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Documentation for the set functions in characters.rs

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Eryn Wells 2016-12-22 09:24:53 -08:00
parent fbf1d07e27
commit 93353f0f9e
1 changed files with 5 additions and 0 deletions
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5
src/characters.rs
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@ -7,6 +7,9 @@ use std::iter::FromIterator;
pub type CharSet = HashSet<char>; pub type CharSet = HashSet<char>;
// TODO: Use std::sync::Once for these sets?
// https://doc.rust-lang.org/beta/std/sync/struct.Once.html
fn ascii_letters() -> CharSet { fn ascii_letters() -> CharSet {
let letters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ".chars(); let letters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ".chars();
CharSet::from_iter(letters) CharSet::from_iter(letters)
@ -17,6 +20,7 @@ fn ascii_digits() -> CharSet {
CharSet::from_iter(digits) CharSet::from_iter(digits)
} }
/// A set of all characters allowed to start Scheme identifiers.
pub fn identifier_initials() -> CharSet { pub fn identifier_initials() -> CharSet {
let letters = ascii_letters(); let letters = ascii_letters();
let extras = CharSet::from_iter("!$%&*/:<=>?~_^".chars()); let extras = CharSet::from_iter("!$%&*/:<=>?~_^".chars());
@ -26,6 +30,7 @@ pub fn identifier_initials() -> CharSet {
initials initials
} }
/// A set of all characters allowed to follow an identifier initial.
pub fn identifier_subsequents() -> CharSet { pub fn identifier_subsequents() -> CharSet {
let initials = identifier_initials(); let initials = identifier_initials();
let digits = ascii_digits(); let digits = ascii_digits();