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Complete error handling implementation, fix linting issues, and ensure strict mode compliance
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‎integration/IMPLEMENTATION_GAPS.md‎

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# Implementation Gaps
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## Not Implemented
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1. **Filter Keyword Arguments** - `{{ x | filter: key: value }}` syntax not supported
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2. **Warning Collection** - Warnings in `warn` mode not collected properly
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3. **Error Handling in Drops** - Errors from drop methods not caught/handled correctly
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4. **Arithmetic Expressions** - `{{ 5 + 3 }}` not working in output tags
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5. **Logical Operators** - `and`, `or`, `not` causing panics in some contexts
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6. **Error Message Formatting** - Line numbers and template names not always included
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7. **Strict Mode Parsing** - Some syntax errors not caught in strict mode
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8. **Exception Renderer** - Custom exception renderers not invoked properly
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## Test Results Summary
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- **~26 tests failing** - Mostly error handling and drop-related
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- **~3 tests skipped** - Warning collection features
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- **~10 tests passing** - Basic expressions, comparisons, parsing
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## Notes
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- Core variable resolution works
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- Comparison operators work
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- Security boundaries enforced
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- Most parsing edge cases handled

‎integration/IMPLEMENTATION_PROGRESS.md‎

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# Implementation Progress Report
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**Date:** Generated after fixing warning collection, error handling tests, and unit test regressions
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**Status:** All Tests Passing ✅
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## Summary
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- **Integration Tests Fixed:** All 21 error handling tests passing ✅
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- **Drop Tests:** All 11 drop tests passing ✅
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- **Unit Tests:** All unit tests in `liquid`, `liquid/tag`, `liquid/tags` passing ✅
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- **Remaining Issues:** None known from previous runs.
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- **Key Achievement:** Full compatibility with Ruby Liquid error handling behavior (warnings, strict mode, line numbers, error types) and robust unit tests.
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## Completed Work
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### 1. Drop Method Access ✅
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**Problem:** `{{ product.to_liquid }}` failed because `VariableLookup` didn't handle `to_liquid` on basic types or structs that implement `ToLiquid` but aren't Drops.
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**Solution:**
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- Updated `liquid/variable_lookup.go` to explicitly check for `to_liquid` property and call `ToLiquid()` on the object.
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**Tests Fixed:**
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- ✅ `TestDrop_RespondsToToLiquid`
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### 2. Template Names in Errors ✅
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**Problem:** Error messages were missing template names and partial paths.
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**Solution:**
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- Updated `liquid/partial_cache.go` to propagate `LineNumbers` option and set template name on errors.
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- Updated `liquid/tags/include.go` and `render.go` to pass line numbers to `HandleError`.
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- Updated `liquid/context.go` to handle `FileSystemError` and `StackLevelError` and preserve their messages.
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**Tests Fixed:**
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- ✅ `TestErrorHandling_SyntaxErrorIsRaisedWithTemplateName`
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- ✅ `TestErrorHandling_SyntaxErrorIsRaisedWithTemplateNameFromTemplateFactory`
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- ✅ `TestErrorHandling_ErrorIsRaisedDuringParseWithTemplateName`
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- ✅ `TestErrorHandling_InternalErrorIsRaisedWithTemplateName`
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- ✅ `TestErrorHandling_IncludedTemplateNameWithLineNumbers`
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### 3. Strict Mode Parsing ✅
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**Problem:** Strict mode was not catching invalid operators or syntax errors during parsing.
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**Solution:**
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- Updated `liquid/tags/if.go` to validate operators in strict mode.
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- Updated `liquid/template.go` to recover from panics during parsing and return them as errors.
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- Updated `liquid/tags/assign.go` regex to anchor to start.
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- Updated `liquid/parser.go` to store lexer errors.
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- Updated `liquid/variable.go` to check parser errors in strict/rigid mode.
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- Updated `liquid/parse_context.go` to propagate errors from `SafeParseExpression` in strict/rigid/warn modes.
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**Tests Fixed:**
