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Class: Prism::Location

Relationships & Source Files
Inherits: Object
Defined in: lib/prism/parse_result.rb

Overview

This represents a location in the source.

Class Method Summary

Instance Attribute Summary

  • #length readonly

    The length of this location in bytes.

  • #start_offset readonly

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

  • #source readonly protected

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

Instance Method Summary

Constructor Details

.new(source, start_offset, length) ⇒ Location

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

[ GitHub ] 

  


# File 'lib/prism/parse_result.rb', line 305


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


  







Instance Attribute Details



  

    #length   (readonly)
  



  

    

The length of this location in bytes.


  



  [ GitHub ]


  

  


# File 'lib/prism/parse_result.rb', line 301


attr_reader :length


  








  

    #source   (readonly, protected)
  



  

    

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


  



  [ GitHub ]


  

  


# File 'lib/prism/parse_result.rb', line 293


attr_reader :source


  








  

    #start_offset   (readonly)
  



  

    

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


  



  [ GitHub ]


  

  


# File 'lib/prism/parse_result.rb', line 298


attr_reader :start_offset


  







Instance Method Details



  

    #==(other)  
  



  

    

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


  



  [ GitHub ]


  

  


# File 'lib/prism/parse_result.rb', line 493


def ==(other)
  Location === other &&
    other.start_offset == start_offset &&
    other.end_offset == end_offset
end


  








  

    #adjoin(string)  
  



  

    

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.


  



  [ GitHub ]


  

  


# File 'lib/prism/parse_result.rb', line 512


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


  








  

    #cached_end_code_units_column(cache)  
  



  

    

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


  



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# File 'lib/prism/parse_result.rb', line 478


def cached_end_code_units_column(cache)
  cache[end_offset] - cache[source.line_start(end_offset)]
end


  








  

    #cached_end_code_units_offset(cache)  
  



  

    

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


  



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# File 'lib/prism/parse_result.rb', line 414


def cached_end_code_units_offset(cache)
  cache[end_offset]
end


  








  

    #cached_start_code_units_column(cache)  
  



  

    

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


  



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# File 'lib/prism/parse_result.rb', line 454


def cached_start_code_units_column(cache)
  cache[start_offset] - cache[source.line_start(start_offset)]
end


  








  

    #cached_start_code_units_offset(cache)  
  



  

    

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


  



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# File 'lib/prism/parse_result.rb', line 392


def cached_start_code_units_offset(cache)
  cache[start_offset]
end


  








  

    #chop  
  



  

    

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


  



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# File 'lib/prism/parse_result.rb', line 351


def chop
  copy(length: length == 0 ? length : length - 1)
end


  








  

    #comments  
  



  

    

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


  



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# File 'lib/prism/parse_result.rb', line 341


def comments
  [*@leading_comments, *@trailing_comments]
end


  








  

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



  

    

Create a new location object with the given options.


  



  [ GitHub ]


  

  


# File 'lib/prism/parse_result.rb', line 346


def copy(source: self.source, start_offset: self.start_offset, length: self.length)
  Location.new(source, start_offset, length)
end


  








  

    #deconstruct_keys(keys)  
  



  

    

Implement the hash pattern matching interface for Location.


  



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# File 'lib/prism/parse_result.rb', line 483


def deconstruct_keys(keys)
  { start_offset: start_offset, end_offset: end_offset }
end


  








  

    #end_character_column  
  



  

    

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


  



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# File 'lib/prism/parse_result.rb', line 466


def end_character_column
  source.character_column(end_offset)
end


  








  

    #end_character_offset  
  



  

    

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


  



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# File 'lib/prism/parse_result.rb', line 403


def end_character_offset
  source.character_offset(end_offset)
end


  








  

    #end_code_units_column(encoding = Encoding::UTF_16LE)  
  



  

    

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


  



  [ GitHub ]


  

  


# File 'lib/prism/parse_result.rb', line 472


def end_code_units_column(encoding = Encoding::UTF_16LE)
  source.code_units_column(end_offset, encoding)
end


  








  

    #end_code_units_offset(encoding = Encoding::UTF_16LE)  
  



  

    

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


  



  [ GitHub ]


  

  


# File 'lib/prism/parse_result.rb', line 408


def end_code_units_offset(encoding = Encoding::UTF_16LE)
  source.code_units_offset(end_offset, encoding)
end


  








  

    #end_column  
  



  

    

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


  



  [ GitHub ]


  

  


# File 'lib/prism/parse_result.rb', line 460


def end_column
  source.column(end_offset)
end


  








  

    #end_line  
  



  

    

The line number where this location ends.


