[Bf-extensions-cvs] [30203a6d] master: sun_position: add geo.py coordinate parser
Damien Picard
noreply at git.blender.org
Fri Sep 20 11:43:38 CEST 2019
Commit: 30203a6dbd44c36f1ada2075a19b06708b9ace99
Author: Damien Picard
Date: Fri Aug 16 23:58:02 2019 +0200
Branches: master
https://developer.blender.org/rBAC30203a6dbd44c36f1ada2075a19b06708b9ace99
sun_position: add geo.py coordinate parser
Code by Maximilian Högner,
http://hoegners.de/Maxi/geo/
===================================================================
A sun_position/geo.py
===================================================================
diff --git a/sun_position/geo.py b/sun_position/geo.py
new file mode 100644
index 00000000..6d49f2ad
--- /dev/null
+++ b/sun_position/geo.py
@@ -0,0 +1,192 @@
+#!/usr/bin/env python
+#
+# geo.py is a python module with no dependencies on extra packages,
+# providing some convenience functions for working with geographic
+# coordinates
+#
+# Copyright (C) 2010 Maximilian Hoegner <hp.maxi at hoegners.de>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+
+### Part one - Functions for dealing with points on a sphere ###
+
+### Part two - A tolerant parser for position strings ###
+import re
+
+
+class Parser:
+ """ A parser class using regular expressions. """
+
+ def __init__(self):
+ self.patterns = {}
+ self.raw_patterns = {}
+ self.virtual = {}
+
+ def add(self, name, pattern, virtual=False):
+ """ Adds a new named pattern (regular expression) that can reference previously added patterns by %(pattern_name)s.
+ Virtual patterns can be used to make expressions more compact but don't show up in the parse tree. """
+ self.raw_patterns[name] = "(?:" + pattern + ")"
+ self.virtual[name] = virtual
+
+ try:
+ self.patterns[name] = ("(?:" + pattern + ")") % self.patterns
+ except KeyError as e:
+ raise (Exception, "Unknown pattern name: %s" % str(e))
+
+ def parse(self, pattern_name, text):
+ """ Parses 'text' with pattern 'pattern_name' and returns parse tree """
+
+ # build pattern with subgroups
+ sub_dict = {}
+ subpattern_names = []
+ for s in re.finditer("%\(.*?\)s", self.raw_patterns[pattern_name]):
+ subpattern_name = s.group()[2:-2]
+ if not self.virtual[subpattern_name]:
+ sub_dict[subpattern_name] = "(" + self.patterns[
+ subpattern_name] + ")"
+ subpattern_names.append(subpattern_name)
+ else:
+ sub_dict[subpattern_name] = self.patterns[subpattern_name]
+
+ pattern = "^" + (self.raw_patterns[pattern_name] % sub_dict) + "$"
+
+ # do matching
+ m = re.match(pattern, text)
+
+ if m == None:
+ return None
+
+ # build tree recursively by parsing subgroups
+ tree = {"TEXT": text}
+
+ for i in range(len(subpattern_names)):
+ text_part = m.group(i + 1)
+ if not text_part == None:
+ subpattern = subpattern_names[i]
+ tree[subpattern] = self.parse(subpattern, text_part)
+
+ return tree
+
+
+position_parser = Parser()
+position_parser.add("direction_ns", r"[NSns]")
+position_parser.add("direction_ew", r"[EOWeow]")
+position_parser.add("decimal_separator", r"[\.,]", True)
+position_parser.add("sign", r"[+-]")
+
+position_parser.add("nmea_style_degrees", r"[0-9]{2,}")
+position_parser.add("nmea_style_minutes",
+ r"[0-9]{2}(?:%(decimal_separator)s[0-9]*)?")
