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Versions: 21
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Contents
module Ruby2JS
class Converter
# (case
# (send nil :a)
# (when
# (int 1)
# (...))
# (...))
handle :case do |expr, *whens, other|
begin
if @state == :expression
parse s(:kwbegin, @ast), @state
return
end
inner, @inner = @inner, @ast
has_range = whens.any? do |node|
node.children.any? {|child| [:irange, :erange].include? child&.type}
end
if has_range
# https://stackoverflow.com/questions/5619832/switch-on-ranges-of-integers-in-javascript
puts 'switch (true) {'
else
put 'switch ('; parse expr; puts ') {'
end
whens.each_with_index do |node, index|
puts '' unless index == 0
*values, code = node.children
values.each do |value|
put 'case ';
if has_range
if value.type == :irange
parse expr; put ' >= '; parse value.children.first; put " && "
parse expr; put ' <= '; parse value.children.last; put ":#@ws"
elsif value.type == :erange
parse expr; put ' >= '; parse value.children.first; put " && "
parse expr; put ' < '; parse value.children.last; put ":#@ws"
else
parse expr; put ' == '; parse value; put ":#@ws"
end
else
parse value; put ":#@ws"
end
end
parse code, :statement
last = code
while last&.type == :begin
last = last.children.last
end
if other or index < whens.length-1
put "#{@sep}"
put "break#@sep" unless last.type == :return
end
end
(put "#{@nl}default:#@ws"; parse other, :statement) if other
sput '}'
ensure
@inner = inner
end
end
end
end
Version data entries
21 entries across 21 versions & 1 rubygems