[jira] [Created] (THRIFT-4727) javascript compiler generates struct code with duplicate `case 0` statements

["Xiao Wang (JIRA)" <ji...@apache.org>]

Xiao Wang created THRIFT-4727:
---------------------------------

             Summary: javascript compiler generates struct code with duplicate  `case 0` statements
                 Key: THRIFT-4727
                 URL: https://issues.apache.org/jira/browse/THRIFT-4727
             Project: Thrift
          Issue Type: Bug
          Components: JavaScript - Compiler
    Affects Versions: 0.11.0, 0.10.0, 0.9, 0.8, 0.7
            Reporter: Xiao Wang


*Reproducible steps:*

Javascript compiler would always generate duplicate `case 0` codes;

1. Below is a demo IDL file:

 
{code:java}
// test.thrift
struct Obj {
   1: string name;
}

service Test {
   Obj test()
}

{code}
2. Generate code using
{code:java}
thrift -r --gen js:node test.thrift{code}
3. The related problematic code is like below:

 

 
{code:java}
// part of Test.js
......
Test_test_result.prototype.read = function(input) {
  input.readStructBegin();
  while (true)
  {
    var ret = input.readFieldBegin();
    var fname = ret.fname;
    var ftype = ret.ftype;
    var fid = ret.fid;
    if (ftype == Thrift.Type.STOP) {
      break;
    }
    switch (fid)
    {
      case 0:
      if (ftype == Thrift.Type.STRUCT) {
        this.success = new ttypes.Obj();
        this.success.read(input);
      } else {
        input.skip(ftype);
      }
      break;
      case 0:
        input.skip(ftype);
        break;
      default:
        input.skip(ftype);
    }
    input.readFieldEnd();
  }
  input.readStructEnd();
  return;
};
......{code}
*_Root cause:_*

The code makes this bug was imported due to bugfix [THRIFT-1089|https://issues.apache.org/jira/browse/THRIFT-1089].

Commit address:[https://github.com/apache/thrift/commit/da6e6ae91894bc52fc04234fbd2610f8969399f4.]

*_Potential fix:_*

I think remove below code should fix this problem:
{code:java}
if (fields.size() == 1) {
  // pseudo case to make jslint happy
  indent(out) << "case 0:" << endl;
  indent(out) << " input.skip(ftype);" << endl;
  indent(out) << " break;" << endl;
}
{code}
This code seems to satisfy jslint about 8 years ago, but now this also fails the static code scan both in jslint and sonarqube default profile.

 

 



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