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<body>
<div id="content">
<h1 class="title">DOM Cursor</h1>
<div id="table-of-contents">
<h2>Table of Contents</h2>
<div id="text-table-of-contents">
<ul>
<li><a href="#orga678619">1. License and Copyright</a></li>
<li><a href="#orgd81e23e">2. Examples</a></li>
<li><a href="#org20889ec">3. DOMCursor Class</a></li>
<li><a href="#org0e5550c">4. EmptyDOMCursor Class</a></li>
<li><a href="#org1bef521">5. MutableDOMCursor Class</a></li>
<li><a href="#org7ba6faf">6. Utilities</a></li>
<li><a href="#orgf9a7ea9">7. Node location routines</a></li>
<li><a href="#org037c8ed">8. Settings</a></li>
</ul>
</div>
</div>
<p>
Filtered cursoring on DOM trees. DOMCursors can move forwards or backwards, by node or by character, with settable filters that can seamlessly skip over parts of the DOM.
</p>
<p>
This readme file is also the code.
</p>
<div id="outline-container-orga678619" class="outline-2">
<h2 id="orga678619"><span class="section-number-2">1</span> License and Copyright</h2>
<div class="outline-text-2" id="text-1">
<p>
Copyright (C) 2020, Bill Burdick, Roy Riggs, TEAM CTHULHU
Licensed with ZLIB license.
</p>
<p>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
</p>
<p>
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
</p>
<ol class="org-ol">
<li>The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.</li>
<li>Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.</li>
<li>This notice may not be removed or altered from any source distribution.</li>
</ol>
</div>
</div>
<div id="outline-container-orgd81e23e" class="outline-2">
<h2 id="orgd81e23e"><span class="section-number-2">2</span> Examples</h2>
<div class="outline-text-2" id="text-2">
<p>
Here are some examples. In Leisure, I use it like this, to retrieve text from the page (scroll down to see docs on these methods, by the way):
</p>
<div class="org-src-container">
<pre class="src src-typescript"><span class="org-keyword">function</span> <span class="org-function-name">filterOrg</span>(<span class="org-variable-name">c</span>: <span class="org-type">DOMCursor</span>) {
<span class="org-keyword">return</span> c.<span class="org-function-name">addFilter</span>((n)<span class="org-keyword">=></span> (n.node.nodeType == 1 && n.<span class="org-function-name">hasAttribute</span>(<span class="org-string">'data-noncontent'</span>) && <span class="org-string">'skip'</span>) || <span class="org-constant">true</span>)
}
<span class="org-keyword">function</span> <span class="org-function-name">domCursor</span>(<span class="org-variable-name">node</span>, <span class="org-variable-name">pos</span>) {<span class="org-keyword">return</span> <span class="org-function-name">filterOrg</span>(<span class="org-keyword">new</span> <span class="org-type">DOMCursor</span>(node, pos))}
<span class="org-comment-delimiter">// </span><span class="org-comment">full text for node</span>
<span class="org-keyword">function</span> <span class="org-function-name">getOrgText</span>(<span class="org-variable-name">node</span>: <span class="org-type">Node</span>) {
<span class="org-keyword">return</span> <span class="org-function-name">domCursor</span>(node.firstChild, 0)
.<span class="org-function-name">mutable</span>()
.<span class="org-function-name">filterTextNodes</span>()
.<span class="org-function-name">filterParent</span>(node)
.<span class="org-function-name">getText</span>()
}
</pre>
</div>
<p>
And like this for cursor movement. Once you have the cursor, you can use forwardChar, backwardChar, forwardLine, backwardLine to move it around:
</p>
<div class="org-src-container">
<pre class="src src-typescript"><span class="org-keyword">function</span> <span class="org-function-name">domCursorForCaret</span>(<span class="org-variable-name">end</span>) {
<span class="org-keyword">const</span> <span class="org-variable-name">sel</span> = <span class="org-function-name">getSelection</span>()
<span class="org-keyword">var</span> <span class="org-variable-name">c</span> = sel.<span class="org-keyword">type</span> == <span class="org-string">'None'</span> ? emptyDOMCursor
: end ? <span class="org-function-name">domCursor</span>(sel.focusNode, sel.focusOffset)
: <span class="org-function-name">domCursor</span>(sel.anchorNode, sel.anchorOffset)
<span class="org-keyword">if</span> (!c.<span class="org-function-name">isEmpty</span>()) {
c = c
.<span class="org-function-name">mutable</span>()
.<span class="org-function-name">filterVisibleTextNodes</span>()
.<span class="org-function-name">filterParent</span>(sel.focusNode.parentNode)
.<span class="org-function-name">firstText</span>()
<span class="org-keyword">if</span> (c.pos >= c.<span class="org-function-name">text</span>().length) c.<span class="org-function-name">next</span>()
}
<span class="org-keyword">return</span> c
}
</pre>
</div>
</div>
</div>
<div id="outline-container-org20889ec" class="outline-2">
<h2 id="org20889ec"><span class="section-number-2">3</span> DOMCursor Class</h2>
<div class="outline-text-2" id="text-3">
<p>
DOMCursors are immutable – operations on them return new DOMCursors.
There are two ways to get mutabile cursors, sending @mutable() or
sending @withMutations (m)-> …
</p>
<p>
A DOMCursor has a node, a position, a filter, and a type.
</p>
<ul class="org-ul">
<li>node: like with ranges, a DOM node</li>
<li>position: like with ranges, either the index of a child, for elements, or the index of a character, for text nodes.</li>
<li>filter: a function used by @next() and @prev() to skip over portions of DOM. It returns
<ul class="org-ul">
<li>truthy: to accept a node but its children are still filtered</li>
<li>falsey: to reject a node but its children are still filtered</li>
<li>'skip': to skip a node and its children</li>
<li>'quit': to end to make @next() or @prev() return an empty DOMCursor</li>
</ul></li>
<li>type: 'empty', 'text', or 'element'</li>
</ul>
<div class="org-src-container">
<pre class="src src-typescript"><span class="org-keyword">type</span> <span class="org-type">Filter</span> = (n: <span class="org-type">DOMCursor</span>)<span class="org-keyword">=></span> <span class="org-typescript-primitive">any</span>
<span class="org-keyword">function</span> <span class="org-function-name">differentLines</span>(<span class="org-variable-name">pos1</span>: <span class="org-type">DOMRect</span>, <span class="org-variable-name">pos2</span>: <span class="org-type">DOMRect</span>) {
<span class="org-keyword">return</span> (pos1.bottom - 4 <= pos2.top) || (pos2.bottom - 4 <= pos1.top)
}
<span class="org-keyword">function</span> <span class="org-function-name">selectRange</span>(<span class="org-variable-name">r</span>?: <span class="org-type">Range</span>) {
<span class="org-keyword">if</span> (r) {
<span class="org-comment-delimiter">//</span><span class="org-comment">debug("select range", r, new Error('trace').stack)</span>
<span class="org-keyword">const</span> <span class="org-variable-name">sel</span> = <span class="org-function-name">getSelection</span>()
<span class="org-keyword">if</span> (!(sel.rangeCount == 1 && <span class="org-function-name">sameRanges</span>(sel.<span class="org-function-name">getRangeAt</span>(0), r))) {
sel.<span class="org-function-name">setBaseAndExtent</span>(r.startContainer, r.startOffset, r.endContainer, r.endOffset)
}
}
}
<span class="org-keyword">function</span> <span class="org-function-name">differentPosition</span> (<span class="org-variable-name">pos1</span>: <span class="org-type">DOMRect</span>, <span class="org-variable-name">pos2</span>: <span class="org-type">DOMRect</span>) {
<span class="org-keyword">if</span> (<span class="org-function-name">differentLines</span>(pos2, pos1)) <span class="org-keyword">return</span> <span class="org-constant">true</span>
<span class="org-keyword">if</span> (pos1.right == <span class="org-constant">undefined</span> || pos2.right == <span class="org-constant">undefined</span>) {
<span class="org-keyword">return</span> Math.<span class="org-function-name">floor</span>(pos1.left) != Math.<span class="org-function-name">floor</span>(pos2.left)
}
<span class="org-keyword">const</span> <span class="org-variable-name">r1</span> = Math.<span class="org-function-name">floor</span>(pos1.right)
<span class="org-keyword">const</span> <span class="org-variable-name">r2</span> = Math.<span class="org-function-name">floor</span>(pos2.right)
<span class="org-keyword">const</span> <span class="org-variable-name">l1</span> = Math.<span class="org-function-name">floor</span>(pos1.left)
<span class="org-keyword">const</span> <span class="org-variable-name">l2</span> = Math.<span class="org-function-name">floor</span>(pos2.left)
<span class="org-keyword">return</span> (r1 != r2 || l1 != l2) && (r2 < <span class="org-type">l1</span> || <span class="org-type">r1</span> < <span class="org-type">l2</span> || ((<span class="org-type">r1</span> < <span class="org-type">r2</span>) == (<span class="org-type">l1</span> < <span class="org-type">l2</span>) && (<span class="org-type">r1</span> > r2) == (l1 > l2)))
