Fix gherkin-python for compiling example values with trailing backslash

gherkin/CHANGELOG.md

@@ -19,6 +19,7 @@ This document is formatted according to the principles of [Keep A CHANGELOG](htt
 
 ### Fixed
 
+* [C] Fix gherkin-python for compiling example values with trailing backslash ([#2048](https://github.com/cucumber/common/pull/2048), [#1954](https://github.com/cucumber/common/issues/1954))
 * [PHP] Disallow installation of Messages `18.x` ([#2034](https://github.com/cucumber/common/pull/2034))
 
 ## [24.0.0] - 2022-05-31

gherkin/python/gherkin/pickles/compiler.py

@@ -155,9 +155,11 @@ def _interpolate(self, name, variable_cells, value_cells):
 
         for n, variable_cell in enumerate(variable_cells):
             value_cell = value_cells[n]
+            # For the case of trailing backslash, re-escaping backslashes are needed
+            reescaped_value = re.sub(r'\\', r'\\\\', value_cell['value'])
             name = re.sub(
                 u'<{0[value]}>'.format(variable_cell),
-                value_cell['value'],
+                reescaped_value,
                 name
             )
         return name

gherkin/testdata/good/scenario_outline_with_value_with_trailing_backslash.feature

@@ -0,0 +1,10 @@
+Feature: Scenario Outline with values with trailing backslash
+
+Scenario Outline: minimalistic
+    Given <what>
+    When <this>
+    Then <that>
+
+Examples:
+  | what | this  | that   |
+  | x\\y | this\ | that\\ |

gherkin/testdata/good/scenario_outline_with_value_with_trailing_backslash.feature.ast.ndjson

@@ -0,0 +1 @@
+{"gherkinDocument":{"comments":[],"feature":{"children":[{"scenario":{"description":"","examples":[{"description":"","id":"5","keyword":"Examples","location":{"column":1,"line":8},"name":"","tableBody":[{"cells":[{"location":{"column":5,"line":10},"value":"x\\y"},{"location":{"column":12,"line":10},"value":"this\\"},{"location":{"column":20,"line":10},"value":"that\\"}],"id":"4","location":{"column":3,"line":10}}],"tableHeader":{"cells":[{"location":{"column":5,"line":9},"value":"what"},{"location":{"column":12,"line":9},"value":"this"},{"location":{"column":20,"line":9},"value":"that"}],"id":"3","location":{"column":3,"line":9}},"tags":[]}],"id":"6","keyword":"Scenario Outline","location":{"column":1,"line":3},"name":"minimalistic","steps":[{"id":"0","keyword":"Given ","keywordType":"Context","location":{"column":5,"line":4},"text":"<what>"},{"id":"1","keyword":"When ","keywordType":"Action","location":{"column":5,"line":5},"text":"<this>"},{"id":"2","keyword":"Then ","keywordType":"Outcome","location":{"column":5,"line":6},"text":"<that>"}],"tags":[]}}],"description":"","keyword":"Feature","language":"en","location":{"column":1,"line":1},"name":"Scenario Outline with values with trailing backslash","tags":[]},"uri":"../testdata/good/scenario_outline_with_value_with_trailing_backslash.feature"}}

gherkin/testdata/good/scenario_outline_with_value_with_trailing_backslash.feature.pickes.ndjson

@@ -0,0 +1 @@
+{"pickle":{"id":"8","uri":"../testdata/good/scenario_outline_with_value_with_trailing_backslash.feature","name":"minimalistic","language":"en","steps":[{"astNodeIds":["0","3"],"id":"6","type":"Action","text":"what\\"},{"astNodeIds":["1","3"],"id":"7","type":"Outcome","text":"that\\"}],"tags":[],"astNodeIds":["5","3"]}}

gherkin/testdata/good/scenario_outline_with_value_with_trailing_backslash.feature.pickles.ndjson

@@ -0,0 +1 @@
+{"pickle":{"astNodeIds":["6","4"],"id":"10","language":"en","name":"minimalistic","steps":[{"astNodeIds":["0","4"],"id":"7","text":"x\\y","type":"Context"},{"astNodeIds":["1","4"],"id":"8","text":"this\\","type":"Action"},{"astNodeIds":["2","4"],"id":"9","text":"that\\","type":"Outcome"}],"tags":[],"uri":"../testdata/good/scenario_outline_with_value_with_trailing_backslash.feature"}}

gherkin/testdata/good/scenario_outline_with_value_with_trailing_backslash.feature.source.ndjson

@@ -0,0 +1 @@
+{"source":{"data":"Feature: Scenario Outline with values with trailing backslash\n\nScenario Outline: minimalistic\n    Given <what>\n    When <this>\n    Then <that>\n\nExamples:\n  | what | this  | that   |\n  | x\\\\y | this\\ | that\\\\ |","mediaType":"text/x.cucumber.gherkin+plain","uri":"../testdata/good/scenario_outline_with_value_with_trailing_backslash.feature"}}

gherkin/testdata/good/scenario_outline_with_value_with_trailing_backslash.feature.tokens

@@ -0,0 +1,11 @@
+(1:1)FeatureLine:()Feature/Scenario Outline with values with trailing backslash/
+(2:1)Empty://
+(3:1)ScenarioLine:()Scenario Outline/minimalistic/
+(4:5)StepLine:(Context)Given /<what>/
+(5:5)StepLine:(Action)When /<this>/
+(6:5)StepLine:(Outcome)Then /<that>/
+(7:1)Empty://
+(8:1)ExamplesLine:()Examples//
+(9:3)TableRow://5:what,12:this,20:that
+(10:3)TableRow://5:x\y,12:this\,20:that\
+EOF