55 lines
1.5 KiB
JavaScript
55 lines
1.5 KiB
JavaScript
(function() {
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var event = InputEvent
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? function(type, attrs) {
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return new InputEvent(type, attrs);
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}
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: function(type) {
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e = document.createEvent('event');
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e.initEvent(type, false, false);
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return e;
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};
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var escape = function(str) {
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return str.replace(/./g, '[$&]').replace(/[\\^]|]]/g, '\\$&');
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};
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var wrap = function(cb) {
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return function(id) {
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var form = document.getElementById(id);
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if (cb(form)) {
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var e = event('input', { inputType: 'insertReplacementText' });
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form.dispatchEvent(e);
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}
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}
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};
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var select = function(cb) {
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return function(form) {
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var begin = form.selectionStart, end = form.selectionEnd;
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if (begin == end)
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return false;
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form.value = form.value.substring(0, begin)
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+ cb(form.value.substring(begin, end))
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+ form.value.substring(end);
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return true;
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};
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};
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var enclose = function(mark) {
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var re = new RegExp(escape(mark) + '(\\S.*?\\S|\\S)' + escape(mark), 'g');
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return select(function(selection) {
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var replacement = selection.replace(re, '$1');
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if (replacement.length == selection.length)
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replacement = mark + replacement + mark;
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return replacement;
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});
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};
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var quote = select(function(selection) {
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var lines = selection.split('\n');
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if (lines.some(function(line) { return /^\s*[^\s>]/.test(line) }))
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return '>' + lines.join('\n>');
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else
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return lines.map(function(line) {
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return line.substring(line.indexOf('>') + 1);
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}).join('\n');
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});
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makeItalics = wrap(enclose('*'));
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makeBold = wrap(enclose('**'));
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makeQuote = wrap(quote);
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})()
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