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# File 'lib/kpeg/grammar_renderer.rb', line 78
def render_op(io, op)
case op
when Dot
io.print "."
when LiteralString
esc = GrammarRenderer.escape op.string
io.print '"'
io.print esc
io.print '"'
when LiteralRegexp
io.print op.regexp.inspect
when CharRange
io.print "[#{op.start}-#{op.fin}]"
when Sequence
op.ops.each_with_index do |r,idx|
unless idx == 0
io.print " "
end
render_op io, r
end
when Choice
io.print "("
op.ops.each_with_index do |r,idx|
unless idx == 0
io.print " | "
end
render_op io, r
end
io.print ")"
when Multiple
if parens?(op.op)
io.print "("
render_op io, op.op
io.print ")"
else
render_op io, op.op
end
if op.max
if op.min == 0 and op.max == 1
io.print "?"
else
io.print "[#{op.min}, #{op.max}]"
end
elsif op.min == 0
io.print "*"
elsif op.min == 1
io.print "+"
else
io.print "[#{op.min},*]"
end
when AndPredicate
io.print "&"
if parens?(op.op)
io.print "("
render_op io, op.op
io.print ")"
else
render_op io, op.op
end
when NotPredicate
io.print "!"
if parens?(op.op)
io.print "("
render_op io, op.op
io.print ")"
else
render_op io, op.op
end
when RuleReference
if op.arguments
io.print "#{op.rule_name}#{op.arguments}"
else
io.print "#{op.rule_name}"
end
when InvokeRule
if op.arguments
io.print "@#{op.rule_name}#{op.arguments}"
else
io.print "@#{op.rule_name}"
end
when ForeignInvokeRule
if op.arguments
io.print "%#{op.grammar_name}.#{op.rule_name}#{op.arguments}"
else
io.print "%#{op.grammar_name}.#{op.rule_name}"
end
when Tag
if parens?(op.op)
io.print "("
render_op io, op.op
io.print ")"
else
render_op io, op.op
end
if op.tag_name
io.print ":#{op.tag_name}"
end
when Action
io.print "{#{op.action}}"
when Collect
io.print "< "
render_op io, op.op
io.print " >"
when Bounds
io.print "@< "
render_op io, op.op
io.print " >"
else
raise "Unknown op type - #{op.class}"
end
end
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