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Java implementation of the raml parser
/*
* Copyright 2016 (c) MuleSoft, Inc.
*
* Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
* either express or implied. See the License for the specific
* language governing permissions and limitations under the License.
*/
package org.raml.parser.visitor;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Stack;
import java.util.regex.Pattern;
import org.apache.commons.lang.StringUtils;
import org.raml.emitter.RamlEmitter;
import org.raml.parser.builder.NodeBuilder;
import org.raml.parser.builder.TupleBuilder;
import org.raml.parser.completion.DefaultSuggestion;
import org.raml.parser.completion.NodeContext;
import org.raml.parser.completion.Suggestion;
import org.raml.parser.loader.DefaultResourceLoader;
import org.yaml.snakeyaml.Yaml;
import org.yaml.snakeyaml.nodes.MappingNode;
import org.yaml.snakeyaml.nodes.Node;
import org.yaml.snakeyaml.nodes.NodeId;
import org.yaml.snakeyaml.nodes.NodeTuple;
import org.yaml.snakeyaml.nodes.ScalarNode;
import org.yaml.snakeyaml.nodes.SequenceNode;
import org.yaml.snakeyaml.nodes.Tag;
public class YamlDocumentSuggester implements NodeHandler
{
private YamlDocumentBuilder builder;
private int offset;
private Stack nodes;
public YamlDocumentSuggester(YamlDocumentBuilder builder)
{
this.builder = builder;
this.nodes = new Stack();
}
public List suggest(String topSection, String context)
{
return suggest(topSection, context, null);
}
public List suggest(String topSection, String context, String bottomSection)
{
final List result = new ArrayList();
int contextColumn = calculateContextColumn(context);
String suggestRaml = digestSuggestRaml(topSection, bottomSection, contextColumn);
this.offset = suggestRaml.length();
if (offset == 0)
{
result.add(new DefaultSuggestion(RamlEmitter.VERSION, 0));
return result;
}
Yaml yamlParser = new Yaml();
NodeVisitor nodeVisitor = new NodeVisitor(this, new DefaultResourceLoader());
MappingNode rootNode = null;
Node compose = yamlParser.compose(new StringReader(suggestRaml));
if (compose != null && compose.getNodeId() == NodeId.mapping)
{
rootNode = (MappingNode) compose;
}
nodeVisitor.visitDocument(rootNode);
NodeBuilder parentNodeBuilder = null;
NodeContext nodeContext = nodes.peek();
while (!nodes.isEmpty())
{
nodeContext = popNode();
parentNodeBuilder = (NodeBuilder) this.builder.getBuilderContext().pop();
if (nodeContext.getParentIndentation() < contextColumn)
{
break;
}
}
if (!isContextInValue(context))
{
addKeySuggestions(context, result, parentNodeBuilder, nodeContext);
}
else
{
//todo add value suggestions
}
Collections.sort(result);
return result;
}
private String digestSuggestRaml(String topSection, String bottomSection, int contextColumn)
{
if (bottomSection == null)
{
return trimTrailingComments(topSection);
}
String bottom = digestBottomSection(bottomSection, contextColumn);
return trimTrailingComments(topSection + "\n" + bottom);
}
private String trimTrailingComments(String raml)
{
String[] lines = raml.split("\n");
int index = lines.length - 1;
Pattern blankOrComment = Pattern.compile("\\s*(#.*)?");
while (index > 0 && blankOrComment.matcher(lines[index]).matches())
{
index--;
}
if (index > 0)
{
lines[index] = lines[index].replaceFirst(" #.*", "");
}
StringBuilder result = new StringBuilder();
for (int i = 0; i <= index; i++)
{
result.append(lines[i]).append("\n");
}
return result.toString().trim();
}
private String digestBottomSection(String bottomSection, int contextColumn)
{
Pattern sameContext;
Pattern parentContext = null;
if (contextColumn > 0)
{
sameContext = Pattern.compile("[ ]{" + contextColumn + ",}\\S+.*");
parentContext = Pattern.compile("[ ]{0," + (contextColumn - 1) + "}\\S+.*");
}
else if (contextColumn == 0)
{
sameContext = Pattern.compile("\\S+.*");
}
else
{
throw new IllegalArgumentException("invalid column context: " + contextColumn);
