diff options
Diffstat (limited to 'etc/todo')
| -rw-r--r-- | etc/todo/scanners/scheme.rb | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/etc/todo/scanners/scheme.rb b/etc/todo/scanners/scheme.rb new file mode 100644 index 0000000..59595cd --- /dev/null +++ b/etc/todo/scanners/scheme.rb @@ -0,0 +1,136 @@ +module CodeRay + module Scanners + + # Scheme scanner for CodeRay (by closure). + # + # Thanks to murphy for putting CodeRay into public. + class Scheme < Scanner + + # TODO: function defs + # TODO: built-in functions + + register_for :scheme + file_extension 'scm' + + CORE_FORMS = %w[ + lambda let let* letrec syntax-case define-syntax let-syntax + letrec-syntax begin define quote if or and cond case do delay + quasiquote set! cons force call-with-current-continuation call/cc + ] # :nodoc: + + IDENT_KIND = CaseIgnoringWordList.new(:ident). + add(CORE_FORMS, :keyword) # :nodoc: + + #IDENTIFIER_INITIAL = /[a-z!@\$%&\*\/\:<=>\?~_\^]/i + #IDENTIFIER_SUBSEQUENT = /#{IDENTIFIER_INITIAL}|\d|\.|\+|-/ + #IDENTIFIER = /#{IDENTIFIER_INITIAL}#{IDENTIFIER_SUBSEQUENT}*|\+|-|\.{3}/ + IDENTIFIER = /[a-zA-Z!@$%&*\/:<=>?~_^][\w!@$%&*\/:<=>?~^.+\-]*|[+-]|\.\.\./ # :nodoc: + DIGIT = /\d/ # :nodoc: + DIGIT10 = /\d/ # :nodoc: + DIGIT16 = /[0-9a-f]/i # :nodoc: + DIGIT8 = /[0-7]/ # :nodoc: + DIGIT2 = /[01]/ # :nodoc: + RADIX16 = /\#x/i # :nodoc: + RADIX8 = /\#o/i # :nodoc: + RADIX2 = /\#b/i # :nodoc: + RADIX10 = /\#d/i # :nodoc: + EXACTNESS = /#i|#e/i # :nodoc: + SIGN = /[\+-]?/ # :nodoc: + EXP_MARK = /[esfdl]/i # :nodoc: + EXP = /#{EXP_MARK}#{SIGN}#{DIGIT}+/ # :nodoc: + SUFFIX = /#{EXP}?/ # :nodoc: + PREFIX10 = /#{RADIX10}?#{EXACTNESS}?|#{EXACTNESS}?#{RADIX10}?/ # :nodoc: + PREFIX16 = /#{RADIX16}#{EXACTNESS}?|#{EXACTNESS}?#{RADIX16}/ # :nodoc: + PREFIX8 = /#{RADIX8}#{EXACTNESS}?|#{EXACTNESS}?#{RADIX8}/ # :nodoc: + PREFIX2 = /#{RADIX2}#{EXACTNESS}?|#{EXACTNESS}?#{RADIX2}/ # :nodoc: + UINT10 = /#{DIGIT10}+#*/ # :nodoc: + UINT16 = /#{DIGIT16}+#*/ # :nodoc: + UINT8 = /#{DIGIT8}+#*/ # :nodoc: + UINT2 = /#{DIGIT2}+#*/ # :nodoc: + DECIMAL = /#{DIGIT10}+#+\.#*#{SUFFIX}|#{DIGIT10}+\.#{DIGIT10}*#*#{SUFFIX}|\.#{DIGIT10}+#*#{SUFFIX}|#{UINT10}#{EXP}/ # :nodoc: + UREAL10 = /#{UINT10}\/#{UINT10}|#{DECIMAL}|#{UINT10}/ # :nodoc: + UREAL16 = /#{UINT16}\/#{UINT16}|#{UINT16}/ # :nodoc: + UREAL8 = /#{UINT8}\/#{UINT8}|#{UINT8}/ # :nodoc: + UREAL2 = /#{UINT2}\/#{UINT2}|#{UINT2}/ # :nodoc: + REAL10 = /#{SIGN}#{UREAL10}/ # :nodoc: + REAL16 = /#{SIGN}#{UREAL16}/ # :nodoc: + REAL8 = /#{SIGN}#{UREAL8}/ # :nodoc: + REAL2 = /#{SIGN}#{UREAL2}/ # :nodoc: + IMAG10 = /i|#{UREAL10}i/ # :nodoc: + IMAG16 = /i|#{UREAL16}i/ # :nodoc: + IMAG8 = /i|#{UREAL8}i/ # :nodoc: + IMAG2 = /i|#{UREAL2}i/ # :nodoc: + COMPLEX10 = /#{REAL10}@#{REAL10}|#{REAL10}\+#{IMAG10}|#{REAL10}-#{IMAG10}|\+#{IMAG10}|-#{IMAG10}|#{REAL10}/ # :nodoc: + COMPLEX16 = /#{REAL16}@#{REAL16}|#{REAL16}\+#{IMAG16}|#{REAL16}-#{IMAG16}|\+#{IMAG16}|-#{IMAG16}|#{REAL16}/ # :nodoc: + COMPLEX8 = /#{REAL8}@#{REAL8}|#{REAL8}\+#{IMAG8}|#{REAL8}-#{IMAG8}|\+#{IMAG8}|-#{IMAG8}|#{REAL8}/ # :nodoc: + COMPLEX2 = /#{REAL2}@#{REAL2}|#{REAL2}\+#{IMAG2}|#{REAL2}-#{IMAG2}|\+#{IMAG2}|-#{IMAG2}|#{REAL2}/ # :nodoc: + NUM10 = /#{PREFIX10}?#{COMPLEX10}/ # :nodoc: + NUM16 = /#{PREFIX16}#{COMPLEX16}/ # :nodoc: + NUM8 = /#{PREFIX8}#{COMPLEX8}/ # :nodoc: + NUM2 = /#{PREFIX2}#{COMPLEX2}/ # :nodoc: + NUM = /#{NUM10}|#{NUM16}|#{NUM8}|#{NUM2}/ # :nodoc: + + protected + + def scan_tokens encoder, options + + state = :initial + ident_kind = IDENT_KIND + + until eos? + + case state + when :initial + if match = scan(/ \s+ | \\\n /x) + encoder.text_token match, :space + elsif match = scan(/['\(\[\)\]]|#\(/) + encoder.text_token match, :operator + elsif match = scan(/;.*/) + encoder.text_token match, :comment + elsif match = scan(/#\\(?:newline|space|.?)/) + encoder.text_token match, :char + elsif match = scan(/#[ft]/) + encoder.text_token match, :predefined_constant + elsif match = scan(/#{IDENTIFIER}/o) + encoder.text_token match, ident_kind[matched] + elsif match = scan(/\./) + encoder.text_token match, :operator + elsif match = scan(/"/) + encoder.begin_group :string + encoder.text_token match, :delimiter + state = :string + elsif match = scan(/#{NUM}/o) and not matched.empty? + encoder.text_token match, :integer + else + encoder.text_token getch, :error + end + + when :string + if match = scan(/[^"\\]+|\\.?/) + encoder.text_token match, :content + elsif match = scan(/"/) + encoder.text_token match, :delimiter + encoder.end_group :string + state = :initial + else + raise_inspect "else case \" reached; %p not handled." % peek(1), + encoder, state + end + + else + raise 'else case reached' + + end + + end + + if state == :string + encoder.end_group state + end + + encoder + + end + end + end +end
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