Found problem with backslashes parsing #307

seregvan · 2019-09-18T09:22:54Z

You closed my previous issue as a question so I'm opening a new one.
I think I found the problem in your parsing. I can't see the reason to do this in string literal parsing except the case when I try to find " in the result.

if (next == '"')
{
     NextChar();
}

Because if I use query "contains(\"\\\")" it fails with unterminated literal, but if I change query to "contains(\"\\a\")" it works finding "\a" string. And also if I use "contains(\"\\\\\")" it works with string "\\" (string with two real slashes).

So I think the correct solution will be to remove this if statement and just replace \" to " in the result token if it was a string literal. In this case if user will want to put " in query string it should be escaped inside this string. At least it will not break any existing code.
The better approach will be (in my opinion) to escape all the characters in the string by user and to unescape by parser. That means \\\\ will evaluate to \ and not to \\.
I understand your workaround by using @0 but it's not the case when search string comes outside my app.

The text was updated successfully, but these errors were encountered:

alexweav · 2019-11-15T18:44:06Z

Hello @StefH, I just ran into this issue as well. The filter foo = "\"asdf\"" seems to match the literal including backslashes, and the filter foo = """asdf""", which is the literal format documented on the wiki, causes a parse failure.

Are there any workaround for parsing a dynamic linq lambda which contains a quote, other than substitutions? If not, would you please be able to point me towards this area in the code? I might be able to provide a PR, with some guidance.

StefH · 2019-11-18T06:33:10Z

@alexweav The parsing code is located here:

And some unit tests are defined here:

alexweav · 2019-11-19T18:40:50Z

@StefH I was able to work around this by running an ExpressionVisitor on the parsed lambda which simply calls Regex.Unescape() on all string constants. I wonder if something this simple would solve this issue? It ensures that all escape sequences inside string literals are parsed as escape sequences, not the literal characters. Do you think this is too drastic to apply everywhere?

The regex unescaping ensures that the expression Foo = "ab\"cd" returns true where Foo equals the string ab"cd. Without it, it will only return true where Foo equals ab\"cd with the backslash included.

StefH · 2019-11-19T18:44:16Z

Please make a PullRequest with unit tests or a new sample project.

alexweav · 2019-11-22T18:53:02Z

Test: #325

StefH · 2019-11-25T12:35:03Z

@alexweav and @seregvan Can you please test if version System.Linq.Dynamic.Core.1.0.20-ci-12219.nupkg from MyGet solves your issue?

StefH · 2019-11-25T18:14:33Z

@hypetsch and @SolidWhiteSven : you also where involved in string parsing issues, can you also verify if this fix is also in line with your usage?

ghost · 2019-11-26T07:37:36Z

Hey, I've updated to 1.0.20-ci-12230 and all my tests were successful.
Thanks by the was for keeping this package nice and updated :-)

StefH · 2019-11-26T07:46:38Z

@SolidWhiteSven The version you mention is a different one, you need System.Linq.Dynamic.Core.1.0.20-ci-12219.

ghost · 2019-11-26T08:02:51Z

Ah, I see, thought the changes were also included there.
Retested with version 12219 and it all still works as expected.

StefH · 2020-01-10T08:29:36Z

Closing as solved in PR #326

StefH · 2020-01-10T08:37:25Z

@alexweav --> Can you please test if version System.Linq.Dynamic.Core.1.0.20-ci-12219.nupkg from MyGet solves your issue?

rppmartinsCollab · 2020-01-23T16:08:32Z

@alexweav --> Can you please test if version System.Linq.Dynamic.Core.1.0.20-ci-12219.nupkg from MyGet solves your issue?

Hi, testing this version, the problem persists.
When doing something like

query.Where("name.contains(" \ ")")

, I´ve got System.Linq.Dynamic.Core.Exceptions.ParseException: 'Syntax error ' \ ' '.

Can you help me with this?

StefH · 2020-02-24T06:33:47Z

@rppmartinsCollab To be able to use Contains to check if a string contains a \, you need code like:

query.Where("name.contains(\"\\\")")

Escape the " with \"
Escape the \ with \\

Does this work for you?

