feat: generate raw strings for python regex

[gankoji]

This PR addresses Issue #129. Repo tests failed locally immediately on the pull, I suspect due to some configuration mistake on my end after the initial clone.

I have tested locally and verified the following:

a) When generating a python parser, regexes for the lex_rules are now generated as raw strings (r'\"a_regex\"')
b) These raw strings, when used in a consuming python program, properly parse tokens without further modification of the generated parser

[DmitrySoshnikov]

Thanks for the PR, this looks good. Can you double-check please the failing tests you mentioned and fix them if this is related?

[gankoji]

I don't expect the tests are actually failing in a sane environment, rather that I have some setup or configuration issue since it's my first pull of the repo. I can take a look tomorrow and see if I can find the cause, but it may be faster to have someone with a known good environment pull this branch and verify the changes don't break anything.

[gankoji]

Finally getting back to this, the issue with tests persists even on a fresh install. I can't see how this could be related to my one liner change at all, but I also don't have the time to sit down and debug the tests.

 FAIL  src/__tests__/code-unit-test.js
  ● Test suite failed to run

    TypeError: /home/***/Workspace/syntax/src/__tests__/code-unit-test.js: Cannot read properties of null (reading 'bindings')

      at Scope.bindings [as moveBindingTo] (node_modules/@babel/traverse/src/scope/index.ts:1261:13)
      at BlockScoping.updateScopeInfo (node_modules/babel-plugin-transform-es2015-block-scoping/lib/index.js:364:17)
      at BlockScoping.run (node_modules/babel-plugin-transform-es2015-block-scoping/lib/index.js:330:12)
      at PluginPass.BlockStatementSwitchStatementProgram (node_modules/babel-plugin-transform-es2015-block-scoping/lib/index.js:70:24)
      at call (node_modules/@babel/traverse/src/visitors.ts:250:21)
      at NodePath.call [as _call] (node_modules/@babel/traverse/src/path/context.ts:34:20)
      at NodePath._call [as call] (node_modules/@babel/traverse/src/path/context.ts:19:17)
      at NodePath.call [as visit] (node_modules/@babel/traverse/src/path/context.ts:92:31)
      at TraversalContext.visit [as visitQueue] (node_modules/@babel/traverse/src/context.ts:144:16)
      at TraversalContext.visitQueue [as visitSingle] (node_modules/@babel/traverse/src/context.ts:108:19)
      at TraversalContext.visitSingle [as visit] (node_modules/@babel/traverse/src/context.ts:176:19)
      at visit (node_modules/@babel/traverse/src/traverse-node.ts:34:17)
      at traverse (node_modules/@babel/traverse/src/index.ts:71:15)
      at transformFile (node_modules/@babel/core/src/transformation/index.ts:119:13)
          at transformFile.next (<anonymous>)
      at transformFile (node_modules/@babel/core/src/transformation/index.ts:47:12)
          at run.next (<anonymous>)
      at transform (node_modules/@babel/core/src/transform.ts:29:20)
          at transform.next (<anonymous>)
      at evaluateSync (node_modules/gensync/index.js:251:28)
      at sync (node_modules/gensync/index.js:89:14)
      at fn (node_modules/@babel/core/src/errors/rewrite-stack-trace.ts:97:14)
      at transformSync (node_modules/@babel/core/src/transform.ts:66:52)
      at ScriptTransformer.transformSource (node_modules/@jest/transform/build/ScriptTransformer.js:519:31)
      at ScriptTransformer._transformAndBuildScript (node_modules/@jest/transform/build/ScriptTransformer.js:648:40)
      at ScriptTransformer.transform (node_modules/@jest/transform/build/ScriptTransformer.js:700:19)

Test Suites: 14 failed, 14 total
Tests:       0 total
Snapshots:   0 total
Time:        2.46 s
Ran all test suites.

Run on Ubuntu 22.04 LTS, Node v16.18.1, NPM 8.19.2

[DmitrySoshnikov]

OK, this might be a local issues. Thanks for the contribution!