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module CodeRay
module Scanners
# by Eric Thomas
class Tcl < Scanner
register_for :tcl
# Taken from http://www.xilinx.com/itp/xilinx10/isehelp/ite_r_tcl_reserved_words.htm
RESERVED_WORDS = %w(after append array auto_execok auto_import auto_load
auto_load_index auto_qualify binary bgerrro break
catch cd clock close concat continue dde default
else elseif encoding eof error eval exec exit expr
fblocked fconfigure fcopy file fileevent flush for
foreach format gets glob global history if incr
interp join lappend lindex list llength load lrange
lrange lreplace lsearch lsort namespace open package
pid pkg_mkIndex proc puts pwd read regexp regsub
rename resource return scan seek set socket source
split string subst switch tclLog tell time trace
unknown unset update uplevel upvar vwait while)
PREDEFINED_TYPES = %w(variable)
# should we include 0 or 1?
PREDEFINED_CONSTANTS = %w(true false yes no on off 1 0)
IDENT_KIND = WordList.new(:ident).
add(RESERVED_WORDS, :reserved).
add(PREDEFINED_TYPES, :pre_type).
add(PREDEFINED_CONSTANTS, :pre_constant)
ESCAPE = / [rbfntv\n\\'"] | x[a-fA-F0-9]{1,2} | [0-7]{1,3} /x
UNICODE_ESCAPE = / u[a-fA-F0-9]{4} | U[a-fA-F0-9]{8} /x
def scan_tokens tokens, options
state = :initial
until eos?
kind = nil
match = nil
case state
when :initial
if scan(/ \s+ | \\\n /x)
kind = :space
elsif scan(/#.*/)
kind = :comment
elsif scan(/ [-+*\/=<>?:;,!&^|()\[\]{}~%]+ | \.(?!\d) /x)
kind = :operator
elsif scan(/\$\S+/)
kind = :variable
elsif match = scan(/ [A-Za-z_][A-Za-z_0-9]* /x)
kind = IDENT_KIND[match]
if kind == :ident and check(/:(?!:)/)
match << scan(/:/)
kind = :label
end
elsif match = scan(/L?"/)
tokens << [:open, :string]
if match[0] == ?L
tokens << ['L', :modifier]
match = '"'
end
state = :string
kind = :delimiter
elsif scan(/ L?' (?: [^\'\n\\] | \\ #{ESCAPE} )? '? /ox)
kind = :char
elsif scan(/0[xX][0-9A-Fa-f]+/)
kind = :hex
elsif scan(/(?:0[0-7]+)(?![89.eEfF])/)
kind = :oct
elsif scan(/(?:\d+)(?![.eEfF])/)
kind = :integer
elsif scan(/\d[fF]?|\d*\.\d+(?:[eE][+-]?\d+)?[fF]?|\d+[eE][+-]?\d+[fF]?/)
kind = :float
else
getch
kind = :error
end
when :string
if scan(/[^\\\n"]+/)
kind = :content
elsif scan(/"/)
tokens << ['"', :delimiter]
tokens << [:close, :string]
state = :initial
next
elsif scan(/ \\ (?: #{ESCAPE} | #{UNICODE_ESCAPE} ) /mox)
kind = :char
elsif scan(/ \\ | $ /x)
tokens << [:close, :string]
kind = :error
state = :initial
else
raise_inspect "else case \" reached; %p not handled." % peek(1), tokens
end
else
raise_inspect 'Unknown state', tokens
end
match ||= matched
if $DEBUG and not kind
raise_inspect 'Error token %p in line %d' %
[[match, kind], line], tokens
end
raise_inspect 'Empty token', tokens unless match
tokens << [match, kind]
end
if state == :string
tokens << [:close, :string]
end
tokens
end
end
end
end
|
