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##
# 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
# elements. The following tokens types are wrapped in spans
# with the given class names:
#
# TkCONSTANT :: 'ruby-constant'
# TkKW :: 'ruby-keyword'
# TkIVAR :: 'ruby-ivar'
# TkOp :: 'ruby-operator'
# TkId :: 'ruby-identifier'
# TkNode :: 'ruby-node'
# TkCOMMENT :: 'ruby-comment'
# TkREGEXP :: 'ruby-regexp'
# TkSTRING :: 'ruby-string'
# TkVal :: 'ruby-value'
#
# Other token types are not wrapped in spans.
def self.to_html token_stream
token_stream.map do |t|
next unless t
style = case t
when RDoc::RubyToken::TkCONSTANT then 'ruby-constant'
when RDoc::RubyToken::TkKW then 'ruby-keyword'
when RDoc::RubyToken::TkIVAR then 'ruby-ivar'
when RDoc::RubyToken::TkOp then 'ruby-operator'
when RDoc::RubyToken::TkId then 'ruby-identifier'
when RDoc::RubyToken::TkNode then 'ruby-node'
when RDoc::RubyToken::TkCOMMENT then 'ruby-comment'
when RDoc::RubyToken::TkREGEXP then 'ruby-regexp'
when RDoc::RubyToken::TkSTRING then 'ruby-string'
when RDoc::RubyToken::TkVal then 'ruby-value'
end
text = CGI.escapeHTML t.text
if style then
"#{text}"
else
text
end
end.join
end
##
# Adds +tokens+ to the collected tokens
def add_tokens(*tokens)
tokens.flatten.each { |token| @token_stream << token }
end
alias add_token add_tokens
##
# 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.map { |token| token.text }.join ''
end
end