60 lines
2.1 KiB
Rust
60 lines
2.1 KiB
Rust
/* lexer/src/named_char.rs
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* Eryn Wells <eryn@erynwells.me>
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*/
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use std::collections::HashMap;
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use std::sync::{Once, ONCE_INIT};
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const ALARM: &'static str = "alarm";
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const BACKSPACE: &'static str = "backspace";
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const DELETE: &'static str = "delete";
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const ESCAPE: &'static str = "escape";
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const NEWLINE: &'static str = "newline";
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const NULL: &'static str = "null";
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const RETURN: &'static str = "return";
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const SPACE: &'static str = "space";
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const TAB: &'static str = "tab";
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/// Mapping of names to `char` values. Returns the name of the given character, if a name exists.
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/// Otherwise, returns `None`.
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fn char_for(named: &str) -> Option<char> {
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static ONCE = ONCE_INIT;
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static mut names_to_chars: HashMap<&'static str, char>;
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unsafe {
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ONCE.call_once(|| {
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names_to_chars = HashMap::new();
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names_to_chars.insert(ALARM, '\x07');
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names_to_chars.insert(BACKSPACE, '\x08');
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names_to_chars.insert(DELETE, '\x7F');
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names_to_chars.insert(ESCAPE, '\x1B');
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names_to_chars.insert(NEWLINE, '\n');
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names_to_chars.insert(NULL, '\0');
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names_to_chars.insert(RETURN, '\r');
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names_to_chars.insert(SPACE, ' ');
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names_to_chars.insert(TAB, '\t');
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});
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names_to_chars.get(named)
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}
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}
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/// Mapping of `char` values to names. Returns the name of the given character, if a name exists.
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/// Otherwise, returns `None`.
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fn name_of(c: char) -> Option<&'static str> {
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static ONCE = ONCE_INIT;
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static mut chars_to_names: HashMap<char, &'static str>;
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unsafe {
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ONCE.call_once(|| {
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chars_to_names = HashMap::new();
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chars_to_names.insert('\x07', ALARM);
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chars_to_names.insert('\x08', BACKSPACE);
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chars_to_names.insert('\x7F', DELETE);
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chars_to_names.insert('\x1B', ESCAPE);
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chars_to_names.insert('\n', NEWLINE);
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chars_to_names.insert('\0', NULL);
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chars_to_names.insert('\r', RETURN);
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chars_to_names.insert(' ', SPACE);
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chars_to_names.insert('\t', TAB);
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});
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chars_to_names.get(c)
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}
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}
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