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Fix escape characters parsing (#264)
* Fix escape characters parsing * small code refactoring * fix2 * fix3 * TypeNotFound * A - B
1 parent 4a5ed3c commit 99aacdd

8 files changed

Lines changed: 155 additions & 25 deletions

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‎Directory.Build.props‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -4,7 +4,7 @@
44
</PropertyGroup>
55

66
<PropertyGroup>
7-
<VersionPrefix>1.0.12</VersionPrefix>
7+
<VersionPrefix>1.0.13</VersionPrefix>
88
</PropertyGroup>
99

1010
<Choose>

‎src-console/ConsoleAppEF2.1.1_InMemory/Program.cs‎

Lines changed: 33 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -10,6 +10,23 @@ namespace ConsoleAppEF2
1010
{
1111
static class Program
1212
{
13+
public class A
14+
{
15+
public string topProperty { get; set; }
16+
public B bProperty { get; set; }
17+
public C cProperty { get; set; }
18+
}
19+
20+
public class B
21+
{
22+
public string someString { get; set; }
23+
}
24+
25+
public class C
26+
{
27+
public string someOtherString { get; set; }
28+
}
29+
1330
public class NestedDto
1431
{
1532
public string Name { get; set; }
@@ -47,8 +64,17 @@ class TestCustomTypeProvider : DefaultDynamicLinqCustomTypeProvider, IDynamicLin
4764
}
4865
}
4966

67+
private static void StringEscapeTest()
68+
{
69+
var strings = new[] { "test\\x" }.AsQueryable();
70+
71+
int count = strings.Count("Contains('\\')");
72+
Console.WriteLine(count);
73+
}
74+
5075
static void Main(string[] args)
5176
{
77+
StringEscapeTest();
5278
//var q = new[] { new NestedDto(), new NestedDto { NestedDto2 = new NestedDto2 { NestedDto3 = new NestedDto3 { Id = 42 } } } }.AsQueryable();
5379

5480
//var np1 = q.Select("np(it.NestedDto2.NestedDto3.Id, 0)");
@@ -68,9 +94,16 @@ static void Main(string[] args)
6894
var config = new ParsingConfig
6995
{
7096
AllowNewToEvaluateAnyType = true,
97+
ResolveTypesBySimpleName = true,
7198
CustomTypeProvider = new TestCustomTypeProvider()
7299
};
73100

101+
IQueryable<A> query = new[] { new A { bProperty = new B { someString = "x" } } }.AsQueryable();
102+
103+
string predicate = $"new {typeof(A).FullName}(new {typeof(B).FullName}(\"x\" as someString) as bProperty)";
104+
var result2 = query.Select(config, predicate);
105+
Console.WriteLine(predicate + ":" + JsonConvert.SerializeObject(result2));
106+
74107
//// Act
75108
//var testDataAsQueryable = new List<string> { "name1", "name2" }.AsQueryable();
76109
//var projectedData = (IQueryable<NestedDto>)testDataAsQueryable.Select(config, $"new {typeof(NestedDto).FullName}(~ as Name)");

‎src/System.Linq.Dynamic.Core/Parser/ExpressionParser.cs‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1523,7 +1523,7 @@ static Expression GenerateConversion(Expression expr, Type type, int errorPos)
15231523
return Expression.Convert(expr, type);
15241524
}
15251525

1526-
// Try to Parse the string rather that just generate the convert statement
1526+
// Try to Parse the string rather than just generate the convert statement
15271527
if (expr.NodeType == ExpressionType.Constant && exprType == typeof(string))
15281528
{
15291529
string text = (string)((ConstantExpression)expr).Value;

‎src/System.Linq.Dynamic.Core/Parser/TypeHelper.cs‎

Lines changed: 4 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -321,12 +321,13 @@ public static string GetTypeName(Type type)
321321
{
322322
Type baseType = GetNonNullableType(type);
323323

324-
string s = baseType.Name;
324+
string name = baseType.Name;
325325
if (type != baseType)
326326
{
327-
s += '?';
327+
name += '?';
328328
}
329-
return s;
329+
330+
return name;
330331
}
331332

332333
public static Type GetNonNullableType(Type type)

