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Sanitize no-break whitespace (U+00A0) in frontmatter before YAML parsing #17262

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Merged
pelikhan merged 3 commits into from
Feb 20, 2026
Merged

Sanitize no-break whitespace (U+00A0) in frontmatter before YAML parsing #17262

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6e6f8af
Initial plan
Copilot Feb 20, 2026
b5b85fe
Sanitize no-break whitespace (U+00A0) in frontmatter before YAML parsing
Copilot Feb 20, 2026
aa4bb5c
Merge branch 'main' into copilot/sanitize-frontmatter-whitespace
pelikhan Feb 20, 2026
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3 changes: 3 additions & 0 deletions pkg/parser/frontmatter_content.go
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Original file line number Diff line number Diff line change
Expand Up @@ -55,6 +55,9 @@ func ExtractFrontmatterFromContent(content string) (*FrontmatterResult, error) {
frontmatterLines := lines[1:endIndex]
frontmatterYAML := strings.Join(frontmatterLines, "\n")

// Sanitize no-break whitespace characters (U+00A0) which break the YAML parser
frontmatterYAML = strings.ReplaceAll(frontmatterYAML, "\u00A0", " ")

// Parse YAML
var frontmatter map[string]any
if err := yaml.Unmarshal([]byte(frontmatterYAML), &frontmatter); err != nil {
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9 changes: 9 additions & 0 deletions pkg/parser/frontmatter_extraction_test.go
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Expand Up @@ -55,6 +55,15 @@ This is a test workflow with empty frontmatter.`,
content: "---\ntitle: Test\nno closing delimiter",
wantErr: true,
},
{
name: "no-break whitespace in values",
content: "---\ntitle:\u00A0Test\u00A0Workflow\nengine:\u00A0copilot\n---\n\n# Content",
wantYAML: map[string]any{
"title": "Test Workflow",
"engine": "copilot",
},
wantMarkdown: "# Content",
},
}

for _, tt := range tests {
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