Add functions to manage math items within a given container. (#351)

ts/adaptors/HTMLAdaptor.ts

@@ -74,6 +74,7 @@ export interface MinHTMLElement<N, T> {
   /* tslint:disable:jsdoc-require */
   getElementsByTagName(name: string): N[] | HTMLCollectionOf<Element>;
   getElementsByTagNameNS(ns: string, name: string): N[] | HTMLCollectionOf<Element>;
+  contains(child: N | T): boolean;
   appendChild(child: N | T): N | T | Node;
   removeChild(child: N | T): N | T  | Node;
   replaceChild(nnode: N | T, onode: N | T): N | T  | Node;
@@ -254,6 +255,13 @@ AbstractDOMAdaptor<N, T, D> implements MinHTMLAdaptor<N, T, D> {
     return containers;
   }
 
+  /**
+   * @override
+   */
+  public contains(container: N, node: N | T) {
+    return container.contains(node);
+  }
+
   /**
    * @override
    */

ts/adaptors/liteAdaptor.ts

@@ -235,6 +235,16 @@ export class LiteAdaptor extends AbstractDOMAdaptor<LiteElement, LiteText, LiteD
     return containers;
   }
 
+  /**
+   * @override
+   */
+  public contains(container: LiteNode, node: LiteNode | LiteText) {
+    while (node && node !== container) {
+      node = this.parent(node);
+    }
+    return !!node;
+  }
+
   /**
    * @override
    */
@@ -295,6 +305,8 @@ export class LiteAdaptor extends AbstractDOMAdaptor<LiteElement, LiteText, LiteD
     const i = this.childIndex(onode);
     if (i >= 0) {
       onode.parent.children[i] = nnode;
+      nnode.parent = onode.parent;
+      onode.parent = null;
     }
     return onode;
   }

ts/components/startup.ts

@@ -327,19 +327,26 @@ export namespace Startup {
    * TypeseClear() clears all the MathItems from the document.
    */
   export function makeTypesetMethods() {
-    MathJax.typeset = (elements: any = null) => {
+    MathJax.typeset = (elements: any[] = null) => {
       document.options.elements = elements;
       document.reset();
       document.render();
     };
-    MathJax.typesetPromise = (elements: any = null) => {
+    MathJax.typesetPromise = (elements: any[] = null) => {
       document.options.elements = elements;
       document.reset();
       return mathjax.handleRetriesFor(() => {
         document.render();
       });
     };
-    MathJax.typesetClear = () => document.clear();
+    MathJax.typesetClear = (elements: any[] = null) => {
+      if (elements) {
+        document.reset();
+        document.clearMathItemsWithin(elements);
+      } else {
+        document.clear();
+      }
+    };
   }
 
   /**

ts/core/DOMAdaptor.ts

@@ -114,6 +114,15 @@ export interface DOMAdaptor<N, T, D> {
    */
   getElements(nodes: (string | N | N[])[], document: D): N[];
 
+  /**
+   * Determine if a container node contains a given node in somewhere in its DOM tree
+   *
+   * @param {N} container  The container to search
+   * @param {N|T} node     The node to look for
+   * @return {boolean}     True if the node is in the container's DOM tree
+   */
+  contains(container: N, node: N | T): boolean;
+
   /**
    * @param {N|T} node  The HTML node whose parent is to be obtained
    * @return {N}        The parent node of the given one
@@ -431,6 +440,11 @@ export abstract class AbstractDOMAdaptor<N, T, D> implements DOMAdaptor<N, T, D>
    */
   public abstract getElements(nodes: (string | N | N[])[], document: D): N[];
 
+  /**
+   * @override
+   */
+  public abstract contains(container: N, node: N | T): boolean;
+
   /**
    * @override
    */

ts/core/MathDocument.ts

@@ -230,6 +230,15 @@ export class RenderList<N, T, D> extends PrioritizedList<RenderData<N, T, D>> {
 
 }
 
+/*****************************************************************/
+/**
+ * The ways of specifying a container (a selector string, an actual node,
+ * or an array of those (e.g., the result of document.getElementsByTagName())
+ *
+ * @template N  The HTMLElement node class
+ */
+export type ContainerList<N> = string | N | (string | N | N[])[];
+
 /*****************************************************************/
 /**
  *  The MathDocument interface
@@ -428,6 +437,24 @@ export interface MathDocument<N, T, D> {
    */
   concat(list: MathList<N, T, D>): MathDocument<N, T, D>;
 
+  /**
+   * Clear the typeset MathItems that are within the given container
+   *   from the document's MathList.  (E.g., when the content of the
+   *   container has been updated and you want to remove the
+   *   associated MathItems)
+   *
+   * @param {ContainerList<N>} elements   The container DOM elements whose math items are to be removed
+   */
+  clearMathItemsWithin(containers: ContainerList<N>): void;
+
+  /**
+   * Get the typeset MathItems that are within a given container.
+   *
+   * @param {ContainerList<N>} elements   The container DOM elements whose math items are to be found
+   * @return {MathItem<N,T,D>[]}          The list of MathItems within that container
+   */
+  getMathItemsWithin(elements: ContainerList<N>): MathItem<N, T, D>[];
+
 }
 
 /*****************************************************************/
@@ -857,6 +884,34 @@ export abstract class AbstractMathDocument<N, T, D> implements MathDocument<N, T
     return this;
   }
 
+  /**
+   * @override
+   */
+  public clearMathItemsWithin(containers: ContainerList<N>) {
+    this.math.remove(...this.getMathItemsWithin(containers));
+  }
+
+  /**
+   * @override
+   */
+  public getMathItemsWithin(elements: ContainerList<N>) {
+    if (!Array.isArray(elements)) {
+      elements = [elements];
+    }
+    const adaptor = this.adaptor;
+    const items = [] as MathItem<N, T, D>[];
+    const containers = adaptor.getElements(elements, this.document);
+    ITEMS: for (const item of this.math) {
+      for (const container of containers) {
+        if (item.start.node && adaptor.contains(container, item.start.node)) {
+          items.push(item);
+          continue ITEMS;
+        }
+      }
+    }
+    return items;
+  }
+
 }
 
 /**

ts/util/LinkedList.ts

@@ -26,7 +26,7 @@
  *  A symbol used to mark the special node used to indicate
  *  the start and end of the list.
  */
-const END = Symbol();
+export const END = Symbol();
 
 /**
  * Shorthand type for the functions used to sort the data items
@@ -190,6 +190,28 @@ export class LinkedList<DataClass> {
     return item.data as DataClass;
   }
 
+  /**
+   * Remove items from the list
+   *
+   * @param {DataClass[]} items   The items to remove
+   */
+  public remove(...items: DataClass[]) {
+    const map = new Map<DataClass, boolean>();
+    for (const item of items) {
+      map.set(item, true);
+    }
+    let item = this.list.next;
+    while (item.data !== END) {
+      const next = item.next;
+      if (map.has(item.data as DataClass)) {
+        item.prev.next = item.next;
+        item.next.prev = item.prev;
+        item.next = item.prev = null;
+      }
+      item = next;
+    }
+  }
+
   /**
    * Empty the list
    *