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expr.c
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/*
* Copyright 2008-2013 Various Authors
* Copyright 2005 Timo Hirvonen
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "expr.h"
#include "glob.h"
#include "uchar.h"
#include "track_info.h"
#include "comment.h"
#include "xmalloc.h"
#include "utils.h"
#include "debug.h"
#include "list.h"
#include "ui_curses.h" /* using_utf8, charset */
#include "convert.h"
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <stdarg.h>
#include <limits.h>
enum token_type {
/* speacial chars */
TOK_NOT,
TOK_LT,
TOK_GT,
#define NR_COMBINATIONS TOK_EQ
/* speacial chars */
TOK_EQ,
TOK_AND,
TOK_OR,
TOK_LPAREN,
TOK_RPAREN,
#define NR_SPECIALS TOK_NE
#define COMB_BASE TOK_NE
/* same as the first 3 + '=' */
TOK_NE,
TOK_LE,
TOK_GE,
TOK_KEY,
TOK_INT_OR_KEY,
TOK_STR
};
#define NR_TOKS (TOK_STR + 1)
struct token {
struct list_head node;
enum token_type type;
/* for TOK_KEY, TOK_INT_OR_KEY and TOK_STR */
char str[];
};
/* same order as TOK_* */
static const char specials[NR_SPECIALS] = "!<>=&|()";
static const int tok_to_op[NR_TOKS] = {
-1, OP_LT, OP_GT, OP_EQ, -1, -1, -1, -1, OP_NE, OP_LE, OP_GE, -1, -1, -1
};
static const char * const op_names[NR_OPS] = { "<", "<=", "=", ">=", ">", "!=" };
static const char * const expr_names[NR_EXPRS] = {
"&", "|", "!", "a string", "an integer", "a boolean"
};
static char error_buf[64] = { 0, };
static void set_error(const char *format, ...)
{
va_list ap;
va_start(ap, format);
vsnprintf(error_buf, sizeof(error_buf)
8000
, format, ap);
va_end(ap);
}
static struct token *get_str(const char *str, int *idxp)
{
struct token *tok;
int s = *idxp + 1;
int e = s;
/* can't remove all backslashes here => don't remove any */
while (str[e] != '"') {
int c = str[e];
if (c == 0)
goto err;
if (c == '\\') {
if (str[e + 1] == 0)
goto err;
e += 2;
continue;
}
e++;
}
tok = xmalloc(sizeof(struct token) + e - s + 1);
memcpy(tok->str, str + s, e - s);
tok->str[e - s] = 0;
tok->type = TOK_STR;
*idxp = e + 1;
return tok;
err:
set_error("end of expression at middle of string");
return NULL;
}
static struct token *get_int_or_key(const char *str, int *idxp)
{
int s = *idxp;
int e = s;
int digits_only = 1;
struct token *tok;
if (str[e] == '-')
e++;
while (str[e]) {
int i, c = str[e];
for (i = 0; i < NR_SPECIALS; i++) {
if (c == specials[i])
goto out;
}
if (c < '0' || c > '9') {
digits_only = 0;
if (!isalpha(c) && c != '_' && c != '-') {
set_error("unexpected '%c'", c);
return NULL;
}
}
e++;
}
out:
tok = xmalloc(sizeof(struct token) + e - s + 1);
memcpy(tok->str, str + s, e - s);
tok->str[e - s] = 0;
tok->type = TOK_KEY;
if (digits_only)
tok->type = TOK_INT_OR_KEY;
*idxp = e;
return tok;
}
static struct token *get_token(const char *str, int *idxp)
{
int idx = *idxp;
int c, i;
c = str[idx];
for (i = 0; i < NR_SPECIALS; i++) {
struct token *tok;
if (c != specials[i])
continue;
idx++;
tok = xnew(struct token, 1);
tok->type = i;
if (i < NR_COMBINATIONS && str[idx] == '=') {
