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Versions: 14
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Contents
require 'antlr4/runtime/char_stream'
module Antlr4::Runtime
class CodePointCharStream < CharStream
def initialize(position, remaining, name, byte_array)
@size = remaining
@name = name
@position = position
@byte_array = byte_array
end
def text(interval)
start_idx = [interval.a, @size].min
len = [interval.b - interval.a + 1, @size - start_idx].min
# We know the maximum code point in byte_array is U+00FF,
# so we can treat this as if it were ISO-8859-1, aka Latin-1,
# which shares the same code points up to 0xFF.
chars = @byte_array.slice(start_idx, len)
result = ''
chars.each do |c|
result << c
end
result
end
def la(i)
case Integer.signum(i)
when -1
offset = @position + i
return IntStream::EOF if offset < 0
return @byte_array[offset] & 0xFF
when 0
# Undefined
return 0
when 1
offset = @position + i - 1
return IntStream::EOF if offset >= @size
return @byte_array[offset] & 0xFF
else
# type code here
end
raise UnsupportedOperationException, 'Not reached'
end
def internal_storage
@byte_array
end
def consume
raise IllegalStateException, 'cannot consume EOF' if (@size - @position).zero?
@position += 1
end
def index
@position
end
attr_reader :size
def mark
-1
end
def release(marker)
;
end
def seek(index)
@position = index
end
def source_name
return UNKNOWN_SOURCE_NAME if @name.nil? || @name.empty?
@name
end
end
end
Version data entries
14 entries across 14 versions & 1 rubygems