add xml:space="preserve" to text runs

In MS Word 2015 (and possibly others), leading and trailing spaces are
ignored in text runs. This means that calling TextRun with
leading/trailing space would result in a document that didn't include
those spaces. The fix here (per http://officeopenxml.com/WPtext.php)
is to include an extra attribute on the "w:t" element that forces word
to recognize those spaces.

ts/docx/run/run-components/text.ts

@@ -1,9 +1,13 @@
-import { XmlComponent } from "../../xml-components";
+import { XmlAttributeComponent, XmlComponent } from "../../xml-components";
+
+class TextAttributes extends XmlAttributeComponent<{space: "default" | "preserve"}> {
+    protected xmlKeys = {space: "xml:space"};
+}
 
 export class Text extends XmlComponent {
-
     constructor(text: string) {
         super("w:t");
+        this.root.push(new TextAttributes({space: "preserve"}));
         if (text) {
             this.root.push(text);
         }

ts/tests/docx/document/documentTest.ts

@@ -41,7 +41,7 @@ describe("Document", () => {
             expect(body[0]).to.have.property("w:p").which.includes({
                 "w:r": [
                     {"w:rPr": []},
-                    {"w:t": ["sample paragraph text"]},
+                    {"w:t": [{_attr: {"xml:space": "preserve"}}, "sample paragraph text"]},
                 ],
             });
         });

ts/tests/docx/paragraph/paragraphTests.ts

@@ -39,7 +39,7 @@ describe("Paragraph", () => {
             expect(tree).to.be.an("array").which.includes({
                 "w:r": [
                     {"w:rPr": []},
-                    {"w:t": ["this is a test run"]},
+                    {"w:t": [{_attr: {"xml:space": "preserve"}}, "this is a test run"]},
                 ],
             });
         });

ts/tests/docx/run/run-components/text.ts

@@ -0,0 +1,22 @@
+import { expect } from "chai";
+import { Text } from "../../../../docx/run/run-components/text";
+import { Formatter } from "../../../../export/formatter";
+
+describe("Text", () => {
+    describe("#constructor", () => {
+        it("creates an empty text run if no text is given", () => {
+            const t = new Text("");
+            const f = new Formatter().format(t);
+            expect(f).to.deep.equal({"w:t": [{_attr: {"xml:space": "preserve"}}]});
+        });
+
+        it("adds the passed in text to the component", () => {
+            const t = new Text(" this is\n text");
+            const f = new Formatter().format(t);
+            expect(f).to.deep.equal({"w:t": [
+                {_attr: {"xml:space": "preserve"}},
+                " this is\n text",
+            ]});
+        });
+    });
+});

ts/tests/docx/run/textRunTests.ts

@@ -1,6 +1,6 @@
-import { assert } from "chai";
+import { expect } from "chai";
 import { TextRun } from "../../../docx/run/text-run";
-import { Utility } from "../../utility";
+import { Formatter } from "../../../export/formatter";
 
 describe("TextRun", () => {
     let run: TextRun;
@@ -9,8 +9,11 @@ describe("TextRun", () => {
 
         it("should add text into run", () => {
             run = new TextRun("test");
-            const newJson = Utility.jsonify(run);
+            const f = new Formatter().format(run);
-            assert.equal(newJson.root[1].root, "test");
+            expect(f).to.deep.equal({"w:r": [
+                {"w:rPr": []},
+                {"w:t": [{_attr: {"xml:space": "preserve"}}, "test"]},
+            ]});
         });
     });
 });

ts/tests/docx/table/testTable.ts

@@ -36,7 +36,7 @@ describe("Table", () => {
                 {"w:tcPr": []},
                 {"w:p": [
                     {"w:pPr": []},
-                    {"w:r": [{"w:rPr": []}, {"w:t": [c]}]},
+                    {"w:r": [{"w:rPr": []}, {"w:t": [{_attr: {"xml:space": "preserve"}}, c]}]},
                 ]},
             ]});
             expect(tree).to.deep.equal({
@@ -65,7 +65,7 @@ describe("Table", () => {
                 {"w:tcPr": []},
                 {"w:p": [
                     {"w:pPr": []},
-                    {"w:r": [{"w:rPr": []}, {"w:t": [c]}]},
+                    {"w:r": [{"w:rPr": []}, {"w:t": [{_attr: {"xml:space": "preserve"}}, c]}]},
                 ]},
             ]});
             expect(tree).to.deep.equal({
@@ -153,7 +153,7 @@ describe("Table", () => {
                         {"w:tcPr": []},
                         {"w:p": [
                             {"w:pPr": []},
-                            {"w:r": [{"w:rPr": []}, {"w:t": ["Hello"]}]},
+                            {"w:r": [{"w:rPr": []}, {"w:t": [{_attr: {"xml:space": "preserve"}}, "Hello"]}]},
                         ]},
                     ],
                 });
@@ -175,7 +175,10 @@ describe("Table", () => {
                         {"w:tcPr": []},
                         {"w:p": [
                             {"w:pPr": []},
-                            {"w:r": [{"w:rPr": []}, {"w:t": ["Test paragraph"]}]},
+                            {"w:r": [
+                                {"w:rPr": []},
+                                {"w:t": [{_attr: {"xml:space": "preserve"}}, "Test paragraph"]},
+                            ]},
                         ]},
                     ],
                 });