tok->type = COMB_BASE + i;
idx++;
}
*idxp = idx;
return tok;
}
if (c == '"')
return get_str(str, idxp);
return get_int_or_key(str, idxp);
}
static void free_tokens(struct list_head *head)
{
struct list_head *item = head->next;
while (item != head) {
struct list_head *next = item->next;
struct token *tok = container_of(item, struct token, node);
free(tok);
item = next;
}
}
static int tokenize(struct list_head *head, const char *str)
{
struct token *tok;
int idx = 0;
while (1) {
if (str[idx] == 0)
break;
tok = get_token(str, &idx);
if (tok == NULL) {
free_tokens(head);
return -1;
}
list_add_tail(&tok->node, head);
}
return 0;
}
static struct expr *expr_new(int type)
{
struct expr *new = xnew(struct expr, 1);
new->type = type;
new->key = NULL;
new->parent = NULL;
new->left = NULL;
new->right = NULL;
return new;
}
static int parse(struct expr **rootp, struct list_head *head, struct list_head **itemp, int level);
static int parse_one(struct expr **exprp, struct list_head *head, struct list_head **itemp)
{
struct list_head *item = *itemp;
struct token *tok;
enum token_type type;
int rc;
*exprp = NULL;
if (item == head) {
set_error("expression expected");
return -1;
}
tok = container_of(item, struct token, node);
type = tok->type;
if (type == TOK_NOT) {
struct expr *new, *tmp;
*itemp = item->next;
rc = parse_one(&tmp, head, itemp);
if (rc)
return rc;
new = expr_new(EXPR_NOT);
new->left = tmp;
*exprp = new;
return 0;
} else if (type == TOK_LPAREN) {
*itemp = item->next;
*exprp = NULL;
return parse(exprp, head, itemp, 1);
/* ')' already eaten */
} else if (type == TOK_KEY || type == TOK_INT_OR_KEY) {
const char *key = tok->str;
struct expr *new;
int op = -1;
item = item->next;
if (item != head) {
tok = container_of(item, struct token, node);
op = tok_to_op[tok->type];
}
if (item == head || op == -1) {
/* must be a bool */
new = expr_new(EXPR_BOOL);
new->key = xstrdup(key);
*itemp = item;
*exprp = new;
return 0;
}
item = item->next;
if (item == head) {
set_error("right side of expression expected");
return -1;
}
tok = container_of(item, struct token, node);
type = tok->type;
*itemp = item->next;
if (type == TOK_STR) {
if (op != OP_EQ && op != OP_NE) {
set_error("invalid string operator '%s'", op_names[op]);
return -1;
}
new = expr_new(EXPR_STR);
new->key = xstrdup(key);
glob_compile(&new->estr.glob_head, tok->str);
new->estr.op = op;
*exprp = new;
return 0;
} else if (type == TOK_INT_OR_KEY) {
long int val = 0;
if (str_to_int(tok->str, &val)) {
}
new = expr_new(EXPR_INT);
new->key = xstrdup(key);
new->eint.val = val;
new->eint.op = op;
*exprp = new;
return 0;
}
if (op == OP_EQ || op == OP_NE) {
set_error("integer or string expected");
} else {
set_error("integer expected");
}
return -1;
}
set_error("key expected");
return -1;
}
static void add(struct expr **rootp, struct expr *expr)
{
struct expr *tmp, *root = *rootp;
if (root == NULL) {
*rootp = expr;
return;
}
tmp = root;
while (tmp->right)
tmp = tmp->right;
if (tmp->type <= EXPR_OR) {
