feat(quando-95w): implement custom layout formatting with i18n support
Add FormatLayout() method enabling custom date formatting using Go's standard layout format (Mon Jan 2 15:04:05 MST 2006) with full internationalization support for month and weekday names. Key features: - Custom layout strings using Go's time.Format() reference date - i18n support for EN and DE languages - Translates both full and abbreviated month/weekday names - Fast path for EN (direct passthrough, ~144-173 ns/op) - Optimized replacements using strings.NewReplacer (~7.3-7.5 µs/op for DE) - Comprehensive test coverage (97.6%) Implementation: - Added FormatLayout() method to format.go - Uses strings.NewReplacer for atomic replacements to avoid substring collisions - Added 280+ lines of tests covering all months, weekdays, and edge cases - Added 4 benchmark tests (all meet <10µs target) - Added 4 example tests demonstrating usage Performance: - EN (fast path): ~144-173 ns/op - DE (with i18n): ~7.3-7.5 µs/op - Both well under <10µs requirement Files changed: - format.go: Added FormatLayout() method with full godoc - format_test.go: Added comprehensive tests and benchmarks - example_test.go: Added 4 example functions
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{"id":"quando-6x3","title":"Documentation and examples","description":"Complete documentation including README, godoc, and example code.\n\n**README.md Contents:**\n- Project overview and vision\n- Installation instructions (go get)\n- Quick start examples\n- Core features showcase\n- Performance characteristics\n- Comparison to time.Time\n- Contributing guidelines\n- License\n\n**Godoc Requirements:**\n- Every exported type/function documented\n- Godoc comments start with type/function name\n- Complex behaviors explained (month-end overflow, DST, etc.)\n- Edge cases noted where applicable\n\n**Example Tests:**\n- Example_basicArithmetic\n- Example_monthEndOverflow\n- Example_snapOperations\n- Example_diffCalculation\n- Example_humanFormat\n- Example_parsing\n- Example_formatting\n- Example_timezoneConversion\n- Example_chainedOperations\n\n**Code Examples in README:**\n- Complex chaining\n- Month-end handling\n- Human-readable diffs\n- Timezone-aware operations\n- Comparison with stdlib\n\n## Acceptance Criteria\n- [ ] README.md complete with all sections\n- [ ] Installation instructions clear\n- [ ] At least 5 code examples in README\n- [ ] All exported items have godoc comments\n- [ ] Godoc comments follow conventions (name first)\n- [ ] At least 8 example tests\n- [ ] Examples demonstrate key features\n- [ ] Edge cases documented in relevant godoc\n- [ ] Comparison table with time.Time\n- [ ] Contributing guidelines (if open source)","status":"open","priority":3,"issue_type":"task","owner":"mail@oliverjakoubek.de","created_at":"2026-02-11T16:22:45.693695262+01:00","created_by":"Oliver Jakoubek","updated_at":"2026-02-11T16:22:45.693695262+01:00","dependencies":[{"issue_id":"quando-6x3","depends_on_id":"quando-r1o","type":"blocks","created_at":"2026-02-11T16:23:16.222906911+01:00","created_by":"Oliver Jakoubek"}]}
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{"id":"quando-7m5","title":"MustParse convenience function","description":"Implement MustParse() convenience function that panics on error (for tests/initialization).\n\n**API:**\n```go\nfunc MustParse(s string) Date\n```\n\n**Behavior:**\n- Calls Parse() internally\n- Returns Date on success\n- Panics on error (with clear panic message)\n\n**Use Cases:**\n- Test fixtures\n- Static initialization\n- Configuration files where values are known-good\n\n**Documentation:**\n- MUST clearly document that this function panics\n- MUST recommend using Parse() in production code\n- MUST show test usage examples\n\n## Acceptance Criteria\n- [ ] MustParse() implemented\n- [ ] Returns Date on successful parse\n- [ ] Panics with clear message on error\n- [ ] Godoc clearly warns about panic behavior\n- [ ] Godoc recommends Parse() for production\n- [ ] Example test showing test fixture usage\n- [ ] Unit tests verifying panic on invalid input","status":"open","priority":3,"issue_type":"feature","owner":"mail@oliverjakoubek.de","created_at":"2026-02-11T16:21:46.007442996+01:00","created_by":"Oliver Jakoubek","updated_at":"2026-02-11T16:21:46.007442996+01:00","dependencies":[{"issue_id":"quando-7m5","depends_on_id":"quando-gr5","type":"blocks","created_at":"2026-02-11T16:23:11.340600075+01:00","created_by":"Oliver Jakoubek"}]}
