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 402
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 654
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 677
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 633
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 547
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 601
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 517
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 462
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 448
def comments
  [*@leading_comments, *@trailing_comments] #: Array[Comment]
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 455
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.

end_character_column ()

Source

# File lib/prism/parse_result.rb, line 617
def end_character_column
  source.character_column(end_offset)
end

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

end_character_offset ()

Source

# File lib/prism/parse_result.rb, line 532
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 625
def end_code_units_column(encoding = Encoding::UTF_16LE)
  source.code_units_column(end_offset, encoding)
end

The column 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 539
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 609
def end_column
  source.column(end_offset)
end

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

end_line ()

Source

# File lib/prism/parse_result.rb, line 569
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 524
def end_offset
  start_offset + length
end

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

join (other)

Source

# File lib/prism/parse_result.rb, line 665
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 425
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 418
def leading_comments
  @leading_comments ||= []
end

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

slice ()

Source

# File lib/prism/parse_result.rb, line 483
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 492
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 476
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 585
def start_character_column
  source.character_column(start_offset)
end

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

start_character_offset ()

Source

# File lib/prism/parse_result.rb, line 502
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 593
def start_code_units_column(encoding = Encoding::UTF_16LE)
  source.code_units_column(start_offset, encoding)
end

The column 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 509
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 577
def start_column
  source.column(start_offset)
end

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

start_line ()

Source

# File lib/prism/parse_result.rb, line 554
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 561
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 440
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 433
def trailing_comments
  @trailing_comments ||= []
end

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