minify-html/src/proc/range.rs at v0.3.0 · songlinshu/minify-html

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use crate::err::ProcessingResult;

use crate::ErrorType;

use crate::proc::Processor;

#[derive(Copy, Clone)]

pub struct ProcessorRange {

pub(super) start: usize,

pub(super) end: usize,

}

impl ProcessorRange {

pub fn len(&self) -> usize {

self.end - self.start

}

pub fn empty(&self) -> bool {

self.start >= self.end

}

pub fn nonempty(&self) -> bool {

!self.empty()

}

pub fn first(&self, proc: &Processor) -> Option<u8> {

if self.empty() {

None

} else {

Some(proc.code[self.start])

}

pub fn require(&self, reason: &'static str) -> ProcessingResult<Self> {

if self.empty() {

Err(ErrorType::NotFound(reason))

} else {

Ok(*self)

}

pub fn expect(&self) -> () {

debug_assert!(self.nonempty());

}