StefH · 2020-02-24T06:35:57Z

@alexweav, @seregvan and @hypetsch : If you have time, please double check if the updated NuGet (System.Linq.Dynamic.Core.1.0.20-ci-12219) works ok for you.

rppmartinsCollab · 2020-02-24T10:15:53Z

@rppmartinsCollab To be able to use Contains to check if a string contains a \, you need code like:
query.Where("name.contains(\"\\\")")
Escape the " with \"

Escape the \ with \\

Does this work for you?

Hey, thanks for the response.

This way I get the error "Syntax error ' \\ ' " once TextParser does not recognize the character.

StefH · 2020-02-24T10:35:15Z

@rppmartinsCollab Sorry for the confusion, you actually need to escape the \ twice. So \\\\.
For example see https://github.com/StefH/System.Linq.Dynamic.Core/pull/326/files#diff-d7a1783411cc2e7ca08b15984ed427c9R33

rppmartinsCollab · 2020-02-24T10:57:42Z

@rppmartinsCollab Sorry for the confusion, you actually need to escape the \ twice. So \\\\.
For example see https://github.com/StefH/System.Linq.Dynamic.Core/pull/326/files#diff-d7a1783411cc2e7ca08b15984ed427c9R33

The problem seems to be in scaping the quote character, I get error in \"

silarmani · 2020-03-18T13:34:45Z

Hello guys,

I've just upgraded it to 1.0.21 via nuget and I can confirm that the issue still exists.

It only breaks if the filter is a check for a single backslash

e.g. #1 if I search for \t ["Studyname.Contains(\"\\t\")"], EF produces the correct condition

exec sp_executesql N'SELECT [e.Studytype].[ParentID], [e.Studytype].[ChildID], [e.Studytype].[idx], [t].[SYSIDENT], [t].[tdid]
FROM [RV_riskstudytype_STUDIES] AS [e.Studytype]
INNER JOIN (
    SELECT [e0].[SYSIDENT], [e0].[tdid]
    FROM [RV_riskstudy] AS [e0]
    LEFT JOIN [RV_project_PROJECTSTUDIES] AS [jSTUDYPROJECT0] ON [e0].[tdid] = [jSTUDYPROJECT0].[ChildID]
    LEFT JOIN [RV_riskstudytype_STUDIES] AS [jSTUDYTYPE0] ON [e0].[tdid] = [jSTUDYTYPE0].[ChildID]
    WHERE ([e0].[rid] IN (''0'', @__registerUuid_0) AND [e0].[STUDY_STATUS] NOT IN (9, 3)) AND (CHARINDEX(N''\t'', [e0].[STUDYNAME]) > 0)
    ORDER BY [e0].[SYSIDENT], [e0].[tdid]
    OFFSET @__p_1 ROWS FETCH NEXT @__p_2 ROWS ONLY
) AS [t] ON [e.Studytype].[ChildID] = [t].[tdid]
ORDER BY [t].[SYSIDENT], [t].[tdid]',N'@__registerUuid_0 varchar(160),@__p_1 int,@__p_2 int',@__registerUuid_0='3.1.1.risk-register.da7ecd5e8ecc4c91ab3f5fa2a0686346',@__p_1=0,@__p_2=25

e.g. #2 if I search for \\ ["Studyname.Contains(\"\\\\\")"], EF produces the correct condition (i.e. text with single backslashes do not match)

