stdlib_ascii Module
The stdlib_ascii module provides procedures for handling and manipulating
intrinsic character variables and constants.
The specification of this module is available here.
Uses
Variables
| Type | Visibility | Attributes | Name | Initial | |||
|---|---|---|---|---|---|---|---|
| character(len=1), | public, | parameter | :: | ACK | = | achar(int(z'06')) |
Acknowledge |
| character(len=1), | public, | parameter | :: | BEL | = | achar(int(z'07')) |
Bell |
| character(len=1), | public, | parameter | :: | BS | = | achar(int(z'08')) |
Backspace |
| character(len=1), | public, | parameter | :: | CAN | = | achar(int(z'18')) |
Cancel |
| character(len=1), | public, | parameter | :: | CR | = | achar(int(z'0D')) |
Carriage return |
| character(len=1), | public, | parameter | :: | DC1 | = | achar(int(z'11')) |
Device control 1 |
| character(len=1), | public, | parameter | :: | DC2 | = | achar(int(z'12')) |
Device control 2 |
| character(len=1), | public, | parameter | :: | DC3 | = | achar(int(z'13')) |
Device control 3 |
| character(len=1), | public, | parameter | :: | DC4 | = | achar(int(z'14')) |
Device control 4 |
| character(len=1), | public, | parameter | :: | DEL | = | achar(int(z'7F')) |
Delete |
| character(len=1), | public, | parameter | :: | DLE | = | achar(int(z'10')) |
Data link escape |
| character(len=1), | public, | parameter | :: | EM | = | achar(int(z'19')) |
End of medium |
| character(len=1), | public, | parameter | :: | ENQ | = | achar(int(z'05')) |
Enquiry |
| character(len=1), | public, | parameter | :: | EOT | = | achar(int(z'04')) |
End of transmission |
| character(len=1), | public, | parameter | :: | ESC | = | achar(int(z'1B')) |
Escape |
| character(len=1), | public, | parameter | :: | ETB | = | achar(int(z'17')) |
End of transmission block |
| character(len=1), | public, | parameter | :: | ETX | = | achar(int(z'03')) |
End of text |
| character(len=1), | public, | parameter | :: | FF | = | achar(int(z'0C')) |
NP form feed, new page |
| character(len=1), | public, | parameter | :: | FS | = | achar(int(z'1C')) |
File separator |
| character(len=1), | public, | parameter | :: | GS | = | achar(int(z'1D')) |
Group separator |
| character(len=1), | public, | parameter | :: | LF | = | achar(int(z'0A')) |
NL line feed, new line |
| character(len=1), | public, | parameter | :: | NAK | = | achar(int(z'15')) |
Negative acknowledge |
| character(len=1), | public, | parameter | :: | NUL | = | achar(int(z'00')) |
Null |
| character(len=1), | public, | parameter | :: | RS | = | achar(int(z'1E')) |
Record separator |
| character(len=1), | public, | parameter | :: | SI | = | achar(int(z'0F')) |
Shift in |
| character(len=1), | public, | parameter | :: | SO | = | achar(int(z'0E')) |
Shift out |
| character(len=1), | public, | parameter | :: | SOH | = | achar(int(z'01')) |
Start of heading |
| character(len=1), | public, | parameter | :: | STX | = | achar(int(z'02')) |
Start of text |
| character(len=1), | public, | parameter | :: | SUB | = | achar(int(z'1A')) |
Substitute |
| character(len=1), | public, | parameter | :: | SYN | = | achar(int(z'16')) |
Synchronous idle |
| character(len=1), | public, | parameter | :: | TAB | = | achar(int(z'09')) |
Horizontal tab |
| character(len=1), | public, | parameter | :: | US | = | achar(int(z'1F')) |
Unit separator |
| character(len=1), | public, | parameter | :: | VT | = | achar(int(z'0B')) |
Vertical tab |
| character(len=*), | public, | parameter | :: | digits | = | hex_digits(1:10) |
0 .. 9 |
| character(len=*), | public, | parameter | :: | fullhex_digits | = | "0123456789ABCDEFabcdef" |
0 .. 9A .. Fa .. f |
| character(len=*), | public, | parameter | :: | hex_digits | = | fullhex_digits(1:16) |
0 .. 9A .. F |
| character(len=*), | public, | parameter | :: | letters | = | "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz" |
A .. Za .. z |
| character(len=*), | public, | parameter | :: | lowercase | = | letters(27:) |
a .. z |
| character(len=*), | public, | parameter | :: | lowerhex_digits | = | "0123456789abcdef" |
0 .. 9a .. f |
| character(len=*), | public, | parameter | :: | octal_digits | = | digits(1:8) |
0 .. 7 |
| character(len=*), | public, | parameter | :: | uppercase | = | letters(1:26) |
A .. Z |
| character(len=*), | public, | parameter | :: | whitespace | = | " "//TAB//VT//CR//LF//FF |
ASCII _whitespace |
Functions
public pure function is_alpha(c)
Checks whether c is an ASCII letter (A .. Z, a .. z).
