Class: Patm::Pattern::Arr
- Inherits:
-
Patm::Pattern
- Object
- Patm::Pattern
- Patm::Pattern::Arr
- Defined in:
- lib/patm.rb
Instance Method Summary collapse
- #compile_internal(free_index, target_name = "_obj") ⇒ Object
- #execute(mmatch, obj) ⇒ Object
-
#initialize(head, rest = nil, tail = []) ⇒ Arr
constructor
A new instance of Arr.
- #inspect ⇒ Object
Methods inherited from Patm::Pattern
#&, build_from, #compile, #rest?
Constructor Details
#initialize(head, rest = nil, tail = []) ⇒ Arr
Returns a new instance of Arr.
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# File 'lib/patm.rb', line 73 def initialize(head, rest = nil, tail = []) @head = head @rest = rest @tail = tail end |
Instance Method Details
#compile_internal(free_index, target_name = "_obj") ⇒ Object
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# File 'lib/patm.rb', line 100 def compile_internal(free_index, target_name = "_obj") i = free_index srcs = [] ctxs = [] srcs << "#{target_name}.is_a?(::Array)" size_min = @head.size + @tail.size if @rest srcs << "#{target_name}.size >= #{size_min}" else srcs << "#{target_name}.size == #{size_min}" end elm_target_name = "#{target_name}_elm" @head.each_with_index do|h, hi| s, c, i = h.compile_internal(i, elm_target_name) srcs << "(#{elm_target_name} = #{target_name}[#{hi}]; #{s})" ctxs << c end srcs << "(#{target_name}_t = #{target_name}[(-#{@tail.size})..-1]; true)" @tail.each_with_index do|t, ti| s, c, i = t.compile_internal(i, elm_target_name) srcs << "(#{elm_target_name} = #{target_name}_t[#{ti}]; #{s})" ctxs << c end if @rest tname = "#{target_name}_r" s, c, i = @rest.compile_internal(i, tname) srcs << "(#{tname} = #{target_name}[#{@head.size}..-(#{@tail.size+1})];#{s})" ctxs << c end [ srcs.map{|s| "(#{s})"}.join(" &&\n"), ctxs.flatten(1), i ] end |
#execute(mmatch, obj) ⇒ Object
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# File 'lib/patm.rb', line 79 def execute(mmatch, obj) size_min = @head.size + @tail.size return false unless obj.is_a?(Array) return false unless @rest ? (obj.size >= size_min) : (obj.size == size_min) @head.zip(obj[0..(@head.size - 1)]).all? {|pat, o| pat.execute(mmatch, o) } && @tail.zip(obj[(-@tail.size)..-1]).all? {|pat, o| pat.execute(mmatch, o) } && (!@rest || @rest.execute(mmatch, obj[@head.size..-(@tail.size+1)])) end |
#inspect ⇒ Object
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# File 'lib/patm.rb', line 92 def inspect if @rest (@head + [@rest] + @tail).inspect else (@head + @tail).inspect end end |