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{"id":"quando-91w","title":"Project setup and structure","description":"Set up initial project structure, module, and tooling.\n\n**Repository Structure:**\n```\nquando/\n├── quando.go # Package-level functions\n├── date.go # Date type and core methods\n├── arithmetic.go # Add, Sub\n├── snap.go # StartOf, EndOf, Next, Prev\n├── diff.go # Duration type, Diff\n├── inspect.go # WeekNumber, Quarter, etc.\n├── format.go # Formatting\n├── parse.go # Parsing\n├── clock.go # Clock abstraction\n├── i18n.go # Internationalization\n├── errors.go # Error types\n├── internal/calc/ # Internal helpers\n├── *_test.go # Unit tests\n├── example_test.go # Godoc examples\n├── bench_test.go # Benchmarks\n├── go.mod\n├── go.sum\n├── README.md\n├── LICENSE # MIT\n└── .github/workflows/ci.yml\n```\n\n**Go Module:**\n- Module path: code.beautifulmachines.dev/quando\n- Go version: 1.22+\n- Zero dependencies (stdlib only)\n\n**Tooling:**\n- go fmt\n- go vet\n- golangci-lint (optional)\n\n## Acceptance Criteria\n- [ ] go.mod initialized with correct module path\n- [ ] Go 1.22+ specified in go.mod\n- [ ] Directory structure created\n- [ ] README.md with project overview\n- [ ] LICENSE file (MIT)\n- [ ] .gitignore for Go projects\n- [ ] Basic CI/CD workflow (if applicable)","status":"closed","priority":0,"issue_type":"task","owner":"mail@oliverjakoubek.de","created_at":"2026-02-11T16:22:30.054241058+01:00","created_by":"Oliver Jakoubek","updated_at":"2026-02-11T16:28:17.730717812+01:00","closed_at":"2026-02-11T16:28:17.730717812+01:00","close_reason":"Closed","comments":[{"id":1,"issue_id":"quando-91w","author":"Oliver Jakoubek","text":"Plan: 1) Initialize go.mod with module path code.beautifulmachines.dev/quando and Go 1.22+, 2) Create internal/calc/ directory structure, 3) Write comprehensive README.md, 4) Add MIT LICENSE, 5) Populate .gitignore for Go, 6) Create GitHub Actions CI workflow for testing and linting","created_at":"2026-02-11T15:26:35Z"}]}
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{"id":"quando-95w","title":"Custom layout formatting","description":"Implement FormatLayout() for custom format layouts using Go's standard layout format.\n\n**API:**\n```go\nfunc (d Date) FormatLayout(layout string) string\n```\n\n**Behavior:**\n- Uses Go's reference date format (Mon Jan 2 15:04:05 MST 2006)\n- Respects Lang() setting for month/weekday names\n- Delegates to time.Format() with translations applied\n\n**Examples:**\n```go\n// English (default)\ndate.FormatLayout(\"Monday, 2. January 2006\")\n// → \"Monday, 9. February 2026\"\n\n// German\ndate.Lang(LangDE).FormatLayout(\"Monday, 2. January 2006\")\n// → \"Montag, 9. Februar 2026\"\n```\n\n**Implementation:**\n- Replace month/weekday names based on Lang setting\n- Handle both full and abbreviated names\n- Preserve all other layout characters\n\n## Acceptance Criteria\n- [ ] FormatLayout() implemented\n- [ ] Uses Go's standard layout format\n- [ ] Default (EN) outputs English month/weekday names\n- [ ] DE lang outputs German month/weekday names\n- [ ] Full names translated (Monday, January)\n- [ ] Abbreviated names translated (Mon, Jan)\n- [ ] Non-date characters preserved in layout\n- [ ] Unit tests for various layouts\n- [ ] Unit tests for both EN and DE\n- [ ] Benchmark meets \u003c10µs target with i18n\n- [ ] Godoc with Go layout format reference\n- [ ] Example tests showing custom layouts","status":"open","priority":2,"issue_type":"feature","owner":"mail@oliverjakoubek.de","created_at":"2026-02-11T16:21:59.18488929+01:00","created_by":"Oliver Jakoubek","updated_at":"2026-02-11T16:21:59.18488929+01:00","dependencies":[{"issue_id":"quando-95w","depends_on_id":"quando-j2s","type":"blocks","created_at":"2026-02-11T16:23:12.24298936+01:00","created_by":"Oliver Jakoubek"},{"issue_id":"quando-95w","depends_on_id":"quando-zbr","type":"blocks","created_at":"2026-02-11T16:23:12.275497777+01:00","created_by":"Oliver Jakoubek"}]}
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{"id":"quando-95w","title":"Custom layout formatting","description":"Implement FormatLayout() for custom format layouts using Go's standard layout format.\n\n**API:**\n```go\nfunc (d Date) FormatLayout(layout string) string\n```\n\n**Behavior:**\n- Uses Go's reference date format (Mon Jan 2 15:04:05 MST 2006)\n- Respects Lang() setting for month/weekday names\n- Delegates to time.Format() with translations applied\n\n**Examples:**\n```go\n// English (default)\ndate.FormatLayout(\"Monday, 2. January 2006\")\n// → \"Monday, 9. February 2026\"\n\n// German\ndate.Lang(LangDE).FormatLayout(\"Monday, 2. January 2006\")\n// → \"Montag, 9. Februar 2026\"\n```\n\n**Implementation:**\n- Replace month/weekday names based on Lang setting\n- Handle both full and abbreviated names\n- Preserve all other layout characters\n\n## Acceptance Criteria\n- [ ] FormatLayout() implemented\n- [ ] Uses Go's standard layout format\n- [ ] Default (EN) outputs English month/weekday names\n- [ ] DE lang outputs German month/weekday names\n- [ ] Full names translated (Monday, January)\n- [ ] Abbreviated names translated (Mon, Jan)\n- [ ] Non-date characters preserved in layout\n- [ ] Unit tests for various layouts\n- [ ] Unit tests for both EN and DE\n- [ ] Benchmark meets \u003c10µs target with i18n\n- [ ] Godoc with Go layout format reference\n- [ ] Example tests showing custom layouts","status":"closed","priority":2,"issue_type":"feature","owner":"mail@oliverjakoubek.de","created_at":"2026-02-11T16:21:59.18488929+01:00","created_by":"Oliver Jakoubek","updated_at":"2026-02-11T20:34:48.639373428+01:00","closed_at":"2026-02-11T20:34:48.639373428+01:00","close_reason":"Closed","dependencies":[{"issue_id":"quando-95w","depends_on_id":"quando-j2s","type":"blocks","created_at":"2026-02-11T16:23:12.24298936+01:00","created_by":"Oliver Jakoubek"},{"issue_id":"quando-95w","depends_on_id":"quando-zbr","type":"blocks","created_at":"2026-02-11T16:23:12.275497777+01:00","created_by":"Oliver Jakoubek"}]}
