Class: Pry::Code

Inherits:
Object show all
Extended by:
MethodSource::CodeHelpers
Defined in:
lib/pry/code.rb,
lib/pry/code/loc.rb,
lib/pry/code/code_range.rb

Overview

Pry::Code is a class that encapsulates lines of source code and their line numbers and formats them for terminal output. It can read from a file or method definition or be instantiated with a String or an Array.

In general, the formatting methods in Code return a new Code object which will format the text as specified when #to_s is called. This allows arbitrary chaining of formatting methods without mutating the original object.

Defined Under Namespace

Classes: CodeRange, LOC

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(lines = [], start_line = 1, code_type = :ruby) ⇒ Code

Instantiate a Code object containing code from the given Array, String, or IO. The first line will be line 1 unless specified otherwise. If you need non-contiguous line numbers, you can create an empty Code object and then use #push to insert the lines.



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# File 'lib/pry/code.rb', line 88

def initialize(lines = [], start_line = 1, code_type = :ruby)
  if lines.is_a? String
    lines = lines.lines
  end
  @lines = lines.each_with_index.map { |line, lineno|
    LOC.new(line, lineno + start_line.to_i) }
  @code_type = code_type
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(name, *args, &block) ⇒ Object

Forward any missing methods to the output of #to_s.



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# File 'lib/pry/code.rb', line 329

def method_missing(name, *args, &block)
  to_s.send(name, *args, &block)
end

Instance Attribute Details

#code_typeSymbol



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# File 'lib/pry/code.rb', line 78

def code_type
  @code_type
end

Class Method Details

.from_file(filename, code_type = nil) ⇒ Code

Instantiate a Code object containing code loaded from a file or Pry's line buffer.



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# File 'lib/pry/code.rb', line 42

def from_file(filename, code_type = nil)
  code_file = CodeFile.new(filename, code_type)
  # binding.pry
  new(code_file.code, 1, code_file.code_type)
end

.from_method(meth, start_line = nil) ⇒ Code

Instantiate a Code object containing code extracted from a ::Method, UnboundMethod, Proc, or Pry::Method object.



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# File 'lib/pry/code.rb', line 56

def from_method(meth, start_line = nil)
  meth = Pry::Method(meth)
  start_line ||= meth.source_line || 1
  new(meth.source, start_line, meth.source_type)
end

.from_module(mod, candidate_rank = 0, start_line = nil) ⇒ Code

Attempt to extract the source code for module (or class) mod.



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# File 'lib/pry/code.rb', line 70

def from_module(mod, candidate_rank = 0, start_line=nil)
  candidate = Pry::WrappedModule(mod).candidate(candidate_rank)
  start_line ||= candidate.line
  new(candidate.source, start_line, :ruby)
end

Instance Method Details

#==(other) ⇒ Boolean

Two Code objects are equal if they contain the same lines with the same numbers. Otherwise, call to_s and chomp and compare as Strings.



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# File 'lib/pry/code.rb', line 319

def ==(other)
  if other.is_a?(Code)
    other_lines = other.instance_variable_get(:@lines)
    @lines.each_with_index.all? { |loc, i| loc == other_lines[i] }
  else
    to_s.chomp == other.to_s.chomp
  end
end

#after(lineno, lines = 1) ⇒ Code

Remove all lines except for the +lines+ after and excluding +lineno+.



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# File 'lib/pry/code.rb', line 189

def after(lineno, lines = 1)
  return self unless lineno

  select do |loc|
    loc.lineno > lineno && loc.lineno <= lineno + lines
  end
end

#around(lineno, lines = 1) ⇒ Code

Remove all lines except for the +lines+ on either side of and including +lineno+.



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# File 'lib/pry/code.rb', line 176

def around(lineno, lines = 1)
  return self unless lineno

  select do |loc|
    loc.lineno >= lineno - lines && loc.lineno <= lineno + lines
  end
end

#before(lineno, lines = 1) ⇒ Code

Remove all lines except for the +lines+ up to and excluding +lineno+.



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# File 'lib/pry/code.rb', line 162

def before(lineno, lines = 1)
  return self unless lineno

  select do |loc|
    loc.lineno >= lineno - lines && loc.lineno < lineno
  end
end

#between(start_line, end_line = nil) ⇒ Code

Remove all lines that aren't in the given range, expressed either as a Range object or a first and last line number (inclusive). Negative indices count from the end of the array of lines.



