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The fully integrated standalone wiki, and acceptance testing framework.

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package fitnesse.wikitext.parser;

import java.util.Optional;

public class Variable extends SymbolType implements Rule, Translation {
    public static final Variable symbolType = new Variable();

    public Variable() {
        super("Variable");
        wikiMatcher(new Matcher().string("${"));
        wikiRule(this);
        htmlTranslation(this);
    }

    @Override
    public Maybe parse(Symbol current, Parser parser) {
        Maybe name = parser.parseToAsString(SymbolType.CloseBrace);
        if (name.isNothing() || name.getValue().isEmpty()) return Symbol.nothing;
        String variableName = name.getValue();
        if (!ScanString.isVariableName(variableName)) return Symbol.nothing;

        current.add(variableName);

        Optional variableValue = parser.getVariableSource().findVariable(variableName);
        if (!variableValue.isPresent()) {
            current.add(new Symbol(SymbolType.Meta).add("undefined variable: " + variableName));
        }
        else {
            Symbol variableValueSymbol = parser.parseWithParent(variableValue.get(), null);
            current.add(variableValueSymbol);
        }

        return new Maybe<>(current);
    }

    @Override
    public String toTarget(Translator translator, Symbol symbol) {
        return translator.translate(symbol.childAt(1));
    }
}