+position_parser.add(
+ "nmea_style", r"%(sign)s?\s*%(nmea_style_degrees)s%(nmea_style_minutes)s")
+
+position_parser.add(
+ "number",
+ r"[0-9]+(?:%(decimal_separator)s[0-9]*)?|%(decimal_separator)s[0-9]+")
+
+position_parser.add("plain_degrees", r"(?:%(sign)s\s*)?%(number)s")
+
+position_parser.add("degree_symbol", r"°", True)
+position_parser.add("minutes_symbol", r"'|′|`|´", True)
+position_parser.add("seconds_symbol",
+ r"%(minutes_symbol)s%(minutes_symbol)s|″|\"",
+ True)
+position_parser.add("degrees", r"%(number)s\s*%(degree_symbol)s")
+position_parser.add("minutes", r"%(number)s\s*%(minutes_symbol)s")
+position_parser.add("seconds", r"%(number)s\s*%(seconds_symbol)s")
+position_parser.add(
+ "degree_coordinates",
+ "(?:%(sign)s\s*)?%(degrees)s(?:[+\s]*%(minutes)s)?(?:[+\s]*%(seconds)s)?|(?:%(sign)s\s*)%(minutes)s(?:[+\s]*%(seconds)s)?|(?:%(sign)s\s*)%(seconds)s"
+)
+
+position_parser.add(
+ "coordinates_ns",
+ r"%(nmea_style)s|%(plain_degrees)s|%(degree_coordinates)s")
+position_parser.add(
+ "coordinates_ew",
+ r"%(nmea_style)s|%(plain_degrees)s|%(degree_coordinates)s")
+
+position_parser.add(
+ "position", """\
+\s*%(direction_ns)s\s*%(coordinates_ns)s[,;\s]*%(direction_ew)s\s*%(coordinates_ew)s\s*|\
+\s*%(direction_ew)s\s*%(coordinates_ew)s[,;\s]*%(direction_ns)s\s*%(coordinates_ns)s\s*|\
+\s*%(coordinates_ns)s\s*%(direction_ns)s[,;\s]*%(coordinates_ew)s\s*%(direction_ew)s\s*|\
+\s*%(coordinates_ew)s\s*%(direction_ew)s[,;\s]*%(coordinates_ns)s\s*%(direction_ns)s\s*|\
+\s*%(coordinates_ns)s[,;\s]+%(coordinates_ew)s\s*\
+""")
+
+
+def get_number(b):
+ """ Takes appropriate branch of parse tree and returns float. """
+ s = b["TEXT"].replace(",", ".")
+ return float(s)
+
+
+def get_coordinate(b):
+ """ Takes appropriate branch of the parse tree and returns degrees as a float. """
+
+ r = 0.
+
+ if b.get("nmea_style"):
+ if b["nmea_style"].get("nmea_style_degrees"):
+ r += get_number(b["nmea_style"]["nmea_style_degrees"])
+ if b["nmea_style"].get("nmea_style_minutes"):
+ r += get_number(b["nmea_style"]["nmea_style_minutes"]) / 60.
+ if b["nmea_style"].get(
+ "sign") and b["nmea_style"]["sign"]["TEXT"] == "-":
+ r *= -1.
+ elif b.get("plain_degrees"):
+ r += get_number(b["plain_degrees"]["number"])
+ if b["plain_degrees"].get(
+ "sign") and b["plain_degrees"]["sign"]["TEXT"] == "-":
+ r *= -1.
+ elif b.get("degree_coordinates"):
+ if b["degree_coordinates"].get("degrees"):
+ r += get_number(b["degree_coordinates"]["degrees"]["number"])
+ if b["degree_coordinates"].get("minutes"):
+ r += get_number(b["degree_coordinates"]["minutes"]["number"]) / 60.
+ if b["degree_coordinates"].get("seconds"):
+ r += get_number(
+ b["degree_coordinates"]["seconds"]["number"]) / 3600.
+ if b["degree_coordinates"].get(
+ "sign") and b["degree_coordinates"]["sign"]["TEXT"] == "-":
+ r *= -1.
+
+ return r
+
+
+def parse_position(s):
+ """ Takes a (utf8-encoded) string describing a position and returns a tuple of floats for latitude and longitude in degrees.
+ Tries to be as tolerant as possible with input. Returns None if parsing doesn't succeed. """
+
+ parse_tree = position_parser.parse("position", s)
+ if parse_tree == None: return None
+
+ lat_sign = +1.
+ if parse_tree.get(
+ "direction_ns") and parse_tree["direction_ns"]["TEXT"] in ("S",
+ "s"):
+ lat_sign = -1.
+
+ lon_sign = +1.
+ if parse_tree.get(
+ "direction_ew") and parse_tree["direction_ew"]["TEXT"] in ("W",
+ "w"):
+ lon_sign = -1.
+
+ lat = lat_sign * get_coordinate(parse_tree["coordinates_ns"])
+ lon = lon_sign * get_coordinate(parse_tree["coordinates_ew"])
+
+ return lat, lon
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