allow functions to call other functions #53

src/application/Parser/Script/Compiler/Function/SharedFunctionCollection.ts

@@ -0,0 +1,23 @@
+import { ISharedFunction } from './ISharedFunction';
+import { ISharedFunctionCollection } from './ISharedFunctionCollection';
+
+export class SharedFunctionCollection implements ISharedFunctionCollection {
+    private readonly functionsByName = new Map<string, ISharedFunction>();
+
+    public addFunction(func: ISharedFunction): void {
+        if (!func) { throw new Error('undefined function'); }
+        if (this.functionsByName.has(func.name)) {
+            throw new Error(`function with name ${func.name} already exists`);
+        }
+        this.functionsByName.set(func.name, func);
+    }
+
+    public getFunctionByName(name: string): ISharedFunction {
+        if (!name) { throw Error('undefined function name'); }
+        const func = this.functionsByName.get(name);
+        if (!func) {
+            throw new Error(`called function is not defined "${name}"`);
+        }
+        return func;
+    }
+}