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module CodeRay
module Scanners
class Java < Scanner
include Streamable
register_for :java
helper :builtin_types
# http://java.sun.com/docs/books/tutorial/java/nutsandbolts/_keywords.html
KEYWORDS = %w[
assert break case catch continue default do else
finally for if instanceof import new package
return switch throw try typeof while
debugger export
]
RESERVED = %w[ const goto ]
CONSTANTS = %w[ false null true ]
MAGIC_VARIABLES = %w[ this super ]
TYPES = %w[
boolean byte char class double enum float int interface long
short void
] << '[]' # String[] should be highlighted as a type
DIRECTIVES = %w[
abstract extends final implements native private protected public
static strictfp synchronized throws transient volatile
]
IDENT_KIND = WordList.new(:ident).
add(KEYWORDS, :keyword).
add(RESERVED, :reserved).
add(CONSTANTS, :pre_constant).
add(MAGIC_VARIABLES, :local_variable).
add(TYPES, :type).
add(BuiltinTypes::List, :pre_type).
add(BuiltinTypes::List.select { |builtin| builtin[/(Error|Exception)$/] }, :exception).
add(DIRECTIVES, :directive)
ESCAPE = / [bfnrtv\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
STRING_CONTENT_PATTERN = {
"'" => /[^\\']+/,
'"' => /[^\\"]+/,
'/' => /[^\\\/]+/,
}
IDENT = /[a-zA-Z_][A-Za-z_0-9]*/
def scan_tokens tokens, options
state = :initial
string_delimiter = nil
import_clause = class_name_follows = last_token_dot = false
until eos?
kind = nil
match = nil
case state
when :initial
if match = scan(/ \s+ | \\\n /x)
tokens << [match, :space]
next
elsif match = scan(%r! // [^\n\\]* (?: \\. [^\n\\]* )* | /\* (?: .*? \*/ | .* ) !mx)
tokens << [match, :comment]
next
elsif import_clause && scan(/ #{IDENT} (?: \. #{IDENT} )* /ox)
kind = :include
elsif match = scan(/ #{IDENT} | \[\] /ox)
kind = IDENT_KIND[match]
if last_token_dot
kind = :ident
elsif class_name_follows
kind = :class
class_name_follows = false
else
import_clause = true if match == 'import'
class_name_follows = true if match == 'class' || match == 'interface'
end
elsif scan(/ \.(?!\d) | [,?:()\[\]}] | -- | \+\+ | && | \|\| | \*\*=? | [-+*\/%^~&|<>=!]=? | <<<?=? | >>>?=? /x)
kind = :operator
elsif scan(/;/)
import_clause = false
kind = :operator
elsif scan(/\{/)
class_name_follows = false
kind = :operator
elsif check(/[\d.]/)
if scan(/0[xX][0-9A-Fa-f]+/)
kind = :hex
elsif scan(/(?>0[0-7]+)(?![89.eEfF])/)
kind = :oct
elsif scan(/\d+[fFdD]|\d*\.\d+(?:[eE][+-]?\d+)?[fFdD]?|\d+[eE][+-]?\d+[fFdD]?/)
kind = :float
elsif scan(/\d+[lL]?/)
kind = :integer
end
elsif match = scan(/["']/)
tokens << [:open, :string]
state = :string
string_delimiter = match
kind = :delimiter
elsif scan(/ @ #{IDENT} /ox)
kind = :annotation
else
getch
kind = :error
end
when :string
if scan(STRING_CONTENT_PATTERN[string_delimiter])
kind = :content
elsif match = scan(/["'\/]/)
tokens << [match, :delimiter]
tokens << [:close, state]
string_delimiter = nil
state = :initial
next
elsif state == :string && (match = scan(/ \\ (?: #{ESCAPE} | #{UNICODE_ESCAPE} ) /mox))
if string_delimiter == "'" && !(match == "\\\\" || match == "\\'")
kind = :content
else
kind = :char
end
elsif scan(/\\./m)
kind = :content
elsif scan(/ \\ | $ /x)
tokens << [:close, :delimiter]
kind = :error
state = :initial
else
raise_inspect "else case \" reached; %p not handled." % peek(1), tokens
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
last_token_dot = match == '.'
tokens << [match, kind]
end
if state == :string
tokens << [:close, state]
end
tokens
end
end
end
end
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