bililiteRange is a javascript library that abstracts text selection and replacement.
此脚本不应直接安装，它是一个供其他脚本使用的外部库。如果您需要使用该库，请在脚本元属性加入：// @require https://update.greasyfork.org/scripts/24818/1157718/bililiteRange.js
'use strict';
let bililiteRange; // create one global variable
(function(){
const datakey = Symbol(); // use as the key to modify elements.
bililiteRange = function(el){
var ret;
if (el.setSelectionRange){
// Element is an input or textarea
// note that some input elements do not allow selections
try{
el.selectionStart = el.selectionStart;
ret = new InputRange();
}catch(e){
ret = new NothingRange();
}
}else{
// Standards, with any other kind of element
ret = new W3CRange();
}
ret._el = el;
// determine parent document, as implemented by John McLear <john@mclear.co.uk>
ret._doc = el.ownerDocument;
ret._win = ret._doc.defaultView;
ret._bounds = [0, ret.length];
if (!(el[datakey])){ // we haven't processed this element yet
const data = createDataObject (el);
startupHooks.forEach ( hook => hook (el, ret, data) );
}
return ret;
}
bililiteRange.version = 3.2;
const startupHooks = new Set();
bililiteRange.addStartupHook = fn => startupHooks.add(fn);
startupHooks.add (trackSelection);
startupHooks.add (fixInputEvents);
startupHooks.add (correctNewlines);
// selection tracking. We want clicks to set the selection to the clicked location but tabbing in or element.focus() should restore
// the selection to what it was.
// There's no good way to do this. I just assume that a mousedown (or a drag and drop
// into the element) within 100 ms of the focus event must have caused the focus, and
// therefore we should not restore the selection.
function trackSelection (element, range, data){
data.selection = [0,0];
range.listen('focusout', evt => data.selection = range._nativeSelection() );
range.listen('mousedown', evt => data.mousetime = evt.timeStamp );
range.listen('drop', evt => data.mousetime = evt.timeStamp );
range.listen('focus', evt => {
if ('mousetime' in data && evt.timeStamp - data.mousetime < 100) return;
range._nativeSelect(range._nativeRange(data.selection))
});
}
function fixInputEvents (element, range, data){
// DOM 3 input events, https://www.w3.org/TR/input-events-1/
// have a data field with the text inserted, but that isn't enough to fully describe the change;
// we need to know the old text (or at least its length)
// and *where* the new text was inserted.
// So we enhance input events with that information.
// the "newText" should always be the same as the 'data' field, if it is defined
data.oldText = range.all();
data.liveRanges = new Set();
range.listen('input', evt => {
const newText = range.all();
if (!evt.bililiteRange){
evt.bililiteRange = diff (data.oldText, newText);
if (evt.bililiteRange.unchanged){
// no change. Assume that whatever happened, happened at the selection point (and use whatever data the browser gives us).
evt.bililiteRange.start = range.clone().bounds('selection')[1] - (evt.data || '').length;
}
}
data.oldText = newText;
// Also update live ranges on this element
data.liveRanges.forEach( rng => {
const start = evt.bililiteRange.start;
const oldend = start + evt.bililiteRange.oldText.length;
const newend = start + evt.bililiteRange.newText.length;
// adjust bounds; this tries to emulate the algorithm that Microsoft Word uses for bookmarks
let [b0, b1] = rng.bounds();
if (b0 <= start){
// no change
}else if (b0 > oldend){
b0 += newend - oldend;
}else{
b0 = newend;
}
if (b1 < start){
// no change
}else if (b1 >= oldend){
b1 += newend - oldend;
}else{
b1 = start;
}
rng.bounds([b0, b1]);
})
});
}
function diff (oldText, newText){
// Try to find the changed text, assuming it was a continuous change
if (oldText == newText){
return {
unchanged: true,
start: 0,
oldText,
newText
}
}
const oldlen = oldText.length;
const newlen = newText.length;
for (var i = 0; i < newlen && i < oldlen; ++i){
if (newText.charAt(i) != oldText.charAt(i)) break;
}
const start = i;
for (i = 0; i < newlen && i < oldlen; ++i){
let newpos = newlen-i-1, oldpos = oldlen-i-1;
if (newpos < start || oldpos < start) break;
if (newText.charAt(newpos) != oldText.charAt(oldpos)) break;
}
const oldend = oldlen-i;
const newend = newlen-i;
return {
start,
oldText: oldText.slice(start, oldend),
newText: newText.slice(start, newend)
}
};
bililiteRange.diff = diff; // expose
function correctNewlines (element, range, data){
// we need to insert newlines rather than create new elements, so character-based calculations work
range.listen('paste', evt => {
if (evt.defaultPrevented) return;
// windows adds \r's to clipboard!