}
<span class="org-keyword">function</span> <span class="org-function-name">getTextPosition</span>(<span class="org-variable-name">textNode</span>: <span class="org-type">Text</span>, <span class="org-variable-name">offset</span>: <span class="org-typescript-primitive">number</span>) {
<span class="org-keyword">var</span> <span class="org-variable-name">r</span>: <span class="org-type">DOMRect</span>
<span class="org-keyword">if</span> (offset < <span class="org-type">textNode</span>.<span class="org-type">length</span>) {
spareRange.<span class="org-function-name">setStart</span>(textNode, offset)
spareRange.<span class="org-function-name">setEnd</span>(textNode, offset + 1)
r = <span class="org-function-name">getClientRect</span>(spareRange)
<span class="org-keyword">if</span> (!r || (r.width == 0 && r.height == 0)) {
spareRange.<span class="org-function-name">selectNodeContents</span>(textNode.parentNode)
<span class="org-keyword">if</span> (spareRange.<span class="org-function-name">getClientRects</span>().length == 0) {
r = (textNode.parentNode <span class="org-keyword">as</span> Element).<span class="org-function-name">getBoundingClientRect</span>()
}
}
} <span class="org-keyword">else</span> {
spareRange.<span class="org-function-name">setStart</span>(textNode, offset)
spareRange.<span class="org-function-name">collapse</span>(<span class="org-constant">true</span>)
r = <span class="org-function-name">getClientRect</span>(spareRange)
}
<span class="org-keyword">if</span> (!r || (r.width == 0 && r.height == 0)) {
<span class="org-keyword">if</span> (offset == 0) textNode.parentNode.<span class="org-function-name">insertBefore</span>(positioner, textNode)
<span class="org-keyword">else</span> <span class="org-keyword">if</span> (offset == textNode.length || textNode.<span class="org-function-name">splitText</span>(offset)) {
textNode.parentNode.<span class="org-function-name">insertBefore</span>(positioner, textNode.nextSibling)
}
spareRange.<span class="org-function-name">selectNode</span>(positioner)
r = spareRange.<span class="org-function-name">getBoundingClientRect</span>()
positioner.parentNode.<span class="org-function-name">removeChild</span>(positioner)
textNode.parentNode.<span class="org-function-name">normalize</span>()
}
<span class="org-keyword">return</span> r
}
<span class="org-comment-delimiter">// </span><span class="org-comment">Thanks to (rangy)[this: https://github.com/timdown/rangy] for the isCollapsed logic</span>
<span class="org-keyword">function</span> <span class="org-function-name">isCollapsed</span>(<span class="org-variable-name">node</span>?: <span class="org-type">Node</span>) {
<span class="org-keyword">if</span> (node) {
<span class="org-keyword">const</span> <span class="org-keyword">type</span> = node.nodeType
<span class="org-keyword">return</span> <span class="org-keyword">type</span> == 7 || <span class="org-comment-delimiter">// </span><span class="org-comment">PROCESSING_INSTRUCTION</span>
<span class="org-keyword">type</span> == 8 || <span class="org-comment-delimiter">// </span><span class="org-comment">COMMENT</span>
(<span class="org-keyword">type</span> == node.TEXT_NODE && ((node <span class="org-keyword">as</span> Text).data == <span class="org-string">''</span> || <span class="org-function-name">isCollapsed</span>(node.parentNode))) ||
/^(script|style)$/i.<span class="org-function-name">test</span>(node.nodeName) ||
(<span class="org-keyword">type</span> == node.ELEMENT_NODE && !(node <span class="org-keyword">as</span> HTMLElement).offsetParent)
}
}
<span class="org-keyword">export</span> <span class="org-keyword">class</span> <span class="org-type">DOMCursor</span> {
node: <span class="org-type">Node</span>
pos: <span class="org-typescript-primitive">number</span>
filter: <span class="org-type">Filter</span>
savedTextPosition: <span class="org-type">DOMRect</span>
<span class="org-keyword">type</span>: <span class="org-typescript-primitive">string</span>
<span class="org-typescript-access-modifier">static</span> debug = <span class="org-constant">false</span>
<span class="org-typescript-access-modifier">static</span> differentLines = differentLines
<span class="org-typescript-access-modifier">static</span> selectRange = selectRange
<span class="org-typescript-access-modifier">static</span> differentPosition = differentPosition
<span class="org-typescript-access-modifier">static</span> emptyDOMCursor: <span class="org-type">EmptyDOMCursor</span>
<span class="org-typescript-access-modifier">static</span> getTextPosition = getTextPosition
<span class="org-typescript-access-modifier">static</span> isCollapsed = isCollapsed
<span class="org-typescript-access-modifier">static</span> MutableDOMCursor: <span class="org-keyword">typeof</span> MutableDOMCursor
<span class="org-keyword">constructor</span>(node: <span class="org-type">Node</span> | Range, pos?: <span class="org-typescript-primitive">number</span> | Filter, filter?: <span class="org-type">Filter</span>) {
<span class="org-keyword">if</span> (node <span class="org-keyword">instanceof</span> <span class="org-type">Range</span>) {
filter = pos <span class="org-keyword">as</span> ()<span class="org-keyword">=></span> <span class="org-typescript-primitive">boolean</span>
<span class="org-typescript-this">this</span>.pos = node.startOffset ?? 0
<span class="org-typescript-this">this</span>.node = node.startContainer
} <span class="org-keyword">else</span> {
<span class="org-typescript-this">this</span>.node = node
<span class="org-typescript-this">this</span>.pos = <span class="org-keyword">typeof</span> pos == <span class="org-string">'number'</span> ? pos : 0
}
<span class="org-typescript-this">this</span>.filter = pos <span class="org-keyword">instanceof</span> <span class="org-type">Function</span> ? pos : filter ?? ((_n: <span class="org-type">DOMCursor</span>)<span class="org-keyword">=></span> <span class="org-constant">true</span>)
<span class="org-typescript-this">this</span>.<span class="org-function-name">computeType</span>()
<span class="org-typescript-this">this</span>.savedTextPosition = <span class="org-constant">null</span>
}
<span class="org-function-name">isCollapsed</span>() { <span class="org-keyword">return</span> !<span class="org-typescript-this">this</span>.<span class="org-function-name">isEmpty</span>() && <span class="org-function-name">isCollapsed</span>(<span class="org-typescript-this">this</span>.node) }
<span class="org-function-name">computeType</span>() {
<span class="org-typescript-this">this</span>.<span class="org-keyword">type</span> = !<span class="org-typescript-this">this</span>.node ? <span class="org-string">'empty'</span>
: <span class="org-typescript-this">this</span>.node.nodeType == <span class="org-typescript-this">this</span>.node.TEXT_NODE ? <span class="org-string">'text'</span>
: <span class="org-string">'element'</span>
<span class="org-keyword">return</span> <span class="org-constant">this</span>
}
<span class="org-function-name">equals</span>(other: <span class="org-type">DOMCursor</span>) { <span class="org-keyword">return</span> <span class="org-typescript-this">this</span>.node == other.node && <span class="org-typescript-this">this</span>.pos == other.pos }
<span class="org-function-name">newPos</span>(node: <span class="org-type">Node</span> | Range, pos: <span class="org-typescript-primitive">number</span>) {
<span class="org-keyword">if</span> (node <span class="org-keyword">instanceof</span> <span class="org-type">Range</span>) <span class="org-keyword">return</span> <span class="org-keyword">new</span> <span class="org-type">DOMCursor</span>(node, <span class="org-typescript-this">this</span>.filter)
<span class="org-keyword">return</span> <span class="org-keyword">new</span> <span class="org-type">DOMCursor</span>(node, pos, <span class="org-typescript-this">this</span>.filter)
}
<span class="org-function-name">toString</span>() { <span class="org-keyword">return</span> <span class="org-string">`DOMCursor(${this.type}, ${this.pos}${this.type == 'text' ? ', ' + this.posString() : ''})`</span> }
<span class="org-function-name">posString</span>() {
<span class="org-keyword">const</span> <span class="org-variable-name">data</span> = <span class="org-typescript-this">this</span>.<span class="org-function-name">text</span>().data
<span class="org-keyword">return</span> <span class="org-string">`${data.substring(0, this.pos)}|${data.substring(this.pos)}`</span>
}
<span class="org-function-name">textPosition</span>() {
<span class="org-keyword">if</span> (<span class="org-typescript-this">this</span>.<span class="org-function-name">isEmpty</span>()) <span class="org-keyword">return</span> <span class="org-constant">null</span>
