modules/isearch.js

   1 /**
   2  * (C) Copyright 2004-2005 Shawn Betts
   3  * (C) Copyright 2007-2008 Jeremy Maitin-Shepard
   4  * (C) Copyright 2008 Nelson Elhage
   5  * (C) Copyright 2008-2010 John Foerch
   6  *
   7  * Use, modification, and distribution are subject to the terms specified in the
   8  * COPYING file.
   9 **/
  10
  11 define_variable("isearch_keep_selection", false,
  12     "Set to `true' to make isearch leave the selection visible when a "+
  13     "search is completed.");
  14
  15
  16 function initial_isearch_state (buffer, frame, forward) {
  17     this.screenx = frame.scrollX;
  18     this.screeny = frame.scrollY;
  19     this.search_str = "";
  20     this.wrapped = false;
  21     let sel = frame.getSelection(Ci.nsISelectionController.SELECTION_NORMAL);
  22     if (sel.rangeCount > 0) {
  23         this.point = sel.getRangeAt(0);
  24         if (caret_enabled(buffer))
  25             this.caret = this.point.cloneRange();
  26     } else {
  27         this.point = null;
  28     }
  29     this.range = frame.document.createRange();
  30     this.selection = null;
  31     this.direction = forward;
  32 }
  33
  34 function isearch_session (minibuffer, forward) {
  35     minibuffer_input_state.call(this, minibuffer, isearch_keymap, "");
  36     this.states = [];
  37     this.buffer = this.minibuffer.window.buffers.current;
  38     this.frame = this.buffer.focused_frame;
  39     this.sel_ctrl = this.buffer.focused_selection_controller;
  40     this.sel_ctrl.setDisplaySelection(Ci.nsISelectionController.SELECTION_ATTENTION);
  41     this.sel_ctrl.repaintSelection(Ci.nsISelectionController.SELECTION_NORMAL);
  42     this.states.push(new initial_isearch_state(this.buffer, this.frame, forward));
  43 }
  44 isearch_session.prototype = {
  45     constructor: isearch_session,
  46     __proto__: minibuffer_input_state.prototype,
  47
  48     get top () {
  49         return this.states[this.states.length - 1];
  50     },
  51     _set_selection: function (range) {
  52         const selctrlcomp = Ci.nsISelectionController;
  53         var sel = this.sel_ctrl.getSelection(selctrlcomp.SELECTION_NORMAL);
  54         sel.removeAllRanges();
  55         sel.addRange(range.cloneRange());
  56         this.sel_ctrl.scrollSelectionIntoView(selctrlcomp.SELECTION_NORMAL,
  57                                               selctrlcomp.SELECTION_FOCUS_REGION,
  58                                               true);
  59     },
  60     _clear_selection: function () {
  61         const selctrlcomp = Ci.nsISelectionController;
  62         var sel = this.sel_ctrl.getSelection(selctrlcomp.SELECTION_NORMAL);
  63         sel.removeAllRanges();
  64     },
  65     restore_state: function () {
  66         var m = this.minibuffer;
  67         var s = this.top;
  68         m.ignore_input_events = true;
  69         m._input_text = s.search_str;
  70         m.ignore_input_events = false;
  71         if (s.selection)
  72             this._set_selection(s.selection);
  73         else
  74             this._clear_selection();
  75         this.frame.scrollTo(s.screenx, s.screeny);
  76         m.prompt = ((s.wrapped ? "Wrapped ":"")
  77                     + (s.range ? "" : "Failing ")
  78                     + "I-Search" + (s.direction? "": " backward") + ":");
  79     },
  80     _highlight_find: function (str, wrapped, dir, pt) {
  81         var doc = this.frame.document;
  82         var finder = (Cc["@mozilla.org/embedcomp/rangefind;1"]
  83                       .createInstance()
  84                       .QueryInterface(Ci.nsIFind));
  85         var searchRange;
  86         var startPt;
  87         var endPt;
  88         var body = doc.documentElement;
  89
  90         finder.findBackwards = !dir;
  91         finder.caseSensitive = (str != str.toLowerCase());
  92
  93         searchRange = doc.createRange();
  94         startPt = doc.createRange();
  95         endPt = doc.createRange();
  96
  97         var count = body.childNodes.length;
  98
  99         // Search range in the doc
 100         searchRange.setStart(body,0);
 101         searchRange.setEnd(body, count);
 102
 103         if (!dir) {
 104             if (pt == null) {
 105                 startPt.setStart(body, count);
 106                 startPt.setEnd(body, count);
