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require 'json'
require 'csv'
require 'rgeo'
require 'rgeo-geojson'
class Parser
def initialize()
@list_of_locations = {}
@list_of_locations["type"] = "FeatureCollection"
@list_of_locations["features"] = []
end
def fuse_two_entries(entry_1, entry_2) #Outputs a string that contains the value of the two entries, or only one if they repeat
if entry_1 and entry_2
if entry_1 != entry_2
return entry_1 + " ou " + entry_2
else
return entry_1
end
elsif entry_1
return entry_1
elsif entry_2
return entry_2
else
return nil
end
end
def reverse_endianness(string) #Reverse endianness of the received string, by chunk of two hexadecimal characters
res = ""
while string.length > 0
res += string[-2..-1]
string = string[0..-3]
end
return res
end
def cut_from_wkb(string) #Removes data that stumped the Rgeo library
res = string[0..6] + string[15..-1]
return res
end
def reverse_polygon_endianness(string)
res = ""
endian = string[0..1] #Reverse the endianness of the metadata of the polygon
string = string[2..-1]
if endian == "01"
res += "00"
for i in 0..3
res += reverse_endianness(string[0..7])
string = string[8..-1]
end
end
while string != nil and string.length > 0 #Reverse Endianness of the coordinates of each point
res += reverse_endianness(string[0..15])
string = string[16..-1]
end
res = res[0..9] + res[18..-1] #Removes data that stumped the RGeo library
res[2] = "0"
return res
end
def reverse_multipolygon_endianness(string)
res = ""#Reverse the endianness of the metadata of the multipolygon
res += "00"
string = string[2..-1]
for i in 0..2
res += reverse_endianness(string[0..7])
number_of_elements = string[0..1]
string = string[8..-1]
end
res += "00"
string = string[2..-1]
res += reverse_endianness(string[0..7]) #Polygon type stored here
string = string[8..-1]
number_of_polygons = string[0..1].to_i(16)
res += reverse_endianness(string[0..7]) #Number_of_polygons stored here
string = string[8..-1]
for i in 0..number_of_polygons-1 #Reverse Endianness of the coordinates of each point
number_of_duo_of_values = string[0..1].to_i(16)
res += reverse_endianness(string[0..7]) #Number_of_duo_of_values stored here
string = string[8..-1]
for j in 0..number_of_duo_of_values-1
res += reverse_endianness(string[0..15])
string = string[16..-1]
res += reverse_endianness(string[0..15])
string = string[16..-1]
end
end
res = res[0..9] + res[18..-1] #Removes data that stumped the RGeo library
res[2] = "0"
return res
end
def reverse_wkb_endianness(string) #Check if an element is a polygon or a multipolygon (might need different shapes in the future, like a point or a line
if string[3] == "6"
res = reverse_multipolygon_endianness(string)
elsif string[3] == "3"
res = reverse_polygon_endianness(string)
else
puts "ALERT"
res = cut_from_wkb(string)
end
return res
end
def parsePotagersFiles(data_file)
data = CSV.parse(File.read(data_file), headers: true, :col_sep => ",")
factory = RGeo::Cartesian.factory
i = 0
while i < data.length
begin
new_item = {}
new_item["type"] = "Feature"
#Coordinates
string = reverse_wkb_endianness(data[i]["the_geom"])
geom = factory.parse_wkb(string)
geom = RGeo::GeoJSON.encode(geom)
new_item["geometry"] = geom
#IN COMMON data
new_item["properties"] = {}
new_item["properties"]["name"] = fuse_two_entries(data[i]["nom"], data[i]["name"])
new_item["properties"]["description"] = data[i]["descriptio"]
