mirror of
https://github.com/wassname/PyCRS.git
synced 2026-07-31 12:00:11 +08:00
Wkt parsing into tuples and args now works for easier parsing. Next just need to make them into objs.
This commit is contained in:
Karim Bahgat
+168
-38
@@ -3,6 +3,7 @@
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# possible use module: https://github.com/rockdoc/grabbag/wiki/CRS-WKT-Parser
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# also note some paramter descriptions: http://www.geoapi.org/3.0/javadoc/org/opengis/referencing/doc-files/WKT.html
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# and see gdal source code: http://gis.stackexchange.com/questions/129764/how-are-esri-wkt-projections-different-from-ogc-wkt-projections
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# especially: http://fossies.org/windows/misc/saga_2.1.4_x64.zip/saga_2.1.4_x64/saga_prj.dic
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from . import datums
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from . import ellipsoids
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@@ -36,12 +37,133 @@ def from_sr_code(code):
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## # parse arguments into components
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## # use args to create crs
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## pass
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##
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##def from_ogc_wkt(string):
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## # parse arguments into components
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## # use args to create crs
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## pass
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##
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def from_ogc_wkt(string):
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# remove newlines and multi spaces
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string = " ".join(string.split())
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# parse arguments into components
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def _consume_bracket(chars, char):
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"char must be the opening bracket"
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consumed = ""
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depth = 1
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while char and depth > 0:
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consumed += char
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char = next(chars, None)
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# update depth level
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if char == "[":
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depth += 1
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elif char == "]":
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depth -= 1
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consumed += char # consume the last closing char too
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return consumed
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def _consume_quote(chars, char, quotechar):
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"char and quotechar must be the opening quote char"
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consumed = ""
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# consume the first opening char
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consumed += char
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char = next(chars, None)
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# consume inside
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while char and char != quotechar:
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consumed += char
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char = next(chars, None)
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# consume the last closing char too
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consumed += char
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return consumed
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def _next_elem(chars, char):
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"char can be any char"
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header = ""
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# skip until next header
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while not char.isalpha():
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char = next(chars, None)
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# first consume the element text header
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while char.isalpha():
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header += char
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char = next(chars, None)
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# skip until next brackets (in case of spaces)
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while char != "[":
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char = next(chars, None)
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# then consume the element bracket contents
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if char == "[":
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content = _consume_bracket(chars, char)
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char = next(chars, None)
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# split content into args list
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content = content[1:-1] # remove enclosing brackets
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content = _split_except(content)
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# recursively load all subelems
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for i,item in enumerate(content):
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if isinstance(item, str) and "[" in item:
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chars = (char for char in item)
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char = next(chars)
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item = _next_elem(chars, char)
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content[i] = item
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return header, content
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def _clean_value(string):
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string = string.strip()
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try: string = float(string)
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except: pass
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return string
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def _split_except(string):
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chars = (char for char in string)
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char = next(chars)
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items = []
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consumed = ""
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while char:
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# dont split on quotes, just consume it
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if char in ("'", '"'):
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consumed += _consume_quote(chars, char, char)
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# dont split inside brackets, just consume it
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elif char == "[":
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consumed += _consume_bracket(chars, char)
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# make new splititem
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elif char == ",":
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consumed = _clean_value(consumed)
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items.append(consumed)
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consumed = ""
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# consume normal char
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elif char:
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consumed += char
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# next
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char = next(chars, None)
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# append last item too
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consumed = _clean_value(consumed)
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items.append(consumed)
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return items
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# load into nested tuples and arglists
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crstuples = []
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chars = (char for char in string)
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char = next(chars)
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while char:
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header,content = _next_elem(chars, char)
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crstuples.append((header, content))
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char = next(chars, None)
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# parse into actual crs objects
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for header, content in crstuples:
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# toplevel collection
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if header.upper() == "PROJCS":
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# find name
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# find geogcs elem
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# find projection elem
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# find params
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# find unit
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pass
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#projcs = parameters.ProjCS("Unknown", geogcs, proj, params, unit)
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elif header.upper() == "GEOGCS":
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pass
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# use args to create crs
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return crstuples
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##def from_unknown_wkt(string):
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## # detect if ogc wkt or esri wkt
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## # TIPS: esri wkt datums all use "D_" before the datum name
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@@ -61,6 +183,13 @@ def from_proj4(string):
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# INIT CODES...?
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# eg, +init=epsg code...?
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if "+init" in partdict:
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codetype, code = partdict["+init"].split(":")
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if codetype == "EPSG":
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crs = from_epsg_code(code)
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# need to get individual elements from crs
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# maybe from web...
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# DATUM
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@@ -68,11 +197,15 @@ def from_proj4(string):
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if "+datum" in partdict:
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# get predefined datum def
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if partdict["+datum"] == "WGS84":
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datumdef = datums.WGS84()
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elif partdict["+datum"] == "NAD83":
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datumdef = datums.NAD83()
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for itemname in dir(datums):
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item = getattr(datums, itemname)
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try:
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item = item()
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if hasattr(item, "proj4") and partdict["+datum"] == item.proj4:
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datumdef = item
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break
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except:
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pass
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else:
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datumdef = datums.Unknown()
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@@ -86,17 +219,15 @@ def from_proj4(string):
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if "+ellps" in partdict:
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# get predefined ellips def
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if partdict["+ellps"] == "WGS84":
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ellipsdef = ellipsoids.WGS84()
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elif partdict["+ellps"] == "WGS72":
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ellipsdef = ellipsoids.WGS72()
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elif partdict["+ellps"] == "intl":
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ellipsdef = ellipsoids.International()
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elif partdict["+ellps"] == "GRS80":
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ellipsdef = ellipsoids.GRS80()
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for itemname in dir(ellipsoids):
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item = getattr(ellipsoids, itemname)
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try:
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item = item()
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if hasattr(item, "proj4") and partdict["+ellps"] == item.proj4:
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ellipsdef = item
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break
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except:
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pass
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else:
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raise Exception("Could not find required +ellps element")
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@@ -163,22 +294,15 @@ def from_proj4(string):
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if "+proj" in partdict:
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# get predefined proj def
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if partdict["+proj"] == "robin":
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projdef = projections.Robinson()
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elif partdict["+proj"] == "omerc":
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projdef = projections.ObliqueMercator()
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elif partdict["+proj"] == "longlat":
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projdef = None
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# set geogcs axis in correct order
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elif partdict["+proj"] == "latlong":
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projdef = None
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# set geogcs axis in correct order
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# ALSO SHOULDNT EXCLUDE +proj, NEED WAY TO INCLUDE IT...
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# ...
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for itemname in dir(projections):
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item = getattr(projections, itemname)
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try:
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item = item()
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if hasattr(item, "proj4") and partdict["+proj"] == item.proj4:
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projdef = item
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break
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except:
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pass
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else:
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projdef = None
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@@ -278,6 +402,12 @@ def from_proj4(string):
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## create unitobj
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unit = parameters.Unit(unittype, metmulti)
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# SATELLITE HEIGHT
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if "+h" in partdict:
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val = partdict["+h"]
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obj = parameters.SatelliteHeight(val)
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params.append(obj)
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# PROJCS
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projcs = parameters.ProjCS("Unknown", geogcs, proj, params, unit)
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