<span class="org-keyword">return</span> <span class="org-typescript-this">this</span>.savedTextPosition ?? (<span class="org-typescript-this">this</span>.savedTextPosition = <span class="org-function-name">getTextPosition</span>(<span class="org-typescript-this">this</span>.<span class="org-function-name">text</span>(), <span class="org-typescript-this">this</span>.pos))
}
<span class="org-function-name">isDomCaretTextPosition</span>() {
<span class="org-keyword">const</span> <span class="org-variable-name">p</span> = <span class="org-typescript-this">this</span>.<span class="org-function-name">textPosition</span>()
<span class="org-keyword">var</span> <span class="org-variable-name">r</span> = document.<span class="org-function-name">caretRangeFromPoint</span>(p.left, p.top)
<span class="org-keyword">return</span> r.startContainer == <span class="org-typescript-this">this</span>.node && r.startOffset == <span class="org-typescript-this">this</span>.pos
}
<span class="org-comment-delimiter">/** </span><span class="org-comment">returns the character at the position */</span>
<span class="org-function-name">character</span>() {
<span class="org-keyword">const</span> <span class="org-variable-name">p</span> = <span class="org-typescript-this">this</span>.<span class="org-keyword">type</span> == <span class="org-string">'text'</span> ? <span class="org-constant">this</span> : <span class="org-typescript-this">this</span>.<span class="org-function-name">save</span>().<span class="org-function-name">firstText</span>()
<span class="org-keyword">return</span> p.<span class="org-function-name">text</span>().data[p.pos]
}
<span class="org-comment-delimiter">/** </span><span class="org-comment">returns true if the cursor is empty */</span>
<span class="org-function-name">isEmpty</span>() { <span class="org-keyword">return</span> <span class="org-typescript-this">this</span>.<span class="org-keyword">type</span> == <span class="org-string">'empty'</span> }
<span class="org-function-name">setFilter</span>(f: <span class="org-type">Filter</span>) { <span class="org-keyword">return</span> <span class="org-keyword">new</span> <span class="org-type">DOMCursor</span>(<span class="org-typescript-this">this</span>.node, <span class="org-typescript-this">this</span>.pos, f) }
<span class="org-function-name">addFilter</span>(filt: <span class="org-type">Filter</span>) {
<span class="org-keyword">const</span> <span class="org-variable-name">oldFilt</span> = <span class="org-typescript-this">this</span>.filter
<span class="org-keyword">return</span> <span class="org-typescript-this">this</span>.<span class="org-function-name">setFilter</span>((n)<span class="org-keyword">=></span> {
<span class="org-keyword">var</span> <span class="org-variable-name">r1</span> = <span class="org-function-name">oldFilt</span>(n)
<span class="org-keyword">if</span> (([<span class="org-string">'quit'</span>, <span class="org-string">'skip'</span>] <span class="org-keyword">as</span> <span class="org-typescript-primitive">any</span>[]).<span class="org-function-name">includes</span>(r1)) <span class="org-keyword">return</span> r1
<span class="org-keyword">var</span> <span class="org-variable-name">r2</span> = <span class="org-function-name">filt</span>(n)
<span class="org-keyword">if</span> (([<span class="org-string">'quit'</span>, <span class="org-string">'skip'</span>] <span class="org-keyword">as</span> <span class="org-typescript-primitive">any</span>[]).<span class="org-function-name">includes</span>(r2)) <span class="org-keyword">return</span> r2
<span class="org-keyword">return</span> r1 && r2
})
}
<span class="org-comment-delimiter">/** </span><span class="org-comment">moves to the next filtered node */</span>
<span class="org-function-name">next</span>(up?: <span class="org-typescript-primitive">boolean</span>) {
<span class="org-keyword">const</span> <span class="org-variable-name">saved</span> = <span class="org-typescript-this">this</span>.<span class="org-function-name">save</span>()
<span class="org-keyword">var</span> <span class="org-variable-name">n</span> = <span class="org-typescript-this">this</span>.<span class="org-function-name">nodeAfter</span>(up)
<span class="org-keyword">while</span> (!n.<span class="org-function-name">isEmpty</span>()) {
<span class="org-keyword">const</span> <span class="org-variable-name">res</span> = <span class="org-typescript-this">this</span>.<span class="org-function-name">filter</span>(n)
<span class="org-keyword">switch</span> (res) {
<span class="org-keyword">case</span> <span class="org-string">'skip'</span>:
n = n.<span class="org-function-name">nodeAfter</span>(<span class="org-constant">true</span>)
<span class="org-keyword">continue</span>
<span class="org-keyword">case</span> <span class="org-string">'quit'</span>:
<span class="org-keyword">break</span>
<span class="org-keyword">default</span>:
<span class="org-keyword">if</span> (res) <span class="org-keyword">return</span> n
}
n = n.<span class="org-function-name">nodeAfter</span>()
}
<span class="org-keyword">return</span> <span class="org-typescript-this">this</span>.<span class="org-function-name">restore</span>(saved).<span class="org-function-name">emptyNext</span>()
}
<span class="org-comment-delimiter">/** </span><span class="org-comment">moves to the previous filtered node */</span>
<span class="org-function-name">prev</span>(up?: <span class="org-typescript-primitive">boolean</span>) {
<span class="org-keyword">const</span> <span class="org-variable-name">saved</span> = <span class="org-typescript-this">this</span>.<span class="org-function-name">save</span>()
<span class="org-keyword">var</span> <span class="org-variable-name">n</span> = <span class="org-typescript-this">this</span>.<span class="org-function-name">nodeBefore</span>(up)
<span class="org-keyword">while</span> (!n.<span class="org-function-name">isEmpty</span>()) {
<span class="org-keyword">const</span> <span class="org-variable-name">res</span> = <span class="org-typescript-this">this</span>.<span class="org-function-name">filter</span>(n)
<span class="org-keyword">switch</span> (res) {
<span class="org-keyword">case</span> <span class="org-string">'skip'</span>:
n = n.<span class="org-function-name">nodeBefore</span>(<span class="org-constant">true</span>)
<span class="org-keyword">continue</span>
<span class="org-keyword">case</span> <span class="org-string">'quit'</span>:
<span class="org-keyword">break</span>
<span class="org-keyword">default</span>:
<span class="org-keyword">if</span> (res) <span class="org-keyword">return</span> n
}
n = n.<span class="org-function-name">nodeBefore</span>()
}
<span class="org-keyword">return</span> <span class="org-typescript-this">this</span>.<span class="org-function-name">restore</span>(saved).<span class="org-function-name">emptyPrev</span>()
}
<span class="org-comment-delimiter">/** </span><span class="org-comment">returns all of the nodes this cursor finds */</span>
<span class="org-function-name">nodes</span>() {
<span class="org-keyword">const</span> <span class="org-variable-name">result</span> = []
<span class="org-keyword">var</span> <span class="org-variable-name">n</span>: <span class="org-type">DOMCursor</span> = <span class="org-constant">this</span>
<span class="org-keyword">while</span> (!(n = n.<span class="org-function-name">next</span>()).<span class="org-function-name">isEmpty</span>()) {
result.<span class="org-function-name">push</span>(n.node)
}
<span class="org-keyword">return</span> result
}
<span class="org-comment-delimiter">/** </span><span class="org-comment">move the document selection to the current position */</span>
<span class="org-function-name">moveCaret</span>(r?: <span class="org-type">Range</span>) {
<span class="org-keyword">if</span> (!<span class="org-typescript-this">this</span>.<span class="org-function-name">isEmpty</span>()) {
<span class="org-keyword">if</span> (!r) r = document.<span class="org-function-name">createRange</span>()
r.<span class="org-function-name">setStart</span>(<span class="org-typescript-this">this</span>.node, <span class="org-typescript-this">this</span>.pos)
r.<span class="org-function-name">collapse</span>(<span class="org-constant">true</span>)
<span class="org-function-name">selectRange</span>(r)
}
<span class="org-keyword">return</span> <span class="org-constant">this</span>
}
<span class="org-function-name">scrollIntoViewIfNeeded</span>() {
<span class="org-keyword">const</span> <span class="org-variable-name">n</span> = <span class="org-typescript-this">this</span>.node.nodeType == <span class="org-typescript-this">this</span>.node.TEXT_NODE ? <span class="org-typescript-this">this</span>.node.parentNode : <span class="org-typescript-this">this</span>.node;
<span class="org-comment-delimiter">//</span><span class="org-comment">TS doesn't know Element has scrollIntoViewIfNeeded()</span>
(n <span class="org-keyword">as</span> <span class="org-typescript-primitive">any</span>).<span class="org-function-name">scrollIntoViewIfNeeded</span>()
