Class: Parser::Source::Range

Inherits:
Object
  • Object
show all
Defined in:
lib/parser/source/range.rb

Overview

A range of characters in a particular source buffer.

The range is always exclusive, i.e. a range with begin_pos of 3 and end_pos of 5 will contain the following characters:

example
   ^^

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(source_buffer, begin_pos, end_pos) ⇒ Range

Returns a new instance of Range



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# File 'lib/parser/source/range.rb', line 33

def initialize(source_buffer, begin_pos, end_pos)
  if end_pos < begin_pos
    raise ArgumentError, 'Parser::Source::Range: end_pos must not be less than begin_pos'
  end
  if source_buffer.nil?
    raise ArgumentError, 'Parser::Source::Range: source_buffer must not be nil'
  end

  @source_buffer       = source_buffer
  @begin_pos, @end_pos = begin_pos, end_pos

  freeze
end

Instance Attribute Details

#begin_posInteger (readonly)

Returns index of the first character in the range



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# File 'lib/parser/source/range.rb', line 24

class Range
  attr_reader :source_buffer
  attr_reader :begin_pos, :end_pos

  ##
  # @param [Buffer]  source_buffer
  # @param [Integer] begin_pos
  # @param [Integer] end_pos
  #
  def initialize(source_buffer, begin_pos, end_pos)
    if end_pos < begin_pos
      raise ArgumentError, 'Parser::Source::Range: end_pos must not be less than begin_pos'
    end
    if source_buffer.nil?
      raise ArgumentError, 'Parser::Source::Range: source_buffer must not be nil'
    end

    @source_buffer       = source_buffer
    @begin_pos, @end_pos = begin_pos, end_pos

    freeze
  end

  ##
  # @return [Range] a zero-length range located just before the beginning
  #   of this range.
  #
  def begin
    Range.new(@source_buffer, @begin_pos, @begin_pos)
  end

  ##
  # @return [Range] a zero-length range located just after the end
  #   of this range.
  #
  def end
    Range.new(@source_buffer, @end_pos, @end_pos)
  end

  ##
  # @return [Integer] amount of characters included in this range.
  #
  def size
    @end_pos - @begin_pos
  end

  alias length size

  ##
  # Line number of the beginning of this range. By default, the first line
  # of a buffer is 1; as such, line numbers are most commonly one-based.
  #
  # @see Buffer
  # @return [Integer] line number of the beginning of this range.
  #
  def line
    @source_buffer.line_for_position(@begin_pos)
  end

  alias_method :first_line, :line

  ##
  # @return [Integer] zero-based column number of the beginning of this range.
  #
  def column
    @source_buffer.column_for_position(@begin_pos)
  end

  ##
  # @return [Integer] line number of the end of this range.
  #
  def last_line
    @source_buffer.line_for_position(@end_pos)
  end

  ##
  # @return [Integer] zero-based column number of the end of this range.
  #
  def last_column
    @source_buffer.column_for_position(@end_pos)
  end

  ##
  # @return [::Range] a range of columns spanned by this range.
  # @raise RangeError
  #
  def column_range
    if self.begin.line != self.end.line
      raise RangeError, "#{self.inspect} spans more than one line"
    end

    self.begin.column...self.end.column
  end

  ##
  # @return [String] a line of source code containing the beginning of this range.
  #
  def source_line
    @source_buffer.source_line(line)
  end

  ##
  # @return [String] all source code covered by this range.
  #
  def source
    @source_buffer.slice(self.begin_pos...self.end_pos)
  end

  ##
  # `is?` provides a concise way to compare the source corresponding to this range.
  # For example, `r.source == '(' || r.source == 'begin'` is equivalent to
  # `r.is?('(', 'begin')`.
  #
  def is?(*what)
    what.include?(source)
  end

  ##
  # @return [Array(Integer)] a set of character indexes contained in this range.
  #
  def to_a
    (@begin_pos...@end_pos).to_a
  end

  ##
  # Composes a GNU/Clang-style string representation of the beginning of this
  # range.
  #
  # For example, for the following range in file `foo.rb`,
  #
  #     def foo
  #         ^^^
  #
  # `to_s` will return `foo.rb:1:5`.
  # Note that the column index is one-based.
  #
  # @return [String]
  #
  def to_s
    line, column = @source_buffer.decompose_position(@begin_pos)