exec sp_executesql N'SELECT [e.Studytype.RiskstudyType].[tdid], [e.Studytype.RiskstudyType].[CODE], [e.Studytype.RiskstudyType].[DESCRIPTION], [e.Studytype.RiskstudyType].[SYSIDENT], [e.Studytype.RiskstudyType].[rid], [e.Studytype.RiskstudyType].[STATUS], [e.Studytype.RiskstudyType].[STUDYTYPEAPPROACH], [e.Studytype.RiskstudyType].[STUDYTYPENAME], [e.Studytype.RiskstudyType].[STUDYTYPEOPTIONS], [e.Studytype.RiskstudyType].[STUDYTYPESTRUCTURE], [e.Studytype.RiskstudyType].[SYSCODE]
FROM (
    SELECT [e].*
    FROM [RV_riskstudy] AS [e]
    LEFT JOIN [RV_project_PROJECTSTUDIES] AS [jSTUDYPROJECT] ON [e].[tdid] = [jSTUDYPROJECT].[ChildID]
    LEFT JOIN [RV_riskstudytype_STUDIES] AS [jSTUDYTYPE] ON [e].[tdid] = [jSTUDYTYPE].[ChildID]
    WHERE ([e].[rid] IN (''0'', @__registerUuid_0) AND [e].[STUDY_STATUS] NOT IN (9, 3)) AND (CHARINDEX(N''\\'', [e].[STUDYNAME]) > 0)
    ORDER BY [e].[SYSIDENT]
    OFFSET @__p_1 ROWS FETCH NEXT @__p_2 ROWS ONLY
) AS [t]
INNER JOIN [RV_riskstudytype_STUDIES] AS [e.Studytype] ON [t].[tdid] = [e.Studytype].[ChildID]
INNER JOIN [RV_riskstudytype] AS [e.Studytype.RiskstudyType] ON [e.Studytype].[ParentID] = [e.Studytype.RiskstudyType].[tdid]
ORDER BY [e.Studytype].[idx]',N'@__registerUuid_0 varchar(160),@__p_1 int,@__p_2 int',@__registerUuid_0='3.1.1.risk-register.da7ecd5e8ecc4c91ab3f5fa2a0686346',@__p_1=0,@__p_2=25

e.g. #3 if I search for \ [""Studyname.Contains(\"\\\")""], dynamic core throws exception

System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.Linq.Dynamic.Core.Exceptions.ParseException: Unterminated string literal
at System.Linq.Dynamic.Core.Tokenizer.TextParser.NextToken() in C:\Users\azurestef\Documents\Github\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Tokenizer\TextParser.cs:line 361
at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseArgumentList() in C:\Users\azurestef\Documents\Github\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 1846
at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseMemberAccess(Type type, Expression instance) in C:\Users\azurestef\Documents\Github\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 1633
at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParsePrimary() in C:\Users\azurestef\Documents\Github\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 744
at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseUnary() in C:\Users\azurestef\Documents\Github\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 733
at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseMultiplicative() in C:\Users\azurestef\Documents\Github\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 679
at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseAdditive() in C:\Users\azurestef\Documents\Github\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 648
at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseShiftOperator() in C:\Users\azurestef\Documents\Github\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 624
at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseComparisonOperator() in C:\Users\azurestef\Documents\Github\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 433
at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseLogicalAndOrOperator() in C:\Users\azurestef\Documents\Github\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 378
at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseIn() in C:\Users\azurestef\Documents\Github\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 298
at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseAndOperator() in C:\Users\azurestef\Documents\Github\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 281
at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseOrOperator() in C:\Users\azurestef\Documents\Github\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 263
at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseLambdaOperator() in C:\Users\azurestef\Documents\Github\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 243
at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseNullCoalescingOperator() in C:\Users\azurestef\Documents\Github\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 230
at System.Linq.Dynamic.Core.Parser.ExpressionParser.ParseConditionalOperator() in C:\Users\azurestef\Documents\Github\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 213
at System.Linq.Dynamic.Core.Parser.ExpressionParser.Parse(Type resultType, Boolean createParameterCtor) in C:\Users\azurestef\Documents\Github\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\Parser\ExpressionParser.cs:line 152
at System.Linq.Dynamic.Core.DynamicExpressionParser.ParseLambda(ParsingConfig parsingConfig, Boolean createParameterCtor, ParameterExpression[] parameters, Type resultType, String expression, Object[] values) in C:\Users\azurestef\Documents\Github\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\DynamicExpressionParser.cs:line 67
at System.Linq.Dynamic.Core.DynamicQueryableExtensions.Where(IQueryable source, ParsingConfig config, String predicate, Object[] args) in C:\Users\azurestef\Documents\Github\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\DynamicQueryableExtensions.cs:line 2276
at System.Linq.Dynamic.Core.DynamicQueryableExtensions.Where[TSource](IQueryable1 source, ParsingConfig config, String predicate, Object[] args) in C:\Users\azurestef\Documents\Github\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\DynamicQueryableExtensions.cs:line 2248 at System.Linq.Dynamic.Core.DynamicQueryableExtensions.Where[TSource](IQueryable1 source, String predicate, Object[] args) in C:\Users\azurestef\Documents\Github\System.Linq.Dynamic.Core\src\System.Linq.Dynamic.Core\DynamicQueryableExtensions.cs:line 2254

