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/***** BEGIN LICENSE BLOCK *****
* Version: CPL 1.0/GPL 2.0/LGPL 2.1
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* The contents of this file are subject to the Common Public
* License Version 1.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.eclipse.org/legal/cpl-v10.html
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* Copyright (C) 2010 Charles O Nutter
*
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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package org.jruby.ext.psych;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import org.jruby.Ruby;
import org.jruby.RubyArray;
import org.jruby.RubyClass;
import org.jruby.RubyFixnum;
import org.jruby.RubyModule;
import org.jruby.RubyObject;
import org.jruby.RubyString;
import org.jruby.anno.JRubyMethod;
import org.jruby.runtime.ObjectAllocator;
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.builtin.IRubyObject;
import org.jruby.util.IOOutputStream;
import org.jruby.util.TypeConverter;
import org.yaml.snakeyaml.DumperOptions;
import org.yaml.snakeyaml.emitter.Emitter;
import org.yaml.snakeyaml.emitter.EmitterException;
import org.yaml.snakeyaml.error.Mark;
import org.yaml.snakeyaml.events.AliasEvent;
import org.yaml.snakeyaml.events.DocumentEndEvent;
import org.yaml.snakeyaml.events.DocumentStartEvent;
import org.yaml.snakeyaml.events.Event;
import org.yaml.snakeyaml.events.ImplicitTuple;
import org.yaml.snakeyaml.events.MappingEndEvent;
import org.yaml.snakeyaml.events.MappingStartEvent;
import org.yaml.snakeyaml.events.ScalarEvent;
import org.yaml.snakeyaml.events.SequenceEndEvent;
import org.yaml.snakeyaml.events.SequenceStartEvent;
import org.yaml.snakeyaml.events.StreamEndEvent;
import org.yaml.snakeyaml.events.StreamStartEvent;
import static org.jruby.runtime.Visibility.*;
public class PsychEmitter extends RubyObject {
public static void initPsychEmitter(Ruby runtime, RubyModule psych) {
RubyClass psychEmitter = runtime.defineClassUnder("Emitter", runtime.getObject(), new ObjectAllocator() {
public IRubyObject allocate(Ruby runtime, RubyClass klazz) {
return new PsychEmitter(runtime, klazz);
}
}, psych);
psychEmitter.defineAnnotatedMethods(PsychEmitter.class);
}
public PsychEmitter(Ruby runtime, RubyClass klass) {
super(runtime, klass);
}
@JRubyMethod(visibility = PRIVATE)
public IRubyObject initialize(ThreadContext context, IRubyObject io) {
options = new DumperOptions();
options.setIndent(2);
emitter = new Emitter(new OutputStreamWriter(new IOOutputStream(io)), options);
return context.nil;
}
@JRubyMethod
public IRubyObject start_stream(ThreadContext context, IRubyObject encoding) {
if (!(encoding instanceof RubyFixnum)) {
throw context.runtime.newTypeError(encoding, context.runtime.getFixnum());
}
// TODO: do something with encoding? perhaps at the stream level?
StreamStartEvent event = new StreamStartEvent(NULL_MARK, NULL_MARK);
emit(context, event);
return this;
}
@JRubyMethod
public IRubyObject end_stream(ThreadContext context) {
StreamEndEvent event = new StreamEndEvent(NULL_MARK, NULL_MARK);
emit(context, event);
return this;
}
@JRubyMethod
public IRubyObject start_document(ThreadContext context, IRubyObject version, IRubyObject tags, IRubyObject implicit) {
Integer[] versionInts = null;
boolean implicitBool = implicit.isTrue();
Map tagsMap = Collections.EMPTY_MAP;
RubyArray versionAry = version.convertToArray();
if (versionAry.size() == 2) {
versionInts = new Integer[] {1, 1};
versionInts[0] = (int)versionAry.eltInternal(0).convertToInteger().getLongValue();
versionInts[1] = (int)versionAry.eltInternal(1).convertToInteger().getLongValue();
}
RubyArray tagsAry = tags.convertToArray();
if (tagsAry.size() > 0) {
tagsMap = new HashMap(tagsAry.size());
for (int i = 0; i < tagsAry.size(); i++) {
RubyArray tagsTuple = tagsAry.eltInternal(i).convertToArray();
if (tagsTuple.size() != 2) {
throw context.runtime.newRuntimeError("tags tuple must be of length 2");
}
IRubyObject key = tagsTuple.eltInternal(0);
IRubyObject value = tagsTuple.eltInternal(1);
tagsMap.put(
key.asJavaString(),
value.asJavaString());
}
}
DocumentStartEvent event = new DocumentStartEvent(NULL_MARK, NULL_MARK, implicitBool, versionInts, tagsMap);
