allow functions to call other functions #53

src/application/Parser/Script/Compiler/Expressions/ExpressionsCompiler.ts

@@ -0,0 +1,34 @@
+import { IExpressionsCompiler, ParameterValueDictionary } from './IExpressionsCompiler';
+import { generateIlCode, IILCode } from './ILCode';
+
+export class ExpressionsCompiler implements IExpressionsCompiler {
+    public static readonly instance: IExpressionsCompiler = new ExpressionsCompiler();
+    protected constructor() { }
+    public compileExpressions(code: string, parameters?: ParameterValueDictionary): string {
+        let intermediateCode = generateIlCode(code);
+        intermediateCode = substituteParameters(intermediateCode, parameters);
+        return intermediateCode.compile();
+    }
+}
+
+function substituteParameters(intermediateCode: IILCode, parameters: ParameterValueDictionary): IILCode {
+    const parameterNames = intermediateCode.getUniqueParameterNames();
+    ensureValuesProvided(parameterNames, parameters);
+    for (const parameterName of parameterNames) {
+        const parameterValue = parameters[parameterName];
+        intermediateCode = intermediateCode.substituteParameter(parameterName, parameterValue);
+    }
+    return intermediateCode;
+}
+
+function ensureValuesProvided(names: string[], nameValues: ParameterValueDictionary) {
+    nameValues = nameValues || {};
+    const notProvidedNames = names.filter((name) => !Boolean(nameValues[name]));
+    if (notProvidedNames.length) {
+        throw new Error(`parameter value(s) not provided for: ${printList(notProvidedNames)}`);
+    }
+}
+
+function printList(list: readonly string[]): string {
+    return `"${list.join('", "')}"`;
+}