From 9907eee9bc468136f40aad92a6e283b93e18b0a6 Mon Sep 17 00:00:00 2001
From: Dan Revah <danrevah89@gmail.com>
Date: Thu, 29 Dec 2016 11:26:30 +0200
Subject: [PATCH] left pad and right pad string pipes (#12)

---
 README.md                         | 28 +++++++++++++++++++++++++++-
 src/app/pipes/string/lpad.spec.ts | 30 ++++++++++++++++++++++++++++++
 src/app/pipes/string/lpad.ts      | 16 ++++++++++++++++
 src/app/pipes/string/rpad.spec.ts | 30 ++++++++++++++++++++++++++++++
 src/app/pipes/string/rpad.ts      | 16 ++++++++++++++++
 5 files changed, 119 insertions(+), 1 deletion(-)
 create mode 100644 src/app/pipes/string/lpad.spec.ts
 create mode 100644 src/app/pipes/string/lpad.ts
 create mode 100644 src/app/pipes/string/rpad.spec.ts
 create mode 100644 src/app/pipes/string/rpad.ts

diff --git a/README.md b/README.md
index 3cf6ea4b..0558457e 100644
--- a/README.md
+++ b/README.md
@@ -25,6 +25,8 @@
     - [underscore](#underscore)
     - [test](#test)
     - [match](#match)
+    - [lpad](#lpad)
+    - [rpad](#rpad)
  - [Array](#Array)   
     - [diff](#diff)
     - [flatten](#flatten)
@@ -262,7 +264,7 @@ API: `string | latinise`
 
 ### lines
 
-Removes accents from Latin characters.
+Converts a string with new lines into an array of each line.
 
 API: `string | lines`
 
@@ -305,6 +307,30 @@ API: `string | match: {RegExp}: {Flags}`
 <p>{{'FOO' | match: '^foo': 'i' }}</p> <!-- Output: 'FOO' -->
 ```
 
+### lpad
+
+Left pad a string to a given length using a given pad character (default is a space)
+
+
+API: `string | lpad: length: [padCharacter:string|optional]`
+
+```html
+<p>{{'foo' | lpad: 5}}</p> <!-- Output: "  foo" -->
+<!-- Cast a number to string in order to left pad it with zeros -->
+<p>{{String(3) | lpad: 5: '0'}}</p> <!-- Output: "00003" -->
+```
+
+### rpad
+
+Right pad a string to a given length using a given pad character  (default is a space)
+
+
+API: `string | rpad: length: [padCharacter:string|optional]`
+
+```html
+<p>{{'Foo' | rpad: 5: '#'}}</p> <!-- Output: "Foo##" -->
+```
+
 ## Array
 
 ### diff
diff --git a/src/app/pipes/string/lpad.spec.ts b/src/app/pipes/string/lpad.spec.ts
new file mode 100644
index 00000000..50f3d0a9
--- /dev/null
+++ b/src/app/pipes/string/lpad.spec.ts
@@ -0,0 +1,30 @@
+import {LeftPadPipe} from "./lpad";
+
+describe('LeftPadPipe Tests', () => {
+  let pipe:LeftPadPipe;
+
+  beforeEach(() => {
+    pipe = new LeftPadPipe();
+  });
+
+  it('Should left pad with 2 blanks', () => {
+    let result = pipe.transform('foo', 5);
+    expect(result).toEqual('  foo');
+  });
+
+  it('Should left pad a number casted to string with 5 zeros', () => {
+    let result = pipe.transform(String(2), 6, '0');
+    expect(result).toEqual('000002');
+  });
+
+  it('Should not add padding', () => {
+    let result = pipe.transform('foo', 3);
+    expect(result).toEqual('foo');
+  });
+
+  it('Should not add padding', () => {
+    let result = pipe.transform('foofoo', 3);
+    expect(result).toEqual('foofoo');
+  });
+
+});
diff --git a/src/app/pipes/string/lpad.ts b/src/app/pipes/string/lpad.ts
new file mode 100644
index 00000000..67dc9922
--- /dev/null
+++ b/src/app/pipes/string/lpad.ts
@@ -0,0 +1,16 @@
+import { PipeTransform, Pipe } from '@angular/core';
+import GeneralHelper from '../helpers/helpers';
+
+@Pipe({ name: 'lpad' })
+export class LeftPadPipe implements PipeTransform {
+  
+  transform(str: string, length: number, padCharacter: string = ' '): string {
+    if (!GeneralHelper.isString(str) || str.length >= length) {
+      return str;
+    }
+    while (str.length < length) {
+      str = padCharacter + str;
+    }
+    return str;
+  }
+}
diff --git a/src/app/pipes/string/rpad.spec.ts b/src/app/pipes/string/rpad.spec.ts
new file mode 100644
index 00000000..499014ec
--- /dev/null
+++ b/src/app/pipes/string/rpad.spec.ts
@@ -0,0 +1,30 @@
+import {RightPadPipe} from "./rpad";
+
+describe('RightPadPipe Tests', () => {
+  let pipe: RightPadPipe;
+
+  beforeEach(() => {
+    pipe = new RightPadPipe();
+  });
+
+  it('Should right pad with 2 blanks', () => {
+    let result = pipe.transform('foo', 5);
+    expect(result).toEqual('foo  ');
+  });
+
+  it('Should right pad a number casted to string with 5 zeros', () => {
+    let result = pipe.transform(String(2), 6, '0');
+    expect(result).toEqual('200000');
+  });
+
+  it('Should not add padding if sting length is the same as length', () => {
+    let result = pipe.transform('foo', 3);
+    expect(result).toEqual('foo');
+  });
+
+  it('Should not add padding if sting length is greater than length', () => {
+    let result = pipe.transform('foofoo', 3);
+    expect(result).toEqual('foofoo');
+  });
+
+});
diff --git a/src/app/pipes/string/rpad.ts b/src/app/pipes/string/rpad.ts
new file mode 100644
index 00000000..ba7e308d
--- /dev/null
+++ b/src/app/pipes/string/rpad.ts
@@ -0,0 +1,16 @@
+import { PipeTransform, Pipe } from '@angular/core';
+import GeneralHelper from '../helpers/helpers';
+
+@Pipe({ name: 'rpad' })
+export class RightPadPipe implements PipeTransform {
+  
+  transform(str: string, length: number = 1, padCharacter: string = ' '): string {
+    if (!GeneralHelper.isString(str) || str.length >= length) {
+      return str;
+    }
+    while (str.length < length) {
+      str = str + padCharacter;
+    }
+    return str;
+  }
+}