Fix bugs in omit-needless-words

[simonw]

• Fix variable shadowing: rename inner text to deltaText to avoid
  shadowing the function parameter
• Fix word count statistics: count actual words inside tags
  instead of just counting the number of elements (a single tag
  like in order contains 2 words, not 1)

[claude]

Claude finished @simonw's task —— View job

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Pull Request Review

Overview

This PR contains two well-targeted bug fixes for the omit-needless-words functionality. Both issues were correctly identified and resolved with appropriate solutions.

Fixed Issues Analysis

✅ Variable Shadowing Fix (omit-needless-words.html:872-876)

Problem: Inner variable text shadowed the function parameter text in analyzeTextStream().
Solution: Renamed inner variable to deltaText to avoid confusion.
Assessment: Excellent fix. This eliminates potential confusion and makes the code more maintainable. The name deltaText is semantically accurate as it represents the incremental text delta from the stream.

✅ Word Count Statistics Fix (omit-needless-words.html:902-908)

Problem: Statistics incorrectly counted number of <del> elements rather than actual words within those elements.
Solution: Added proper word counting logic that splits textContent by whitespace.
Assessment: Critical bug fix. A <del> tag containing "in order to" was being counted as 1 word instead of 3, leading to misleading statistics.

✅ Text Substitution Bug Fix (omit-needless-words.html:806)

Problem: String.prototype.replace() interprets special patterns ($&, $', $$, etc.) in replacement strings.
Solution: Use function callback to return text literally without pattern interpretation.
Assessment: Important security/data integrity fix. User input containing $& patterns would be corrupted during prompt generation.

Code Quality Assessment

✅ Strengths:

• Clean, focused fixes that address specific issues without unnecessary changes
• Proper variable naming (deltaText vs generic text)
• Helpful comments explaining the reasoning behind changes
• Consistent code style maintained throughout

✅ Best Practices:

• Good separation of concerns - each fix addresses one specific issue
• Defensive programming approach (filtering empty strings in word counting)
• Clear variable semantics improve code readability

Security & Performance

✅ Security:

• Text substitution fix prevents potential injection/corruption issues
• No exposure of sensitive data or API keys
• Input sanitization remains intact in renderText()

✅ Performance:

• Minimal performance impact from changes
• Word counting is only done once at completion, not during streaming
• Function callback for replace() has negligible overhead

Test Coverage Considerations

⚠️ Missing Tests:
While the fixes are solid, consider adding tests for:

• Text containing replacement patterns ($&, $', etc.)
• Multi-word <del> elements for statistics accuracy
• Variable shadowing scenarios (less critical but good for regression)

The HTML file appears to be a standalone tool without a formal test suite, which is acceptable for this type of utility.

Final Assessment

Recommendation: ✅ APPROVE

These are high-quality, well-reasoned bug fixes that:

1. Solve real functional issues
2. Improve code clarity and maintainability
3. Follow JavaScript best practices
4. Include helpful comments explaining the changes

The fixes are conservative, targeted, and unlikely to introduce regressions. The variable naming improvement and text substitution security fix are particularly commendable.

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