/* tmp is binary, tree is incomplete */
tmp->right = expr;
expr->parent = tmp;
return;
}
/* tmp is unary, tree is complete
* expr must be a binary operator */
BUG_ON(expr->type > EXPR_OR);
expr->left = root;
root->parent = expr;
*rootp = expr;
}
static int parse(struct expr **rootp, struct list_head *head, struct list_head **itemp, int level)
{
struct list_head *item = *itemp;
while (1) {
struct token *tok;
struct expr *expr;
int rc, type;
rc = parse_one(&expr, head, &item);
if (rc)
return rc;
add(rootp, expr);
if (item == head) {
if (level > 0) {
set_error("')' expected");
return -1;
}
*itemp = item;
return 0;
}
tok = container_of(item, struct token, node);
if (tok->type == TOK_RPAREN) {
if (level == 0) {
set_error("unexpected ')'");
return -1;
}
*itemp = item->next;
return 0;
}
if (tok->type == TOK_AND) {
type = EXPR_AND;
} else if (tok->type == TOK_OR) {
type = EXPR_OR;
} else {
set_error("'&' or '|' expected");
return -1;
}
expr = expr_new(type);
add(rootp, expr);
item = item->next;
}
}
static const struct {
char short_key;
const char *long_key;
} map_short2long[] = {
{ 'A', "albumartist" },
{ 'D', "discnumber" },
{ 'T', "tag", },
{ 'a', "artist" },
{ 'c', "comment" },
{ 'd', "duration" },
{ 'f', "filename" },
{ 'g', "genre" },
{ 'l', "album" },
{ 'n', "tracknumber" },
{ 's', "stream" },
{ 't', "title" },
{ 'y', "date" },
{ '\0', NULL },
};
static const struct {
const char *key;
enum expr_type type;
} builtin[] = {
{ "album", EXPR_STR },
{ "albumartist",EXPR_STR },
{ "artist", EXPR_STR },
{ "bitrate", EXPR_INT },
{ "codec", EXPR_STR },
{ "codec_profile",EXPR_STR },
{ "comment", EXPR_STR },
{ "date", EXPR_INT },
{ "discnumber", EXPR_INT },
{ "duration", EXPR_INT },
{ "filename", EXPR_STR },
{ "genre", EXPR_STR },
{ "media", EXPR_STR },
{ "originaldate",EXPR_INT },
{ "stream", EXPR_BOOL },
{ "tag", EXPR_BOOL },
{ "title", EXPR_STR },
{ "tracknumber",EXPR_INT },
{ NULL, -1 },
};
static const char *lookup_long_key(char c)
{
int i;
for (i = 0; map_short2long[i].short_key; i++) {
if (map_short2long[i].short_key == c)
return map_short2long[i].long_key;
}
return NULL;
}
static enum expr_type lookup_key_type(const char *key)
{
int i;
for (i = 0; builtin[i].key; i++) {
int cmp = strcmp(key, builtin[i].key);
if (cmp == 0)
return builtin[i].type;
if (cmp < 0)
break;
}
return -1;
}
static unsigned long stack4_new(void)
{
return 0;
}
static void stack4_push(unsigned long *s, unsigned long e)
{
*s = (*s << 4) | e;
}
static void stack4_pop(unsigned long *s)
{
*s = *s >> 4;
}
static unsigned long stack4_top(unsigned long s)
{
return s & 0xf;
}
static void stack4_replace_top(unsigned long *s, unsigned long e)
{
*s = (*s & ~0xf) | e;
}
static char *expand_short_expr(const char *expr_short)
{
/* state space, can contain maximal 15 states */
enum state_type {
ST_SKIP_SPACE = 1,
ST_TOP,
ST_EXPECT_KEY,
ST_EXPECT_OP,
ST_EXPECT_INT,
ST_IN_INT,
ST_MEM_INT,
ST_IN_2ND_INT,
ST_EXPECT_STR,
ST_IN_QUOTE_STR,
ST_IN_STR,
};
size_t len_expr_short = strlen(expr_short);
