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module CodeRay
module Scanners
class CPlusPlus < Scanner
include Streamable
register_for :cpp
file_extension 'cpp'
title 'C++'
# http://www.cppreference.com/wiki/keywords/start
RESERVED_WORDS = [
'and', 'and_eq', 'asm', 'bitand', 'bitor', 'break',
'case', 'catch', 'class', 'compl', 'const_cast',
'continue', 'default', 'delete', 'do', 'dynamic_cast', 'else',
'enum', 'export', 'for', 'goto', 'if', 'namespace', 'new',
'not', 'not_eq', 'or', 'or_eq', 'reinterpret_cast', 'return',
'sizeof', 'static_cast', 'struct', 'switch', 'template',
'throw', 'try', 'typedef', 'typeid', 'typename', 'union',
'while', 'xor', 'xor_eq'
]
PREDEFINED_TYPES = [
'bool', 'char', 'double', 'float', 'int', 'long',
'short', 'signed', 'unsigned', 'wchar_t', 'string'
]
PREDEFINED_CONSTANTS = [
'false', 'true',
'EOF', 'NULL',
]
PREDEFINED_VARIABLES = [
'this'
]
DIRECTIVES = [
'auto', 'const', 'explicit', 'extern', 'friend', 'inline', 'mutable', 'operator',
'private', 'protected', 'public', 'register', 'static', 'using', 'virtual', 'void',
'volatile'
]
IDENT_KIND = WordList.new(:ident).
add(RESERVED_WORDS, :reserved).
add(PREDEFINED_TYPES, :pre_type).
add(PREDEFINED_VARIABLES, :local_variable).
add(DIRECTIVES, :directive).
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(%r! // [^\n\\]* (?: \\. [^\n\\]* )* | /\* (?: .*? \*/ | .* ) !mx)
kind = :comment
elsif match = scan(/ \# \s* if \s* 0 /x)
match << scan_until(/ ^\# (?:elif|else|endif) .*? $ | \z /xm) unless eos?
kind = :comment
elsif scan(/ [-+*=<>?:;,!&^|()\[\]{}~%]+ | \/=? | \.(?!\d) /x)
kind = :operator
elsif match = scan(/ [A-Za-z_][A-Za-z_0-9]* /x)
kind = IDENT_KIND[match]
if kind == :ident and check(/:(?!:)/)
# FIXME: don't match a?b:c
kind = :label
elsif match == 'class'
state = :class_name_expected
end
elsif scan(/\$/)
kind = :ident
elsif match = scan(/L?"/)
tokens << [:open, :string]
if match[0] == ?L
tokens << ['L', :modifier]
match = '"'
end
state = :string
kind = :delimiter
elsif scan(/#\s*(\w*)/)
kind = :preprocessor
state = :include_expected if self[1] == 'include'
elsif scan(/ L?' (?: [^\'\n\\] | \\ #{ESCAPE} )? '? /ox)
kind = :char
elsif scan(/0[xX][0-9A-Fa-f]+/)
kind = :hex
elsif scan(/(?:0[0-7]+)(?![89.eEfF])/)
kind = :oct
elsif scan(/(?:\d+)(?![.eEfF])L?L?/)
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(/[^\\"]+/)
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
when :include_expected
if scan(/<[^>\n]+>?|"[^"\n\\]*(?:\\.[^"\n\\]*)*"?/)
kind = :include
state = :initial
elsif match = scan(/\s+/)
kind = :space
state = :initial if match.index ?\n
else
state = :initial
next
end
when :class_name_expected
if scan(/ [A-Za-z_][A-Za-z_0-9]* /x)
kind = :class
state = :initial
elsif match = scan(/\s+/)
kind = :space
else
getch
kind = :error
state = :initial
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
|
