119 lines
2.8 KiB
JavaScript
119 lines
2.8 KiB
JavaScript
/*\
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title: $:/core/modules/parsers/wikiparser/rules/prettyextlink.js
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type: application/javascript
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module-type: wikirule
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Wiki text inline rule for external links. For example:
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```
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[ext[https://tiddlywiki.com/fractalveg.jpg]]
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[ext[Tooltip|https://tiddlywiki.com/fractalveg.jpg]]
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```
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\*/
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(function(){
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/*jslint node: true, browser: true */
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/*global $tw: false */
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"use strict";
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exports.name = "prettyextlink";
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exports.types = {inline: true};
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exports.init = function(parser) {
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this.parser = parser;
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};
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exports.findNextMatch = function(startPos) {
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// Find the next tag
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this.nextLink = this.findNextLink(this.parser.source,startPos);
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return this.nextLink ? this.nextLink.start : undefined;
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};
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exports.parse = function() {
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// Move past the match
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this.parser.pos = this.nextLink.end;
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return [this.nextLink];
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};
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/*
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Find the next link from the current position
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*/
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exports.findNextLink = function(source,pos) {
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// A regexp for finding candidate links
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var reLookahead = /(\[ext\[)/g;
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// Find the next candidate
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reLookahead.lastIndex = pos;
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var match = reLookahead.exec(source);
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while(match) {
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// Try to parse the candidate as a link
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var link = this.parseLink(source,match.index);
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// Return success
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if(link) {
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return link;
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}
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// Look for the next match
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reLookahead.lastIndex = match.index + 1;
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match = reLookahead.exec(source);
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}
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// Failed
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return null;
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};
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/*
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Look for an link at the specified position. Returns null if not found, otherwise returns {type: "element", tag: "a", attributes: [], isSelfClosing:, start:, end:,}
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*/
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exports.parseLink = function(source,pos) {
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var token,
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textNode = {
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type: "text"
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},
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node = {
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type: "element",
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tag: "a",
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start: pos,
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attributes: {
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"class": {type: "string", value: "tc-tiddlylink-external"},
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},
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children: [textNode]
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};
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// Skip whitespace
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pos = $tw.utils.skipWhiteSpace(source,pos);
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// Look for the `[ext[`
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token = $tw.utils.parseTokenString(source,pos,"[ext[");
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if(!token) {
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return null;
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}
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pos = token.end;
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// Look ahead for the terminating `]]`
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var closePos = source.indexOf("]]",pos);
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if(closePos === -1) {
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return null;
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}
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// Look for a `|` separating the tooltip
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var splitPos = source.indexOf("|",pos);
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if(splitPos === -1 || splitPos > closePos) {
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splitPos = null;
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}
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// Pull out the tooltip and URL
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var tooltip, URL;
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textNode.start = pos;
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if(splitPos) {
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URL = source.substring(splitPos + 1,closePos).trim();
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textNode.text = source.substring(pos,splitPos).trim();
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textNode.end = splitPos;
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} else {
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URL = source.substring(pos,closePos).trim();
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textNode.text = URL;
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textNode.end = closePos;
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}
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node.attributes.href = {type: "string", value: URL};
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node.attributes.target = {type: "string", value: "_blank"};
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node.attributes.rel = {type: "string", value: "noopener noreferrer"};
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// Update the end position
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node.end = closePos + 2;
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return node;
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};
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})();
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