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|
module CodeRay
module Encoders
# = LaTeX Encoder
#
# Encoder producing LaTeX.
class Latex < Encoder
include Streamable
register_for :latex
FILE_EXTENSION = 'tex'
DEFAULT_OPTIONS = {
:wrap => true,
}
protected
def text_token text, kind
@out <<
if kind == :space
text
else
text = escape_latex(text)
"\\syn#{kind_to_command(kind)}{#{text}}"
end
end
def block_token action, kind
@out << super
end
def open_token kind
"\\syn#{kind_to_command(kind)}{"
end
def close_token kind
"}"
end
def kind_to_command kind
kind.to_s.gsub(/[^a-z0-9]/i, '').to_sym
end
def finish options
case options[:wrap]
when true, 1, :semiverbatim
@out = "\\begin{semiverbatim}\n#{@out}\n\\end{semiverbatim}\n"
when false, 0
# Nothing to do
else
raise ArgumentError, "Unknown :wrap option: '#{options[:wrap]}'"
end
super
end
# Escape text so it's interpreted literally by LaTeX compilers
def escape_latex string
string.to_s.gsub(/[$\\{}_%#&~^"]/) do |s|
case s
when '$'
'\$'
when '\\'
'\synbs{}'
when /[{}_%#&]/
"\\#{s}"
when /[~^]/
"\\#{s}{}"
when '"'
'"{}'
end
end
end
end
end
end
|
