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##
# Collection of methods for writing parsers against RDoc::RubyLex and
# RDoc::RubyToken
module RDoc::Parser::RubyTools
include RDoc::RubyToken
##
# Adds a token listener +obj+, but you should probably use token_listener
def add_token_listener(obj)
@token_listeners ||= []
@token_listeners << obj
end
##
# Fetches the next token from the scanner
def get_tk
tk = nil
if @tokens.empty? then
tk = @scanner.token
@read.push @scanner.get_readed
puts "get_tk1 => #{tk.inspect}" if $TOKEN_DEBUG
else
@read.push @unget_read.shift
tk = @tokens.shift
puts "get_tk2 => #{tk.inspect}" if $TOKEN_DEBUG
end
tk = nil if TkEND_OF_SCRIPT === tk
if TkSYMBEG === tk then
set_token_position tk.line_no, tk.char_no
case tk1 = get_tk
when TkId, TkOp, TkSTRING, TkDSTRING, TkSTAR, TkAMPER then
if tk1.respond_to?(:name) then
tk = Token(TkSYMBOL).set_text(":" + tk1.name)
else
tk = Token(TkSYMBOL).set_text(":" + tk1.text)
end
# remove the identifier we just read (we're about to replace it with a
# symbol)
@token_listeners.each do |obj|
obj.pop_token
end if @token_listeners
else
tk = tk1
end
end
# inform any listeners of our shiny new token
@token_listeners.each do |obj|
obj.add_token(tk)
end if @token_listeners
tk
end
##
# Reads and returns all tokens up to one of +tokens+. Leaves the matched
# token in the token list.
def get_tk_until(*tokens)
read = []
loop do
tk = get_tk
case tk when *tokens then unget_tk tk; break end
read << tk
end
read
end
##
# Retrieves a String representation of the read tokens
def get_tkread
read = @read.join("")
@read = []
read
end
##
# Peek equivalent for get_tkread
def peek_read
@read.join('')
end
##
# Peek at the next token, but don't remove it from the stream
def peek_tk
unget_tk(tk = get_tk)
tk
end
##
# Removes the token listener +obj+
def remove_token_listener(obj)
@token_listeners.delete(obj)
end
##
# Resets the tools
def reset
@read = []
@tokens = []
@unget_read = []
@nest = 0
end
##
# Skips whitespace tokens including newlines if +skip_nl+ is true
def skip_tkspace(skip_nl = true) # HACK dup
tokens = []
while TkSPACE === (tk = get_tk) or (skip_nl and TkNL === tk) do
tokens.push tk
end
unget_tk tk
tokens
end
##
# Has +obj+ listen to tokens
def token_listener(obj)
add_token_listener obj
yield
ensure
remove_token_listener obj
end
##
# Returns +tk+ to the scanner
def unget_tk(tk)
@tokens.unshift tk
@unget_read.unshift @read.pop
# Remove this token from any listeners
@token_listeners.each do |obj|
obj.pop_token
end if @token_listeners
end
end
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