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" HTML folding script, :h ft-html-plugin
" Latest Change: 2025 May 10
" Original Author: Aliaksei Budavei <0x000c70@gmail.com>
function! htmlfold#MapBalancedTags() abort
" Describe only _a capturable-name prefix_ for start and end patterns of
" a tag so that start tags with attributes spanning across lines can also be
" matched with a single call of "getline()".
let tag = '\m\c</\=\([0-9A-Za-z-]\+\)'
let names = []
let pairs = []
let ends = []
let pos = getpos('.')
try
call cursor(1, 1)
let [lnum, cnum] = searchpos(tag, 'cnW')
" Pair up nearest non-inlined tags in scope.
while lnum > 0
let name_attr = synIDattr(synID(lnum, cnum, 0), 'name')
if name_attr ==# 'htmlTag' || name_attr ==# 'htmlScriptTag'
let name = get(matchlist(getline(lnum), tag, (cnum - 1)), 1, '')
if !empty(name)
call insert(names, tolower(name), 0)
call insert(pairs, [lnum, -1], 0)
endif
elseif name_attr ==# 'htmlEndTag'
let name = get(matchlist(getline(lnum), tag, (cnum - 1)), 1, '')
if !empty(name)
let idx = index(names, tolower(name))
if idx >= 0
" Dismiss inlined balanced tags and opened-only tags.
if pairs[idx][0] != lnum
let pairs[idx][1] = lnum
call add(ends, lnum)
endif
" Claim a pair.
let names[: idx] = repeat([''], (idx + 1))
endif
endif
endif
" Advance the cursor, at "<", past "</a", "<a>", etc.
call cursor(lnum, (cnum + 3))
let [lnum, cnum] = searchpos(tag, 'cnW')
endwhile
finally
call setpos('.', pos)
endtry
if empty(ends)
return {}
endif
let folds = {}
let pending_end = ends[0]
let level = 0
while !empty(pairs)
let [start, end] = remove(pairs, -1)
if end < 0
continue
endif
if start >= pending_end
" Mark a sibling tag.
call remove(ends, 0)
while start >= ends[0]
" Mark a parent tag.
call remove(ends, 0)
let level -= 1
endwhile
let pending_end = ends[0]
else
" Mark a child tag.
let level += 1
endif
" Flatten the innermost inlined folds.
let folds[start] = get(folds, start, ('>' . level))
let folds[end] = get(folds, end, ('<' . level))
endwhile
return folds
endfunction
" See ":help vim9-mix".
if !has("vim9script")
finish
endif
def! g:htmlfold#MapBalancedTags(): dict<string>
# Describe only _a capturable-name prefix_ for start and end patterns of
# a tag so that start tags with attributes spanning across lines can also be
# matched with a single call of "getline()".
const tag: string = '\m\c</\=\([0-9A-Za-z-]\+\)'
var names: list<string> = []
var pairs: list<list<number>> = []
var ends: list<number> = []
const pos: list<number> = getpos('.')
try
cursor(1, 1)
var [lnum: number, cnum: number] = searchpos(tag, 'cnW')
# Pair up nearest non-inlined tags in scope.
while lnum > 0
const name_attr: string = synIDattr(synID(lnum, cnum, 0), 'name')
if name_attr ==# 'htmlTag' || name_attr ==# 'htmlScriptTag'
const name: string = get(matchlist(getline(lnum), tag, (cnum - 1)), 1, '')
if !empty(name)
insert(names, tolower(name), 0)
insert(pairs, [lnum, -1], 0)
endif
elseif name_attr ==# 'htmlEndTag'
const name: string = get(matchlist(getline(lnum), tag, (cnum - 1)), 1, '')
if !empty(name)
const idx: number = index(names, tolower(name))
if idx >= 0
# Dismiss inlined balanced tags and opened-only tags.
if pairs[idx][0] != lnum
pairs[idx][1] = lnum
add(ends, lnum)
endif
# Claim a pair.
names[: idx] = repeat([''], (idx + 1))
endif
endif
endif
# Advance the cursor, at "<", past "</a", "<a>", etc.
cursor(lnum, (cnum + 3))
[lnum, cnum] = searchpos(tag, 'cnW')
endwhile
finally
setpos('.', pos)
endtry
if empty(ends)
return {}
endif
var folds: dict<string> = {}
var pending_end: number = ends[0]
var level: number = 0
while !empty(pairs)
const [start: number, end: number] = remove(pairs, -1)
if end < 0
continue
endif
if start >= pending_end
# Mark a sibling tag.
remove(ends, 0)
while start >= ends[0]
# Mark a parent tag.
remove(ends, 0)
level -= 1
endwhile
pending_end = ends[0]
else
# Mark a child tag.
level += 1
endif
# Flatten the innermost inlined folds.
folds[start] = get(folds, start, ('>' .. level))
folds[end] = get(folds, end, ('<' .. level))
endwhile
return folds
enddef
" vim: fdm=syntax sw=2 ts=8 noet
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