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Implement redirection for pluggable scripting contexts

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This commit is contained in:
James Roseborough
2013-02-03 00:22:47 +00:00
parent 05ac5f22e0
commit 8a93c061f7
5 changed files with 461 additions and 123 deletions
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43
examples/jse/ScriptEngineSample.java
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@@ -1,5 +1,9 @@
import java.io.CharArrayReader;
import java.io.CharArrayWriter;
import java.io.Reader;
import javax.script.Bindings;
import javax.script.Compilable;
import javax.script.CompiledScript;
@@ -11,6 +15,8 @@ import javax.script.SimpleBindings;
import org.luaj.vm2.LuaValue;
import org.luaj.vm2.lib.OneArgFunction;
import org.luaj.vm2.script.LuaScriptEngine;
import org.luaj.vm2.script.LuajBindings;
public class ScriptEngineSample {
@@ -22,6 +28,7 @@ public class ScriptEngineSample {
ScriptEngineManager sem = new ScriptEngineManager();
ScriptEngine e = sem.getEngineByExtension(".lua");
e = new LuaScriptEngine();
ScriptEngineFactory f = e.getFactory();
// uncomment to enable the lua-to-java bytecode compiler
@@ -66,8 +73,8 @@ public class ScriptEngineSample {
System.out.println( "y="+b1.get("y") );
System.out.println( "y="+b2.get("y") );
// Bindings that use a client-specified Bindings type.
Bindings sb = new SimpleBindings();
// In Luaj 3.0, client bindings must derive from LuajBindings.
Bindings sb = new LuajBindings();
sb.put("x", 2);
System.out.println( "eval: "+cs.eval(sb) );
@@ -81,6 +88,36 @@ public class ScriptEngineSample {
testEngineBindings(e);
testClientBindings(e);
testUserClasses(e);
// Test redirection of input, output, and standard error.
Reader input = new CharArrayReader("abcdefg\nhijk".toCharArray());
CharArrayWriter output = new CharArrayWriter();
CharArrayWriter errors = new CharArrayWriter();
String script =
"print(\"string written using 'print'\")\n" +
"io.write(\"string written using 'io.write()'\\n\")\n" +
"io.stdout:write(\"string written using 'io.stdout:write()'\\n\")\n" +
"io.stderr:write(\"string written using 'io.stderr:write()'\\n\")\n" +
"io.write([[string read using 'io.stdin:read(\"*l\")':]]..io.stdin:read(\"*l\")..\"\\n\")\n";
System.out.println("Evaluating script with redirection set.");
e.getContext().setReader(input);
e.getContext().setWriter(output);
e.getContext().setErrorWriter(errors);
e.eval(script);
System.out.println("output::>"+output+"<::output");
System.out.println("errors::>"+errors+"<::errors");
System.out.println("Evaluating script with redirection reset.");
output.reset();
errors.reset();
e.getContext().setReader(null);
e.getContext().setWriter(null);
e.getContext().setErrorWriter(null);
e.eval(script);
System.out.println("output::>"+output+"<::output");
System.out.println("errors::>"+errors+"<::errors");
} catch (ScriptException ex) {
ex.printStackTrace();
@@ -97,7 +134,7 @@ public class ScriptEngineSample {
testBindings(e, e.createBindings());
}
public static void testClientBindings(ScriptEngine e) throws ScriptException {
testBindings(e, new SimpleBindings());
testBindings(e, new LuajBindings());
}
public static void testBindings(ScriptEngine e, Bindings b) throws ScriptException {
CompiledScript cs = ((Compilable)e).compile(