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module CodeRay
module Scanners
# Scheme scanner for CodeRay (by closure).
# Thanks to murphy for putting CodeRay into public.
class Scheme < Scanner
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
]
IDENT_KIND = CaseIgnoringWordList.new(:ident).
add(CORE_FORMS, :reserved)
#IDENTIFIER_INITIAL = /[a-z!@\$%&\*\/\:<=>\?~_\^]/i
#IDENTIFIER_SUBSEQUENT = /#{IDENTIFIER_INITIAL}|\d|\.|\+|-/
#IDENTIFIER = /#{IDENTIFIER_INITIAL}#{IDENTIFIER_SUBSEQUENT}*|\+|-|\.{3}/
IDENTIFIER = /[a-zA-Z!@$%&*\/:<=>?~_^][\w!@$%&*\/:<=>?~^.+\-]*|[+-]|\.\.\./
DIGIT = /\d/
DIGIT10 = DIGIT
DIGIT16 = /[0-9a-f]/i
DIGIT8 = /[0-7]/
DIGIT2 = /[01]/
RADIX16 = /\#x/i
RADIX8 = /\#o/i
RADIX2 = /\#b/i
RADIX10 = /\#d/i
EXACTNESS = /#i|#e/i
SIGN = /[\+-]?/
EXP_MARK = /[esfdl]/i
EXP = /#{EXP_MARK}#{SIGN}#{DIGIT}+/
SUFFIX = /#{EXP}?/
PREFIX10 = /#{RADIX10}?#{EXACTNESS}?|#{EXACTNESS}?#{RADIX10}?/
PREFIX16 = /#{RADIX16}#{EXACTNESS}?|#{EXACTNESS}?#{RADIX16}/
PREFIX8 = /#{RADIX8}#{EXACTNESS}?|#{EXACTNESS}?#{RADIX8}/
PREFIX2 = /#{RADIX2}#{EXACTNESS}?|#{EXACTNESS}?#{RADIX2}/
UINT10 = /#{DIGIT10}+#*/
UINT16 = /#{DIGIT16}+#*/
UINT8 = /#{DIGIT8}+#*/
UINT2 = /#{DIGIT2}+#*/
DECIMAL = /#{DIGIT10}+#+\.#*#{SUFFIX}|#{DIGIT10}+\.#{DIGIT10}*#*#{SUFFIX}|\.#{DIGIT10}+#*#{SUFFIX}|#{UINT10}#{EXP}/
UREAL10 = /#{UINT10}\/#{UINT10}|#{DECIMAL}|#{UINT10}/
UREAL16 = /#{UINT16}\/#{UINT16}|#{UINT16}/
UREAL8 = /#{UINT8}\/#{UINT8}|#{UINT8}/
UREAL2 = /#{UINT2}\/#{UINT2}|#{UINT2}/
REAL10 = /#{SIGN}#{UREAL10}/
REAL16 = /#{SIGN}#{UREAL16}/
REAL8 = /#{SIGN}#{UREAL8}/
REAL2 = /#{SIGN}#{UREAL2}/
IMAG10 = /i|#{UREAL10}i/
IMAG16 = /i|#{UREAL16}i/
IMAG8 = /i|#{UREAL8}i/
IMAG2 = /i|#{UREAL2}i/
COMPLEX10 = /#{REAL10}@#{REAL10}|#{REAL10}\+#{IMAG10}|#{REAL10}-#{IMAG10}|\+#{IMAG10}|-#{IMAG10}|#{REAL10}/
COMPLEX16 = /#{REAL16}@#{REAL16}|#{REAL16}\+#{IMAG16}|#{REAL16}-#{IMAG16}|\+#{IMAG16}|-#{IMAG16}|#{REAL16}/
COMPLEX8 = /#{REAL8}@#{REAL8}|#{REAL8}\+#{IMAG8}|#{REAL8}-#{IMAG8}|\+#{IMAG8}|-#{IMAG8}|#{REAL8}/
COMPLEX2 = /#{REAL2}@#{REAL2}|#{REAL2}\+#{IMAG2}|#{REAL2}-#{IMAG2}|\+#{IMAG2}|-#{IMAG2}|#{REAL2}/
NUM10 = /#{PREFIX10}?#{COMPLEX10}/
NUM16 = /#{PREFIX16}#{COMPLEX16}/
NUM8 = /#{PREFIX8}#{COMPLEX8}/
NUM2 = /#{PREFIX2}#{COMPLEX2}/
NUM = /#{NUM10}|#{NUM16}|#{NUM8}|#{NUM2}/
private
def scan_tokens tokens,options
state = :initial
ident_kind = IDENT_KIND
until eos?
kind = match = nil
case state
when :initial
if scan(/ \s+ | \\\n /x)
kind = :space
elsif scan(/['\(\[\)\]]|#\(/)
kind = :operator_fat
elsif scan(/;.*/)
kind = :comment
elsif scan(/#\\(?:newline|space|.?)/)
kind = :char
elsif scan(/#[ft]/)
kind = :pre_constant
elsif scan(/#{IDENTIFIER}/o)
kind = ident_kind[matched]
elsif scan(/\./)
kind = :operator
elsif scan(/"/)
tokens << [:open, :string]
state = :string
tokens << ['"', :delimiter]
next
elsif scan(/#{NUM}/o) and not matched.empty?
kind = :integer
elsif getch
kind = :error
end
when :string
if scan(/[^"\\]+/) or scan(/\\.?/)
kind = :content
elsif scan(/"/)
tokens << ['"', :delimiter]
tokens << [:close, :string]
state = :initial
next
else
raise_inspect "else case \" reached; %p not handled." % peek(1),
tokens, state
end
else
raise "else case reached"
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, state unless match
tokens << [match, kind]
end # until eos
if state == :string
tokens << [:close, :string]
end
tokens
end #scan_tokens
end #class
end #module scanners
end #module coderay
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