class Prism::ASCIISource

# File lib/prism/parse_result.rb, line 243
def character_column(byte_offset)
  byte_offset - line_start(byte_offset)
end

Return the column number in characters for the given byte offset.

# File lib/prism/parse_result.rb, line 238
def character_offset(byte_offset)
  byte_offset
end

Return the character offset for the given byte offset.

# File lib/prism/parse_result.rb, line 260
def code_units_cache(encoding)
  ->(byte_offset) { byte_offset }
end

Returns a cache that is the identity function in order to maintain the same interface. We can do this because code units are always equivalent to byte offsets for ASCII-only sources.

# File lib/prism/parse_result.rb, line 267
def code_units_column(byte_offset, encoding)
  byte_offset - line_start(byte_offset)
end

Specialized version of ‘code_units_column` that does not depend on `code_units_offset`, which is a more expensive operation. This is essentially the same as `Prism::Source#column`.

# File lib/prism/parse_result.rb, line 253
def code_units_offset(byte_offset, encoding)
  byte_offset
end

Returns the offset from the start of the file for the given byte offset counting in code units for the given encoding.

This method is tested with UTF-8, UTF-16, and UTF-32. If there is the concept of code units that differs from the number of characters in other encodings, it is not captured here.