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/*************************************************************************
* Copyright (C) 2009 Tavian Barnes <tavianator@gmail.com> *
* *
* This file is part of Dimension. *
* *
* Dimension 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 3 of the License, or (at *
* your option) any later version. *
* *
* Dimension 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 "tokenize.h"
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <sys/mman.h>
#include <unistd.h>
dmnsn_array *
dmnsn_tokenize(FILE *file)
{
if (fseeko(file, 0, SEEK_END) != 0) {
fprintf(stderr, "Couldn't seek on input stream.\n");
return NULL;
}
off_t size = ftello(file);
int fd = fileno(file);
if (fd == -1) {
fprintf(stderr, "Couldn't get file descriptor to input stream.\n");
return NULL;
}
char *map = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0), *next = map;
if (map == MAP_FAILED) {
fprintf(stderr, "Couldn't mmap() input stream.\n");
return NULL;
}
dmnsn_token token;
dmnsn_array *tokens = dmnsn_new_array(sizeof(dmnsn_token));
while (next - map < size) {
/* Saves us some code repetition in the vast majority of cases */
token.value = NULL;
switch (*next) {
case ' ':
case '\n':
case '\r':
case '\t':
case '\f':
case '\v':
/* Skip whitespace */
++next;
continue;
/* Macro to make basic symbol tokens easier */
#define dmnsn_simple_token(c, tp) \
case c: \
token.type = tp; \
break
/* Some simple punctuation marks */
dmnsn_simple_token('{', DMNSN_LBRACE);
dmnsn_simple_token('}', DMNSN_RBRACE);
dmnsn_simple_token('(', DMNSN_LPAREN);
dmnsn_simple_token(')', DMNSN_RPAREN);
dmnsn_simple_token('[', DMNSN_LBRACKET);
dmnsn_simple_token(']', DMNSN_RBRACKET);
dmnsn_simple_token('<', DMNSN_LT);
dmnsn_simple_token('>', DMNSN_GT);
dmnsn_simple_token('+', DMNSN_PLUS);
dmnsn_simple_token('-', DMNSN_MINUS);
dmnsn_simple_token('*', DMNSN_STAR);
dmnsn_simple_token('/', DMNSN_SLASH);
dmnsn_simple_token(',', DMNSN_COMMA);
default:
/* Unrecognised character */
fprintf(stderr, "Unrecognized character 0x%X in input.\n",
(unsigned int)*next);
dmnsn_delete_tokens(tokens);
munmap(map, size);
return NULL;
}
dmnsn_array_push(tokens, &token);
++next;
}
munmap(map, size);
return tokens;
}
void
dmnsn_delete_tokens(dmnsn_array *tokens)
{
dmnsn_token *token;
unsigned int i;
for (i = 0; i < dmnsn_array_size(tokens); ++i) {
token = dmnsn_array_at(tokens, i);
free(token->value);
}
dmnsn_delete_array(tokens);
}
static const char *dmnsn_token_name(dmnsn_token_type token_type);
static void
dmnsn_print_token(FILE *file, dmnsn_token *token)
{
if (token->value) {
fprintf(file, "(%s \"%s\")", dmnsn_token_name(token->type), token->value);
} else {
fprintf(file, "%s", dmnsn_token_name(token->type));
}
}
void
dmnsn_print_token_sexpr(FILE *file, dmnsn_array *tokens)
{
unsigned int i;
if (dmnsn_array_size(tokens) == 0) {
fprintf(file, "()");
} else {
fprintf(file, "(");
dmnsn_print_token(file, dmnsn_array_at(tokens, 0));
for (i = 1; i < dmnsn_array_size(tokens); ++i) {
fprintf(file, " ");
dmnsn_print_token(file, dmnsn_array_at(tokens, i));
}
fprintf(file, ")");
}
fprintf(file, "\n");
}
static const char *
dmnsn_token_name(dmnsn_token_type token_type)
{
switch (token_type) {
/* Macro to shorten this huge switch */
#define dmnsn_token_map(type, str) \
case type: \
return str;
dmnsn_token_map(DMNSN_LBRACE, "{");
dmnsn_token_map(DMNSN_RBRACE, "}")
dmnsn_token_map(DMNSN_LPAREN, "\\(");
dmnsn_token_map(DMNSN_RPAREN, "\\)");
dmnsn_token_map(DMNSN_LBRACKET, "[");
dmnsn_token_map(DMNSN_RBRACKET, "]");
dmnsn_token_map(DMNSN_LT, "<");
dmnsn_token_map(DMNSN_GT, ">");
dmnsn_token_map(DMNSN_PLUS, "+");
dmnsn_token_map(DMNSN_MINUS, "-");
dmnsn_token_map(DMNSN_STAR, "*");
dmnsn_token_map(DMNSN_SLASH, "/");
dmnsn_token_map(DMNSN_COMMA, ",");
default:
printf("Warning: unrecognised token %d.\n", (int)token_type);
return "unrecognized-token";
}
}
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