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# -*- coding: utf-8 -*- #
# frozen_string_literal: true
module Rouge
# A Formatter takes a token stream and formats it for human viewing.
class Formatter
# @private
REGISTRY = {}
# Specify or get the unique tag for this formatter. This is used
# for specifying a formatter in `rougify`.
def self.tag(tag=nil)
return @tag unless tag
REGISTRY[tag] = self
@tag = tag
end
# Find a formatter class given a unique tag.
def self.find(tag)
REGISTRY[tag]
end
def self.with_escape
Thread.current[:'rouge/with-escape'] = true
yield
ensure
Thread.current[:'rouge/with-escape'] = false
end
def self.escape_enabled?
!!(((defined? @escape_enabled) && @escape_enabled) || Thread.current[:'rouge/with-escape'])
end
def self.enable_escape!
@escape_enabled = true
end
def self.disable_escape!
@escape_enabled = false
Thread.current[:'rouge/with-escape'] = false
end
# Format a token stream. Delegates to {#format}.
def self.format(tokens, *args, **kwargs, &b)
new(*args, **kwargs).format(tokens, &b)
end
def initialize(opts={})
# pass
end
def escape?(tok)
tok == Token::Tokens::Escape
end
def filter_escapes(tokens)
tokens.each do |t, v|
if t == Token::Tokens::Escape
yield Token::Tokens::Error, v
else
yield t, v
end
end
end
# Format a token stream.
def format(tokens, &b)
tokens = enum_for(:filter_escapes, tokens) unless Formatter.escape_enabled?
return stream(tokens, &b) if block_given?
out = String.new('')
stream(tokens) { |piece| out << piece }
out
end
# @deprecated Use {#format} instead.
def render(tokens)
warn 'Formatter#render is deprecated, use #format instead.'
format(tokens)
end
# @abstract
# yield strings that, when concatenated, form the formatted output
def stream(tokens, &b)
raise 'abstract'
end
protected
def token_lines(tokens, &b)
return enum_for(:token_lines, tokens) unless block_given?
out = []
tokens.each do |tok, val|
val.scan %r/\n|[^\n]+/ do |s|
if s == "\n"
yield out
out = []
else
out << [tok, s]
end
end
end
# for inputs not ending in a newline
yield out if out.any?
end
end
end
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