range.clone().bounds('selection').
text(evt.clipboardData.getData("text/plain").replace(/\r/g,''), {inputType: 'insertFromPaste'}).
bounds('endbounds').
select().
scrollIntoView();
evt.preventDefault();
});
range.listen('keydown', function(evt){
if (evt.ctrlKey || evt.altKey || evt.shiftKey || evt.metaKey) return;
if (evt.defaultPrevented) return;
if (evt.key == 'Enter'){
range.clone().bounds('selection').
text('\n', {inputType: 'insertLineBreak'}).
bounds('endbounds').
select().
scrollIntoView();
evt.preventDefault();
}
});
}
// convenience function for defining input events
function inputEventInit(type, oldText, newText, start, inputType){
return {
type,
inputType,
data: newText,
bubbles: true,
bililiteRange: {
unchanged: (oldText == newText),
start,
oldText,
newText
}
};
}
// base class
function Range(){}
Range.prototype = {
// allow use of range[0] and range[1] for start and end of bounds
get 0(){
return this.bounds()[0];
},
set 0(x){
this.bounds([x, this[1]]);
return x;
},
get 1(){
return this.bounds()[1];
},
set 1(x){
this.bounds([this[0], x]);
return x;
},
all: function(text){
if (arguments.length){
return this.bounds('all').text(text, {inputType: 'insertReplacementText'});
}else{
return this._el[this._textProp];
}
},
bounds: function(s){
if (typeof s === 'number'){
this._bounds = [s,s];
}else if (bililiteRange.bounds[s]){
this.bounds(bililiteRange.bounds[s].apply(this, arguments));
}else if (s && s.bounds){
this._bounds = s.bounds(); // copy bounds from an existing range
}else if (s){
this._bounds = s; // don't do error checking now; things may change at a moment's notice
}else{
// constrain bounds now
var b = [
Math.max(0, Math.min (this.length, this._bounds[0])),
Math.max(0, Math.min (this.length, this._bounds[1]))
];
b[1] = Math.max(b[0], b[1]);
return b;
}
return this; // allow for chaining
},
clone: function(){
return bililiteRange(this._el).bounds(this.bounds());
},
get data(){
return this._el[datakey];
},
dispatch: function(opts = {}){
var event = new Event (opts.type, opts);
event.view = this._win;
for (let prop in opts) try { event[prop] = opts[prop] } catch(e){}; // ignore read-only errors for properties that were copied in the previous line
this._el.dispatchEvent(event); // note that the event handlers will be called synchronously, before the "return this;"
return this;
},
get document() {
return this._doc;
},
dontlisten: function (type, func = console.log, target){
target ??= this._el;
target.removeEventListener(type, func);
return this;
},
get element() {
return this._el
},
get length() {
return this._el[this._textProp].length;
},
live (on = true){
this.data.liveRanges[on ? 'add' : 'delete'](this);
return this;
},
listen: function (type, func = console.log, target){
target ??= this._el;
target.addEventListener(type, func);
return this;
},
scrollIntoView() {
var top = this.top();
// note that for TEXTAREA's, this.top() will do the scrolling and the following is irrelevant.
