290144e9
 易尊强
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'use strict';
var normalizeReference = require('../common/utils').normalizeReference;
var isSpace = require('../common/utils').isSpace;
module.exports = function reference(state, startLine, _endLine, silent) {
var ch,
destEndPos,
destEndLineNo,
endLine,
href,
i,
l,
label,
labelEnd,
oldParentType,
res,
start,
str,
terminate,
terminatorRules,
title,
lines = 0,
pos = state.bMarks[startLine] + state.tShift[startLine],
max = state.eMarks[startLine],
nextLine = startLine + 1;
// if it's indented more than 3 spaces, it should be a code block
if (state.sCount[startLine] - state.blkIndent >= 4) { return false; }
if (state.src.charCodeAt(pos) !== 0x5B/* [ */) { return false; }
// Simple check to quickly interrupt scan on [link](url) at the start of line.
// Can be useful on practice: https://github.com/markdown-it/markdown-it/issues/54
while (++pos < max) {
if (state.src.charCodeAt(pos) === 0x5D /* ] */ &&
state.src.charCodeAt(pos - 1) !== 0x5C/* \ */) {
if (pos + 1 === max) { return false; }
if (state.src.charCodeAt(pos + 1) !== 0x3A/* : */) { return false; }
break;
}
}
endLine = state.lineMax;
// jump line-by-line until empty one or EOF
terminatorRules = state.md.block.ruler.getRules('reference');
oldParentType = state.parentType;
state.parentType = 'reference';
for (; nextLine < endLine && !state.isEmpty(nextLine); nextLine++) {
// this would be a code block normally, but after paragraph
// it's considered a lazy continuation regardless of what's there
if (state.sCount[nextLine] - state.blkIndent > 3) { continue; }
// quirk for blockquotes, this line should already be checked by that rule
if (state.sCount[nextLine] < 0) { continue; }
// Some tags can terminate paragraph without empty line.
terminate = false;
for (i = 0, l = terminatorRules.length; i < l; i++) {
if (terminatorRules[i](state, nextLine, endLine, true)) {
terminate = true;
break;
}
}
if (terminate) { break; }
}
str = state.getLines(startLine, nextLine, state.blkIndent, false).trim();
max = str.length;
for (pos = 1; pos < max; pos++) {
ch = str.charCodeAt(pos);
if (ch === 0x5B /* [ */) {
return false;
} else if (ch === 0x5D /* ] */) {
labelEnd = pos;
break;
} else if (ch === 0x0A /* \n */) {
lines++;
} else if (ch === 0x5C /* \ */) {
pos++;
if (pos < max && str.charCodeAt(pos) === 0x0A) {
lines++;
}
}
}
if (labelEnd < 0 || str.charCodeAt(labelEnd + 1) !== 0x3A/* : */) { return false; }
// [label]: destination 'title'
// ^^^ skip optional whitespace here
for (pos = labelEnd + 2; pos < max; pos++) {
ch = str.charCodeAt(pos);
if (ch === 0x0A) {
lines++;
} else if (isSpace(ch)) {
/*eslint no-empty:0*/
} else {
break;
}
}
// [label]: destination 'title'
// ^^^^^^^^^^^ parse this
res = state.md.helpers.parseLinkDestination(str, pos, max);
if (!res.ok) { return false; }
href = state.md.normalizeLink(res.str);
if (!state.md.validateLink(href)) { return false; }
pos = res.pos;
lines += res.lines;
// save cursor state, we could require to rollback later
destEndPos = pos;
destEndLineNo = lines;
// [label]: destination 'title'
// ^^^ skipping those spaces
start = pos;
for (; pos < max; pos++) {
ch = str.charCodeAt(pos);
if (ch === 0x0A) {
lines++;
} else if (isSpace(ch)) {
/*eslint no-empty:0*/
} else {
break;
}
}
// [label]: destination 'title'
// ^^^^^^^ parse this
res = state.md.helpers.parseLinkTitle(str, pos, max);
if (pos < max && start !== pos && res.ok) {
title = res.str;
pos = res.pos;
lines += res.lines;
} else {
title = '';
pos = destEndPos;
lines = destEndLineNo;
}
// skip trailing spaces until the rest of the line
while (pos < max) {
ch = str.charCodeAt(pos);
if (!isSpace(ch)) { break; }
pos++;
}
if (pos < max && str.charCodeAt(pos) !== 0x0A) {
if (title) {
// garbage at the end of the line after title,
// but it could still be a valid reference if we roll back
title = '';
pos = destEndPos;
lines = destEndLineNo;
while (pos < max) {
ch = str.charCodeAt(pos);
if (!isSpace(ch)) { break; }
pos++;
}
}
}
if (pos < max && str.charCodeAt(pos) !== 0x0A) {
// garbage at the end of the line
return false;
}
label = normalizeReference(str.slice(1, labelEnd));
if (!label) {
// CommonMark 0.20 disallows empty labels
return false;
}
// Reference can not terminate anything. This check is for safety only.
/*istanbul ignore if*/
if (silent) { return true; }
if (typeof state.env.references === 'undefined') {
state.env.references = {};
}
if (typeof state.env.references[label] === 'undefined') {
state.env.references[label] = { title: title, href: href };
}
state.parentType = oldParentType;
state.line = startLine + lines + 1;
return true;
};
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