Add support for pipes in templates #53

The goal is to be able to modify values of variables used in templates.
It enables future functionality such as escaping, inlining etc.

It adds support applying predefined pipes to variables. Pipes
can be applied to variable substitution in with and parameter
substitution expressions. They work in similar way to piping in Unix
where each pipe applied to the compiled result of pipe before.

It adds support for using pipes in `with` and parameter substitution
expressions. It also refactors how their regex is build to reuse more of
the logic by abstracting regex building into a new class.

Finally, it separates and extends documentation for templating.

src/application/Parser/Script/Compiler/Expressions/Pipes/PipeFactory.ts

@@ -0,0 +1,42 @@
+import { IPipe } from './IPipe';
+
+const RegisteredPipes = [ ];
+
+export interface IPipeFactory {
+    get(pipeName: string): IPipe;
+}
+
+export class PipeFactory implements IPipeFactory {
+    private readonly pipes = new Map<string, IPipe>();
+    constructor(pipes: readonly IPipe[] = RegisteredPipes) {
+        if (pipes.some((pipe) => !pipe)) {
+            throw new Error('undefined pipe in list');
+        }
+        for (const pipe of pipes) {
+            this.registerPipe(pipe);
+        }
+    }
+    public get(pipeName: string): IPipe {
+        validatePipeName(pipeName);
+        if (!this.pipes.has(pipeName)) {
+            throw new Error(`Unknown pipe: "${pipeName}"`);
+        }
+        return this.pipes.get(pipeName);
+    }
+    private registerPipe(pipe: IPipe): void {
+        validatePipeName(pipe.name);
+        if (this.pipes.has(pipe.name)) {
+            throw new Error(`Pipe name must be unique: "${pipe.name}"`);
+        }
+        this.pipes.set(pipe.name, pipe);
+    }
+}
+
+function validatePipeName(name: string) {
+    if (!name) {
+        throw new Error('empty pipe name');
+    }
+    if (!/^[a-z][A-Za-z]*$/.test(name)) {
+        throw new Error(`Pipe name should be camelCase: "${name}"`);
+    }
+}