StefH · 2020-03-18T13:53:30Z

@silarmani Did you use latest from normal NuGet ?
This will not yet work.

Can you please try version System.Linq.Dynamic.Core.1.0.20-ci-12980.nupkg from MyGet ?

silarmani · 2020-03-18T15:57:32Z

@StefH, yes, it does, as long as I escape all backlashes, which makes sense.

For clarity for everyone I am going to repeat all the scenarios I ran before but with this special version and then show the new queries in EF

e.g. #1 if I search for \t ["Studyname.Contains(\"\\\\t\")"], EF produces the correct condition

exec sp_executesql N'SELECT [e].[tdid]
FROM [RV_riskstudy] AS [e]
LEFT JOIN [RV_project_PROJECTSTUDIES] AS [jSTUDYPROJECT] ON [e].[tdid] = [jSTUDYPROJECT].[ChildID]
LEFT JOIN [RV_riskstudytype_STUDIES] AS [jSTUDYTYPE] ON [e].[tdid] = [jSTUDYTYPE].[ChildID]
WHERE ([e].[rid] IN (''0'', @__registerUuid_0) AND [e].[STUDY_STATUS] NOT IN (9, 3)) AND (CHARINDEX(N''\t'', [e].[STUDYNAME]) > 0)
ORDER BY [e].[SYSIDENT], [e].[tdid]
OFFSET @__p_1 ROWS FETCH NEXT @__p_2 ROWS ONLY',N'@__registerUuid_0 varchar(160),@__p_1 int,@__p_2 int',@__registerUuid_0='3.1.1.risk-register.da7ecd5e8ecc4c91ab3f5fa2a0686346',@__p_1=0,@__p_2=25

e.g. #2 if I search for \\ ["Studyname.Contains(\"\\\\\\\\\")"], EF produces the correct condition (i.e. text with single backslashes does not match)

exec sp_executesql N'SELECT [e].[tdid]
FROM [RV_riskstudy] AS [e]
LEFT JOIN [RV_project_PROJECTSTUDIES] AS [jSTUDYPROJECT] ON [e].[tdid] = [jSTUDYPROJECT].[ChildID]
LEFT JOIN [RV_riskstudytype_STUDIES] AS [jSTUDYTYPE] ON [e].[tdid] = [jSTUDYTYPE].[ChildID]
WHERE ([e].[rid] IN (''0'', @__registerUuid_0) AND [e].[STUDY_STATUS] NOT IN (9, 3)) AND (CHARINDEX(N''\\'', [e].[STUDYNAME]) > 0)
ORDER BY [e].[SYSIDENT], [e].[tdid]
OFFSET @__p_1 ROWS FETCH NEXT @__p_2 ROWS ONLY',N'@__registerUuid_0 varchar(160),@__p_1 int,@__p_2 int',@__registerUuid_0='3.1.1.risk-register.da7ecd5e8ecc4c91ab3f5fa2a0686346',@__p_1=0,@__p_2=25

e.g. #3 if I search for \ ["Studyname.Contains(\"\\\\\")"], EF produces the correct condition (i.e. text with either single or bouble backslashes matches)

