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view core/src/luan/LuanBit.java @ 474:00646edc9d92
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author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Sun, 10 May 2015 16:09:45 -0600 |
parents | e12841f7edef |
children | 5d4a78c93383 |
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package luan; import java.util.List; public final class LuanBit { public final LuanState luan; public final LuanElement el; LuanBit(LuanState luan,LuanElement el) { this.luan = luan; this.el = el; } public LuanException exception(Object msg) { return new LuanException(this,msg); } public String stackTrace() { StringBuilder buf = new StringBuilder(); if( el != null ) buf.append( "\n\t" ).append( el.toString(null) ); for( int i = luan.stackTrace.size() - 1; i>=0; i-- ) { buf.append( "\n\t" ).append( luan.stackTrace.get(i) ); } return buf.toString(); } public void dumpStack() { System.err.println( stackTrace() ); } public Object call(LuanFunction fn,String fnName,Object[] args) throws LuanException { if( el == null ) return fn.call(luan,args); List<StackTraceElement> stackTrace = luan.stackTrace; stackTrace.add( new StackTraceElement(el,fnName) ); try { return fn.call(luan,args); } catch(StackOverflowError e) { throw exception("stack overflow"); } finally { stackTrace.remove(stackTrace.size()-1); } } public String checkString(Object obj) throws LuanException { if( obj instanceof String ) return (String)obj; if( el != null ) { throw exception( "attempt to use '"+el.text()+"' (a " + Luan.type(obj) + " value) as a string" ); } else { throw exception( "attempt to use a " + Luan.type(obj) + " as a string" ); } } public Number checkNumber(Object obj) throws LuanException { if( obj instanceof Number ) return (Number)obj; if( el != null ) { throw exception( "attempt to perform arithmetic on '"+el.text()+"' (a " + Luan.type(obj) + " value)" ); } else { throw exception( "attempt to perform arithmetic on a " + Luan.type(obj) + " value" ); } } public LuanFunction checkFunction(Object obj) throws LuanException { if( obj instanceof LuanFunction ) return (LuanFunction)obj; if( el != null ) { throw exception( "attempt to call '"+el.text()+"' (a " + Luan.type(obj) + " value)" ); } else { throw exception( "attempt to call a " + Luan.type(obj) + " value" ); } } public Boolean checkBoolean(Object obj) throws LuanException { if( obj instanceof Boolean ) return (Boolean)obj; if( el != null ) { throw exception( "attempt to use '"+el.text()+"' (a " + Luan.type(obj) + " value) as a boolean" ); } else { throw exception( "attempt to use a " + Luan.type(obj) + " as a boolean" ); } } public String toString(Object obj) throws LuanException { if( obj instanceof LuanTable ) { LuanTable tbl = (LuanTable)obj; return tbl.toString(luan); } if( obj == null ) return "nil"; if( obj instanceof Number ) return Luan.toString((Number)obj); if( obj instanceof LuanException ) { LuanException le = (LuanException)obj; return le.getFullMessage(); } if( obj instanceof byte[] ) return "binary: " + Integer.toHexString(obj.hashCode()); return obj.toString(); } public LuanFunction getHandlerFunction(String op,LuanTable t) throws LuanException { Object f = t.getHandler(op); if( f == null ) return null; return checkFunction(f); } public LuanFunction getBinHandler(String op,Object o1,Object o2) throws LuanException { if( o1 instanceof LuanTable ) { LuanFunction f1 = getHandlerFunction(op,(LuanTable)o1); if( f1 != null ) return f1; } return o2 instanceof LuanTable ? getHandlerFunction(op,(LuanTable)o2) : null; } public boolean isLessThan(Object o1,Object o2) throws LuanException { if( o1 instanceof Number && o2 instanceof Number ) { Number n1 = (Number)o1; Number n2 = (Number)o2; return n1.doubleValue() < n2.doubleValue(); } if( o1 instanceof String && o2 instanceof String ) { String s1 = (String)o1; String s2 = (String)o2; return s1.compareTo(s2) < 0; } LuanFunction fn = getBinHandler("__lt",o1,o2); if( fn != null ) return checkBoolean( Luan.first(call(fn,"__lt",new Object[]{o1,o2})) ); throw exception( "attempt to compare " + Luan.type(o1) + " with " + Luan.type(o2) ); } public Object arithmetic(String op,Object o1,Object o2) throws LuanException { LuanFunction fn = getBinHandler(op,o1,o2); if( fn != null ) return Luan.first(call(fn,op,new Object[]{o1,o2})); String type = !(o1 instanceof Number) ? Luan.type(o1) : Luan.type(o2); throw exception("attempt to perform arithmetic on a "+type+" value"); } }