Java String Replace replaceUnsafeNamespaceDelimiters(String input)

Description

* Replaces non-alphanumeric namespace delimiters in input with an alphanumeric form that can be handled by Vampire and other provers.

License

Apache License

Parameter

Parameter	Description
input	The String representation of a SUO-KIF Formula or other expression

Return

String The input string with unsafe namespace delimiters replaced by a safe alphanumeric form

Declaration

public static String replaceUnsafeNamespaceDelimiters(String input)

Method Source Code

//package com.java2s;
//License from project: Apache License 

import java.util.Arrays;

import java.util.List;

public class Main {
    /** *************************************************************
     * A String token that separates a qualified KIF term name
     * from the namespace abbreviation prefix that qualifies it.
     *///from  w  w  w  .jav a  2 s.  c  o m
    private static String KIF_NAMESPACE_DELIMITER = ":";
    /** *************************************************************
     * A String token that separates a qualified term name from
     * the W3C namespace abbreviation prefix that qualifies it.
     */
    private static String W3C_NAMESPACE_DELIMITER = ":";
    /** ***************************************************************
     * A "safe" alphanumeric ASCII string that can be substituted for
     * the W3C or SUO-KIF string delimiting a namespace prefix from an
     * unqualified term name.  The safe delimiter is used to produce
     * input formulae or files that can be loaded by Vampire and other
     * provers unable to handle term names containing non-alphanumeric
     * characters.
     */
    private static String SAFE_NAMESPACE_DELIMITER = "0xx1";

    /** ***************************************************************
     * Replaces non-alphanumeric namespace delimiters in input with an
     * alphanumeric form that can be handled by Vampire and other
     * provers.
     *
     * @param input The String representation of a SUO-KIF Formula or
     * other expression
     *
     * @return String The input string with unsafe namespace
     * delimiters replaced by a safe alphanumeric form
     */
    public static String replaceUnsafeNamespaceDelimiters(String input) {

        String output = input;
        try {
            if (isNonEmptyString(output)) {
                String safe = ("$1" + getSafeNamespaceDelimiter() + "$2");
                List<String> unsafe = Arrays.asList(getKifNamespaceDelimiter(), getW3cNamespaceDelimiter());
                for (String delim : unsafe) {
                    output = output.replaceAll("(\\w)" + delim + "(\\w)", safe);
                }
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        return output;
    }

    /** ***************************************************************
     * @param obj Any object
     * @return true if obj is a non-empty String, else false.
     */
    public static boolean isNonEmptyString(Object obj) {

        return ((obj instanceof String) && !obj.equals(""));
    }

    /** ***************************************************************
     * Returns a "safe" alphanumeric ASCII string that can be
     * substituted for the W3C or SUO-KIF string delimiting a
     * namespace prefix from an unqualified term name.  The safe
     * delimiter is used to produce input formulae or files that can
     * be loaded by Vampire and other provers unable to handle term
     * names containing non-alphanumeric characters.
     */
    public static String getSafeNamespaceDelimiter() {
        return SAFE_NAMESPACE_DELIMITER;
    }

    /** *************************************************************
     * Returns the string used in SUO-KIF to separate a namespace
     * prefix from the term it qualifies.
     */
    public static String getKifNamespaceDelimiter() {
        return KIF_NAMESPACE_DELIMITER;
    }

    /** ***************************************************************
     * Returns the string preferred by W3C to separate a namespace
     * prefix from the term it qualifies.
     */
    public static String getW3cNamespaceDelimiter() {
        return W3C_NAMESPACE_DELIMITER;
    }
}