 107             } else {
 108                 startPt.setStart(pt.startContainer, pt.startOffset);
 109                 startPt.setEnd(pt.startContainer, pt.startOffset);
 110             }
 111             endPt.setStart(body, 0);
 112             endPt.setEnd(body, 0);
 113         } else {
 114             if (pt == null) {
 115                 startPt.setStart(body, 0);
 116                 startPt.setEnd(body, 0);
 117             } else {
 118                 startPt.setStart(pt.endContainer, pt.endOffset);
 119                 startPt.setEnd(pt.endContainer, pt.endOffset);
 120             }
 121             endPt.setStart(body, count);
 122             endPt.setEnd(body, count);
 123         }
 124         // search the doc
 125         var retRange = null;
 126         var selectionRange = null;
 127
 128         if (!wrapped) {
 129             do {
 130                 retRange = finder.Find(str, searchRange, startPt, endPt);
 131                 var keepSearching = false;
 132                 if (retRange) {
 133                     var sc = retRange.startContainer;
 134                     var ec = retRange.endContainer;
 135                     var scp = sc.parentNode;
 136                     var ecp = ec.parentNode;
 137                     var sy1 = abs_point(scp).y;
 138                     var ey2 = abs_point(ecp).y + ecp.offsetHeight;
 139
 140                     startPt = retRange.startContainer.ownerDocument.createRange();
 141                     if (!dir) {
 142                         startPt.setStart(retRange.startContainer, retRange.startOffset);
 143                         startPt.setEnd(retRange.startContainer, retRange.startOffset);
 144                     } else {
 145                         startPt.setStart(retRange.endContainer, retRange.endOffset);
 146                         startPt.setEnd(retRange.endContainer, retRange.endOffset);
 147                     }
 148                     // We want to find a match that is completely
 149                     // visible, otherwise the view will scroll just a
 150                     // bit to fit the selection in completely.
 151                     keepSearching = (dir && sy1 < this.frame.scrollY)
 152                         || (!dir && ey2 >= this.frame.scrollY + this.frame.innerHeight);
 153                 }
 154             } while (retRange && keepSearching);
 155         } else {
 156             retRange = finder.Find(str, searchRange, startPt, endPt);
 157         }
 158
 159         if (retRange) {
 160             this._set_selection(retRange);
 161             selectionRange = retRange.cloneRange();
 162         }
 163
 164         return selectionRange;
 165     },
 166
 167     find: function (str, dir, pt) {
 168         var s = this.top;
 169
 170         if (str == null || str.length == 0)
 171             return;
 172
 173         // Should we wrap this time?
 174         var wrapped = s.wrapped;
 175         var point = pt;
 176         if (s.wrapped == false && s.range == null
 177             && s.search_str == str && s.direction == dir)
 178         {
 179             wrapped = true;
 180             point = null;
 181         }
 182
 183         var match_range = this._highlight_find(str, wrapped, dir, point);
 184
 185         var new_state = {
 186             screenx: this.frame.scrollX,
 187             screeny: this.frame.scrollY,
 188             search_str: str,
 189             wrapped: wrapped,
 190             point: point,
 191             range: match_range,
 192             selection: match_range ? match_range : s.selection,
 193             direction: dir
 194         };
 195         this.states.push(new_state);
 196     },
 197
 198     focus_link: function () {
 199         var sel = this.frame.getSelection(Ci.nsISelectionController.SELECTION_NORMAL);
 200         if (!sel)
 201             return;
 202         var node = sel.focusNode;
 203         if (node == null)
 204             return;
 205         do {
 206             if (node.localName && node.localName.toLowerCase() == "a") {
 207                 if (node.hasAttributes && node.attributes.getNamedItem("href")) {
 208                     // if there is a selection, preserve it.  it is up
 209                     // to the caller to decide whether or not to keep
 210                     // the selection.