    [@source_buffer.name, line, column + 1].join(':')
  end

  ##
  # @param [Integer] new_size
  # @return [Range] a range beginning at the same point as this range and length `new_size`.
  #
  def resize(new_size)
    Range.new(@source_buffer, @begin_pos, @begin_pos + new_size)
  end

  ##
  # @param [Range] other
  # @return [Range] smallest possible range spanning both this range and `other`.
  #
  def join(other)
    Range.new(@source_buffer,
        [@begin_pos, other.begin_pos].min,
        [@end_pos,   other.end_pos].max)
  end

  ##
  # @param [Range] other
  # @return [Range] overlapping region of this range and `other`, or `nil`
  #   if they do not overlap
  #
  def intersect(other)
    unless disjoint?(other)
      Range.new(@source_buffer,
        [@begin_pos, other.begin_pos].max,
        [@end_pos,   other.end_pos].min)
    end
  end

  ##
  # @param [Range] other
  # @return [Boolean] `true` if this range and `other` do not overlap
  #
  def disjoint?(other)
    @begin_pos >= other.end_pos || other.begin_pos >= @end_pos
  end

  ##
  # @param [Range] other
  # @return [Boolean] `true` if this range and `other` overlap
  #
  def overlaps?(other)
    @begin_pos < other.end_pos && other.begin_pos < @end_pos
  end

  ##
  # Checks if a range is empty; if it contains no characters
  # @return [Boolean]
  def empty?
    @begin_pos == @end_pos
  end

  ##
  # Compares ranges.
  # @return [Boolean]
  #
  def ==(other)
    other.is_a?(Range) &&
      @source_buffer == other.source_buffer &&
      @begin_pos     == other.begin_pos     &&
      @end_pos       == other.end_pos
  end

  ##
  # @return [String] a human-readable representation of this range.
  #
  def inspect
    "#<Parser::Source::Range #{@source_buffer.name} #{@begin_pos}...#{@end_pos}>"
  end
end

#end_posInteger (readonly)

Returns index of the character after the last character in the range



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# File 'lib/parser/source/range.rb', line 24

class Range
  attr_reader :source_buffer
  attr_reader :begin_pos, :end_pos

  ##
  # @param [Buffer]  source_buffer
  # @param [Integer] begin_pos
  # @param [Integer] end_pos
  #
  def initialize(source_buffer, begin_pos, end_pos)
    if end_pos < begin_pos
      raise ArgumentError, 'Parser::Source::Range: end_pos must not be less than begin_pos'
    end
    if source_buffer.nil?
      raise ArgumentError, 'Parser::Source::Range: source_buffer must not be nil'
    end

    @source_buffer       = source_buffer
    @begin_pos, @end_pos = begin_pos, end_pos

    freeze
  end

  ##
  # @return [Range] a zero-length range located just before the beginning
  #   of this range.
  #
  def begin
    Range.new(@source_buffer, @begin_pos, @begin_pos)
  end

  ##
  # @return [Range] a zero-length range located just after the end
  #   of this range.
  #
  def end
    Range.new(@source_buffer, @end_pos, @end_pos)
  end

  ##
  # @return [Integer] amount of characters included in this range.
  #
  def size
    @end_pos - @begin_pos
  end

  alias length size

  ##
  # Line number of the beginning of this range. By default, the first line
  # of a buffer is 1; as such, line numbers are most commonly one-based.
  #
  # @see Buffer
  # @return [Integer] line number of the beginning of this range.
  #
  def line
    @source_buffer.line_for_position(@begin_pos)
  end

  alias_method :first_line, :line

  ##
  # @return [Integer] zero-based column number of the beginning of this range.
  #
  def column
    @source_buffer.column_for_position(@begin_pos)
  end

  ##
  # @return [Integer] line number of the end of this range.
  #
  def last_line
    @source_buffer.line_for_position(@end_pos)
  end

  ##
  # @return [Integer] zero-based column number of the end of this range.
  #
  def last_column
    @source_buffer.column_for_position(@end_pos)
  end

  ##
  # @return [::Range] a range of columns spanned by this range.
  # @raise RangeError
  #
  def column_range
    if self.begin.line != self.end.line
      raise RangeError, "#{self.inspect} spans more than one line"
    end

    self.begin.column...self.end.column
  end

  ##
  # @return [String] a line of source code containing the beginning of this range.
  #
  def source_line
    @source_buffer.source_line(line)
  end

  ##
  # @return [String] all source code covered by this range.
  #
  def source
    @source_buffer.slice(self.begin_pos...self.end_pos)
  end