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{"id":"quando-9sf","title":"Snap operations: Next and Prev weekday","description":"Implement Next and Prev methods to jump to next/previous occurrence of a weekday.\n\n**API:**\n```go\nfunc (d Date) Next(weekday time.Weekday) Date\nfunc (d Date) Prev(weekday time.Weekday) Date\n```\n\n**Critical Behavior:**\n- **Next(Monday)**: Always NEXT Monday, never today (even if today is Monday)\n- **Prev(Friday)**: Always PREVIOUS Friday, never today (even if today is Friday)\n- Preserves time of day from source date\n\n**Examples:**\n- Monday calling Next(Monday) → next Monday (7 days later)\n- Monday calling Prev(Monday) → previous Monday (7 days earlier)\n- Tuesday calling Next(Monday) → next Monday (6 days later)\n\n## Acceptance Criteria\n- [ ] Next() implemented for all weekdays\n- [ ] Prev() implemented for all weekdays\n- [ ] Next() never returns today (always future)\n- [ ] Prev() never returns today (always past)\n- [ ] Time of day preserved from source\n- [ ] Edge case: Same weekday correctly skips to next/prev week\n- [ ] Unit tests for all weekday combinations\n- [ ] Tests for same weekday edge case\n- [ ] Benchmarks meet \u003c1µs target\n- [ ] Godoc comments with same-weekday behavior example","status":"closed","priority":1,"issue_type":"feature","owner":"mail@oliverjakoubek.de","created_at":"2026-02-11T16:20:58.320692116+01:00","created_by":"Oliver Jakoubek","updated_at":"2026-02-11T17:33:58.411235677+01:00","closed_at":"2026-02-11T17:33:58.411235677+01:00","close_reason":"Closed","dependencies":[{"issue_id":"quando-9sf","depends_on_id":"quando-j2s","type":"blocks","created_at":"2026-02-11T16:23:07.357069002+01:00","created_by":"Oliver Jakoubek"}],"comments":[{"id":6,"issue_id":"quando-9sf","author":"Oliver Jakoubek","text":"Plan: 1) Add Next(weekday) and Prev(weekday) methods to snap.go, 2) Implement logic to ALWAYS skip to next/prev occurrence (never return today), 3) Preserve time of day from source date, 4) Handle same-weekday edge case (Monday.Next(Monday) = next Monday), 5) Write comprehensive unit tests for all weekday combinations, 6) Add tests specifically for same-weekday edge case, 7) Add benchmarks, 8) Ensure godoc comments with examples","created_at":"2026-02-11T16:31:43Z"}]}
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{"id":"quando-b4r","title":"Arithmetic operations: Add and Sub","description":"Implement Add and Sub methods for all time units with special month-end overflow handling.\n\n**API:**\n```go\nfunc (d Date) Add(value int, unit Unit) Date\nfunc (d Date) Sub(value int, unit Unit) Date\n```\n\n**Critical Requirements:**\n- Support all 8 units (Seconds, Minutes, Hours, Days, Weeks, Months, Quarters, Years)\n- **Month-end overflow**: When adding months, if target day doesn't exist, snap to month end\n - 2026-01-31 + 1 month = 2026-02-28 (February end)\n - 2026-01-24 + 1 month = 2026-02-24 (regular)\n - 2026-05-31 + 1 month = 2026-06-30 (June has 30 days)\n- DST handling: Add(1, Days) = same time next calendar day, NOT 24 hours\n- Support method chaining (fluent API)\n- Immutability: return new Date, never modify receiver\n\n## Acceptance Criteria\n- [ ] Add() implemented for all 8 units\n- [ ] Sub() implemented for all 8 units\n- [ ] Month-end overflow logic correct for all month combinations\n- [ ] Leap year handling (Feb 29 edge cases)\n- [ ] DST handling tested across DST transitions\n- [ ] Negative values supported (Add(-1) == Sub(1))\n- [ ] Method chaining works (Add().Sub().Add())\n- [ ] Unit tests with 95%+ coverage\n- [ ] Table-driven tests for month-end edge cases\n- [ ] Benchmarks meet \u003c1µs target\n- [ ] Godoc comments with month-end examples","status":"closed","priority":1,"issue_type":"feature","owner":"mail@oliverjakoubek.de","created_at":"2026-02-11T16:20:45.138685425+01:00","created_by":"Oliver Jakoubek","updated_at":"2026-02-11T17:43:08.625784593+01:00","closed_at":"2026-02-11T17:43:08.625784593+01:00","close_reason":"Closed","dependencies":[{"issue_id":"quando-b4r","depends_on_id":"quando-j2s","type":"blocks","created_at":"2026-02-11T16:23:06.383654729+01:00","created_by":"Oliver Jakoubek"},{"issue_id":"quando-b4r","depends_on_id":"quando-4bh","type":"blocks","created_at":"2026-02-11T16:23:06.424777459+01:00","created_by":"Oliver Jakoubek"},{"issue_id":"quando-b4r","depends_on_id":"quando-36t","type":"blocks","created_at":"2026-02-11T16:23:06.471629282+01:00","created_by":"Oliver Jakoubek"}],"comments":[{"id":9,"issue_id":"quando-b4r","author":"Oliver Jakoubek","text":"Plan: 1) Create arithmetic.go with Add() and Sub() methods, 2) Implement unit handling for all 8 units (Seconds through Years), 3) Implement month-end overflow logic: when adding months, if target day doesn't exist, snap to last day of month, 4) Handle leap years correctly (Feb 29 edge cases), 5) Use time.Time methods for Seconds/Minutes/Hours/Days for DST-safe calendar day arithmetic, 6) Sub() as wrapper calling Add() with negative value, 7) Comprehensive table-driven tests for month-end overflow edge cases, 8) DST transition tests, 9) Negative value tests, 10) Method chaining tests, 11) Benchmarks, 12) Godoc with month-end examples","created_at":"2026-02-11T16:40:29Z"}]}