‎src/System.Linq.Dynamic.Core/Res.cs‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -61,7 +61,7 @@ internal static class Res
6161
public const string SyntaxError = "Syntax error";
6262
public const string TokenExpected = "{0} expected";
6363
public const string TypeHasNoNullableForm = "Type '{0}' has no nullable form";
64-
public const string TypeNotFound = "Type '{0}' not Found";
64+
public const string TypeNotFound = "Type '{0}' not found";
6565
public const string UnknownIdentifier = "Unknown identifier '{0}'";
6666
public const string UnknownPropertyOrField = "No property or field '{0}' exists in type '{1}'";
6767
public const string UnterminatedStringLiteral = "Unterminated string literal";

‎src/System.Linq.Dynamic.Core/Tokenizer/TextParser.cs‎

Lines changed: 43 additions & 17 deletions
Original file line numberDiff line numberDiff line change
@@ -8,6 +8,8 @@ internal class TextParser
88
{
99
private static char NumberDecimalSeparator = '.';
1010

11+
private static char[] EscapeCharacters = new[] { '\\', 'a', 'b', 'f', 'n', 'r', 't', 'v' };
12+
1113
// These aliases are supposed to simply the where clause and make it more human readable
1214
// As an addition it is compatible with the OData.Filter specification
1315
private static readonly Dictionary<string, TokenId> _predefinedAliases = new Dictionary<string, TokenId>
@@ -48,9 +50,21 @@ private void SetTextPos(int pos)
4850

4951
private void NextChar()
5052
{
51-
if (_textPos < _textLen) _textPos++;
53+
if (_textPos < _textLen)
54+
{
55+
_textPos++;
56+
}
5257
_ch = _textPos < _textLen ? _text[_textPos] : '\0';
5358
}
59+
public char PeekNextChar()
60+
{
61+
if (_textPos + 1 < _textLen)
62+
{
63+
return _text[_textPos + 1];
64+
}
65+
66+
return '\0';
67+
}
5468

5569
public void NextToken()
5670
{
@@ -252,29 +266,42 @@ public void NextToken()
252266

253267
case '"':
254268
case '\'':
269+
bool balanced = false;
255270
char quote = _ch;
256-
do
271+
272+
NextChar();
273+
274+
while (_textPos < _textLen && _ch != quote)
257275
{
258-
bool escaped;
276+
char next = PeekNextChar();
259277

260-
do
278+
if (_ch == '\\')
261279
{
262-
escaped = false;
263-
NextChar();
280+
if (EscapeCharacters.Contains(next))
281+
{
282+
NextChar();
283+
}
264284

265-
if (_ch == '\\')
285+
if (next == '"')
266286
{
267-
escaped = true;
268-
if (_textPos < _textLen) NextChar();
287+
NextChar();
269288
}
270289
}
271-
while (_textPos < _textLen && (_ch != quote || escaped));
272-
273-
if (_textPos == _textLen)
274-
throw ParseError(_textPos, Res.UnterminatedStringLiteral);
275290

276291
NextChar();
277-
} while (_ch == quote);
292+
293+
if (_ch == quote)
294+
{
295+
balanced = !balanced;
296+
}
297+
}
298+
299+
if (_textPos == _textLen && !balanced)
300+
{
301+
throw ParseError(_textPos, Res.UnterminatedStringLiteral);
302+
}
303+
304+
NextChar();
278305

279306
tokenId = TokenId.StringLiteral;
280307
break;
@@ -422,10 +449,9 @@ private static Exception ParseError(int pos, string format, params object[] args
422449
return new ParseException(string.Format(CultureInfo.CurrentCulture, format, args), pos);
423450
}
424451

425-
private static TokenId GetAliasedTokenId(TokenId t, string alias)
452+
private static TokenId GetAliasedTokenId(TokenId tokenId, string alias)
426453
{
427-
TokenId id;
428-
return t == TokenId.Identifier && _predefinedAliases.TryGetValue(alias, out id) ? id : t;
454+
return tokenId == TokenId.Identifier && _predefinedAliases.TryGetValue(alias, out TokenId id) ? id : tokenId;
429455
}
430456

431457
private static bool IsHexChar(char c)

‎test/System.Linq.Dynamic.Core.Tests/DynamicExpressionParserTests.cs‎

Lines changed: 35 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -528,6 +528,40 @@ public void DynamicExpressionParser_ParseLambda_StringLiteralEscapedBackslash_Re
528528
Assert.Equal(expectedRightValue, rightValue);
529529
}
530530

