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/* -*- c++ -*- */
/*
* Copyright © 2010 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <assert.h>
#include "s_expression.h"
s_symbol::s_symbol(const char *tmp)
{
this->str = new char [strlen(tmp) + 1];
strcpy(this->str, tmp);
}
s_list::s_list()
{
}
unsigned
s_list::length() const
{
unsigned i = 0;
foreach_iter(exec_list_iterator, it, this->subexpressions) {
i++;
}
return i;
}
static s_expression *
read_atom(const char *& src)
{
char buf[101];
int n;
if (sscanf(src, " %100[^( \v\t\r\n)]%n", buf, &n) != 1)
return NULL; // no atom
src += n;
// Check if the atom is a number.
char *float_end = NULL;
double f = strtod(buf, &float_end);
if (float_end != buf) {
char *int_end = NULL;
int i = strtol(buf, &int_end, 10);
// If strtod matched more characters, it must have a decimal part
if (float_end > int_end)
return new s_float(f);
return new s_int(i);
}
// Not a number; return a symbol.
return new s_symbol(buf);
}
s_expression *
s_expression::read_expression(const char *&src)
{
assert(src != NULL);
s_expression *atom = read_atom(src);
if (atom != NULL)
return atom;
char c;
int n;
if (sscanf(src, " %c%n", &c, &n) == 1 && c == '(') {
src += n;
s_list *list = new s_list;
s_expression *expr;
while ((expr = read_expression(src)) != NULL) {
list->subexpressions.push_tail(expr);
}
if (sscanf(src, " %c%n", &c, &n) != 1 || c != ')') {
printf("Unclosed expression (check your parenthesis).\n");
return NULL;
}
src += n;
return list;
}
return NULL;
}
void s_int::print()
{
printf("%d", this->val);
}
void s_float::print()
{
printf("%f", this->val);
}
void s_symbol::print()
{
printf("%s", this->str);
}
void s_list::print()
{
printf("(");
foreach_iter(exec_list_iterator, it, this->subexpressions) {
s_expression *expr = (s_expression*) it.get();
expr->print();
printf(" ");
}
printf(")");
}
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