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refactor: Refactor AssignmentExpression class #290

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refactor: Refactor AssignmentExpression class #290

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56 changes: 28 additions & 28 deletions packages/interpreter/src/components/visitor/assignmentExpression.ts
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Original file line number Diff line number Diff line change
@@ -1,50 +1,50 @@
import Visitor from ".";
import { ASTNode } from "bhai-lang-parser";

import InvalidStateException from "../../exceptions/invalidStateException";
import NallaPointerException from "../../exceptions/nallaPointerException";
import RuntimeException from "../../exceptions/runtimeException";
import { getOperationValue } from "../../helpers";
import InterpreterModule from "../../module/interpreterModule";


export default class AssignmentExpression implements Visitor {
visitNode(node: ASTNode) {
if (!node.left)
this.validateNode(node);

const identifier = node.left.name;
const value = node.right
? InterpreterModule.getVisitor(node.right.type).visitNode(node.right)
: undefined;

this.handleAssignment(identifier, node.operator, value);

return InterpreterModule.getCurrentScope().get(identifier);
}

private validateNode(node: ASTNode) {
if (!node.left) {
throw new InvalidStateException(
`left node not present while executing: ${node.type}`
`Left node not present while executing: ${node.type}`
);
}
}

let identifier = node.left.name;
let value: unknown;
private handleAssignment(identifier: string, operator: string, value: unknown) {
const currentScope = InterpreterModule.getCurrentScope();
const currentValue = currentScope.get(identifier);

if (node.right) {
value = InterpreterModule.getVisitor(node.right.type).visitNode(
node.right
if (currentValue === null && operator !== "=") {
throw new NallaPointerException(
`Nalla operand ni jamta "${operator}" ke sath`
);
}

if (identifier && node.operator) {
const left = currentScope.get(identifier);

if (left === null && node.operator !== "=")
throw new NallaPointerException(
`Nalla operand ni jamta "${node.operator}" ke sath`
);

if ((left === true || left === false) && node.operator !== "=")
throw new RuntimeException(
`Boolean operand ni jamta "${node.operator}" ke sath`
);

const newValue = getOperationValue(
{ left: currentScope.get(identifier), right: value },
node.operator
if ((currentValue === true || currentValue === false) && operator !== "=") {
throw new RuntimeException(
`Boolean operand ni jamta "${operator}" ke sath`
);
currentScope.assign(identifier, newValue);

return currentScope.get(identifier);
}

const newValue = getOperationValue({ left: currentValue, right: value }, operator);
currentScope.assign(identifier, newValue);
}
}