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/*******************************************************************************
* Copyright (c) 2005-2009 itemis AG (http://www.itemis.eu) and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
*******************************************************************************/
package org.eclipse.internal.xtend.xtend.codeassist;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import java.util.Stack;
import java.util.StringTokenizer;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.eclipse.internal.xtend.expression.codeassist.LazyVar;
import org.eclipse.internal.xtend.xtend.XtendFile;
import org.eclipse.internal.xtend.xtend.ast.Around;
import org.eclipse.internal.xtend.xtend.ast.Extension;
import org.eclipse.internal.xtend.xtend.types.AdviceContextType;
import org.eclipse.xtend.expression.AnalysationIssue;
import org.eclipse.xtend.expression.ExecutionContext;
import org.eclipse.xtend.expression.ExpressionFacade;
import org.eclipse.xtend.expression.ResourceManager;
import org.eclipse.xtend.expression.Variable;
import org.eclipse.xtend.typesystem.ParameterizedType;
import org.eclipse.xtend.typesystem.Type;
public class FastAnalyzer {
private static final Pattern PARAM_PATTERN = Pattern
.compile("([\\[\\]:\\w]+)\\s+([\\w]+)");
private final static Pattern IMPORT_PATTERN = Pattern
.compile("import\\s+([\\w\\:]+)\\s*;");
private final static Pattern INCOMPLETE_IMPORT_PATTERN = Pattern
.compile("import\\s+[\\w\\:]*\\z");
private final static Pattern EXTENSION_PATTERN = Pattern
.compile("extension\\s+([\\w\\:]+)\\s*(reexport)?\\s*;");
private final static Pattern INCOMPLETE_EXTENSION_PATTERN = Pattern
.compile("extension\\s+[\\w\\:]*\\z");
private final static Pattern FUNCTION_PATTERN = Pattern
.compile("((\\w+)\\s+)?(create\\s+([\\w:]+)(\\s+(\\w+))?\\s+)?([\\w:]+)\\s*\\(\\s*([\\[\\]:\\w\\s\\,]+)?\\s*\\)\\s*:\\s*[^;]*\\z");
private final static Pattern AROUND_PATTERN = Pattern
.compile("around\\s+([\\w:*]+)\\s*\\(\\s*([\\[\\]:\\w\\s\\,]+)?[\\s,*]*\\)\\s*:\\s*[^;]*\\z");
private final static Pattern TYPEDECL_PATTERN = Pattern
.compile("(;|\\A)\\s*\\w+\\s*\\(([\\[\\]:\\w\\s,]*)\\z");
private final static Pattern TYPEDECL_PARAM_PATTERN = Pattern
.compile("(,|\\(|\\A)\\s*[\\[\\]:\\w]*\\z");
private FastAnalyzer() {
}
public static boolean isInsideTypeDeclaration(final String s) {
final Matcher m = TYPEDECL_PATTERN.matcher(s);
if (m.find())
return TYPEDECL_PARAM_PATTERN.matcher(m.group(2)).find();
return false;
}
public static boolean isInsideExtensionImport(final String s) {
final Matcher m = INCOMPLETE_EXTENSION_PATTERN.matcher(s);
return m.find();
}
public static boolean isInsideImport(final String s) {
final Matcher m = INCOMPLETE_IMPORT_PATTERN.matcher(s);
return m.find();
}
public static boolean isInsideExpression(final String s) {
final Matcher m1 = AROUND_PATTERN.matcher(s);
if (!m1.find()) {
final Matcher m = FUNCTION_PATTERN.matcher(s);
return m.find();
}
return true;
}
public final static List<String> findImports(final String template) {
final Matcher m = IMPORT_PATTERN.matcher(template);
final List<String> result = new ArrayList<String>();
while (m.find()) {
result.add(m.group(1));
}
return result;
}
public final static List<String> findExtensions(final String template) {
final Matcher m = EXTENSION_PATTERN.matcher(template);
final List<String> result = new ArrayList<String>();
while (m.find()) {
result.add(m.group(1));
}
return result;
}
public final static Stack<Set<LazyVar>> computeStack(String toAnalyze) {