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{"id":"quando-dsx","title":"Snap operations: StartOf and EndOf","description":"Implement StartOf and EndOf methods to jump to beginning/end of time units.\n\n**API:**\n```go\nfunc (d Date) StartOf(unit Unit) Date\nfunc (d Date) EndOf(unit Unit) Date\n```\n\n**Supported Units:** Week, Month, Quarter, Year\n\n**Behavior:**\n- **StartOf(Week)**: Monday 00:00:00 (ISO 8601 default)\n- **EndOf(Week)**: Sunday 23:59:59\n- **StartOf(Month)**: 1st day of month, 00:00:00\n- **EndOf(Month)**: Last day of month, 23:59:59\n- **StartOf(Quarter)**: Q1=Jan 1, Q2=Apr 1, Q3=Jul 1, Q4=Oct 1\n- **EndOf(Quarter)**: Q1=Mar 31, Q2=Jun 30, Q3=Sep 30, Q4=Dec 31\n- **StartOf(Year)**: Jan 1, 00:00:00\n- **EndOf(Year)**: Dec 31, 23:59:59\n\n**Quarter Definition:**\n- Q1 = January–March\n- Q2 = April–June\n- Q3 = July–September\n- Q4 = October–Dezember\n\n## Acceptance Criteria\n- [ ] StartOf(Week) returns Monday 00:00:00\n- [ ] EndOf(Week) returns Sunday 23:59:59\n- [ ] StartOf(Month) returns 1st day 00:00:00\n- [ ] EndOf(Month) handles all month lengths correctly\n- [ ] StartOf(Quarter) returns correct quarter start\n- [ ] EndOf(Quarter) returns correct quarter end (handles 30/31 day months)\n- [ ] StartOf(Year) returns Jan 1 00:00:00\n- [ ] EndOf(Year) returns Dec 31 23:59:59\n- [ ] Leap year handling for February\n- [ ] Unit tests for all units and edge cases\n- [ ] ISO 8601 week compliance tests\n- [ ] Benchmarks meet \u003c1µs target\n- [ ] Godoc comments with examples","status":"closed","priority":1,"issue_type":"feature","owner":"mail@oliverjakoubek.de","created_at":"2026-02-11T16:20:52.371452631+01:00","created_by":"Oliver Jakoubek","updated_at":"2026-02-11T16:39:08.822973772+01:00","closed_at":"2026-02-11T16:39:08.822973772+01:00","close_reason":"Closed","dependencies":[{"issue_id":"quando-dsx","depends_on_id":"quando-j2s","type":"blocks","created_at":"2026-02-11T16:23:07.280217562+01:00","created_by":"Oliver Jakoubek"},{"issue_id":"quando-dsx","depends_on_id":"quando-4bh","type":"blocks","created_at":"2026-02-11T16:23:07.316281123+01:00","created_by":"Oliver Jakoubek"}],"comments":[{"id":5,"issue_id":"quando-dsx","author":"Oliver Jakoubek","text":"Plan: 1) Create snap.go with StartOf() and EndOf() methods, 2) Implement Week snapping (Monday start, Sunday end per ISO 8601), 3) Implement Month snapping (handle all month lengths), 4) Implement Quarter snapping (Q1=Jan-Mar, Q2=Apr-Jun, Q3=Jul-Sep, Q4=Oct-Dec), 5) Implement Year snapping, 6) Add comprehensive unit tests (all units, edge cases, leap years, month-end variations), 7) Add benchmarks to meet \u003c1µs target, 8) Add godoc comments and example tests","created_at":"2026-02-11T15:35:05Z"}]}
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@ -703,3 +703,74 @@ func ExampleDate_Format_languageIndependence() {
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// ISO (DE): 2026-02-09
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// Same: true
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}
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// ExampleDate_FormatLayout demonstrates custom layout formatting
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func ExampleDate_FormatLayout() {
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date := quando.From(time.Date(2026, 2, 9, 14, 30, 0, 0, time.UTC))
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// Common layouts
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fmt.Println(date.FormatLayout("Monday, January 2, 2006"))
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fmt.Println(date.FormatLayout("Mon, Jan 2, 2006"))
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fmt.Println(date.FormatLayout("January 2, 2006"))
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fmt.Println(date.FormatLayout("02 Jan 2006"))
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// Output:
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// Monday, February 9, 2026
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// Mon, Feb 9, 2026
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// February 9, 2026
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// 09 Feb 2026
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}
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// ExampleDate_FormatLayout_german demonstrates German localization with custom layouts
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func ExampleDate_FormatLayout_german() {
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date := quando.From(time.Date(2026, 2, 9, 14, 30, 0, 0, time.UTC)).WithLang(quando.DE)
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// German formats