// scroll into position if necessary
if (this._el.scrollTop > top || this._el.scrollTop+this._el.clientHeight < top){
this._el.scrollTop = top;
}
return this;
},
select: function(){
var b = this.data.selection = this.bounds();
if (this._el === this._doc.activeElement){
// only actually select if this element is active!
this._nativeSelect(this._nativeRange(b));
}
this.dispatch({type: 'select', bubbles: true});
return this; // allow for chaining
},
selection: function(text){
if (arguments.length){
return this.bounds('selection').text(text).bounds('endbounds').select();
}else{
return this.bounds('selection').text();
}
},
sendkeys: function (text){
this.data.sendkeysOriginalText = this.text();
this.data.sendkeysBounds = undefined;
function simplechar (rng, c){
if (/^{[^}]*}$/.test(c)) c = c.slice(1,-1); // deal with unknown {key}s
rng.text(c).bounds('endbounds');
}
text.replace(/{[^}]*}|[^{]+|{/g, part => (bililiteRange.sendkeys[part] || simplechar)(this, part, simplechar) );
this.bounds(this.data.sendkeysBounds);
this.dispatch({type: 'sendkeys', detail: text});
return this;
},
text: function(text, {inputType = 'insertText'} = {}){
if ( text !== undefined ){
let eventparams = [this.text(), text, this[0], inputType];
this.dispatch (inputEventInit('beforeinput',...eventparams));
this._nativeSetText(text, this._nativeRange(this.bounds()));
this[1] = this[0]+text.length;
this.dispatch (inputEventInit('input',...eventparams));
return this; // allow for chaining
}else{
return this._nativeGetText(this._nativeRange(this.bounds()));
}
},
top: function(){
return this._nativeTop(this._nativeRange(this.bounds()));
},
get window() {
return this._win;
},
wrap: function (n){
this._nativeWrap(n, this._nativeRange(this.bounds()));
return this;
},
};
// allow extensions ala jQuery
bililiteRange.prototype = Range.prototype;
bililiteRange.extend = function(fns){
Object.assign(bililiteRange.prototype, fns);
};
bililiteRange.override = (name, fn) => {
const oldfn = bililiteRange.prototype[name];
bililiteRange.prototype[name] = function(){
const oldsuper = this.super;
this.super = oldfn;
const ret = fn.apply(this, arguments);
this.super = oldsuper;
return ret;
};
}
//bounds functions
bililiteRange.bounds = {
all: function() { return [0, this.length] },
start: function() { return 0 },
end: function() { return this.length },
selection: function() {
if (this._el === this._doc.activeElement){
this.bounds ('all'); // first select the whole thing for constraining
return this._nativeSelection();
}else{
return this.data.selection;
}
},
startbounds: function() { return this[0] },
endbounds: function() { return this[1] },
union: function (name,...rest) {
const b = this.clone().bounds(...rest);
return [ Math.min(this[0], b[0]), Math.max(this[1], b[1]) ];
},
intersection: function (name,...rest) {
const b = this.clone().bounds(...rest);
return [ Math.max(this[0], b[0]), Math.min(this[1], b[1]) ];
}
};
// sendkeys functions
bililiteRange.sendkeys = {
'{tab}': function (rng, c, simplechar){
simplechar(rng, '\t'); // useful for inserting what would be whitespace
},
'{newline}': function (rng){
rng.text('\n', {inputType: 'insertLineBreak'}).bounds('endbounds');
},
'{backspace}': function (rng){
var b = rng.bounds();
if (b[0] == b[1]) rng.bounds([b[0]-1, b[0]]); // no characters selected; it's just an insertion point. Remove the previous character
rng.text('', {inputType: 'deleteContentBackward'}); // delete the characters and update the selection
},
'{del}': function (rng){
var b = rng.bounds();
if (b[0] == b[1]) rng.bounds([b[0], b[0]+1]); // no characters selected; it's just an insertion point. Remove the next character
