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/****************************************************************************
* bfs *
* Copyright (C) 2015-2018 Tavian Barnes <tavianator@tavianator.com> *
* *
* Permission to use, copy, modify, and/or distribute this software for any *
* purpose with or without fee is hereby granted. *
* *
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES *
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF *
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR *
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES *
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN *
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF *
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. *
****************************************************************************/
#ifndef BFS_EXPR_H
#define BFS_EXPR_H
#include "color.h"
#include "exec.h"
#include "printf.h"
#include "stat.h"
#include <regex.h>
#include <stdbool.h>
#include <stddef.h>
#include <sys/types.h>
#include <time.h>
/**
* A command line expression.
*/
struct expr;
/**
* Ephemeral state for evaluating an expression.
*/
struct eval_state;
/**
* Expression evaluation function.
*
* @param expr
* The current expression.
* @param state
* The current evaluation state.
* @return
* The result of the test.
*/
typedef bool eval_fn(const struct expr *expr, struct eval_state *state);
/**
* Possible types of numeric comparison.
*/
enum cmp_flag {
/** Exactly n. */
CMP_EXACT,
/** Less than n. */
CMP_LESS,
/** Greater than n. */
CMP_GREATER,
};
/**
* Possible types of mode comparison.
*/
enum mode_cmp {
/** Mode is an exact match (MODE). */
MODE_EXACT,
/** Mode has all these bits (-MODE). */
MODE_ALL,
/** Mode has any of these bits (/MODE). */
MODE_ANY,
};
/**
* Possible time units.
*/
enum time_unit {
/** Minutes. */
MINUTES,
/** Days. */
DAYS,
};
/**
* Possible file size units.
*/
enum size_unit {
/** 512-byte blocks. */
SIZE_BLOCKS,
/** Single bytes. */
SIZE_BYTES,
/** Two-byte words. */
SIZE_WORDS,
/** Kibibytes. */
SIZE_KB,
/** Mebibytes. */
SIZE_MB,
/** Gibibytes. */
SIZE_GB,
/** Tebibytes. */
SIZE_TB,
/** Pebibytes. */
SIZE_PB,
};
struct expr {
/** The function that evaluates this expression. */
eval_fn *eval;
/** The left hand side of the expression. */
struct expr *lhs;
/** The right hand side of the expression. */
struct expr *rhs;
/** Whether this expression has no side effects. */
bool pure;
/** Whether this expression always evaluates to true. */
bool always_true;
/** Whether this expression always evaluates to false. */
bool always_false;
/** Estimated cost. */
double cost;
/** Estimated probability of success. */
double probability;
/** Number of times this predicate was executed. */
size_t evaluations;
/** Number of times this predicate succeeded. */
size_t successes;
/** Total time spent running this predicate. */
struct timespec elapsed;
/** The number of command line arguments for this expression. */
size_t argc;
/** The command line arguments comprising this expression. */
char **argv;
/** The optional comparison flag. */
enum cmp_flag cmp_flag;
/** The mode comparison flag. */
enum mode_cmp mode_cmp;
/** Mode to use for files. */
mode_t file_mode;
/** Mode to use for directories (different due to X). */
mode_t dir_mode;
/** The optional stat field to look at. */
enum bfs_stat_field stat_field;
/** The optional reference time. */
struct timespec reftime;
/** The optional time unit. */
enum time_unit time_unit;
/** The optional size unit. */
enum size_unit size_unit;
/** Optional device number for a target file. */
dev_t dev;
/** Optional inode number for a target file. */
ino_t ino;
/** File to output to. */
CFILE *cfile;
/** Optional compiled regex. */
regex_t *regex;
/** Optional exec command. */
struct bfs_exec *execbuf;
/** Optional printf command. */
struct bfs_printf *printf;
/** Optional integer data for this expression. */
long long idata;
/** Optional string data for this expression. */
const char *sdata;
/** The number of files this expression keeps open between evaluations. */
int persistent_fds;
/** The number of files this expression opens during evaluation. */
int ephemeral_fds;
};
/** Singleton true expression instance. */
extern struct expr expr_true;
/** Singleton false expression instance. */
extern struct expr expr_false;
/**
* Create a new expression.
*/
struct expr *new_expr(eval_fn *eval, size_t argc, char **argv);
/**
* @return Whether expr is known to always quit.
*/
bool expr_never_returns(const struct expr *expr);
/**
* @return The result of the comparison for this expression.
*/
bool expr_cmp(const struct expr *expr, long long n);
/**
* Dump a parsed expression.
*/
void dump_expr(CFILE *cfile, const struct expr *expr, bool verbose);
/**
* Free an expression tree.
*/
void free_expr(struct expr *expr);
#endif // BFS_EXPR_H
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