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# File 'lib/pry/code.rb', line 129

def between(start_line, end_line = nil)
  return self unless start_line

  code_range = CodeRange.new(start_line, end_line)

  alter do
    @lines = @lines[code_range.indices_range(@lines)] || []
  end
end

#comment_describing(line_number) ⇒ String

Get the comment that describes the expression on the given line number.



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# File 'lib/pry/code.rb', line 279

def comment_describing(line_number)
  self.class.comment_describing(raw, line_number)
end

#expression_at(line_number, consume = 0) ⇒ String

Get the multiline expression that starts on the given line number.



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# File 'lib/pry/code.rb', line 287

def expression_at(line_number, consume = 0)
  self.class.expression_at(raw, line_number, :consume => consume)
end

#grep(pattern) ⇒ Code

Remove all lines that don't match the given pattern.



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# File 'lib/pry/code.rb', line 201

def grep(pattern)
  return self unless pattern
  pattern = Regexp.new(pattern)

  select do |loc|
    loc.line =~ pattern
  end
end

#inspectString



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# File 'lib/pry/code.rb', line 245

def inspect
  Object.instance_method(:to_s).bind(self).call
end

#lengthInteger

Return the number of lines stored.



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# File 'lib/pry/code.rb', line 310

def length
  @lines ? @lines.length : 0
end

#max_lineno_widthInteger



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# File 'lib/pry/code.rb', line 250

def max_lineno_width
  @lines.length > 0 ? @lines.last.lineno.to_s.length : 0
end

#nesting_at(line_number, top_module = Object) ⇒ Array<Module>

Get the (approximate) Module.nesting at the give line number.



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# File 'lib/pry/code.rb', line 296

def nesting_at(line_number, top_module = Object)
  Pry::Indent.nesting_at(raw, line_number)
end

Writes a formatted representation (based on the configuration of the object) to the given output, which must respond to #<<.



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# File 'lib/pry/code.rb', line 262

def print_to_output(output)
  @lines.each do |loc|
    loc = loc.dup
    loc.colorize(@code_type)              if Pry.color
    loc.add_line_number(max_lineno_width) if @with_line_numbers
    loc.add_marker(@marker_lineno)        if @with_marker
    loc.indent(@indentation_num)          if @with_indentation
    output << loc.line
    output << "\n"
  end
  output
end

#push(line, lineno = nil) ⇒ String Also known as: <<

Append the given line. +lineno+ is one more than the last existing line, unless specified otherwise.



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# File 'lib/pry/code.rb', line 103

def push(line, lineno = nil)
  if lineno.nil?
    lineno = @lines.last.lineno + 1
  end
  @lines.push(LOC.new(line, lineno))
  line
end

#rawString

Return an unformatted String of the code.



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# File 'lib/pry/code.rb', line 303

def raw
  @lines.map(&:line).join("\n") << "\n"
end

#select {|LOC| ... } ⇒ Code

Filter the lines using the given block.

Yields:



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# File 'lib/pry/code.rb', line 116

def select(&block)
  alter do
    @lines = @lines.select(&block)
  end
end

#take_lines(start_line, num_lines) ⇒ Code

Take num_lines from start_line, forward or backwards.



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# File 'lib/pry/code.rb', line 144

def take_lines(start_line, num_lines)
  start_idx =
    if start_line >= 0
      @lines.index { |loc| loc.lineno >= start_line } || @lines.length
    else
      [@lines.length + start_line, 0].max
    end

  alter do
    @lines = @lines.slice(start_idx, num_lines)
  end
end

#to_sString



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# File 'lib/pry/code.rb', line 256

def to_s
  print_to_output("")
end

#with_indentation(spaces = 0) ⇒ Code

Format output with the specified number of spaces in front of every line, unless spaces is falsy.



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# File 'lib/pry/code.rb', line 237

def with_indentation(spaces = 0)
  alter do
    @with_indentation = !!spaces
    @indentation_num  = spaces
  end
end

#with_line_numbers(y_n = true) ⇒ Code

Format output with line numbers next to it, unless y_n is falsy.



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# File 'lib/pry/code.rb', line 214

def with_line_numbers(y_n = true)
  alter do
    @with_line_numbers = y_n
  end
end

#with_marker(lineno = 1) ⇒ Code

Format output with a marker next to the given +lineno+, unless +lineno+ is falsy.



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# File 'lib/pry/code.rb', line 225

def with_marker(lineno = 1)
  alter do
    @with_marker   = !!lineno
    @marker_lineno = lineno
  end
end