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Versions: 7
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Contents
module SXP
##
# An S-expression generator.
class Generator
##
# @param [Array] sxps
# @return [Object]
def self.string(*sxps)
require 'stringio' unless defined?(StringIO)
write(StringIO.new, *sxps).instance_variable_get('@buffer').string
end
##
# @param [Array] sxps
# @return [Object]
def self.print(*sxps)
write($stdout, *sxps)
end
##
# @param [Object] out
# @param [Array] sxps
# @return [Object]
def self.write(out, *sxps)
generator = self.new(out)
sxps.each do |sxp|
generator.send((op = sxp.shift).to_sym, *sxp)
end
generator
end
##
# @param [Object] buffer
def initialize(buffer)
@output = [@buffer = buffer]
@indent = 0
end
protected
##
# @param [String] text
# @param [Hash{Symbol => Object}] options
# @return [void]
def emit(text, options = {})
if out = @output.last
out.print(' ' * (indent * 2)) if options[:indent]
out.print(text)
end
end
##
# @yield
# @return [String]
def captured(&block)
require 'stringio' unless defined?(StringIO)
begin
@output.push(buffer = StringIO.new)
block.call
ensure
@output.pop
end
buffer.string
end
##
# @yield
# @return [Object]
def indented(&block)
begin
increase_indent!
block.call
ensure
decrease_indent!
end
end
##
# @return [void]
def increase_indent!
@indent += 1
end
##
# @return [void]
def decrease_indent!
@indent -= 1
end
end # Generator
end # SXP
Version data entries
7 entries across 7 versions & 1 rubygems