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// fences (``` lang, ~~~ lang)
'use strict';
module.exports = function fence(state, startLine, endLine, silent) {
var marker, len, params, nextLine, mem, token, markup,
haveEndMarker = false,
pos = state.bMarks[startLine] + state.tShift[startLine],
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; }
marker = state.src.charCodeAt(pos);
if (marker !== 0x7E/* ~ */ && marker !== 0x60 /* ` */) {
return false;
}
// scan marker length
mem = pos;
pos = state.skipChars(pos, marker);
len = pos - mem;
if (len < 3) { return false; }
markup = state.src.slice(mem, pos);
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
nextLine = startLine;
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);
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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