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Improve behavior of formatting buttons

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* Synthesize an input event to trigger a preview update.
* Slightly tweak the algorithm.
This commit is contained in:
gldrk 2023-11-29 08:18:10 +00:00
parent 61ec760536
commit 09c3bd9e42
1 changed files with 55 additions and 57 deletions
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112
files/assets/js/formatting.js
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@ -1,57 +1,55 @@
function makeBold(form) {
var text = document.getElementById(form);
var startIndex = text.selectionStart,
endIndex = text.selectionEnd;
var selectedText = text.value.substring(startIndex, endIndex);
var format = '**'
if (selectedText.includes('**')) {
text.value = selectedText.replace(/\*/g, '');
}
else if (selectedText.length == 0) {
text.value = text.value.substring(0, startIndex) + selectedText + text.value.substring(endIndex);
}
else {
text.value = text.value.substring(0, startIndex) + format + selectedText + format + text.value.substring(endIndex);
}
}
function makeItalics(form) {
var text = document.getElementById(form);
var startIndex = text.selectionStart,
endIndex = text.selectionEnd;
var selectedText = text.value.substring(startIndex, endIndex);
var format = '*'
if (selectedText.includes('*')) {
text.value = selectedText.replace(/\*/g, '');
}
else if (selectedText.length == 0) {
text.value = text.value.substring(0, startIndex) + selectedText + text.value.substring(endIndex);
}
else {
text.value = text.value.substring(0, startIndex) + format + selectedText + format + text.value.substring(endIndex);
}
}
function makeQuote(form) {
var text = document.getElementById(form);
var startIndex = text.selectionStart,
endIndex = text.selectionEnd;
var selectedText = text.value.substring(startIndex, endIndex);
var format = '>'
if (selectedText.includes('>')) {
text.value = text.value.substring(0, startIndex) + selectedText.replace(/\>/g, '') + text.value.substring(endIndex);
}
else if (selectedText.length == 0) {
text.value = text.value.substring(0, startIndex) + selectedText + text.value.substring(endIndex);
}
else {
text.value = text.value.substring(0, startIndex) + format + selectedText + text.value.substring(endIndex);
}
}
(function() {
var event = InputEvent
? function(type, attrs) {
return new InputEvent(type, attrs);
}
: function(type) {
e = document.createEvent('event');
e.initEvent(type, false, false);
return e;
};
var escape = function(str) {
return str.replace(/./g, '[$&]').replace(/[\\^]|]]/g, '\\$&');
};
var wrap = function(cb) {
return function(id) {
var form = document.getElementById(id);
if (cb(form)) {
var e = event('input', { inputType: 'insertReplacementText' });
form.dispatchEvent(e);
}
}
};
var select = function(cb) {
return function(form) {
var begin = form.selectionStart, end = form.selectionEnd;
if (begin == end)
return false;
form.value = form.value.substring(0, begin)
+ cb(form.value.substring(begin, end))
+ form.value.substring(end);
return true;
};
};
var enclose = function(mark) {
var re = new RegExp(escape(mark) + '(\\S.*?\\S|\\S)' + escape(mark), 'g');
return select(function(selection) {
var replacement = selection.replace(re, '$1');
if (replacement.length == selection.length)
replacement = mark + replacement + mark;
return replacement;
});
};
var quote = select(function(selection) {
var lines = selection.split('\n');
if (lines.some(function(line) { return /^\s*[^\s>]/.test(line) }))
return '>' + lines.join('\n>');
else
return lines.map(function(line) {
return line.substring(line.indexOf('>') + 1);
}).join('\n');
});
makeItalics = wrap(enclose('*'));
makeBold = wrap(enclose('**'));
makeQuote = wrap(quote);
})()