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Improve JSR-223 bindings implementation to allow use of external Bindings class such as SimpleBindings

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This commit is contained in:
James Roseborough
2010-12-01 05:25:03 +00:00
parent f49c568297
commit a559655d7c
2 changed files with 55 additions and 73 deletions
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1
README.html
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@@ -707,6 +707,7 @@ and LuaForge:
<tr valign="top"><td>&nbsp;&nbsp;<b>2.0.1</b></td><td><ul>
<li>Improve correctness of singleton construction related to static initialization
<li>Fix nan-related error in constant folding logic that was failing on some JVMs
<li>JSR-223 fixes: add META-INF/services entry in jse jar, improve bindings implementation
</ul></td></tr>
<tr valign="top"><td>&nbsp;&nbsp;<b>2.0.2</b></td><td><ul>
<li>Not yet released

123
src/jse/org/luaj/vm2/script/LuaScriptEngine.java
View File

@@ -25,10 +25,6 @@ import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.io.StringReader;
import java.util.Collection;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import javax.script.Bindings;
import javax.script.Compilable;
@@ -37,6 +33,7 @@ import javax.script.ScriptContext;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineFactory;
import javax.script.ScriptException;
import javax.script.SimpleBindings;
import javax.script.SimpleScriptContext;
import org.luaj.vm2.LoadState;
@@ -44,8 +41,11 @@ import org.luaj.vm2.Lua;
import org.luaj.vm2.LuaClosure;
import org.luaj.vm2.LuaError;
import org.luaj.vm2.LuaFunction;
import org.luaj.vm2.LuaTable;
import org.luaj.vm2.LuaValue;
import org.luaj.vm2.Prototype;
import org.luaj.vm2.lib.ThreeArgFunction;
import org.luaj.vm2.lib.TwoArgFunction;
import org.luaj.vm2.lib.jse.JsePlatform;
/**
@@ -121,12 +121,12 @@ public class LuaScriptEngine implements ScriptEngine, Compilable {
public void put(String key, Object value) {
Bindings b = getBindings(ScriptContext.ENGINE_SCOPE);
((LuaBindings)b).put(key, value);
b.put(key, value);
}
public Object get(String key) {
Bindings b = getBindings(ScriptContext.ENGINE_SCOPE);
return ((LuaBindings)b).get(key);
return b.get(key);
}
public Bindings getBindings(int scope) {
@@ -138,7 +138,7 @@ public class LuaScriptEngine implements ScriptEngine, Compilable {
}
public Bindings createBindings() {
return new LuaBindings( _G );
return new SimpleBindings();
}
public ScriptContext getContext() {
@@ -168,8 +168,8 @@ public class LuaScriptEngine implements ScriptEngine, Compilable {
return new CompiledScript() {
public Object eval(ScriptContext context) throws ScriptException {
Bindings b = context.getBindings(ScriptContext.ENGINE_SCOPE);
LuaBindings lb = (LuaBindings) b;
LuaClosure c = new LuaClosure( p, lb.env );
LuaValue env = newBindingsBackedEnv(b);
LuaClosure c = new LuaClosure( p, env );
return c.invoke(LuaValue.NONE);
}
public ScriptEngine getEngine() {
@@ -181,14 +181,14 @@ public class LuaScriptEngine implements ScriptEngine, Compilable {
return new CompiledScript() {
public Object eval(ScriptContext context) throws ScriptException {
Bindings b = context.getBindings(ScriptContext.ENGINE_SCOPE);
LuaBindings lb = (LuaBindings) b;
LuaValue env = newBindingsBackedEnv(b);
LuaFunction lf;
try {
lf = (LuaFunction) c.newInstance();
} catch (Exception e) {
throw new ScriptException("instantiation failed: "+e.toString());
}
lf.setfenv(lb.env);
lf.setfenv(env);
return lf.invoke(LuaValue.NONE);
}
public ScriptEngine getEngine() {
@@ -206,30 +206,59 @@ public class LuaScriptEngine implements ScriptEngine, Compilable {
}
}
// ------ lua bindings -----
