| package com.googlecode.prolog_cafe.builtin; |
| import com.googlecode.prolog_cafe.lang.*; |
| /** |
| <code>'$get_prolog_impl_flag'/2</code><br> |
| @author Mutsunori Banbara (banbara@kobe-u.ac.jp) |
| @author Naoyuki Tamura (tamura@kobe-u.ac.jp) |
| @version 1.0 |
| */ |
| class PRED_$get_prolog_impl_flag_2 extends Predicate.P2 { |
| private static final SymbolTerm TRUE = SymbolTerm.intern("true"); |
| private static final SymbolTerm FALSE = SymbolTerm.intern("false"); |
| private static final SymbolTerm BOUNDED = SymbolTerm.intern("bounded"); |
| private static final SymbolTerm MAX_INTEGER = SymbolTerm.intern("max_integer"); |
| private static final SymbolTerm MIN_INTEGER = SymbolTerm.intern("min_integer"); |
| private static final SymbolTerm INTEGER_ROUNDING_FUNCTION = SymbolTerm.intern("integer_rounding_function"); |
| private static final SymbolTerm CHAR_CONVERSION = SymbolTerm.intern("char_conversion"); |
| private static final SymbolTerm DEBUG = SymbolTerm.intern("debug"); |
| private static final SymbolTerm MAX_ARITY = SymbolTerm.intern("max_arity"); |
| private static final SymbolTerm UNKNOWN = SymbolTerm.intern("unknown"); |
| private static final SymbolTerm DOUBLE_QUOTES = SymbolTerm.intern("double_quotes"); |
| |
| public PRED_$get_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(BOUNDED)) { |
| if (engine.isBounded()) { |
| if (! a2.unify(TRUE, engine.trail)) |
| return engine.fail(); |
| } else { |
| if (! a2.unify(FALSE, engine.trail)) |
| return engine.fail(); |
| } |
| } else if (a1.equals(MAX_INTEGER)) { |
| if (! a2.unify(new IntegerTerm(engine.getMaxInteger()), engine.trail)) |
| return engine.fail(); |
| } else if (a1.equals(MIN_INTEGER)) { |
| if (! a2.unify(new IntegerTerm(engine.getMinInteger()), engine.trail)) |
| return engine.fail(); |
| } else if (a1.equals(INTEGER_ROUNDING_FUNCTION)) { |
| if (! a2.unify(SymbolTerm.intern(engine.getIntegerRoundingFunction()), engine.trail)) |
| return engine.fail(); |
| } else if (a1.equals(CHAR_CONVERSION)) { |
| if (! a2.unify(SymbolTerm.intern(engine.getCharConversion()), engine.trail)) |
| return engine.fail(); |
| } else if (a1.equals(DEBUG)) { |
| if (! a2.unify(SymbolTerm.intern(engine.getDebug()), engine.trail)) |
| return engine.fail(); |
| } else if (a1.equals(MAX_ARITY)) { |
| if (! a2.unify(new IntegerTerm(engine.getMaxArity()), engine.trail)) |
| return engine.fail(); |
| } else if (a1.equals(UNKNOWN)) { |
| if (! a2.unify(SymbolTerm.intern(engine.getUnknown()), engine.trail)) |
| return engine.fail(); |
| } else if (a1.equals(DOUBLE_QUOTES)) { |
| if (! a2.unify(SymbolTerm.intern(engine.getDoubleQuotes()), engine.trail)) |
| return engine.fail(); |
| } else { |
| return engine.fail(); |
| } |
| return cont; |
| } |
| } |