rng.text('', {inputType: 'deleteContentForward'}).bounds('endbounds'); // delete the characters and update the selection
},
'{rightarrow}': function (rng){
var b = rng.bounds();
if (b[0] == b[1]) ++b[1]; // no characters selected; it's just an insertion point. Move to the right
rng.bounds([b[1], b[1]]);
},
'{leftarrow}': function (rng){
var b = rng.bounds();
if (b[0] == b[1]) --b[0]; // no characters selected; it's just an insertion point. Move to the left
rng.bounds([b[0], b[0]]);
},
'{selectall}': function (rng){
rng.bounds('all');
},
'{selection}': function (rng){
// insert the characters without the sendkeys processing
rng.text(rng.data.sendkeysOriginalText).bounds('endbounds');
},
'{mark}': function (rng){
rng.data.sendkeysBounds = rng.bounds();
},
'{ctrl-Home}': (rng, c, simplechar) => rng.bounds('start'),
'{ctrl-End}': (rng, c, simplechar) => rng.bounds('end')
};
// Synonyms from the DOM standard (http://www.w3.org/TR/DOM-Level-3-Events-key/)
bililiteRange.sendkeys['{Enter}'] = bililiteRange.sendkeys['{enter}'] = bililiteRange.sendkeys['{newline}'];
bililiteRange.sendkeys['{Backspace}'] = bililiteRange.sendkeys['{backspace}'];
bililiteRange.sendkeys['{Delete}'] = bililiteRange.sendkeys['{del}'];
bililiteRange.sendkeys['{ArrowRight}'] = bililiteRange.sendkeys['{rightarrow}'];
bililiteRange.sendkeys['{ArrowLeft}'] = bililiteRange.sendkeys['{leftarrow}'];
// an input element in a standards document. "Native Range" is just the bounds array
function InputRange(){}
InputRange.prototype = new Range();
InputRange.prototype._textProp = 'value';
InputRange.prototype._nativeRange = function(bounds) {
return bounds || [0, this.length];
};
InputRange.prototype._nativeSelect = function (rng){
this._el.setSelectionRange(rng[0], rng[1]);
};
InputRange.prototype._nativeSelection = function(){
return [this._el.selectionStart, this._el.selectionEnd];
};
InputRange.prototype._nativeGetText = function(rng){
return this._el.value.substring(rng[0], rng[1]);
};
InputRange.prototype._nativeSetText = function(text, rng){
var val = this._el.value;
this._el.value = val.substring(0, rng[0]) + text + val.substring(rng[1]);
};
InputRange.prototype._nativeEOL = function(){
this.text('\n');
};
InputRange.prototype._nativeTop = function(rng){
if (rng[0] == 0) return 0; // the range starts at the top
const el = this._el;
if (el.nodeName == 'INPUT') return 0;
const text = el.value;
const selection = [el.selectionStart, el.selectionEnd];
// hack from https://code.google.com/archive/p/proveit-js/source/default/source, highlightLengthAtIndex function
// note that this results in the element being scrolled; the actual number returned is irrelevant
el.value = text.slice(0, rng[0]);
el.scrollTop = Number.MAX_SAFE_INTEGER;
el.value = text;
el.setSelectionRange(...selection);
return el.scrollTop;
}
InputRange.prototype._nativeWrap = function() {throw new Error("Cannot wrap in a text element")};
function W3CRange(){}
W3CRange.prototype = new Range();
W3CRange.prototype._textProp = 'textContent';
W3CRange.prototype._nativeRange = function (bounds){
var rng = this._doc.createRange();
rng.selectNodeContents(this._el);
if (bounds){
w3cmoveBoundary (rng, bounds[0], true, this._el);
rng.collapse (true);
w3cmoveBoundary (rng, bounds[1]-bounds[0], false, this._el);
}
return rng;
};
W3CRange.prototype._nativeSelect = function (rng){
this._win.getSelection().removeAllRanges();
this._win.getSelection().addRange (rng);
};
W3CRange.prototype._nativeSelection = function (){
// returns [start, end] for the selection constrained to be in element