<span class="org-keyword">return</span> <span class="org-constant">this</span>
}
<span class="org-function-name">text</span>() { <span class="org-keyword">return</span> <span class="org-typescript-this">this</span>.node <span class="org-keyword">as</span> Text }
<span class="org-function-name">element</span>() { <span class="org-keyword">return</span> <span class="org-typescript-this">this</span>.node <span class="org-keyword">as</span> Element }
<span class="org-function-name">adjustForNewline</span>() {
<span class="org-keyword">if</span> (<span class="org-typescript-this">this</span>.<span class="org-function-name">isEmpty</span>()) <span class="org-keyword">return</span> <span class="org-constant">this</span>
<span class="org-keyword">const</span> <span class="org-variable-name">s</span> = <span class="org-typescript-this">this</span>.<span class="org-function-name">save</span>()
<span class="org-keyword">var</span> <span class="org-variable-name">n</span>: <span class="org-type">DOMCursor</span> = <span class="org-constant">this</span>
<span class="org-keyword">if</span> (<span class="org-typescript-this">this</span>.pos == 0 && <span class="org-typescript-this">this</span>.<span class="org-function-name">text</span>().data[0] == <span class="org-string">'\n'</span>) {
<span class="org-keyword">while</span> (!n.<span class="org-function-name">isEmpty</span>() && (n = n.<span class="org-function-name">prev</span>()).<span class="org-keyword">type</span> != <span class="org-string">'text'</span>);
<span class="org-keyword">return</span> n.<span class="org-function-name">isEmpty</span>() ? s
: n.<span class="org-function-name">text</span>().data[n.pos - 1] == <span class="org-string">'\n'</span> ? s
: n
}
<span class="org-keyword">if</span> (<span class="org-typescript-this">this</span>.pos == <span class="org-typescript-this">this</span>.<span class="org-function-name">text</span>().length && <span class="org-typescript-this">this</span>.<span class="org-function-name">text</span>().data[<span class="org-typescript-this">this</span>.pos - 1] == <span class="org-string">'\n'</span>) {
<span class="org-keyword">while</span> (!n.<span class="org-function-name">isEmpty</span>() && (n = n.<span class="org-function-name">prev</span>()).<span class="org-keyword">type</span> != <span class="org-string">'text'</span>);
<span class="org-keyword">return</span> n.<span class="org-function-name">text</span>().data[n.pos] == <span class="org-string">'\n'</span> ? s : n
}
<span class="org-keyword">return</span> <span class="org-constant">this</span>
}
<span class="org-comment-delimiter">/** </span><span class="org-comment">create a range between two positions */</span>
<span class="org-function-name">range</span>(other?: <span class="org-type">DOMCursor</span>, r?: <span class="org-type">Range</span>) {
<span class="org-keyword">if</span> (!r) r = document.<span class="org-function-name">createRange</span>()
<span class="org-keyword">if</span> (!other) other = <span class="org-constant">this</span>
r.<span class="org-function-name">setStart</span>(<span class="org-typescript-this">this</span>.node, <span class="org-typescript-this">this</span>.pos)
r.<span class="org-function-name">setEnd</span>(other.node, other.pos)
<span class="org-keyword">return</span> r
}
<span class="org-comment-delimiter">/** </span><span class="org-comment">find the first text node (the 'backwards' argument is optional and if true, indicates to find the first text node behind the cursor). */</span>
<span class="org-function-name">firstText</span>(backwards?: <span class="org-typescript-primitive">boolean</span>) {
<span class="org-keyword">var</span> <span class="org-variable-name">n</span>: <span class="org-type">DOMCursor</span> = <span class="org-constant">this</span>
<span class="org-keyword">while</span> (!n.<span class="org-function-name">isEmpty</span>() && (n.<span class="org-keyword">type</span> != <span class="org-string">'text'</span> || (!backwards && n.pos == n.<span class="org-function-name">text</span>().data.length))) {
n = backwards ? n.<span class="org-function-name">prev</span>() : n.<span class="org-function-name">next</span>()
}
<span class="org-keyword">return</span> n
}
<span class="org-comment-delimiter">/** </span><span class="org-comment">count the characters in the filtered nodes until we get to (node, pos). Includes (node, 0) up to but not including (node, pos) */</span>
<span class="org-function-name">countChars</span>(node: <span class="org-type">Node</span> | DOMCursor, pos?: <span class="org-typescript-primitive">number</span>) {
<span class="org-keyword">const</span> <span class="org-variable-name">start</span> = <span class="org-typescript-this">this</span>.<span class="org-function-name">copy</span>()
<span class="org-keyword">if</span> (node <span class="org-keyword">instanceof</span> <span class="org-type">DOMCursor</span>) {
pos = node.pos
node = node.node
}
<span class="org-keyword">var</span> <span class="org-variable-name">n</span>: <span class="org-type">DOMCursor</span> = <span class="org-constant">this</span>
<span class="org-keyword">var</span> <span class="org-variable-name">tot</span> = 0
<span class="org-keyword">while</span> (!n.<span class="org-function-name">isEmpty</span>() && n.node != node) {
<span class="org-keyword">if</span> (n.<span class="org-keyword">type</span> == <span class="org-string">'text'</span>) tot += n.<span class="org-function-name">text</span>().length
n = n.<span class="org-function-name">next</span>()
}
<span class="org-keyword">if</span> (n.<span class="org-function-name">isEmpty</span>() || n.node != node) <span class="org-keyword">return</span> -1
<span class="org-keyword">if</span> (n.<span class="org-keyword">type</span> == <span class="org-string">'text'</span>) {
tot += pos
<span class="org-keyword">if</span> (start.node == n.node) tot -= start.pos
}
<span class="org-keyword">return</span> tot
}
<span class="org-comment-delimiter">/** </span><span class="org-comment">moves the cursor forward by count characters if contain is true and the final location is 0 then go to the end of the previous text node (node, node.length), if contain is false but containIfSpace is true and the final location is 0 and is also a space, then go to the end of the previous text node (provided we didn't start there). */</span>
<span class="org-function-name">forwardChars</span>(count: <span class="org-typescript-primitive">number</span>, contain?: <span class="org-typescript-primitive">boolean</span>, containIfSpace?: <span class="org-typescript-primitive">boolean</span>) {
<span class="org-keyword">var</span> <span class="org-variable-name">n</span>: <span class="org-type">DOMCursor</span> = <span class="org-constant">this</span>
count += <span class="org-typescript-this">this</span>.pos
<span class="org-keyword">while</span> (!n.<span class="org-function-name">isEmpty</span>() && 0 <= count) {
<span class="org-keyword">if</span> (n.<span class="org-keyword">type</span> == <span class="org-string">'text'</span>) {
<span class="org-keyword">if</span> (count < <span class="org-type">n</span>.<span class="org-type">text</span>().<span class="org-type">length</span>) {
<span class="org-keyword">var</span> <span class="org-variable-name">skipped</span>: <span class="org-type">DOMCursor</span>
<span class="org-keyword">if</span> (count == 0 && (contain || containIfSpace) && (skipped = n.<span class="org-function-name">skipToFrontOfSpace</span>(contain))) <span class="org-keyword">return</span> skipped
<span class="org-keyword">return</span> n.<span class="org-function-name">newPos</span>(n.node, count)
}
count -= n.<span class="org-function-name">text</span>().length
}
n = n.<span class="org-function-name">next</span>()
}
<span class="org-keyword">return</span> n.<span class="org-function-name">emptyNext</span>()
}
<span class="org-function-name">skipToFrontOfSpace</span>(force?: <span class="org-typescript-primitive">boolean</span>) {
<span class="org-keyword">if</span> (force || (<span class="org-typescript-this">this</span>.pos == 0 && <span class="org-typescript-this">this</span>.<span class="org-keyword">type</span> == <span class="org-string">'text'</span> && (<span class="org-string">' \n\r'</span>.<span class="org-function-name">includes</span>(<span class="org-typescript-this">this</span>.<span class="org-function-name">text</span>().data[0])))) {
<span class="org-keyword">var</span> <span class="org-variable-name">n</span> = <span class="org-typescript-this">this</span>.<span class="org-function-name">prev</span>()
<span class="org-keyword">while</span> (n.<span class="org-keyword">type</span> != <span class="org-string">'text'</span>) n = n.<span class="org-function-name">prev</span>()
<span class="org-keyword">return</span> n.<span class="org-function-name">newPos</span>(n.node, n.<span class="org-function-name">text</span>().length)
