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/PipelineCompiler.ts

@@ -0,0 +1,31 @@
+import { IPipeFactory, PipeFactory } from './PipeFactory';
+import { IPipelineCompiler } from './IPipelineCompiler';
+
+export class PipelineCompiler implements IPipelineCompiler {
+    constructor(private readonly factory: IPipeFactory = new PipeFactory()) { }
+    public compile(value: string, pipeline: string): string {
+        ensureValidArguments(value, pipeline);
+        const pipeNames = extractPipeNames(pipeline);
+        const pipes = pipeNames.map((pipeName) => this.factory.get(pipeName));
+        for (const pipe of pipes) {
+            value = pipe.apply(value);
+        }
+        return value;
+    }
+}
+
+function extractPipeNames(pipeline: string): string[] {
+    return pipeline
+        .trim()
+        .split('|')
+        .slice(1)
+        .map((p) => p.trim());
+}
+
+function ensureValidArguments(value: string, pipeline: string) {
+    if (!value) { throw new Error('undefined value'); }
+    if (!pipeline) { throw new Error('undefined pipeline'); }
+    if (!pipeline.trimStart().startsWith('|')) {
+        throw new Error('pipeline does not start with pipe');
+    }
+}