| package jp.ac.kobe_u.cs.prolog.builtin; |
| import jp.ac.kobe_u.cs.prolog.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 { |
| static SymbolTerm CHAR_CONVERSION = SymbolTerm.makeSymbol("char_conversion"); |
| static SymbolTerm DEBUG = SymbolTerm.makeSymbol("debug"); |
| static SymbolTerm UNKNOWN = SymbolTerm.makeSymbol("unknown"); |
| static SymbolTerm DOUBLE_QUOTES = SymbolTerm.makeSymbol("double_quotes"); |
| static SymbolTerm PRINT_STACK_TRACE = SymbolTerm.makeSymbol("print_stack_trace"); |
| |
| public Term arg1, arg2; |
| |
| public PRED_$set_prolog_impl_flag_2(Term a1, Term a2, Predicate cont) { |
| arg1 = a1; |
| arg2 = a2; |
| this.cont = cont; |
| } |
| |
| public PRED_$set_prolog_impl_flag_2(){} |
| |
| public void setArgument(Term[] args, Predicate cont) { |
| arg1 = args[0]; |
| arg2 = args[1]; |
| this.cont = cont; |
| } |
| |
| public int arity() { return 2; } |
| |
| public String toString() { |
| return "$set_prolog_impl_flag(" + arg1 + "," + arg2 + ")"; |
| } |
| |
| public Predicate 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 if (a1.equals(PRINT_STACK_TRACE)) { |
| if (! a2.isSymbol()) |
| return engine.fail(); |
| engine.setPrintStackTrace(((SymbolTerm)a2).name()); |
| } else { |
| return engine.fail(); |
| } |
| return cont; |
| } |
| } |