Arguments
| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| character(len=1), | intent(in) | :: | c |
The character to test. |
Return Value logical
public pure function is_alphanum(c)
Checks whether c is a letter or a number (0 .. 9, a .. z, A .. Z).
Arguments
| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| character(len=1), | intent(in) | :: | c |
The character to test. |
Return Value logical
public pure function is_ascii(c)
Checks whether or not c is in the ASCII character set -
i.e. in the range 0 .. 0x7F.
Arguments
| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| character(len=1), | intent(in) | :: | c |
The character to test. |
Return Value logical
public pure function is_blank(c)
Checks whether or not c is a blank character. That includes the
only the space and tab characters
Arguments
| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| character(len=1), | intent(in) | :: | c |
The character to test. |
Return Value logical
public pure function is_control(c)
Checks whether c is a control character.
Arguments
| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| character(len=1), | intent(in) | :: | c |
The character to test. |
Return Value logical
public pure function is_digit(c)
Checks whether c is a digit (0 .. 9).
Arguments
| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| character(len=1), | intent(in) | :: | c |
The character to test. |
Return Value logical
public pure function is_graphical(c)
Checks whether or not c is a printable character other than the
space character.
Arguments
| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| character(len=1), | intent(in) | :: | c |
The character to test. |
Return Value logical
public pure function is_hex_digit(c)
Checks whether c is a digit in base 16 (0 .. 9, A .. F, a .. f).
Arguments
| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| character(len=1), | intent(in) | :: | c |
The character to test. |
Return Value logical
public pure function is_lower(c)
Checks whether c is a lowercase ASCII letter (a .. z).
Arguments
| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| character(len=1), | intent(in) | :: | c |
The character to test. |
Return Value logical
public pure function is_octal_digit(c)
Checks whether c is a digit in base 8 (0 .. 7).
Arguments
| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| character(len=1), | intent(in) | :: | c |
The character to test. |
Return Value logical
public pure function is_printable(c)
Checks whether or not c is a printable character - including the
space character.
Arguments
| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| character(len=1), | intent(in) | :: | c |
The character to test. |
Return Value logical
public pure function is_punctuation(c)
Checks whether or not c is a punctuation character. That includes
all ASCII characters which are not control characters, letters,
digits, or whitespace.
Arguments
| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| character(len=1), | intent(in) | :: | c |
The character to test. |
Return Value logical
public pure function is_upper(c)
Checks whether c is an uppercase ASCII letter (A .. Z).
Arguments
| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| character(len=1), | intent(in) | :: | c |
The character to test. |
Return Value logical
public pure function is_white(c)
Checks whether or not c is a whitespace character. That includes the
space, tab, vertical tab, form feed, carriage return, and linefeed
characters.
Arguments
| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| character(len=1), | intent(in) | :: | c |
The character to test. |
Return Value logical
public pure function reverse(string) result(reverse_string)
Reverse the character order in the input character variable (Specification)
Arguments
| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| character(len=*), | intent(in) | :: | string |
Return Value character(len=len)
public pure function to_lower(string) result(lower_string)
Convert character variable to lower case (Specification)
Arguments
| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| character(len=*), | intent(in) | :: | string |
Return Value character(len=len)
public pure function to_sentence(string) result(sentence_string)
Converts character sequence to sentence case (Specification)
Arguments
| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| character(len=*), | intent(in) | :: | string |
Return Value character(len=len)
public pure function to_title(string) result(title_string)
Converts character sequence to title case (Specification)
Arguments
| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| character(len=*), | intent(in) | :: | string |
Return Value character(len=len)
public pure function to_upper(string) result(upper_string)
Convert character variable to upper case (Specification)
Arguments
| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| character(len=*), | intent(in) | :: | string |