mirror of https://github.com/zulip/zulip.git
84 lines
2.8 KiB
JavaScript
84 lines
2.8 KiB
JavaScript
var compose_ui = (function () {
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var exports = {};
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exports.autosize_textarea = function () {
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$("#compose-textarea").trigger("autosize.resize");
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};
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exports.smart_insert = function (textarea, syntax) {
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function is_space(c) {
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return c === ' ' || c === '\t' || c === '\n';
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}
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var pos = textarea.caret();
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var before_str = textarea.val().slice(0, pos);
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var after_str = textarea.val().slice(pos);
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if (pos > 0) {
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// If there isn't space either at the end of the content
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// before the insert or (unlikely) at the start of the syntax,
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// add one.
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if (!is_space(before_str.slice(-1)) && !is_space(syntax[0])) {
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syntax = ' ' + syntax;
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}
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}
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// If there isn't whitespace either at the end of the syntax or the
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// start of the content after the syntax, add one.
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if (!(after_str.length > 0 && is_space(after_str[0]) ||
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syntax.length > 0 && is_space(syntax.slice(-1)))) {
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syntax += ' ';
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}
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textarea.focus();
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// We prefer to use insertText, which supports things like undo better
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// for rich-text editing features like inserting links. But we fall
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// back to textarea.caret if the browser doesn't support insertText.
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if (!document.execCommand("insertText", false, syntax)) {
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textarea.caret(syntax);
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}
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// This should just call exports.autosize_textarea, but it's a bit
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// annoying for the unit tests, so we don't do that.
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textarea.trigger("autosize.resize");
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};
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exports.insert_syntax_and_focus = function (syntax, textarea) {
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// Generic helper for inserting syntax into the main compose box
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// where the cursor was and focusing the area. Mostly a thin
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// wrapper around smart_insert.
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if (textarea === undefined) {
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textarea = $('#compose-textarea');
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}
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exports.smart_insert(textarea, syntax);
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};
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exports.replace_syntax = function (old_syntax, new_syntax, textarea) {
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// Replaces `old_syntax` with `new_syntax` text in the compose box. Due to
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// the way that JavaScript handles string replacements, if `old_syntax` is
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// a string it will only replace the first instance. If `old_syntax` is
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// a RegExp with a global flag, it will replace all instances.
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if (textarea === undefined) {
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textarea = $('#compose-textarea');
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}
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textarea.val(textarea.val().replace(old_syntax, function () {
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// We need this anonymous function to avoid JavaScript's
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// replace() function treating `$`s in new_syntax as special syntax. See
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// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/replace#Description
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// for details.
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return new_syntax;
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}));
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};
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return exports;
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}());
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if (typeof module !== 'undefined') {
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module.exports = compose_ui;
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}
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window.compose_ui = compose_ui;
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