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use crate::doc::*;
fn normalize_add_element<S: Schema>(elem: AddElement<S>) -> AddElement<S> {
match elem {
AddGroup(attrs, span) => {
let span = normalize_add_span(span, false);
AddGroup(attrs, span)
}
AddWithGroup(span) => {
let span = normalize_add_span(span, true);
if span.is_empty() {
AddSkip(1)
} else {
AddWithGroup(span)
}
}
_ => elem,
}
}
fn normalize_add_span<S: Schema>(add: AddSpan<S>, trim_last: bool) -> AddSpan<S> {
let mut ret: AddSpan<S> = vec![];
for elem in add.into_iter() {
ret.place(&normalize_add_element(elem));
}
if trim_last {
if let Some(&AddSkip(..)) = ret.last() {
ret.pop();
}
}
ret
}
fn normalize_del_element<S: Schema>(elem: DelElement<S>) -> DelElement<S> {
match elem {
DelGroup(span) => {
let span = normalize_del_span(span, false);
DelGroup(span)
}
DelWithGroup(span) => {
let span = normalize_del_span(span, true);
if span.is_empty() {
DelSkip(1)
} else {
DelWithGroup(span)
}
}
_ => elem,
}
}
fn normalize_del_span<S: Schema>(del: DelSpan<S>, trim_last: bool) -> DelSpan<S> {
let mut ret: DelSpan<S> = vec![];
for elem in del.into_iter() {
ret.place(&normalize_del_element(elem));
}
if trim_last {
if let Some(&DelSkip(..)) = ret.last() {
ret.pop();
}
}
ret
}
pub fn normalize<S: Schema>(op: Op<S>) -> Op<S> {
Op(
normalize_del_span(op.0, true),
normalize_add_span(op.1, true),
)
}