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// Parse link destination
//
// on success it returns a string and updates state.pos;
// on failure it returns null
//
'use strict';
var normalizeLink = require('../common/utils').normalizeLink;
var unescapeMd = require('../common/utils').unescapeMd;
module.exports = function parseLinkDestination(state, pos) {
var code, level, link,
start = pos,
max = state.posMax;
if (state.src.charCodeAt(pos) === 0x3C /* < */) {
pos++;
while (pos < max) {
code = state.src.charCodeAt(pos);
if (code === 0x0A /* \n */) { return false; }
if (code === 0x3E /* > */) {
link = normalizeLink(unescapeMd(state.src.slice(start + 1, pos)));
if (!state.parser.validateLink(link)) { return false; }
state.pos = pos + 1;
state.linkContent = link;
return true;
}
if (code === 0x5C /* \ */ && pos + 1 < max) {
pos += 2;
continue;
}
pos++;
}
// no closing '>'
return false;
}
// this should be ... } else { ... branch
level = 0;
while (pos < max) {
code = state.src.charCodeAt(pos);
if (code === 0x20) { break; }
// ascii control characters
if (code < 0x20 || code === 0x7F) { break; }
if (code === 0x5C /* \ */ && pos + 1 < max) {
pos += 2;
continue;
}
if (code === 0x28 /* ( */) {
level++;
if (level > 1) { break; }
}
if (code === 0x29 /* ) */) {
level--;
if (level < 0) { break; }
}
pos++;
}
if (start === pos) { return false; }
link = normalizeLink(unescapeMd(state.src.slice(start, pos)));
if (!state.parser.validateLink(link)) { return false; }
state.linkContent = link;
state.pos = pos;
return true;
};