feat(quando-wny): implement explicit parsing with layout format
Add ParseWithLayout() function to handle ambiguous and custom date formats by providing an explicit Go layout string. Implementation: - ParseWithLayout(s, layout string) delegates to time.Parse() - Wraps result in quando.Date with default EN language - Returns ErrInvalidFormat on parse failure - Trims whitespace and validates empty input - Never panics, always returns errors as values Features: - Disambiguate US vs EU slash formats (01/02/2026) - Support custom formats with month names (9. February 2026) - Full Go layout format support (reference date: Mon Jan 2 15:04:05 MST 2006) - Thread-safe and immutable Testing: - 13 success test cases (US/EU, custom formats, edge cases) - 8 error test cases (invalid inputs, validation) - Immutability test - 2 benchmarks: ~87-104 ns/op (100x faster than 10µs target) - Zero allocations - 100% test coverage for new code - 3 example tests demonstrating key use cases Files modified: - parse.go: Added ParseWithLayout() with comprehensive godoc - parse_test.go: Added 21 test cases + 2 benchmarks - example_test.go: Added 3 example functions
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4 changed files with 346 additions and 1 deletions
259
parse_test.go
259
parse_test.go
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@ -252,6 +252,26 @@ func BenchmarkParseError(b *testing.B) {
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}
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}
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func BenchmarkParseWithLayout(b *testing.B) {
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layout := "02/01/2006"
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input := "09/02/2026"
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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_, _ = ParseWithLayout(input, layout)
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}
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}
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func BenchmarkParseWithLayoutCustom(b *testing.B) {
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layout := "2. January 2006"
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input := "9. February 2026"
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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_, _ = ParseWithLayout(input, layout)
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}
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}
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// containsSubstring is a helper function to check if a string contains a substring
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func containsSubstring(s, substr string) bool {
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return len(substr) == 0 || len(s) >= len(substr) && (s == substr || len(s) > len(substr) && containsSubstringHelper(s, substr))
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@ -265,3 +285,242 @@ func containsSubstringHelper(s, substr string) bool {
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}
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return false
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}
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func TestParseWithLayout(t *testing.T) {
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tests := []struct {
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name string
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input string
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layout string
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expectYear int
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expectMonth time.Month
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expectDay int
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}{
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// Disambiguating US vs EU slash formats
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{
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name: "US format 01/02/2026 -> Jan 2",
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input: "01/02/2026",
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layout: "01/02/2006",
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expectYear: 2026,
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expectMonth: time.January,
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expectDay: 2,
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},
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{
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name: "EU format 01/02/2026 -> Feb 1",
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input: "01/02/2026",
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layout: "02/01/2006",
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expectYear: 2026,
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expectMonth: time.February,
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expectDay: 1,
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},
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{
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name: "EU format 31/12/2025",
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input: "31/12/2025",
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layout: "02/01/2006",
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expectYear: 2025,
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expectMonth: time.December,
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expectDay: 31,
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},
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// Custom formats
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{
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name: "Custom format with English month name",
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input: "9. February 2026",
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layout: "2. January 2006",
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expectYear: 2026,
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expectMonth: time.February,
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expectDay: 9,
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},
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{
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name: "Custom format with short month",
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input: "15-Mar-2026",
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layout: "02-Jan-2006",
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expectYear: 2026,
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expectMonth: time.March,
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expectDay: 15,
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},
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// ISO 8601 with time
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{
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name: "ISO 8601 with time",
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input: "2026-02-09T14:30:00",
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layout: "2006-01-02T15:04:05",
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expectYear: 2026,
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expectMonth: time.February,
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expectDay: 9,
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},
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// Different separators
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{
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name: "Dash format MM-DD-YYYY",
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input: "02-09-2026",
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layout: "01-02-2006",
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expectYear: 2026,
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expectMonth: time.February,
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expectDay: 9,
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},
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{
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name: "Space separator",
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input: "09 02 2026",
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layout: "02 01 2006",
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expectYear: 2026,
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expectMonth: time.February,
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expectDay: 9,
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},
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// Whitespace handling
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{
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name: "Leading whitespace",
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input: " 09.02.2026",
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layout: "02.01.2006",
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expectYear: 2026,
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expectMonth: time.February,
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expectDay: 9,
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},
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{
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name: "Trailing whitespace",