/* worst case blowup of expr_short is 31/5 (e.g. ~n1-2), so take x7:
* strlen("~n1-2") == 5
* strlen("(tracknumber>=1&tracknumber<=2)") == 31
*/
char *out = xnew(char, len_expr_short * 7);
char *num = NULL;
size_t i, i_num = 0, k = 0;
const char *key = NULL;
int level = 0;
enum expr_type etype;
/* used as state-stack, can contain at least 32/4 = 8 states */
unsigned long state_stack = stack4_new();
stack4_push(&state_stack, ST_TOP);
stack4_push(&state_stack, ST_SKIP_SPACE);
/* include terminal '\0' to recognize end of string */
for (i = 0; i <= len_expr_short; i++) {
unsigned char c = expr_short[i];
switch (stack4_top(state_stack)) {
case ST_SKIP_SPACE:
if (c != ' ') {
stack4_pop(&state_stack);
i--;
}
break;
case ST_TOP:
switch (c) {
case '~':
stack4_push(&state_stack, ST_EXPECT_OP);
stack4_push(&state_stack, ST_SKIP_SPACE);
stack4_push(&state_stack, ST_EXPECT_KEY);
break;
case '(':
level++;
/* Fall through */
case '!':
case '|':
out[k++] = c;
stack4_push(&state_stack, ST_SKIP_SPACE);
break;
case ')':
level--;
out[k++] = c;
stack4_push(&state_stack, ST_EXPECT_OP);
stack4_push(&state_stack, ST_SKIP_SPACE);
break;
case '\0':
if (level > 0) {
set_error("')' expected");
goto error_exit;
}
out[k++] = c;
break;
default:
set_error("unexpected '%c'", c);
goto error_exit;
}
break;
case ST_EXPECT_KEY:
stack4_pop(&state_stack);
key = lookup_long_key(c);
if (!key) {
set_error("unkown short key %c", c);
goto error_exit;
}
etype = lookup_key_type(key);
if (etype == EXPR_INT) {
stack4_push(&state_stack, ST_EXPECT_INT);
out[k++] = '(';
} else if (etype == EXPR_STR) {
stack4_push(&state_stack, ST_EXPECT_STR);
} else if (etype != EXPR_BOOL) {
BUG("wrong etype: %d\n", etype);
}
strcpy(out+k, key);
k += strlen(key);
stack4_push(&state_stack, ST_SKIP_SPACE);
break;
case ST_EXPECT_OP:
if (c == '~' || c == '(' || c == '!')
out[k++] = '&';
i--;
stack4_replace_top(&state_stack, ST_SKIP_SPACE);
break;
case ST_EXPECT_INT:
if (c == '<' || c == '>') {
out[k++] = c;
stack4_replace_top(&state_stack, ST_IN_INT);
} else if (c == '-') {
out[k++] = '<';
out[k++] = '=';
stack4_replace_top(&state_stack, ST_IN_INT);
} else if (isdigit(c)) {
if (!num)
num = xnew(char, len_expr_short);
num[i_num++] = c;
stack4_replace_top(&state_stack, ST_MEM_INT);
} else {
set_error("integer expected", expr_short);
goto error_exit;
}
break;
case ST_IN_INT:
if (isdigit(c)) {
out[k++] = c;
} else {
i -= 1;
stack4_pop(&state_stack);
out[k++] = ')';
}
break;
case ST_MEM_INT:
if (isdigit(c)) {
num[i_num++] = c;
} else {
if (c == '-') {
out[k++] = '>';
out[k++] = '=';
stack4_replace_top(&state_stack, ST_IN_2ND_INT);
} else {
out[k++] = '=';
i--;
stack4_pop(&state_stack);
}
strncpy(out+k, num, i_num);
k += i_num;
i_num = 0;
if (c != '-')
out[k++] = ')';
}
break;
case ST_IN_2ND_INT:
if (isdigit(c)) {
num[i_num++] = c;
} else {
i--;
stack4_pop(&state_stack);
if (i_num > 0) {
out[k++] = '&';
strcpy(out+k, key);
k += strlen(key);
out[k++] = '<';
out[k++] = '=';
strncpy(out+k, num, i_num);
k += i_num;
}
out[k++] = ')';
}
break;
