613 lines
11 KiB
C
613 lines
11 KiB
C
/*
|
|
* token lex for finsh shell.
|
|
*
|
|
* COPYRIGHT (C) 2006 - 2013, RT-Thread Development Team
|
|
*
|
|
* This file is part of RT-Thread (http://www.rt-thread.org)
|
|
* Maintainer: bernard.xiong <bernard.xiong at gmail.com>
|
|
*
|
|
* All rights reserved.
|
|
*
|
|
* 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, write to the Free Software Foundation, Inc.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*
|
|
* Change Logs:
|
|
* Date Author Notes
|
|
* 2010-03-22 Bernard first version
|
|
* 2013-04-03 Bernard strip more characters.
|
|
*/
|
|
#include <finsh.h>
|
|
#include <stdlib.h>
|
|
|
|
#include "finsh_token.h"
|
|
#include "finsh_error.h"
|
|
|
|
#define is_alpha(ch) ((ch | 0x20) - 'a') < 26u
|
|
#define is_digit(ch) ((ch) >= '0' && (ch) <= '9')
|
|
#define is_separator(ch) !(((ch) >= 'a' && (ch) <= 'z') \
|
|
|| ((ch) >= 'A' && (ch) <= 'Z') || ((ch) >= '0' && (ch) <= '9') || ((ch) == '_'))
|
|
#define is_eof(self) (self)->eof
|
|
|
|
struct name_table
|
|
{
|
|
char* name;
|
|
enum finsh_token_type type;
|
|
};
|
|
|
|
/* keyword */
|
|
static const struct name_table finsh_name_table[] =
|
|
{
|
|
{"void", finsh_token_type_void},
|
|
{"char", finsh_token_type_char},
|
|
{"short", finsh_token_type_short},
|
|
{"int", finsh_token_type_int},
|
|
{"long", finsh_token_type_long},
|
|
{"unsigned", finsh_token_type_unsigned},
|
|
|
|
{"NULL", finsh_token_type_value_null},
|
|
{"null", finsh_token_type_value_null}
|
|
};
|
|
|
|
static char token_next_char(struct finsh_token* self);
|
|
static void token_prev_char(struct finsh_token* self);
|
|
static long token_spec_number(char* string, int length, int b);
|
|
static void token_run(struct finsh_token* self);
|
|
static int token_match_name(struct finsh_token* self, const char* str);
|
|
static void token_proc_number(struct finsh_token* self);
|
|
static u_char* token_proc_string(struct finsh_token* self);
|
|
static void token_trim_space(struct finsh_token* self);
|
|
static char token_proc_char(struct finsh_token* self);
|
|
static int token_proc_escape(struct finsh_token* self);
|
|
|
|
void finsh_token_init(struct finsh_token* self, u_char* line)
|
|
{
|
|
memset(self, 0, sizeof(struct finsh_token));
|
|
|
|
self->line = line;
|
|
}
|
|
|
|
enum finsh_token_type finsh_token_token(struct finsh_token* self)
|
|
{
|
|
if ( self->replay ) self->replay = 0;
|
|
else token_run(self);
|
|
|
|
return (enum finsh_token_type)self->current_token;
|
|
}
|
|
|
|
void finsh_token_get_token(struct finsh_token* self, u_char* token)
|
|
{
|
|
strncpy((char*)token, (char*)self->string, FINSH_NAME_MAX);
|
|
}
|
|
|
|
int token_get_string(struct finsh_token* self, u_char* str)
|
|
{
|
|
unsigned char *p=str;
|
|
char ch;
|
|
|
|
ch = token_next_char(self);
|
|
if (is_eof(self)) return -1;
|
|
|
|
str[0] = '\0';
|
|
|
|
if ( is_digit(ch) )/*the first character of identifier is not a digit.*/
|
|
{
|
|
token_prev_char(self);
|
|
return -1;
|
|
}
|
|
|
|
while (!is_separator(ch) && !is_eof(self))
|
|
{
|
|
*p++ = ch;
|
|
|
|
ch = token_next_char(self);
|
|
}
|
|
self->eof = 0;
|
|
|
|
token_prev_char(self);
|
|
*p = '\0';
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
get next character.
