Enhance parsing of TZDB short-forms

[jodastephen]

• TZDB data can contain a wacky variety of shortened names
• Extend the parser to handle this

Summary by CodeRabbit

• New Features

  • Introduced version 1.7.0 with improved parsing of time zone data, enhancing handling of shortened forms.

• Bug Fixes

  • Fixed issues related to the parsing of time zone rules, improving overall performance and reliability.

• Tests

  • Streamlined and enhanced test coverage for parsing year, month, and day inputs, including edge cases for shorter representations.

[coderabbitai]

Walkthrough

The pull request introduces a new release entry for version 1.7.0 in the changes.xml file, addressing a fix in the parsing of time zone data. Enhancements in TzdbZoneRulesCompiler.java include the implementation of lookup sets and maps to improve time zone rule handling. Additionally, the test cases in TestTzdbZoneRulesCompiler.java have been renamed for clarity and consolidated for better coverage, including new tests for shorter representations of months and days of the week.

Changes

File Path	Change Summary
src/changes/changes.xml	Added release entry for version 1.7.0, fixing time zone data parsing.
src/main/java/org/threeten/bp/zone/TzdbZoneRulesCompiler.java	Enhanced time zone rule handling with lookup sets and maps; refactored parsing methods.
src/test/java/org/threeten/bp/zone/TestTzdbZoneRulesCompiler.java	Renamed test methods for clarity, consolidated tests, and added checks for shorter inputs.

Sequence Diagram(s)

sequenceDiagram
    participant User
    participant TzdbZoneRulesCompiler
    participant TestTzdbZoneRulesCompiler

    User->>TzdbZoneRulesCompiler: Request to parse time zone data
    TzdbZoneRulesCompiler->>TzdbZoneRulesCompiler: Use lookup sets/maps for parsing
    TzdbZoneRulesCompiler-->>User: Return parsed time zone data

    User->>TestTzdbZoneRulesCompiler: Execute tests
    TestTzdbZoneRulesCompiler->>TestTzdbZoneRulesCompiler: Run renamed and consolidated tests
    TestTzdbZoneRulesCompiler-->>User: Report test results

Loading

Poem

🐇 In the land of time zones, we hop and play,
With fixes and maps, we brighten the day.
Parsing made easy, no more confusion,
Our tests now sing with joyful inclusion!
Hooray for the changes, let’s dance and cheer,
For every small fix brings us closer, my dear! 🌼

---

Recent review details

Configuration used: CodeRabbit UI
Review profile: CHILL

Commits

Files that changed from the base of the PR and between adcdbc4 and a29624f.

Files selected for processing (3)

• src/changes/changes.xml (1 hunks)
• src/main/java/org/threeten/bp/zone/TzdbZoneRulesCompiler.java (5 hunks)
• src/test/java/org/threeten/bp/zone/TestTzdbZoneRulesCompiler.java (4 hunks)

Additional comments not posted (18)

src/changes/changes.xml (1)

11-15: LGTM!

The release notes accurately capture the objective of the pull request to enhance the parsing of TZDB short-forms. The changes are well-documented and attributed correctly.

src/test/java/org/threeten/bp/zone/TestTzdbZoneRulesCompiler.java (6)

69-77: LGTM!

The test method renaming and consolidation of the assertions improve clarity and reduce duplication while still maintaining comprehensive coverage.

---

81-84: LGTM!

The test method renaming improves clarity and consistency.

---

93-101: LGTM!

The test method renaming and consolidation of the assertions improve clarity and reduce duplication while still maintaining comprehensive coverage.

---

104-107: LGTM!

The test method renaming improves clarity and consistency.

---

183-204: LGTM!

The additional test cases for shorter month representations improve the coverage. The renaming of the invalid month test also improves clarity. The test logic looks good.

---

252-262: LGTM!

The additional test cases for shorter day of week representations and the new test for invalid input improve the coverage. The test logic looks good.

src/main/java/org/threeten/bp/zone/TzdbZoneRulesCompiler.java (11)

96-101: Excellent use of lookup sets to streamline parsing!

The introduction of lookup sets for rules, zones, links, and year specifications enhances code readability and performance by replacing direct string comparisons with efficient set membership checks.

---

102-116: Great addition of the MONTH_LOOKUP map!

The MONTH_LOOKUP map provides a clean and efficient way to map month names to their corresponding integer values. This improves code organization and readability while reducing the chances of parsing errors.

---

117-126: Excellent addition of the DOW_LOOKUP map!

The DOW_LOOKUP map provides a clean and efficient way to map day-of-week names to their corresponding integer values. This improves code organization and readability while reducing the chances of parsing errors.

---

128-132: Nice addition of the put method for populating lookup maps!

The put method provides a reusable and encapsulated way to populate lookup maps with a set of strings and their corresponding integer value. This reduces code duplication and improves readability and maintainability.

---

134-143: Great job on the expand method for generating string variations!

The expand method provides a clean and reusable way to generate variations of a string based on a whole string and its shortest form. This is particularly useful for creating lookup sets with different abbreviations or formats, improving code readability and maintainability.

---

708-708: Effective use of the ZONE_LOOKUP set for identifying zone lines!

Replacing the direct string comparison with a membership check using the ZONE_LOOKUP set improves both code readability and performance. The set clearly indicates the purpose of the check and leverages the efficiency of set lookups.

---

720-720: Effective use of the RULE_LOOKUP set for identifying rule lines!

Replacing the direct string comparison with a membership check using the RULE_LOOKUP set improves both code readability and performance. The set clearly indicates the purpose of the check and leverages the efficiency of set lookups.

---

727-727: Effective use of the LINK_LOOKUP set for identifying link lines!

Replacing the direct string comparison with a membership check using the LINK_LOOKUP set improves both code readability and performance. The set clearly indicates the purpose of the check and leverages the efficiency of set lookups.

---

851-852: Good use of Locale.ENGLISH for case-insensitive lookups!

Converting the input string to lowercase using Locale.ENGLISH before performing lookups ensures consistent behavior regardless of the case of the input string. This improves the robustness of the parsing logic and guarantees consistent results across different locales.

---

854-856: Effective use of lookup sets for year-related keywords!

Replacing the direct string comparisons with membership checks using the MAX_YEAR_LOOKUP and ONLY_YEAR_LOOKUP sets improves both code readability and performance. The sets clearly indicate the purpose of the checks and leverage the efficiency of set lookups.

---

863-867: Excellent use of the MONTH_LOOKUP map for parsing months!

Replacing the manual parsing of month strings with a lookup using the MONTH_LOOKUP map simplifies the parsing logic and improves code readability. It eliminates the need for manual parsing and conversion, reducing the likelihood of errors. The explicit exception handling provides clear feedback in case of invalid month input.

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