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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 "parse.h"
#include "tokenize.h"
#include "utility.h"
#include <stdlib.h>
#include <stdio.h>
#include <locale.h>
static int
dmnsn_parse_expect(dmnsn_token_type type, const dmnsn_array *tokens,
unsigned int *ip)
{
dmnsn_token token;
if (*ip < dmnsn_array_size(tokens)) {
dmnsn_array_get(tokens, *ip, &token);
if (token.type != type) {
dmnsn_diagnostic(token.filename, token.line, token.col,
"Expected '%s', found '%s'",
dmnsn_token_name(type),
dmnsn_token_name(token.type));
return 1;
}
} else {
fprintf(stderr, "Expected '%s', found end of file\n",
dmnsn_token_name(type));
return 1;
}
++*ip;
return 0;
}
static int
dmnsn_parse_float(const dmnsn_array *tokens, unsigned int *ip,
dmnsn_array *astree)
{
unsigned int i = *ip;
if (i >= dmnsn_array_size(tokens)) {
fprintf(stderr, "Expected '%s' or '%s', found end of file\n",
dmnsn_token_name(DMNSN_T_INTEGER),
dmnsn_token_name(DMNSN_T_FLOAT));
return 1;
}
int negative = 0;
dmnsn_token token;
dmnsn_array_get(tokens, i, &token);
if (token.type == DMNSN_T_MINUS) {
negative = 1;
++i;
if (i >= dmnsn_array_size(tokens)) {
fprintf(stderr, "Expected '%s' or '%s', found end of file\n",
dmnsn_token_name(DMNSN_T_INTEGER),
dmnsn_token_name(DMNSN_T_FLOAT));
return 1;
}
dmnsn_array_get(tokens, i, &token);
}
double *value = malloc(sizeof(double));
if (!value)
dmnsn_error(DMNSN_SEVERITY_HIGH, "Couldn't allocate room for float.");
if (token.type == DMNSN_T_INTEGER || token.type == DMNSN_T_FLOAT) {
*value = strtod(token.value, NULL);
++i;
} else {
fprintf(stderr, "Expected '%s' or '%s', found '%s'\n",
dmnsn_token_name(DMNSN_T_INTEGER),
dmnsn_token_name(DMNSN_T_FLOAT),
dmnsn_token_name(token.type));
return 1;
}
if (negative)
*value *= -1.0;
dmnsn_astnode astnode;
astnode.type = DMNSN_AST_FLOAT;
astnode.children = NULL;
astnode.ptr = value;
dmnsn_array_push(astree, &astnode);
*ip = i;
return 0;
}
static int
dmnsn_parse_vector(const dmnsn_array *tokens, unsigned int *ip,
dmnsn_array *astree)
{
unsigned int i = *ip;
if (dmnsn_parse_expect(DMNSN_T_LESS, tokens, &i) != 0)
return 1;
dmnsn_astnode astnode;
astnode.type = DMNSN_AST_VECTOR;
astnode.children = dmnsn_new_array(sizeof(dmnsn_astnode));
astnode.ptr = NULL;
/* First element */
if (dmnsn_parse_float(tokens, &i, astnode.children) != 0)
goto bailout;
if (dmnsn_parse_expect(DMNSN_T_COMMA, tokens, &i) != 0)
goto bailout;
/* Second element */
if (dmnsn_parse_float(tokens, &i, astnode.children) != 0)
goto bailout;
if (dmnsn_parse_expect(DMNSN_T_COMMA, tokens, &i) != 0)
goto bailout;
/* Third element */
if (dmnsn_parse_float(tokens, &i, astnode.children) != 0)
goto bailout;
if (dmnsn_parse_expect(DMNSN_T_GREATER, tokens, &i) != 0)
goto bailout;
dmnsn_array_push(astree, &astnode);
*ip = i;
return 0;
bailout:
dmnsn_delete_astree(astnode.children);
return 1;
}
static int
dmnsn_parse_box(const dmnsn_array *tokens, unsigned int *ip,
dmnsn_array *astree)
{
unsigned int i = *ip;
if (dmnsn_parse_expect(DMNSN_T_BOX, tokens, &i) != 0)
return 1;
if (dmnsn_parse_expect(DMNSN_T_LBRACE, tokens, &i) != 0)
return 1;
dmnsn_astnode astnode;
astnode.type = DMNSN_AST_BOX;
astnode.children = dmnsn_new_array(sizeof(dmnsn_astnode));
astnode.ptr = NULL;
/* First corner */
if (dmnsn_parse_vector(tokens, &i, astnode.children) != 0)
goto bailout;
if (dmnsn_parse_expect(DMNSN_T_COMMA, tokens, &i) != 0)
goto bailout;
/* Second corner */
if (dmnsn_parse_vector(tokens, &i, astnode.children) != 0)
goto bailout;
if (dmnsn_parse_expect(DMNSN_T_RBRACE, tokens, &i) != 0)
goto bailout;
dmnsn_array_push(astree, &astnode);
*ip = i;
return 0;
bailout:
dmnsn_delete_astree(astnode.children);
return 1;
}
dmnsn_array *
dmnsn_parse(const dmnsn_array *tokens)
{
unsigned int i;
dmnsn_array *astree = dmnsn_new_array(sizeof(dmnsn_astnode));
dmnsn_token token;
/* Save the current locale */
char *lc_ctype = strdup(setlocale(LC_CTYPE, NULL));
char *lc_numeric = strdup(setlocale(LC_NUMERIC, NULL));
/* Set the locale to `C' to make strtoul(), etc. consistent */
setlocale(LC_CTYPE, "C");
setlocale(LC_NUMERIC, "C");
for (i = 0; i < dmnsn_array_size(tokens); ++i) {
dmnsn_array_get(tokens, i, &token);
if (token.type == DMNSN_T_BOX) {
if (dmnsn_parse_box(tokens, &i, astree) != 0) {
dmnsn_diagnostic(token.filename, token.line, token.col,
"Invalid box",
dmnsn_token_name(DMNSN_T_BOX),
dmnsn_token_name(token.type));
goto bailout;
}
} else {
dmnsn_diagnostic(token.filename, token.line, token.col,
"Expected '%s', found '%s'",
dmnsn_token_name(DMNSN_T_BOX),
dmnsn_token_name(token.type));
goto bailout;
}
}
/* Restore the original locale */
setlocale(LC_CTYPE, lc_ctype);
setlocale(LC_NUMERIC, lc_numeric);
free(lc_ctype);
free(lc_numeric);
return astree;
bailout:
/* Restore the original locale */
setlocale(LC_CTYPE, lc_ctype);
setlocale(LC_NUMERIC, lc_numeric);
free(lc_ctype);
free(lc_numeric);
dmnsn_delete_astree(astree);
return NULL;
}
void
dmnsn_delete_astree(dmnsn_array *astree)
{
unsigned int i;
dmnsn_astnode node;
if (astree) {
for (i = 0; i < dmnsn_array_size(astree); ++i) {
dmnsn_array_get(astree, i, &node);
dmnsn_delete_astree(node.children);
free(node.ptr);
}
dmnsn_delete_array(astree);
}
}
void
dmnsn_print_astree_sexpr(FILE *file, const dmnsn_array *tokens)
{
}
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