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>
diff --git a/grep.h b/grep.h
new file mode 100644
index 0000000..80122b0
--- /dev/null
+++ b/grep.h
@@ -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
