127 lines
3.4 KiB
Ruby
127 lines
3.4 KiB
Ruby
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class VHDL < CodeRay::Scanners::Scanner
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register_for :vhdl
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RESERVED_WORDS = [
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'access','after','alias','all','assert','architecture','begin',
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'block','body','buffer','bus','case','component','configuration','constant',
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'disconnect','downto','else','elsif','end','entity','exit','file','for',
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'function','generate','generic','group','guarded','if','impure','in',
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'inertial','inout','is','label','library','linkage','literal','loop',
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'map','new','next','null','of','on','open','others','out','package',
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'port','postponed','procedure','process','pure','range','record','register',
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'reject','report','return','select','severity','signal','shared','subtype',
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'then','to','transport','type','unaffected','units','until','use','variable',
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'wait','when','while','with','note','warning','error','failure','and',
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'or','xor','not','nor',
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'array'
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]
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PREDEFINED_TYPES = [
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'bit','bit_vector','character','boolean','integer','real','time','string',
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'severity_level','positive','natural','signed','unsigned','line','text',
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'std_logic','std_logic_vector','std_ulogic','std_ulogic_vector','qsim_state',
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'qsim_state_vector','qsim_12state','qsim_12state_vector','qsim_strength',
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'mux_bit','mux_vector','reg_bit','reg_vector','wor_bit','wor_vector'
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]
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PREDEFINED_CONSTANTS = [
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]
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IDENT_KIND = CodeRay::CaseIgnoringWordList.new(:ident).
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add(RESERVED_WORDS, :reserved).
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add(PREDEFINED_TYPES, :pre_type).
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add(PREDEFINED_CONSTANTS, :pre_constant)
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ESCAPE = / [rbfntv\n\\'"] | x[a-fA-F0-9]{1,2} | [0-7]{1,3} /x
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UNICODE_ESCAPE = / u[a-fA-F0-9]{4} | U[a-fA-F0-9]{8} /x
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def scan_tokens tokens, options
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state = :initial
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until eos?
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kind = nil
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match = nil
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case state
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when :initial
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if scan(/ \s+ | \\\n /x)
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kind = :space
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elsif scan(/-- .*/x)
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kind = :comment
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elsif scan(/ [-+*\/=<>?:;,!&^|()\[\]{}~%]+ | \.(?!\d) /x)
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kind = :operator
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elsif match = scan(/ [A-Za-z_][A-Za-z_0-9]* /x)
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kind = IDENT_KIND[match.downcase]
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elsif match = scan(/[a-z]?"/i)
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tokens << [:open, :string]
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state = :string
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kind = :delimiter
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elsif scan(/ L?' (?: [^\'\n\\] | \\ #{ESCAPE} )? '? /ox)
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kind = :char
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elsif scan(/(?:\d+)(?![.eEfF])/)
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kind = :integer
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elsif scan(/\d[fF]?|\d*\.\d+(?:[eE][+-]?\d+)?[fF]?|\d+[eE][+-]?\d+[fF]?/)
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kind = :float
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else
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getch
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kind = :error
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end
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when :string
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if scan(/[^\\\n"]+/)
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kind = :content
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elsif scan(/"/)
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tokens << ['"', :delimiter]
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tokens << [:close, :string]
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state = :initial
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next
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elsif scan(/ \\ (?: #{ESCAPE} | #{UNICODE_ESCAPE} ) /mox)
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kind = :char
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elsif scan(/ \\ | $ /x)
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tokens << [:close, :string]
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kind = :error
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state = :initial
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else
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raise_inspect "else case \" reached; %p not handled." % peek(1), tokens
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end
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else
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raise_inspect 'Unknown state', tokens
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end
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match ||= matched
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if $DEBUG and not kind
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raise_inspect 'Error token %p in line %d' %
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[[match, kind], line], tokens
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end
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raise_inspect 'Empty token', tokens unless match
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tokens << [match, kind]
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end
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if state == :string
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tokens << [:close, :string]
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end
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tokens
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end
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end
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