emit(context, event);
return this;
}
@JRubyMethod
public IRubyObject end_document(ThreadContext context, IRubyObject implicit) {
DocumentEndEvent event = new DocumentEndEvent(NULL_MARK, NULL_MARK, implicit.isTrue());
emit(context, event);
return this;
}
@JRubyMethod(required = 6)
public IRubyObject scalar(ThreadContext context, IRubyObject[] args) {
IRubyObject value = args[0];
IRubyObject anchor = args[1];
IRubyObject tag = args[2];
IRubyObject plain = args[3];
IRubyObject quoted = args[4];
IRubyObject style = args[5];
if (!(value instanceof RubyString)) {
throw context.runtime.newTypeError(value, context.runtime.getString());
}
ScalarEvent event = new ScalarEvent(
anchor.isNil() ? null : anchor.asJavaString(),
tag.isNil() ? null : tag.asJavaString(),
new ImplicitTuple(plain.isTrue(),
quoted.isTrue()),
value.asJavaString(),
NULL_MARK,
NULL_MARK,
SCALAR_STYLES[(int)style.convertToInteger().getLongValue()]);
emit(context, event);
return this;
}
@JRubyMethod(required = 4)
public IRubyObject start_sequence(ThreadContext context, IRubyObject[] args) {
IRubyObject anchor = args[0];
IRubyObject tag = args[1];
IRubyObject implicit = args[2];
IRubyObject style = args[3];
final int SEQUENCE_BLOCK = 1; // see psych/nodes/sequence.rb
SequenceStartEvent event = new SequenceStartEvent(
anchor.isNil() ? null : anchor.asJavaString(),
tag.isNil() ? null : tag.asJavaString(),
implicit.isTrue(),
NULL_MARK,
NULL_MARK,
SEQUENCE_BLOCK != style.convertToInteger().getLongValue());
emit(context, event);
return this;
}
@JRubyMethod
public IRubyObject end_sequence(ThreadContext context) {
SequenceEndEvent event = new SequenceEndEvent(NULL_MARK, NULL_MARK);
emit(context, event);
return this;
}
@JRubyMethod(required = 4)
public IRubyObject start_mapping(ThreadContext context, IRubyObject[] args) {
IRubyObject anchor = args[0];
IRubyObject tag = args[1];
IRubyObject implicit = args[2];
IRubyObject style = args[3];
final int MAPPING_BLOCK = 1; // see psych/nodes/mapping.rb
MappingStartEvent event = new MappingStartEvent(
anchor.isNil() ? null : anchor.asJavaString(),
tag.isNil() ? null : tag.asJavaString(),
implicit.isTrue(),
NULL_MARK,
NULL_MARK,
MAPPING_BLOCK != style.convertToInteger().getLongValue());
emit(context, event);
return this;
}
@JRubyMethod
public IRubyObject end_mapping(ThreadContext context) {
MappingEndEvent event = new MappingEndEvent(NULL_MARK, NULL_MARK);
emit(context, event);
return this;
}
@JRubyMethod
public IRubyObject alias(ThreadContext context, IRubyObject anchor) {
AliasEvent event = new AliasEvent(anchor.asJavaString(), NULL_MARK, NULL_MARK);
emit(context, event);
return this;
}
@JRubyMethod(name = "canonical=")
public IRubyObject canonical_set(ThreadContext context, IRubyObject canonical) {
// TODO: unclear if this affects a running emitter
options.setCanonical(canonical.isTrue());
return canonical;
}
@JRubyMethod
public IRubyObject canonical(ThreadContext context) {
// TODO: unclear if this affects a running emitter
return context.runtime.newBoolean(options.isCanonical());
}
@JRubyMethod(name = "indentation=")
public IRubyObject indentation_set(ThreadContext context, IRubyObject level) {
// TODO: unclear if this affects a running emitter
options.setIndent((int)level.convertToInteger().getLongValue());
return level;
}
@JRubyMethod
public IRubyObject indentation(ThreadContext context) {
// TODO: unclear if this affects a running emitter
return context.runtime.newFixnum(options.getIndent());
}
private void emit(ThreadContext context, Event event) {
try {
emitter.emit(event);
} catch (IOException ioe) {
throw context.runtime.newIOErrorFromException(ioe);
} catch (EmitterException ee) {
throw context.runtime.newRuntimeError(ee.toString());
}
}
Emitter emitter;
DumperOptions options = new DumperOptions();
private static final Mark NULL_MARK = new Mark(null, 0, 0, 0, null, 0);
// Map style constants from Psych values (ANY = 0 ... FOLDED = 5)
// to SnakeYaml values; see psych/nodes/scalar.rb.
private static final Character[] SCALAR_STYLES = new Character[] {
null, // ANY; we'll choose plain
null, // PLAIN
'\'', // SINGLE_QUOTED
'"', // DOUBLE_QUOTED
'|', // LITERAL
'>', // FOLDED
};
}
