Class: RGeo::CoordSys::CS::WKTParser
- Inherits:
-
Object
- Object
- RGeo::CoordSys::CS::WKTParser
- Defined in:
- lib/rgeo/coord_sys/cs/wkt_parser.rb
Overview
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Defined Under Namespace
Classes: ArgumentList, AuthorityClause, QuotedString, TypeString
Instance Method Summary collapse
-
#consume_token_type(type_) ⇒ Object
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-
#cur_token ⇒ Object
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-
#expect_token_type(type_) ⇒ Object
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-
#initialize(str_) ⇒ WKTParser
constructor
A new instance of WKTParser.
-
#next_token ⇒ Object
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- #parse(containing_type_ = nil) ⇒ Object
Constructor Details
#initialize(str_) ⇒ WKTParser
Returns a new instance of WKTParser.
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# File 'lib/rgeo/coord_sys/cs/wkt_parser.rb', line 47 def initialize(str_) @scanner = ::StringScanner.new(str_) next_token end |
Instance Method Details
#consume_token_type(type_) ⇒ Object
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# File 'lib/rgeo/coord_sys/cs/wkt_parser.rb', line 172 def consume_token_type(type_) # :nodoc: expect_token_type(type_) tok_ = @cur_token next_token tok_ end |
#cur_token ⇒ Object
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# File 'lib/rgeo/coord_sys/cs/wkt_parser.rb', line 217 def cur_token # :nodoc: @cur_token end |
#expect_token_type(type_) ⇒ Object
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# File 'lib/rgeo/coord_sys/cs/wkt_parser.rb', line 179 def expect_token_type(type_) # :nodoc: unless type_ === @cur_token raise Error::ParseError, "#{type_.inspect} expected but #{@cur_token.inspect} found." end end |
#next_token ⇒ Object
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# File 'lib/rgeo/coord_sys/cs/wkt_parser.rb', line 185 def next_token # :nodoc: @scanner.skip(/\s+/) case @scanner.peek(1) when '"' @scanner.getch @cur_token = QuotedString.new(@scanner.scan(/[^"]*/)) @scanner.getch when ',' @scanner.getch @cur_token = :comma when '(','[' @scanner.getch @cur_token = :begin when ']',')' @scanner.getch @cur_token = :end when /[a-zA-Z]/ @cur_token = TypeString.new(@scanner.scan(/[a-zA-Z]\w*/)) when '', nil @cur_token = nil else @scanner.scan_until(/[^\s\(\)\[\],"]+/) token_ = @scanner.matched if token_ =~ /^[-+]?(\d+(\.\d*)?|\.\d+)(e[-+]?\d+)?$/ @cur_token = token_.to_f else raise Error::ParseError, "Bad token: #{token_.inspect}" end end @cur_token end |
#parse(containing_type_ = nil) ⇒ Object
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# File 'lib/rgeo/coord_sys/cs/wkt_parser.rb', line 53 def parse(containing_type_=nil) if @cur_token.kind_of?(QuotedString) || @cur_token.kind_of?(::Numeric) || (containing_type_ == 'AXIS' && @cur_token.kind_of?(TypeString)) value_ = @cur_token next_token return value_ end unless @cur_token.kind_of?(TypeString) raise Error::ParseError("Found token #{@cur_token} when we expected a value") end type_ = @cur_token next_token consume_token_type(:begin) args_ = ArgumentList.new args_ << parse(type_) loop do break unless @cur_token == :comma next_token args_ << parse(type_) end consume_token_type(:end) obj_ = nil case type_ when 'AUTHORITY' obj_ = AuthorityClause.new(args_.shift(QuotedString), args_.shift(QuotedString)) when 'AXIS' obj_ = AxisInfo.create(args_.shift(QuotedString), args_.shift(TypeString)) when 'TOWGS84' bursa_wolf_params_ = args_.find_all(::Numeric) unless bursa_wolf_params_.size == 7 raise Error::ParseError("Expected 7 Bursa Wolf parameters but found #{bursa_wolf_params_.size}") end obj_ = WGS84ConversionInfo.create(*bursa_wolf_params_) when 'UNIT' case containing_type_ when 'GEOCCS', 'VERT_CS', 'PROJCS', 'SPHEROID' klass_ = LinearUnit when 'GEOGCS' klass_ = AngularUnit else klass_ = Unit end