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use std::borrow::Cow;
enum ParserState {
Text,
ColorCode,
Foreground1(char),
Foreground2,
Comma,
Background1(char),
}
struct Parser {
state: ParserState,
}
pub trait FormattedStringExt<'a> {
fn is_formatted(&self) -> bool;
fn strip_formatting(self) -> Cow<'a, str>;
}
const FORMAT_CHARACTERS: &[char] = &[
'\x02',
'\x1F',
'\x16',
'\x0F',
'\x03',
];
impl<'a> FormattedStringExt<'a> for &'a str {
fn is_formatted(&self) -> bool {
self.contains(FORMAT_CHARACTERS)
}
fn strip_formatting(self) -> Cow<'a, str> {
if !self.is_formatted() {
return Cow::Borrowed(self);
}
let mut s = String::from(self);
strip_formatting(&mut s);
Cow::Owned(s)
}
}
fn strip_formatting(buf: &mut String) {
let mut parser = Parser::new();
buf.retain(|cur| parser.next(cur));
}
impl Parser {
fn new() -> Self {
Parser {
state: ParserState::Text,
}
}
fn next(&mut self, cur: char) -> bool {
use self::ParserState::*;
match self.state {
Text | Foreground1(_) | Foreground2 if cur == '\x03' => {
self.state = ColorCode;
false
}
Text => !FORMAT_CHARACTERS.contains(&cur),
ColorCode if cur.is_digit(10) => {
self.state = Foreground1(cur);
false
}
Foreground1('1') if cur.is_digit(6) => {
self.state = Foreground2;
false
}
Foreground1(_) if cur.is_digit(6) => {
self.state = Text;
true
}
Foreground1(_) if cur == ',' => {
self.state = Comma;
false
}
Foreground2 if cur == ',' => {
self.state = Comma;
false
}
Comma if (cur.is_digit(10)) => {
self.state = Background1(cur);
false
}
Background1(prev) if cur.is_digit(6) => {
self.state = Text;
prev != '1'
}
_ => {
self.state = Text;
true
}
}
}
}
impl FormattedStringExt<'static> for String {
fn is_formatted(&self) -> bool {
self.as_str().is_formatted()
}
fn strip_formatting(mut self) -> Cow<'static, str> {
if !self.is_formatted() {
return Cow::Owned(self);
}
strip_formatting(&mut self);
Cow::Owned(self)
}
}
#[cfg(test)]
mod test {
use crate::colors::FormattedStringExt;
use std::borrow::Cow;
macro_rules! test_formatted_string_ext {
{ $( $name:ident ( $($line:tt)* ), )* } => {
$(
mod $name {
use super::*;
test_formatted_string_ext!(@ $($line)*);
}
)*
};
(@ $text:expr, should stripped into $expected:expr) => {
#[test]
fn test_formatted() {
assert!($text.is_formatted());
}
#[test]
fn test_strip() {
assert_eq!($text.strip_formatting(), $expected);
}
};
(@ $text:expr, is not formatted) => {
#[test]
fn test_formatted() {
assert!(!$text.is_formatted());
}
#[test]
fn test_strip() {
assert_eq!($text.strip_formatting(), $text);
}
}
}
test_formatted_string_ext! {
blank("", is not formatted),
blank2(" ", is not formatted),
blank3("\t\r\n", is not formatted),
bold("l\x02ol", should stripped into "lol"),
bold_from_string(String::from("l\x02ol"), should stripped into "lol"),
bold_hangul("우왕\x02굳", should stripped into "우왕굳"),
fg_color("l\x033ol", should stripped into "lol"),
fg_color2("l\x0312ol", should stripped into "lol"),
fg_bg_11("l\x031,2ol", should stripped into "lol"),
fg_bg_21("l\x0312,3ol", should stripped into "lol"),
fg_bg_12("l\x031,12ol", should stripped into "lol"),
fg_bg_22("l\x0312,13ol", should stripped into "lol"),
string_with_multiple_colors("hoo\x034r\x033a\x0312y", should stripped into "hooray"),
string_with_digit_after_color("\x0344\x0355\x0366", should stripped into "456"),
string_with_multiple_2digit_colors("hoo\x0310r\x0311a\x0312y", should stripped into "hooray"),
string_with_digit_after_2digit_color("\x031212\x031111\x031010", should stripped into "121110"),
thinking("🤔...", is not formatted),
unformatted("a plain text", is not formatted),
}
#[test]
fn test_strip_no_allocation_for_unformatted_text() {
if let Cow::Borrowed(formatted) = "plain text".strip_formatting() {
assert_eq!(formatted, "plain text");
} else {
panic!("allocation detected");
}
}
}