166 lines
4.0 KiB
Ruby
166 lines
4.0 KiB
Ruby
module CodeRay
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module Scanners
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class C < Scanner
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register_for :c
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include Streamable
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RESERVED_WORDS = [
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'asm', 'break', 'case', 'continue', 'default', 'do', 'else',
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'for', 'goto', 'if', 'return', 'switch', 'while',
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'struct', 'union', 'enum', 'typedef',
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'static', 'register', 'auto', 'extern',
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'sizeof',
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'volatile', 'const', # C89
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'inline', 'restrict', # C99
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]
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PREDEFINED_TYPES = [
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'int', 'long', 'short', 'char', 'void',
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'signed', 'unsigned', 'float', 'double',
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'bool', 'complex', # C99
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]
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PREDEFINED_CONSTANTS = [
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'EOF', 'NULL',
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'true', 'false', # C99
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]
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IDENT_KIND = WordList.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 = / [rbfnrtv\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(%r! // [^\n\\]* (?: \\. [^\n\\]* )* | /\* (?: .*? \*/ | .* ) !mx)
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kind = :comment
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elsif match = scan(/ \# \s* if \s* 0 /x)
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match << scan_until(/ ^\# (?:elif|else|endif) .*? $ | \z /xm) unless eos?
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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]
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if kind == :ident and check(/:(?!:)/)
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match << scan(/:/)
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kind = :label
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end
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elsif match = scan(/L?"/)
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tokens << [:open, :string]
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if match[0] == ?L
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tokens << ['L', :modifier]
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match = '"'
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end
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state = :string
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kind = :delimiter
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elsif scan(/#\s*(\w*)/)
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kind = :preprocessor # FIXME multiline preprocs
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state = :include_expected if self[1] == 'include'
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elsif scan(/ L?' (?: [^\'\n\\] | \\ #{ESCAPE} )? '? /ox)
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kind = :char
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elsif scan(/0[xX][0-9A-Fa-f]+/)
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kind = :hex
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elsif scan(/(?:0[0-7]+)(?![89.eEfF])/)
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kind = :oct
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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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when :include_expected
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if scan(/<[^>\n]+>?|"[^"\n\\]*(?:\\.[^"\n\\]*)*"?/)
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kind = :include
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state = :initial
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elsif match = scan(/\s+/)
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kind = :space
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state = :initial if match.index ?\n
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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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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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end
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end
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