obj_ = klass_.create(args_.shift(QuotedString), args_.shift(::Numeric), *args_.find_first(AuthorityClause).to_a) when 'PARAMETER' obj_ = ProjectionParameter.create(args_.shift(QuotedString), args_.shift(::Numeric)) when 'PRIMEM' obj_ = PrimeMeridian.create(args_.shift(QuotedString), nil, args_.shift(::Numeric), *args_.find_first(AuthorityClause).to_a) when 'SPHEROID' obj_ = Ellipsoid.create_flattened_sphere(args_.shift(QuotedString), args_.shift(::Numeric), args_.shift(::Numeric), args_.find_first(LinearUnit), *args_.find_first(AuthorityClause).to_a) when 'PROJECTION' name_ = args_.shift(QuotedString) obj_ = Projection.create(name_, name_, args_.find_all(ProjectionParameter), *args_.find_first(AuthorityClause).to_a) when 'DATUM' name_ = args_.shift(QuotedString) ellipsoid_ = args_.find_first(Ellipsoid) to_wgs84_ = args_.find_first(WGS84ConversionInfo) obj_ = HorizontalDatum.create(name_, HD_GEOCENTRIC, ellipsoid_, to_wgs84_, *args_.find_first(AuthorityClause).to_a) when 'VERT_DATUM' obj_ = VerticalDatum.create(args_.shift(QuotedString), args_.shift(::Numeric), *args_.find_first(AuthorityClause).to_a) when 'LOCAL_DATUM' obj_ = LocalDatum.create(args_.shift(QuotedString), args_.shift(::Numeric), *args_.find_first(AuthorityClause).to_a) when 'COMPD_CS' obj_ = CompoundCoordinateSystem.create(args_.shift(QuotedString), args_.shift(CoordinateSystem), args_.shift(CoordinateSystem), *args_.find_first(AuthorityClause).to_a) when 'LOCAL_CS' name_ = args_.shift(QuotedString) local_datum_ = args_.find_first(LocalDatum) unit_ = args_.find_first(Unit) axes_ = args_.find_all(AxisInfo) unless axes_.size > 0 raise Error::ParseError("Expected at least one AXIS in a LOCAL_CS") end obj_ = LocalCoordinateSystem.create(name_, local_datum_, unit_, axes_, *args_.find_first(AuthorityClause).to_a) when 'GEOCCS' name_ = args_.shift(QuotedString) horizontal_datum_ = args_.find_first(HorizontalDatum) prime_meridian_ = args_.find_first(PrimeMeridian) linear_unit_ = args_.find_first(LinearUnit) axes_ = args_.find_all(AxisInfo) unless axes_.size == 0 || axes_.size == 3 raise Error::ParseError("GEOCCS must contain either 0 or 3 AXIS parameters") end obj_ = GeocentricCoordinateSystem.create(name_, horizontal_datum_, prime_meridian_, linear_unit_, axes_[0], axes_[1], axes_[2], *args_.find_first(AuthorityClause).to_a) when 'VERT_CS' name_ = args_.shift(QuotedString) vertical_datum_ = args_.find_first(VerticalDatum) linear_unit_ = args_.find_first(LinearUnit) axis_ = args_.find_first(AxisInfo) obj_ = VerticalCoordinateSystem.create(name_, vertical_datum_, linear_unit_, axis_, *args_.find_first(AuthorityClause).to_a) when 'GEOGCS' name_ = args_.shift(QuotedString) horizontal_datum_ = args_.find_first(HorizontalDatum) prime_meridian_ = args_.find_first(PrimeMeridian) angular_unit_ = args_.find_first(AngularUnit) axes_ = args_.find_all(AxisInfo) unless axes_.size == 0 || axes_.size == 2 raise Error::ParseError("GEOGCS must contain either 0 or 2 AXIS parameters") end obj_ = GeographicCoordinateSystem.create(name_, angular_unit_, horizontal_datum_, prime_meridian_, axes_[0], axes_[1], *args_.find_first(AuthorityClause).to_a) when 'PROJCS' name_ = args_.shift(QuotedString) geographic_coordinate_system_ = args_.find_first(GeographicCoordinateSystem) projection_ = args_.find_first(Projection) parameters_ = args_.find_all(ProjectionParameter) projection_.instance_variable_get(:@parameters).concat(parameters_) linear_unit_ = args_.find_first(LinearUnit) axes_ = args_.find_all(AxisInfo) unless axes_.size == 0 || axes_.size == 2 raise Error::ParseError("PROJCS must contain either 0 or 2 AXIS parameters") end obj_ = ProjectedCoordinateSystem.create(name_, geographic_coordinate_system_, projection_, linear_unit_, axes_[0], axes_[1], *args_.find_first(AuthorityClause).to_a) else raise Error::ParseError, "Unrecognized type: #{type_}" end args_.assert_empty obj_ end |