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Extractor.cs
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235 lines (198 loc) · 8.24 KB
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using Extractor.Semantics;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Diagnostics;
namespace Extractor
{
public class Extractor
{
//private SemanticModel semanticModel;
public const string UpTreeChar = "^";
public const string DownTreeChar = "_";
public const string InternalDelimiter = "|";
public const string MethodNameConst = "METHOD_NAME";
// public const string UpTreeChar = InternalDelimiter;
// public const string DownTreeChar = InternalDelimiter;
public static SyntaxKind[] ParentTypeToAddChildId = new SyntaxKind[] { SyntaxKind.SimpleAssignmentExpression,
SyntaxKind.ElementAccessExpression, SyntaxKind.SimpleMemberAccessExpression, SyntaxKind.InvocationExpression, SyntaxKind.BracketedArgumentList, SyntaxKind.ArgumentList};
private ICollection<Variable> variables;
public int LengthLimit { get; set; }
public int WidthLimit { get; set; }
public string Code { get; set; }
public bool ShouldHash { get; set; }
public int MaxContexts { get; set; }
public Extractor(string code, Options opts)
{
LengthLimit = opts.MaxLength;
WidthLimit = opts.MaxWidth;
ShouldHash = !opts.NoHash;
MaxContexts = opts.MaxContexts;
Code = code;
}
StringBuilder builder = new StringBuilder();
private string PathNodesToString(PathFinder.Path path)
{
builder.Clear();
var nodeTypes = path.LeftSide;
if (nodeTypes.Count() > 0)
{
builder.Append(nodeTypes.First().Kind());
if (ParentTypeToAddChildId.Contains(nodeTypes.First().Parent.Kind()))
{
builder.Append(GetTruncatedChildId(nodeTypes.First()));
}
foreach (var n in nodeTypes.Skip(1))
{
builder.Append(UpTreeChar).Append(n.Kind());
if (ParentTypeToAddChildId.Contains(n.Parent.Kind()))
{
builder.Append(GetTruncatedChildId(n));
}
}
builder.Append(UpTreeChar);
}
builder.Append(path.Ancesstor.Kind());
nodeTypes = path.RightSide;
if (nodeTypes.Count() > 0)
{
builder.Append(DownTreeChar);
builder.Append(nodeTypes.First().Kind());
if (ParentTypeToAddChildId.Contains(nodeTypes.First().Parent.Kind()))
{
builder.Append(GetTruncatedChildId(nodeTypes.First()));
}
foreach (var n in nodeTypes.Skip(1))
{
builder.Append(DownTreeChar).Append(n.Kind());
if (ParentTypeToAddChildId.Contains(n.Parent.Kind()))
{
builder.Append(GetTruncatedChildId(n));
}
}
}
return builder.ToString();
}
private int GetTruncatedChildId(SyntaxNode n)
{
var parent = n.Parent;
int index = parent.ChildNodes().ToList().IndexOf(n);
if (index > 3)
{
index = 3;
}
return index;
}
private string PathToString(PathFinder.Path path)
{
SyntaxNode ancesstor = path.Ancesstor;
StringBuilder builder = new StringBuilder();
builder.Append(path.Left.Text).Append(UpTreeChar);
builder.Append(this.PathNodesToString(path));
builder.Append(DownTreeChar).Append(path.Right.Text);
return builder.ToString();
}
internal IEnumerable<PathFinder.Path> GetInternalPaths(Tree tree)
{
var finder = new PathFinder(tree, LengthLimit, WidthLimit);
var allPairs = Utilities.ReservoirSample(Utilities.WeakConcat(Utilities.Choose2(variables),
variables.Select((arg) => new Tuple<Variable, Variable>(arg, arg))), MaxContexts);
//iterate over variable-variable pairs
foreach (Tuple<Variable, Variable> varPair in allPairs)
{
bool pathToSelf = varPair.Item1 == varPair.Item2;
foreach (var rhs in varPair.Item2.Leaves)
foreach (var lhs in varPair.Item1.Leaves)
{
if (lhs == rhs)
continue;
PathFinder.Path path = finder.FindPath(lhs, rhs, limited: true);
if (path == null)
continue;
yield return path;
}
}
}
private string SplitNameUnlessEmpty(string original)
{
var subtokens = Utilities.SplitToSubtokens(original).Where(s => s.Length > 0);
String name = String.Join(InternalDelimiter, subtokens);
if (name.Length == 0)
{
name = Utilities.NormalizeName(original);
}
if (String.IsNullOrWhiteSpace(name))
{
name = "SPACE";
}
if (String.IsNullOrEmpty(name))
{
name = "BLANK";
}
if (original == Extractor.MethodNameConst)
{
name = original;
}
return name;
}
static readonly char[] removeFromComments = new char[] {' ', '/', '*', '{', '}'};
public List<String> Extract()
{
var tree = new Tree(CSharpSyntaxTree.ParseText(Code).GetRoot());
IEnumerable<MethodDeclarationSyntax> methods = tree.GetRoot().DescendantNodesAndSelf().OfType<MethodDeclarationSyntax>().ToList();
List<String> results = new List<string>();
foreach(var method in methods) {
String methodName = method.Identifier.ValueText;
Tree methodTree = new Tree(method);
var subtokensMethodName = Utilities.SplitToSubtokens(methodName);
var tokenToVar = new Dictionary<SyntaxToken, Variable>();
this.variables = Variable.CreateFromMethod(methodTree).ToArray();
foreach (var variable in variables)
{
foreach (SyntaxToken token in variable.Leaves)
{
tokenToVar[token] = variable;
}
}
List<String> contexts = new List<String>();
foreach (PathFinder.Path path in GetInternalPaths(methodTree))
{
String pathString = SplitNameUnlessEmpty(tokenToVar[path.Left].Name)
+ "," + MaybeHash(this.PathNodesToString(path))
+ "," + SplitNameUnlessEmpty(tokenToVar[path.Right].Name);
Debug.WriteLine(path.Left.FullSpan+" "+tokenToVar[path.Left].Name+ "," +this.PathNodesToString(path)+ "," + tokenToVar[path.Right].Name+" "+path.Right.FullSpan);
contexts.Add(pathString);
}
var commentNodes = tree.GetRoot().DescendantTrivia().Where(
node => node.IsKind(SyntaxKind.MultiLineCommentTrivia) || node.IsKind(SyntaxKind.SingleLineCommentTrivia) || node.IsKind(SyntaxKind.MultiLineDocumentationCommentTrivia));
foreach (SyntaxTrivia trivia in commentNodes)
{
string commentText = trivia.ToString().Trim(removeFromComments);
string normalizedTrivia = SplitNameUnlessEmpty(commentText);
var parts = normalizedTrivia.Split('|');
for (int i = 0; i < Math.Ceiling((double)parts.Length / (double)5); i++)
{
var batch = String.Join("|", parts.Skip(i * 5).Take(5));
contexts.Add(batch + "," + "COMMENT" + "," + batch);
}
}
results.Add(String.Join("|", subtokensMethodName) + " " + String.Join(" ", contexts));
}
return results;
}
private string MaybeHash(string v)
{
if (this.ShouldHash)
{
return v.GetHashCode().ToString();
} else
{
return v;
}
}
}
}