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