}
}
<span class="org-comment-delimiter">/** </span><span class="org-comment">returns true if the node is an element and has the attribute or if it is a text node and its parent has the attribute */</span>
<span class="org-function-name">hasAttribute</span>(a: <span class="org-typescript-primitive">string</span>) {
<span class="org-keyword">return</span> <span class="org-typescript-this">this</span>.node && <span class="org-typescript-this">this</span>.node.nodeType == <span class="org-typescript-this">this</span>.node.ELEMENT_NODE && <span class="org-typescript-this">this</span>.<span class="org-function-name">element</span>().<span class="org-function-name">hasAttribute</span>(a)
}
<span class="org-comment-delimiter">/** </span><span class="org-comment">returns the attribute if the node is an element and has the attribute */</span>
<span class="org-function-name">getAttribute</span>(a: <span class="org-typescript-primitive">string</span>) {
<span class="org-keyword">return</span> <span class="org-typescript-this">this</span>.node && <span class="org-typescript-this">this</span>.node.nodeType == <span class="org-typescript-this">this</span>.node.ELEMENT_NODE && <span class="org-typescript-this">this</span>.<span class="org-function-name">element</span>().<span class="org-function-name">getAttribute</span>(a)
}
<span class="org-comment-delimiter">/** </span><span class="org-comment">adds text node filtering to the current filter; the cursor will only find text nodes */</span>
<span class="org-function-name">filterTextNodes</span>() { <span class="org-keyword">return</span> <span class="org-typescript-this">this</span>.<span class="org-function-name">addFilter</span>((n)<span class="org-keyword">=></span> n.<span class="org-keyword">type</span> == <span class="org-string">'text'</span>) }
<span class="org-comment-delimiter">/** </span><span class="org-comment">adds visible text node filtering to the current filter; the cursor will only find visible text nodes */</span>
<span class="org-function-name">filterVisibleNodes</span>() { <span class="org-keyword">return</span> <span class="org-typescript-this">this</span>.<span class="org-function-name">addFilter</span>((n)<span class="org-keyword">=></span> !n.<span class="org-function-name">isCollapsed</span>()) }
<span class="org-comment-delimiter">/** </span><span class="org-comment">adds visible text node filtering to the current filter; the cursor will only find visible text nodes */</span>
<span class="org-function-name">filterVisibleTextNodes</span>() { <span class="org-keyword">return</span> <span class="org-typescript-this">this</span>.<span class="org-function-name">filterTextNodes</span>().<span class="org-function-name">filterVisibleNodes</span>() }
<span class="org-comment-delimiter">/** </span><span class="org-comment">adds parent filtering to the current filter; the cursor will only find nodes that are contained in the parent (or equal to it) */</span>
<span class="org-function-name">filterParent</span>(parent?: <span class="org-type">Node</span>) {
<span class="org-keyword">return</span> !parent ? <span class="org-typescript-this">this</span>.<span class="org-function-name">setFilter</span>((n)<span class="org-keyword">=></span> <span class="org-string">'quit'</span>)
: <span class="org-typescript-this">this</span>.<span class="org-function-name">addFilter</span>((n)<span class="org-keyword">=></span> parent.<span class="org-function-name">contains</span>(n.node) || <span class="org-string">'quit'</span>)
}
<span class="org-comment-delimiter">/** </span><span class="org-comment">adds range filtering to the current filter; the cursor will only find nodes that are contained in the range */</span>
<span class="org-function-name">filterRange</span>(startContainer: <span class="org-type">Range</span> | Node, startOffset?: <span class="org-typescript-primitive">number</span>, endContainer?: <span class="org-type">Node</span>, endOffset?: <span class="org-typescript-primitive">number</span>) {
<span class="org-keyword">var</span> <span class="org-variable-name">start</span>: <span class="org-type">Node</span>
<span class="org-keyword">if</span> (startContainer <span class="org-keyword">instanceof</span> <span class="org-type">Range</span>) {
<span class="org-keyword">const</span> <span class="org-variable-name">r</span> = startContainer
start = r.startContainer
startOffset = r.startOffset
endContainer = r.endContainer
endOffset = r.endOffset
} <span class="org-keyword">else</span> {
start = startContainer
}
<span class="org-keyword">if</span> (startOffset == <span class="org-constant">undefined</span>) <span class="org-keyword">return</span> <span class="org-constant">this</span>
<span class="org-keyword">return</span> <span class="org-typescript-this">this</span>.<span class="org-function-name">addFilter</span>((n)<span class="org-keyword">=></span> {
<span class="org-keyword">const</span> <span class="org-variable-name">startPos</span> = start.<span class="org-function-name">compareDocumentPosition</span>(n.node)
<span class="org-keyword">if</span> (startPos == 0 && startOffset <= n.pos && n.pos <= endOffset) <span class="org-keyword">return</span> <span class="org-constant">true</span>
<span class="org-keyword">if</span> (startPos & <span class="org-typescript-this">this</span>.node.DOCUMENT_POSITION_FOLLOWING) {
<span class="org-keyword">const</span> <span class="org-variable-name">endPos</span> = endContainer.<span class="org-function-name">compareDocumentPosition</span>(n.node)
<span class="org-keyword">if</span> ((endPos == 0 && n.pos <= endOffset) ||
(endPos & <span class="org-typescript-this">this</span>.node.DOCUMENT_POSITION_PRECEDING)) {
<span class="org-keyword">return</span> <span class="org-constant">true</span>
}
}
<span class="org-keyword">return</span> <span class="org-string">'quit'</span>
})
}
<span class="org-comment-delimiter">/** </span><span class="org-comment">gets all of the text at or after the cursor (useful with filtering; see above) */</span>
<span class="org-function-name">getText</span>(len?: <span class="org-typescript-primitive">number</span>) {
len = len ?? Number.MAX_SAFE_INTEGER
<span class="org-keyword">var</span> <span class="org-variable-name">n</span>: <span class="org-type">DOMCursor</span> = <span class="org-typescript-this">this</span>.<span class="org-function-name">mutable</span>().<span class="org-function-name">firstText</span>()
<span class="org-keyword">if</span> (n.<span class="org-function-name">isEmpty</span>()) <span class="org-keyword">return</span> <span class="org-string">''</span>
<span class="org-keyword">var</span> <span class="org-variable-name">t</span> = n.<span class="org-function-name">text</span>().data.<span class="org-function-name">substring</span>(n.pos)
<span class="org-keyword">while</span> (!(n = n.<span class="org-function-name">next</span>()).<span class="org-function-name">isEmpty</span>() && t.length < <span class="org-type">len</span>) {
<span class="org-keyword">if</span> (n.<span class="org-keyword">type</span> == <span class="org-string">'text'</span>) t += n.<span class="org-function-name">text</span>().data
}
<span class="org-keyword">if</span> (t.length > len) <span class="org-keyword">return</span> t.<span class="org-function-name">substring</span>(0, len)
<span class="org-keyword">if</span> (!t.length) <span class="org-keyword">return</span> <span class="org-string">''</span>
<span class="org-keyword">while</span> (n.<span class="org-keyword">type</span> != <span class="org-string">'text'</span>) n = n.<span class="org-function-name">prev</span>()
n = n.<span class="org-function-name">newPos</span>(n.node, n.<span class="org-function-name">text</span>().length)
<span class="org-keyword">while</span> (n.pos > 0 && <span class="org-function-name">reject</span>(n.<span class="org-function-name">filter</span>(n))) n.pos--
<span class="org-keyword">return</span> t.<span class="org-function-name">substring</span>(0, t.length - n.<span class="org-function-name">text</span>().length + n.pos)
}
<span class="org-comment-delimiter">/** </span><span class="org-comment">gets all of the text at or after the cursor (useful with filtering; see above) */</span>
<span class="org-function-name">getTextTo</span>(other: <span class="org-type">DOMCursor</span>) {
<span class="org-keyword">var</span> <span class="org-variable-name">n</span>: <span class="org-type">DOMCursor</span> = <span class="org-typescript-this">this</span>.<span class="org-function-name">mutable</span>().<span class="org-function-name">firstText</span>()
<span class="org-keyword">if</span> (n.<span class="org-function-name">isEmpty</span>()) <span class="org-keyword">return</span> <span class="org-string">''</span>
<span class="org-keyword">var</span> <span class="org-variable-name">t</span> = n.<span class="org-function-name">text</span>().data.<span class="org-function-name">substring</span>(n.pos)
