105 lines
3.8 KiB
JavaScript
105 lines
3.8 KiB
JavaScript
/**
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* Turn Markdown image shortcuts into <img> tags.
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*/
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showdown.subParser('images', function (text, options, globals) {
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'use strict';
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text = globals.converter._dispatch('images.before', text, options, globals);
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var inlineRegExp = /!\[([^\]]*?)][ \t]*()\([ \t]?<?([\S]+?(?:\([\S]*?\)[\S]*?)?)>?(?: =([*\d]+[A-Za-z%]{0,4})x([*\d]+[A-Za-z%]{0,4}))?[ \t]*(?:(["'])([^"]*?)\6)?[ \t]?\)/g,
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crazyRegExp = /!\[([^\]]*?)][ \t]*()\([ \t]?<([^>]*)>(?: =([*\d]+[A-Za-z%]{0,4})x([*\d]+[A-Za-z%]{0,4}))?[ \t]*(?:(?:(["'])([^"]*?)\6))?[ \t]?\)/g,
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base64RegExp = /!\[([^\]]*?)][ \t]*()\([ \t]?<?(data:.+?\/.+?;base64,[A-Za-z0-9+/=\n]+?)>?(?: =([*\d]+[A-Za-z%]{0,4})x([*\d]+[A-Za-z%]{0,4}))?[ \t]*(?:(["'])([^"]*?)\6)?[ \t]?\)/g,
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referenceRegExp = /!\[([^\]]*?)] ?(?:\n *)?\[([\s\S]*?)]()()()()()/g,
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refShortcutRegExp = /!\[([^\[\]]+)]()()()()()/g;
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function writeImageTagBase64 (wholeMatch, altText, linkId, url, width, height, m5, title) {
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url = url.replace(/\s/g, '');
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return writeImageTag (wholeMatch, altText, linkId, url, width, height, m5, title);
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}
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function writeImageTag (wholeMatch, altText, linkId, url, width, height, m5, title) {
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var gUrls = globals.gUrls,
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gTitles = globals.gTitles,
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gDims = globals.gDimensions;
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linkId = linkId.toLowerCase();
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if (!title) {
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title = '';
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}
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// Special case for explicit empty url
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if (wholeMatch.search(/\(<?\s*>? ?(['"].*['"])?\)$/m) > -1) {
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url = '';
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} else if (url === '' || url === null) {
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if (linkId === '' || linkId === null) {
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// lower-case and turn embedded newlines into spaces
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linkId = altText.toLowerCase().replace(/ ?\n/g, ' ');
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}
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url = '#' + linkId;
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if (!showdown.helper.isUndefined(gUrls[linkId])) {
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url = gUrls[linkId];
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if (!showdown.helper.isUndefined(gTitles[linkId])) {
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title = gTitles[linkId];
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}
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if (!showdown.helper.isUndefined(gDims[linkId])) {
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width = gDims[linkId].width;
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height = gDims[linkId].height;
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}
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} else {
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return wholeMatch;
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}
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}
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altText = altText
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.replace(/"/g, '"')
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//altText = showdown.helper.escapeCharacters(altText, '*_', false);
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.replace(showdown.helper.regexes.asteriskDashAndColon, showdown.helper.escapeCharactersCallback);
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//url = showdown.helper.escapeCharacters(url, '*_', false);
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url = url.replace(showdown.helper.regexes.asteriskDashAndColon, showdown.helper.escapeCharactersCallback);
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var result = '<img src="' + url + '" alt="' + altText + '"';
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if (title && showdown.helper.isString(title)) {
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title = title
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.replace(/"/g, '"')
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//title = showdown.helper.escapeCharacters(title, '*_', false);
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.replace(showdown.helper.regexes.asteriskDashAndColon, showdown.helper.escapeCharactersCallback);
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result += ' title="' + title + '"';
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}
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if (width && height) {
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width = (width === '*') ? 'auto' : width;
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height = (height === '*') ? 'auto' : height;
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result += ' width="' + width + '"';
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result += ' height="' + height + '"';
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}
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result += ' />';
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return result;
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}
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// First, handle reference-style labeled images: ![alt text][id]
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text = text.replace(referenceRegExp, writeImageTag);
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// Next, handle inline images: 
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// base64 encoded images
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text = text.replace(base64RegExp, writeImageTagBase64);
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// cases with crazy urls like ./image/cat1).png
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text = text.replace(crazyRegExp, writeImageTag);
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// normal cases
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text = text.replace(inlineRegExp, writeImageTag);
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// handle reference-style shortcuts: ![img text]
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text = text.replace(refShortcutRegExp, writeImageTag);
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text = globals.converter._dispatch('images.after', text, options, globals);
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return text;
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});
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