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/*
ppedit - A pattern plate editor for Spiro splines.
Copyright (C) 2007 Raph Levien
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.
*/
#include <stdio.h>
#include <math.h>
#include "sexp.h"
/* This is handcoded to avoid locale problems. */
static int
parse_double(sexp_reader *sr)
{
double sign = 1.0, val = 0.0;
int i;
int numstart;
const char * const b = sr->tokbuf;
int is_double = 1;
i = 0;
if (b[i] == '+') {
i++;
} else if (b[i] == '-') {
sign = -1.0;
i++;
}
numstart = i;
while (b[i] >= '0' && b[i] <= '9')
val = val * 10.0 + b[i++] - '0';
if (b[i] == '.') {
double frac = 1.0;
for (i++; b[i] >= '0' && b[i] <= '9'; i++) {
frac *= 0.1;
val += (b[i] - '0') * frac;
}
/* A '.' without any digits on either side isn't valid. */
if (i == numstart + 1)
is_double = 0;
}
if (b[i] == 'e' || b[i] == 'E') {
int expsign = 1, exp = 0;
int expstart;
if (b[i] == '+') {
i++;
} else if (b[i] == '-') {
expsign = -1;
i++;
}
expstart = i;
while (b[i] >= '0' && b[i] <= '9')
exp = exp * 10 + b[i++] - '0';
if (i == expstart)
is_double = 0;
val *= pow(10.0, expsign * exp);
}
val *= sign;
sr->d = val;
if (b[i] != 0) is_double = 0;
sr->is_double = is_double;
return is_double;
}
/* Return values: 0 = EOF, 1 = token but not double, 2 = valid double */
int
sexp_token(sexp_reader *sr)
{
int c;
int i;
sr->singlechar = -1;
if (sr->f == NULL)
return 0;
for (;;) {
c = getc(sr->f);
if (c == EOF) {
sr->f = NULL;
return 0;
} else if (c == '#') {
do {
c = getc(sr->f);
} while (c != EOF && c != '\r' && c != '\n');
} else if (c != ' ' && c != '\r' && c != '\n' && c != '\t')
break;
}
sr->tokbuf[0] = c;
i = 1;
if (c != '(' && c != ')') {
for (;;) {
c = getc(sr->f);
if (c == EOF) {
sr->f = NULL;
break;
} else if (c == ' ' || c == '\r' || c == '\n' || c == '\t') {
break;
} else if (c == '(' || c == ')' || c == '#') {
ungetc(c, sr->f);
break;
} else if (i < sizeof(sr->tokbuf) - 1)
sr->tokbuf[i++] = c;
}
}
sr->tokbuf[i] = 0;
if (i == 1)
sr->singlechar = sr->tokbuf[0];
return 1 + parse_double(sr);
}
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