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# frozen_string_literal: true
module Temple
module Filters
# Control flow filter which processes [:if, condition, yes-exp, no-exp]
# and [:block, code, content] expressions.
# This is useful for ruby code generation with lots of conditionals.
#
# @api public
class ControlFlow < Filter
def on_if(condition, yes, no = nil)
result = [:multi, [:code, "if #{condition}"], compile(yes)]
while no && no.first == :if
result << [:code, "elsif #{no[1]}"] << compile(no[2])
no = no[3]
end
result << [:code, 'else'] << compile(no) if no
result << [:code, 'end']
result
end
def on_case(arg, *cases)
result = [:multi, [:code, arg ? "case (#{arg})" : 'case']]
cases.map do |c|
condition, exp = c
result << [:code, condition == :else ? 'else' : "when #{condition}"] << compile(exp)
end
result << [:code, 'end']
result
end
def on_cond(*cases)
on_case(nil, *cases)
end
def on_block(code, exp)
[:multi,
[:code, code],
compile(exp),
[:code, 'end']]
end
end
end
end
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