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feat: add RemoveTag engine method #130

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feat: add RemoveTag engine method #130

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b4afb26
feat: add RemoveTag engine method
Nov 18, 2025
5c93d92
fix: remove value assertion
Nov 18, 2025
aedae6b
fix: rename engine variable in test
jaime-amate Nov 18, 2025
a79eab4
fix: remove not needed tag registration in test
jaime-amate Nov 18, 2025
0922fc8
chore: add description for RemoveTag method
jaime-amate Nov 18, 2025
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8 changes: 8 additions & 0 deletions engine.go
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Original file line number Diff line number Diff line change
Expand Up @@ -173,3 +173,11 @@ func (e *Engine) ParseTemplateAndCache(source []byte, path string, line int) (*T
func (e *Engine) SetAutoEscapeReplacer(replacer render.Replacer) {
e.cfg.SetAutoEscapeReplacer(replacer)
}

// RemoveTag removes the named tag definition from the engine's configuration.
// After calling RemoveTag the tag will no longer be recognized by subsequent
// parsing or rendering operations. The call is idempotent — removing a tag
// that is not registered is a no-op.
func (e *Engine) RemoveTag(name string) {
e.cfg.RemoveTag(name)
}
16 changes: 16 additions & 0 deletions engine_examples_test.go
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Expand Up @@ -305,3 +305,19 @@ func TestIssue63_UnicodeVariableNames(t *testing.T) {
require.Equal(t, "content", string(result))
})
}

func TestRemoveTag(t *testing.T) {
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@osteele osteele Nov 29, 2025

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As a test, this should go in engine_test.go. Or rename it to ExampleEngine_RemoveTag as a testable example.

engine := NewEngine()
engine.RegisterTag("echo", func(c render.Context) (string, error) {
return c.TagArgs(), nil
})
source := `{% echo hello world %}`

_, err := engine.ParseAndRenderString(source, emptyBindings)
require.NoError(t, err)

engine.RemoveTag("echo")

_, err = engine.ParseAndRenderString(source, emptyBindings)
require.Error(t, err)
}
Comment on lines +309 to +323
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Copilot AI Nov 28, 2025

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The test only verifies removing a custom tag (echo), but the PR description specifically mentions removing standard tags like {% include %} to get parse errors. Consider adding a test case that removes a standard tag to ensure this use case works as intended.

Example:

t.Run("RemoveStandardTag", func(t *testing.T) {
    engine := NewEngine()
    source := `{% if true %}test{% endif %}`
    
    _, err := engine.ParseAndRenderString(source, emptyBindings)
    require.NoError(t, err)
    
    engine.RemoveTag("if")
    
    _, err = engine.ParseAndRenderString(source, emptyBindings)
    require.Error(t, err)
})

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5 changes: 5 additions & 0 deletions render/tags.go
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Expand Up @@ -18,3 +18,8 @@ func (c *Config) FindTagDefinition(name string) (TagCompiler, bool) {
td, ok := c.tags[name]
return td, ok
}

// RemoveTag removes a tag definition.
func (c *Config) RemoveTag(name string) {
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@osteele osteele Nov 29, 2025

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Consider whether this should be RemoveTag or UnregisterTag. The first reads better in isolation; the second has better symmetry with RegisterTag.

This is just a question for you, not a requirement for me to accept the PR. I'm okay with either. Don't do both though! This ends up making it harder to work with client code.

delete(c.tags, name)
}