alloc.o merge-file.o path-list.o help.o unpack-trees.o $(DIFF_OBJS) \
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alloc.o merge-file.o path-list.o help.o unpack-trees.o $(DIFF_OBJS) \
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color.o wt-status.o
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color.o wt-status.o
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516
builtin-grep.c
516
builtin-grep.c
@ -11,6 +11,7 @@
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#include "tree-walk.h"
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#include "tree-walk.h"
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#include "builtin.h"
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#include "builtin.h"
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#include <regex.h>
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#include <regex.h>
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#include "grep.h"
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#include <fnmatch.h>
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#include <fnmatch.h>
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#include <sys/wait.h>
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#include <sys/wait.h>
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@ -82,498 +83,6 @@ static int pathspec_matches(const char **paths, const char *name)
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return 0;
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return 0;
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}
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}
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enum grep_pat_token {
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GREP_PATTERN,
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GREP_AND,
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GREP_OPEN_PAREN,
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GREP_CLOSE_PAREN,
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GREP_NOT,
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GREP_OR,
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};
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struct grep_pat {
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struct grep_pat *next;
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const char *origin;
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int no;
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enum grep_pat_token token;
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const char *pattern;
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regex_t regexp;
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};
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enum grep_expr_node {
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GREP_NODE_ATOM,
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GREP_NODE_NOT,
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GREP_NODE_AND,
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GREP_NODE_OR,
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};
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struct grep_expr {
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enum grep_expr_node node;
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union {
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struct grep_pat *atom;
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struct grep_expr *unary;
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struct {
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struct grep_expr *left;
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struct grep_expr *right;
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} binary;
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} u;
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};
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struct grep_opt {
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struct grep_pat *pattern_list;
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struct grep_pat **pattern_tail;
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struct grep_expr *pattern_expression;
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int prefix_length;
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regex_t regexp;
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unsigned linenum:1;
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unsigned invert:1;
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unsigned name_only:1;
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unsigned unmatch_name_only:1;
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unsigned count:1;
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unsigned word_regexp:1;
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unsigned fixed:1;
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#define GREP_BINARY_DEFAULT 0
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#define GREP_BINARY_NOMATCH 1
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#define GREP_BINARY_TEXT 2
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unsigned binary:2;
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unsigned extended:1;
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unsigned relative:1;
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unsigned pathname:1;
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int regflags;
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unsigned pre_context;
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unsigned post_context;
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};
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static void add_pattern(struct grep_opt *opt, const char *pat,
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const char *origin, int no, enum grep_pat_token t)
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{
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struct grep_pat *p = xcalloc(1, sizeof(*p));
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p->pattern = pat;
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p->origin = origin;
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p->no = no;
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p->token = t;
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*opt->pattern_tail = p;
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opt->pattern_tail = &p->next;
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p->next = NULL;
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}
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static void compile_regexp(struct grep_pat *p, struct grep_opt *opt)
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{
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int err = regcomp(&p->regexp, p->pattern, opt->regflags);
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if (err) {
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char errbuf[1024];
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char where[1024];
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if (p->no)
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sprintf(where, "In '%s' at %d, ",
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p->origin, p->no);
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else if (p->origin)
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sprintf(where, "%s, ", p->origin);
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else
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where[0] = 0;
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regerror(err, &p->regexp, errbuf, 1024);
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regfree(&p->regexp);
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die("%s'%s': %s", where, p->pattern, errbuf);
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}
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}
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static struct grep_expr *compile_pattern_expr(struct grep_pat **);
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static struct grep_expr *compile_pattern_atom(struct grep_pat **list)
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{
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struct grep_pat *p;
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struct grep_expr *x;
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p = *list;
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switch (p->token) {
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case GREP_PATTERN: /* atom */
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x = xcalloc(1, sizeof (struct grep_expr));
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x->node = GREP_NODE_ATOM;
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x->u.atom = p;
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*list = p->next;
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return x;
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case GREP_OPEN_PAREN:
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*list = p->next;
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x = compile_pattern_expr(list);
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if (!x)
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return NULL;
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if (!*list || (*list)->token != GREP_CLOSE_PAREN)
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die("unmatched parenthesis");
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*list = (*list)->next;
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return x;
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default:
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return NULL;
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}
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}
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static struct grep_expr *compile_pattern_not(struct grep_pat **list)
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{
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struct grep_pat *p;
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struct grep_expr *x;
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p = *list;
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switch (p->token) {
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case GREP_NOT:
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if (!p->next)
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die("--not not followed by pattern expression");
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*list = p->next;
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x = xcalloc(1, sizeof (struct grep_expr));
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x->node = GREP_NODE_NOT;
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x->u.unary = compile_pattern_not(list);
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if (!x->u.unary)
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die("--not followed by non pattern expression");
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return x;
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default:
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return compile_pattern_atom(list);
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}
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}
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static struct grep_expr *compile_pattern_and(struct grep_pat **list)
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{
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struct grep_pat *p;
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struct grep_expr *x, *y, *z;
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x = compile_pattern_not(list);
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p = *list;
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if (p && p->token == GREP_AND) {
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if (!p->next)
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die("--and not followed by pattern expression");
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*list = p->next;
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y = compile_pattern_and(list);
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if (!y)
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die("--and not followed by pattern expression");
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z = xcalloc(1, sizeof (struct grep_expr));
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z->node = GREP_NODE_AND;
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z->u.binary.left = x;
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z->u.binary.right = y;
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return z;
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}
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return x;
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}
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static struct grep_expr *compile_pattern_or(struct grep_pat **list)
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{
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struct grep_pat *p;
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struct grep_expr *x, *y, *z;
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x = compile_pattern_and(list);
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p = *list;
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if (x && p && p->token != GREP_CLOSE_PAREN) {
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y = compile_pattern_or(list);
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if (!y)
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die("not a pattern expression %s", p->pattern);
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z = xcalloc(1, sizeof (struct grep_expr));
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z->node = GREP_NODE_OR;
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z->u.binary.left = x;
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z->u.binary.right = y;
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return z;
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}
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return x;
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}
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static struct grep_expr *compile_pattern_expr(struct grep_pat **list)
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{
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return compile_pattern_or(list);
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}
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static void compile_patterns(struct grep_opt *opt)
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{
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struct grep_pat *p;
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/* First compile regexps */
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for (p = opt->pattern_list; p; p = p->next) {
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if (p->token == GREP_PATTERN)
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compile_regexp(p, opt);
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else
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opt->extended = 1;
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}
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if (!opt->extended)
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return;
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/* Then bundle them up in an expression.
