Disambiguate whitespace-preceded ">" in HTML attributes

[DylanPiercey]

In HTML mode a > after an unenclosed attribute always closed the tag, so <if=count > 10> silently parsed as <if=count> followed by the text 10> — a chronic trap since both readings are valid. The parser now looks ahead when an attribute ends at whitespace followed by >: if the rest of the line has the shape of a split comparison ending in a > that hugs its final operand (10>, x.length>, 10 && flag/>), it reports an error telling the author to either parenthesize the expression or remove the whitespace before the tag-closing >. Anything the look-ahead does not recognize keeps the existing behavior, so ordinary content like <div class=foo > Hello</div> is unaffected.

Whitespace-preceded >= is now parsed as a comparison operator (matching <=), since a tag close can never be followed by a hugging =.

Additionally, a whitespace-preceded </ after an unenclosed attribute value is now treated as a close tag instead of being consumed as a less-than operand (previously <div class=x + y </div> swallowed the close tag into the value and reported a misleading Missing ending "div" tag); a close tag found before the open tag is completed now reports a targeted error suggesting parentheses. Genuine less-than comparisons (a < b, a < /re/.test(c)) are unaffected.

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🦋 Changeset detected

Latest commit: 2e5d2d0

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
htmljs-parser	Minor

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📥 Commits

Reviewing files that changed from the base of the PR and between 1377b11 and 2e5d2d0.

⛔ Files ignored due to path filters (24)

• src/__tests__/fixtures/attr-ambiguous-right-angle-bracket-arrow/__snapshots__/attr-ambiguous-right-angle-bracket-arrow.expected.txt is excluded by !**/__snapshots__/** and included by **
• src/__tests__/fixtures/attr-ambiguous-right-angle-bracket-bare-equal/__snapshots__/attr-ambiguous-right-angle-bracket-bare-equal.expected.txt is excluded by !**/__snapshots__/** and included by **
• src/__tests__/fixtures/attr-ambiguous-right-angle-bracket-eof/__snapshots__/attr-ambiguous-right-angle-bracket-eof.expected.txt is excluded by !**/__snapshots__/** and included by **
• src/__tests__/fixtures/attr-ambiguous-right-angle-bracket-grouped/__snapshots__/attr-ambiguous-right-angle-bracket-grouped.expected.txt is excluded by !**/__snapshots__/** and included by **
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• src/__tests__/fixtures/attr-ambiguous-right-angle-bracket-name/__snapshots__/attr-ambiguous-right-angle-bracket-name.expected.txt is excluded by !**/__snapshots__/** and included by **
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• src/__tests__/fixtures/attr-ambiguous-right-angle-bracket-regex/__snapshots__/attr-ambiguous-right-angle-bracket-regex.expected.txt is excluded by !**/__snapshots__/** and included by **
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• src/__tests__/fixtures/attr-ambiguous-right-angle-bracket-unmatched-close/__snapshots__/attr-ambiguous-right-angle-bracket-unmatched-close.expected.txt is excluded by !**/__snapshots__/** and included by **
• src/__tests__/fixtures/attr-ambiguous-right-angle-bracket/__snapshots__/attr-ambiguous-right-angle-bracket.expected.txt is excluded by !**/__snapshots__/** and included by **
• src/__tests__/fixtures/attr-close-tag-in-unenclosed-value/__snapshots__/attr-close-tag-in-unenclosed-value.expected.txt is excluded by !**/__snapshots__/** and included by **
• src/__tests__/fixtures/attr-less-than-regex/__snapshots__/attr-less-than-regex.expected.txt is excluded by !**/__snapshots__/** and included by **
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• src/__tests__/fixtures/attr-with-right-angle-bracket-whitespace/__snapshots__/attr-with-right-angle-bracket-whitespace.expected.txt is excluded by !**/__snapshots__/** and included by **

📒 Files selected for processing (31)

• .changeset/close-tag-less-than.md
• .changeset/quiet-pears-refuse.md
• agent-feedback/bugs.md
• src/__tests__/fixtures/attr-ambiguous-right-angle-bracket-arrow/input.marko
• src/__tests__/fixtures/attr-ambiguous-right-angle-bracket-bare-equal/input.marko
• src/__tests__/fixtures/attr-ambiguous-right-angle-bracket-eof/input.marko
• src/__tests__/fixtures/attr-ambiguous-right-angle-bracket-grouped/input.marko
• src/__tests__/fixtures/attr-ambiguous-right-angle-bracket-index-division/input.marko
• src/__tests__/fixtures/attr-ambiguous-right-angle-bracket-logical/input.marko
• src/__tests__/fixtures/attr-ambiguous-right-angle-bracket-name/input.marko
• src/__tests__/fixtures/attr-ambiguous-right-angle-bracket-nested-gte/input.marko
• src/__tests__/fixtures/attr-ambiguous-right-angle-bracket-regex/input.marko
• src/__tests__/fixtures/attr-ambiguous-right-angle-bracket-self-close/input.marko
• src/__tests__/fixtures/attr-ambiguous-right-angle-bracket-string/input.marko
• src/__tests__/fixtures/attr-ambiguous-right-angle-bracket-trailing-space/input.marko
• src/__tests__/fixtures/attr-ambiguous-right-angle-bracket-unbalanced-group/input.marko
• src/__tests__/fixtures/attr-ambiguous-right-angle-bracket-unmatched-close/input.marko
• src/__tests__/fixtures/attr-ambiguous-right-angle-bracket/input.marko
• src/__tests__/fixtures/attr-close-tag-in-unenclosed-value/input.marko
• src/__tests__/fixtures/attr-less-than-regex/input.marko
• src/__tests__/fixtures/attr-less-than/input.marko
• src/__tests__/fixtures/attr-operators-newline-after/input.marko
• src/__tests__/fixtures/attr-operators-newline-before/input.marko
• src/__tests__/fixtures/attr-operators-space-before/input.marko
• src/__tests__/fixtures/attr-operators-space-between/input.marko
• src/__tests__/fixtures/attr-right-angle-bracket-gte/input.marko
• src/__tests__/fixtures/attr-with-right-angle-bracket-whitespace/input.marko
• src/states/ATTRIBUTE.ts
• src/states/EXPRESSION.ts
• src/util/error-code.ts
• src/util/util.ts

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.95%. Comparing base (1377b11) to head (2e5d2d0).

Additional details and impacted files

@@           Coverage Diff            @@
##             main     #234    +/-   ##
========================================
  Coverage   99.95%   99.95%            
========================================
  Files          34       34            
  Lines        4270     4466   +196     
  Branches      793      853    +60     
========================================
+ Hits         4268     4464   +196     
  Misses          2        2            

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