compat/maven-embedder/src/main/java/org/apache/maven/cli/props/MavenPropertiesLoader.java [114:162]:
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    private static String nextLocation(StringTokenizer st) {
        boolean optional = false;
        String retVal = null;

        if (st.countTokens() > 0) {
            String tokenList = "?\",";
            StringBuilder tokBuf = new StringBuilder(10);
            String tok;
            boolean inQuote = false;
            boolean tokStarted = false;
            boolean exit = false;
            while ((st.hasMoreTokens()) && (!exit)) {
                tok = st.nextToken(tokenList);
                switch (tok) {
                    case "\"":
                        inQuote = !inQuote;
                        if (inQuote) {
                            tokenList = "\"";
                        } else {
                            tokenList = "\" ";
                        }
                        break;
                    case ",":
                        if (tokStarted) {
                            retVal = tokBuf.toString();
                            tokStarted = false;
                            tokBuf = new StringBuilder(10);
                            exit = true;
                        }
                        break;
                    case "?":
                        optional = true;
                        break;
                    default:
                        tokStarted = true;
                        tokBuf.append(tok.trim());
                        break;
                }
            }

            // Handle case where end of token stream and
            // still got data
            if ((!exit) && (tokStarted)) {
                retVal = tokBuf.toString();
            }
        }

        return optional ? "?" + retVal : retVal;
    }
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impl/maven-cli/src/main/java/org/apache/maven/cling/props/MavenPropertiesLoader.java [113:161]:
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    private static String nextLocation(StringTokenizer st) {
        boolean optional = false;
        String retVal = null;

        if (st.countTokens() > 0) {
            String tokenList = "?\",";
            StringBuilder tokBuf = new StringBuilder(10);
            String tok;
            boolean inQuote = false;
            boolean tokStarted = false;
            boolean exit = false;
            while ((st.hasMoreTokens()) && (!exit)) {
                tok = st.nextToken(tokenList);
                switch (tok) {
                    case "\"":
                        inQuote = !inQuote;
                        if (inQuote) {
                            tokenList = "\"";
                        } else {
                            tokenList = "\" ";
                        }
                        break;
                    case ",":
                        if (tokStarted) {
                            retVal = tokBuf.toString();
                            tokStarted = false;
                            tokBuf = new StringBuilder(10);
                            exit = true;
                        }
                        break;
                    case "?":
                        optional = true;
                        break;
                    default:
                        tokStarted = true;
                        tokBuf.append(tok.trim());
                        break;
                }
            }

            // Handle case where end of token stream and
            // still got data
            if ((!exit) && (tokStarted)) {
                retVal = tokBuf.toString();
            }
        }

        return optional ? "?" + retVal : retVal;
    }
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