apex-mutation-testing/lib/mutator/incrementMutator.js

Apex mutation testing plugin

import { BaseListener } from './baseListener.js';
import { TerminalNode } from 'antlr4ts/tree/index.js';
export class IncrementMutator extends BaseListener {
    REPLACEMENT_MAP = {
        '++': '--',
        '--': '++',
    };
    // Target rule
    // expression :
    //  | expression ('++' | '--')
    //  | ('+' | '-' | '++' | '--') expression
    enterPostOpExpression(ctx) {
        this.processOperation(ctx);
    }
    enterPreOpExpression(ctx) {
        this.processOperation(ctx);
    }
    processOperation(ctx) {
        if (ctx.childCount === 2) {
            let symbol = null;
            if (ctx.getChild(0) instanceof TerminalNode) {
                symbol = ctx.getChild(0);
            }
            else if (ctx.getChild(1) instanceof TerminalNode) {
                symbol = ctx.getChild(1);
            }
            if (symbol !== null && symbol.text in this.REPLACEMENT_MAP) {
                this._mutations.push({
                    mutationName: this.constructor.name,
                    token: symbol,
                    replacement: this.REPLACEMENT_MAP[symbol.text],
                });
            }
        }
    }
}
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