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* A classic recursive descent parser would do.
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*/
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p = opt->pattern_list;
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opt->pattern_expression = compile_pattern_expr(&p);
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if (p)
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die("incomplete pattern expression: %s", p->pattern);
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}
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static char *end_of_line(char *cp, unsigned long *left)
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{
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unsigned long l = *left;
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while (l && *cp != '\n') {
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l--;
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cp++;
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}
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*left = l;
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return cp;
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}
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static int word_char(char ch)
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{
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return isalnum(ch) || ch == '_';
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}
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static void show_line(struct grep_opt *opt, const char *bol, const char *eol,
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const char *name, unsigned lno, char sign)
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{
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if (opt->pathname)
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printf("%s%c", name, sign);
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if (opt->linenum)
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printf("%d%c", lno, sign);
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printf("%.*s\n", (int)(eol-bol), bol);
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}
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/*
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* NEEDSWORK: share code with diff.c
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*/
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#define FIRST_FEW_BYTES 8000
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static int buffer_is_binary(const char *ptr, unsigned long size)
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{
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if (FIRST_FEW_BYTES < size)
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size = FIRST_FEW_BYTES;
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return !!memchr(ptr, 0, size);
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}
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static int fixmatch(const char *pattern, char *line, regmatch_t *match)
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{
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char *hit = strstr(line, pattern);
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if (!hit) {
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match->rm_so = match->rm_eo = -1;
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return REG_NOMATCH;
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}
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else {
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match->rm_so = hit - line;
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match->rm_eo = match->rm_so + strlen(pattern);
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return 0;
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}
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}
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static int match_one_pattern(struct grep_opt *opt, struct grep_pat *p, char *bol, char *eol)
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{
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int hit = 0;
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int at_true_bol = 1;
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regmatch_t pmatch[10];
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again:
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if (!opt->fixed) {
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regex_t *exp = &p->regexp;
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hit = !regexec(exp, bol, ARRAY_SIZE(pmatch),
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pmatch, 0);
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}
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else {
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hit = !fixmatch(p->pattern, bol, pmatch);
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}
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if (hit && opt->word_regexp) {
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if ((pmatch[0].rm_so < 0) ||
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(eol - bol) <= pmatch[0].rm_so ||
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(pmatch[0].rm_eo < 0) ||
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(eol - bol) < pmatch[0].rm_eo)
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die("regexp returned nonsense");
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/* Match beginning must be either beginning of the
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* line, or at word boundary (i.e. the last char must
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* not be a word char). Similarly, match end must be
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* either end of the line, or at word boundary
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* (i.e. the next char must not be a word char).
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*/
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if ( ((pmatch[0].rm_so == 0 && at_true_bol) ||
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!word_char(bol[pmatch[0].rm_so-1])) &&
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((pmatch[0].rm_eo == (eol-bol)) ||
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!word_char(bol[pmatch[0].rm_eo])) )
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;
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else
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hit = 0;
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if (!hit && pmatch[0].rm_so + bol + 1 < eol) {
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/* There could be more than one match on the
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* line, and the first match might not be
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* strict word match. But later ones could be!