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fmt.Println(date.FormatLayout("Monday, 2. January 2006"))
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fmt.Println(date.FormatLayout("Mon, 02. Jan 2006"))
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fmt.Println(date.FormatLayout("2. January 2006"))
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// Output:
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// Montag, 9. Februar 2026
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// Mo, 09. Feb 2026
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// 9. Februar 2026
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}
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// ExampleDate_FormatLayout_custom demonstrates custom layouts with time components
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func ExampleDate_FormatLayout_custom() {
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date := quando.From(time.Date(2026, 2, 9, 14, 30, 45, 0, time.UTC))
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// With time
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fmt.Println(date.FormatLayout("Monday, January 2, 2006 at 15:04"))
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fmt.Println(date.FormatLayout("Mon Jan 2 15:04:05 2006"))
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fmt.Println(date.FormatLayout("2006-01-02 15:04:05"))
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// German with time
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dateDE := date.WithLang(quando.DE)
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fmt.Println(dateDE.FormatLayout("Monday, 2. January 2006 um 15:04 Uhr"))
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// Output:
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// Monday, February 9, 2026 at 14:30
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// Mon Feb 9 14:30:45 2026
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// 2026-02-09 14:30:45
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// Montag, 9. Februar 2026 um 14:30 Uhr
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}
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// ExampleDate_FormatLayout_comparison demonstrates comparing preset Format vs custom FormatLayout
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func ExampleDate_FormatLayout_comparison() {
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date := quando.From(time.Date(2026, 2, 9, 0, 0, 0, 0, time.UTC))
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// Preset formats
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fmt.Println("Format(Long):", date.Format(quando.Long))
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fmt.Println("Format(ISO):", date.Format(quando.ISO))
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// Custom layouts (equivalent)
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fmt.Println("FormatLayout(custom):", date.FormatLayout("January 2, 2006"))
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fmt.Println("FormatLayout(ISO):", date.FormatLayout("2006-01-02"))
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// Custom layout flexibility
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fmt.Println("FormatLayout(custom style):", date.FormatLayout("Mon, Jan 2"))
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// Output:
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// Format(Long): February 9, 2026
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// Format(ISO): 2026-02-09
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// FormatLayout(custom): February 9, 2026
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// FormatLayout(ISO): 2026-02-09
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// FormatLayout(custom style): Mon, Feb 9
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}
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87
format.go
87
format.go
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@ -2,6 +2,7 @@ package quando
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import (
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"fmt"
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"strings"
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"time"
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)
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@ -132,6 +133,92 @@ func (d Date) formatLong() string {
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}
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}
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// FormatLayout formats the date using a custom layout string with localized month/weekday names.
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//
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// The layout parameter uses Go's standard time layout format (Mon Jan 2 15:04:05 MST 2006).
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// Month and weekday names in the output are translated according to the Date's Lang setting.
