mark-selection.js

!function(mod){"object"==typeof exports&&"object"==typeof module?mod(require("../../lib/codemirror")):"function"==typeof define&&define.amd?define(["../../lib/codemirror"],mod):mod(CodeMirror)}(function(CodeMirror){"use strict";function onCursorActivity(cm){cm.state.markedSelection&&cm.operation(function(){update(cm)})}function onChange(cm){cm.state.markedSelection&&cm.state.markedSelection.length&&cm.operation(function(){clear(cm)})}CodeMirror.defineOption("styleSelectedText",!1,function(cm,val,old){var prev=old&&old!=CodeMirror.Init;val&&!prev?(cm.state.markedSelection=[],cm.state.markedSelectionStyle="string"==typeof val?val:"CodeMirror-selectedtext",reset(cm),cm.on("cursorActivity",onCursorActivity),cm.on("change",onChange)):!val&&prev&&(cm.off("cursorActivity",onCursorActivity),cm.off("change",onChange),clear(cm),cm.state.markedSelection=cm.state.markedSelectionStyle=null)});var CHUNK_SIZE=8,Pos=CodeMirror.Pos,cmp=CodeMirror.cmpPos;function coverRange(cm,from,to,addAt){if(0!=cmp(from,to))for(var array=cm.state.markedSelection,cls=cm.state.markedSelectionStyle,line=from.line;;){var start=line==from.line?from:Pos(line,0),endLine=line+CHUNK_SIZE,atEnd=endLine>=to.line,end=atEnd?to:Pos(endLine,0),mark=cm.markText(start,end,{className:cls});if(null==addAt?array.push(mark):array.splice(addAt++,0,mark),atEnd)break;line=endLine}}function clear(cm){for(var array=cm.state.markedSelection,i=0;i<array.length;++i)array[i].clear();array.length=0}function reset(cm){clear(cm);for(var ranges=cm.listSelections(),i=0;i<ranges.length;i++)coverRange(cm,ranges[i].from(),ranges[i].to())}function update(cm){if(!cm.somethingSelected())return clear(cm);if(cm.listSelections().length>1)return reset(cm);var from=cm.getCursor("start"),to=cm.getCursor("end"),array=cm.state.markedSelection;if(!array.length)return coverRange(cm,from,to);var coverStart=array[0].find(),coverEnd=array[array.length-1].find();if(!coverStart||!coverEnd||to.line-from.line<=CHUNK_SIZE||cmp(from,coverEnd.to)>=0||cmp(to,coverStart.from)<=0)return reset(cm);for(;cmp(from,coverStart.from)>0;)array.shift().clear(),coverStart=array[0].find();for(cmp(from,coverStart.from)<0&&(coverStart.to.line-from.line<CHUNK_SIZE?(array.shift().clear(),coverRange(cm,from,coverStart.to,0)):coverRange(cm,from,coverStart.from,0));cmp(to,coverEnd.to)<0;)array.pop().clear(),coverEnd=array[array.length-1].find();cmp(to,coverEnd.to)>0&&(to.line-coverEnd.from.line<CHUNK_SIZE?(array.pop().clear(),coverRange(cm,coverEnd.from,to)):coverRange(cm,coverEnd.to,to))}});