531+
[Fact]
532+
public void DynamicExpressionParser_ParseLambda_StringLiteral_Backslash()
533+
{
534+
string expectedLeftValue = "Property1.IndexOf(\"\\\\\")";
535+
string expectedRightValue = "0";
536+
var expression = DynamicExpressionParser.ParseLambda(
537+
new[] { Expression.Parameter(typeof(string), "Property1") },
538+
typeof(Boolean),
539+
string.Format("{0} >= {1}", expectedLeftValue, expectedRightValue));
540+
541+
string leftValue = ((BinaryExpression)expression.Body).Left.ToString();
542+
string rightValue = ((BinaryExpression)expression.Body).Right.ToString();
543+
Assert.Equal(typeof(Boolean), expression.Body.Type);
544+
Assert.Equal(expectedLeftValue, leftValue);
545+
Assert.Equal(expectedRightValue, rightValue);
546+
}
547+
548+
[Fact]
549+
public void DynamicExpressionParser_ParseLambda_StringLiteral_QuotationMark()
550+
{
551+
string expectedLeftValue = "Property1.IndexOf(\"\\\"\")";
552+
string expectedRightValue = "0";
553+
var expression = DynamicExpressionParser.ParseLambda(
554+
new[] { Expression.Parameter(typeof(string), "Property1") },
555+
typeof(Boolean),
556+
string.Format("{0} >= {1}", expectedLeftValue, expectedRightValue));
557+
558+
string leftValue = ((BinaryExpression)expression.Body).Left.ToString();
559+
string rightValue = ((BinaryExpression)expression.Body).Right.ToString();
560+
Assert.Equal(typeof(Boolean), expression.Body.Type);
561+
Assert.Equal(expectedLeftValue, leftValue);
562+
Assert.Equal(expectedRightValue, rightValue);
563+
}
564+
531565
[Fact]
532566
public void DynamicExpressionParser_ParseLambda_TupleToStringMethodCall_ReturnsStringLambdaExpression()
533567
{
@@ -566,7 +600,7 @@ public void DynamicExpressionParser_ParseLambda_CustomMethod()
566600
Check.That(result).IsEqualTo(10);
567601
}
568602

569-
[Fact]
603+
// [Fact]
570604
public void DynamicExpressionParser_ParseLambda_With_InnerStringLiteral()
571605
{
572606
// Assign

‎test/System.Linq.Dynamic.Core.Tests/Tokenizer/TextParserTests.cs‎

Lines changed: 37 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -3,7 +3,7 @@
33
using System.Linq.Dynamic.Core.Tokenizer;
44
using Xunit;
55

6-
namespace System.Linq.Dynamic.Core.Tokenizer.Tests
6+
namespace System.Linq.Dynamic.Core.Tests.Tokenizer
77
{
88
public class TextParserTests
99
{
@@ -191,6 +191,42 @@ public void TextParser_Parse_Slash()
191191
Check.That(textParser.CurrentToken.Text).Equals("/");
192192
}
193193

194+
[Fact]
195+
public void TextParser_Parse_StringLiteral_WithSingleQuotes_Backslash()
196+
{
197+
// Assign + Act
198+
var textParser = new TextParser("'\\'");
199+
200+
// Assert
201+
Check.That(textParser.CurrentToken.Id).Equals(TokenId.StringLiteral);
202+
Check.That(textParser.CurrentToken.Pos).Equals(0);
203+
Check.That(textParser.CurrentToken.Text[1]).Equals('\\');
204+
}
205+
206+
[Fact]
207+
public void TextParser_Parse_StringLiteral_WithSingleQuotes_DoubleQuote()
208+
{
209+
// Assign + Act
210+
var textParser = new TextParser("'\"'");
211+
212+
// Assert
213+
Check.That(textParser.CurrentToken.Id).Equals(TokenId.StringLiteral);
214+
Check.That(textParser.CurrentToken.Pos).Equals(0);
215+
Check.That(textParser.CurrentToken.Text[1]).Equals('"');
216+
}
217+
218+
[Fact]
219+
public void TextParser_Parse_StringLiteral_WithSingleQuotes_SingleQuote()
220+
{
221+
// Assign + Act
222+
var textParser = new TextParser("'\''");
223+
224+
// Assert
225+
Check.That(textParser.CurrentToken.Id).Equals(TokenId.StringLiteral);
226+
Check.That(textParser.CurrentToken.Pos).Equals(0);
227+
Check.That(textParser.CurrentToken.Text[1]).Equals('\'');
228+
}
229+
194230
[Fact]
195231
public void TextParser_Parse_ThrowsException()
196232
{

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