var rng = this._nativeRange(); // range of the element to constrain to
if (this._win.getSelection().rangeCount == 0) return [this.length, this.length]; // append to the end
var sel = this._win.getSelection().getRangeAt(0);
return [
w3cstart(sel, rng),
w3cend (sel, rng)
];
};
W3CRange.prototype._nativeGetText = function (rng){
return rng.toString();
};
W3CRange.prototype._nativeSetText = function (text, rng){
rng.deleteContents();
rng.insertNode (this._doc.createTextNode(text));
// Lea Verou's "super dirty fix" to #31
if(text == '\n' && this[1]+1 == this._el.textContent.length) {
// inserting a newline at the end
this._el.innerHTML = this._el.innerHTML + '\n';
}
this._el.normalize(); // merge the text with the surrounding text
};
W3CRange.prototype._nativeEOL = function(){
var rng = this._nativeRange(this.bounds());
rng.deleteContents();
var br = this._doc.createElement('br');
br.setAttribute ('_moz_dirty', ''); // for Firefox
rng.insertNode (br);
rng.insertNode (this._doc.createTextNode('\n'));
rng.collapse (false);
};
W3CRange.prototype._nativeTop = function(rng){
if (this.length == 0) return 0; // no text, no scrolling
if (rng.toString() == ''){
var textnode = this._doc.createTextNode('X');
rng.insertNode (textnode);
}
var startrng = this._nativeRange([0,1]);
var top = rng.getBoundingClientRect().top - startrng.getBoundingClientRect().top;
if (textnode) textnode.parentNode.removeChild(textnode);
return top;
}
W3CRange.prototype._nativeWrap = function(n, rng) {
rng.surroundContents(n);
};
// W3C internals
function nextnode (node, root){
// in-order traversal
// we've already visited node, so get kids then siblings
if (node.firstChild) return node.firstChild;
if (node.nextSibling) return node.nextSibling;
if (node===root) return null;
while (node.parentNode){
// get uncles
node = node.parentNode;
if (node == root) return null;
if (node.nextSibling) return node.nextSibling;
}
return null;
}
function w3cmoveBoundary (rng, n, bStart, el){
// move the boundary (bStart == true ? start : end) n characters forward, up to the end of element el. Forward only!
// if the start is moved after the end, then an exception is raised
if (n <= 0) return;
var node = rng[bStart ? 'startContainer' : 'endContainer'];
if (node.nodeType == 3){
// we may be starting somewhere into the text
n += rng[bStart ? 'startOffset' : 'endOffset'];
}
while (node){
if (node.nodeType == 3){
var length = node.nodeValue.length;
if (n <= length){
rng[bStart ? 'setStart' : 'setEnd'](node, n);
// special case: if we end next to a <br>, include that node.
if (n == length){
// skip past zero-length text nodes
for (var next = nextnode (node, el); next && next.nodeType==3 && next.nodeValue.length == 0; next = nextnode(next, el)){
rng[bStart ? 'setStartAfter' : 'setEndAfter'](next);
}
if (next && next.nodeType == 1 && next.nodeName == "BR") rng[bStart ? 'setStartAfter' : 'setEndAfter'](next);
}
return;
}else{
rng[bStart ? 'setStartAfter' : 'setEndAfter'](node); // skip past this one
n -= length; // and eat these characters
}
}
node = nextnode (node, el);
}
}
var START_TO_START = 0; // from the w3c definitions
var START_TO_END = 1;
var END_TO_END = 2;
var END_TO_START = 3;
// from the Mozilla documentation, for range.compareBoundaryPoints(how, sourceRange)
// -1, 0, or 1, indicating whether the corresponding boundary-point of range is respectively before, equal to, or after the corresponding boundary-point of sourceRange.
// * Range.END_TO_END compares the end boundary-point of sourceRange to the end boundary-point of range.
// * Range.END_TO_START compares the end boundary-point of sourceRange to the start boundary-point of range.
