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/*
* 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);
}
}
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