real_asmrp.c
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上传用户:kjfoods
上传日期:2020-07-06
资源大小:29949k
文件大小:11k
源码类别:
midi
开发平台:
Unix_Linux
- /*
- * Copyright (C) 2002-2004 the xine project
- *
- * This file is part of xine, a free video player.
- *
- * xine 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.
- *
- * xine 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, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
- *
- * $Id: 057e230e7823400e3b022b1621aa8384a4e4671f $
- *
- * a parser for real's asm rules
- *
- * grammar for these rules:
- *
- rule_book = { rule }
- rule = ( '#' condition { ',' assignment } | [ assignment {',' assignment} ]) ';'
- assignment = id '=' const
- const = ( number | string )
- condition = comp_expr { ( '&&' | '||' ) comp_expr }
- comp_expr = operand { ( '<' | '<=' | '==' | '>=' | '>' ) operand }
- operand = ( '$' id | num | '(' condition ')' )
- */
- #include "real.h"
- #define ASMRP_SYM_NONE 0
- #define ASMRP_SYM_EOF 1
- #define ASMRP_SYM_NUM 2
- #define ASMRP_SYM_ID 3
- #define ASMRP_SYM_STRING 4
- #define ASMRP_SYM_HASH 10
- #define ASMRP_SYM_SEMICOLON 11
- #define ASMRP_SYM_COMMA 12
- #define ASMRP_SYM_EQUALS 13
- #define ASMRP_SYM_AND 14
- #define ASMRP_SYM_OR 15
- #define ASMRP_SYM_LESS 16
- #define ASMRP_SYM_LEQ 17
- #define ASMRP_SYM_GEQ 18
- #define ASMRP_SYM_GREATER 19
- #define ASMRP_SYM_DOLLAR 20
- #define ASMRP_SYM_LPAREN 21
- #define ASMRP_SYM_RPAREN 22
- #define ASMRP_MAX_ID 1024
- #define ASMRP_MAX_SYMTAB 10
- typedef struct {
- char *id;
- int v;
- } asmrp_sym_t;
- typedef struct {
- /* public part */
- int sym;
- int num;
- char str[ASMRP_MAX_ID];
- /* private part */
- char *buf;
- int pos;
- char ch;
- asmrp_sym_t sym_tab[ASMRP_MAX_SYMTAB];
- int sym_tab_num;
- } asmrp_t;
- static asmrp_t *asmrp_new (void ) {
- asmrp_t *p;
- p = malloc (sizeof (asmrp_t));
- p->sym_tab_num = 0;
- p->sym = ASMRP_SYM_NONE;
- p->buf = NULL;
- return p;
- }
- static void asmrp_dispose (asmrp_t *p) {
- int i;
- for (i=0; i<p->sym_tab_num; i++)
- free (p->sym_tab[i].id);
- free( p->buf );
- free( p );
- }
- static void asmrp_getch (asmrp_t *p) {
- p->ch = p->buf[p->pos];
- p->pos++;
- lprintf ("%cn", p->ch);
- }
- static void asmrp_init (asmrp_t *p, const char *str) {
- p->buf = strdup (str);
- p->pos = 0;
- asmrp_getch (p);
- }
- static void asmrp_number (asmrp_t *p) {
- int num;
- num = 0;
- while ( (p->ch>='0') && (p->ch<='9') ) {
- num = num*10 + (p->ch - '0');
- asmrp_getch (p);
- }
- p->sym = ASMRP_SYM_NUM;
- p->num = num;
- }
- static void asmrp_string (asmrp_t *p) {
- int l;
- l = 0;
- while ( (p->ch!='"') && (p->ch>=32) ) {
- p->str[l] = p->ch;
- l++;
- asmrp_getch (p);
- }
- p->str[l]=0;
- if (p->ch=='"')
- asmrp_getch (p);
- p->sym = ASMRP_SYM_STRING;
- }
- static void asmrp_identifier (asmrp_t *p) {
- int l;
- l = 0;
- while ( ((p->ch>='A') && (p->ch<='z'))
- || ((p->ch>='0') && (p->ch<='9'))) {
- p->str[l] = p->ch;
- l++;
- asmrp_getch (p);
- }
- p->str[l]=0;
- p->sym = ASMRP_SYM_ID;
- }
- #ifdef LOG
- static void asmrp_print_sym (asmrp_t *p) {
- printf ("symbol: ");
- switch (p->sym) {
- case ASMRP_SYM_NONE:
- printf ("NONEn");
- break;
- case ASMRP_SYM_EOF:
- printf ("EOFn");
- break;
- case ASMRP_SYM_NUM:
- printf ("NUM %dn", p->num);
- break;
- case ASMRP_SYM_ID:
- printf ("ID '%s'n", p->str);
- break;