case ST_EXPECT_STR:
out[k++] = '=';
if (c == '"') {
stack4_replace_top(&state_stack, ST_IN_QUOTE_STR);
out[k++] = c;
} else {
stack4_replace_top(&state_stack, ST_IN_STR);
out[k++] = '"';
out[k++] = '*';
out[k++] = c;
}
break;
case ST_IN_QUOTE_STR:
if (c == '"' && expr_short[i-1] != '\\') {
stack4_pop(&state_stack);
}
out[k++] = c;
break;
case ST_IN_STR:
/* isalnum() doesn't work for multi-byte characters */
if (c != '~' && c != '!' && c != '|' &&
c != '(' && c != ')' && c != '\0') {
out[k++] = c;
} else {
while (k > 0 && out[k-1] == ' ')
k--;
out[k++] = '*';
out[k++] = '"';
i--;
stack4_pop(&state_stack);
}
break;
default:
BUG("state %ld not covered", stack4_top(state_stack));
break;
}
}
if (num)
free(num);
d_print("expanded \"%s\" to \"%s\"\n", expr_short, out);
return out;
error_exit:
if (num)
free(num);
free(out);
return NULL;
}
int expr_is_short(const char *str)
{
int i;
for (i = 0; str[i]; i++) {
if (str[i] == '~')
return 1;
if (str[i] != '!' && str[i] != '(' && str[i] != ' ')
return 0;
}
return 0;
}
struct expr *expr_parse(const char *str)
{
LIST_HEAD(head);
struct expr *root = NULL;
struct list_head *item;
char *long_str = NULL, *u_str = NULL;
int i;
for (i = 0; str[i]; i++) {
unsigned char c = str[i];
if (c < 0x20) {
set_error("filter contains control characters");
goto out;
}
}
if (!using_utf8 && utf8_encode(str, charset, &u_str) == 0) {
str = u_str;
}
if (!u_is_valid(str)) {
set_error("invalid UTF-8");
goto out;
}
if (expr_is_short(str)) {
str = long_str = expand_short_expr(str);
if (!str)
goto out;
}
if (tokenize(&head, str))
goto out;
item = head.next;
if (parse(&root, &head, &item, 0))
root = NULL;
free_tokens(&head);
out:
free(u_str);
free(long_str);
return root;
}
int expr_check_leaves(struct expr **exprp, const char *(*get_filter)(const char *name))
{
struct expr *expr = *exprp;
struct expr *e;
const char *filter;
int i, rc;
if (expr->left) {
if (expr_check_leaves(&expr->left, get_filter))
return -1;
if (expr->right)
return expr_check_leaves(&expr->right, get_filter);
return 0;
}
for (i = 0; builtin[i].key; i++) {
int cmp = strcmp(expr->key, builtin[i].key);
if (cmp > 0)
continue;
if (cmp < 0)
break;
if (builtin[i].type != expr->type) {
/* type mismatch */
set_error("%s is %s", builtin[i].key, expr_names[builtin[i].type]);
return -1;
}
return 0;
}
if (expr->type != EXPR_BOOL) {
/* unknown key */
set_error("unknown key %s", expr->key);
return -1;
}
/* user defined filter */
filter = get_filter(expr->key);
if (filter == NULL) {
set_error("unknown filter or boolean %s", expr->key);
return -1;
}
e = expr_parse(filter);
if (e == NULL) {
return -1;
}
rc = expr_check_leaves(&e, get_filter);
if (rc) {
expr_free(e);
return rc;
}
/* replace */
e->parent = expr->parent;
expr_free(expr);
/* this sets parents left pointer */
*exprp = e;
return 0;
}
unsigned int expr_get_match_type(struct expr *expr)
{
const char *key;
if (expr->left) {
unsigned int left = expr_get_match_type(expr->left);
if (expr->type == EXPR_AND || expr->type == EXPR_OR)