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//
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// Supported layout components (see time.Format documentation for full details):
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// - "January" - Full month name (localized)
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// - "Jan" - Short month name (localized)
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// - "Monday" - Full weekday name (localized)
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// - "Mon" - Short weekday name (localized)
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// - All numeric components (year, day, hour, etc.) - not localized
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//
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// Language Support:
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// - EN (English) - Default, no translation
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// - DE (German) - Translates month/weekday names
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//
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// Performance: < 10 µs for typical layouts with i18n
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//
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// Example:
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//
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// date := quando.From(time.Date(2026, 2, 9, 14, 30, 0, 0, time.UTC))
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//
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// // English (default)
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// date.FormatLayout("Monday, 2. January 2006") // "Monday, 9. February 2026"
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//
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// // German
|
||||
// date.WithLang(quando.DE).FormatLayout("Monday, 2. January 2006") // "Montag, 9. Februar 2026"
|
||||
// date.WithLang(quando.DE).FormatLayout("Mon, 02 Jan 2006") // "Mo, 09 Feb 2026"
|
||||
func (d Date) FormatLayout(layout string) string {
|
||||
// Fast path: if lang is EN (or not set), just use Go's format directly
|
||||
lang := d.lang
|
||||
if lang == "" || lang == EN {
|
||||
return d.t.Format(layout)
|
||||
}
|
||||
|
||||
// Format using Go's time.Format (always in English)
|
||||
formatted := d.t.Format(layout)
|
||||
|
||||
// Build replacement pairs: old (English) -> new (localized)
|
||||
// Order matters: longest strings first to avoid partial matches
|
||||
// We use strings.Replacer which processes all replacements in a single pass
|
||||
var replacementPairs []string
|
||||
|
||||
// 1. Full month names first (e.g., "September" before "Sep")
|
||||
for m := time.January; m <= time.December; m++ {
|
||||
enFull := monthNames[EN][m-1]
|
||||
localFull := lang.MonthName(m)
|
||||
if enFull != localFull {
|
||||
replacementPairs = append(replacementPairs, enFull, localFull)
|
||||
}
|
||||
}
|
||||
|
||||
// 2. Full weekday names (e.g., "Wednesday" before "Wed")
|
||||
for wd := time.Sunday; wd <= time.Saturday; wd++ {
|
||||
enFull := weekdayNames[EN][wd]
|
||||
localFull := lang.WeekdayName(wd)
|
||||
if enFull != localFull {
|
||||
replacementPairs = append(replacementPairs, enFull, localFull)
|
||||
}
|
||||
}
|
||||
|
||||
// 3. Short month names
|
||||
for m := time.January; m <= time.December; m++ {
|
||||
enShort := monthNamesShort[EN][m-1]
|
||||
localShort := lang.MonthNameShort(m)
|
||||
if enShort != localShort {
|
||||
replacementPairs = append(replacementPairs, enShort, localShort)
|
||||
}
|
||||
}
|
||||
|
||||
// 4. Short weekday names
|
||||
for wd := time.Sunday; wd <= time.Saturday; wd++ {
|
||||
enShort := weekdayNamesShort[EN][wd]
|
||||
localShort := lang.WeekdayNameShort(wd)
|
||||
if enShort != localShort {
|
||||
replacementPairs = append(replacementPairs, enShort, localShort)
|
||||
}
|
||||
}
|
||||
|
||||
// Create a replacer and apply all replacements in a single pass
|
||||
// This ensures that once a full name is replaced, the short name in the
|
||||
// replacement won't be affected (e.g., "Monday" -> "Montag", and "Mon" in "Montag" won't become "Mo")
|
||||
replacer := strings.NewReplacer(replacementPairs...)
|
||||
return replacer.Replace(formatted)
|
||||
}
|
||||
|
||||
// String returns the string representation of the Format type.
|
||||
// This is used for better test output and debugging.
|
||||
func (f Format) String() string {
|
||||
|
|
|
|||
254
format_test.go
254