|
|
*/
|
|
static char token_next_char(struct finsh_token* self)
|
|
{
|
|
if (self->eof) return '\0';
|
|
|
|
if (self->position == (int)strlen((char*)self->line) || self->line[self->position] =='\n')
|
|
{
|
|
self->eof = 1;
|
|
self->position = 0;
|
|
return '\0';
|
|
}
|
|
|
|
return self->line[self->position++];
|
|
}
|
|
|
|
static void token_prev_char(struct finsh_token* self)
|
|
{
|
|
if ( self->eof ) return;
|
|
|
|
if ( self->position == 0 ) return;
|
|
else self->position--;
|
|
}
|
|
|
|
static void token_run(struct finsh_token* self)
|
|
{
|
|
char ch;
|
|
|
|
token_trim_space(self); /* first trim space and tab. */
|
|
token_get_string(self, &(self->string[0]));
|
|
|
|
if ( is_eof(self) ) /*if it is eof, break;*/
|
|
{
|
|
self->current_token = finsh_token_type_eof;
|
|
return ;
|
|
}
|
|
|
|
if (self->string[0] != '\0') /*It is a key word or a identifier.*/
|
|
{
|
|
if ( !token_match_name(self, (char*)self->string) )
|
|
{
|
|
self->current_token = finsh_token_type_identifier;
|
|
}
|
|
}
|
|
else/*It is a operator character.*/
|
|
{
|
|
ch = token_next_char(self);
|
|
|
|
switch ( ch )
|
|
{
|
|
case '(':
|
|
self->current_token = finsh_token_type_left_paren;
|
|
break;
|
|
|
|
case ')':
|
|
self->current_token = finsh_token_type_right_paren;
|
|
break;
|
|
|
|
case ',':
|
|
self->current_token = finsh_token_type_comma;
|
|
break;
|
|
|
|
case ';':
|
|
self->current_token = finsh_token_type_semicolon;
|
|
break;
|
|
|
|
case '&':
|
|
self->current_token = finsh_token_type_and;
|
|
break;
|
|
|
|
case '*':
|
|
self->current_token = finsh_token_type_mul;
|
|
break;
|
|
|
|
case '+':
|
|
ch = token_next_char(self);
|
|
|
|
if ( ch == '+' )
|
|
{
|
|
self->current_token = finsh_token_type_inc;
|
|
}
|
|
else
|
|
{
|
|
token_prev_char(self);
|
|
self->current_token = finsh_token_type_add;
|
|
}
|
|
break;
|
|
|
|
case '-':
|
|
ch = token_next_char(self);
|
|
|
|
if ( ch == '-' )
|
|
{
|
|
self->current_token = finsh_token_type_dec;
|
|
}
|
|
else
|
|
{
|
|
token_prev_char(self);
|
|
self->current_token = finsh_token_type_sub;
|
|
}
|
|
break;
|
|
|
|
case '/':
|
|
ch = token_next_char(self);
|
|
if (ch == '/')
|
|
{
|
|
/* line comments, set to end of file */
|
|
self->current_token = finsh_token_type_eof;
|
|
}
|
|
else
|
|
{
|
|
token_prev_char(self);
|
|
self->current_token = finsh_token_type_div;
|
|
}
|
|
break;
|
|
|
|
case '<':
|
|
ch = token_next_char(self);
|
|
|
|
if ( ch == '<' )
|
|
{
|
|
self->current_token = finsh_token_type_shl;
|
|
}
|
|
else
|
|
{
|
|
token_prev_char(self);
|
|
self->current_token = finsh_token_type_bad;
|
|
}
|
|
break;
|
|
|
|
case '>':
|
|
ch = token_next_char(self);
|
|
|
|
if ( ch == '>' )
|
|
{
|
|
self->current_token = finsh_token_type_shr;
|
|
}
|
|
else
|
|
{
|
|
token_prev_char(self);
|
|
self->current_token = finsh_token_type_bad;
|
|
}
|
|
break;
|
|
|
|
case '|':
|
|
self->current_token = finsh_token_type_or;
|
|
break;
|
|
|
|
case '%':
|
|
self->current_token = finsh_token_type_mod;
|
|
break;
|
|
|
|
case '~':
|
|
