parse_gml_double()

static double parse_gml_double ( char *  d, bool  space_before, bool  space_after  )

static

Parse a string supposed to be a double.

Definition at line 448 of file lwgeom_in_gml.c.

References gml_lwpgerror().

Referenced by parse_gml_coord(), parse_gml_coordinates(), parse_gml_pos(), and parse_gml_poslist().

{
        char *p;
        int st;
        enum states
        {
                INIT            = 0,
                NEED_DIG        = 1,
                DIG             = 2,
                NEED_DIG_DEC    = 3,
                DIG_DEC         = 4,
                EXP             = 5,
                NEED_DIG_EXP    = 6,
                DIG_EXP         = 7,
                END             = 8
        };

        /*
         * Double pattern
         * [-|\+]?[0-9]+(\.)?([0-9]+)?([Ee](\+|-)?[0-9]+)?
         * We could also meet spaces before and/or after
         * this pattern upon parameters
         */

        if (space_before) while (isspace(*d)) d++;
        for (st = INIT, p = d ; *p ; p++)
        {

                if (isdigit(*p))
                {
                        if (st == INIT || st == NEED_DIG)               st = DIG;
                        else if (st == NEED_DIG_DEC)                    st = DIG_DEC;
                        else if (st == NEED_DIG_EXP || st == EXP)       st = DIG_EXP;
                        else if (st == DIG || st == DIG_DEC || st == DIG_EXP);
                        else gml_lwpgerror("invalid GML representation", 7);
                }
                else if (*p == '.')
                {
                        if      (st == DIG)                             st = NEED_DIG_DEC;
                        else    gml_lwpgerror("invalid GML representation", 8);
                }
                else if (*p == '-' || *p == '+')
                {
                        if      (st == INIT)                            st = NEED_DIG;
                        else if (st == EXP)                             st = NEED_DIG_EXP;
                        else    gml_lwpgerror("invalid GML representation", 9);
                }
                else if (*p == 'e' || *p == 'E')
                {
                        if      (st == DIG || st == DIG_DEC)            st = EXP;
                        else    gml_lwpgerror("invalid GML representation", 10);
                }
                else if (isspace(*p))
                {
                        if (!space_after) gml_lwpgerror("invalid GML representation", 11);
                        if (st == DIG || st == DIG_DEC || st == DIG_EXP)st = END;
                        else if (st == NEED_DIG_DEC)                    st = END;
                        else if (st == END);
                        else    gml_lwpgerror("invalid GML representation", 12);
                }
                else  gml_lwpgerror("invalid GML representation", 13);
        }

        if (st != DIG && st != NEED_DIG_DEC && st != DIG_DEC && st != DIG_EXP && st != END)
                gml_lwpgerror("invalid GML representation", 14);

        return atof(d);
}

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