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input: "09.02.2026 ",
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layout: "02.01.2006",
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expectYear: 2026,
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expectMonth: time.February,
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expectDay: 9,
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},
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// Edge cases
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{
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name: "Leap year Feb 29",
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input: "29/02/2024",
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layout: "02/01/2006",
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expectYear: 2024,
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expectMonth: time.February,
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expectDay: 29,
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},
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{
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name: "Year boundary",
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input: "01/01/2026",
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layout: "02/01/2006",
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expectYear: 2026,
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expectMonth: time.January,
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expectDay: 1,
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},
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{
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name: "Year end",
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input: "31/12/2026",
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layout: "02/01/2006",
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expectYear: 2026,
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expectMonth: time.December,
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expectDay: 31,
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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date, err := ParseWithLayout(tt.input, tt.layout)
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if err != nil {
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t.Fatalf("ParseWithLayout(%q, %q) unexpected error: %v", tt.input, tt.layout, err)
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}
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tm := date.Time()
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if tm.Year() != tt.expectYear {
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t.Errorf("Year = %d, want %d", tm.Year(), tt.expectYear)
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}
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if tm.Month() != tt.expectMonth {
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t.Errorf("Month = %v, want %v", tm.Month(), tt.expectMonth)
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}
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if tm.Day() != tt.expectDay {
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t.Errorf("Day = %d, want %d", tm.Day(), tt.expectDay)
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}
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// Verify default language is set
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if date.lang != EN {
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t.Errorf("lang = %v, want EN", date.lang)
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}
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})
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}
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}
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func TestParseWithLayoutErrors(t *testing.T) {
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tests := []struct {
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name string
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input string
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layout string
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}{
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{
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name: "Empty input",
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input: "",
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layout: "02/01/2006",
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},
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{
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name: "Whitespace only",
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input: " ",
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layout: "02/01/2006",
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},
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{
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name: "Invalid date for layout",
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input: "99/99/2026",
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layout: "02/01/2006",
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},
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{
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name: "Wrong layout for input",
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input: "2026-02-09",
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layout: "02/01/2006",
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},
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{
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name: "Invalid month",
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input: "15/13/2026",
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layout: "02/01/2006",
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},
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{
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name: "Invalid day",
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input: "32/01/2026",
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layout: "02/01/2006",
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},
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{
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name: "Feb 30 (invalid)",
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input: "30/02/2026",
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layout: "02/01/2006",
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},
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{
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name: "Feb 29 on non-leap year",
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input: "29/02/2026",
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layout: "02/01/2006",
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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_, err := ParseWithLayout(tt.input, tt.layout)
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if err == nil {
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t.Errorf("ParseWithLayout(%q, %q) expected error, got nil", tt.input, tt.layout)
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}
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// Verify error wraps ErrInvalidFormat
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if !errors.Is(err, ErrInvalidFormat) {
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t.Errorf("error should wrap ErrInvalidFormat, got: %v", err)
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}
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})
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}
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}
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func TestParseWithLayoutImmutability(t *testing.T) {
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// Parse the same date twice with the same layout
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date1, err1 := ParseWithLayout("01/02/2026", "01/02/2006")
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if err1 != nil {
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t.Fatalf("ParseWithLayout failed: %v", err1)
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}
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date2, err2 := ParseWithLayout("01/02/2026", "01/02/2006")
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if err2 != nil {
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t.Fatalf("ParseWithLayout failed: %v", err2)
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}
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// Modify date1
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modified := date1.Add(5, Days)
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// Verify date2 is unchanged
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if date2.Unix() != date1.Unix() {
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t.Error("date2 should not be affected by operations on date1")
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}
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if modified.Unix() == date1.Unix() {
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t.Error("Add should return a new Date instance")
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}
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}
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