- case ASMRP_SYM_STRING:
- printf ("STRING "%s"n", p->str);
- break;
- case ASMRP_SYM_HASH:
- printf ("#n");
- break;
- case ASMRP_SYM_SEMICOLON:
- printf (";n");
- break;
- case ASMRP_SYM_COMMA:
- printf (",n");
- break;
- case ASMRP_SYM_EQUALS:
- printf ("==n");
- break;
- case ASMRP_SYM_AND:
- printf ("&&n");
- break;
- case ASMRP_SYM_OR:
- printf ("||n");
- break;
- case ASMRP_SYM_LESS:
- printf ("<n");
- break;
- case ASMRP_SYM_LEQ:
- printf ("<=n");
- break;
- case ASMRP_SYM_GEQ:
- printf (">=n");
- break;
- case ASMRP_SYM_GREATER:
- printf (">n");
- break;
- case ASMRP_SYM_DOLLAR:
- printf ("$n");
- break;
- case ASMRP_SYM_LPAREN:
- printf ("(n");
- break;
- case ASMRP_SYM_RPAREN:
- printf (")n");
- break;
- default:
- printf ("unknown symbol %dn", p->sym);
- }
- }
- #endif
- static void asmrp_get_sym (asmrp_t *p) {
- while (p->ch <= 32) {
- if (p->ch == 0) {
- p->sym = ASMRP_SYM_EOF;
- return;
- }
- asmrp_getch (p);
- }
- if (p->ch == '\')
- asmrp_getch (p);
- switch (p->ch) {
- case '#':
- p->sym = ASMRP_SYM_HASH;
- asmrp_getch (p);
- break;
- case ';':
- p->sym = ASMRP_SYM_SEMICOLON;
- asmrp_getch (p);
- break;
- case ',':
- p->sym = ASMRP_SYM_COMMA;
- asmrp_getch (p);
- break;
- case '=':
- p->sym = ASMRP_SYM_EQUALS;
- asmrp_getch (p);
- if (p->ch=='=')
- asmrp_getch (p);
- break;
- case '&':
- p->sym = ASMRP_SYM_AND;
- asmrp_getch (p);
- if (p->ch=='&')
- asmrp_getch (p);
- break;
- case '|':
- p->sym = ASMRP_SYM_OR;
- asmrp_getch (p);
- if (p->ch=='|')
- asmrp_getch (p);
- break;
- case '<':
- p->sym = ASMRP_SYM_LESS;
- asmrp_getch (p);
- if (p->ch=='=') {
- p->sym = ASMRP_SYM_LEQ;
- asmrp_getch (p);
- }
- break;
- case '>':
- p->sym = ASMRP_SYM_GREATER;
- asmrp_getch (p);
- if (p->ch=='=') {
- p->sym = ASMRP_SYM_GEQ;
- asmrp_getch (p);
- }
- break;
- case '$':
- p->sym = ASMRP_SYM_DOLLAR;
- asmrp_getch (p);
- break;
- case '(':
- p->sym = ASMRP_SYM_LPAREN;
- asmrp_getch (p);
- break;
- case ')':
- p->sym = ASMRP_SYM_RPAREN;
- asmrp_getch (p);
- break;
- case '"':
- asmrp_getch (p);
- asmrp_string (p);
- break;
- case '0': case '1': case '2': case '3': case '4':
- case '5': case '6': case '7': case '8': case '9':
- asmrp_number (p);
- break;
- default:
- asmrp_identifier (p);
- }
- #ifdef LOG
- asmrp_print_sym (p);
- #endif
- }
- static int asmrp_find_id (asmrp_t *p, const char *s) {
- int i;
- for (i=0; i<p->sym_tab_num; i++) {
- if (!strcmp (s, p->sym_tab[i].id))
- return i;
- }
- return -1;
- }
- static int asmrp_set_id (asmrp_t *p, const char *s, int v) {
- int i;
- i = asmrp_find_id (p, s);
- if (i<0) {
- i = p->sym_tab_num;
- p->sym_tab_num++;
- p->sym_tab[i].id = strdup (s);
- lprintf ("new symbol '%s'n", s);
- }
- p->sym_tab[i].v = v;
- lprintf ("symbol '%s' assigned %dn", s, v);
- return i;
- }
- static int asmrp_condition (asmrp_t *p) ;
- static int asmrp_operand (asmrp_t *p) {
- int i, ret;
- lprintf ("operandn");
- ret = 0;
- switch (p->sym) {
- case ASMRP_SYM_DOLLAR:
- asmrp_get_sym (p);
- if (p->sym != ASMRP_SYM_ID) {
- printf ("error: identifier expected.n");
- break;
- }
- i = asmrp_find_id (p, p->str);
- if (i<0) {
- lprintf ("error: unknown identifier %sn", p->str);
- }
- ret = p->sym_tab[i].v;
- asmrp_get_sym (p);
- break;
- case ASMRP_SYM_NUM:
- ret = p->num;
- asmrp_get_sym (p);
- break;
- case ASMRP_SYM_LPAREN:
- asmrp_get_sym (p);
- ret = asmrp_condition (p);