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*/
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bol = pmatch[0].rm_so + bol + 1;
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at_true_bol = 0;
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goto again;
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}
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}
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return hit;
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}
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static int match_expr_eval(struct grep_opt *opt,
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struct grep_expr *x,
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char *bol, char *eol)
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{
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switch (x->node) {
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case GREP_NODE_ATOM:
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return match_one_pattern(opt, x->u.atom, bol, eol);
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break;
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case GREP_NODE_NOT:
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return !match_expr_eval(opt, x->u.unary, bol, eol);
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case GREP_NODE_AND:
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return (match_expr_eval(opt, x->u.binary.left, bol, eol) &&
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match_expr_eval(opt, x->u.binary.right, bol, eol));
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case GREP_NODE_OR:
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return (match_expr_eval(opt, x->u.binary.left, bol, eol) ||
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match_expr_eval(opt, x->u.binary.right, bol, eol));
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}
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die("Unexpected node type (internal error) %d\n", x->node);
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}
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static int match_expr(struct grep_opt *opt, char *bol, char *eol)
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{
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struct grep_expr *x = opt->pattern_expression;
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return match_expr_eval(opt, x, bol, eol);
|
|
||||||
}
|
|
||||||
|
|
||||||
static int match_line(struct grep_opt *opt, char *bol, char *eol)
|
|
||||||
{
|
|
||||||
struct grep_pat *p;
|
|
||||||
if (opt->extended)
|
|
||||||
return match_expr(opt, bol, eol);
|
|
||||||
for (p = opt->pattern_list; p; p = p->next) {
|
|
||||||
if (match_one_pattern(opt, p, bol, eol))
|
|
||||||
return 1;
|
|
||||||
}
|
|
||||||
return 0;
|
|
||||||
}
|
|
||||||
|
|
||||||
static int grep_buffer(struct grep_opt *opt, const char *name,
|
|
||||||
char *buf, unsigned long size)
|
|
||||||
{
|
|
||||||
char *bol = buf;
|
|
||||||
unsigned long left = size;
|
|
||||||
unsigned lno = 1;
|
|
||||||
struct pre_context_line {
|
|
||||||
char *bol;
|
|
||||||
char *eol;
|
|
||||||
} *prev = NULL, *pcl;
|
|
||||||
unsigned last_hit = 0;
|
|
||||||
unsigned last_shown = 0;
|
|
||||||
int binary_match_only = 0;
|
|
||||||
const char *hunk_mark = "";
|
|
||||||
unsigned count = 0;
|
|
||||||
|
|
||||||
if (buffer_is_binary(buf, size)) {
|
|
||||||
switch (opt->binary) {
|
|
||||||
case GREP_BINARY_DEFAULT:
|
|
||||||
binary_match_only = 1;
|
|
||||||
break;
|
|
||||||
case GREP_BINARY_NOMATCH:
|
|
||||||
return 0; /* Assume unmatch */
|
|
||||||
break;
|
|
||||||
default:
|
|
||||||
break;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
if (opt->pre_context)
|
|
||||||
prev = xcalloc(opt->pre_context, sizeof(*prev));
|
|
||||||
if (opt->pre_context || opt->post_context)
|
|
||||||
hunk_mark = "--\n";
|
|
||||||
|
|
||||||
while (left) {
|
|
||||||
char *eol, ch;
|
|
||||||
int hit = 0;
|
|
||||||
|
|
||||||
eol = end_of_line(bol, &left);
|
|
||||||
ch = *eol;
|
|
||||||
*eol = 0;
|
|
||||||
|
|
||||||
hit = match_line(opt, bol, eol);
|
|
||||||
|
|
||||||
/* "grep -v -e foo -e bla" should list lines
|
|
||||||
* that do not have either, so inversion should
|
|
||||||
* be done outside.
|
|
||||||
*/
|
|
||||||
if (opt->invert)
|
|
||||||
hit = !hit;
|
|
||||||
if (opt->unmatch_name_only) {
|
|
||||||
if (hit)
|
|
||||||
return 0;
|
|
||||||
goto next_line;
|
|
||||||
}
|
|
||||||
if (hit) {
|
|
||||||
count++;
|
|
||||||
if (binary_match_only) {
|
|
||||||
printf("Binary file %s matches\n", name);
|
|
||||||
return 1;
|
|
||||||
}
|
|
||||||
if (opt->name_only) {
|
|
||||||
printf("%s\n", name);
|
|
||||||
return 1;
|
|
||||||
}
|
|
||||||
/* Hit at this line. If we haven't shown the
|
|
||||||
* pre-context lines, we would need to show them.
|
|
||||||
* When asked to do "count", this still show
|
|
||||||
* the context which is nonsense, but the user
|
|
||||||
* deserves to get that ;-).
|
|
||||||
*/
|
|
||||||
if (opt->pre_context) {
|
|
||||||
unsigned from;
|
|
||||||
if (opt->pre_context < lno)
|
|
||||||
from = lno - opt->pre_context;
|
|
||||||
else
|
|
||||||
from = 1;
|
|
||||||
if (from <= last_shown)
|
|
||||||
from = last_shown + 1;
|
|
||||||
if (last_shown && from != last_shown + 1)
|
|
||||||
printf(hunk_mark);
|
|
||||||
while (from < lno) {
|
|
||||||
pcl = &prev[lno-from-1];
|
|
||||||
show_line(opt, pcl->bol, pcl->eol,
|
|
||||||
name, from, '-');
|
|
||||||
from++;
|
|
||||||
}
|
|
||||||
last_shown = lno-1;
|
|
||||||
}
|
|
||||||
if (last_shown && lno != last_shown + 1)
|
|
||||||
printf(hunk_mark);
|
|
||||||
if (!opt->count)
|
|
||||||
show_line(opt, bol, eol, name, lno, ':');
|
|
||||||
last_shown = last_hit = lno;
|
|
||||||
}
|
|
||||||
else if (last_hit &&
|
|
||||||
lno <= last_hit + opt->post_context) {
|
|
||||||
/* If the last hit is within the post context,
|
|
||||||
* we need to show this line.