  ##
  # `is?` provides a concise way to compare the source corresponding to this range.
  # For example, `r.source == '(' || r.source == 'begin'` is equivalent to
  # `r.is?('(', 'begin')`.
  #
  def is?(*what)
    what.include?(source)
  end

  ##
  # @return [Array(Integer)] a set of character indexes contained in this range.
  #
  def to_a
    (@begin_pos...@end_pos).to_a
  end

  ##
  # Composes a GNU/Clang-style string representation of the beginning of this
  # range.
  #
  # For example, for the following range in file `foo.rb`,
  #
  #     def foo
  #         ^^^
  #
  # `to_s` will return `foo.rb:1:5`.
  # Note that the column index is one-based.
  #
  # @return [String]
  #
  def to_s
    line, column = @source_buffer.decompose_position(@begin_pos)

    [@source_buffer.name, line, column + 1].join(':')
  end

  ##
  # @param [Integer] new_size
  # @return [Range] a range beginning at the same point as this range and length `new_size`.
  #
  def resize(new_size)
    Range.new(@source_buffer, @begin_pos, @begin_pos + new_size)
  end

  ##
  # @param [Range] other
  # @return [Range] smallest possible range spanning both this range and `other`.
  #
  def join(other)
    Range.new(@source_buffer,
        [@begin_pos, other.begin_pos].min,
        [@end_pos,   other.end_pos].max)
  end

  ##
  # @param [Range] other
  # @return [Range] overlapping region of this range and `other`, or `nil`
  #   if they do not overlap
  #
  def intersect(other)
    unless disjoint?(other)
      Range.new(@source_buffer,
        [@begin_pos, other.begin_pos].max,
        [@end_pos,   other.end_pos].min)
    end
  end

  ##
  # @param [Range] other
  # @return [Boolean] `true` if this range and `other` do not overlap
  #
  def disjoint?(other)
    @begin_pos >= other.end_pos || other.begin_pos >= @end_pos
  end

  ##
  # @param [Range] other
  # @return [Boolean] `true` if this range and `other` overlap
  #
  def overlaps?(other)
    @begin_pos < other.end_pos && other.begin_pos < @end_pos
  end

  ##
  # Checks if a range is empty; if it contains no characters
  # @return [Boolean]
  def empty?
    @begin_pos == @end_pos
  end

  ##
  # Compares ranges.
  # @return [Boolean]
  #
  def ==(other)
    other.is_a?(Range) &&
      @source_buffer == other.source_buffer &&
      @begin_pos     == other.begin_pos     &&
      @end_pos       == other.end_pos
  end

  ##
  # @return [String] a human-readable representation of this range.
  #
  def inspect
    "#<Parser::Source::Range #{@source_buffer.name} #{@begin_pos}...#{@end_pos}>"
  end
end

#source_bufferParser::Diagnostic::Engine (readonly)



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# File 'lib/parser/source/range.rb', line 24

class Range
  attr_reader :source_buffer
  attr_reader :begin_pos, :end_pos

  ##
  # @param [Buffer]  source_buffer
  # @param [Integer] begin_pos
  # @param [Integer] end_pos
  #
  def initialize(source_buffer, begin_pos, end_pos)
    if end_pos < begin_pos
      raise ArgumentError, 'Parser::Source::Range: end_pos must not be less than begin_pos'
    end
    if source_buffer.nil?
      raise ArgumentError, 'Parser::Source::Range: source_buffer must not be nil'
    end

    @source_buffer       = source_buffer
    @begin_pos, @end_pos = begin_pos, end_pos

    freeze
  end

  ##
  # @return [Range] a zero-length range located just before the beginning
  #   of this range.
  #
  def begin
    Range.new(@source_buffer, @begin_pos, @begin_pos)
  end

  ##
  # @return [Range] a zero-length range located just after the end
  #   of this range.
  #
  def end
    Range.new(@source_buffer, @end_pos, @end_pos)
  end

  ##
  # @return [Integer] amount of characters included in this range.
  #
  def size
    @end_pos - @begin_pos
  end

  alias length size

  ##
  # Line number of the beginning of this range. By default, the first line
  # of a buffer is 1; as such, line numbers are most commonly one-based.
  #
  # @see Buffer
  # @return [Integer] line number of the beginning of this range.
  #
  def line
    @source_buffer.line_for_position(@begin_pos)
  end

  alias_method :first_line, :line

  ##
  # @return [Integer] zero-based column number of the beginning of this range.
  #
  def column
    @source_buffer.column_for_position(@begin_pos)
  end

