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class SplineTypeException < RuntimeError
end
# spliteType or point
#
# spline ( ';' spline )*
# where spline = (endp)? (startp)? point (triple)+
# and triple = point point point
# and endp = "e,%f,%f"
# and startp = "s,%f,%f"
#
# If a spline has points p1 p2 p3 ... pn, (n = 1 (mod 3)), the points correspond
# to the control points of a B-spline from p1 to pn. If startp is given, it touches
# one node of the edge, and the arrowhead goes from p1 to startp. If startp is not
# given, p1 touches a node. Similarly for pn and endp.
class GraphViz
class Types
class SplineType < Common
FLOAT_MASK = /[-+]?(?:[0-9]*\.[0-9]+|[0-9]+)/
ENDP_MASK = /e\s*,\s*#{FLOAT_MASK}\s*,\s*#{FLOAT_MASK}/
STARTP_MASK = /s\s*,\s*#{FLOAT_MASK}\s*,\s*#{FLOAT_MASK}/
POINT_MASK = /#{FLOAT_MASK}\s*,\s*#{FLOAT_MASK}(?:\s*,\s*#{FLOAT_MASK})?!?/
TRIPLE_MASK = /#{POINT_MASK}\s+#{POINT_MASK}\s+#{POINT_MASK}/
SPLINE_MASK = /(?:#{ENDP_MASK}\s+)?(?:#{STARTP_MASK}\s+)?#{POINT_MASK}(?:\s*#{TRIPLE_MASK})+/
FINAL_SPLINE_MASK = /^#{SPLINE_MASK}(?:\s*;\s*#{SPLINE_MASK})*$/
FINAL_POINT_MASK = /^#{POINT_MASK}$/
def check(data)
unless SPLINE_MASK.match(data).nil?
@is_spline = true
return data
end
unless FINAL_POINT_MASK.match(data).nil?
@is_spline = false
return data
end
return nil if data.empty?
raise SplineTypeException, "Invalid spline type value"
end
def output
return @data.to_s.inspect.gsub( "\\\\", "\\" )
end
alias :to_gv :output
alias :to_s :output
def point
if point?
"[#{@data}]".to_ruby
else
# TODO!
end
end
def endp
end
def startp
end
def triples
end
private
def point?
not @is_spline
end
def splite_type?
@is_spline
end
end
end
end
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