|
|
||||||
*/
|
|
||||||
if (last_shown && lno != last_shown + 1)
|
|
||||||
printf(hunk_mark);
|
|
||||||
show_line(opt, bol, eol, name, lno, '-');
|
|
||||||
last_shown = lno;
|
|
||||||
}
|
|
||||||
if (opt->pre_context) {
|
|
||||||
memmove(prev+1, prev,
|
|
||||||
(opt->pre_context-1) * sizeof(*prev));
|
|
||||||
prev->bol = bol;
|
|
||||||
prev->eol = eol;
|
|
||||||
}
|
|
||||||
|
|
||||||
next_line:
|
|
||||||
*eol = ch;
|
|
||||||
bol = eol + 1;
|
|
||||||
if (!left)
|
|
||||||
break;
|
|
||||||
left--;
|
|
||||||
lno++;
|
|
||||||
}
|
|
||||||
|
|
||||||
if (opt->unmatch_name_only) {
|
|
||||||
/* We did not see any hit, so we want to show this */
|
|
||||||
printf("%s\n", name);
|
|
||||||
return 1;
|
|
||||||
}
|
|
||||||
|
|
||||||
/* NEEDSWORK:
|
|
||||||
* The real "grep -c foo *.c" gives many "bar.c:0" lines,
|
|
||||||
* which feels mostly useless but sometimes useful. Maybe
|
|
||||||
* make it another option? For now suppress them.
|
|
||||||
*/
|
|
||||||
if (opt->count && count)
|
|
||||||
printf("%s:%u\n", name, count);
|
|
||||||
return !!last_hit;
|
|
||||||
}
|
|
||||||
|
|
||||||
static int grep_sha1(struct grep_opt *opt, const unsigned char *sha1, const char *name, int tree_name_len)
|
static int grep_sha1(struct grep_opt *opt, const unsigned char *sha1, const char *name, int tree_name_len)
|
||||||
{
|
{
|
||||||
unsigned long size;
|
unsigned long size;
|
||||||
@ -1055,7 +564,8 @@ int cmd_grep(int argc, const char **argv, const char *prefix)
|
|||||||
/* ignore empty line like grep does */
|
/* ignore empty line like grep does */
|
||||||
if (!buf[0])
|
if (!buf[0])
|
||||||
continue;
|
continue;
|
||||||
add_pattern(&opt, xstrdup(buf), argv[1], ++lno,
|
append_grep_pattern(&opt, xstrdup(buf),
|
||||||
|
argv[1], ++lno,
|
||||||
GREP_PATTERN);
|
GREP_PATTERN);
|
||||||
}
|
}
|
||||||
fclose(patterns);
|
fclose(patterns);
|
||||||
@ -1064,26 +574,31 @@ int cmd_grep(int argc, const char **argv, const char *prefix)
|
|||||||
continue;
|
continue;
|
||||||
}
|
}
|
||||||
if (!strcmp("--not", arg)) {
|
if (!strcmp("--not", arg)) {
|
||||||
add_pattern(&opt, arg, "command line", 0, GREP_NOT);
|
append_grep_pattern(&opt, arg, "command line", 0,
|
||||||
|
GREP_NOT);
|
||||||
continue;
|
continue;
|
||||||
}
|
}
|
||||||
if (!strcmp("--and", arg)) {
|
if (!strcmp("--and", arg)) {
|
||||||
add_pattern(&opt, arg, "command line", 0, GREP_AND);
|
append_grep_pattern(&opt, arg, "command line", 0,
|
||||||
|
GREP_AND);
|
||||||
continue;
|
continue;
|
||||||
}
|
}
|
||||||
if (!strcmp("--or", arg))
|
if (!strcmp("--or", arg))
|
||||||
continue; /* no-op */
|
continue; /* no-op */
|
||||||
if (!strcmp("(", arg)) {
|
if (!strcmp("(", arg)) {
|
||||||
add_pattern(&opt, arg, "command line", 0, GREP_OPEN_PAREN);
|
append_grep_pattern(&opt, arg, "command line", 0,
|
||||||
|
GREP_OPEN_PAREN);
|
||||||
continue;
|
continue;
|
||||||
}
|
}
|
||||||
if (!strcmp(")", arg)) {
|
if (!strcmp(")", arg)) {
|
||||||
add_pattern(&opt, arg, "command line", 0, GREP_CLOSE_PAREN);
|
append_grep_pattern(&opt, arg, "command line", 0,
|
||||||
|
GREP_CLOSE_PAREN);
|
||||||
continue;
|
continue;
|
||||||
}
|
}
|
||||||
if (!strcmp("-e", arg)) {
|
if (!strcmp("-e", arg)) {
|
||||||
if (1 < argc) {
|
if (1 < argc) {
|
||||||
add_pattern(&opt, argv[1], "-e option", 0,
|
append_grep_pattern(&opt, argv[1],
|
||||||
|
"-e option", 0,
|
||||||
GREP_PATTERN);
|
GREP_PATTERN);
|
||||||
argv++;
|
argv++;
|
||||||
argc--;
|
argc--;
|
||||||
