Sha256: f5dd138fdfec0c8d4e7129c1e33461a609392f2be921ea1c92378f1f6118617d
Contents?: true
Size: 1.9 KB
Versions: 6
Compression:
Stored size: 1.9 KB
Contents
module Ruby2JS
class Converter
# (case
# (send nil :a)
# (when
# (int 1)
# (...))
# (...))
handle :case do |expr, *whens, other|
begin
scope, @scope = @scope, false
mark = output_location
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
put "#{@sep}break#@sep" if other or index < whens.length-1
end
(put "#{@nl}default:#@ws"; parse other, :statement) if other
sput '}'
if scope
vars = @vars.select {|key, value| value == :pending}.keys
unless vars.empty?
insert mark, "#{es2015 ? 'let' : 'var'} #{vars.join(', ')}#{@sep}"
vars.each {|var| @vars[var] = true}
end
end
ensure
@scope = scope
end
end
end
end
Version data entries
6 entries across 6 versions & 1 rubygems