  ##
  # @return [Integer] line number of the end of this range.
  #
  def last_line
    @source_buffer.line_for_position(@end_pos)
  end

  ##
  # @return [Integer] zero-based column number of the end of this range.
  #
  def last_column
    @source_buffer.column_for_position(@end_pos)
  end

  ##
  # @return [::Range] a range of columns spanned by this range.
  # @raise RangeError
  #
  def column_range
    if self.begin.line != self.end.line
      raise RangeError, "#{self.inspect} spans more than one line"
    end

    self.begin.column...self.end.column
  end

  ##
  # @return [String] a line of source code containing the beginning of this range.
  #
  def source_line
    @source_buffer.source_line(line)
  end

  ##
  # @return [String] all source code covered by this range.
  #
  def source
    @source_buffer.slice(self.begin_pos...self.end_pos)
  end

  ##
  # `is?` provides a concise way to compare the source corresponding to this range.
  # For example, `r.source == '(' || r.source == 'begin'` is equivalent to
  # `r.is?('(', 'begin')`.
  #
  def is?(*what)
    what.include?(source)
  end

  ##
  # @return [Array(Integer)] a set of character indexes contained in this range.
  #
  def to_a
    (@begin_pos...@end_pos).to_a
  end

  ##
  # Composes a GNU/Clang-style string representation of the beginning of this
  # range.
  #
  # For example, for the following range in file `foo.rb`,
  #
  #     def foo
  #         ^^^
  #
  # `to_s` will return `foo.rb:1:5`.
  # Note that the column index is one-based.
  #
  # @return [String]
  #
  def to_s
    line, column = @source_buffer.decompose_position(@begin_pos)

    [@source_buffer.name, line, column + 1].join(':')
  end

  ##
  # @param [Integer] new_size
  # @return [Range] a range beginning at the same point as this range and length `new_size`.
  #
  def resize(new_size)
    Range.new(@source_buffer, @begin_pos, @begin_pos + new_size)
  end

  ##
  # @param [Range] other
  # @return [Range] smallest possible range spanning both this range and `other`.
  #
  def join(other)
    Range.new(@source_buffer,
        [@begin_pos, other.begin_pos].min,
        [@end_pos,   other.end_pos].max)
  end

  ##
  # @param [Range] other
  # @return [Range] overlapping region of this range and `other`, or `nil`
  #   if they do not overlap
  #
  def intersect(other)
    unless disjoint?(other)
      Range.new(@source_buffer,
        [@begin_pos, other.begin_pos].max,
        [@end_pos,   other.end_pos].min)
    end
  end

  ##
  # @param [Range] other
  # @return [Boolean] `true` if this range and `other` do not overlap
  #
  def disjoint?(other)
    @begin_pos >= other.end_pos || other.begin_pos >= @end_pos
  end

  ##
  # @param [Range] other
  # @return [Boolean] `true` if this range and `other` overlap
  #
  def overlaps?(other)
    @begin_pos < other.end_pos && other.begin_pos < @end_pos
  end

  ##
  # Checks if a range is empty; if it contains no characters
  # @return [Boolean]
  def empty?
    @begin_pos == @end_pos
  end

  ##
  # Compares ranges.
  # @return [Boolean]
  #
  def ==(other)
    other.is_a?(Range) &&
      @source_buffer == other.source_buffer &&
      @begin_pos     == other.begin_pos     &&
      @end_pos       == other.end_pos
  end

  ##
  # @return [String] a human-readable representation of this range.
  #
  def inspect
    "#<Parser::Source::Range #{@source_buffer.name} #{@begin_pos}...#{@end_pos}>"
  end
end

Instance Method Details

#==(other) ⇒ Boolean

Compares ranges.



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# File 'lib/parser/source/range.rb', line 226

def ==(other)
  other.is_a?(Range) &&
    @source_buffer == other.source_buffer &&
    @begin_pos     == other.begin_pos     &&
    @end_pos       == other.end_pos
end

#beginRange

Returns a zero-length range located just before the beginning of this range.



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# File 'lib/parser/source/range.rb', line 51

def begin
  Range.new(@source_buffer, @begin_pos, @begin_pos)
end

#columnInteger

Returns zero-based column number of the beginning of this range.