format_test.go
|
|
@ -277,3 +277,257 @@ func BenchmarkFormat_RFC2822(b *testing.B) {
|
|||
_ = date.Format(RFC2822)
|
||||
}
|
||||
}
|
||||
|
||||
// TestFormatLayout tests basic FormatLayout functionality
|
||||
func TestFormatLayout(t *testing.T) {
|
||||
date := From(time.Date(2026, 2, 9, 14, 30, 45, 0, time.UTC))
|
||||
|
||||
tests := []struct {
|
||||
name string
|
||||
lang Lang
|
||||
layout string
|
||||
expected string
|
||||
}{
|
||||
// English (default)
|
||||
{
|
||||
name: "EN: Full month and weekday",
|
||||
lang: EN,
|
||||
layout: "Monday, 2. January 2006",
|
||||
expected: "Monday, 9. February 2026",
|
||||
},
|
||||
{
|
||||
name: "EN: Short month and weekday",
|
||||
lang: EN,
|
||||
layout: "Mon, 02 Jan 2006",
|
||||
expected: "Mon, 09 Feb 2026",
|
||||
},
|
||||
{
|
||||
name: "EN: With time",
|
||||
lang: EN,
|
||||
layout: "Monday, January 2, 2006 at 15:04",
|
||||
expected: "Monday, February 9, 2026 at 14:30",
|
||||
},
|
||||
|
||||
// German
|
||||
{
|
||||
name: "DE: Full month and weekday",
|
||||
lang: DE,
|
||||
layout: "Monday, 2. January 2006",
|
||||
expected: "Montag, 9. Februar 2026",
|
||||
},
|
||||
{
|
||||
name: "DE: Short month and weekday",
|
||||
lang: DE,
|
||||
layout: "Mon, 02 Jan 2006",
|
||||
expected: "Mo, 09 Feb 2026",
|
||||
},
|
||||
{
|
||||
name: "DE: With time",
|
||||
lang: DE,
|
||||
layout: "Monday, 2. January 2006 um 15:04 Uhr",
|
||||
expected: "Montag, 9. Februar 2026 um 14:30 Uhr",
|
||||
},
|
||||
|
||||
// Empty lang defaults to EN
|
||||
{
|
||||
name: "Empty lang defaults to EN",
|
||||
lang: "",
|
||||
layout: "Monday, January 2, 2006",
|
||||
expected: "Monday, February 9, 2026",
|
||||
},
|
||||
|
||||
// Numeric only (language-independent)
|
||||
{
|
||||
name: "Numeric only layout",
|
||||
lang: DE,
|
||||
layout: "2006-01-02 15:04:05",
|
||||
expected: "2026-02-09 14:30:45",
|
||||
},
|
||||
}
|
||||
|
||||
for _, tt := range tests {
|
||||
t.Run(tt.name, func(t *testing.T) {
|
||||
testDate := date
|
||||
if tt.lang != "" {
|
||||
testDate = date.WithLang(tt.lang)
|
||||
}
|
||||
result := testDate.FormatLayout(tt.layout)
|
||||
if result != tt.expected {
|
||||
t.Errorf("FormatLayout(%q) with lang=%v = %q, want %q", tt.layout, tt.lang, result, tt.expected)
|
||||
}
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
// TestFormatLayout_EdgeCases tests edge cases including all months, all weekdays, and substring collisions
|
||||
func TestFormatLayout_EdgeCases(t *testing.T) {
|
||||
// Test all 12 months - full names
|
||||
t.Run("All months full names DE", func(t *testing.T) {
|
||||
for m := time.January; m <= time.December; m++ {
|
||||
date := From(time.Date(2026, m, 15, 0, 0, 0, 0, time.UTC)).WithLang(DE)
|
||||
result := date.FormatLayout("January 2006")
|
||||
expectedMonth := DE.MonthName(m)
|
||||
expected := expectedMonth + " 2026"
|
||||
if result != expected {
|
||||
t.Errorf("Month %d: FormatLayout = %q, want %q", m, result, expected)
|
||||
}
|
||||
}
|
||||
})
|
||||
|
||||
// Test all 12 months - short names
|
||||
t.Run("All months short names DE", func(t *testing.T) {
|
||||
for m := time.January; m <= time.December; m++ {
|
||||
date := From(time.Date(2026, m, 15, 0, 0, 0, 0, time.UTC)).WithLang(DE)
|
||||
result := date.FormatLayout("Jan 2006")
|
||||
expectedMonth := DE.MonthNameShort(m)
|
||||
expected := expectedMonth + " 2026"
|
||||
if result != expected {
|
||||
t.Errorf("Month %d: FormatLayout = %q, want %q", m, result, expected)
|
||||
}
|
||||
}
|
||||
})
|
||||
|
||||
// Test all 7 weekdays - full names
|
||||
t.Run("All weekdays full names DE", func(t *testing.T) {
|
||||
// Start with Monday, Feb 9, 2026
|
||||
for i := 0; i < 7; i++ {
|
||||
date := From(time.Date(2026, 2, 9+i, 0, 0, 0, 0, time.UTC)).WithLang(DE)
|
||||
weekday := date.Time().Weekday()
|
||||
result := date.FormatLayout("Monday")
|
||||
expected := DE.WeekdayName(weekday)
|
||||
if result != expected {
|
||||
t.Errorf("Weekday %v: FormatLayout = %q, want %q", weekday, result, expected)
|
||||
}
|
||||
}
|
||||
})
|
||||
|
||||
// Test all 7 weekdays - short names
|
||||
t.Run("All weekdays short names DE", func(t *testing.T) {
|
||||
// Start with Monday, Feb 9, 2026
|
||||
for i := 0; i < 7; i++ {
|
||||
date := From(time.Date(2026, 2, 9+i, 0, 0, 0, 0, time.UTC)).WithLang(DE)
|
||||
weekday := date.Time().Weekday()
|
||||
result := date.FormatLayout("Mon")
|
||||
expected := DE.WeekdayNameShort(weekday)
|
||||
if result != expected {
|
||||
t.Errorf("Weekday %v: FormatLayout = %q, want %q", weekday, result, expected)
