9.8 Character

The members of the domain Character are values representing letters, numerals and other text elements. For more information on related topics, see CharacterClassXmpPage and StringXmpPage .

Characters can be obtained using String notation.

chars := [char "a", char "A", char "X", char "8", char "+"]

\[\]

[a,A,X,8,+]

_{Type: List Character}

Certain characters are available by name. This is the blank character.

space()

\[\]

_{Type: Character}

This is the quote that is used in strings.

quote()

\[\]

“

_{Type: Character}

This is the escape character that allows quotes and other characters within strings.

escape()

\[\]

_{Type: Character}

Characters are represented as integers in a machine-dependent way. The integer value can be obtained using the ordordCharacter operation. It is always true that char(ord c) = c and ord(char i) = i, provided that i is in the range 0..size()$Character-1.

[ord c for c in chars]

\[\]

[97,65,88,56,43]

_{Type: List Integer}

The lowerCaselowerCaseCharacter operation converts an upper case letter to the corresponding lower case letter. If the argument is not an upper case letter, then it is returned unchanged.

[upperCase c for c in chars]

\[\]

[A,A,X,8,+]

_{Type: List Character}

Likewise, the upperCaseupperCaseCharacter operation converts lower case letters to upper case.

[lowerCase c for c in chars]

\[\]

[a,a,x,8,+]

_{Type: List Character}

A number of tests are available to determine whether characters belong to certain families.

[alphabetic? c for c in chars]

\[\]

[true,true,true,false,false]

_{Type: List Boolean}

[upperCase? c for c in chars]

\[\]

[false,true,true,false,false]

_{Type: List Boolean}

[lowerCase? c for c in chars]

\[\]

[true,false,false,false,false]

_{Type: List Boolean}

[digit? c for c in chars]

\[\]

[false,false,false,true,false]

_{Type: List Boolean}

[hexDigit? c for c in chars]

\[\]

[true,true,false,true,false]

_{Type: List Boolean}

[alphanumeric? c for c in chars]

\[\]

[true,true,true,true,false]

_{Type: List Boolean}