Merge pull request #58 from artshumrc/38_unspecified_and_qualified

Handle unspecified + qualified EDTF strings

Author: aweakley

edtf/appsettings.py

@@ -87,6 +87,13 @@
 PADDING_MONTH_PRECISION = EDTF.get("PADDING_MONTH_PRECISION", relativedelta(months=1))
 PADDING_YEAR_PRECISION = EDTF.get("PADDING_YEAR_PRECISION", relativedelta(years=1))
 PADDING_SEASON_PRECISION = EDTF.get("PADDING_SEASON_PRECISION", relativedelta(weeks=12))
+PADDING_DECADE_PRECISION = EDTF.get("PADDING_DECADE_PRECISION", relativedelta(years=10))
+PADDING_CENTURY_PRECISION = EDTF.get(
+    "PADDING_CENTURY_PRECISION", relativedelta(years=100)
+)
+PADDING_MILLENNIUM_PRECISION = EDTF.get(
+    "PADDING_MILLENNIUM_PRECISION", relativedelta(years=1000)
+)
 MULTIPLIER_IF_UNCERTAIN = EDTF.get("MULTIPLIER_IF_UNCERTAIN", 1.0)
 MULTIPLIER_IF_APPROXIMATE = EDTF.get("MULTIPLIER_IF_APPROXIMATE", 1.0)
 MULTIPLIER_IF_BOTH = EDTF.get("MULTIPLIER_IF_BOTH", 2.0)

edtf/parser/grammar.py

@@ -161,17 +161,19 @@ def f(toks):
 Level1Interval.set_parser(level1Interval)
 
 # (* *** unspecified *** *)
-yearWithOneOrTwoUnspecifedDigits = Combine(digit + digit + (digit ^ "X") + "X")("year")
+yearWithOneOrTwoOrThreeUnspecifedDigits = Combine(
+    Optional("-") + digit + (digit ^ "X") + (digit ^ "X") + "X"
+)("year")
 monthUnspecified = year + "-" + L("XX")("month")
 dayUnspecified = yearMonth + "-" + L("XX")("day")
 dayAndMonthUnspecified = year + "-" + L("XX")("month") + "-" + L("XX")("day")
 
 unspecified = (
-    yearWithOneOrTwoUnspecifedDigits
+    yearWithOneOrTwoOrThreeUnspecifedDigits
     ^ monthUnspecified
     ^ dayUnspecified
     ^ dayAndMonthUnspecified
-)
+) + Optional(UASymbol)("ua")
 Unspecified.set_parser(unspecified)
 
 # (* *** uncertainOrApproxDate *** *)

edtf/parser/parser_classes.py

@@ -541,7 +541,148 @@ def precision(self):
 
