Helfer FriendlyPrinter

Jan Burse, erstellt 19. Apr 2019
package jekdev.reference.debug;
import jekdev.model.builtin.ClauseTrace;
import jekdev.model.builtin.DirectiveTrace;
import jekdev.model.builtin.GoalTrace;
import jekpro.model.pretty.PrologWriter;
import jekpro.model.rope.Directive;
import jekpro.model.rope.Intermediate;
import java.io.IOException;
import java.io.Writer;
/**
* <p>This class provides an intermediate code printer.</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.
*/
final class FriendlyPrinter {
int flags;
int count;
PrologWriter pw;
int level;
/**
* <p>Get the first literal of a directive.</p>
*
* @param dire The directive.
* @return The first literal.
*/
Intermediate nextDirective(Directive dire) {
if ((flags & SpecialFriendly.MASK_FRIEND_DEBUG) != 0 &&
dire instanceof DirectiveTrace)
return ((DirectiveTrace) dire).nexttrace;
if ((flags & SpecialFriendly.MASK_FRIEND_DEBUG) != 0 &&
dire instanceof ClauseTrace)
return ((ClauseTrace) dire).nexttrace;
return dire.next;
}
/**
* <p>Get the last literal of a directive.</p>
*
* @param dire The directive.
* @return The first literal.
*/
Intermediate lastDirective(Directive dire) {
if ((flags & SpecialFriendly.MASK_FRIEND_DEBUG) != 0 &&
dire instanceof DirectiveTrace)
return ((DirectiveTrace) dire).lasttrace;
if ((flags & SpecialFriendly.MASK_FRIEND_DEBUG) != 0 &&
dire instanceof ClauseTrace)
return ((ClauseTrace) dire).lasttrace;
return dire.last;
}
/**
* <p>Get the next literal of a goal.</p>
*
* @param goal The goal.
* @return The next literal.
*/
Intermediate nextGoal(Intermediate goal) {
if ((flags & SpecialFriendly.MASK_FRIEND_DEBUG) != 0 &&
goal instanceof GoalTrace)
return ((GoalTrace) goal).nexttrace;
return goal.next;
}
/**
* <p>Write a line number.</p>
*
* @throws IOException Shit happens.
*/
void friendlyCount()
throws IOException {
Writer wr = pw.getWriter();
String str = Integer.toString(count);
for (int i = str.length(); i < 3; i++)
wr.write(" ");
wr.write(str);
wr.write(" ");
for (int i = 0; i < level; i++)
wr.write(" ");
count++;
}
}

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