fix: rewrite author-context exemption using the Handlebars AST - #908
fix: rewrite author-context exemption using the Handlebars AST#908wakqasahmed wants to merge 2 commits into
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…ost#365) Supersedes TryGhost#891, addressing maintainer feedback: this reuses the existing ast-linter infrastructure (lib/ast-linter/parser.js) instead of hand-rolled regex tokenizing over raw template text. getAuthorCheckableContent() now parses each .hbs file with Handlebars.parseWithoutProcessing and recursively walks the resulting AST to find text/mustache ranges inside an {{#is "author"}} (or negated {{^is}}) block, rather than simulating block nesting with a flat regex+stack scan. Block nesting is structural in the AST, so this handles every edge case the prior regex tokenizer needed manual state tracking for: nested {{#if}}/ {{#unless}}, {{#foreach}}/{{#each}} shadowing, {{else}} branches, negated {{^is}}, comments that merely mention {{#is "author"}}, and multi-condition {{#is "a, b"}} (an OR, not necessarily author context). Falls back to the original content unchanged if the template fails to parse, matching the check's existing tolerance for malformed templates elsewhere. authorTagRegex, currentExempt, and the manual token-stack logic are removed as dead code. Same behavior, verified against the full regression fixture set from TryGhost#891's review (multi-condition, else-branch, foreach-shadow, comment-not-a-block, bare-author-helper, if-unless-nested) - all still pass unchanged.
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Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review. WalkthroughThe deprecation checker parses templates for author-context-aware rules. It preserves applicable author branches before applying rule regexes and uses raw content for other rules or parse failures. Tests and fixtures cover valid author blocks, alternate branches, loops, comments, multi-condition blocks, and nested conditions. Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: ⚪ Minimal · up to This change replaces author-context detection with AST-based handling and preserves exemptions through nested author conditions while clearing them in loops. The covered regression cases and passing test suite indicate no remaining merge-blocking risk. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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In `@lib/checks/001-deprecations.js`:
- Line 78: Update the walkProgram call in the nested is-branch handling to
propagate the enclosing exempt state through both branches, while still clearing
the exemption when entering loops. Preserve existing negation and inLoop
behavior so author-context expressions remain exempt inside nested is blocks.
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lib/checks/001-deprecations.jstest/001-deprecations.test.jstest/fixtures/themes/001-deprecations/v6/invalid-author-is-context-edge-cases/bare-author-helper.hbstest/fixtures/themes/001-deprecations/v6/invalid-author-is-context-edge-cases/comment-not-a-block.hbstest/fixtures/themes/001-deprecations/v6/invalid-author-is-context-edge-cases/else-branch.hbstest/fixtures/themes/001-deprecations/v6/invalid-author-is-context-edge-cases/foreach-shadow.hbstest/fixtures/themes/001-deprecations/v6/invalid-author-is-context-edge-cases/if-unless-nested.hbstest/fixtures/themes/001-deprecations/v6/invalid-author-is-context-edge-cases/multi-condition.hbstest/fixtures/themes/001-deprecations/v6/valid-author-is-context/default.hbs
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walkProgram was clearing the exempt flag for both branches of any nested
{{#is}} block, not just when entering a loop. That meant {{author.name}}
inside e.g. {{#is "author"}}{{#is "paged"}}...{{/is}}{{/is}} was still
eligible for deprecation matching, even though the nested is block doesn't
change the author context established by the enclosing block.
Only clear exempt when entering a loop; propagate it unchanged through
both branches of a nested is.
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Replaces #891, which @troyciesco closed - the regex-tokenizer approach in that PR had too much back-and-forth to review, and an AST-based rewrite made more sense than merging something that'd need redoing anyway. This is that rewrite.
getAuthorCheckableContent()in001-deprecations.jsused to simulate Handlebars block nesting by hand with a regex scan and a manual stack. It now parses the template withlib/ast-linter/parser.js(already used elsewhere in this repo) and walks the real AST to find which text/mustache ranges fall inside an{{#is "author"}}(or negated{{^is}}) block. Nesting is structural in the AST, so this handles{{#if}}/{{#unless}},{{#foreach}}/{{#each}}shadowing,{{else}}branches, comments that just mention{{#is "author"}}in passing, and multi-condition{{#is "a, b"}}without any manual state tracking. Falls back to the original content if a template fails to parse.Same behavior as before - verified against the full fixture set from #891's review (multi-condition, else-branch, foreach-shadow, comment-not-a-block, bare-author-helper, if-unless-nested), all still passing.
authorTagRegexand the stack-tracking helpers are gone since nothing uses them anymore.