Mercurial Hosting > luan
view src/luan/modules/BasicLuan.java @ 1320:2c8d1d76a82a
PackageLuan.read() returns null for exceptions
author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Mon, 04 Feb 2019 20:18:51 -0700 |
parents | 11d3640e739d |
children | f41919741100 |
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package luan.modules; import java.io.InputStreamReader; import java.io.IOException; import java.lang.reflect.Method; import java.util.Iterator; import java.util.Map; import java.util.List; import java.util.ArrayList; import java.util.Arrays; import luan.Luan; import luan.LuanState; import luan.LuanTable; import luan.LuanFunction; import luan.LuanException; import luan.LuanMethod; import luan.modules.parsers.LuanToString; public final class BasicLuan { public static String type(Object obj) { return Luan.type(obj); } public static LuanFunction load(String text,String sourceName,LuanTable env) throws LuanException { Utils.checkNotNull(text); Utils.checkNotNull(sourceName,1); return Luan.load(text,sourceName,env); } public static LuanFunction load_file(LuanState luan,String fileName) throws LuanException { if( fileName == null ) { fileName = "stdin:"; } else if( fileName.indexOf(':') == -1 ) { fileName = "file:" + fileName; } String src = PackageLuan.read(luan,fileName); if( src == null ) return null; return load(src,fileName,null); } public static LuanFunction pairs(final LuanTable t) throws LuanException { Utils.checkNotNull(t); return t.pairs(); } public static LuanFunction ipairs(final LuanTable t) throws LuanException { Utils.checkNotNull(t); return new LuanFunction() { List<Object> list = t.asList(); int i = 0; final int size = list.size(); @Override public Object[] call(LuanState luan,Object[] args) { if( i >= size ) return LuanFunction.NOTHING; Object val = list.get(i++); return new Object[]{i,val}; } }; } public static Object get_metatable(LuanTable table) throws LuanException { Utils.checkNotNull(table); LuanTable metatable = table.getMetatable(); if( metatable == null ) return null; Object obj = metatable.rawGet("__metatable"); return obj!=null ? obj : metatable; } public static void set_metatable(LuanTable table,LuanTable metatable) throws LuanException { Utils.checkNotNull(table); if( table.getHandler("__metatable") != null ) throw new LuanException("cannot change a protected metatable"); table.setMetatable(metatable); } public static boolean raw_equal(Object v1,Object v2) { return v1 == v2 || v1 != null && v1.equals(v2); } public static Object raw_get(LuanTable table,Object index) { return table.rawGet(index); } public static void raw_set(LuanTable table,Object index,Object value) { table.rawPut(index,value); } public static int raw_len(Object v) throws LuanException { if( v instanceof String ) { String s = (String)v; return s.length(); } if( v instanceof LuanTable ) { LuanTable t = (LuanTable)v; return t.rawLength(); } throw new LuanException( "bad argument #1 to 'raw_len' (table or string expected)" ); } public static String to_string(LuanState luan,Object v) throws LuanException { return luan.toString(v); } public static LuanTable new_error(LuanState luan,Object msg) throws LuanException { String s = luan.toString(msg); LuanTable tbl = new LuanException(s).table(luan); tbl.rawPut( "message", msg ); return tbl; } public static int assert_integer(int v) { return v; } public static long assert_long(long v) { return v; } public static double assert_double(double v) { return v; } public static float assert_float(float v) { return v; } public static LuanFunction range(final double from,final double to,Double stepV) throws LuanException { final double step = stepV==null ? 1.0 : stepV; if( step == 0.0 ) throw new LuanException("bad argument #3 (step may not be zero)"); return new LuanFunction() { double v = from; @Override public Object call(LuanState luan,Object[] args) { if( step > 0.0 && v > to || step < 0.0 && v < to ) return LuanFunction.NOTHING; double rtn = v; v += step; return rtn; } }; } public static LuanFunction values(final Object... args) throws LuanException { return new LuanFunction() { int i = 0; @Override public Object call(LuanState luan,Object[] unused) { if( i >= args.length ) return LuanFunction.NOTHING; Object val = args[i++]; return new Object[]{i,val}; } }; } private LuanFunction fn(Object obj) { return obj instanceof LuanFunction ? (LuanFunction)obj : null; } public static Object try_(LuanState luan,LuanTable blocks,Object... args) throws LuanException { Utils.checkNotNull(blocks); Object obj = blocks.get(1); if( obj == null ) throw new LuanException("missing 'try' value"); if( !(obj instanceof LuanFunction) ) throw new LuanException("bad 'try' value (function expected, got "+Luan.type(obj)+")"); LuanFunction tryFn = (LuanFunction)obj; LuanFunction catchFn = null; obj = blocks.get("catch"); if( obj != null ) { if( !(obj instanceof LuanFunction) ) throw new LuanException("bad 'catch' value (function expected, got "+Luan.type(obj)+")"); catchFn = (LuanFunction)obj; } LuanFunction finallyFn = null; obj = blocks.get("finally"); if( obj != null ) { if( !(obj instanceof LuanFunction) ) throw new LuanException("bad 'finally' value (function expected, got "+Luan.type(obj)+")"); finallyFn = (LuanFunction)obj; } try { return tryFn.call(luan,args); } catch(LuanException e) { if( catchFn == null ) throw e; return catchFn.call(luan,new Object[]{e.table(luan)}); } finally { if( finallyFn != null ) finallyFn.call(luan); } } @LuanMethod public static Object[] pcall(LuanState luan,LuanFunction f,Object... args) { try { Object[] r = Luan.array(f.call(luan,args)); Object[] rtn = new Object[r.length+1]; rtn[0] = true; for( int i=0; i<r.length; i++ ) { rtn[i+1] = r[i]; } return rtn; } catch(LuanException e) { return new Object[]{false,e.table(luan)}; } } public static String number_type(Number v) throws LuanException { Utils.checkNotNull(v); return v.getClass().getSimpleName().toLowerCase(); } public static int hash_code(Object obj) throws LuanException { if( obj == null ) { return 0; } else if( obj instanceof byte[] ) { return Arrays.hashCode((byte[])obj); } else { return obj.hashCode(); } } public static String stringify(Object obj,String strict) throws LuanException { boolean b; if( strict==null ) { b = false; } else if( strict.equals("strict") ) { b = true; } else { throw new LuanException("strict must be nil or 'strict'"); } return LuanToString.toString(obj,b); } }