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# class Prism::Location

This represents a location in the source.

### Attributes

length [R]

The length of this location in bytes.

source [R]

A `Source` object that is used to determine more information from the given offset and length.

start_offset [R]

The byte offset from the beginning of the source where this location starts.

### Public Class Methods

new (source, start_offset, length)
Source

    # File lib/prism/parse_result.rb, line 293
    def initialize(source, start_offset, length)
      @source = source
      @start_offset = start_offset
      @length = length

      # These are used to store comments that are associated with this location.
      # They are initialized to `nil` to save on memory when there are no
      # comments to be attached and/or the comment-related APIs are not used.
      @leading_comments = nil
      @trailing_comments = nil
    end

Create a new location object with the given source, start byte offset, and byte length.

### Public Instance Methods

== (other)
Source

    # File lib/prism/parse_result.rb, line 481
    def ==(other)
      Location === other &&
        other.start_offset == start_offset &&
        other.end_offset == end_offset
    end

Returns true if the given other location is equal to this location.

adjoin (string)
Source

    # File lib/prism/parse_result.rb, line 500
    def adjoin(string)
      line_suffix = source.slice(end_offset, source.line_end(end_offset) - end_offset)

      line_suffix_index = line_suffix.byteindex(string)
      raise "Could not find #{string}" if line_suffix_index.nil?

      Location.new(source, start_offset, length + line_suffix_index + string.bytesize)
    end

Join this location with the first occurrence of the string in the source that occurs after this location on the same line, and return the new location. This will raise an error if the string does not exist.

cached_end_code_units_column (cache)
Source

    # File lib/prism/parse_result.rb, line 466
    def cached_end_code_units_column(cache)
      cache[end_offset] - cache[source.line_start(end_offset)]
    end

The end column in code units using the given cache to fetch or calculate the value.

cached_end_code_units_offset (cache)
Source

    # File lib/prism/parse_result.rb, line 402
    def cached_end_code_units_offset(cache)
      cache[end_offset]
    end

The end offset from the start of the file in code units using the given cache to fetch or calculate the value.

cached_start_code_units_column (cache)
Source

    # File lib/prism/parse_result.rb, line 442
    def cached_start_code_units_column(cache)
      cache[start_offset] - cache[source.line_start(start_offset)]
    end

The start column in code units using the given cache to fetch or calculate the value.

cached_start_code_units_offset (cache)
Source

    # File lib/prism/parse_result.rb, line 380
    def cached_start_code_units_offset(cache)
      cache[start_offset]
    end

The start offset from the start of the file in code units using the given cache to fetch or calculate the value.

chop ()
Source

    # File lib/prism/parse_result.rb, line 339
    def chop
      copy(length: length == 0 ? length : length - 1)
    end

Returns a new location that is the result of chopping off the last byte.

comments ()
Source

    # File lib/prism/parse_result.rb, line 329
    def comments
      [*@leading_comments, *@trailing_comments]
    end

Returns all comments that are associated with this location (both leading and trailing comments).

copy (source: self.source, start_offset: self.start_offset, length: self.length)
Source

    # File lib/prism/parse_result.rb, line 334
    def copy(source: self.source, start_offset: self.start_offset, length: self.length)
      Location.new(source, start_offset, length)
    end

Create a new location object with the given options.

deconstruct_keys (keys)
Source

    # File lib/prism/parse_result.rb, line 471
    def deconstruct_keys(keys)
      { start_offset: start_offset, end_offset: end_offset }
    end

Implement the hash pattern matching interface for `Location`.

end_character_column ()
Source

    # File lib/prism/parse_result.rb, line 454
    def end_character_column
      source.character_column(end_offset)
    end

The column number in characters where this location ends from the start of the line.

end_character_offset ()
Source

    # File lib/prism/parse_result.rb, line 391
    def end_character_offset
      source.character_offset(end_offset)
    end

The character offset from the beginning of the source where this location ends.

end_code_units_column (encoding = Encoding::UTF_16LE)
Source

    # File lib/prism/parse_result.rb, line 460
    def end_code_units_column(encoding = Encoding::UTF_16LE)
      source.code_units_column(end_offset, encoding)
    end

The column number in code units of the given encoding where this location ends from the start of the line.

end_code_units_offset (encoding = Encoding::UTF_16LE)
Source

    # File lib/prism/parse_result.rb, line 396
    def end_code_units_offset(encoding = Encoding::UTF_16LE)
      source.code_units_offset(end_offset, encoding)
    end

