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module CodeRay
module Scanners
# by Andreas Schwarz
class VHDL < Scanner
register_for :vhdl
RESERVED_WORDS = [
'access','after','alias','all','assert','architecture','begin',
'block','body','buffer','bus','case','component','configuration','constant',
'disconnect','downto','else','elsif','end','entity','exit','file','for',
'function','generate','generic','group','guarded','if','impure','in',
'inertial','inout','is','label','library','linkage','literal','loop',
'map','new','next','null','of','on','open','others','out','package',
'port','postponed','procedure','process','pure','range','record','register',
'reject','report','return','select','severity','signal','shared','subtype',
'then','to','transport','type','unaffected','units','until','use','variable',
'wait','when','while','with','note','warning','error','failure','and',
'or','xor','not','nor',
'array'
]
PREDEFINED_TYPES = [
'bit','bit_vector','character','boolean','integer','real','time','string',
'severity_level','positive','natural','signed','unsigned','line','text',
'std_logic','std_logic_vector','std_ulogic','std_ulogic_vector','qsim_state',
'qsim_state_vector','qsim_12state','qsim_12state_vector','qsim_strength',
'mux_bit','mux_vector','reg_bit','reg_vector','wor_bit','wor_vector'
]
PREDEFINED_CONSTANTS = [
]
IDENT_KIND = CaseIgnoringWordList.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(/-- .*/x)
kind = :comment
elsif scan(/ [-+*\/=<>?:;,!&^|()\[\]{}~%]+ | \.(?!\d) /x)
kind = :operator
elsif match = scan(/ [A-Za-z_][A-Za-z_0-9]* /x)
kind = IDENT_KIND[match.downcase]
elsif match = scan(/[a-z]?"/i)
tokens << [:open, :string]
state = :string
kind = :delimiter
elsif scan(/ L?' (?: [^\'\n\\] | \\ #{ESCAPE} )? '? /ox)
kind = :char
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
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