SQL with ? for parameters about sql2o HOT 4 OPEN

public class ParameterParser implements CharParser{

    private final Map<String, List<Integer>> parameterMap;
    int paramIdx = 1;

    public ParameterParser(Map<String, List<Integer>> parameterMap) {
        this.parameterMap = parameterMap;
    }

    @Override
    public boolean canParse(char c, String sql, int idx) {
        // Vertex changes to support ? in SQL in addition to named params
        if( c == '?' ) {
            return true;
        }
        return sql.length() > idx + 1 && c == ':' && Character.isJavaIdentifierStart( sql.charAt(idx + 1) ) && sql.charAt(idx-1) != ':';
    }

    @Override
    public int parse(char c, int idx, StringBuilder parsedSql, String sql, int length) {
        // Vertex changes to support ? in SQL in addition to named params
        if( c == '?' ) {
            String paramName = "p" + paramIdx;
            List<Integer> indices = parameterMap.computeIfAbsent( paramName, k -> new ArrayList<>() );
            indices.add(paramIdx++);
        }
        else {
            int startIdx = idx;
            idx += 1;
            while( idx + 1 < length && Character.isJavaIdentifierPart( sql.charAt( idx + 1 ) ) )
            {
                idx += 1;
            }
            String name = sql.substring(startIdx + 1, idx + 1);
            List<Integer> indices = parameterMap.computeIfAbsent( name, k -> new ArrayList<>() );
            indices.add(paramIdx++);
        }

        parsedSql.append("?");

        return idx;
    }
}