@ -1106,7 +621,7 @@ int cmd_grep(int argc, const char **argv, const char *prefix)
|
|||||||
|
|
||||||
/* First unrecognized non-option token */
|
/* First unrecognized non-option token */
|
||||||
if (!opt.pattern_list) {
|
if (!opt.pattern_list) {
|
||||||
add_pattern(&opt, arg, "command line", 0,
|
append_grep_pattern(&opt, arg, "command line", 0,
|
||||||
GREP_PATTERN);
|
GREP_PATTERN);
|
||||||
break;
|
break;
|
||||||
}
|
}
|
||||||
@ -1124,8 +639,7 @@ int cmd_grep(int argc, const char **argv, const char *prefix)
|
|||||||
die("no pattern given.");
|
die("no pattern given.");
|
||||||
if ((opt.regflags != REG_NEWLINE) && opt.fixed)
|
if ((opt.regflags != REG_NEWLINE) && opt.fixed)
|
||||||
die("cannot mix --fixed-strings and regexp");
|
die("cannot mix --fixed-strings and regexp");
|
||||||
if (!opt.fixed)
|
compile_grep_patterns(&opt);
|
||||||
compile_patterns(&opt);
|
|
||||||
|
|
||||||
/* Check revs and then paths */
|
/* Check revs and then paths */
|
||||||
for (i = 1; i < argc; i++) {
|
for (i = 1; i < argc; i++) {
|
||||||
|
|||||||
440
grep.c
Normal file
440
grep.c
Normal file
@ -0,0 +1,440 @@
|
|||||||
|
#include "cache.h"
|
||||||
|
#include <regex.h>
|
||||||
|
#include "grep.h"
|
||||||
|
|
||||||
|
void append_grep_pattern(struct grep_opt *opt, const char *pat,
|
||||||
|
const char *origin, int no, enum grep_pat_token t)
|
||||||
|
{
|
||||||
|
struct grep_pat *p = xcalloc(1, sizeof(*p));
|
||||||
|
p->pattern = pat;
|
||||||
|
p->origin = origin;
|
||||||
|
p->no = no;
|
||||||
|
p->token = t;
|
||||||
|
*opt->pattern_tail = p;
|
||||||
|
opt->pattern_tail = &p->next;
|
||||||
|
p->next = NULL;
|
||||||
|
}
|
||||||
|
|
||||||
|
static void compile_regexp(struct grep_pat *p, struct grep_opt *opt)
|
||||||
|
{
|
||||||
|
int err = regcomp(&p->regexp, p->pattern, opt->regflags);
|
||||||
|
if (err) {
|
||||||
|
char errbuf[1024];
|
||||||
|
char where[1024];
|
||||||
|
if (p->no)
|
||||||
|
sprintf(where, "In '%s' at %d, ",
|
||||||
|
p->origin, p->no);
|
||||||
|
else if (p->origin)
|
||||||
|
sprintf(where, "%s, ", p->origin);
|
||||||
|
else
|
||||||
|
where[0] = 0;
|
||||||
|
regerror(err, &p->regexp, errbuf, 1024);
|
||||||
|
regfree(&p->regexp);
|
||||||
|
die("%s'%s': %s", where, p->pattern, errbuf);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
static struct grep_expr *compile_pattern_expr(struct grep_pat **);
|
||||||
|
static struct grep_expr *compile_pattern_atom(struct grep_pat **list)
|
||||||
|
{
|
||||||
|
struct grep_pat *p;
|
||||||
|
struct grep_expr *x;
|
||||||
|
|
||||||
|
p = *list;
|
||||||
|
switch (p->token) {
|
||||||
|
case GREP_PATTERN: /* atom */
|
||||||
|
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_expr(list);
|
||||||
|
if (!x)
|
||||||
|
return NULL;
|
||||||
|
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;
|
||||||
|
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);
|
||||||
|
}
|
||||||
|
|
||||||
|
void compile_grep_patterns(struct grep_opt *opt)
|
||||||
|
{
|
||||||
|
struct grep_pat *p;
|
||||||
|
|
||||||
|
if (opt->fixed)
|
||||||
|
return;
|
||||||
|
|
||||||
|
/* First compile regexps */
|
||||||
|
for (p = opt->pattern_list; p; p = p->next) {
|
||||||
|
if (p->token == GREP_PATTERN)
|
||||||
|
compile_regexp(p, opt);
|
||||||
|
else
|
||||||
|
opt->extended = 1;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (!opt->extended)
|
||||||
|
return;
|
||||||
|
|
||||||
|
/* Then bundle them up in an expression.
|
||||||
|
* A classic recursive descent parser would do.
