[AdrianAtZyte]

Resolves #1254

[codspeed]

Merging this PR will not alter performance

✅ 10 untouched benchmarks

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_{Comparing AdrianAtZyte:quarters (51bd6e5) with master (bd73ab7)}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.04%. Comparing base (bd73ab7) to head (51bd6e5).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1417   +/-   ##
=======================================
  Coverage   99.03%   99.04%           
=======================================
  Files         239      239           
  Lines        3853     3868   +15     
=======================================
+ Hits         3816     3831   +15     
  Misses         37       37           

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[serhii73]

Code review (claude code-review, at bcd52be; the first four items were run on this head). Standalone quarters work and I found no regression for inputs that parsed before. The main follow-up is to anchor the rewrite.

Non-blocking notes:

• The quarter regex only requires no word character on either side, and the substitution runs on the whole string. parse('1 Q2 2025') returns 2025-01-04 (it becomes 1 2025-04), parse('Q2 2025 and 3') returns 2025-04-03, and Q2 1530 is read as the year 1530. All of these returned None on master. Applying the rewrite only when the quarter token is the whole date expression, and limiting the year to a plausible range, would avoid silently wrong dates.
• The rewrite runs before locale selection, so parse('2025Q2', languages=['ru']) still works and every get_date_data call pays an extra substitution; a cheap 'q' in date_string.lower() guard would help.
• "Current" for PREFER_MONTH_OF_YEAR takes now from RELATIVE_BASE or datetime.now() and ignores TIMEZONE, unlike the rest of the parser.
• period='quarter' is only patched onto the final DateData, while _is_valid_date_data and get_intersecting_periods don't know it, and parts still reports ('year','month'). A string with several quarters (2025Q2 2025Q3) returns None.
• Tests cover standalone quarters and three negative cases only. Please add embedded-token cases, search_dates, languages, RETURN_TIME_SPAN and TIMEZONE.