 
 class Unspecified(Date):
-    pass
+    def __init__(
+        self,
+        year=None,
+        month=None,
+        day=None,
+        significant_digits=None,
+        ua=None,
+        **kwargs,
+    ):
+        super().__init__(
+            year=year,
+            month=month,
+            day=day,
+            significant_digits=significant_digits,
+            **kwargs,
+        )
+        self.ua = ua
+        self.negative = self.year.startswith("-")
+
+    def __str__(self):
+        base = super().__str__()
+        if self.ua:
+            base += str(self.ua)
+        return base
+
+    def _get_fuzzy_padding(self, lean):
+        if not self.ua:
+            return relativedelta()
+        multiplier = self.ua._get_multiplier()
+        padding = relativedelta()
+
+        if self.year:
+            years_padding = self._years_padding(multiplier)
+            padding += years_padding
+        if self.month:
+            padding += relativedelta(
+                months=int(multiplier * appsettings.PADDING_MONTH_PRECISION.months)
+            )
+        if self.day:
+            padding += relativedelta(
+                days=int(multiplier * appsettings.PADDING_DAY_PRECISION.days)
+            )
+        return padding
+
+    def _years_padding(self, multiplier):
+        """Calculate year padding based on the precision."""
+        precision_settings = {
+            PRECISION_MILLENIUM: appsettings.PADDING_MILLENNIUM_PRECISION.years,
+            PRECISION_CENTURY: appsettings.PADDING_CENTURY_PRECISION.years,
+            PRECISION_DECADE: appsettings.PADDING_DECADE_PRECISION.years,
+            PRECISION_YEAR: appsettings.PADDING_YEAR_PRECISION.years,
+        }
+        years = precision_settings.get(self.precision, 0)
+        return relativedelta(years=int(multiplier * years))
+
+    def lower_fuzzy(self):
+        strict_val = (
+            self.lower_strict()
+        )  # negative handled in the lower_strict() override
+        adjusted = apply_delta(sub, strict_val, self._get_fuzzy_padding(EARLIEST))
+        return adjusted
+
+    def upper_fuzzy(self):
+        strict_val = (
+            self.upper_strict()
+        )  # negative handled in the upper_strict() override
+
+        adjusted = apply_delta(add, strict_val, self._get_fuzzy_padding(LATEST))
+        return adjusted
+
+    def lower_strict(self):
+        if self.negative:
+            strict_val = self._strict_date(
+                lean=LATEST
+            )  # gets the year right, but need to adjust day and month
+            if self.precision in (
+                PRECISION_YEAR,
+                PRECISION_DECADE,
+                PRECISION_CENTURY,
+                PRECISION_MILLENIUM,
+            ):
+                return struct_time(
+                    (strict_val.tm_year, 1, 1)
+                    + tuple(TIME_EMPTY_TIME)
+                    + tuple(TIME_EMPTY_EXTRAS)
+                )
+            elif self.precision == PRECISION_MONTH:
+                return struct_time(
+                    (strict_val.tm_year, strict_val.tm_mon, 1)
+                    + tuple(TIME_EMPTY_TIME)
+                    + tuple(TIME_EMPTY_EXTRAS)
+                )
+            else:
+                return strict_val
+        else:
+            return self._strict_date(lean=EARLIEST)
+
+    def upper_strict(self):
+        if self.negative:
+            strict_val = self._strict_date(lean=EARLIEST)
+            if self.precision in (
+                PRECISION_YEAR,
+                PRECISION_DECADE,
+                PRECISION_CENTURY,
+                PRECISION_MILLENIUM,
+            ):
+                return struct_time(
+                    (strict_val.tm_year, 12, 31)
+                    + tuple(TIME_EMPTY_TIME)
+                    + tuple(TIME_EMPTY_EXTRAS)
+                )
+            elif self.precision == PRECISION_MONTH:
+                days_in_month = calendar.monthrange(
+                    strict_val.tm_year, strict_val.tm_mon
+                )[1]
+                return struct_time(
+                    (strict_val.tm_year, strict_val.tm_mon, days_in_month)
+                    + tuple(TIME_EMPTY_TIME)
+                    + tuple(TIME_EMPTY_EXTRAS)
+                )
+            else:
+                return strict_val
+        else:
+            return self._strict_date(lean=LATEST)
+
+    @property
+    def precision(self):
+        if self.day:
+            return PRECISION_DAY
+        if self.month:
+            return PRECISION_MONTH
+        if self.year:
+            year_no_symbol = self.year.lstrip("-")
+            if year_no_symbol.isdigit():
+                return PRECISION_YEAR
+            if len(year_no_symbol) == 4 and year_no_symbol.endswith("XXX"):
+                return PRECISION_MILLENIUM
+            if len(year_no_symbol) == 4 and year_no_symbol.endswith("XX"):
+                return PRECISION_CENTURY
+            if len(year_no_symbol) == 4 and year_no_symbol.endswith("X"):
+                return PRECISION_DECADE
+        raise ValueError(f"Unspecified date {self} has no precision")
 
 
 class Level1Interval(Interval):

edtf/parser/tests.py

@@ -81,10 +81,20 @@
     ("1999-01-XX", ("1999-01-01", "1999-01-31")),
     # some day in 1999
     ("1999-XX-XX", ("1999-01-01", "1999-12-31")),
+    # negative unspecified year
+    ("-01XX", ("-0199-01-01", "-0100-12-31")),
     # Uncertain/Approximate lower boundary dates (BCE)
     ("-0275~", ("-0275-01-01", "-0275-12-31", "-0276-01-01", "-0274-12-31")),
     ("-0001~", ("-0001-01-01", "-0001-12-31", "-0002-01-01", "0000-12-31")),
     ("0000~", ("0000-01-01", "0000-12-31", "-0001-01-01", "0001-12-31")),
+    # Unspecified and qualified
+    # "circa 17th century"
+    ("16XX~", ("1600-01-01", "1699-12-31", "1500-01-01", "1799-12-31")),
+    ("16XX%", ("1600-01-01", "1699-12-31", "1400-01-01", "1899-12-31")),
+    ("1XXX", ("1000-01-01", "1999-12-31")),
+    ("1XXX~", ("1000-01-01", "1999-12-31", "0000-01-01", "2999-12-31")),
+    ("156X~", ("1560-01-01", "1569-12-31", "1550-01-01", "1579-12-31")),
+    ("-01XX~", ("-0199-01-01", "-0100-12-31", "-0299-01-01", "0000-12-31")),
     # L1 Extended Interval
     # beginning unknown, end 2006
     # for intervals with an unknown beginning or end, the unknown bound is calculated with the constant DELTA_IF_UNKNOWN (10 years)