|
||||||
|
*/
|
||||||
|
p = opt->pattern_list;
|
||||||
|
opt->pattern_expression = compile_pattern_expr(&p);
|
||||||
|
if (p)
|
||||||
|
die("incomplete pattern expression: %s", p->pattern);
|
||||||
|
}
|
||||||
|
|
||||||
|
static char *end_of_line(char *cp, unsigned long *left)
|
||||||
|
{
|
||||||
|
unsigned long l = *left;
|
||||||
|
while (l && *cp != '\n') {
|
||||||
|
l--;
|
||||||
|
cp++;
|
||||||
|
}
|
||||||
|
*left = l;
|
||||||
|
return cp;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int word_char(char ch)
|
||||||
|
{
|
||||||
|
return isalnum(ch) || ch == '_';
|
||||||
|
}
|
||||||
|
|
||||||
|
static void show_line(struct grep_opt *opt, const char *bol, const char *eol,
|
||||||
|
const char *name, unsigned lno, char sign)
|
||||||
|
{
|
||||||
|
if (opt->pathname)
|
||||||
|
printf("%s%c", name, sign);
|
||||||
|
if (opt->linenum)
|
||||||
|
printf("%d%c", lno, sign);
|
||||||
|
printf("%.*s\n", (int)(eol-bol), bol);
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* NEEDSWORK: share code with diff.c
|
||||||
|
*/
|
||||||
|
#define FIRST_FEW_BYTES 8000
|
||||||
|
static int buffer_is_binary(const char *ptr, unsigned long size)
|
||||||
|
{
|
||||||
|
if (FIRST_FEW_BYTES < size)
|
||||||
|
size = FIRST_FEW_BYTES;
|
||||||
|
return !!memchr(ptr, 0, size);
|
||||||
|
}
|
||||||
|
|
||||||
|
static int fixmatch(const char *pattern, char *line, regmatch_t *match)
|
||||||
|
{
|
||||||
|
char *hit = strstr(line, pattern);
|
||||||
|
if (!hit) {
|
||||||
|
match->rm_so = match->rm_eo = -1;
|
||||||
|
return REG_NOMATCH;
|
||||||
|
}
|
||||||
|
else {
|
||||||
|
match->rm_so = hit - line;
|
||||||
|
match->rm_eo = match->rm_so + strlen(pattern);
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
static int match_one_pattern(struct grep_opt *opt, struct grep_pat *p, char *bol, char *eol)
|
||||||
|
{
|
||||||
|
int hit = 0;
|
||||||
|
int at_true_bol = 1;
|
||||||
|
regmatch_t pmatch[10];
|
||||||
|
|
||||||
|
again:
|
||||||
|
if (!opt->fixed) {
|
||||||
|
regex_t *exp = &p->regexp;
|
||||||
|
hit = !regexec(exp, bol, ARRAY_SIZE(pmatch),
|
||||||
|
pmatch, 0);
|
||||||
|
}
|
||||||
|
else {
|
||||||
|
hit = !fixmatch(p->pattern, bol, pmatch);
|
||||||
|
}
|
||||||
|
|
||||||
|
if (hit && opt->word_regexp) {
|
||||||
|
if ((pmatch[0].rm_so < 0) ||
|
||||||
|
(eol - bol) <= pmatch[0].rm_so ||
|
||||||
|
(pmatch[0].rm_eo < 0) ||
|
||||||
|
(eol - bol) < pmatch[0].rm_eo)
|
||||||
|
die("regexp returned nonsense");
|
||||||
|
|
||||||
|
/* Match beginning must be either beginning of the
|
||||||
|
* line, or at word boundary (i.e. the last char must
|
||||||
|
* not be a word char). Similarly, match end must be
|
||||||
|
* either end of the line, or at word boundary
|
||||||
|
* (i.e. the next char must not be a word char).
|
||||||
|
*/
|
||||||
|
if ( ((pmatch[0].rm_so == 0 && at_true_bol) ||
|
||||||
|
!word_char(bol[pmatch[0].rm_so-1])) &&
|
||||||
|
((pmatch[0].rm_eo == (eol-bol)) ||
|
||||||
|
!word_char(bol[pmatch[0].rm_eo])) )
|
||||||
|
;
|
||||||
|
else
|
||||||
|
hit = 0;
|
||||||
|
|
||||||
|
if (!hit && pmatch[0].rm_so + bol + 1 < eol) {
|
||||||
|
/* There could be more than one match on the
|
||||||
|
* line, and the first match might not be
|
||||||
|
* strict word match. But later ones could be!
