1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221
|
/*
* ctype routines
* Bart 2002/7
* ASCII-only: Nickle is in the C locale
*/
namespace Ctype {
public bool isascii(int ch)
/*
* As with C ctype.h, things outside the ASCII range
* are not handled here. Unlike C ctype.h, we handle
* this case cleanly.
*/
{
return ch >= 0 && ch <= 127;
}
/* The characteristic vector of sets of Latin-1 chars. */
public typedef bool[256] charset;
public charset make_charset(bool(int) cfun)
/*
* Make a characteristic vector from a characteristic function.
*/
{
charset result;
for (int i = 0; i < dim(result); i++)
result[i] = cfun(i);
return result;
}
public bool member(charset v, int ch)
/*
* Test whether a particular char is in a charset.
*/
{
return ch >= 0 && ch < dim(v) && v[ch];
}
/*
* Now this machinery is used to implement the standard
* C ctype.h tests in the obvious fasion.
*/
public bool isupper(int ch)
/*
* Return whether 'ch' is uppercase.
*/
{
static bool cfun(int ch) {
return (ch >= 'A' && ch <= 'Z' ||
ch >= 'À' && ch <= 'Þ');
}
static charset v = make_charset(cfun);
return member(v, ch);
}
public bool islower(int ch)
/*
* Return whether 'ch' is lowercase.
*/
{
static bool cfun(int ch) {
return (ch >= 'a' && ch <= 'z' ||
ch >= 'à' && ch <= 'þ');
}
static charset v = make_charset(cfun);
return member(v, ch);
}
public bool isdigit(int ch)
/*
* Return whether 'ch' is a digit
*/
{
static bool cfun(int ch) {
return ch >= '0' && ch <= '9';
}
static charset v = make_charset(cfun);
return member(v, ch);
}
public bool isblank(int ch)
/*
* Return whether 'ch' is a space or tab
*/
{
return ch == ' ' || ch == '\t';
}
public bool iscntrl(int ch)
/*
* Return whether 'ch' is a control character
*/
{
static bool cfun(int ch) {
return ch >= 0 && ch <= 31;
}
static charset v = make_charset(cfun);
return member(v, ch);
}
public bool isgraph(int ch)
/*
* Return whether 'ch' is a visible character
*/
{
static bool cfun(int ch) {
return (ch > ' ' && ch < 127 ||
ch >= 'À' && ch <= 'þ');
}
static charset v = make_charset(cfun);
return member(v, ch);
}
public bool isprint(int ch)
/*
* Return whether 'ch' is a printable character
*/
{
static bool cfun(int ch) {
return (ch >= ' ' && ch < 127 ||
ch >= 'À' && ch <= 'þ');
}
static charset v = make_charset(cfun);
return member(v, ch);
}
public bool isspace(int ch)
/*
* Return whether 'ch' is whitespace
*/
{
static bool cfun(int ch) {
int[*] sc = {' ', '\f', '\n', '\r', '\t', '\v'};
for (int i = 0; i < dim(sc); i++)
if (ch == sc[i])
return true;
return false;
}
static charset v = make_charset(cfun);
return member(v, ch);
}
public bool isalpha(int ch)
/*
* Return whether 'ch' is a latin letter
*/
{
static bool cfun(int ch) {
return islower(ch) || isupper(ch);
}
static charset v = make_charset(cfun);
return member(v, ch);
}
public bool isalnum(int ch)
/*
* Return whether 'ch' is a letter or digit
*/
{
static bool cfun(int ch) {
return isalpha(ch) || isdigit(ch);
}
static charset v = make_charset(cfun);
return member(v, ch);
}
public bool ispunct(int ch)
/*
* Return whether 'ch' is punctuation
*/
{
static bool cfun(int ch) {
return isgraph(ch) && !isalnum(ch);
}
static charset v = make_charset(cfun);
return member(v, ch);
}
public int tolower(int ch)
/*
* If 'ch' is upper case, return the lower case version
* else return 'ch'
*/
{
if (isupper(ch))
return ch - 'A' + 'a';
return ch;
}
public int toupper(int ch)
/*
* If 'ch' is lower case, return the upper case version
* else return 'ch'
*/
{
if (islower(ch))
return ch - 'a' + 'A';
return ch;
}
public bool isxdigit(int ch)
/*
* Return whether 'ch' is a hexidecimal digit
*/
{
static bool cfun(int ch) {
if (isdigit(ch))
return true;
int chl = tolower(ch);
return chl >= 'a' && chl <= 'f';
}
static charset v = make_charset(cfun);
return member(v, ch);
}
}
|