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/*********************************************************************
* bfs *
* Copyright (C) 2015 Tavian Barnes <tavianator@tavianator.com> *
* *
* This program is free software. It comes without any warranty, to *
* the extent permitted by applicable law. You can redistribute it *
* and/or modify it under the terms of the Do What The Fuck You Want *
* To Public License, Version 2, as published by Sam Hocevar. See *
* the COPYING file or http://www.wtfpl.net/ for more details. *
*********************************************************************/
#ifndef BFS_H
#define BFS_H
#include "color.h"
#include <stdbool.h>
#include <stddef.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);
/**
* The parsed command line.
*/
struct cmdline {
/** The array of paths to start from. */
const char **roots;
/** The number of root paths. */
size_t nroots;
/** Color data. */
struct color_table *colors;
/** -color option. */
bool color;
/** -mindepth option. */
int mindepth;
/** -maxdepth option. */
int maxdepth;
/** bftw() flags. */
int flags;
/** The command line expression. */
struct expr *expr;
/** The current time. */
struct timespec now;
};
/**
* Possible types of numeric comparison.
*/
enum cmpflag {
/** Exactly n. */
CMP_EXACT,
/** Less than n. */
CMP_LESS,
/** Greater than n. */
CMP_GREATER,
};
/**
* Available struct stat time fields.
*/
enum timefield {
/** Access time. */
ATIME,
/** Status change time. */
CTIME,
/** Modification time. */
MTIME,
};
/**
* Possible time units.
*/
enum timeunit {
/** Minutes. */
MINUTES,
/** Days. */
DAYS,
};
struct expr {
/** The left hand side of the expression. */
struct expr *lhs;
/** The right hand side of the expression. */
struct expr *rhs;
/** The function that evaluates this expression. */
eval_fn *eval;
/** The optional comparison flag. */
enum cmpflag cmp;
/** The optional time field. */
enum timefield timefield;
/** The optional time unit. */
enum timeunit timeunit;
/** Optional integer data for this expression. */
int idata;
/** Optional string data for this expression. */
const char *sdata;
};
/**
* Parse the command line.
*/
struct cmdline *parse_cmdline(int argc, char *argv[]);
/**
* Evaluate the command line.
*/
int eval_cmdline(struct cmdline *cl);
/**
* Free the parsed command line.
*/
void free_cmdline(struct cmdline *cl);
// Predicate evaluation functions
bool eval_true(const struct expr *expr, struct eval_state *state);
bool eval_false(const struct expr *expr, struct eval_state *state);
bool eval_access(const struct expr *expr, struct eval_state *state);
bool eval_acmtime(const struct expr *expr, struct eval_state *state);
bool eval_gid(const struct expr *expr, struct eval_state *state);
bool eval_uid(const struct expr *expr, struct eval_state *state);
bool eval_empty(const struct expr *expr, struct eval_state *state);
bool eval_hidden(const struct expr *expr, struct eval_state *state);
bool eval_type(const struct expr *expr, struct eval_state *state);
bool eval_name(const struct expr *expr, struct eval_state *state);
bool eval_path(const struct expr *expr, struct eval_state *state);
bool eval_delete(const struct expr *expr, struct eval_state *state);
bool eval_nohidden(const struct expr *expr, struct eval_state *state);
bool eval_print(const struct expr *expr, struct eval_state *state);
bool eval_print0(const struct expr *expr, struct eval_state *state);
bool eval_prune(const struct expr *expr, struct eval_state *state);
bool eval_quit(const struct expr *expr, struct eval_state *state);
// Operator evaluation functions
bool eval_not(const struct expr *expr, struct eval_state *state);
bool eval_and(const struct expr *expr, struct eval_state *state);
bool eval_or(const struct expr *expr, struct eval_state *state);
bool eval_comma(const struct expr *expr, struct eval_state *state);
#endif // BFS_H
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