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module Opal
# [Opal::Sexp] is used to build up the syntax tree inside [Opal::Parser]. The
# compiler then steps through the sexp trees to generate the javascript code.
#
# For example, an array of integers `[1, 2]` might be represented by:
#
# s(:array, s(:int, 1), s(:int, 2))
#
class Sexp
attr_reader :array
attr_accessor :source
def initialize(args)
@array = args
end
def type
@array[0]
end
def type=(type)
@array[0] = type
end
def children
@array[1..-1]
end
def meta
@meta ||= {}
end
def method_missing(sym, *args, &block)
@array.send sym, *args, &block
end
def <<(other)
@array << other
self
end
def push(*parts)
@array.push(*parts)
self
end
def concat(children)
@array.concat(children)
self
end
def to_ary
@array
end
def dup
Sexp.new(@array.dup)
end
def ==(other)
if other.is_a? Sexp
@array == other.array
else
@array == other
end
end
alias eql? ==
def line
@source && @source[0]
end
def column
@source && @source[1]
end
def inspect
"(#{@array.map { |e| e.inspect }.join ', '})"
end
def pretty_inspect
"(#{line ? "#{line} " : ''}#{@array.map { |e| e.inspect }.join ', '})"
end
alias to_s inspect
end
end
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15 entries across 15 versions & 1 rubygems