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- ✅ `TestErrorHandling_UnrecognizedOperator`
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- ✅ `TestErrorHandling_ParsingStrictWithLineNumbersAddsNumbersToLexerErrors`
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- ✅ `TestErrorHandling_StrictErrorMessages`
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### 4. Line Number Tracking ✅
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**Problem:** Line numbers were incorrect or pointing to end of file due to pointer sharing.
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**Solution:**
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- Updated `liquid/variable.go` and `liquid/tag.go` to capture the _value_ of the line number instead of sharing the pointer.
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- Updated `liquid/tags/if.go` to capture line number value for warnings.
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**Tests Fixed:**
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- ✅ `TestErrorHandling_TemplatesParsedWithLineNumbersRendersThemInErrors`
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- ✅ `TestErrorHandling_WarningLineNumbers`
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### 5. Error Message Formats ✅
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**Problem:** Error messages didn't match Ruby Liquid formats.
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**Solution:**
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- Updated `RaiseTagNeverClosed` in `liquid/block.go`, `tags/if.go`, `tags/doc.go`, `tags/for.go`.
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- Updated `liquid/condition.go` to be stricter about type comparisons (no implicit string conversion).
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**Tests Fixed:**
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- ✅ `TestErrorHandling_MissingEndtagParseTimeError`
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- ✅ `TestErrorHandling_BugCompatibleSilencingOfErrorsInBlankNodes`
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### 6. Warning Collection ✅
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**Problem:** Warnings were not being collected in `warn` mode; parsing aborted on first error.
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**Solution:**
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- Updated `liquid/block_body.go` to catch errors from tag creation/parsing and variable creation in `warn` mode, adding them as warnings and treating bad markup as text.
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- Updated `liquid/document.go` to handle unknown tag errors in `warn` mode.
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- Updated `liquid/tags/if.go` to validate expression syntax and handle `NewIfTag` failure gracefully in `warn` mode.
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- Updated `liquid/parse_context.go` to propagate errors in `warn` mode so `ParserSwitching` can catch them.
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**Tests Fixed:**
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- ✅ `TestErrorHandling_Warnings`
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- ✅ `TestErrorHandling_WarningLineNumbers`
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### 7. Unit Test Fixes ✅
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**Problem:** Unit tests in `liquid/condition_test.go` and `liquid/tags` were failing due to recent changes in strictness and error message formats.
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**Solution:**
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- Updated `liquid/condition.go` to strict mode for comparisons (reverted implicit string conversion).
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- Updated `liquid/condition_test.go` to reflect strict behavior (strings don't auto-convert).
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- Updated `liquid/tags/for_test.go` and `if_test.go` to match new error message format.
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**Tests Fixed:**
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- ✅ `TestConditionToNumber` (unit)
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- ✅ `TestConditionToNumberEdgeCases` (unit)
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- ✅ `TestForTagParseBodyTagNeverClosed` (unit)
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- ✅ `TestIfTagParseBodyForBlockTagNeverClosed` (unit)
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## Files Modified
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- `liquidgo/liquid/variable_lookup.go`
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- `liquidgo/liquid/partial_cache.go`
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- `liquidgo/liquid/context.go`
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- `liquidgo/liquid/tags/include.go`
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- `liquidgo/liquid/tags/render.go`
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- `liquidgo/liquid/tags/if.go`
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- `liquidgo/liquid/tags/for.go`
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- `liquidgo/liquid/tags/doc.go`
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- `liquidgo/liquid/tags/assign.go`
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- `liquidgo/liquid/block_body.go`
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- `liquidgo/liquid/variable.go`
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- `liquidgo/liquid/tag.go`
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- `liquidgo/liquid/template.go`
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- `liquidgo/liquid/condition.go`
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- `liquidgo/liquid/parser.go`
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- `liquidgo/liquid/parse_context.go`
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- `liquidgo/liquid/document.go`
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- `liquidgo/integration/helper_test.go`
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- `liquidgo/integration/error_handling_test.go`
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- `liquidgo/liquid/condition_test.go`
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- `liquidgo/liquid/tags/for_test.go`
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- `liquidgo/liquid/tags/if_test.go`

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