 211                     var sel = this.frame.getSelection(
 212                         Ci.nsISelectionController.SELECTION_NORMAL);
 213                     if (sel.rangeCount > 0)
 214                         var stored_selection = sel.getRangeAt(0).cloneRange();
 215                     node.focus();
 216                     if (stored_selection) {
 217                         sel.removeAllRanges();
 218                         sel.addRange(stored_selection);
 219                     }
 220                     return;
 221                 }
 222             }
 223         } while ((node = node.parentNode));
 224     },
 225
 226     collapse_selection: function() {
 227         const selctrlcomp = Ci.nsISelectionController;
 228         var sel = this.sel_ctrl.getSelection(selctrlcomp.SELECTION_NORMAL);
 229         if (sel.rangeCount > 0)
 230             sel.getRangeAt(0).collapse(true);
 231     },
 232
 233     handle_input: function (m) {
 234         m._set_selection();
 235         this.find(m._input_text, this.top.direction, this.top.point);
 236         this.restore_state();
 237     },
 238
 239     done: false,
 240
 241     destroy: function () {
 242         if (! this.done) {
 243             this.frame.scrollTo(this.states[0].screenx, this.states[0].screeny);
 244             if (caret_enabled(this.buffer) && this.states[0].caret)
 245                 this._set_selection(this.states[0].caret);
 246             else
 247                 this._clear_selection();
 248         }
 249         minibuffer_input_state.prototype.destroy.call(this);
 250     }
 251 };
 252
 253 function isearch_continue_noninteractively (window, direction) {
 254     var s = new isearch_session(window.minibuffer, direction);
 255     if (window.isearch_last_search)
 256         s.find(window.isearch_last_search, direction, s.top.point);
 257     else
 258         throw "No previous isearch";
 259     window.minibuffer.push_state(s);
 260     s.restore_state();
 261     // if (direction && s.top.point !== null)
 262     //    isearch_continue (window, direction);
 263     isearch_done(window, true);
 264 }
 265
 266 function isearch_continue (window, direction) {
 267     var s = window.minibuffer.current_state;
 268     // if the minibuffer is not open, this command operates in
 269     // non-interactive mode.
 270     if (s == null)
 271         return isearch_continue_noninteractively(window, direction);
 272     if (!(s instanceof isearch_session))
 273         throw "Invalid minibuffer state";
 274     if (s.states.length == 1 && window.isearch_last_search)
 275         s.find(window.isearch_last_search, direction, s.top.point);
 276     else
 277         s.find(s.top.search_str, direction, s.top.range);
 278     return s.restore_state();
 279 }
 280
 281 interactive("isearch-continue-forward",
 282     "Continue the last isearch, forward.",
 283     function (I) { isearch_continue(I.window, true); });
 284
 285 interactive("isearch-continue-backward",
 286     "Continue the last isearch, backward.",
 287     function (I) { isearch_continue(I.window, false); });
 288
 289 function isearch_start (window, direction) {
 290     var s = new isearch_session(window.minibuffer, direction);
 291     window.minibuffer.push_state(s);
 292     s.restore_state();
 293 }
 294
 295 interactive("isearch-forward",
 296     "Start interactive text search, forward from point.",
 297     function (I) { isearch_start(I.window, true); });
 298
 299 interactive("isearch-backward",
 300     "Start interactive text search, backwards from point.",
 301     function (I) { isearch_start(I.window, false); });
 302
 303 function isearch_backspace (window) {
 304     var s = window.minibuffer.current_state;
 305     if (!(s instanceof isearch_session))
 306         throw "Invalid minibuffer state";
 307     if (s.states.length > 1)
 308         s.states.pop();
 309     s.restore_state();
 310 }
 311 interactive("isearch-backspace", null,
 312             function (I) { isearch_backspace(I.window); });
 313
 314 function isearch_done (window, keep_selection) {
 315     var s = window.minibuffer.current_state;
 316     if (!(s instanceof isearch_session))
 317         throw "Invalid minibuffer state";
 318     s.sel_ctrl.setDisplaySelection(Ci.nsISelectionController.SELECTION_NORMAL);
 319
 320     // Prevent focus from being reverted
 321     window.minibuffer.saved_focused_element = null;
 322     window.minibuffer.saved_focused_window = null;
 323
 324     s.done = true;
 325
 326     window.minibuffer.pop_state();
 327     window.isearch_last_search = s.top.search_str;
 328     s.focus_link();
 329     if (! isearch_keep_selection && ! keep_selection)
 330         s.collapse_selection();
 331 }
 332 interactive("isearch-done", null,
 333             function (I) { isearch_done(I.window); });
 334
 335 provide("isearch");