self->current_token = finsh_token_type_bitwise;
|
|
break;
|
|
|
|
case '^':
|
|
self->current_token = finsh_token_type_xor;
|
|
break;
|
|
|
|
case '=':
|
|
self->current_token = finsh_token_type_assign;
|
|
break;
|
|
|
|
case '\'':
|
|
self->value.char_value = token_proc_char(self);
|
|
self->current_token = finsh_token_type_value_char;
|
|
break;
|
|
|
|
case '"':
|
|
token_proc_string(self);
|
|
self->current_token = finsh_token_type_value_string;
|
|
break;
|
|
|
|
default:
|
|
if ( is_digit(ch) )
|
|
{
|
|
token_prev_char(self);
|
|
token_proc_number(self);
|
|
break;
|
|
}
|
|
|
|
finsh_error_set(FINSH_ERROR_UNKNOWN_TOKEN);
|
|
self->current_token = finsh_token_type_bad;
|
|
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int token_match_name(struct finsh_token* self, const char* str)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < sizeof(finsh_name_table)/sizeof(struct name_table); i++)
|
|
{
|
|
if ( strcmp(finsh_name_table[i].name, str)==0 )
|
|
{
|
|
self->current_token = finsh_name_table[i].type;
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void token_trim_space(struct finsh_token* self)
|
|
{
|
|
char ch;
|
|
while ( (ch = token_next_char(self)) ==' ' ||
|
|
ch == '\t' ||
|
|
ch == '\r');
|
|
|
|
token_prev_char(self);
|
|
}
|
|
|
|
static char token_proc_char(struct finsh_token* self)
|
|
{
|
|
char ch;
|
|
char buf[4], *p;
|
|
|
|
p = buf;
|
|
ch = token_next_char(self);
|
|
|
|
if ( ch == '\\' )
|
|
{
|
|
ch = token_next_char(self);
|
|
switch ( ch )
|
|
{
|
|
case 'n': ch = '\n'; break;
|
|
case 't': ch = '\t'; break;
|
|
case 'v': ch = '\v'; break;
|
|
case 'b': ch = '\b'; break;
|
|
case 'r': ch = '\r'; break;
|
|
case '\\': ch = '\\'; break;
|
|
case '\'': ch = '\''; break;
|
|
default :
|
|
while ( is_digit(ch) )/*for '\113' char*/
|
|
{
|
|
ch = token_next_char(self);
|
|
*p++ = ch;
|
|
}
|
|
|
|
token_prev_char(self);
|
|
*p = '\0';
|
|
ch = atoi(p);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if ( token_next_char(self) != '\'' )
|
|
{
|
|
token_prev_char(self);
|
|
finsh_error_set(FINSH_ERROR_EXPECT_CHAR);
|
|
return ch;
|
|
}
|
|
|
|
return ch;
|
|
}
|
|
|
|
static u_char* token_proc_string(struct finsh_token* self)
|
|
{
|
|
u_char* p;
|
|
|
|
for ( p = &self->string[0]; p - &(self->string[0]) < FINSH_STRING_MAX; )
|
|
{
|
|
char ch = token_next_char(self);
|
|
|
|
if ( is_eof(self) )
|
|
{
|
|
finsh_error_set(FINSH_ERROR_UNEXPECT_END);
|
|
return NULL;;
|
|
}
|
|
if ( ch == '\\' )
|
|
{
|
|
ch = token_proc_escape(self);
|
|
}
|
|
else if ( ch == '"' )/*end of string.*/
|
|
{
|
|
*p = '\0';
|
|
return self->string;
|
|
}
|
|
|
|
*p++ = ch;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static int token_proc_escape(struct finsh_token* self)
|
|
{
|
|
char ch;
|
|
int result=0;
|
|
|
|
ch = token_next_char(self);
|
|
switch (ch)
|
|
{
|
|
case 'n':
|
|
result = '\n';
|
|
break;
|
|
case 't':
|
|
result = '\t';
|
|
break;
|
|
case 'v':
|
|
result = '\v';
|
|
break;
|
|
case 'b':
|
|
result = '\b';
|
|
break;
|
|
case 'r':
|
|
result = '\r';
|
|
break;
|