|
||||||
|
*/
|
||||||
|
bol = pmatch[0].rm_so + bol + 1;
|
||||||
|
at_true_bol = 0;
|
||||||
|
goto again;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
return hit;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int match_expr_eval(struct grep_opt *opt,
|
||||||
|
struct grep_expr *x,
|
||||||
|
char *bol, char *eol)
|
||||||
|
{
|
||||||
|
switch (x->node) {
|
||||||
|
case GREP_NODE_ATOM:
|
||||||
|
return match_one_pattern(opt, x->u.atom, bol, eol);
|
||||||
|
break;
|
||||||
|
case GREP_NODE_NOT:
|
||||||
|
return !match_expr_eval(opt, x->u.unary, bol, eol);
|
||||||
|
case GREP_NODE_AND:
|
||||||
|
return (match_expr_eval(opt, x->u.binary.left, bol, eol) &&
|
||||||
|
match_expr_eval(opt, x->u.binary.right, bol, eol));
|
||||||
|
case GREP_NODE_OR:
|
||||||
|
return (match_expr_eval(opt, x->u.binary.left, bol, eol) ||
|
||||||
|
match_expr_eval(opt, x->u.binary.right, bol, eol));
|
||||||
|
}
|
||||||
|
die("Unexpected node type (internal error) %d\n", x->node);
|
||||||
|
}
|
||||||
|
|
||||||
|
static int match_expr(struct grep_opt *opt, char *bol, char *eol)
|
||||||
|
{
|
||||||
|
struct grep_expr *x = opt->pattern_expression;
|
||||||
|
return match_expr_eval(opt, x, bol, eol);
|
||||||
|
}
|
||||||
|
|
||||||
|
static int match_line(struct grep_opt *opt, char *bol, char *eol)
|
||||||
|
{
|
||||||
|
struct grep_pat *p;
|
||||||
|
if (opt->extended)
|
||||||
|
return match_expr(opt, bol, eol);
|
||||||
|
for (p = opt->pattern_list; p; p = p->next) {
|
||||||
|
if (match_one_pattern(opt, p, bol, eol))
|
||||||
|
return 1;
|
||||||
|
}
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
int grep_buffer(struct grep_opt *opt, const char *name, char *buf, unsigned long size)
|
||||||
|
{
|
||||||
|
char *bol = buf;
|
||||||
|
unsigned long left = size;
|
||||||
|
unsigned lno = 1;
|
||||||
|
struct pre_context_line {
|
||||||
|
char *bol;
|
||||||
|
char *eol;
|
||||||
|
} *prev = NULL, *pcl;
|
||||||
|
unsigned last_hit = 0;
|
||||||
|
unsigned last_shown = 0;
|
||||||
|
int binary_match_only = 0;
|
||||||
|
const char *hunk_mark = "";
|
||||||
|
unsigned count = 0;
|
||||||
|
|
||||||
|
if (buffer_is_binary(buf, size)) {
|
||||||
|
switch (opt->binary) {
|
||||||
|
case GREP_BINARY_DEFAULT:
|
||||||
|
binary_match_only = 1;
|
||||||
|
break;
|
||||||
|
case GREP_BINARY_NOMATCH:
|
||||||
|
return 0; /* Assume unmatch */
|
||||||
|
break;
|
||||||
|
default:
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
if (opt->pre_context)
|
||||||
|
prev = xcalloc(opt->pre_context, sizeof(*prev));
|
||||||
|
if (opt->pre_context || opt->post_context)
|
||||||
|
hunk_mark = "--\n";
|
||||||
|
|
||||||
|
while (left) {
|
||||||
|
char *eol, ch;
|
||||||
|
int hit = 0;
|
||||||
|
|
||||||
|
eol = end_of_line(bol, &left);
|
||||||
|
ch = *eol;
|
||||||
|
*eol = 0;
|
||||||
|
|
||||||
|
hit = match_line(opt, bol, eol);
|
||||||
|
*eol = ch;
|
||||||
|
|
||||||
|
/* "grep -v -e foo -e bla" should list lines
|
||||||
|
* that do not have either, so inversion should
|
||||||
|
* be done outside.
|
||||||
|
*/
|
||||||
|
if (opt->invert)
|
||||||
|
hit = !hit;
|
||||||
|
if (opt->unmatch_name_only) {
|
||||||
|
if (hit)
|
||||||
|
return 0;
|
||||||
|
goto next_line;
|
||||||
|
}
|
||||||
|
if (hit) {
|
||||||
|
count++;
|
||||||
|
if (opt->status_only)
|
||||||
|
return 1;
|
||||||
|
if (binary_match_only) {
|
||||||
|
printf("Binary file %s matches\n", name);
|
||||||
|
return 1;
|
||||||
|
}
|
||||||
|
if (opt->name_only) {
|
||||||
|
printf("%s\n", name);
|
||||||
|
return 1;
|
||||||
|
}
|
||||||
|
/* Hit at this line. If we haven't shown the
|
||||||
|
* pre-context lines, we would need to show them.
|
||||||
|
* When asked to do "count", this still show
|
||||||
|
* the context which is nonsense, but the user
|
||||||
|
* deserves to get that ;-).
|
||||||
|
*/
|
||||||
|
if (opt->pre_context) {
|
||||||
|
unsigned from;
|
||||||
|
if (opt->pre_context < lno)
|
||||||
|
from = lno - opt->pre_context;
|
||||||
|
else
|
||||||
|
from = 1;
|
||||||
|
if (from <= last_shown)
|
||||||
|
from = last_shown + 1;
|
||||||
|
if (last_shown && from != last_shown + 1)
|
||||||
|
printf(hunk_mark);
|
||||||
|
while (from < lno) {
|
||||||
|
pcl = &prev[lno-from-1];
|
||||||
|
show_line(opt, pcl->bol, pcl->eol,
|
||||||
|
name, from, '-');
|
||||||
|
from++;
|
||||||
|
}
|
||||||
|
last_shown = lno-1;
|
||||||
|
}
|
||||||
|
if (last_shown && lno != last_shown + 1)
|
||||||
|
printf(hunk_mark);
|
||||||
|
if (!opt->count)
|
||||||
|
show_line(opt, bol, eol, name, lno, ':');
|
||||||
|
last_shown = last_hit = lno;
|
||||||
|
}
|
||||||
|
else if (last_hit &&
|
||||||
|
lno <= last_hit + opt->post_context) {
|
||||||
|
/* If the last hit is within the post context,
|
||||||
|
* we need to show this line.
