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Isolate Bindings state from ScriptEngine state.

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This commit is contained in:
James Roseborough
2008-06-15 19:19:49 +00:00
parent 76ef91a779
commit db37158ab8
2 changed files with 116 additions and 60 deletions
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155
src/script/org/luaj/script/LuaScriptEngine.java
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@@ -63,9 +63,9 @@ import org.luaj.vm.Platform;
*
* @author jim_roseborough
*/
public class LuaScriptEngine extends LFunction implements ScriptEngine, Compilable {
public class LuaScriptEngine implements ScriptEngine, Compilable {
private static final String __ENGINE_VERSION__ = "V0.39";
private static final String __ENGINE_VERSION__ = Lua._VERSION;
private static final String __NAME__ = "Luaj";
private static final String __SHORT_NAME__ = "Luaj";
private static final String __LANGUAGE__ = "lua";
@@ -86,8 +86,13 @@ public class LuaScriptEngine extends LFunction implements ScriptEngine, Compilab
public LuaScriptEngine() {
// create lua state
luaState = Platform.getInstance().newLuaState();
// set up context
setContext(new SimpleScriptContext());
ScriptContext ctx = new SimpleScriptContext();
ctx.setBindings(createBindings(), ScriptContext.ENGINE_SCOPE);
setContext(ctx);
// set special values
put(LANGUAGE_VERSION, __LANGUAGE_VERSION__);
@@ -98,15 +103,6 @@ public class LuaScriptEngine extends LFunction implements ScriptEngine, Compilab
put(FILENAME, __FILENAME__);
put(NAME, __SHORT_NAME__);
put("THREADING", null);
// create lua state
luaState = Platform.getInstance().newLuaState();
// connect up to bindings
LTable metatable = new LTable();
metatable.put("__index", this);
metatable.put("__newindex", this);
luaState._G.luaSetMetatable(metatable);
}
@@ -141,48 +137,12 @@ public class LuaScriptEngine extends LFunction implements ScriptEngine, Compilab
public void put(String key, Object value) {
Bindings b = getBindings(ScriptContext.ENGINE_SCOPE);
if ( value == null )
b.remove(key);
else {
if ( value instanceof Number ) {
double d = ((Number)value).doubleValue();
int id = (int) d;
value = (d==id? LInteger.valueOf(id): new LDouble(d));
} else if ( value instanceof String ) {
value = LString.valueOf(value.toString());
} else {
value = new LUserData(value);
}
b.put(key,value);
}
((LuaBindings)b).put(key, value);
}
public Object get(String key) {
Bindings b = getBindings(ScriptContext.ENGINE_SCOPE);
Object o = b.get(key);
if ( o == null )
return null;
LValue v = (LValue)o;
switch ( v.luaGetType() ) {
case Lua.LUA_TSTRING: return v.toJavaString();
case Lua.LUA_TUSERDATA: return v.toJavaInstance();
case Lua.LUA_TNUMBER: return v.isInteger()? (Object) v.toJavaBoxedInteger(): (Object) v.toJavaBoxedDouble();
}
return o;
}
public LValue __index(LuaState vm, LValue table, LValue key) {
Bindings b = getBindings(ScriptContext.ENGINE_SCOPE);
String k = key.toJavaString();
Object v = b.get(k);
return (LValue) v;
}
public void __newindex(LuaState vm, LValue table, LValue key, LValue val) {
Bindings b = getBindings(ScriptContext.ENGINE_SCOPE);
String k = key.toJavaString();
Object v = (val.isNil()? null: val);
b.put(k,v);
return ((LuaBindings)b).get(key);
}
public Bindings getBindings(int scope) {
@@ -194,7 +154,7 @@ public class LuaScriptEngine extends LFunction implements ScriptEngine, Compilab
}
public Bindings createBindings() {
return new SimpleBindings();
return new LuaBindings( luaState );
}
public ScriptContext getContext() {
@@ -221,7 +181,9 @@ public class LuaScriptEngine extends LFunction implements ScriptEngine, Compilab
final LPrototype p = LoadState.undump(luaState, is, "script");
return new CompiledScript() {
public Object eval(ScriptContext context) throws ScriptException {
LClosure c = p.newClosure( luaState._G );
Bindings b = context.getBindings(ScriptContext.ENGINE_SCOPE);
LuaBindings lb = (LuaBindings) b;
LClosure c = p.newClosure( lb.env );
luaState.doCall( c, new LValue[0] );
return luaState.topointer(1);
}
@@ -239,6 +201,95 @@ public class LuaScriptEngine extends LFunction implements ScriptEngine, Compilab
}
}
// ------ lua bindings -----
private static final class LuaBindings extends LFunction implements Bindings {
private LTable env;
private LTable mt;
private LuaBindings( LuaState luaState ) {
mt = new LTable();
mt.put( LValue.TM_INDEX, luaState._G );
clear();
}
public void clear() {
env = new LTable();
env.luaSetMetatable(mt);
}
private Object toJava(LValue v) {
switch ( v.luaGetType() ) {
case Lua.LUA_TNIL: return null;
case Lua.LUA_TSTRING: return v.toJavaString();
case Lua.LUA_TUSERDATA: return v.toJavaInstance();
case Lua.LUA_TNUMBER: return v.isInteger()? (Object) v.toJavaBoxedInteger(): (Object) v.toJavaBoxedDouble();
default:
throw new java.lang.UnsupportedOperationException(
"LuaBindings cannot convert lua type '"+v.luaGetTypeName()+"' to Java");
}
}
private LValue toLua(Object javaValue) {
if ( javaValue instanceof Number ) {
double d = ((Number)javaValue).doubleValue();
int id = (int) d;
return (d==id? LInteger.valueOf(id): new LDouble(d));
} else if ( javaValue instanceof String ) {
return LString.valueOf(javaValue.toString());
} else if ( javaValue == null ) {
return LNil.NIL;
} else {
return new LUserData(javaValue);
}
}
public boolean containsKey(Object key) {
return env.containsKey(toLua(key));
}
public Object get(Object key) {
return toJava(env.get(toLua(key)));
}
public Object put(String name, Object value) {
LValue key = toLua(name);
Object result = toJava(env.get(key));
env.put(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) {
LValue key = toLua(javakey);
Object result = toJava(env.get(key));
env.put(key, LNil.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 -----
private final class Utf8Encoder extends InputStream {
private final Reader r;
private final int[] buf = new int[2];

