87 lines
3.0 KiB
JavaScript
87 lines
3.0 KiB
JavaScript
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// Highlighting text that matches the selection
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//
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// Defines an option highlightSelectionMatches, which, when enabled,
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// will style strings that match the selection throughout the
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// document.
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//
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// The option can be set to true to simply enable it, or to a
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// {minChars, style, showToken} object to explicitly configure it.
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// minChars is the minimum amount of characters that should be
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// selected for the behavior to occur, and style is the token style to
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// apply to the matches. This will be prefixed by "cm-" to create an
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// actual CSS class name. showToken, when enabled, will cause the
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// current token to be highlighted when nothing is selected.
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(function() {
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var DEFAULT_MIN_CHARS = 2;
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var DEFAULT_TOKEN_STYLE = "matchhighlight";
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function State(options) {
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if (typeof options == "object") {
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this.minChars = options.minChars;
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this.style = options.style;
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this.showToken = options.showToken;
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}
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if (this.style == null) this.style = DEFAULT_TOKEN_STYLE;
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if (this.minChars == null) this.minChars = DEFAULT_MIN_CHARS;
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this.overlay = this.timeout = null;
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}
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CodeMirror.defineOption("highlightSelectionMatches", false, function(cm, val, old) {
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if (old && old != CodeMirror.Init) {
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var over = cm.state.matchHighlighter.overlay;
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if (over) cm.removeOverlay(over);
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clearTimeout(cm.state.matchHighlighter.timeout);
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cm.state.matchHighlighter = null;
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cm.off("cursorActivity", cursorActivity);
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}
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if (val) {
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cm.state.matchHighlighter = new State(val);
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highlightMatches(cm);
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cm.on("cursorActivity", cursorActivity);
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}
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});
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function cursorActivity(cm) {
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var state = cm.state.matchHighlighter;
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clearTimeout(state.timeout);
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state.timeout = setTimeout(function() {highlightMatches(cm);}, 100);
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}
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function highlightMatches(cm) {
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cm.operation(function() {
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var state = cm.state.matchHighlighter;
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if (state.overlay) {
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cm.removeOverlay(state.overlay);
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state.overlay = null;
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}
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if (!cm.somethingSelected() && state.showToken) {
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var tok = cm.getTokenAt(cm.getCursor()).string;
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if (/\w/.test(tok))
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cm.addOverlay(state.overlay = makeOverlay(tok, true, state.style));
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return;
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}
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if (cm.getCursor("head").line != cm.getCursor("anchor").line) return;
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var selection = cm.getSelection().replace(/^\s+|\s+$/g, "");
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if (selection.length >= state.minChars)
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cm.addOverlay(state.overlay = makeOverlay(selection, false, state.style));
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});
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}
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function boundariesAround(stream) {
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return (stream.start || /.\b./.test(stream.string.slice(stream.start - 1, stream.start + 1))) &&
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(stream.pos == stream.string.length || /.\b./.test(stream.string.slice(stream.pos - 1, stream.pos + 1)));
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}
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function makeOverlay(query, wordBoundaries, style) {
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return {token: function(stream) {
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if (stream.match(query) &&
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(!wordBoundaries || boundariesAround(stream)))
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return style;
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stream.next();
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stream.skipTo(query.charAt(0)) || stream.skipToEnd();
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}};
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}
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})();
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