}
StringBuilder buffer = new StringBuilder(bottomSection.length());
for (String line : bottomSection.split("\n"))
{
if (sameContext.matcher(line).matches())
{
buffer.append(line).append("\n");
}
else if (parentContext != null && parentContext.matcher(line).matches())
{
break;
}
}
return buffer.toString();
}
private void addKeySuggestions(String context, List result, NodeBuilder parent, NodeContext nodeContext)
{
if (parent instanceof TupleBuilder)
{
List existingKeys = nodeContext.getKeys();
Collection> childrenTupleBuilders = ((TupleBuilder) parent).getChildrenTupleBuilders();
for (TupleBuilder childTupleBuilder : childrenTupleBuilders)
{
List suggestions = childTupleBuilder.getHandler().getSuggestions();
String contextTrimmed = context.trim();
for (Suggestion suggestion : suggestions)
{
if (suggestion.getLabel().startsWith(contextTrimmed) && !existingKeys.contains(suggestion.getLabel()))
{
suggestion.setIndentation(nodeContext.getSiblingsIndentation());
result.add(suggestion);
}
}
}
}
}
private boolean isContextInValue(String context)
{
return context.contains(":");
}
private int calculateContextColumn(String context)
{
int column = 0;
while (column < context.length() && StringUtils.isWhitespace(context.charAt(column) + ""))
{
column++;
}
return column;
}
private void pushNode(Node node, MappingNode mappingNode)
{
pushNode(node.getStartMark().getColumn(), mappingNode);
}
private void pushNode(int column, MappingNode mappingNode)
{
nodes.push(new NodeContext(column, mappingNode));
}
private NodeContext popNode()
{
return nodes.pop();
}
@Override
public boolean onMappingNodeStart(MappingNode mappingNode, TupleType tupleType)
{
return builder.onMappingNodeStart(mappingNode, tupleType);
}
@Override
public void onMappingNodeEnd(MappingNode mappingNode, TupleType tupleType)
{
builder.onMappingNodeEnd(mappingNode, tupleType);
}
@Override
@SuppressWarnings("unchecked")
public boolean onSequenceStart(SequenceNode node, TupleType tupleType)
{
pushNode(node, null);
return builder.onSequenceStart(node, tupleType);
}
@Override
public void onSequenceEnd(SequenceNode node, TupleType tupleType)
{
popNode();
builder.onSequenceEnd(node, tupleType);
}
@Override
@SuppressWarnings("unchecked")
public void onScalar(ScalarNode node, TupleType tupleType)
{
try
{
builder.onScalar(node, tupleType);
}
catch (Exception e)
{
//ignore
}
}
@Override
public boolean onDocumentStart(MappingNode node)
{
if (node == null)
{
pushNode(0, null);
}
else
{
pushNode(node, node);
}
return builder.onDocumentStart(node);
}
@Override
public void onDocumentEnd(MappingNode node)
{
}
@Override
public void onTupleEnd(NodeTuple nodeTuple)
{
Node valueNode = nodeTuple.getValueNode();
if (validateOffset(valueNode))
{
popNode();
builder.onTupleEnd(nodeTuple);
}
}
private boolean validateOffset(Node valueNode)
{
return valueNode != null && valueNode.getEndMark().getIndex() < offset;
}
@Override
public boolean onTupleStart(NodeTuple nodeTuple)
{
try
{
builder.onTupleStart(nodeTuple);
MappingNode mapping = nodeTuple.getValueNode().getNodeId() == NodeId.mapping ? (MappingNode) nodeTuple.getValueNode() : null;
pushNode(nodeTuple.getKeyNode(), mapping);
}
catch (Exception e)
{
return false;
}
return true;
}
@Override
public void onSequenceElementStart(Node sequenceNode)
{
builder.onSequenceElementStart(sequenceNode);
}
@Override
public void onSequenceElementEnd(Node sequenceNode)
{
builder.onSequenceElementEnd(sequenceNode);
}
@Override
public void onCustomTagStart(Tag tag, Node originalValueNode, Node node)
{
builder.onCustomTagStart(tag, originalValueNode, node);
}
@Override
public void onCustomTagEnd(Tag tag, Node originalValueNode, Node node)
{
builder.onCustomTagEnd(tag, originalValueNode, node);
}
@Override
public void onCustomTagError(Tag tag, Node node, String message)
{
//ignore
}
}
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