Intermediate changes

commit_hash:9f456514216b568e1c58c25d3902d410da1e76cf

2 files changed, 36 insertions, 1 deletions

diff --git a/yql/essentials/public/fastcheck/format.cpp b/yql/essentials/public/fastcheck/format.cpp
index d4717b4bf79..b487c56fc19 100644
--- a/yql/essentials/public/fastcheck/format.cpp
+++ b/yql/essentials/public/fastcheck/format.cpp
@@ -25,6 +25,21 @@ TString NormalizeEOL(TStringBuf input) {
     return res;
 }
 
+TString ReplaceHidden(TStringBuf input) {
+    TStringBuilder res;
+    for (const auto c : input) {
+        if (c == ' ') {
+            res << "\xe2\x80\xa2";
+        } else if (c == '\t') {
+            res << "\xe2\x86\x92";
+        } else {
+            res << c;
+        }
+    }
+
+    return res;
+}
+
 class TFormatRunner : public ICheckRunner {
 public:
     TString GetCheckName() const final {
@@ -107,7 +122,7 @@ private:
             }
 
             auto issue = TIssue(origPos, TStringBuilder() <<
-                "Format mismatch, expected:\n" << formattedSample << "\nbut got:\n" << origSample);
+                "Format mismatch, expected:\n" << ReplaceHidden(formattedSample) << "\nbut got:\n" << ReplaceHidden(origSample) << "\n");
             issue.SetCode(EYqlIssueCode::TIssuesIds_EIssueCode_WARNING, ESeverity::TSeverityIds_ESeverityId_S_WARNING);
             res.Issues.AddIssue(issue);
         }
diff --git a/yql/essentials/public/fastcheck/linter_ut.cpp b/yql/essentials/public/fastcheck/linter_ut.cpp
index c0315d20cf3..c7f7cb45d20 100644
--- a/yql/essentials/public/fastcheck/linter_ut.cpp
+++ b/yql/essentials/public/fastcheck/linter_ut.cpp
@@ -173,6 +173,26 @@ Y_UNIT_TEST_SUITE(TLinterTests) {
         UNIT_ASSERT_VALUES_EQUAL(pos.Column, 13);
     }
 
+    Y_UNIT_TEST(BadFormatYqlHidden) {
+        TChecksRequest request;
+        request.Program = "select\t1 ";
+        request.Syntax = ESyntax::YQL;
+        request.Filters.ConstructInPlace();
+        request.Filters->push_back(TCheckFilter{.CheckNameGlob = "format"});
+        auto res = RunChecks(request);
+        UNIT_ASSERT_VALUES_EQUAL(res.Checks.size(), 1);
+        UNIT_ASSERT_VALUES_EQUAL(res.Checks[0].CheckName, "format");
+        UNIT_ASSERT(!res.Checks[0].Success);
+        UNIT_ASSERT_NO_DIFF(res.Checks[0].Issues.ToString(),
+            "<main>:1:0: Warning: Format mismatch, expected:\n"
+            "SELECT\n"
+            "••••1\n"
+            ";\n\n"
+            "but got:\n"
+            "select→1•\n"
+            ", code: 3\n");
+    }
+
     Y_UNIT_TEST(GoodParserSExpr) {
         TChecksRequest request;
         request.Program = "((return world))";