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// Replace link-like texts with link nodes.
//
// Currently restricted by `md.validateLink()` to http/https/ftp
//
'use strict';
var arrayReplaceAt = require('../common/utils').arrayReplaceAt;
function isLinkOpen(str) {
return /^<a[>\s]/i.test(str);
}
function isLinkClose(str) {
return /^<\/a\s*>/i.test(str);
}
module.exports = function linkify(state) {
var i, j, l, tokens, token, currentToken, nodes, ln, text, pos, lastPos,
level, htmlLinkLevel, url, fullUrl, urlText,
blockTokens = state.tokens,
links;
if (!state.md.options.linkify) { return; }
for (j = 0, l = blockTokens.length; j < l; j++) {
if (blockTokens[j].type !== 'inline' ||
!state.md.linkify.pretest(blockTokens[j].content)) {
continue;
}
tokens = blockTokens[j].children;
htmlLinkLevel = 0;
// We scan from the end, to keep position when new tags added.
// Use reversed logic in links start/end match
for (i = tokens.length - 1; i >= 0; i--) {
currentToken = tokens[i];
// Skip content of markdown links
if (currentToken.type === 'link_close') {
i--;
while (tokens[i].level !== currentToken.level && tokens[i].type !== 'link_open') {
i--;
}
continue;
}
// Skip content of html tag links
if (currentToken.type === 'html_inline') {
if (isLinkOpen(currentToken.content) && htmlLinkLevel > 0) {
htmlLinkLevel--;
}
if (isLinkClose(currentToken.content)) {
htmlLinkLevel++;
}
}
if (htmlLinkLevel > 0) { continue; }
if (currentToken.type === 'text' && state.md.linkify.test(currentToken.content)) {
text = currentToken.content;
links = state.md.linkify.match(text);
// Now split string to nodes
nodes = [];
level = currentToken.level;
lastPos = 0;
// forbid escape sequence at the start of the string,
// this avoids http\://example.com/ from being linkified as
// http:<a href="//example.com/">//example.com/</a>
if (links.length > 0 &&
links[0].index === 0 &&
i > 0 &&
tokens[i - 1].type === 'text_special') {
links = links.slice(1);
}
for (ln = 0; ln < links.length; ln++) {
url = links[ln].url;
fullUrl = state.md.normalizeLink(url);
if (!state.md.validateLink(fullUrl)) { continue; }
urlText = links[ln].text;
// Linkifier might send raw hostnames like "example.com", where url
// starts with domain name. So we prepend http:// in those cases,
// and remove it afterwards.
//
if (!links[ln].schema) {
urlText = state.md.normalizeLinkText('http://' + urlText).replace(/^http:\/\//, '');
} else if (links[ln].schema === 'mailto:' && !/^mailto:/i.test(urlText)) {
urlText = state.md.normalizeLinkText('mailto:' + urlText).replace(/^mailto:/, '');
} else {
urlText = state.md.normalizeLinkText(urlText);
}
pos = links[ln].index;
if (pos > lastPos) {
token = new state.Token('text', '', 0);
token.content = text.slice(lastPos, pos);
token.level = level;
nodes.push(token);
}
token = new state.Token('link_open', 'a', 1);
token.attrs = [ [ 'href', fullUrl ] ];
token.level = level++;
token.markup = 'linkify';
token.info = 'auto';
nodes.push(token);
token = new state.Token('text', '', 0);
token.content = urlText;
token.level = level;
nodes.push(token);
token = new state.Token('link_close', 'a', -1);
token.level = --level;
token.markup = 'linkify';
token.info = 'auto';
nodes.push(token);
lastPos = links[ln].lastIndex;
}
if (lastPos < text.length) {
token = new state.Token('text', '', 0);
token.content = text.slice(lastPos);
token.level = level;
nodes.push(token);
}
// replace current node
blockTokens[j].children = tokens = arrayReplaceAt(tokens, i, nodes);
}
}
}
};