| package com.googlecode.prolog_cafe.builtin; |
| import com.googlecode.prolog_cafe.lang.*; |
| /** |
| <code>'$set_prolog_impl_flag'/2</code><br> |
| @author Mutsunori Banbara (banbara@kobe-u.ac.jp) |
| @author Naoyuki Tamura (tamura@kobe-u.ac.jp) |
| @version 1.0 |
| */ |
| class PRED_$set_prolog_impl_flag_2 extends Predicate.P2 { |
| private static final SymbolTerm CHAR_CONVERSION = SymbolTerm.intern("char_conversion"); |
| private static final SymbolTerm DEBUG = SymbolTerm.intern("debug"); |
| private static final SymbolTerm UNKNOWN = SymbolTerm.intern("unknown"); |
| private static final SymbolTerm DOUBLE_QUOTES = SymbolTerm.intern("double_quotes"); |
| |
| public PRED_$set_prolog_impl_flag_2(Term a1, Term a2, Operation cont) { |
| arg1 = a1; |
| arg2 = a2; |
| this.cont = cont; |
| } |
| |
| public Operation exec(Prolog engine) { |
| engine.setB0(); |
| Term a1, a2; |
| a1 = arg1; |
| a2 = arg2; |
| a1 = a1.dereference(); |
| a2 = a2.dereference(); |
| |
| if (a1.equals(CHAR_CONVERSION)) { |
| if (! a2.isSymbol()) |
| return engine.fail(); |
| engine.setCharConversion(((SymbolTerm)a2).name()); |
| } else if (a1.equals(DEBUG)) { |
| if (! a2.isSymbol()) |
| return engine.fail(); |
| engine.setDebug(((SymbolTerm)a2).name()); |
| } else if (a1.equals(UNKNOWN)) { |
| if (! a2.isSymbol()) |
| return engine.fail(); |
| engine.setUnknown(((SymbolTerm)a2).name()); |
| } else if (a1.equals(DOUBLE_QUOTES)) { |
| if (! a2.isSymbol()) |
| return engine.fail(); |
| engine.setDoubleQuotes(((SymbolTerm)a2).name()); |
| } else { |
| return engine.fail(); |
| } |
| return cont; |
| } |
| } |