add #overrideLevel method to concrete numberings

ts/numbering/level.ts

@@ -214,3 +214,5 @@ export class Level extends LevelBase {
         super(level, 1, numberFormat, levelText, lvlJc);
     }
 }
+
+export class LevelForOverride extends LevelBase {}

ts/numbering/num.ts

@@ -1,4 +1,5 @@
 import { Attributes, XmlAttributeComponent, XmlComponent } from "../docx/xml-components";
+import { LevelForOverride } from "./level";
 
 class AbstractNumId extends XmlComponent {
 
@@ -29,4 +30,51 @@ export class Num extends XmlComponent {
         this.root.push(new AbstractNumId(abstractNumId));
         this.id = numId;
     }
+
+    public overrideLevel(num: number, start?: number): LevelOverride {
+        const olvl = new LevelOverride(num, start);
+        this.root.push(olvl);
+        return olvl;
+    }
+}
+
+class LevelOverrideAttributes extends XmlAttributeComponent<{ilvl: number}> {
+    protected xmlKeys = {ilvl: "w:ilvl"};
+}
+
+class LevelOverride extends XmlComponent {
+    private levelNum: number;
+    private lvl?: LevelForOverride;
+
+    constructor(levelNum: number, start?: number) {
+        super("w:lvlOverride");
+        this.root.push(new LevelOverrideAttributes({ilvl: levelNum}));
+        if (start !== undefined) {
+            this.root.push(new StartOverride(start));
+        }
+        this.levelNum = levelNum;
+    }
+
+    get level(): LevelForOverride {
+        let lvl: LevelForOverride;
+        if (!this.lvl) {
+            lvl = new LevelForOverride(this.levelNum);
+            this.root.push(lvl);
+            this.lvl = lvl;
+        } else {
+            lvl = this.lvl;
+        }
+        return lvl;
+    }
+}
+
+class StartOverrideAttributes extends XmlAttributeComponent<{val: number}> {
+    protected xmlKeys = {val: "w:val"};
+}
+
+class StartOverride extends XmlComponent {
+    constructor(start: number) {
+        super("w:startOverride");
+        this.root.push(new StartOverrideAttributes({val: start}));
+    }
 }

ts/tests/numberingTest.ts

@@ -2,6 +2,7 @@ import { expect } from "chai";
 import { Formatter } from "../export/formatter";
 import { Numbering } from "../numbering";
 import { AbstractNumbering } from "../numbering/abstract-numbering";
+import { LevelForOverride } from "../numbering/level";
 import { Num } from "../numbering/num";
 
 describe("Numbering", () => {
@@ -394,3 +395,50 @@ describe("AbstractNumbering", () => {
         });
     });
 });
+
+describe("concrete numbering", () => {
+    describe("#overrideLevel", () => {
+        let numbering;
+        let abstractNumbering;
+        let concreteNumbering;
+        beforeEach(() => {
+            numbering = new Numbering();
+            abstractNumbering = numbering.createAbstractNumbering();
+            concreteNumbering = numbering.createConcreteNumbering(abstractNumbering);
+
+        });
+
+        it("sets a new override level for the given level number", () => {
+            concreteNumbering.overrideLevel(3);
+            const tree = new Formatter().format(concreteNumbering);
+            expect(tree["w:num"]).to.include({"w:lvlOverride": [{_attr: {"w:ilvl": 3}}]});
+        });
+
+        it("sets the startOverride element if start is given", () => {
+            concreteNumbering.overrideLevel(1, 9);
+            const tree = new Formatter().format(concreteNumbering);
+            expect(tree["w:num"]).to.include({
+                "w:lvlOverride": [
+                    {_attr: {"w:ilvl": 1}},
+                    {"w:startOverride": [{_attr: {"w:val": 9}}]},
+                ],
+            });
+        });
+
+        it("sets the lvl element if overrideLevel.level is accessed", () => {
+            const ol = concreteNumbering.overrideLevel(1);
+            expect(ol.level).to.be.instanceof(LevelForOverride);
+            const tree = new Formatter().format(concreteNumbering);
+            expect(tree["w:num"]).to.include({
+                "w:lvlOverride": [
+                    {_attr: {"w:ilvl": 1}},
+                    {"w:lvl": [
+                        {_attr: {"w15:tentative": 1, "w:ilvl": 1}},
+                        {"w:pPr": []},
+                        {"w:rPr": []},
+                    ]},
+                ],
+            });
+        });
+    });
+});