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// fences (``` lang, ~~~ lang)
export default function fence (state, startLine, endLine, silent) {
let pos = state.bMarks[startLine] + state.tShift[startLine]
let max = state.eMarks[startLine]
// if it's indented more than 3 spaces, it should be a code block
if (state.sCount[startLine] - state.blkIndent >= 4) { return false }
if (pos + 3 > max) { return false }
const marker = state.src.charCodeAt(pos)
if (marker !== 0x7E/* ~ */ && marker !== 0x60 /* ` */) {
return false
}
// scan marker length
let mem = pos
pos = state.skipChars(pos, marker)
let len = pos - mem
if (len < 3) { return false }
const markup = state.src.slice(mem, pos)
const params = state.src.slice(pos, max)
if (marker === 0x60 /* ` */) {
if (params.indexOf(String.fromCharCode(marker)) >= 0) {
return false
}
}
// Since start is found, we can report success here in validation mode
if (silent) { return true }
// search end of block
let nextLine = startLine
let haveEndMarker = false
for (;;) {
nextLine++
if (nextLine >= endLine) {
// unclosed block should be autoclosed by end of document.
// also block seems to be autoclosed by end of parent
break
}
pos = mem = state.bMarks[nextLine] + state.tShift[nextLine]
max = state.eMarks[nextLine]
if (pos < max && state.sCount[nextLine] < state.blkIndent) {
// non-empty line with negative indent should stop the list:
// - ```
// test
break
}
if (state.src.charCodeAt(pos) !== marker) { continue }
if (state.sCount[nextLine] - state.blkIndent >= 4) {
// closing fence should be indented less than 4 spaces
continue
}
pos = state.skipChars(pos, marker)
// closing code fence must be at least as long as the opening one
if (pos - mem < len) { continue }
// make sure tail has spaces only
pos = state.skipSpaces(pos)
if (pos < max) { continue }
haveEndMarker = true
// found!
break
}
// If a fence has heading spaces, they should be removed from its inner block
len = state.sCount[startLine]
state.line = nextLine + (haveEndMarker ? 1 : 0)
const token = state.push('fence', 'code', 0)
token.info = params
token.content = state.getLines(startLine + 1, nextLine, len, true)
token.markup = markup
token.map = [startLine, state.line]
return true
}
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