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User luajava coersion logic for JSR-223 binding value coercions from Java to lua

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This commit is contained in:
James Roseborough
2010-12-03 15:39:26 +00:00
parent 79debeb11e
commit 81ad4455dc
3 changed files with 63 additions and 24 deletions
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71
examples/jse/ScriptEngineSample.java
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@@ -9,6 +9,8 @@ import javax.script.ScriptEngineManager;
import javax.script.ScriptException;
import javax.script.SimpleBindings;
import org.luaj.vm2.LuaValue;
public class ScriptEngineSample {
public static void main(String [] args) {
@@ -43,28 +45,73 @@ public class ScriptEngineSample {
System.out.println( "eval: "+cs.eval(sb) );
System.out.println( "y="+sb.get("y") );
cs = ((Compilable)e).compile(
"print( 'luajava', luajava )\n" +
// "_G.lua2java = require( 'org.luaj.vm2.lib.jse.LuajavaLib' )\n" +
// "print( 'lua2java', lua2java )\n" +
// "print( 'lua2java.newInstance', lua2java.newInstance )\n" +
"test = luajava.newInstance(\"java.lang.String\", \"test\")\n" +
"return test:toString()");
b = e.createBindings();
System.out.println( "eval: "+cs.eval(b) );
Object t = b.get("test");
System.out.println( "t="+t );
try {
e.eval("\n\nbogus example\n\n");
} catch ( ScriptException se ) {
System.out.println("script threw ScriptException as expected, message is '"+se.getMessage()+"'");
}
testClientBindings(e);
testUserClasses(e);
} catch (ScriptException ex) {
ex.printStackTrace();
}
}
public static class SomeUserClass {
public String toString() {
return "user-class-instance-"+this.hashCode();
}
}
public static void testClientBindings(ScriptEngine e) throws ScriptException {
CompiledScript cs = ((Compilable)e).compile(
"print( 'somejavaint', type(somejavaint), somejavaint )\n" +
"print( 'somejavadouble', type(somejavadouble), somejavadouble )\n" +
"print( 'somejavastring', type(somejavastring), somejavastring )\n" +
"print( 'somejavaobject', type(somejavaobject), somejavaobject )\n" +
"print( 'somejavaarray', type(somejavaarray), somejavaarray, somejavaarray[1] )\n" +
"someluaint = 444\n" +
"someluadouble = 555.666\n" +
"someluastring = 'def'\n" +
"someluauserdata = somejavaobject\n" +
"someluatable = { 999, 111 }\n" +
"someluafunction = function(x) print( 'hello, world', x ) return 678 end\n" +
"" );
Bindings b = e.createBindings();
b.put("somejavaint", 111);
b.put("somejavadouble", 222.333);
b.put("somejavastring", "abc");
b.put("somejavaobject", new SomeUserClass());
b.put("somejavaarray", new int[] { 777, 888 } );
System.out.println( "eval: "+cs.eval(b) );
Object someluaint = b.get("someluaint");
Object someluadouble = b.get("someluaint");
Object someluastring = b.get("someluastring");
Object someluauserdata = b.get("someluauserdata");
Object someluatable = b.get("someluatable");
Object someluafunction = b.get("someluafunction");
System.out.println( "someluaint: "+someluaint.getClass()+" "+someluaint );
System.out.println( "someluadouble: "+someluadouble.getClass()+" "+someluadouble );
System.out.println( "someluastring: "+someluastring.getClass()+" "+someluastring );
System.out.println( "someluauserdata: "+someluauserdata.getClass()+" "+someluauserdata );
System.out.println( "someluatable: "+someluatable.getClass()+" "+someluatable );
System.out.println( "someluafunction: "+someluafunction.getClass()+" "+someluafunction );
System.out.println( "someluafunction(345): "+((LuaValue) someluafunction).call(LuaValue.valueOf(345)) );
}
public static void testUserClasses(ScriptEngine e) throws ScriptException {
CompiledScript cs = ((Compilable)e).compile(
"test = test or luajava.newInstance(\"java.lang.String\", \"test\")\n" +
"print( 'test', type(test), test, tostring(test) )\n" +
"return test:toString()");
Bindings b = e.createBindings();
Object resultstring = cs.eval(b);
b.put("test", new SomeUserClass());
Object resultuserclass = cs.eval(b);
System.out.println( "eval(string): "+resultstring.getClass()+" "+resultstring );
System.out.println( "eval(userclass): "+resultuserclass.getClass()+" "+resultuserclass );
}
}

15
src/jse/org/luaj/vm2/script/LuaScriptEngine.java
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@@ -46,6 +46,7 @@ import org.luaj.vm2.LuaTable;
import org.luaj.vm2.LuaValue;
import org.luaj.vm2.Prototype;
import org.luaj.vm2.Varargs;
import org.luaj.vm2.lib.jse.CoerceJavaToLua;
import org.luaj.vm2.lib.jse.JsePlatform;
/**
@@ -231,17 +232,9 @@ public class LuaScriptEngine implements ScriptEngine, Compilable {
}
}
private LuaValue toLua(Object javaValue) {
if ( javaValue instanceof Number ) {
return LuaValue.valueOf(((Number)javaValue).doubleValue());
} else if ( javaValue instanceof String ) {
return LuaValue.valueOf(javaValue.toString());
} else if ( javaValue == null ) {
return LuaValue.NIL;
} else if ( javaValue instanceof LuaValue ) {
return (LuaValue) javaValue;
} else {
return LuaValue.userdataOf(javaValue);
}
return javaValue == null? LuaValue.NIL:
javaValue instanceof LuaValue? (LuaValue) javaValue:
CoerceJavaToLua.coerce(javaValue);
}
public void copyGlobalsToBindings() {
LuaValue[] keys = t.keys();

1
test/junit/org/luaj/vm2/lib/jse/LuaJavaCoercionTest.java
View File

@@ -9,7 +9,6 @@ import org.luaj.vm2.LuaTable;
import org.luaj.vm2.LuaUserdata;
import org.luaj.vm2.LuaValue;
import org.luaj.vm2.Varargs;
import org.luaj.vm2.compiler.LuaC;
public class LuaJavaCoercionTest extends TestCase {