113 lines
2.9 KiB
Ruby
113 lines
2.9 KiB
Ruby
module CodeRay
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module Scanners
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class JSON < Scanner
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include Streamable
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register_for :json
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file_extension 'json'
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KINDS_NOT_LOC = [
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:float, :char, :content, :delimiter,
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:error, :integer, :operator, :value,
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]
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CONSTANTS = %w( true false null )
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IDENT_KIND = WordList.new(:key).add(CONSTANTS, :value)
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ESCAPE = / [bfnrt\\"\/] /x
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UNICODE_ESCAPE = / u[a-fA-F0-9]{4} /x
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def scan_tokens tokens, options
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state = :initial
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stack = []
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string_delimiter = nil
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key_expected = false
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until eos?
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kind = nil
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match = nil
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case state
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when :initial
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if match = scan(/ \s+ | \\\n /x)
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tokens << [match, :space]
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next
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elsif match = scan(/ [:,\[{\]}] /x)
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kind = :operator
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case match
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when '{' then stack << :object; key_expected = true
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when '[' then stack << :array
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when ':' then key_expected = false
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when ',' then key_expected = true if stack.last == :object
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when '}', ']' then stack.pop # no error recovery, but works for valid JSON
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end
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elsif match = scan(/ true | false | null /x)
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kind = IDENT_KIND[match]
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elsif match = scan(/-?(?:0|[1-9]\d*)/)
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kind = :integer
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if scan(/\.\d+(?:[eE][-+]?\d+)?|[eE][-+]?\d+/)
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match << matched
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kind = :float
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end
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elsif match = scan(/"/)
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state = key_expected ? :key : :string
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tokens << [:open, state]
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kind = :delimiter
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else
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getch
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kind = :error
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end
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when :string, :key
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if scan(/[^\\"]+/)
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kind = :content
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elsif scan(/"/)
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tokens << ['"', :delimiter]
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tokens << [:close, state]
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state = :initial
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next
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elsif scan(/ \\ (?: #{ESCAPE} | #{UNICODE_ESCAPE} ) /mox)
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kind = :char
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elsif scan(/\\./m)
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kind = :content
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elsif scan(/ \\ | $ /x)
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tokens << [:close, :delimiter]
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kind = :error
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state = :initial
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else
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raise_inspect "else case \" reached; %p not handled." % peek(1), tokens
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end
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else
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raise_inspect 'Unknown state', tokens
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end
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match ||= matched
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if $CODERAY_DEBUG and not kind
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raise_inspect 'Error token %p in line %d' %
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[[match, kind], line], tokens
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end
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raise_inspect 'Empty token', tokens unless match
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tokens << [match, kind]
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end
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if [:string, :key].include? state
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tokens << [:close, state]
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end
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tokens
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end
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end
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end
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end
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