new_item["properties"]["entry_number"] = data[i]["cartodb_id"]
new_item["properties"]["phone_number"] = "" #No equivalent in potagers database
new_item["properties"]["website"] = "" #No equivalent in potagers database
#There is two fields for emails, "email" and "email_2", so if both are filled, puts "or" between the two emails
new_item["properties"]["mail"] = fuse_two_entries(data[i]["email"], data[i]["email_2"])
#There is two fields for address, "rue_num" and "rue", sometimes a field is empty, so a string is constructed with nil as a parameter, to create "" and add to the address string
new_item["properties"]["address"] = String(data[i]["rue"]) + " " + String(data[i]["rue_num"])
new_item["properties"]["city"] = data[i]["n_commune"]
new_item["properties"]["postal_code"] = "" #No equivalent in potagers database
new_item["properties"]["categories"] = [43]
new_item["properties"]["source"] = data[i]["source"]
#Supplementary data
new_item["meta"] = {}
new_item["meta"]["commentaire"] = data[i]["comment_2"]
new_item["meta"]["visibilite"] = data[i]["visibilite"]
new_item["meta"]["acces"] = data[i]["acces"]
new_item["meta"]["accessibilite"] = data[i]["accessibil"]
new_item["meta"]["horaires"] = data[i]["horaires"]
new_item["meta"]["utilisation"] = data[i]["utilisatio"]
new_item["meta"]["type_de_lo"] = data[i]["type_de_lo"]
new_item["meta"]["pollution"] = data[i]["pollution"]
new_item["meta"]["pleine_t_1"] = data[i]["pleine_t_1"]
new_item["meta"]["compost"] = data[i]["compost"]
new_item["meta"]["g4_analyse"] = data[i]["g4_analyse"]
new_item["meta"]["g3_autre_a"] = data[i]["g3_autre_a"]
new_item["meta"]["g3_colla_1"] = data[i]["g3_colla_1"]
new_item["meta"]["g3_finance"] = data[i]["g3_finance"]
new_item["meta"]["g3_finance_2"] = data[i]["g3_finance"]
new_item["meta"]["vandalisme"] = data[i]["vandalisme"]
new_item["meta"]["g3_accord_2"] = data[i]["g3_accor_2"]
new_item["meta"]["accord avec"] = data[i]["accord_ave"]
new_item["meta"]["proprietaire"] = fuse_two_entries(data[i]["proprietai"], data[i]["propriet_1"])
new_item["meta"]["forme_juridique"] = data[i]["forme_juri"]
new_item["meta"]["g2_participants"] = data[i]["g2_partici"]
new_item["meta"]["gestionnaire"] = data[i]["gestionnai"]
new_item["meta"]["pleine_ter"] = data[i]["pleine_ter"]
new_item["meta"]["license"] = data[i]["licence"]
new_item["meta"]["icon"] = data[i]["icon"]
new_item["meta"]["code_potager"] = data[i]["code_potag"]
new_item["meta"]["type"] = data[i]["type"]
new_item["meta"]["historique"] = data[i]["historique"]
new_item["meta"]["annee_de_creation"] = data[i]["annee_de_c"]
new_item["meta"]["adresse_co"] = data[i]["adresse_co"]
new_item["meta"]["begin"] = data[i]["begin"]
new_item["meta"]["end"] = data[i]["end"]
new_item["meta"]["area_sqm"] = data[i]["area_sqm"]
new_item["meta"]["area_acres"] = data[i]["area_acres"]
new_item["properties"]["srid"] = "4326"
@list_of_locations["features"].push(new_item)
rescue RGeo::Error::InvalidGeometry => e
puts "---"
puts "Donnee numero " + i.to_s + " invalide. Erreur: " + e.to_s
puts "valeur: " + data[i]["the_geom"]
end
i += 1
end
end
def writeToFile(write_file)
File.write(write_file, JSON.pretty_generate(@list_of_locations))
end
end
BEGIN {
puts "Starting parser"
}
parser = Parser.new()
parser.parsePotagersFiles("potagers_merged_spjoined_ar2_1.csv.diff")
parser.writeToFile("LocationsPotagers.geojson")
END {
puts "Ending parser"
}
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