|
||||||
|
*/
|
||||||
|
if (last_shown && lno != last_shown + 1)
|
||||||
|
printf(hunk_mark);
|
||||||
|
show_line(opt, bol, eol, name, lno, '-');
|
||||||
|
last_shown = lno;
|
||||||
|
}
|
||||||
|
if (opt->pre_context) {
|
||||||
|
memmove(prev+1, prev,
|
||||||
|
(opt->pre_context-1) * sizeof(*prev));
|
||||||
|
prev->bol = bol;
|
||||||
|
prev->eol = eol;
|
||||||
|
}
|
||||||
|
|
||||||
|
next_line:
|
||||||
|
bol = eol + 1;
|
||||||
|
if (!left)
|
||||||
|
break;
|
||||||
|
left--;
|
||||||
|
lno++;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (opt->status_only)
|
||||||
|
return 0;
|
||||||
|
if (opt->unmatch_name_only) {
|
||||||
|
/* We did not see any hit, so we want to show this */
|
||||||
|
printf("%s\n", name);
|
||||||
|
return 1;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* NEEDSWORK:
|
||||||
|
* The real "grep -c foo *.c" gives many "bar.c:0" lines,
|
||||||
|
* which feels mostly useless but sometimes useful. Maybe
|
||||||
|
* make it another option? For now suppress them.
|
||||||
|
*/
|
||||||
|
if (opt->count && count)
|
||||||
|
printf("%s:%u\n", name, count);
|
||||||
|
return !!last_hit;
|
||||||
|
}
|
||||||
|
|
||||||
71
grep.h
Normal file
71
grep.h
Normal file
@ -0,0 +1,71 @@
|
|||||||
|
#ifndef GREP_H
|
||||||
|
#define GREP_H
|
||||||
|
|
||||||
|
enum grep_pat_token {
|
||||||
|
GREP_PATTERN,
|
||||||
|
GREP_AND,
|
||||||
|
GREP_OPEN_PAREN,
|
||||||
|
GREP_CLOSE_PAREN,
|
||||||
|
GREP_NOT,
|
||||||
|
GREP_OR,
|
||||||
|
};
|
||||||
|
|
||||||
|
struct grep_pat {
|
||||||
|
struct grep_pat *next;
|
||||||
|
const char *origin;
|
||||||
|
int no;
|
||||||
|
enum grep_pat_token token;
|
||||||
|
const char *pattern;
|
||||||
|
regex_t regexp;
|
||||||
|
};
|
||||||
|
|
||||||
|
enum grep_expr_node {
|
||||||
|
GREP_NODE_ATOM,
|
||||||
|
GREP_NODE_NOT,
|
||||||
|
GREP_NODE_AND,
|
||||||
|
GREP_NODE_OR,
|
||||||
|
};
|
||||||
|
|
||||||
|
struct grep_expr {
|
||||||
|
enum grep_expr_node node;
|
||||||
|
union {
|
||||||
|
struct grep_pat *atom;
|
||||||
|
struct grep_expr *unary;
|
||||||
|
struct {
|
||||||
|
struct grep_expr *left;
|
||||||
|
struct grep_expr *right;
|
||||||
|
} binary;
|
||||||
|
} u;
|
||||||
|
};
|
||||||
|
|
||||||
|
struct grep_opt {
|
||||||
|
struct grep_pat *pattern_list;
|
||||||
|
struct grep_pat **pattern_tail;
|
||||||
|
struct grep_expr *pattern_expression;
|
||||||
|
int prefix_length;
|
||||||
|
regex_t regexp;
|
||||||
|
unsigned linenum:1;
|
||||||
|
unsigned invert:1;
|
||||||
|
unsigned status_only:1;
|
||||||
|
unsigned name_only:1;
|
||||||
|
unsigned unmatch_name_only:1;
|
||||||
|
unsigned count:1;
|
||||||
|
unsigned word_regexp:1;
|
||||||
|
unsigned fixed:1;
|
||||||
|
#define GREP_BINARY_DEFAULT 0
|
||||||
|
#define GREP_BINARY_NOMATCH 1
|
||||||
|
#define GREP_BINARY_TEXT 2
|
||||||
|
unsigned binary:2;
|
||||||
|
unsigned extended:1;
|
||||||
|
unsigned relative:1;
|
||||||
|
unsigned pathname:1;
|
||||||
|
int regflags;
|
||||||
|
unsigned pre_context;
|
||||||
|
unsigned post_context;
|
||||||
|
};
|
||||||
|
|
||||||
|
extern void append_grep_pattern(struct grep_opt *opt, const char *pat, const char *origin, int no, enum grep_pat_token t);
|
||||||
|
extern void compile_grep_patterns(struct grep_opt *opt);
|
||||||
|
extern int grep_buffer(struct grep_opt *opt, const char *name, char *buf, unsigned long size);
|
||||||
|
|
||||||
|
#endif
|
||||||
Loading…
x
Reference in New Issue
Block a user