[BUG] Cannot generate server with invokePackage=Websupport\\InvoiceValidation

[FilipBenco]

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• What's the version of OpenAPI Generator used? 3.2 / 3.3 / 4.0
• Have you search for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Bounty to sponsor the fix (example)

Description

I cannot generate namespace: Websupport\InvoiceValidation for any php server version.

And I received error:

openapi-generator version

OpenAPI declaration file content or url

OpanAPI file is in this bug irrelevant

Command line used for generation

docker run --rm -v ${PWD}:/local openapitools/openapi-generator-cli:v4.0.0-beta2 generate -i /local/openapi.json -g php-slim -o /local --invoker-package Websupport\\InvoiceValidation

Output:

Exception in thread "main" java.lang.RuntimeException: Could not generate model 'Health'
        at org.openapitools.codegen.DefaultGenerator.generateModels(DefaultGenerator.java:498)
        at org.openapitools.codegen.DefaultGenerator.generate(DefaultGenerator.java:897)
        at org.openapitools.codegen.cmd.Generate.run(Generate.java:354)
        at org.openapitools.codegen.OpenAPIGenerator.main(OpenAPIGenerator.java:61)
Caused by: java.util.regex.PatternSyntaxException: Illegal/unsupported escape sequence near index 12
^Websupport\InvoiceValidation\\*(.+)
            ^
        at java.util.regex.Pattern.error(Pattern.java:1955)
        at java.util.regex.Pattern.escape(Pattern.java:2471)
        at java.util.regex.Pattern.atom(Pattern.java:2198)
        at java.util.regex.Pattern.sequence(Pattern.java:2130)
        at java.util.regex.Pattern.expr(Pattern.java:1996)
        at java.util.regex.Pattern.compile(Pattern.java:1696)
        at java.util.regex.Pattern.<init>(Pattern.java:1351)
        at java.util.regex.Pattern.compile(Pattern.java:1028)
        at java.util.regex.Pattern.matches(Pattern.java:1133)
        at java.lang.String.matches(String.java:2121)
        at org.openapitools.codegen.languages.PhpSlimServerCodegen.modelFileFolder(PhpSlimServerCodegen.java:103)
        at org.openapitools.codegen.DefaultGenerator.generateModel(DefaultGenerator.java:306)
        at org.openapitools.codegen.DefaultGenerator.generateModels(DefaultGenerator.java:487)
        ... 3 more

Steps to reproduce

Just type and use your own yaml or json openapi file.

docker run --rm -v ${PWD}:/local openapitools/openapi-generator-cli:v4.0.0-beta2 generate -i /local/openapi.json -g php-slim -o /local --invoker-package Websupport\\InvoiceValidation

Expected output should be all classes under namespace: Websupport\InvoiceValidation

Related issues/PRs

Suggest a fix

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[ackintosh]

@FilipBenco Thanks for this issue!

cc Technical Committee: @jebentier (2017/07), @dkarlovi (2017/07), @mandrean (2017/08), @jfastnacht (2017/09), @ybelenko (2018/07), @renepardon (2018/12)

[vdelau]

I can confirm this bug, with latest 4.0 SNAPSHOT. I used a JSON config file with "Package\\Subpackage" and "Package\u005CSubpackage", both leading to the regexp failure. (And yes, choosing the backslash as a namespace separator might not have been the smartest choice ever of the PHP team.... ;) )

Same problem in 3.4 SNAPSHOT. Using a single element namespace works.

[ackintosh]

@vdelau Thanks for providing the example which reproduce the issue. I'm working on this issue. 💨

[ackintosh]

@FilipBenco @vdelau #2604 has been merged into master! Please give it a try with the latest docker image.