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# frozen_string_literal: true
##
# A TokenStream is a list of tokens, gathered during the parse of some entity
# (say a method). Entities populate these streams by being registered with the
# lexer. Any class can collect tokens by including TokenStream. From the
# outside, you use such an object by calling the start_collecting_tokens
# method, followed by calls to add_token and pop_token.
module RDoc::TokenStream
##
# Converts +token_stream+ to HTML wrapping various tokens with
# <tt><span></tt> elements. Some tokens types are wrapped in spans
# with the given class names. Other token types are not wrapped in spans.
def self.to_html token_stream
starting_title = false
token_stream.map do |t|
next unless t
style = case t[:kind]
when :on_const then 'ruby-constant'
when :on_kw then 'ruby-keyword'
when :on_ivar then 'ruby-ivar'
when :on_cvar then 'ruby-identifier'
when :on_gvar then 'ruby-identifier'
when '=' != t[:text] && :on_op
then 'ruby-operator'
when :on_tlambda then 'ruby-operator'
when :on_ident then 'ruby-identifier'
when :on_label then 'ruby-value'
when :on_backref, :on_dstring
then 'ruby-node'
when :on_comment then 'ruby-comment'
when :on_embdoc then 'ruby-comment'
when :on_regexp then 'ruby-regexp'
when :on_tstring then 'ruby-string'
when :on_int, :on_float,
:on_rational, :on_imaginary,
:on_heredoc,
:on_symbol, :on_CHAR then 'ruby-value'
when :on_heredoc_beg, :on_heredoc_end
then 'ruby-identifier'
end
comment_with_nl = false
if :on_comment == t[:kind] or :on_embdoc == t[:kind] or :on_heredoc_end == t[:kind]
comment_with_nl = true if "\n" == t[:text][-1]
text = t[:text].rstrip
else
text = t[:text]
end
if :on_ident == t[:kind] && starting_title
starting_title = false
style = 'ruby-identifier ruby-title'
end
if :on_kw == t[:kind] and 'def' == t[:text]
starting_title = true
end
text = CGI.escapeHTML text
if style then
"<span class=\"#{style}\">#{text}</span>#{"\n" if comment_with_nl}"
else
text
end
end.join
end
##
# Adds +tokens+ to the collected tokens
def add_tokens(tokens)
@token_stream.concat(tokens)
end
##
# Adds one +token+ to the collected tokens
def add_token(token)
@token_stream.push(token)
end
##
# Starts collecting tokens
def collect_tokens
@token_stream = []
end
alias start_collecting_tokens collect_tokens
##
# Remove the last token from the collected tokens
def pop_token
@token_stream.pop
end
##
# Current token stream
def token_stream
@token_stream
end
##
# Returns a string representation of the token stream
def tokens_to_s
token_stream.compact.map { |token| token[:text] }.join ''
end
end