|
case 'f':
|
|
result = '\f';
|
|
break;
|
|
case 'a':
|
|
result = '\007';
|
|
break;
|
|
case 'x':
|
|
result = 0;
|
|
ch = token_next_char(self);
|
|
while ( (ch - '0')<16u )
|
|
{
|
|
result = result*16 + ch - '0';
|
|
ch = token_next_char(self);
|
|
}
|
|
token_prev_char(self);
|
|
break;
|
|
default:
|
|
if ( (ch - '0') < 8u)
|
|
{
|
|
result = 0;
|
|
while ( (ch - '0') < 8u )
|
|
{
|
|
result = result*8 + ch - '0';
|
|
ch = token_next_char(self);
|
|
}
|
|
|
|
token_prev_char(self);
|
|
}
|
|
break;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
(0|0x|0X|0b|0B)number+(l|L)
|
|
*/
|
|
static void token_proc_number(struct finsh_token* self)
|
|
{
|
|
char ch;
|
|
char *p, buf[128];
|
|
long value;
|
|
|
|
value = 0;
|
|
p = buf;
|
|
|
|
ch = token_next_char(self);
|
|
if ( ch == '0' )
|
|
{
|
|
int b;
|
|
ch = token_next_char(self);
|
|
if ( ch == 'x' || ch == 'X' )/*it's a hex number*/
|
|
{
|
|
b = 16;
|
|
ch = token_next_char(self);
|
|
while ( is_digit(ch) || is_alpha(ch) )
|
|
{
|
|
*p++ = ch;
|
|
ch = token_next_char(self);
|
|
}
|
|
|
|
*p = '\0';
|
|
}
|
|
else if ( ch == 'b' || ch == 'B' )
|
|
{
|
|
b = 2;
|
|
ch = token_next_char(self);
|
|
while ( (ch=='0')||(ch=='1') )
|
|
{
|
|
*p++ = ch;
|
|
ch = token_next_char(self);
|
|
}
|
|
|
|
*p = '\0';
|
|
}
|
|
else if ( '0' <= ch && ch <= '7' )
|
|
{
|
|
b = 8;
|
|
while ( '0' <= ch && ch <= '7' )
|
|
{
|
|
*p++ = ch;
|
|
ch = token_next_char(self);
|
|
}
|
|
|
|
*p = '\0';
|
|
}
|
|
else
|
|
{
|
|
token_prev_char(self);
|
|
|
|
/* made as 0 value */
|
|
self->value.int_value = 0;
|
|
self->current_token = finsh_token_type_value_int;
|
|
return;
|
|
}
|
|
|
|
self->value.int_value = token_spec_number(buf, strlen(buf), b);
|
|
self->current_token = finsh_token_type_value_int;
|
|
}
|
|
else
|
|
{
|
|
while ( is_digit(ch) )
|
|
{
|
|
value = value*10 + ( ch - '0' );
|
|
ch = token_next_char(self);
|
|
}
|
|
|
|
self->value.int_value = value;
|
|
self->current_token = finsh_token_type_value_int;
|
|
}
|
|
|
|
switch ( ch )
|
|
{
|
|
case 'l':
|
|
case 'L':
|
|
self->current_token = finsh_token_type_value_long;
|
|
break;
|
|
|
|
default:
|
|
token_prev_char(self);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*use 64 bit number*/
|
|
#define BN_SIZE 2
|
|
|
|
static long token_spec_number(char* string, int length, int b)
|
|
{
|
|
char* p;
|
|
int t;
|
|
int i, j, shift=1;
|
|
unsigned int bn[BN_SIZE], v;
|
|
long d;
|
|
|
|
p = string;
|
|
i = 0;
|
|
|
|
switch ( b )
|
|
{
|
|
case 16: shift = 4;
|
|
break;
|
|
case 8: shift = 3;
|
|
break;
|
|
case 2: shift = 1;
|
|
break;
|
|
default: break;
|
|
}
|
|
|
|
for ( j=0; j<BN_SIZE ; j++) bn[j] = 0;
|
|
|
|
while ( i<length )
|
|
{
|
|
t = *p++;
|
|
if ( t>='a' && t <='f' )
|
|
{
|
|
t = t - 'a' +10;
|
|
}
|
|
else if ( t >='A' && t <='F' )
|
|
{
|
|
t = t - 'A' +10;
|
|
}
|
|
else t = t - '0';
|
|
|
|
for ( j=0; j<BN_SIZE ; j++)
|
|
{
|
|
v = bn[j];
|
|
bn[j] = (v<<shift) | t;
|
|
t = v >> (32 - shift);
|
|
}
|
|
i++;
|
|
}
|
|
|
|
d = (long)bn[0];
|
|
|
|
return d;
|
|
}
|