- if (p->sym != ASMRP_SYM_RPAREN) {
- printf ("error: ) expected.n");
- break;
- }
- asmrp_get_sym (p);
- break;
- default:
- lprintf ("syntax error, $ number or ( expectedn");
- break;
- }
- lprintf ("operand done, =%dn", ret);
- return ret;
- }
- static int asmrp_comp_expression (asmrp_t *p) {
- int a;
- lprintf ("comp_expressionn");
- a = asmrp_operand (p);
- while ( (p->sym == ASMRP_SYM_LESS)
- || (p->sym == ASMRP_SYM_LEQ)
- || (p->sym == ASMRP_SYM_EQUALS)
- || (p->sym == ASMRP_SYM_GEQ)
- || (p->sym == ASMRP_SYM_GREATER) ) {
- int op = p->sym;
- int b;
- asmrp_get_sym (p);
- b = asmrp_operand (p);
- switch (op) {
- case ASMRP_SYM_LESS:
- a = a<b;
- break;
- case ASMRP_SYM_LEQ:
- a = a<=b;
- break;
- case ASMRP_SYM_EQUALS:
- a = a==b;
- break;
- case ASMRP_SYM_GEQ:
- a = a>=b;
- break;
- case ASMRP_SYM_GREATER:
- a = a>b;
- break;
- }
- }
- lprintf ("comp_expression done = %dn", a);
- return a;
- }
- static int asmrp_condition (asmrp_t *p) {
- int a;
- lprintf ("conditionn");
- a = asmrp_comp_expression (p);
- while ( (p->sym == ASMRP_SYM_AND) || (p->sym == ASMRP_SYM_OR) ) {
- int op, b;
- op = p->sym;
- asmrp_get_sym (p);
- b = asmrp_comp_expression (p);
- switch (op) {
- case ASMRP_SYM_AND:
- a = a & b;
- break;
- case ASMRP_SYM_OR:
- a = a | b;
- break;
- }
- }
- lprintf ("condition done = %dn", a);
- return a;
- }
- static void asmrp_assignment (asmrp_t *p) {
- lprintf ("assignmentn");
- if (p->sym == ASMRP_SYM_COMMA || p->sym == ASMRP_SYM_SEMICOLON) {
- lprintf ("empty assignmentn");
- return;
- }
- if (p->sym != ASMRP_SYM_ID) {
- printf ("error: identifier expectedn");
- return;
- }
- asmrp_get_sym (p);
- if (p->sym != ASMRP_SYM_EQUALS) {
- printf ("error: = expectedn");
- return;
- }
- asmrp_get_sym (p);
- if ( (p->sym != ASMRP_SYM_NUM) && (p->sym != ASMRP_SYM_STRING)
- && (p->sym != ASMRP_SYM_ID)) {
- printf ("error: number or string expectedn");
- return;
- }
- asmrp_get_sym (p);
- lprintf ("assignment donen");
- }
- static int asmrp_rule (asmrp_t *p) {
- int ret;
- lprintf ("rulen");
- ret = 1;
- if (p->sym == ASMRP_SYM_HASH) {
- asmrp_get_sym (p);
- ret = asmrp_condition (p);
- while (p->sym == ASMRP_SYM_COMMA) {
- asmrp_get_sym (p);
- asmrp_assignment (p);
- }
- } else if (p->sym != ASMRP_SYM_SEMICOLON) {
- asmrp_assignment (p);
- while (p->sym == ASMRP_SYM_COMMA) {
- asmrp_get_sym (p);
- asmrp_assignment (p);
- }
- }
- lprintf ("rule done = %dn", ret);
- if (p->sym != ASMRP_SYM_SEMICOLON) {
- printf ("semicolon expected.n");
- return ret;
- }
- asmrp_get_sym (p);
- return ret;
- }
- static int asmrp_eval (asmrp_t *p, int *matches, int matchsize) {
- int rule_num, num_matches;
- lprintf ("evaln");
- asmrp_get_sym (p);
- rule_num = 0; num_matches = 0;
- while (p->sym != ASMRP_SYM_EOF && num_matches < matchsize - 1) {
- if (asmrp_rule (p)) {
- lprintf ("rule #%d is truen", rule_num);
- matches[num_matches] = rule_num;
- num_matches++;
- }
- rule_num++;
- }
- matches[num_matches] = -1;
- return num_matches;
- }
- int asmrp_match (const char *rules, int bandwidth, int *matches, int matchsize) {
- asmrp_t *p;
- int num_matches;
- p = asmrp_new ();
- asmrp_init (p, rules);
- asmrp_set_id (p, "Bandwidth", bandwidth);
- asmrp_set_id (p, "OldPNMPlayer", 0);
- num_matches = asmrp_eval (p, matches, matchsize);
- asmrp_dispose (p);
- return num_matches;
- }