that's too much!

.venv/lib/python3.12/site-packages/fiona/crs.py

@@ -0,0 +1,185 @@
+"""Coordinate reference systems and functions
+
+PROJ is the law of this land: https://proj.org/. But whereas PROJ
+coordinate reference systems are described by strings of parameters such as
+
+    +proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs
+
+here we use mappings:
+
+    {'proj': 'longlat', 'ellps': 'WGS84', 'datum': 'WGS84', 'no_defs': True}
+"""
+
+from six import string_types
+
+
+def to_string(crs):
+    """Turn a parameter mapping into a more conventional PROJ.4 string.
+
+    Mapping keys are tested against the ``all_proj_keys`` list. Values of
+    ``True`` are omitted, leaving the key bare: {'no_defs': True} -> "+no_defs"
+    and items where the value is otherwise not a str, int, or float are
+    omitted.
+    """
+    items = []
+    for k, v in sorted(filter(
+            lambda x: x[0] in all_proj_keys and x[1] is not False and (
+                isinstance(x[1], (bool, int, float)) or
+                isinstance(x[1], string_types)),
+            crs.items())):
+        items.append(
+            "+" + "=".join(
+                map(str, filter(
+                    lambda y: (y or y == 0) and y is not True, (k, v)))))
+    return " ".join(items)
+
+
+def from_string(prjs):
+    """Turn a PROJ.4 string into a mapping of parameters.
+
+    Bare parameters like "+no_defs" are given a value of ``True``. All keys
+    are checked against the ``all_proj_keys`` list.
+    """
+    parts = [o.lstrip('+') for o in prjs.strip().split()]
+
+    def parse(v):
+        try:
+            return int(v)
+        except ValueError:
+            pass
+        try:
+            return float(v)
+        except ValueError:
+            return v
+    items = map(
+        lambda kv: len(kv) == 2 and (kv[0], parse(kv[1])) or (kv[0], True),
+        (p.split('=') for p in parts))
+    return dict((k, v) for k, v in items if k in all_proj_keys)
+
+
+def from_epsg(code):
+    """Given an integer code, returns an EPSG-like mapping.
+
+    Note: the input code is not validated against an EPSG database.
+    """
+    if int(code) <= 0:
+        raise ValueError("EPSG codes are positive integers")
+    return {'init': "epsg:%s" % code, 'no_defs': True}
+
+
+# Below is the big list of PROJ4 parameters from
+# http://trac.osgeo.org/proj/wiki/GenParms.
+# It is parsed into a list of parameter keys ``all_proj_keys``.
+
+_param_data = """
++a         Semimajor radius of the ellipsoid axis
++alpha     ? Used with Oblique Mercator and possibly a few others
++axis      Axis orientation (new in 4.8.0)
++b         Semiminor radius of the ellipsoid axis
++datum     Datum name (see `proj -ld`)
++ellps     Ellipsoid name (see `proj -le`)
++init      Initialize from a named CRS
++k         Scaling factor (old name)
++k_0       Scaling factor (new name)
++lat_0     Latitude of origin
++lat_1     Latitude of first standard parallel
++lat_2     Latitude of second standard parallel
++lat_ts    Latitude of true scale
++lon_0     Central meridian
++lonc      ? Longitude used with Oblique Mercator and possibly a few others
++lon_wrap  Center longitude to use for wrapping (see below)
++nadgrids  Filename of NTv2 grid file to use for datum transforms (see below)
++no_defs   Don't use the /usr/share/proj/proj_def.dat defaults file
++over      Allow longitude output outside -180 to 180 range, disables wrapping (see below)
++pm        Alternate prime meridian (typically a city name, see below)
++proj      Projection name (see `proj -l`)
++south     Denotes southern hemisphere UTM zone
++to_meter  Multiplier to convert map units to 1.0m
++towgs84   3 or 7 term datum transform parameters (see below)
++units     meters, US survey feet, etc.
++vto_meter vertical conversion to meters.
++vunits    vertical units.
++x_0       False easting
++y_0       False northing
++zone      UTM zone
++a         Semimajor radius of the ellipsoid axis
++alpha     ? Used with Oblique Mercator and possibly a few others
++azi
++b         Semiminor radius of the ellipsoid axis
++belgium
++beta
++czech
++e         Eccentricity of the ellipsoid = sqrt(1 - b^2/a^2) = sqrt( f*(2-f) )
++ellps     Ellipsoid name (see `proj -le`)
++es        Eccentricity of the ellipsoid squared
++f         Flattening of the ellipsoid (often presented as an inverse, e.g. 1/298)
++gamma
++geoc
++guam
++h
++k         Scaling factor (old name)
++K
++k_0       Scaling factor (new name)
++lat_0     Latitude of origin
++lat_1     Latitude of first standard parallel
++lat_2     Latitude of second standard parallel
++lat_b
++lat_t
++lat_ts    Latitude of true scale
++lon_0     Central meridian
++lon_1
++lon_2
++lonc      ? Longitude used with Oblique Mercator and possibly a few others
++lsat
++m
++M
++n
++no_cut
++no_off
++no_rot
++ns
++o_alpha
++o_lat_1
++o_lat_2
++o_lat_c
++o_lat_p
++o_lon_1
++o_lon_2
++o_lon_c
++o_lon_p
++o_proj
++over
++p
++path
++proj      Projection name (see `proj -l`)
++q
++R
++R_a
++R_A       Compute radius such that the area of the sphere is the same as the area of the ellipsoid
++rf        Reciprocal of the ellipsoid flattening term (e.g. 298)
++R_g
++R_h
++R_lat_a
++R_lat_g
++rot
++R_V
++s
++south     Denotes southern hemisphere UTM zone
++sym
++t
++theta
++tilt
++to_meter  Multiplier to convert map units to 1.0m
++units     meters, US survey feet, etc.
++vopt
++W
++westo
++x_0       False easting
++y_0       False northing
++zone      UTM zone
++wktext    Marker
+"""
+
+_lines = filter(lambda x: len(x) > 1, _param_data.split("\n"))
+all_proj_keys = list(
+    set(line.split()[0].lstrip("+").strip() for line in _lines)) + ['no_mayo']