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|
# frozen_string_literal: true
module Unparser
# Buffer used to emit into
class Buffer
NL = "\n".freeze
# Initialize object
#
# @return [undefined]
#
# @api private
#
def initialize
@content = +''
@indent = 0
end
# Append string
#
# @param [String] string
#
# @return [self]
#
# @api private
#
def append(string)
if @content[-1].eql?(NL)
prefix
end
write(string)
self
end
# Append a string without an indentation prefix
#
# @param [String] string
#
# @return [self]
#
# @api private
#
def append_without_prefix(string)
write(string)
end
# Increase indent
#
# @return [self]
#
# @api private
#
def indent
@indent += 1
self
end
# Decrease indent
#
# @return [self]
#
# @api private
#
def unindent
@indent -= 1
self
end
# Write newline
#
# @return [self]
#
# @api private
#
def nl
write(NL)
end
def root_indent
before = @indent
@indent = 0
yield
@indent = before
end
# Test for a fresh line
#
# @return [Boolean]
#
# @api private
#
def fresh_line?
@content.empty? || @content[-1].eql?(NL)
end
# Return content of buffer
#
# @return [String]
#
# @api private
#
def content
@content.dup.freeze
end
# Write raw fragment to buffer
#
# Does not do indentation logic.
#
# @param [String] fragment
#
# @return [self]
def write(fragment)
@content << fragment
self
end
private
INDENT_SPACE = ' '.freeze
def prefix
write(INDENT_SPACE * @indent)
end
end # Buffer
end # Unparser
|
