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pry--pry/lib/pry/code.rb

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require 'pry/code/loc'
require 'pry/code/code_range'
require 'pry/code/code_file'
class Pry
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class << self
# Convert the given object into an instance of `Pry::Code`, if it isn't
# already one.
#
# @param [Code, Method, UnboundMethod, Proc, Pry::Method, String, Array,
# IO] obj
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def Code(obj)
case obj
when Code
obj
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when ::Method, UnboundMethod, Proc, Pry::Method
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Code.from_method(obj)
else
Code.new(obj)
end
end
end
# `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.
class Code
class << self
include MethodSource::CodeHelpers
# Instantiate a `Code` object containing code loaded from a file or
# Pry's line buffer.
#
# @param [String] filename The name of a file, or "(pry)".
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# @param [Symbol] code_type The type of code the file contains.
# @return [Code]
def from_file(filename, code_type = nil)
code_file = CodeFile.new(filename, code_type)
new(code_file.code, 1, code_file.code_type)
end
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# Instantiate a `Code` object containing code extracted from a
# `::Method`, `UnboundMethod`, `Proc`, or `Pry::Method` object.
#
# @param [::Method, UnboundMethod, Proc, Pry::Method] meth The method
# object.
# @param [Integer, nil] start_line The line number to start on, or nil to
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# use the method's original line numbers.
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# @return [Code]
def from_method(meth, start_line = nil)
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meth = Pry::Method(meth)
start_line ||= meth.source_line || 1
new(meth.source, start_line, meth.source_type)
end
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# Attempt to extract the source code for module (or class) `mod`.
#
# @param [Module, Class] mod The module (or class) of interest.
# @param [Integer] candidate_rank The module candidate (by rank)
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# to use (see `Pry::WrappedModule::Candidate` for more information).
# @param [Integer, nil] start_line The line number to start on, or nil to
# use the method's original line numbers.
# @return [Code]
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
end
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# @return [Symbol] The type of code stored in this wrapper.
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attr_accessor :code_type
# 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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# @param [Array<String>, String, IO] lines
# @param [Integer?] start_line
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# @param [Symbol?] code_type
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
# Append the given line. +lineno+ is one more than the last existing
# line, unless specified otherwise.
#
# @param [String] line
# @param [Integer?] lineno
# @return [String] The inserted line.
def push(line, lineno = nil)
if lineno.nil?
lineno = @lines.last.lineno + 1
end
@lines.push(LOC.new(line, lineno))
line
end
alias << push
# Filter the lines using the given block.
#
# @yield [LOC]
# @return [Code]
def select(&block)
alter do
@lines = @lines.select(&block)
end
end
# 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.
#
# @param [Range, Integer] start_line
# @param [Integer?] end_line
# @return [Code]
def between(start_line, end_line = nil)
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return self unless start_line
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code_range = CodeRange.new(start_line, end_line)
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alter do
@lines = @lines[code_range.indices_range(@lines)] || []
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end
end
# Take `num_lines` from `start_line`, forward or backwards.
#
# @param [Integer] start_line
# @param [Integer] num_lines
# @return [Code]
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
# Remove all lines except for the +lines+ up to and excluding +lineno+.
#
# @param [Integer] lineno
# @param [Integer] lines
# @return [Code]
def before(lineno, lines = 1)
return self unless lineno
select do |loc|
loc.lineno >= lineno - lines && loc.lineno < lineno
end
end
# Remove all lines except for the +lines+ on either side of and including
# +lineno+.
#
# @param [Integer] lineno
# @param [Integer] lines
# @return [Code]
def around(lineno, lines = 1)
return self unless lineno
select do |loc|
loc.lineno >= lineno - lines && loc.lineno <= lineno + lines
end
end
# Remove all lines except for the +lines+ after and excluding +lineno+.
#
# @param [Integer] lineno
# @param [Integer] lines
# @return [Code]
def after(lineno, lines = 1)
return self unless lineno
select do |loc|
loc.lineno > lineno && loc.lineno <= lineno + lines
end
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end
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# Remove all lines that don't match the given `pattern`.
#
# @param [Regexp] pattern
# @return [Code]
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def grep(pattern)
return self unless pattern
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pattern = Regexp.new(pattern)
select do |loc|
loc.line =~ pattern
end
end
# Format output with line numbers next to it, unless `y_n` is falsy.
#
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# @param [Boolean?] y_n
# @return [Code]
def with_line_numbers(y_n = true)
alter do
@with_line_numbers = y_n
end
end
# Format output with a marker next to the given +lineno+, unless +lineno+ is
# falsy.
#
# @param [Integer?] lineno
# @return [Code]
def with_marker(lineno = 1)
alter do
@with_marker = !!lineno
@marker_lineno = lineno
end
end
# Format output with the specified number of spaces in front of every line,
# unless `spaces` is falsy.
#
# @param [Integer?] spaces
# @return [Code]
def with_indentation(spaces = 0)
alter do
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@with_indentation = !!spaces
@indentation_num = spaces
end
end
# @return [String]
def inspect
Object.instance_method(:to_s).bind(self).call
end
# @return [Integer] the number of digits in the last line.
def max_lineno_width
@lines.length > 0 ? @lines.last.lineno.to_s.length : 0
end
# @return [String] a formatted representation (based on the configuration of
# the object).
def to_s
print_to_output("", false)
end
# @return [String] a (possibly highlighted) copy of the source code.
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def highlighted
print_to_output("", true)
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end
# Writes a formatted representation (based on the configuration of the
# object) to the given output, which must respond to `#<<`.
def print_to_output(output, color=false)
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@lines.each do |loc|
loc = loc.dup
loc.colorize(@code_type) if color
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loc.add_line_number(max_lineno_width, color) if @with_line_numbers
loc.add_marker(@marker_lineno) if @with_marker
loc.indent(@indentation_num) if @with_indentation
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output << loc.line
output << "\n"
end
output
end
# Get the comment that describes the expression on the given line number.
#
# @param [Integer] line_number (1-based)
# @return [String] the code.
def comment_describing(line_number)
self.class.comment_describing(raw, line_number)
end
# Get the multiline expression that starts on the given line number.
#
# @param [Integer] line_number (1-based)
# @return [String] the code.
def expression_at(line_number, consume = 0)
self.class.expression_at(raw, line_number, :consume => consume)
end
# Get the (approximate) Module.nesting at the give line number.
#
# @param [Integer] line_number line number starting from 1
# @param [Module] top_module the module in which this code exists
# @return [Array<Module>] a list of open modules.
def nesting_at(line_number, top_module = Object)
Pry::Indent.nesting_at(raw, line_number)
end
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# Return an unformatted String of the code.
#
# @return [String]
def raw
@lines.map(&:line).join("\n") << "\n"
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end
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# Return the number of lines stored.
#
# @return [Integer]
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def length
@lines ? @lines.length : 0
end
# Two `Code` objects are equal if they contain the same lines with the same
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# numbers. Otherwise, call `to_s` and `chomp` and compare as Strings.
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#
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# @param [Code, Object] other
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# @return [Boolean]
def ==(other)
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if other.is_a?(Code)
other_lines = other.instance_variable_get(:@lines)
@lines.each_with_index.all? { |loc, i| loc == other_lines[i] }
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else
to_s.chomp == other.to_s.chomp
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end
end
# Forward any missing methods to the output of `#to_s`.
def method_missing(name, *args, &block)
to_s.send(name, *args, &block)
end
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undef =~
protected
# An abstraction of the `dup.instance_eval` pattern used throughout this
# class.
def alter(&block)
dup.tap { |o| o.instance_eval(&block) }
end
end
end