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#ifndef GREP_H
#define GREP_H
#include "color.h"
#ifdef USE_LIBPCRE
#include <pcre.h>
#else
typedef int pcre;
typedef int pcre_extra;
#endif
#include "kwset.h"
#include "thread-utils.h"
#include "userdiff.h"

enum grep_pat_token {
GREP_PATTERN,
GREP_PATTERN_HEAD,
GREP_PATTERN_BODY,
GREP_AND,
GREP_OPEN_PAREN,
GREP_CLOSE_PAREN,
GREP_NOT,
GREP_OR
};

enum grep_context {
GREP_CONTEXT_HEAD,
GREP_CONTEXT_BODY
};

enum grep_header_field {
GREP_HEADER_AUTHOR = 0,
GREP_HEADER_COMMITTER,
GREP_HEADER_REFLOG,

/* Must be at the end of the enum */
GREP_HEADER_FIELD_MAX
};

struct grep_pat {
struct grep_pat *next;
const char *origin;
int no;
enum grep_pat_token token;
char *pattern;
size_t patternlen;
enum grep_header_field field;
regex_t regexp;
pcre *pcre_regexp;
pcre_extra *pcre_extra_info;
kwset_t kws;
unsigned fixed:1;
unsigned ignore_case:1;
unsigned word_regexp:1;
};

enum grep_expr_node {
GREP_NODE_ATOM,
GREP_NODE_NOT,
GREP_NODE_AND,
GREP_NODE_TRUE,
GREP_NODE_OR
};

enum grep_pattern_type {
GREP_PATTERN_TYPE_UNSPECIFIED = 0,
GREP_PATTERN_TYPE_BRE,
GREP_PATTERN_TYPE_ERE,
GREP_PATTERN_TYPE_FIXED,
GREP_PATTERN_TYPE_PCRE
};

struct grep_expr {
enum grep_expr_node node;
unsigned hit;
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_pat *header_list;
struct grep_pat **header_tail;
struct grep_expr *pattern_expression;
const char *prefix;
int prefix_length;
regex_t regexp;
int linenum;
int invert;
int ignore_case;
int status_only;
int name_only;
int unmatch_name_only;
int count;
int word_regexp;
int fixed;
int all_match;
int debug;
#define GREP_BINARY_DEFAULT 0
#define GREP_BINARY_NOMATCH 1
#define GREP_BINARY_TEXT 2
int binary;
int extended;
int use_reflog_filter;
int pcre;
int relative;
int pathname;
int null_following_name;
int color;
int max_depth;
int funcname;
int funcbody;
int extended_regexp_option;
int pattern_type_option;
char color_context[COLOR_MAXLEN];
char color_filename[COLOR_MAXLEN];
char color_function[COLOR_MAXLEN];
char color_lineno[COLOR_MAXLEN];
char color_match[COLOR_MAXLEN];
char color_selected[COLOR_MAXLEN];
char color_sep[COLOR_MAXLEN];
int regflags;
unsigned pre_context;
unsigned post_context;
unsigned last_shown;
int show_hunk_mark;
int file_break;
int heading;
void *priv;

void (*output)(struct grep_opt *opt, const void *data, size_t size);
void *output_priv;
};

extern void init_grep_defaults(void);
extern int grep_config(const char *var, const char *value, void *);
extern void grep_init(struct grep_opt *, const char *prefix);
void grep_set_pattern_type_option(enum grep_pattern_type, struct grep_opt *opt);
void grep_commit_pattern_type(enum grep_pattern_type, struct grep_opt *opt);

extern void append_grep_pat(struct grep_opt *opt, const char *pat, size_t patlen, const char *origin, int no, enum grep_pat_token t);
extern void append_grep_pattern(struct grep_opt *opt, const char *pat, const char *origin, int no, enum grep_pat_token t);
extern void append_header_grep_pattern(struct grep_opt *, enum grep_header_field, const char *);
extern void compile_grep_patterns(struct grep_opt *opt);
extern void free_grep_patterns(struct grep_opt *opt);
extern int grep_buffer(struct grep_opt *opt, char *buf, unsigned long size);

struct grep_source {
char *name;

enum grep_source_type {
GREP_SOURCE_SHA1,
GREP_SOURCE_FILE,
GREP_SOURCE_BUF,
} type;
void *identifier;

char *buf;
unsigned long size;

char *path; /* for attribute lookups */
struct userdiff_driver *driver;
};

void grep_source_init(struct grep_source *gs, enum grep_source_type type,
const char *name, const char *path,
const void *identifier);
void grep_source_clear_data(struct grep_source *gs);
void grep_source_clear(struct grep_source *gs);
void grep_source_load_driver(struct grep_source *gs);


int grep_source(struct grep_opt *opt, struct grep_source *gs);

extern struct grep_opt *grep_opt_dup(const struct grep_opt *opt);
extern int grep_threads_ok(const struct grep_opt *opt);

#ifndef NO_PTHREADS
/*
* Mutex used around access to the attributes machinery if
* opt->use_threads. Must be initialized/destroyed by callers!
*/
extern int grep_use_locks;
extern pthread_mutex_t grep_attr_mutex;
extern pthread_mutex_t grep_read_mutex;

static inline void grep_read_lock(void)
{
if (grep_use_locks)
pthread_mutex_lock(&grep_read_mutex);
}

static inline void grep_read_unlock(void)
{
if (grep_use_locks)
pthread_mutex_unlock(&grep_read_mutex);
}

#else
#define grep_read_lock()
#define grep_read_unlock()
#endif

#endif
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