exec sp_executesql N'SELECT [e].[tdid]
FROM [RV_riskstudy] AS [e]
LEFT JOIN [RV_project_PROJECTSTUDIES] AS [jSTUDYPROJECT] ON [e].[tdid] = [jSTUDYPROJECT].[ChildID]
LEFT JOIN [RV_riskstudytype_STUDIES] AS [jSTUDYTYPE] ON [e].[tdid] = [jSTUDYTYPE].[ChildID]
WHERE ([e].[rid] IN (''0'', @__registerUuid_0) AND [e].[STUDY_STATUS] NOT IN (9, 3)) AND (CHARINDEX(N''\'', [e].[STUDYNAME]) > 0)
ORDER BY [e].[SYSIDENT], [e].[tdid]
OFFSET @__p_1 ROWS FETCH NEXT @__p_2 ROWS ONLY',N'@__registerUuid_0 varchar(160),@__p_1 int,@__p_2 int',@__registerUuid_0='3.1.1.risk-register.da7ecd5e8ecc4c91ab3f5fa2a0686346',@__p_1=0,@__p_2=25

silarmani · 2020-03-18T16:02:41Z

I have also tested permutations using backslashes and double quotes and they all work flawlessly.

Is there a plan for making it available in the next release via NuGet?

silarmani · 2020-03-18T16:05:52Z

e.g. #4 if I search for \" ["Studyname.Contains(\"\\\\\\\"\")"], EF produces the correct condition

exec sp_executesql N'SELECT [e].[tdid]
FROM [RV_riskstudy] AS [e]
LEFT JOIN [RV_project_PROJECTSTUDIES] AS [jSTUDYPROJECT] ON [e].[tdid] = [jSTUDYPROJECT].[ChildID]
LEFT JOIN [RV_riskstudytype_STUDIES] AS [jSTUDYTYPE] ON [e].[tdid] = [jSTUDYTYPE].[ChildID]
WHERE ([e].[rid] IN (''0'', @__registerUuid_0) AND [e].[STUDY_STATUS] NOT IN (9, 3)) AND (CHARINDEX(N''\"'', [e].[STUDYNAME]) > 0)
ORDER BY [e].[SYSIDENT], [e].[tdid]
OFFSET @__p_1 ROWS FETCH NEXT @__p_2 ROWS ONLY',N'@__registerUuid_0 varchar(160),@__p_1 int,@__p_2 int',@__registerUuid_0='3.1.1.risk-register.da7ecd5e8ecc4c91ab3f5fa2a0686346',@__p_1=0,@__p_2=25

StefH · 2020-03-18T16:23:10Z

@silarmani Thanks for extended testing!

I want to release this to normal NuGet, however I think I need to change the version from this library to 1.1 because it can be a breaking change.

Also I'm doubting if I should add a new dependency (<PackageReference Include="Sprache.Signed" Version="2.2.0" />) or that I should copy these source files into my library ?

silarmani · 2020-03-18T16:29:36Z

Yes, it is breaking change. I would changed it to 1.1.

e.g. the syntax for searching for \t changed from ["Studyname.Contains(\"\\t\")"] to ["Studyname.Contains(\"\\\\t\")"]

In regards to adding a new dependency, I don't see it as a problem.

I'll stick with the pre-release for now since it doesn't break anything so far.

Thank you!!!

StefH · 2020-04-23T13:40:00Z

External dependency to Sprache which was introduced is reverted.
All the string parsing code is now in this project.

New version (1.1) will be released in some days.

alexweav mentioned this issue Nov 22, 2019

Add test for escape sequences within string literals #325

Closed

StefH mentioned this issue Nov 25, 2019

Fixes for parsing escaped / quoted strings #326

Merged

StefH added the bug label Jan 10, 2020

StefH self-assigned this Jan 10, 2020

StefH closed this as completed Jan 10, 2020

StefH reopened this Jan 10, 2020

StefH closed this as completed Apr 23, 2020

brettwinters mentioned this issue Apr 1, 2024

Parser interpreting the two consecutive escape sequences \"\" as a single escape sequence #786

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Found problem with backslashes parsing #307

Found problem with backslashes parsing #307

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Found problem with backslashes parsing #307

Found problem with backslashes parsing #307

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