allow functions to call other functions #53

src/application/Parser/Script/Compiler/FunctionCall/FunctionCallCompiler.ts

@@ -0,0 +1,88 @@
+import { FunctionCallData, FunctionCallParametersData, FunctionData, ScriptFunctionCallData } from 'js-yaml-loader!*';
+import { ICompiledCode } from './ICompiledCode';
+import { ISharedFunctionCollection } from '../Function/ISharedFunctionCollection';
+import { IFunctionCallCompiler } from './IFunctionCallCompiler';
+import { IExpressionsCompiler } from '../Expressions/IExpressionsCompiler';
+import { ExpressionsCompiler } from '../Expressions/ExpressionsCompiler';
+
+export class FunctionCallCompiler implements IFunctionCallCompiler {
+    public static readonly instance: IFunctionCallCompiler = new FunctionCallCompiler();
+    protected constructor(
+        private readonly expressionsCompiler: IExpressionsCompiler = ExpressionsCompiler.instance) { }
+    public compileCall(
+        call: ScriptFunctionCallData,
+        functions: ISharedFunctionCollection): ICompiledCode {
+        if (!functions) { throw new Error('undefined functions'); }
+        if (!call) { throw new Error('undefined call'); }
+        const compiledCodes = new Array<ICompiledCode>();
+        const calls = getCallSequence(call);
+        calls.forEach((currentCall, currentCallIndex) => {
+            ensureValidCall(currentCall);
+            const commonFunction = functions.getFunctionByName(currentCall.function);
+            ensureExpectedParameters(commonFunction, currentCall);
+            let functionCode = compileCode(commonFunction, currentCall.parameters, this.expressionsCompiler);
+            if (currentCallIndex !== calls.length - 1) {
+                functionCode = appendLine(functionCode);
+            }
+            compiledCodes.push(functionCode);
+        });
+        const compiledCode = merge(compiledCodes);
+        return compiledCode;
+    }
+}
+
+function ensureExpectedParameters(func: FunctionData, call: FunctionCallData) {
+    if (!func.parameters && !call.parameters) {
+        return;
+    }
+    const unexpectedParameters = Object.keys(call.parameters || {})
+        .filter((callParam) => !func.parameters.includes(callParam));
+    if (unexpectedParameters.length) {
+        throw new Error(
+            `function "${func.name}" has unexpected parameter(s) provided: "${unexpectedParameters.join('", "')}"`);
+    }
+}
+
+function merge(codes: readonly ICompiledCode[]): ICompiledCode {
+    return {
+        code: codes.map((code) => code.code).join(''),
+        revertCode: codes.map((code) => code.revertCode).join(''),
+    };
+}
+
+function compileCode(
+    func: FunctionData,
+    parameters: FunctionCallParametersData,
+    compiler: IExpressionsCompiler): ICompiledCode {
+    return {
+        code: compiler.compileExpressions(func.code, parameters),
+        revertCode: compiler.compileExpressions(func.revertCode, parameters),
+    };
+}
+
+function getCallSequence(call: ScriptFunctionCallData): FunctionCallData[] {
+    if (typeof call !== 'object') {
+        throw new Error('called function(s) must be an object');
+    }
+    if (call instanceof Array) {
+        return call as FunctionCallData[];
+    }
+    return [ call as FunctionCallData ];
+}
+
+function ensureValidCall(call: FunctionCallData) {
+    if (!call) {
+        throw new Error(`undefined function call`);
+    }
+    if (!call.function) {
+        throw new Error(`empty function name called`);
+    }
+}
+
+function appendLine(code: ICompiledCode): ICompiledCode {
+    const appendLineIfNotEmpty = (str: string) => str ? `${str}\n` : str;
+    return {
+        code: appendLineIfNotEmpty(code.code),
+        revertCode: appendLineIfNotEmpty(code.revertCode),
+    };
+}

src/application/Parser/Script/Compiler/FunctionCall/ICompiledCode.ts

@@ -0,0 +1,4 @@
+export interface ICompiledCode {
+    readonly code: string;
+    readonly revertCode?: string;
+}

src/application/Parser/Script/Compiler/FunctionCall/IFunctionCallCompiler.ts

@@ -0,0 +1,9 @@
+import { ScriptFunctionCallData } from 'js-yaml-loader!*';
+import { ICompiledCode } from './ICompiledCode';
+import { ISharedFunctionCollection } from '../Function/ISharedFunctionCollection';
+
+export interface IFunctionCallCompiler {
+    compileCall(
+        call: ScriptFunctionCallData,
+        functions: ISharedFunctionCollection): ICompiledCode;
+}