  



  [ GitHub ]


  

  


# File 'lib/prism/parse_result.rb', line 430


def end_line
  source.line(end_offset)
end


  








  

    #end_offset  
  



  

    

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


  



  [ GitHub ]


  

  


# File 'lib/prism/parse_result.rb', line 397


def end_offset
  start_offset + length
end


  








  

    #inspect  
  



  

    

Returns a string representation of this location.


  



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# File 'lib/prism/parse_result.rb', line 356


def inspect
  "#<Prism::Location @start_offset=#{@start_offset} @length=#{@length} start_line=#{start_line}>"
end


  








  

    #join(other)  
  



  

    

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.


  



  [ GitHub ]


  

  


# File 'lib/prism/parse_result.rb', line 502


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


  








  

    #leading_comment(comment)  
  



  

    

Attach a comment to the leading comments of this location.


  



  [ GitHub ]


  

  


# File 'lib/prism/parse_result.rb', line 324


def leading_comment(comment)
  leading_comments << comment
end


  








  

    #leading_comments  
  



  

    

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


  



  [ GitHub ]


  

  


# File 'lib/prism/parse_result.rb', line 319


def leading_comments
  @leading_comments ||= []
end


  








  

    #pretty_print(q)  
  



  

    

Implement the pretty print interface for Location.


  



  [ GitHub ]


  

  


# File 'lib/prism/parse_result.rb', line 488


def pretty_print(q)
  q.text("(#{start_line},#{start_column})-(#{end_line},#{end_column})")
end


  








  

    #slice  
  



  

    

The source code that this location represents.


  



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# File 'lib/prism/parse_result.rb', line 366


def slice
  source.slice(start_offset, length)
end


  








  

    #slice_lines  
  



  

    

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.


  



  [ GitHub ]


  

  


# File 'lib/prism/parse_result.rb', line 373


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


  








  

    #source_lines  
  



  

    

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


  



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# File 'lib/prism/parse_result.rb', line 361


def source_lines
  source.lines
end


  








  

    #start_character_column  
  



  

    

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


  



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# File 'lib/prism/parse_result.rb', line 442


def start_character_column
  source.character_column(start_offset)
end


  








  

    #start_character_offset  
  



  

    

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


  



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# File 'lib/prism/parse_result.rb', line 381


def start_character_offset
  source.character_offset(start_offset)
end


  








  

    #start_code_units_column(encoding = Encoding::UTF_16LE)  
  



  

    

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


  



  [ GitHub ]


  

  


# File 'lib/prism/parse_result.rb', line 448


def start_code_units_column(encoding = Encoding::UTF_16LE)
  source.code_units_column(start_offset, encoding)
end


  








  

    #start_code_units_offset(encoding = Encoding::UTF_16LE)  
  



  

    

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


  



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# File 'lib/prism/parse_result.rb', line 386


def start_code_units_offset(encoding = Encoding::UTF_16LE)
  source.code_units_offset(start_offset, encoding)
end


  








  

    #start_column  
  



  

    

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


  



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# File 'lib/prism/parse_result.rb', line 436


def start_column
  source.column(start_offset)
end


  








  

    #start_line  
  



  

    

The line number where this location starts.


  



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# File 'lib/prism/parse_result.rb', line 419


def start_line
  source.line(start_offset)
end


  








  

    #start_line_slice  
  



  

    

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


  



  [ GitHub ]


  

  


# File 'lib/prism/parse_result.rb', line 424


def start_line_slice
  offset = source.line_start(start_offset)
  source.slice(offset, start_offset - offset)
end


  








  

    #trailing_comment(comment)  
  



  

    

Attach a comment to the trailing comments of this location.


  



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# File 'lib/prism/parse_result.rb', line 335


def trailing_comment(comment)
  trailing_comments << comment
end


  








  

    #trailing_comments  
  



  

    

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


  



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# File 'lib/prism/parse_result.rb', line 330


def trailing_comments
  @trailing_comments ||= []
end