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✏️ Editing: match-highlighter.js

// CodeMirror, copyright (c) by Marijn Haverbeke and others

// Distributed under an MIT license: http://codemirror.net/LICENSE

// Highlighting text that matches the selection

// Defines an option highlightSelectionMatches, which, when enabled,

// will style strings that match the selection throughout the

// document.

// The option can be set to true to simply enable it, or to a

// {minChars, style, wordsOnly, showToken, delay} object to explicitly

// configure it. minChars is the minimum amount of characters that should be

// selected for the behavior to occur, and style is the token style to

// apply to the matches. This will be prefixed by "cm-" to create an

// actual CSS class name. If wordsOnly is enabled, the matches will be

// highlighted only if the selected text is a word. showToken, when enabled,

// will cause the current token to be highlighted when nothing is selected.

// delay is used to specify how much time to wait, in milliseconds, before

// highlighting the matches.

(function(mod) {

if (typeof exports == "object" && typeof module == "object") // CommonJS

mod(require("../../lib/codemirror"));

else if (typeof define == "function" && define.amd) // AMD

define(["../../lib/codemirror"], mod);

else // Plain browser env

mod(CodeMirror);

})(function(CodeMirror) {

"use strict";

var DEFAULT_MIN_CHARS = 2;

var DEFAULT_TOKEN_STYLE = "matchhighlight";

var DEFAULT_DELAY = 100;

var DEFAULT_WORDS_ONLY = false;

function State(options) {

if (typeof options == "object") {

this.minChars = options.minChars;

this.style = options.style;

this.showToken = options.showToken;

this.delay = options.delay;

this.wordsOnly = options.wordsOnly;

}

if (this.style == null) this.style = DEFAULT_TOKEN_STYLE;

if (this.minChars == null) this.minChars = DEFAULT_MIN_CHARS;

if (this.delay == null) this.delay = DEFAULT_DELAY;

if (this.wordsOnly == null) this.wordsOnly = DEFAULT_WORDS_ONLY;

this.overlay = this.timeout = null;

}

CodeMirror.defineOption("highlightSelectionMatches", false, function(cm, val, old) {

if (old && old != CodeMirror.Init) {

var over = cm.state.matchHighlighter.overlay;

if (over) cm.removeOverlay(over);

clearTimeout(cm.state.matchHighlighter.timeout);

cm.state.matchHighlighter = null;

cm.off("cursorActivity", cursorActivity);

}

if (val) {

cm.state.matchHighlighter = new State(val);

highlightMatches(cm);

cm.on("cursorActivity", cursorActivity);

}

});

function cursorActivity(cm) {

var state = cm.state.matchHighlighter;

clearTimeout(state.timeout);

state.timeout = setTimeout(function() {highlightMatches(cm);}, state.delay);

}

function highlightMatches(cm) {

cm.operation(function() {

var state = cm.state.matchHighlighter;

if (state.overlay) {

cm.removeOverlay(state.overlay);

state.overlay = null;

}

if (!cm.somethingSelected() && state.showToken) {

var re = state.showToken === true ? /[\w$]/ : state.showToken;

var cur = cm.getCursor(), line = cm.getLine(cur.line), start = cur.ch, end = start;

while (start && re.test(line.charAt(start - 1))) --start;

while (end < line.length && re.test(line.charAt(end))) ++end;

if (start < end)

cm.addOverlay(state.overlay = makeOverlay(line.slice(start, end), re, state.style));

return;

}

var from = cm.getCursor("from"), to = cm.getCursor("to");

if (from.line != to.line) return;

if (state.wordsOnly && !isWord(cm, from, to)) return;

var selection = cm.getRange(from, to).replace(/^\s+|\s+$/g, "");

if (selection.length >= state.minChars)

cm.addOverlay(state.overlay = makeOverlay(selection, false, state.style));

});

}

function isWord(cm, from, to) {

var str = cm.getRange(from, to);

if (str.match(/^\w+$/) !== null) {

if (from.ch > 0) {

var pos = {line: from.line, ch: from.ch - 1};

var chr = cm.getRange(pos, from);

if (chr.match(/\W/) === null) return false;

}

if (to.ch < cm.getLine(from.line).length) {

var pos = {line: to.line, ch: to.ch + 1};

var chr = cm.getRange(to, pos);

if (chr.match(/\W/) === null) return false;

}

return true;

} else return false;

}

function boundariesAround(stream, re) {

return (!stream.start || !re.test(stream.string.charAt(stream.start - 1))) &&

(stream.pos == stream.string.length || !re.test(stream.string.charAt(stream.pos)));

}

function makeOverlay(query, hasBoundary, style) {

return {token: function(stream) {

if (stream.match(query) &&

(!hasBoundary || boundariesAround(stream, hasBoundary)))

return style;

stream.next();

stream.skipTo(query.charAt(0)) || stream.skipToEnd();

}};

}

});

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