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use std::fmt;
use std::ops;
#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct TextUnit(u32);
impl TextUnit {
pub fn len_of_char(c: char) -> TextUnit {
TextUnit(c.len_utf8() as u32)
}
pub fn new(val: u32) -> TextUnit {
TextUnit(val)
}
}
impl fmt::Debug for TextUnit {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
<Self as fmt::Display>::fmt(self, f)
}
}
impl fmt::Display for TextUnit {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
self.0.fmt(f)
}
}
impl From<TextUnit> for u32 {
fn from(tu: TextUnit) -> u32 {
tu.0
}
}
impl From<u32> for TextUnit {
fn from(tu: u32) -> TextUnit {
TextUnit::new(tu)
}
}
impl ops::Add<TextUnit> for TextUnit {
type Output = TextUnit;
fn add(self, rhs: TextUnit) -> TextUnit {
TextUnit(self.0 + rhs.0)
}
}
impl ops::AddAssign<TextUnit> for TextUnit {
fn add_assign(&mut self, rhs: TextUnit) {
self.0 += rhs.0
}
}
impl ops::Sub<TextUnit> for TextUnit {
type Output = TextUnit;
fn sub(self, rhs: TextUnit) -> TextUnit {
TextUnit(self.0 - rhs.0)
}
}
impl ops::SubAssign<TextUnit> for TextUnit {
fn sub_assign(&mut self, rhs: TextUnit) {
self.0 -= rhs.0
}
}
#[derive(Clone, Copy, PartialEq, Eq)]
pub struct TextRange {
start: TextUnit,
end: TextUnit,
}
impl fmt::Debug for TextRange {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
<Self as fmt::Display>::fmt(self, f)
}
}
impl fmt::Display for TextRange {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "[{}; {})", self.start(), self.end())
}
}
impl TextRange {
pub fn empty() -> TextRange {
TextRange::from_to(TextUnit::new(0), TextUnit::new(0))
}
pub fn from_to(from: TextUnit, to: TextUnit) -> TextRange {
assert!(from <= to, "Invalid text range [{}; {})", from, to);
TextRange { start: from, end: to }
}
pub fn from_len(from: TextUnit, len: TextUnit) -> TextRange {
TextRange::from_to(from, from + len)
}
pub fn start(&self) -> TextUnit {
self.start
}
pub fn end(&self) -> TextUnit {
self.end
}
pub fn len(&self) -> TextUnit {
self.end - self.start
}
pub fn is_empty(&self) -> bool {
self.start() == self.end()
}
}
impl ops::Index<TextRange> for str {
type Output = str;
fn index(&self, index: TextRange) -> &str {
&self[index.start().0 as usize..index.end().0 as usize]
}
}
|