private static final class LuaBindings implements Bindings {
private LuaValue env;
private LuaValue mt;
private LuaBindings( LuaValue _G ) {
mt = LuaValue.tableOf();
mt.set( LuaValue.INDEX, _G );
clear();
// ------ lua bindings ----- private static final class BindingsBackedEnv extends LuaTable {
public LuaTable newBindingsBackedEnv(Bindings b) {
LuaTable t = new LuaTable();
LuaTable mt = new LuaTable(0,2);
mt.set(LuaValue.INDEX, new BindindsIndexFunction(b));
mt.set(LuaValue.NEWINDEX, new BindingsNewindexFunction(b));
t.setmetatable(mt);
return t;
}
public void clear() {
env = LuaValue.tableOf();
env.setmetatable(mt);
private static final class BindingsNewindexFunction extends ThreeArgFunction {
private final Bindings b;
private BindingsNewindexFunction(Bindings b) {
this.b = b;
}
public LuaValue call(LuaValue tbl, LuaValue key, LuaValue val) {
String k = key.tojstring();
if ( val.isnil() )
b.remove(k);
else
b.put(k, toJava(val));
return NIL;
}
private Object toJava(LuaValue v) {
switch ( v.type() ) {
case LuaValue.TNIL: return null;
case LuaValue.TSTRING: return v.tojstring();
case LuaValue.TUSERDATA: return v.checkuserdata(Object.class);
case LuaValue.TNUMBER: return v.isinttype()? new Integer(v.toint()): new Double(v.todouble());
case LuaValue.TNUMBER: return v.isinttype()? (Object) new Integer(v.toint()): (Object) new Double(v.todouble());
default:
throw new java.lang.UnsupportedOperationException(
"LuaBindings cannot convert lua type '"+v.typename()+"' to Java");
}
}
}
private final class BindindsIndexFunction extends TwoArgFunction {
private final Bindings b;
private BindindsIndexFunction(Bindings b) {
this.b = b;
}
public LuaValue call(LuaValue tbl, LuaValue key) {
String k = key.tojstring();
if ( b.containsKey(k) )
return toLua(b.get(k));
return _G.get(key);
}
private LuaValue toLua(Object javaValue) {
if ( javaValue instanceof Number ) {
return LuaValue.valueOf(((Number)javaValue).doubleValue());
@@ -241,54 +270,6 @@ public class LuaScriptEngine implements ScriptEngine, Compilable {
return LuaValue.userdataOf(javaValue);
}
}
public boolean containsKey(Object key) {
return ! env.get(toLua(key)).isnil();
}
public Object get(Object key) {
return toJava(env.get(toLua(key)));
}
public Object put(String name, Object value) {
LuaValue key = toLua(name);
Object result = toJava(env.get(key));
env.set(key, toLua(value));
return result;
}
public void putAll(Map<? extends String, ? extends Object> toMerge) {
for ( Iterator it=toMerge.entrySet().iterator(); it.hasNext(); ) {
Map.Entry<String, Object> e = (Map.Entry<String, Object>) it.next();
put( e.getKey(), e.getValue() );
}
}
public Object remove(Object javakey) {
LuaValue key = toLua(javakey);
Object result = toJava(env.get(key));
env.set(key, LuaValue.NIL);
return result;
}
public boolean containsValue(Object value) {
throw new java.lang.UnsupportedOperationException(
"containsValue() not supported for LuaBindings");
}
public Set<java.util.Map.Entry<String, Object>> entrySet() {
throw new java.lang.UnsupportedOperationException(
"entrySet() not supported for LuaBindings");
}
public boolean isEmpty() {
throw new java.lang.UnsupportedOperationException(
"isEmpty() not supported for LuaBindings");
}
public Set<String> keySet() {
throw new java.lang.UnsupportedOperationException(
"keySet() not supported for LuaBindings");
}
public int size() {
throw new java.lang.UnsupportedOperationException(
"size() not supported for LuaBindings");
}
public Collection<Object> values() {
throw new java.lang.UnsupportedOperationException(
"values() not supported for LuaBindings");
}
}
// ------ convert char stream to byte stream for lua compiler -----