feat: raise error for missing closing token

[yeonjuan]

fixes #28

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.91%. Comparing base (7d1dd41) to head (994aca3).

Additional details and impacted files

@@            Coverage Diff            @@
##           main      #31       +/-   ##
=========================================
+ Coverage      0   94.91%   +94.91%     
=========================================
  Files         0       56       +56     
  Lines         0     1140     +1140     
  Branches      0      163      +163     
=========================================
+ Hits          0     1082     +1082     
- Misses        0       58       +58     

Flag	Coverage Δ
unittest	94.91% <100.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/tokenizer/handlers/attributes.ts	100.00% <100.00%> (ø)
src/utils/raise.ts	100.00% <100.00%> (ø)

... and 54 files with indirect coverage changes

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[Copilot]

Pull Request Overview

This PR addresses issue #28 by introducing a new error function to raise a SyntaxError when a closing token is missing. Key changes include:

• Introducing the raise() function in src/utils/raise.ts
• Integrating raise() into the tokenizer attribute handler in src/tokenizer/handlers/attributes.ts to detect missing closing tokens
• Adding a test case in src/tokenizer/tests/tokenize.spec.ts for parsing error handling

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/utils/raise.ts	New function to raise a SyntaxError with precise location info
src/utils/index.ts	Updated exports to include the new raise() function
src/tokenizer/handlers/attributes.ts	Uses raise() to error on missing closing tag
src/tokenizer/tests/tokenize.spec.ts	Adds test coverage for the new error when closing token is absent
src/tokenizer/tests/input/parsing-error-no-open-end.html	Provides test input to trigger the error