<span class="org-keyword">if</span> (n.node != other.node) {
<span class="org-keyword">while</span> (!(n = n.<span class="org-function-name">next</span>()).<span class="org-function-name">isEmpty</span>()) {
<span class="org-keyword">if</span> (n.<span class="org-keyword">type</span> == <span class="org-string">'text'</span>) t += n.<span class="org-function-name">text</span>().data
<span class="org-keyword">if</span> (n.node == other.node) <span class="org-keyword">break</span>
}
}
<span class="org-keyword">if</span> (!t.length) <span class="org-keyword">return</span> <span class="org-string">''</span>
<span class="org-keyword">while</span> (n.<span class="org-keyword">type</span> != <span class="org-string">'text'</span>) n.<span class="org-function-name">prev</span>()
n = n.<span class="org-function-name">newPos</span>(n.node, n.node == other.node ? other.pos : n.<span class="org-function-name">text</span>().length)
<span class="org-keyword">while</span> (n.pos > 0 && <span class="org-function-name">reject</span>(n.<span class="org-function-name">filter</span>(n))) n.pos--
<span class="org-keyword">return</span> t.<span class="org-function-name">substring</span>(0, t.length - n.<span class="org-function-name">text</span>().length + n.pos)
}
<span class="org-function-name">char</span>() {<span class="org-keyword">return</span> <span class="org-typescript-this">this</span>.<span class="org-keyword">type</span> == <span class="org-string">'text'</span> && <span class="org-typescript-this">this</span>.<span class="org-function-name">text</span>().data[<span class="org-typescript-this">this</span>.pos]}
<span class="org-comment-delimiter">/** </span><span class="org-comment">returns whether the current character is a newline */</span>
<span class="org-function-name">isNL</span>() {<span class="org-keyword">return</span> <span class="org-typescript-this">this</span>.<span class="org-function-name">char</span>() == <span class="org-string">'\n'</span>}
<span class="org-comment-delimiter">/** </span><span class="org-comment">returns whether the current node ends with a newline */</span>
<span class="org-function-name">endsInNL</span>() {<span class="org-keyword">return</span> <span class="org-typescript-this">this</span>.<span class="org-keyword">type</span> == <span class="org-string">'text'</span> && <span class="org-typescript-this">this</span>.<span class="org-function-name">text</span>().data[<span class="org-typescript-this">this</span>.<span class="org-function-name">text</span>().length - 1] == <span class="org-string">'\n'</span>}
<span class="org-comment-delimiter">/** </span><span class="org-comment">moves to the beginning of the node */</span>
<span class="org-function-name">moveToStart</span>() {<span class="org-keyword">return</span> <span class="org-typescript-this">this</span>.<span class="org-function-name">newPos</span>(<span class="org-typescript-this">this</span>.node, 0)}
<span class="org-comment-delimiter">/** </span><span class="org-comment">moves to the beginning of the next node */</span>
<span class="org-function-name">moveToNextStart</span>() {<span class="org-keyword">return</span> <span class="org-typescript-this">this</span>.<span class="org-function-name">next</span>().<span class="org-function-name">moveToStart</span>()}
<span class="org-comment-delimiter">/** </span><span class="org-comment">moves to the textual end the node (1 before the end if the node ends in a newline) */</span>
<span class="org-function-name">moveToEnd</span>() {
<span class="org-keyword">const</span> <span class="org-variable-name">end</span> = <span class="org-typescript-this">this</span>.<span class="org-function-name">text</span>().length - (<span class="org-typescript-this">this</span>.<span class="org-function-name">endsInNL</span>() ? 1 : 0)
<span class="org-keyword">return</span> <span class="org-typescript-this">this</span>.<span class="org-function-name">newPos</span>(<span class="org-typescript-this">this</span>.node, end)
}
<span class="org-comment-delimiter">/** </span><span class="org-comment">moves to the textual end the previous node (1 before the end if the node ends in a newline) */</span>
<span class="org-function-name">moveToPrevEnd</span>() {<span class="org-keyword">return</span> <span class="org-typescript-this">this</span>.<span class="org-function-name">prev</span>().<span class="org-function-name">moveToEnd</span>()}
<span class="org-comment-delimiter">/** </span><span class="org-comment">moves forward until the given function is false or 'found', returning the previous position if the function is false or the current position if the function is 'found' */</span>
<span class="org-function-name">forwardWhile</span>(test: <span class="org-type">Filter</span>) {
<span class="org-keyword">var</span> <span class="org-variable-name">n</span>: <span class="org-type">DOMCursor</span> = <span class="org-typescript-this">this</span>.<span class="org-function-name">immutable</span>()
<span class="org-keyword">var</span> <span class="org-variable-name">prev</span> = n
<span class="org-keyword">var</span> <span class="org-variable-name">t</span>: <span class="org-typescript-primitive">any</span>
<span class="org-keyword">while</span> (n = n.<span class="org-function-name">forwardChar</span>()) {
<span class="org-keyword">if</span> (n.<span class="org-function-name">isEmpty</span>() || !(t = <span class="org-function-name">test</span>(n))) <span class="org-keyword">return</span> prev
<span class="org-keyword">if</span> (t == <span class="org-string">'found'</span>) <span class="org-keyword">return</span> n
prev = n
}
}
<span class="org-comment-delimiter">/** </span><span class="org-comment">checks whether a condition is true until the EOL */</span>
<span class="org-function-name">checkToEndOfLine</span>(test: <span class="org-type">Filter</span>) {
<span class="org-keyword">var</span> <span class="org-variable-name">n</span>: <span class="org-type">DOMCursor</span> = <span class="org-typescript-this">this</span>.<span class="org-function-name">immutable</span>()
<span class="org-keyword">var</span> <span class="org-variable-name">tp</span> = n.<span class="org-function-name">textPosition</span>()
<span class="org-keyword">while</span> (!n.<span class="org-function-name">isEmpty</span>() && <span class="org-function-name">test</span>(n)) {
<span class="org-keyword">if</span> (<span class="org-function-name">differentLines</span>(tp, n.<span class="org-function-name">textPosition</span>())) <span class="org-keyword">return</span> <span class="org-constant">true</span>
n = n.<span class="org-function-name">forwardChar</span>()
}
<span class="org-keyword">return</span> n.<span class="org-function-name">isEmpty</span>()
}
<span class="org-comment-delimiter">/** </span><span class="org-comment">checks whether a condition is true until the EOL */</span>
<span class="org-function-name">checkToStartOfLine</span>(test: <span class="org-type">Filter</span>) {
<span class="org-keyword">var</span> <span class="org-variable-name">n</span>: <span class="org-type">DOMCursor</span> = <span class="org-typescript-this">this</span>.<span class="org-function-name">immutable</span>()
<span class="org-keyword">var</span> <span class="org-variable-name">tp</span> = n.<span class="org-function-name">textPosition</span>()
<span class="org-keyword">while</span> (!n.<span class="org-function-name">isEmpty</span>() && <span class="org-function-name">test</span>(n)) {
<span class="org-keyword">if</span> (<span class="org-function-name">differentLines</span>(tp, n.<span class="org-function-name">textPosition</span>())) <span class="org-keyword">return</span> <span class="org-constant">true</span>
n = n.<span class="org-function-name">backwardChar</span>()
}
<span class="org-keyword">return</span> n.<span class="org-function-name">isEmpty</span>()
}
<span class="org-comment-delimiter">/** </span><span class="org-comment">moves to the end of the current line */</span>
<span class="org-function-name">endOfLine</span>() {
<span class="org-keyword">const</span> <span class="org-variable-name">tp</span> = <span class="org-typescript-this">this</span>.<span class="org-function-name">textPosition</span>()
<span class="org-keyword">return</span> <span class="org-typescript-this">this</span>.<span class="org-function-name">forwardWhile</span>((n)<span class="org-keyword">=></span> !<span class="org-function-name">differentLines</span>(tp, n.<span class="org-function-name">textPosition</span>()))
}
<span class="org-comment-delimiter">/** </span><span class="org-comment">moves to the next line, trying to keep the current screen pixel column. Optionally takes a goalFunc that takes the position's screen pixel column as input and returns -1, 0, or 1 from comparing the input to the an goal column */</span>
<span class="org-function-name">forwardLine</span>(goalFunc: (n: <span class="org-typescript-primitive">number</span>)<span class="org-keyword">=></span> <span class="org-typescript-primitive">any</span>) {
