https://rusaggression.gov.ua/zerum/js/codemirror/addon/search/match-highlighter.js

1// CodeMirror, copyright (c) by Marijn Haverbeke and others
2// Distributed under an MIT license: https://codemirror.net/LICENSE
3
4// Highlighting text that matches the selection
5//
6// Defines an option highlightSelectionMatches, which, when enabled,
7// will style strings that match the selection throughout the
8// document.
9//
10// The option can be set to true to simply enable it, or to a
11// {minChars, style, wordsOnly, showToken, delay} object to explicitly
12// configure it. minChars is the minimum amount of characters that should be
13// selected for the behavior to occur, and style is the token style to
14// apply to the matches. This will be prefixed by "cm-" to create an
15// actual CSS class name. If wordsOnly is enabled, the matches will be
16// highlighted only if the selected text is a word. showToken, when enabled,
17// will cause the current token to be highlighted when nothing is selected.
18// delay is used to specify how much time to wait, in milliseconds, before
19// highlighting the matches. If annotateScrollbar is enabled, the occurrences
20// will be highlighted on the scrollbar via the matchesonscrollbar addon.
21
22(function(mod) {
23  if (typeof exports == "object" && typeof module == "object") // CommonJS
24    mod(require("../../lib/codemirror"), require("./matchesonscrollbar"));
25  else if (typeof define == "function" && define.amd) // AMD
26    define(["../../lib/codemirror", "./matchesonscrollbar"], mod);
27  else // Plain browser env
28    mod(CodeMirror);
29})(function(CodeMirror) {
30  "use strict";
31
32  var defaults = {
33    style: "matchhighlight",
34    minChars: 2,
35    delay: 100,
36    wordsOnly: false,
37    annotateScrollbar: false,
38    showToken: false,
39    trim: true
40  }
41
42  function State(options) {
43    this.options = {}
44    for (var name in defaults)
45      this.options[name] = (options && options.hasOwnProperty(name) ? options : defaults)[name]
46    this.overlay = this.timeout = null;
47    this.matchesonscroll = null;
48    this.active = false;
49  }
50
51  CodeMirror.defineOption("highlightSelectionMatches", false, function(cm, val, old) {
52    if (old && old != CodeMirror.Init) {
53      removeOverlay(cm);
54      clearTimeout(cm.state.matchHighlighter.timeout);
55      cm.state.matchHighlighter = null;
56      cm.off("cursorActivity", cursorActivity);
57      cm.off("focus", onFocus)
58    }
59    if (val) {
60      var state = cm.state.matchHighlighter = new State(val);
61      if (cm.hasFocus()) {
62        state.active = true
63        highlightMatches(cm)
64      } else {
65        cm.on("focus", onFocus)
66      }
67      cm.on("cursorActivity", cursorActivity);
68    }
69  });
70
71  function cursorActivity(cm) {
72    var state = cm.state.matchHighlighter;
73    if (state.active || cm.hasFocus()) scheduleHighlight(cm, state)
74  }
75
76  function onFocus(cm) {
77    var state = cm.state.matchHighlighter
78    if (!state.active) {
79      state.active = true
80      scheduleHighlight(cm, state)
81    }
82  }
83
84  function scheduleHighlight(cm, state) {
85    clearTimeout(state.timeout);
86    state.timeout = setTimeout(function() {highlightMatches(cm);}, state.options.delay);
87  }
88
89  function addOverlay(cm, query, hasBoundary, style) {
90    var state = cm.state.matchHighlighter;
91    cm.addOverlay(state.overlay = makeOverlay(query, hasBoundary, style));
92    if (state.options.annotateScrollbar && cm.showMatchesOnScrollbar) {
93      var searchFor = hasBoundary ? new RegExp((/\w/.test(query.charAt(0)) ? "\\b" : "") +
94                                               query.replace(/[\\\[.+*?(){|^$]/g, "\\$&") +
95                                               (/\w/.test(query.charAt(query.length - 1)) ? "\\b" : "")) : query;
96      state.matchesonscroll = cm.showMatchesOnScrollbar(searchFor, false,
97        {className: "CodeMirror-selection-highlight-scrollbar"});
98    }
99  }
100
101  function removeOverlay(cm) {
102    var state = cm.state.matchHighlighter;
103    if (state.overlay) {
104      cm.removeOverlay(state.overlay);
105      state.overlay = null;
106      if (state.matchesonscroll) {
107        state.matchesonscroll.clear();
108        state.matchesonscroll = null;
109      }
110    }
111  }
112
113  function highlightMatches(cm) {
114    cm.operation(function() {
115      var state = cm.state.matchHighlighter;
116      removeOverlay(cm);
117      if (!cm.somethingSelected() && state.options.showToken) {
118        var re = state.options.showToken === true ? /[\w$]/ : state.options.showToken;
119        var cur = cm.getCursor(), line = cm.getLine(cur.line), start = cur.ch, end = start;
120        while (start && re.test(line.charAt(start - 1))) --start;
121        while (end < line.length && re.test(line.charAt(end))) ++end;
122        if (start < end)
123          addOverlay(cm, line.slice(start, end), re, state.options.style);
124        return;
125      }
126      var from = cm.getCursor("from"), to = cm.getCursor("to");
127      if (from.line != to.line) return;
128      if (state.options.wordsOnly && !isWord(cm, from, to)) return;
129      var selection = cm.getRange(from, to)
130      if (state.options.trim) selection = selection.replace(/^\s+|\s+$/g, "")
131      if (selection.length >= state.options.minChars)
132        addOverlay(cm, selection, false, state.options.style);
133    });
134  }
135
136  function isWord(cm, from, to) {
137    var str = cm.getRange(from, to);
138    if (str.match(/^\w+$/) !== null) {
139        if (from.ch > 0) {
140            var pos = {line: from.line, ch: from.ch - 1};
141            var chr = cm.getRange(pos, from);
142            if (chr.match(/\W/) === null) return false;
143        }
144        if (to.ch < cm.getLine(from.line).length) {
145            var pos = {line: to.line, ch: to.ch + 1};
146            var chr = cm.getRange(to, pos);
147            if (chr.match(/\W/) === null) return false;
148        }
149        return true;
150    } else return false;
151  }
152
153  function boundariesAround(stream, re) {
154    return (!stream.start || !re.test(stream.string.charAt(stream.start - 1))) &&
155      (stream.pos == stream.string.length || !re.test(stream.string.charAt(stream.pos)));
156  }
157
158  function makeOverlay(query, hasBoundary, style) {
159    return {token: function(stream) {
160      if (stream.match(query) &&
161          (!hasBoundary || boundariesAround(stream, hasBoundary)))
162        return style;
163      stream.next();
164      stream.skipTo(query.charAt(0)) || stream.skipToEnd();
165    }};
166  }
167});