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'use strict';
var StateInline = require('./rules_inline/state_inline');
var links = require('./rules_inline/links');
var skipSpaces = require('./helpers').skipSpaces;
// Parse link reference definition.
//
module.exports = function parse_reference(str, parser, options, env) {
var state, labelEnd, pos, max, code, start, href, title, label;
if (str.charCodeAt(0) !== 0x5B/* [ */) { return -1; }
// TODO: benchmark this
if (str.indexOf(']:') === -1) { return -1; }
state = new StateInline(str, parser, options, env);
labelEnd = links.parseLinkLabel(state, 0);
if (labelEnd < 0 || str.charCodeAt(labelEnd + 1) !== 0x3A/* : */) { return -1; }
max = state.posMax;
// [label]: destination 'title'
// ^^^ skip optional whitespace here
for (pos = labelEnd + 2; pos < max; pos++) {
code = state.src.charCodeAt(pos);
if (code !== 0x20 && code !== 0x0A) { break; }
}
// [label]: destination 'title'
// ^^^^^^^^^^^ parse this
href = links.parseLinkDestination(state, pos);
if (href === null) { return -1; }
pos = state.pos;
// [label]: destination 'title'
// ^^^ skipping those spaces
start = pos;
for (pos = pos + 1; pos < max; pos++) {
code = state.src.charCodeAt(pos);
if (code !== 0x20 && code !== 0x0A) { break; }
}
// [label]: destination 'title'
// ^^^^^^^ parse this
if (pos < max && start !== pos && (title = links.parseLinkTitle(state, pos)) !== null) {
pos = state.pos;
} else {
title = '';
pos = start;
}
// ensure that the end of the line is empty
pos = skipSpaces(state, pos);
if (pos < max && state.src.charCodeAt(pos) !== 0x0A) { return -1; }
label = links.normalizeReference(str.slice(1, labelEnd));
env.references[label] = env.references[label] || { title: title, href: href };
return pos;
};