refactor script compilation to make it easy to add new expressions #41 #53

src/application/Parser/ScriptingDefinition/CodeSubstituter.ts

@@ -0,0 +1,33 @@
+import { IExpressionsCompiler, ParameterValueDictionary } from '@/application/Parser/Script/Compiler/Expressions/IExpressionsCompiler';
+import { ParameterSubstitutionParser } from '@/application/Parser/Script/Compiler/Expressions/SyntaxParsers/ParameterSubstitutionParser';
+import { CompositeExpressionParser } from '@/application/Parser/Script/Compiler/Expressions/Parser/CompositeExpressionParser';
+import { ExpressionsCompiler } from '@/application/Parser/Script/Compiler/Expressions/ExpressionsCompiler';
+import { IProjectInformation } from '@/domain/IProjectInformation';
+import { ICodeSubstituter } from './ICodeSubstituter';
+
+export class CodeSubstituter implements ICodeSubstituter {
+    constructor(
+        private readonly compiler: IExpressionsCompiler = createSubstituteCompiler(),
+        private readonly date = new Date(),
+    ) {
+
+    }
+    public substitute(code: string, info: IProjectInformation): string {
+        if (!code) { throw new Error('undefined code'); }
+        if (!info) { throw new Error('undefined info'); }
+        const parameters: ParameterValueDictionary = {
+            homepage: info.homepage,
+            version: info.version,
+            date: this.date.toUTCString(),
+        };
+        const compiledCode = this.compiler.compileExpressions(code, parameters);
+        return compiledCode;
+    }
+}
+
+function createSubstituteCompiler(): IExpressionsCompiler {
+    const parsers = [ new ParameterSubstitutionParser() ];
+    const parser = new CompositeExpressionParser(parsers);
+    const expressionCompiler = new ExpressionsCompiler(parser);
+    return expressionCompiler;
+}