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module CodeRay
module Scanners
# Scanner for C++.
#
# Aliases: +cplusplus+, c++
class CPlusPlus < Scanner
register_for :cpp
file_extension 'cpp'
title 'C++'
#-- http://www.cppreference.com/wiki/keywords/start
KEYWORDS = [
'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',
] # :nodoc:
PREDEFINED_TYPES = [
'bool', 'char', 'double', 'float', 'int', 'long',
'short', 'signed', 'unsigned', 'wchar_t', 'string',
] # :nodoc:
PREDEFINED_CONSTANTS = [
'false', 'true',
'EOF', 'NULL',
] # :nodoc:
PREDEFINED_VARIABLES = [
'this',
] # :nodoc:
DIRECTIVES = [
'auto', 'const', 'explicit', 'extern', 'friend', 'inline', 'mutable', 'operator',
'private', 'protected', 'public', 'register', 'static', 'using', 'virtual', 'void',
'volatile',
] # :nodoc:
IDENT_KIND = WordList.new(:ident).
add(KEYWORDS, :keyword).
add(PREDEFINED_TYPES, :predefined_type).
add(PREDEFINED_VARIABLES, :local_variable).
add(DIRECTIVES, :directive).
add(PREDEFINED_CONSTANTS, :predefined_constant) # :nodoc:
ESCAPE = / [rbfntv\n\\'"] | x[a-fA-F0-9]{1,2} | [0-7]{1,3} /x # :nodoc:
UNICODE_ESCAPE = / u[a-fA-F0-9]{4} | U[a-fA-F0-9]{8} /x # :nodoc:
protected
def scan_tokens encoder, options
state = :initial
label_expected = true
case_expected = false
label_expected_before_preproc_line = nil
in_preproc_line = false
until eos?
case state
when :initial
if match = scan(/ \s+ | \\\n /x)
if in_preproc_line && match != "\\\n" && match.index(?\n)
in_preproc_line = false
label_expected = label_expected_before_preproc_line
end
encoder.text_token match, :space
elsif match = scan(%r! // [^\n\\]* (?: \\. [^\n\\]* )* | /\* (?: .*? \*/ | .* ) !mx)
encoder.text_token match, :comment
elsif match = scan(/ \# \s* if \s* 0 /x)
match << scan_until(/ ^\# (?:elif|else|endif) .*? $ | \z /xm) unless eos?
encoder.text_token match, :comment
elsif match = scan(/ [-+*=<>?:;,!&^|()\[\]{}~%]+ | \/=? | \.(?!\d) /x)
label_expected = match =~ /[;\{\}]/
if case_expected
label_expected = true if match == ':'
case_expected = false
end
encoder.text_token match, :operator
elsif match = scan(/ [A-Za-z_][A-Za-z_0-9]* /x)
kind = IDENT_KIND[match]
if kind == :ident && label_expected && !in_preproc_line && scan(/:(?!:)/)
kind = :label
match << matched
else
label_expected = false
if kind == :keyword
case match
when 'class'
state = :class_name_expected
when 'case', 'default'
case_expected = true
end
end
end
encoder.text_token match, kind
elsif match = scan(/\$/)
encoder.text_token match, :ident
elsif match = scan(/L?"/)
encoder.begin_group :string
if match[0] == ?L
encoder.text_token match, 'L', :modifier
match = '"'
end
state = :string
encoder.text_token match, :delimiter
elsif match = scan(/#[ \t]*(\w*)/)
encoder.text_token match, :preprocessor
in_preproc_line = true
label_expected_before_preproc_line = label_expected
state = :include_expected if self[1] == 'include'
elsif match = scan(/ L?' (?: [^\'\n\\] | \\ #{ESCAPE} )? '? /ox)
label_expected = false
encoder.text_token match, :char
elsif match = scan(/0[xX][0-9A-Fa-f]+/)
label_expected = false
encoder.text_token match, :hex
elsif match = scan(/(?:0[0-7]+)(?![89.eEfF])/)
label_expected = false
encoder.text_token match, :octal
elsif match = scan(/(?:\d+)(?![.eEfF])L?L?/)
label_expected = false
encoder.text_token match, :integer
elsif match = scan(/\d[fF]?|\d*\.\d+(?:[eE][+-]?\d+)?[fF]?|\d+[eE][+-]?\d+[fF]?/)
label_expected = false
encoder.text_token match, :float
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
label_expected = false
elsif match = scan(/ \\ (?: #{ESCAPE} | #{UNICODE_ESCAPE} ) /mox)
encoder.text_token match, :char
elsif match = scan(/ \\ | $ /x)
encoder.end_group :string
encoder.text_token match, :error unless match.empty?
state = :initial
label_expected = false
else
raise_inspect "else case \" reached; %p not handled." % peek(1), encoder
end
when :include_expected
if match = scan(/<[^>\n]+>?|"[^"\n\\]*(?:\\.[^"\n\\]*)*"?/)
encoder.text_token match, :include
state = :initial
elsif match = scan(/\s+/)
encoder.text_token match, :space
state = :initial if match.index ?\n
else
state = :initial
end
when :class_name_expected
if match = scan(/ [A-Za-z_][A-Za-z_0-9]* /x)
encoder.text_token match, :class
state = :initial
elsif match = scan(/\s+/)
encoder.text_token match, :space
else
encoder.text_token getch, :error
state = :initial
end
else
raise_inspect 'Unknown state', encoder
end
end
if state == :string
encoder.end_group :string
end
encoder
end
end
end
end
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