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             BuildContextBase.ts
        
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             / src / main / ts / tsx / BuildContextBase.ts
          
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      import { isNull, mixin, argumentNotNull } from "@implab/core-amd/safe";

      import { isPlainObject, isNode, isBuildContext } from "./traits";

      export abstract class BuildContextBase {

          _attrs = {};

          _children = new Array();

          _created: boolean = false;

          visitNext(v: any) {

              if (isNull(v))

                  return;

              if (isPlainObject(v)) {

                  if (this._created)

                      this._setAttrs(v);

                  else

                      mixin(this._attrs, v);

              } else {

                  if (this._created)

                      this._addChild(v);

                  else

                      this._children.push(v);

              }

          }

          getChildDom(v: any) {

              const tv = typeof v;

              if (tv === "string" || tv === "number" || tv === "boolean" || v instanceof RegExp || v instanceof Date) {

                  return document.createTextNode(v.toString());

              } else if (isNode(v)) {

                  return v;

              } else if (isBuildContext(v)) {

                  return v.getDomElement();

              } else {

                  throw new Error("Invalid parameter");

              }

          }

          abstract _getDomElement(): HTMLElement;

          ensureCreated() {

              if (!this._created) {

                  this._create(this._attrs, this._children);

                  this._children = [];

                  this._attrs = {};

                  this._created = true;

              }

          }

          getDomElement() {

              this.ensureCreated();

              return this._getDomElement();

          }

          abstract _addChild(child: any): void;

          abstract _setAttrs(attrs: object): void;

          abstract _create(attrs: object, children: any[]): void;

      }

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				import { isNull, mixin, argumentNotNull } from "@implab/core-amd/safe";
				import { isPlainObject, isNode, isBuildContext } from "./traits";

				export abstract class BuildContextBase {
				_attrs = {};

				_children = new Array();

				_created: boolean = false;

				visitNext(v: any) {
				if (isNull(v))
				return;

				if (isPlainObject(v)) {

				if (this._created)
				this._setAttrs(v);
				else
				mixin(this._attrs, v);

				} else {
				if (this._created)
				this._addChild(v);
				else
				this._children.push(v);
				}
				}

				getChildDom(v: any) {
				const tv = typeof v;
				if (tv === "string" \|\| tv === "number" \|\| tv === "boolean" \|\| v instanceof RegExp \|\| v instanceof Date) {
				return document.createTextNode(v.toString());
				} else if (isNode(v)) {
				return v;
				} else if (isBuildContext(v)) {
				return v.getDomElement();
				} else {
				throw new Error("Invalid parameter");
				}
				}

				abstract _getDomElement(): HTMLElement;

				ensureCreated() {
				if (!this._created) {
				this._create(this._attrs, this._children);
				this._children = [];
				this._attrs = {};
				this._created = true;
				}
				}

				getDomElement() {
				this.ensureCreated();
				return this._getDomElement();
				}

				abstract _addChild(child: any): void;

				abstract _setAttrs(attrs: object): void;

				abstract _create(attrs: object, children: any[]): void;
				}