<span class="org-keyword">if</span> (!goalFunc) goalFunc = (_n)<span class="org-keyword">=></span> -1
<span class="org-keyword">var</span> <span class="org-variable-name">line</span> = 0
<span class="org-keyword">var</span> <span class="org-variable-name">tp</span> = <span class="org-typescript-this">this</span>.<span class="org-function-name">textPosition</span>()
<span class="org-keyword">return</span> <span class="org-typescript-this">this</span>.<span class="org-function-name">forwardWhile</span>((n)<span class="org-keyword">=></span> {
<span class="org-keyword">const</span> <span class="org-variable-name">pos</span> = n.<span class="org-function-name">textPosition</span>()
<span class="org-keyword">if</span> (<span class="org-function-name">differentLines</span>(tp, pos)) {
tp = pos
line++
}
<span class="org-keyword">if</span> (line == 1 && <span class="org-function-name">goalFunc</span>(pos.left + 2) > -1) <span class="org-keyword">return</span> <span class="org-string">'found'</span>
<span class="org-keyword">return</span> line != 2
})
}
<span class="org-comment-delimiter">/** </span><span class="org-comment">moves backward until the given function is false or 'found',</span>
<span class="org-comment">returning the previous position if the function is false or the current</span>
<span class="org-comment">position if the function is 'found' */</span>
<span class="org-function-name">backwardWhile</span>(test: <span class="org-type">Filter</span>) {
<span class="org-keyword">var</span> <span class="org-variable-name">n</span>: <span class="org-type">DOMCursor</span> = <span class="org-typescript-this">this</span>.<span class="org-function-name">immutable</span>()
<span class="org-keyword">var</span> <span class="org-variable-name">prev</span> = n
<span class="org-keyword">var</span> <span class="org-variable-name">t</span>: <span class="org-typescript-primitive">any</span>
<span class="org-keyword">while</span> (n = n.<span class="org-function-name">backwardChar</span>()) {
<span class="org-keyword">if</span> (n.<span class="org-function-name">isEmpty</span>() || !(t = <span class="org-function-name">test</span>(n))) <span class="org-keyword">return</span> <span class="org-typescript-this">this</span>.<span class="org-function-name">restore</span>(prev)
<span class="org-keyword">if</span> (t == <span class="org-string">'found'</span>) <span class="org-keyword">return</span> <span class="org-typescript-this">this</span>.<span class="org-function-name">restore</span>(n)
prev = n
}
<span class="org-keyword">return</span> <span class="org-constant">this</span>
}
<span class="org-comment-delimiter">/** </span><span class="org-comment">moves to the start of the current line */</span>
<span class="org-function-name">startOfLine</span>() {
<span class="org-keyword">const</span> <span class="org-variable-name">tp</span> = <span class="org-typescript-this">this</span>.<span class="org-function-name">textPosition</span>()
<span class="org-keyword">return</span> <span class="org-typescript-this">this</span>.<span class="org-function-name">backwardWhile</span>((n)<span class="org-keyword">=></span> !<span class="org-function-name">differentLines</span>(tp, n.<span class="org-function-name">textPosition</span>()))
}
<span class="org-function-name">differentPosition</span>(c: <span class="org-type">DOMCursor</span>) {<span class="org-keyword">return</span> <span class="org-function-name">differentPosition</span>(<span class="org-typescript-this">this</span>.<span class="org-function-name">textPosition</span>(), c.<span class="org-function-name">textPosition</span>())}
<span class="org-function-name">differentLines</span>(c: <span class="org-type">DOMCursor</span>) {<span class="org-keyword">return</span> <span class="org-function-name">differentLines</span>(<span class="org-typescript-this">this</span>.<span class="org-function-name">textPosition</span>(), c.<span class="org-function-name">textPosition</span>())}
<span class="org-comment-delimiter">/** </span><span class="org-comment">moves to the previous line, trying to keep the current screen pixel column. Optionally takes a goalFunc that takes the position's screen pixel column as input and returns -1, 0, or 1 from comparing the input to an internal goal column */</span>
<span class="org-function-name">backwardLine</span>(goalFunc: (n: <span class="org-typescript-primitive">number</span>)<span class="org-keyword">=></span> <span class="org-typescript-primitive">any</span>) {
<span class="org-comment-delimiter">// </span><span class="org-comment">optional goalFunc takes the position's screen pixel column as input</span>
<span class="org-comment-delimiter">// </span><span class="org-comment">It returns -1, 0, or 1, comparing the input to the internal goal column</span>
<span class="org-keyword">if</span> (!goalFunc) goalFunc = (_n)<span class="org-keyword">=></span> -1
<span class="org-keyword">var</span> <span class="org-variable-name">tp</span> = <span class="org-typescript-this">this</span>.<span class="org-function-name">textPosition</span>()
<span class="org-keyword">var</span> <span class="org-variable-name">line</span> = 0
<span class="org-keyword">return</span> (<span class="org-typescript-this">this</span>.<span class="org-function-name">backwardWhile</span>((n: <span class="org-type">DOMCursor</span>)<span class="org-keyword">=></span> {
<span class="org-keyword">const</span> <span class="org-variable-name">pos</span> = n.<span class="org-function-name">textPosition</span>()
<span class="org-keyword">if</span> (<span class="org-function-name">differentLines</span>(tp, pos)) {
tp = pos
line++
}
<span class="org-keyword">if</span> (line == 1 && [-1, 0].<span class="org-function-name">includes</span>(<span class="org-function-name">goalFunc</span>(n.<span class="org-function-name">textPosition</span>().left - 2))) <span class="org-keyword">return</span> <span class="org-string">'found'</span>
<span class="org-keyword">return</span> line != 2
})).<span class="org-function-name">adjustBackward</span>()
}
<span class="org-function-name">adjustBackward</span>() {
<span class="org-keyword">const</span> <span class="org-variable-name">p</span> = <span class="org-typescript-this">this</span>.<span class="org-function-name">textPosition</span>()
<span class="org-keyword">return</span> <span class="org-typescript-this">this</span>.<span class="org-function-name">backwardWhile</span>((n)<span class="org-keyword">=></span> !<span class="org-function-name">differentPosition</span>(p, n.<span class="org-function-name">textPosition</span>()))
}
<span class="org-function-name">forwardChar</span>() {
<span class="org-keyword">if</span> (<span class="org-typescript-this">this</span>.pos + 1 <= <span class="org-typescript-this">this</span>.<span class="org-function-name">text</span>().length) <span class="org-keyword">return</span> <span class="org-typescript-this">this</span>.<span class="org-function-name">newPos</span>(<span class="org-typescript-this">this</span>.node, <span class="org-typescript-this">this</span>.pos + 1)
<span class="org-keyword">var</span> <span class="org-variable-name">n</span>: <span class="org-type">DOMCursor</span> = <span class="org-constant">this</span>
<span class="org-keyword">while</span> (!(n = n.<span class="org-function-name">next</span>()).<span class="org-function-name">isEmpty</span>()) {
<span class="org-keyword">if</span> (n.<span class="org-function-name">text</span>().length != 0) <span class="org-keyword">break</span>
}
<span class="org-keyword">return</span> n
}
<span class="org-function-name">boundedForwardChar</span>() {
<span class="org-keyword">const</span> <span class="org-variable-name">n</span> = <span class="org-typescript-this">this</span>.<span class="org-function-name">save</span>().<span class="org-function-name">forwardChar</span>()
<span class="org-keyword">return</span> n.<span class="org-function-name">isEmpty</span>() ? n.<span class="org-function-name">prev</span>() : n
}
<span class="org-comment-delimiter">/** </span><span class="org-comment">move backward by one character. If spanSpace is true and it moves over a space and ends up at the start of a node, move to the end of the previous node instead. */</span>
<span class="org-function-name">backwardChar</span>(spanSpace?: <span class="org-typescript-primitive">any</span>) {
<span class="org-keyword">var</span> <span class="org-variable-name">p</span>: <span class="org-type">DOMCursor</span> = <span class="org-constant">this</span>
<span class="org-keyword">const</span> <span class="org-variable-name">oldNode</span> = <span class="org-typescript-this">this</span>.node
<span class="org-keyword">while</span> (!p.<span class="org-function-name">isEmpty</span>() && p.pos == 0) p = p.<span class="org-function-name">prev</span>()