The offset from the start of the file in code units of the given encoding.

end_column ()
Source

    # File lib/prism/parse_result.rb, line 448
    def end_column
      source.column(end_offset)
    end

The column number in bytes where this location ends from the start of the line.

end_line ()
Source

    # File lib/prism/parse_result.rb, line 418
    def end_line
      source.line(end_offset)
    end

The line number where this location ends.

end_offset ()
Source

    # File lib/prism/parse_result.rb, line 385
    def end_offset
      start_offset + length
    end

The byte offset from the beginning of the source where this location ends.

inspect ()
Source

    # File lib/prism/parse_result.rb, line 344
    def inspect
      "#<Prism::Location @start_offset=#{@start_offset} @length=#{@length} start_line=#{start_line}>"
    end

Returns a string representation of this location.

join (other)
Source

    # File lib/prism/parse_result.rb, line 490
    def join(other)
      raise "Incompatible sources" if source != other.source
      raise "Incompatible locations" if start_offset > other.start_offset

      Location.new(source, start_offset, other.end_offset - start_offset)
    end

Returns a new location that stretches from this location to the given other location. Raises an error if this location is not before the other location or if they don’t share the same source.

leading_comment (comment)
Source

    # File lib/prism/parse_result.rb, line 312
    def leading_comment(comment)
      leading_comments << comment
    end

Attach a comment to the leading comments of this location.

leading_comments ()
Source

    # File lib/prism/parse_result.rb, line 307
    def leading_comments
      @leading_comments ||= []
    end

These are the comments that are associated with this location that exist before the start of this location.

pretty_print (q)
Source

    # File lib/prism/parse_result.rb, line 476
    def pretty_print(q)
      q.text("(#{start_line},#{start_column})-(#{end_line},#{end_column})")
    end

Implement the pretty print interface for `Location`.

slice ()
Source

    # File lib/prism/parse_result.rb, line 354
    def slice
      source.slice(start_offset, length)
    end

The source code that this location represents.

slice_lines ()
Source

    # File lib/prism/parse_result.rb, line 361
    def slice_lines
      line_start = source.line_start(start_offset)
      line_end = source.line_end(end_offset)
      source.slice(line_start, line_end - line_start)
    end

The source code that this location represents starting from the beginning of the line that this location starts on to the end of the line that this location ends on.

source_lines ()
Source

    # File lib/prism/parse_result.rb, line 349
    def source_lines
      source.lines
    end

Returns all of the lines of the source code associated with this location.

start_character_column ()
Source

    # File lib/prism/parse_result.rb, line 430
    def start_character_column
      source.character_column(start_offset)
    end

The column number in characters where this location ends from the start of the line.

start_character_offset ()
Source

    # File lib/prism/parse_result.rb, line 369
    def start_character_offset
      source.character_offset(start_offset)
    end

The character offset from the beginning of the source where this location starts.

start_code_units_column (encoding = Encoding::UTF_16LE)
Source

    # File lib/prism/parse_result.rb, line 436
    def start_code_units_column(encoding = Encoding::UTF_16LE)
      source.code_units_column(start_offset, encoding)
    end

The column number in code units of the given encoding where this location starts from the start of the line.

start_code_units_offset (encoding = Encoding::UTF_16LE)
Source

    # File lib/prism/parse_result.rb, line 374
    def start_code_units_offset(encoding = Encoding::UTF_16LE)
      source.code_units_offset(start_offset, encoding)
    end

The offset from the start of the file in code units of the given encoding.

start_column ()
Source

    # File lib/prism/parse_result.rb, line 424
    def start_column
      source.column(start_offset)
    end

The column number in bytes where this location starts from the start of the line.

start_line ()
Source

    # File lib/prism/parse_result.rb, line 407
    def start_line
      source.line(start_offset)
    end

The line number where this location starts.

start_line_slice ()
Source

    # File lib/prism/parse_result.rb, line 412
    def start_line_slice
      offset = source.line_start(start_offset)
      source.slice(offset, start_offset - offset)
    end

The content of the line where this location starts before this location.

trailing_comment (comment)
Source

    # File lib/prism/parse_result.rb, line 323
    def trailing_comment(comment)
      trailing_comments << comment
    end

Attach a comment to the trailing comments of this location.

trailing_comments ()
Source

    # File lib/prism/parse_result.rb, line 318
    def trailing_comments
      @trailing_comments ||= []
    end

These are the comments that are associated with this location that exist after the end of this location.