Module coil-stdlib

`ascii`

Functions here take and return byte. Bytes outside ASCII are never letters or digits, and case conversion leaves them unchanged. For whole strings, see text.

Part of coil-stdlib. spool projects get it automatically; with plain coil, pass --root ~/.coil/stdlib/src.

Import what you use (use path::* is not allowed):

use ascii::{is_space, is_digit};

Functions#

Name	Description
`is_space`	True for ASCII space, tab, line feed, or carriage return.
`is_digit`	True for an ASCII decimal digit (`0` through `9`).
`is_hex`	True for an ASCII hex digit (`0`-`9`, `a`-`f`, `A`-`F`).
`is_alpha`	True for an ASCII letter (`A` through `Z` or `a` through `z`).
`is_alnum`	True for an ASCII alphanumeric byte.
`is_print`	True for an ASCII printable byte (space through tilde).
`is_ctrl`	True for an ASCII control byte (below space, excluding DEL).
`to_lower`	ASCII lower-case for `A`..=`Z`; other bytes unchanged.
`to_upper`	ASCII upper-case for `a`..=`z`; other bytes unchanged.
`digit_val`	Numeric value of an ASCII decimal digit, or `-1` for another byte.
`hex_val`	Numeric value of an ASCII hex digit, or `-1` for another byte.
`hex_digit`	Lowercase hex digit for `0..=15`.
`digit_char`	Decimal digit as a one-byte string.