<span class="org-keyword">if</span> (!p.<span class="org-function-name">isEmpty</span>()) {
p = p.<span class="org-function-name">newPos</span>(p.node, p.node != oldNode ? p.pos : p.pos - 1)
<span class="org-keyword">if</span> (spanSpace && p.pos == 0 && p.<span class="org-keyword">type</span> == <span class="org-string">'text'</span> && <span class="org-string">' \n\r'</span>.<span class="org-function-name">includes</span>(p.<span class="org-function-name">text</span>().data[0])) {
<span class="org-keyword">return</span> p.<span class="org-function-name">prev</span>()
}
}
<span class="org-keyword">return</span> p
}
<span class="org-function-name">boundedBackwardChar</span>() {
<span class="org-keyword">const</span> <span class="org-variable-name">n</span> = <span class="org-typescript-this">this</span>.<span class="org-function-name">save</span>().<span class="org-function-name">backwardChar</span>()
<span class="org-keyword">return</span> n.<span class="org-function-name">isEmpty</span>() ? n.<span class="org-function-name">next</span>() : n
}
<span class="org-comment-delimiter">/** </span><span class="org-comment">scroll the position into view. Optionally takes a rectangle representing a toolbar at the top of the page (sorry, this is a bit limited at the moment) */</span>
<span class="org-function-name">show</span>(topRect: <span class="org-type">DOMRect</span>) {
<span class="org-keyword">const</span> <span class="org-variable-name">p</span> = <span class="org-typescript-this">this</span>.<span class="org-function-name">textPosition</span>()
<span class="org-keyword">if</span> (p) {
<span class="org-keyword">const</span> <span class="org-variable-name">top</span> = topRect?.width && topRect.top == 0 ? topRect.bottom : 0
<span class="org-keyword">if</span> (p.bottom > window.innerHeight) window.<span class="org-function-name">scrollBy</span>(0, p.bottom - window.innerHeight)
<span class="org-keyword">else</span> <span class="org-keyword">if</span> (p.top < <span class="org-type">top</span>) <span class="org-type">window</span>.<span class="org-type">scrollBy</span>(0, <span class="org-type">p</span>.<span class="org-type">top</span> - <span class="org-type">top</span>)
}
<span class="org-keyword">return</span> <span class="org-constant">this</span>
}
<span class="org-function-name">immutable</span>(): <span class="org-type">DOMCursor</span> {<span class="org-keyword">return</span> <span class="org-constant">this</span>}
<span class="org-comment-delimiter">/** </span><span class="org-comment">call a function with a mutable version of this cursor */</span>
<span class="org-function-name">withMutations</span>(func: <span class="org-type">Filter</span>) {
<span class="org-keyword">const</span> <span class="org-variable-name">m</span> = <span class="org-typescript-this">this</span>.<span class="org-function-name">copy</span>().<span class="org-function-name">mutable</span>()
<span class="org-function-name">func</span>(m)
<span class="org-keyword">return</span> m.<span class="org-function-name">immutable</span>()
}
<span class="org-function-name">mutable</span>() {<span class="org-keyword">return</span> <span class="org-keyword">new</span> <span class="org-type">MutableDOMCursor</span>(<span class="org-typescript-this">this</span>.node, <span class="org-typescript-this">this</span>.pos, <span class="org-typescript-this">this</span>.filter)}
<span class="org-function-name">save</span>(): <span class="org-type">DOMCursor</span> {<span class="org-keyword">return</span> <span class="org-constant">this</span>}
<span class="org-function-name">restore</span>(c: <span class="org-type">DOMCursor</span>) {<span class="org-keyword">return</span> c.<span class="org-function-name">immutable</span>()}
<span class="org-function-name">copy</span>(): <span class="org-type">DOMCursor</span> {<span class="org-keyword">return</span> <span class="org-constant">this</span>}
<span class="org-comment-delimiter">/** </span><span class="org-comment">low level method that moves to the unfiltered node after the current one */</span>
<span class="org-function-name">nodeAfter</span>(up?: <span class="org-typescript-primitive">any</span>) {
<span class="org-keyword">var</span> <span class="org-variable-name">node</span> = <span class="org-typescript-this">this</span>.node
<span class="org-keyword">var</span> <span class="org-variable-name">pos</span> = <span class="org-typescript-this">this</span>.pos
<span class="org-keyword">while</span> (node) {
<span class="org-keyword">if</span> (node.nodeType == node.ELEMENT_NODE && !up && pos < <span class="org-type">node</span>.<span class="org-type">childNodes</span>.<span class="org-type">length</span>) {
<span class="org-keyword">return</span> <span class="org-typescript-this">this</span>.<span class="org-function-name">newPos</span>(node.childNodes[pos], 0)
} <span class="org-keyword">else</span> <span class="org-keyword">if</span> (node.nextSibling) {
<span class="org-keyword">return</span> <span class="org-typescript-this">this</span>.<span class="org-function-name">newPos</span>(node.nextSibling, 0)
} <span class="org-keyword">else</span> <span class="org-keyword">if</span> (!node.parentNode) <span class="org-keyword">break</span>
up = <span class="org-constant">true</span>
pos = 0
<span class="org-keyword">for</span> (<span class="org-keyword">const</span> <span class="org-variable-name">c</span> <span class="org-keyword">of</span> node.parentNode.childNodes) {
<span class="org-keyword">if</span> (c == node) <span class="org-keyword">break</span>
pos++
}
node = node.parentNode
}
<span class="org-keyword">return</span> <span class="org-typescript-this">this</span>.<span class="org-function-name">emptyNext</span>()
}
<span class="org-comment-delimiter">/** </span><span class="org-comment">returns an empty cursor whose prev is the current node */</span>
<span class="org-function-name">emptyNext</span>() {
<span class="org-comment-delimiter">// </span><span class="org-comment">return an empty next node where</span>
<span class="org-comment-delimiter">// </span><span class="org-comment">prev returns this node</span>
<span class="org-comment-delimiter">// </span><span class="org-comment">next returns the same empty node</span>
<span class="org-keyword">return</span> {
__proto__: emptyDOMCursor,
filter: <span class="org-typescript-this">this</span>.filter,
prev: (up)<span class="org-keyword">=></span> up ? <span class="org-typescript-this">this</span>.<span class="org-function-name">prev</span>(up) : <span class="org-constant">this</span>,
nodeBefore: (up)<span class="org-keyword">=></span> up ? <span class="org-typescript-this">this</span>.<span class="org-function-name">nodeBefore</span>(up) : <span class="org-constant">this</span>,
} <span class="org-keyword">as</span> <span class="org-typescript-primitive">unknown</span> <span class="org-keyword">as</span> DOMCursor
}
<span class="org-comment-delimiter">/** </span><span class="org-comment">low level method that moves to the unfiltered node before the current one */</span>
<span class="org-function-name">nodeBefore</span>(up?: <span class="org-typescript-primitive">any</span>) {
<span class="org-keyword">var</span> <span class="org-variable-name">node</span> = <span class="org-typescript-this">this</span>.node
<span class="org-keyword">while</span> (node) {
<span class="org-keyword">var</span> <span class="org-variable-name">newNode</span>: <span class="org-type">Node</span>
<span class="org-keyword">if</span> (node.nodeType == node.ELEMENT_NODE && !up && node.childNodes.length) {
newNode = node.childNodes[node.childNodes.length - 1]
} <span class="org-keyword">else</span> <span class="org-keyword">if</span> (node.previousSibling) {
newNode = node.previousSibling
} <span class="org-keyword">else</span> {
up = <span class="org-constant">true</span>
node = node.parentNode
<span class="org-keyword">continue</span>
}
<span class="org-keyword">return</span> <span class="org-typescript-this">this</span>.<span class="org-function-name">newPos</span>(
newNode,
newNode.nodeType == node.ELEMENT_NODE ? (newNode <span class="org-keyword">as</span> Element).childNodes.length
: newNode.nodeType == node.TEXT_NODE ? (newNode <span class="org-keyword">as</span> Text).length
: 0)
}
<span class="org-keyword">return</span> <span class="org-typescript-this">this</span>.<span class="org-function-name">emptyPrev</span>()
}
<span class="org-comment-delimiter">/** </span><span class="org-comment">returns an empty cursor whose next is the current node */</span>
<span class="org-function-name">emptyPrev</span>() {
<span class="org-comment-delimiter">// </span><span class="org-comment">return an empty prev node where</span>
<span class="org-comment-delimiter">// </span><span class="org-comment">next returns this node</span>
<span class="org-comment-delimiter">// </span><span class="org-comment">prev returns the same empty node</span>
<span class="org-keyword">return</span> {