// * Range.START_TO_END compares the start boundary-point of sourceRange to the end boundary-point of range.
// * Range.START_TO_START compares the start boundary-point of sourceRange to the start boundary-point of range.
function w3cstart(rng, constraint){
if (rng.compareBoundaryPoints (START_TO_START, constraint) <= 0) return 0; // at or before the beginning
if (rng.compareBoundaryPoints (END_TO_START, constraint) >= 0) return constraint.toString().length;
rng = rng.cloneRange(); // don't change the original
rng.setEnd (constraint.endContainer, constraint.endOffset); // they now end at the same place
return constraint.toString().length - rng.toString().length;
}
function w3cend (rng, constraint){
if (rng.compareBoundaryPoints (END_TO_END, constraint) >= 0) return constraint.toString().length; // at or after the end
if (rng.compareBoundaryPoints (START_TO_END, constraint) <= 0) return 0;
rng = rng.cloneRange(); // don't change the original
rng.setStart (constraint.startContainer, constraint.startOffset); // they now start at the same place
return rng.toString().length;
}
function NothingRange(){}
NothingRange.prototype = new Range();
NothingRange.prototype._textProp = 'value';
NothingRange.prototype._nativeRange = function(bounds) {
return bounds || [0,this.length];
};
NothingRange.prototype._nativeSelect = function (rng){ // do nothing
};
NothingRange.prototype._nativeSelection = function(){
return [0,0];
};
NothingRange.prototype._nativeGetText = function (rng){
return this._el[this._textProp].substring(rng[0], rng[1]);
};
NothingRange.prototype._nativeSetText = function (text, rng){
var val = this._el[this._textProp];
this._el[this._textProp] = val.substring(0, rng[0]) + text + val.substring(rng[1]);
};
NothingRange.prototype._nativeEOL = function(){
this.text('\n');
};
NothingRange.prototype._nativeTop = function(){
return 0;
};
NothingRange.prototype._nativeWrap = function() {throw new Error("Wrapping not implemented")};
// data for elements, similar to jQuery data, but allows for monitoring with custom events
const monitored = new Set();
function signalMonitor(prop, value, element){
const attr = `data-${prop}`;
element.dispatchEvent(new CustomEvent(attr, {bubbles: true, detail: value}));
try{
element.setAttribute (attr, value); // illegal attribute names will throw. Ignore it
} finally { /* ignore */ }
}
function createDataObject (el){
return el[datakey] = new Proxy(new Data(el), {
set(obj, prop, value) {
obj[prop] = value;
if (monitored.has(prop)) signalMonitor(prop, value, obj.sourceElement);
return true; // in strict mode, 'set' returns a success flag
}
});
}
var Data = function(el) {
Object.defineProperty(this, 'sourceElement', {
value: el
});
}
Data.prototype = {};
// for use with ex options. JSON.stringify(range.data) should return only the options that were
// both defined with bililiteRange.option() *and* actually had a value set on this particular data object.
// JSON.stringify (range.data.all) should return all the options that were defined.
Object.defineProperty(Data.prototype, 'toJSON', {
value: function(){
let ret = {};
for (let key in Data.prototype) if (this.hasOwnProperty(key)) ret[key] = this[key];
return ret;
}
});
Object.defineProperty(Data.prototype, 'all', {
get: function(){
let ret = {};
for (let key in Data.prototype) ret[key] = this[key];
return ret;
}
});
Object.defineProperty(Data.prototype, 'trigger', {
value: function(){
monitored.forEach(prop => signalMonitor (prop, this[prop], this.sourceElement));
}
});
bililiteRange.createOption = function (name, desc = {}){
desc = Object.assign({
enumerable: true, // use these as the defaults
writable: true,
configurable: true
}, Object.getOwnPropertyDescriptor(Data.prototype, name), desc);
if ('monitored' in desc) monitored[desc.monitored ? 'add' : 'delete'](name);
Object.defineProperty(Data.prototype, name, desc);
return Data.prototype[name]; // return the default value
}
})();