|
||||
}
|
||||
}
|
||||
})
|
||||
|
||||
// Test substring collision: "March" vs "Mar"
|
||||
t.Run("Substring collision March/Mar", func(t *testing.T) {
|
||||
date := From(time.Date(2026, 3, 15, 0, 0, 0, 0, time.UTC)).WithLang(DE)
|
||||
// Layout contains both full and short month name
|
||||
result := date.FormatLayout("March and Mar")
|
||||
expected := "März and Mär"
|
||||
if result != expected {
|
||||
t.Errorf("Substring collision: FormatLayout = %q, want %q", result, expected)
|
||||
}
|
||||
})
|
||||
|
||||
// Test complex layout with multiple components
|
||||
t.Run("Complex layout with multiple components", func(t *testing.T) {
|
||||
date := From(time.Date(2026, 12, 25, 15, 30, 45, 0, time.UTC)).WithLang(DE)
|
||||
result := date.FormatLayout("Monday, January 2, 2006 at 15:04:05 (Mon, Jan)")
|
||||
expected := "Freitag, Dezember 25, 2026 at 15:30:45 (Fr, Dez)" // Dec 25, 2026 is Friday
|
||||
if result != expected {
|
||||
t.Errorf("Complex layout: FormatLayout = %q, want %q", result, expected)
|
||||
}
|
||||
})
|
||||
|
||||
// Test leap year edge case
|
||||
t.Run("Leap year Feb 29", func(t *testing.T) {
|
||||
date := From(time.Date(2024, 2, 29, 0, 0, 0, 0, time.UTC)).WithLang(DE)
|
||||
result := date.FormatLayout("Monday, January 2, 2006")
|
||||
expected := "Donnerstag, Februar 29, 2024"
|
||||
if result != expected {
|
||||
t.Errorf("Leap year: FormatLayout = %q, want %q", result, expected)
|
||||
}
|
||||
})
|
||||
}
|
||||
|
||||
// TestFormatLayout_NumericFormatsLanguageIndependent verifies numeric layouts are language-independent
|
||||
func TestFormatLayout_NumericFormatsLanguageIndependent(t *testing.T) {
|
||||
date := From(time.Date(2026, 2, 9, 14, 30, 45, 0, time.UTC))
|
||||
|
||||
numericLayouts := []string{
|
||||
"2006-01-02",
|
||||
"02.01.2006",
|
||||
"01/02/2006",
|
||||
"2006-01-02 15:04:05",
|
||||
"15:04:05",
|
||||
"2006",
|
||||
"01",
|
||||
"02",
|
||||
}
|
||||
|
||||
for _, layout := range numericLayouts {
|
||||
t.Run(layout, func(t *testing.T) {
|
||||
resultEN := date.WithLang(EN).FormatLayout(layout)
|
||||
resultDE := date.WithLang(DE).FormatLayout(layout)
|
||||
|
||||
if resultEN != resultDE {
|
||||
t.Errorf("Numeric layout %q should be language-independent: EN=%q, DE=%q", layout, resultEN, resultDE)
|
||||
}
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
// TestFormatLayout_Immutability verifies FormatLayout doesn't modify the original Date
|
||||
func TestFormatLayout_Immutability(t *testing.T) {
|
||||
original := From(time.Date(2026, 2, 9, 14, 30, 45, 0, time.UTC)).WithLang(DE)
|
||||
|
||||
// Call FormatLayout multiple times
|
||||
_ = original.FormatLayout("Monday, January 2, 2006")
|
||||
_ = original.FormatLayout("Mon, 02 Jan 2006")
|
||||
_ = original.FormatLayout("2006-01-02")
|
||||
|
||||
// Verify original is unchanged
|
||||
expected := time.Date(2026, 2, 9, 14, 30, 45, 0, time.UTC)
|
||||
if !original.Time().Equal(expected) {
|
||||
t.Errorf("FormatLayout modified the original date: got %v, want %v", original.Time(), expected)
|
||||
}
|
||||
|
||||
// Verify lang is unchanged
|
||||
if original.lang != DE {
|
||||
t.Errorf("FormatLayout modified the lang: got %v, want %v", original.lang, DE)
|
||||
}
|
||||
}
|
||||
|
||||
// Benchmarks for FormatLayout
|
||||
func BenchmarkFormatLayout_EN_Simple(b *testing.B) {
|
||||
date := From(time.Date(2026, 2, 9, 14, 30, 45, 0, time.UTC)).WithLang(EN)
|
||||
layout := "Monday, January 2, 2006"
|
||||
b.ResetTimer()
|
||||
for i := 0; i < b.N; i++ {
|
||||
_ = date.FormatLayout(layout)
|
||||
}
|
||||
}
|
||||
|
||||
func BenchmarkFormatLayout_EN_Numeric(b *testing.B) {
|
||||
date := From(time.Date(2026, 2, 9, 14, 30, 45, 0, time.UTC)).WithLang(EN)
|
||||
layout := "2006-01-02 15:04:05"
|
||||
b.ResetTimer()
|
||||
for i := 0; i < b.N; i++ {
|
||||
_ = date.FormatLayout(layout)
|
||||
}
|
||||
}
|
||||
|
||||
func BenchmarkFormatLayout_DE_Simple(b *testing.B) {
|
||||
date := From(time.Date(2026, 2, 9, 14, 30, 45, 0, time.UTC)).WithLang(DE)
|
||||
layout := "Monday, January 2, 2006"
|
||||
b.ResetTimer()
|
||||
for i := 0; i < b.N; i++ {
|
||||
_ = date.FormatLayout(layout)
|
||||
}
|
||||
}
|
||||
|
||||
func BenchmarkFormatLayout_DE_Complex(b *testing.B) {
|
||||
date := From(time.Date(2026, 2, 9, 14, 30, 45, 0, time.UTC)).WithLang(DE)
|
||||
layout := "Monday, January 2, 2006 at 15:04:05 MST (Mon, Jan)"
|
||||
b.ResetTimer()
|
||||
for i := 0; i < b.N; i++ {
|
||||
_ = date.FormatLayout(layout)
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue