apex-mutation-testing/lib/service/mutantGenerator.js

Apex mutation testing plugin

import { BoundaryConditionMutator } from '../mutator/boundaryConditionMutator.js';
import { IncrementMutator } from '../mutator/incrementMutator.js';
import { MutationListener } from '../mutator/mutationListener.js';
import { ApexLexer, ApexParser, CaseInsensitiveInputStream, CommonTokenStream, ParseTreeWalker, } from 'apex-parser';
import { TokenStreamRewriter } from 'antlr4ts';
export class MutantGenerator {
    tokenStream;
    compute(classContent, coveredLines) {
        const lexer = new ApexLexer(new CaseInsensitiveInputStream('other', classContent));
        this.tokenStream = new CommonTokenStream(lexer);
        const parser = new ApexParser(this.tokenStream);
        const tree = parser.compilationUnit();
        const incrementListener = new IncrementMutator();
        const boundaryListener = new BoundaryConditionMutator();
        const listener = new MutationListener([incrementListener, boundaryListener], coveredLines);
        ParseTreeWalker.DEFAULT.walk(listener, tree);
        return listener.getMutations();
    }
    mutate(mutation) {
        // Create a new token stream rewriter
        const rewriter = new TokenStreamRewriter(this.tokenStream);
        // Apply the mutation by replacing the original token with the replacement text
        rewriter.replace(mutation.token.symbol.tokenIndex, mutation.token.symbol.tokenIndex, mutation.replacement);
        // Get the mutated code
        return rewriter.getText();
    }
}
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