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# File 'lib/parser/source/range.rb', line 88

def column
  @source_buffer.column_for_position(@begin_pos)
end

#column_range::Range

Returns a range of columns spanned by this range.

Raises:

  • RangeError



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# File 'lib/parser/source/range.rb', line 110

def column_range
  if self.begin.line != self.end.line
    raise RangeError, "#{self.inspect} spans more than one line"
  end

  self.begin.column...self.end.column
end

#disjoint?(other) ⇒ Boolean

Returns true if this range and other do not overlap



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# File 'lib/parser/source/range.rb', line 203

def disjoint?(other)
  @begin_pos >= other.end_pos || other.begin_pos >= @end_pos
end

#empty?Boolean

Checks if a range is empty; if it contains no characters



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# File 'lib/parser/source/range.rb', line 218

def empty?
  @begin_pos == @end_pos
end

#endRange

Returns a zero-length range located just after the end of this range.



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# File 'lib/parser/source/range.rb', line 59

def end
  Range.new(@source_buffer, @end_pos, @end_pos)
end

#inspectString

Returns a human-readable representation of this range.



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# File 'lib/parser/source/range.rb', line 236

def inspect
  "#<Parser::Source::Range #{@source_buffer.name} #{@begin_pos}...#{@end_pos}>"
end

#intersect(other) ⇒ Range

Returns overlapping region of this range and other, or nil if they do not overlap



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# File 'lib/parser/source/range.rb', line 191

def intersect(other)
  unless disjoint?(other)
    Range.new(@source_buffer,
      [@begin_pos, other.begin_pos].max,
      [@end_pos,   other.end_pos].min)
  end
end

#is?(*what) ⇒ Boolean

is? provides a concise way to compare the source corresponding to this range. For example, r.source == '(' || r.source == 'begin' is equivalent to r.is?('(', 'begin').



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# File 'lib/parser/source/range.rb', line 137

def is?(*what)
  what.include?(source)
end

#join(other) ⇒ Range

Returns smallest possible range spanning both this range and other.



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# File 'lib/parser/source/range.rb', line 180

def join(other)
  Range.new(@source_buffer,
      [@begin_pos, other.begin_pos].min,
      [@end_pos,   other.end_pos].max)
end

#last_columnInteger

Returns zero-based column number of the end of this range.



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# File 'lib/parser/source/range.rb', line 102

def last_column
  @source_buffer.column_for_position(@end_pos)
end

#last_lineInteger

Returns line number of the end of this range.



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# File 'lib/parser/source/range.rb', line 95

def last_line
  @source_buffer.line_for_position(@end_pos)
end

#lineInteger Also known as: first_line

Line number of the beginning of this range. By default, the first line of a buffer is 1; as such, line numbers are most commonly one-based.

See Also:



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# File 'lib/parser/source/range.rb', line 79

def line
  @source_buffer.line_for_position(@begin_pos)
end

#overlaps?(other) ⇒ Boolean

Returns true if this range and other overlap



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# File 'lib/parser/source/range.rb', line 211

def overlaps?(other)
  @begin_pos < other.end_pos && other.begin_pos < @end_pos
end

#resize(new_size) ⇒ Range

Returns a range beginning at the same point as this range and length new_size.



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# File 'lib/parser/source/range.rb', line 172

def resize(new_size)
  Range.new(@source_buffer, @begin_pos, @begin_pos + new_size)
end

#sizeInteger Also known as: length

Returns amount of characters included in this range.



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# File 'lib/parser/source/range.rb', line 66

def size
  @end_pos - @begin_pos
end

#sourceString

Returns all source code covered by this range.



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# File 'lib/parser/source/range.rb', line 128

def source
  @source_buffer.slice(self.begin_pos...self.end_pos)
end

#source_lineString

Returns a line of source code containing the beginning of this range.



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# File 'lib/parser/source/range.rb', line 121

def source_line
  @source_buffer.source_line(line)
end

#to_aArray(Integer)

Returns a set of character indexes contained in this range.



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# File 'lib/parser/source/range.rb', line 144

def to_a
  (@begin_pos...@end_pos).to_a
end

#to_sString

Composes a GNU/Clang-style string representation of the beginning of this range.

For example, for the following range in file foo.rb,

def foo
    ^^^

to_s will return foo.rb:1:5. Note that the column index is one-based.



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# File 'lib/parser/source/range.rb', line 162

def to_s
  line, column = @source_buffer.decompose_position(@begin_pos)

  [@source_buffer.name, line, column + 1].join(':')
end