Matcher m = AROUND_PATTERN.matcher(toAnalyze);
Pattern p = AROUND_PATTERN;
final Set<LazyVar> vars = new HashSet<LazyVar>();
if (!m.find()) {
m = FUNCTION_PATTERN.matcher(toAnalyze);
p = FUNCTION_PATTERN;
if (m.find()) {
final int start = m.start();
toAnalyze = toAnalyze.substring(start);
m = p.matcher(toAnalyze);
m.find();
if (m.group(4) != null) {
final LazyVar v = new LazyVar();
v.typeName = m.group(4);
v.name = m.group(6);
if (v.name == null)
v.name = "this";
vars.add(v);
}
fillParams(vars, m.group(8));
}
} else {
fillParams(vars, m.group(2));
final LazyVar v = new LazyVar();
v.typeName = AdviceContextType.TYPE_NAME;
v.name = Around.CONTEXT_PARAM_NAME;
vars.add(v);
}
final Stack<Set<LazyVar>> stack = new Stack<Set<LazyVar>>();
stack.push(vars);
return stack;
}
private static void fillParams(final Set<LazyVar> vars, final String params) {
Matcher m;
if (params != null && !"".equals(params.trim())) {
final StringTokenizer st = new StringTokenizer(params, ",");
while (st.hasMoreTokens()) {
final String param = st.nextToken();
m = PARAM_PATTERN.matcher(param);
if (m.find()) {
final LazyVar v = new LazyVar();
v.typeName = m.group(1);
v.name = m.group(2);
vars.add(v);
}
}
}
}
public final static Partition computePartition(final String str) {
if (isInsideImport(str))
return Partition.NAMESPACE_IMPORT;
if (isInsideExtensionImport(str))
return Partition.EXTENSION_IMPORT;
if (isInsideTypeDeclaration(str))
return Partition.TYPE_DECLARATION;
if (isInsideExpression(str))
return Partition.EXPRESSION;
return Partition.DEFAULT;
}
public final static ExecutionContext computeExecutionContext(
final String str, ExecutionContext ctx,
final List<Extension> extensions) {
final Partition p = computePartition(str);
if (p == Partition.EXPRESSION || p == Partition.TYPE_DECLARATION) {
final List<String> imports = findImports(str);
final List<String> extensionImports = findExtensions(str);
final XtendFile tpl = new XtendFile() {
private String fqn;
public String getFullyQualifiedName() {
return fqn;
}
public void setFullyQualifiedName(String fqn) {
this.fqn = fqn;
}
public String[] getImportedNamespaces() {
return imports.toArray(new String[imports.size()]);
}
public String[] getImportedExtensions() {
return extensionImports.toArray(new String[extensionImports
.size()]);
}
public List<Extension> getExtensions() {
return extensions;
}
public void analyze(ExecutionContext ctx,
Set<AnalysationIssue> issues) {
// TODO Auto-generated method stub
}
public List<Extension> getPublicExtensions(ResourceManager rm, ExecutionContext ctx) {
return extensions;
}
public List<Extension> getPublicExtensions(
ResourceManager resourceManager,ExecutionContext ctx,
Set<String> flowoverCache) {
return extensions;
}
public List<Around> getArounds() {
return Collections.emptyList();
}
};
ctx = ctx.cloneWithResource(tpl);
final Stack<Set<LazyVar>> s = computeStack(str);
for (final Iterator<Set<LazyVar>> iter = s.iterator(); iter
.hasNext();) {
final Set<LazyVar> vars = iter.next();
for (final Iterator<LazyVar> iterator = vars.iterator(); iterator
.hasNext();) {
final LazyVar v = iterator.next();
Type vType = null;
if (v.typeName != null) {
vType = ctx.getTypeForName(v.typeName);
} else {
vType = new ExpressionFacade(ctx).analyze(v.expression,
new HashSet<AnalysationIssue>());
if (v.forEach) {
if (vType instanceof ParameterizedType) {
vType = ((ParameterizedType) vType)
.getInnerType();
} else {
vType = null;
}
}
}
ctx = ctx.cloneWithVariable(new Variable(v.name, vType));
}
}
}
return ctx;
}
}
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