use std::fmt;
use std::ops;
+/// An text position in a source file
#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct TextUnit(u32);
impl TextUnit {
+ /// The positional offset required for one character
pub fn len_of_char(c: char) -> TextUnit {
TextUnit(c.len_utf8() as u32)
}
+ #[allow(missing_docs)]
pub fn new(val: u32) -> TextUnit {
TextUnit(val)
}
}
}
+/// A range of text in a source file
#[derive(Clone, Copy, PartialEq, Eq)]
pub struct TextRange {
start: TextUnit,
}
impl TextRange {
+ /// An length-0 range of text
pub fn empty() -> TextRange {
TextRange::from_to(TextUnit::new(0), TextUnit::new(0))
}
+ /// The left-inclusive range (`[from..to)`) between to points in the text
pub fn from_to(from: TextUnit, to: TextUnit) -> TextRange {
assert!(from <= to, "Invalid text range [{}; {})", from, to);
TextRange {
}
}
+ /// The range from some point over some length
pub fn from_len(from: TextUnit, len: TextUnit) -> TextRange {
TextRange::from_to(from, from + len)
}
+ /// The starting position of this range
pub fn start(&self) -> TextUnit {
self.start
}
+ /// The end position of this range
pub fn end(&self) -> TextUnit {
self.end
}
+ /// The length of this range
pub fn len(&self) -> TextUnit {
self.end - self.start
}
+ /// Is this range empty of any content?
pub fn is_empty(&self) -> bool {
self.start() == self.end()
}