21
src/script/org/luaj/script/ScriptEngineSample.java
View File

@@ -21,6 +21,9 @@
******************************************************************************/
package org.luaj.script;
import javax.script.Bindings;
import javax.script.Compilable;
import javax.script.CompiledScript;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineFactory;
import javax.script.ScriptEngineManager;
@@ -32,14 +35,10 @@ public class ScriptEngineSample {
ScriptEngineManager sem = new ScriptEngineManager();
ScriptEngine e = sem.getEngineByExtension(".lua");
ScriptEngineFactory f = e.getFactory();
String engineName = f.getEngineName();
String engineVersion = f.getEngineVersion();
String langName = f.getLanguageName();
String langVersion = f.getLanguageVersion();
System.out.println(engineName + " " +
engineVersion + " " +
langName + " " +
langVersion);
System.out.println( "Engine name: " +f.getEngineName() );
System.out.println( "Engine Version: " +f.getEngineVersion() );
System.out.println( "LanguageName: " +f.getLanguageName() );
System.out.println( "Language Version: " +f.getLanguageVersion() );
String statement = f.getOutputStatement("\"hello, world\"");
System.out.println(statement);
try {
@@ -53,6 +52,12 @@ public class ScriptEngineSample {
e.eval("y = math.sqrt(x)");
System.out.println( "y="+e.get("y") );
CompiledScript cs = ((Compilable)e).compile("y = math.sqrt(x); return y");
Bindings b = e.createBindings();
b.put("x", 3);
System.out.println( "eval: "+cs.eval(b) );
System.out.println( "y="+b.get("y") );
e.eval("\n\nbogus example\n\n");
} catch (ScriptException ex) {
ex.printStackTrace();