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module CodeRay
module Scanners
# Scanner for JSON (JavaScript Object Notation).
class JSON < Scanner
include Streamable
register_for :json
file_extension 'json'
KINDS_NOT_LOC = [
:float, :char, :content, :delimiter,
:error, :integer, :operator, :value,
] # :nodoc:
CONSTANTS = %w( true false null ) # :nodoc:
IDENT_KIND = WordList.new(:key).add(CONSTANTS, :value) # :nodoc:
ESCAPE = / [bfnrt\\"\/] /x # :nodoc:
UNICODE_ESCAPE = / u[a-fA-F0-9]{4} /x # :nodoc:
protected
def scan_tokens tokens, options
state = :initial
stack = []
string_delimiter = nil
key_expected = false
until eos?
kind = nil
match = nil
case state
when :initial
if match = scan(/ \s+ | \\\n /x)
tokens << [match, :space]
next
elsif match = scan(/ [:,\[{\]}] /x)
kind = :operator
case match
when '{' then stack << :object; key_expected = true
when '[' then stack << :array
when ':' then key_expected = false
when ',' then key_expected = true if stack.last == :object
when '}', ']' then stack.pop # no error recovery, but works for valid JSON
end
elsif match = scan(/ true | false | null /x)
kind = IDENT_KIND[match]
elsif match = scan(/-?(?:0|[1-9]\d*)/)
kind = :integer
if scan(/\.\d+(?:[eE][-+]?\d+)?|[eE][-+]?\d+/)
match << matched
kind = :float
end
elsif match = scan(/"/)
state = key_expected ? :key : :string
tokens << [:open, state]
kind = :delimiter
else
getch
kind = :error
end
when :string, :key
if scan(/[^\\"]+/)
kind = :content
elsif scan(/"/)
tokens << ['"', :delimiter]
tokens << [:close, state]
state = :initial
next
elsif scan(/ \\ (?: #{ESCAPE} | #{UNICODE_ESCAPE} ) /mox)
kind = :char
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 $CODERAY_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 [:string, :key].include? state
tokens << [:close, state]
end
tokens
end
end
end
end
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