Helfer ForeignChar

Jan Burse, erstellt 06. Jan 2019
package jekpro.frequent.stream;
import jekpro.reference.arithmetic.SpecialEval;
import jekpro.reference.structure.SpecialUniv;
import jekpro.tools.term.SkelAtom;
import matula.util.regex.ScannerToken;
import java.io.IOException;
import java.io.Reader;
import java.io.Writer;
/**
* <p>The foreign predicates for the module char.</p>
* <p/>
* Warranty & Liability
* To the extent permitted by applicable law and unless explicitly
* otherwise agreed upon, XLOG Technologies GmbH makes no warranties
* regarding the provided information. XLOG Technologies GmbH assumes
* no liability that any problems might be solved with the information
* provided by XLOG Technologies GmbH.
* <p/>
* Rights & License
* All industrial property rights regarding the information - copyright
* and patent rights in particular - are the sole property of XLOG
* Technologies GmbH. If the company was not the originator of some
* excerpts, XLOG Technologies GmbH has at least obtained the right to
* reproduce, change and translate the information.
* <p/>
* Reproduction is restricted to the whole unaltered document. Reproduction
* of the information is only allowed for non-commercial uses. Selling,
* giving away or letting of the execution of the library is prohibited.
* The library can be distributed as part of your applications and libraries
* for execution provided this comment remains unchanged.
* <p/>
* Restrictions
* Only to be distributed with programs that add significant and primary
* functionality to the library. Not to be distributed with additional
* software intended to replace any components of the library.
* <p/>
* Trademarks
* Jekejeke is a registered trademark of XLOG Technologies GmbH.
*/
public final class ForeignChar {
/****************************************************************/
/* Char I/O */
/****************************************************************/
/**
* <p>Send an end of line sequence to a stream.</p>
*
* @param para The stream.
* @throws IOException IO error.
*/
public static void sysNl(Writer para) throws IOException {
para.write('\n');
para.flush();
}
/**
* <p>Write a character to a text stream.</p>
*
* @param para The stream.
* @param val The character.
* @throws ClassCastException Validation error.
* @throws IOException IO error.
*/
public static void sysPutChar(Writer para, String val)
throws ClassCastException, IOException {
SpecialUniv.castCharacter(val);
para.write(val);
}
/**
* <p>Write a code to a text stream.</p>
*
* @param para The stream.
* @param val The code.
* @throws ClassCastException Validation error.
* @throws IOException IO error.
*/
public static void sysPutCode(Writer para, Integer val)
throws ClassCastException, IOException {
int n = SpecialEval.castCodePoint(val);
para.write(SkelAtom.valueOf(n));
}
/**
* <p>Read a character from a text stream.</p>
*
* @param para The stream.
* @return The read character or end_of_file.
* @throws IOException IO error.
*/
public static String sysGetChar(Reader para)
throws IOException {
int ch = ScannerToken.sysGetCode(para);
String val;
if (ch == -1) {
val = "end_of_file";
} else {
val = SkelAtom.valueOf(ch);
}
return val;
}
/**
* <p>Peek a character from a text stream.</p>
*
* @param para The stream.
* @return The peeked character or end_of_file.
* @throws IOException IO error.
*/
public static String sysPeekChar(Reader para)
throws IOException {
int ch = ScannerToken.sysPeekCode(para);
String val;
if (ch == -1) {
val = "end_of_file";
} else {
val = SkelAtom.valueOf(ch);
}
return val;
}
}

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