return left | expr_get_match_type(expr->right);
return left;
}
key = expr->key;
if (strcmp(key, "artist") == 0 || strcmp(key, "albumartist") == 0)
return TI_MATCH_ARTIST;
if (strcmp(key, "album") == 0 || strcmp(key, "discnumber") == 0)
return TI_MATCH_ALBUM;
if (strcmp(key, "title") == 0 || strcmp(key, "tracknumber") == 0)
return TI_MATCH_TITLE;
return 0;
}
int expr_is_harmless(const struct expr *expr)
{
switch (expr->type) {
case EXPR_OR:
case EXPR_NOT:
return 0;
case EXPR_AND:
expr = expr->right;
default:
break;
}
if (expr->type == EXPR_INT) {
switch (expr->eint.op) {
case IOP_LT:
case IOP_EQ:
case IOP_LE:
return 0;
default:
return 1;
}
}
return 1;
}
int expr_eval(struct expr *expr, struct track_info *ti)
{
enum expr_type type = expr->type;
const char *key;
if (expr->left) {
int left = expr_eval(expr->left, ti);
if (type == EXPR_AND)
return left && expr_eval(expr->right, ti);
if (type == EXPR_OR)
return left || expr_eval(expr->right, ti);
/* EXPR_NOT */
return !left;
}
key = expr->key;
if (type == EXPR_STR) {
const char *val;
char *uval = NULL;
int res;
if (strcmp(key, "filename") == 0) {
val = ti->filename;
if (!using_utf8 && utf8_encode(val, charset, &uval) == 0)
val = uval;
} else if (strcmp(key, "codec") == 0) {
val = ti->codec;
} else if (strcmp(key, "codec_profile") == 0) {
val = ti->codec_profile;
} else {
val = keyvals_get_val(ti->comments, key);
}
/* non-existing string tag equals to "" */
if (!val)
val = "";
res = glob_match(&expr->estr.glob_head, val);
free(uval);
if (expr->estr.op == SOP_EQ)
return res;
return !res;
} else if (type == EXPR_INT) {
int val, res;
if (strcmp(key, "duration") == 0) {
val = ti->duration;
/* duration of a stream is infinite (well, almost) */
if (is_http_url(ti->filename))
val = INT_MAX;
} else if (strcmp(key, "date") == 0) {
val = (ti->date >= 0) ? (ti->date / 10000) : -1;
} else if (strcmp(key, "originaldate") == 0) {
val = (ti->originaldate >= 0) ? (ti->originaldate / 10000) : -1;
} else if (strcmp(key, "bitrate") == 0) {
val = (ti->bitrate >= 0) ? (int) (ti->bitrate / 1000. + 0.5) : -1;
} else {
val = comments_get_int(ti->comments, key);
}
if (expr->eint.val == -1) {
/* -1 is "not set"
* doesn't make sense to do 123 < "not set"
* but it makes sense to do date=-1 (date is not set)
*/
if (expr->eint.op == IOP_EQ)
return val == -1;
if (expr->eint.op == IOP_NE)
return val != -1;
}
if (val == -1) {
/* tag not set, can't compare */
return 0;
}
res = val - expr->eint.val;
switch (expr->eint.op) {
case IOP_LT:
return res < 0;
case IOP_LE:
return res <= 0;
case IOP_EQ:
return res == 0;
case IOP_GE:
return res >= 0;
case IOP_GT:
return res > 0;
case IOP_NE:
return res != 0;
}
}
if (strcmp(key, "stream") == 0)
return is_http_url(ti->filename);
return track_info_has_tag(ti);
}
void expr_free(struct expr *expr)
{
if (expr->left) {
expr_free(expr->left);
if (expr->right)
expr_free(expr->right);
}
free(expr->key);
if (expr->type == EXPR_STR)
glob_free(&expr->estr.glob_head);
free(expr);
}
const char *expr_error(void)
{
return error_buf;
}