/* Copyright (C) 2008 Artifex Software, Inc.
   All Rights Reserved.

   This software is provided AS-IS with no warranty, either express or
   implied.

   This software is distributed under license and may not be copied, modified
   or distributed except as expressly authorized under the terms of that
   license.  Refer to licensing information at http://www.artifex.com/
   or contact Artifex Software, Inc.,  7 Mt. Lassen  Drive - Suite A-134,
   San Rafael, CA  94903, U.S.A., +1(415)492-9861, for further information.
*/

/* SVG interpreter - data type parsing */

#include "ghostsvg.h"

int svg_is_whitespace_or_comma(int c)
{
     return (c == 0x20) || (c == 0x9) || (c == 0xD) || (c == 0xA) || (c == ',');
}

int svg_is_whitespace(int c)
{
    return (c == 0x20) || (c == 0x9) || (c == 0xD) || (c == 0xA);
}

int svg_is_alpha(int c)
{
    return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z');
}

int svg_is_digit(int c)
{
    return (c >= '0' && c <= '9') ||
        (c == 'e') || (c == 'E') ||
        (c == '+') || (c == '-') || (c == '.');
}

/* Return length/coordinate in points */
float
svg_parse_length(char *str, float percent, float font_size)
{
    char *end;
    float val;

    val = (float)strtod(str, &end);
    if (end == str)
        return 0; /* failed */

    if (!strcmp(end, "px")) return val;

    if (!strcmp(end, "pt")) return val * 1.0;
    if (!strcmp(end, "pc")) return val * 12.0;
    if (!strcmp(end, "mm")) return val * 2.83464567;
    if (!strcmp(end, "cm")) return val * 28.3464567;
    if (!strcmp(end, "in")) return val * 72.0;

    if (!strcmp(end, "em")) return val * font_size;
    if (!strcmp(end, "ex")) return val * font_size * 0.5;

    if (!strcmp(end, "%"))
        return val * percent * 0.01;

    if (end[0] == 0)
        return val;

    return 0;
}

/* Return angle in degrees */
float
svg_parse_angle(char *str)
{
    char *end;
    float val;

    val = (float)strtod(str, &end);
    if (end == str)
        return 0; /* failed */

    if (!strcmp(end, "deg"))
        return val;

    if (!strcmp(end, "grad"))
        return val * 0.9;

    if (!strcmp(end, "rad"))
        return val * 57.2957795;

    return val;
}