c.rb
165 lines
| 4.0 KiB
| text/x-ruby
|
RubyLexer
|
r638 | module CodeRay | ||
module Scanners | ||||
class C < Scanner | ||||
register_for :c | ||||
include Streamable | ||||
RESERVED_WORDS = [ | ||||
'asm', 'break', 'case', 'continue', 'default', 'do', 'else', | ||||
'for', 'goto', 'if', 'return', 'switch', 'while', | ||||
'struct', 'union', 'enum', 'typedef', | ||||
'static', 'register', 'auto', 'extern', | ||||
'sizeof', | ||||
'volatile', 'const', # C89 | ||||
'inline', 'restrict', # C99 | ||||
] | ||||
PREDEFINED_TYPES = [ | ||||
'int', 'long', 'short', 'char', 'void', | ||||
'signed', 'unsigned', 'float', 'double', | ||||
'bool', 'complex', # C99 | ||||
] | ||||
PREDEFINED_CONSTANTS = [ | ||||
'EOF', 'NULL', | ||||
'true', 'false', # C99 | ||||
] | ||||
IDENT_KIND = WordList.new(:ident). | ||||
add(RESERVED_WORDS, :reserved). | ||||
add(PREDEFINED_TYPES, :pre_type). | ||||
add(PREDEFINED_CONSTANTS, :pre_constant) | ||||
ESCAPE = / [rbfnrtv\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(/:(?!:)/) | ||||
match << scan(/:/) | ||||
kind = :label | ||||
end | ||||
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 # FIXME multiline preprocs | ||||
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])/) | ||||
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(/[^\\\n"]+/) | ||||
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 | ||||
getch | ||||
kind = :error | ||||
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 | ||||