413 lines
14 KiB
Ruby
413 lines
14 KiB
Ruby
# frozen_string_literal: true
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class Pry
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##
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# Pry::Indent is a class that can be used to indent a number of lines
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# containing Ruby code similar as to how IRB does it (but better). The class
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# works by tokenizing a string using CodeRay and then looping over those
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# tokens. Based on the tokens in a line of code that line (or the next one)
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# will be indented or un-indented by correctly.
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#
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class Indent
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include Helpers::BaseHelpers
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# Raised if {#module_nesting} would not work.
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class UnparseableNestingError < StandardError; end
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# @return [String] String containing the spaces to be inserted before the next line.
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attr_reader :indent_level
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# @return [Array<String>] The stack of open tokens.
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attr_reader :stack
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# The amount of spaces to insert for each indent level.
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SPACES = ' '.freeze
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# Hash containing all the tokens that should increase the indentation
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# level. The keys of this hash are open tokens, the values the matching
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# tokens that should prevent a line from being indented if they appear on
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# the same line.
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OPEN_TOKENS = {
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'def' => 'end',
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'class' => 'end',
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'module' => 'end',
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'do' => 'end',
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'if' => 'end',
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'unless' => 'end',
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'while' => 'end',
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'until' => 'end',
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'for' => 'end',
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'case' => 'end',
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'begin' => 'end',
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'[' => ']',
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'{' => '}',
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'(' => ')'
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}.freeze
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# Which tokens can either be open tokens, or appear as modifiers on
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# a single-line.
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SINGLELINE_TOKENS = %w[if while until unless rescue].freeze
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# Which tokens can be followed by an optional "do" keyword.
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OPTIONAL_DO_TOKENS = %w[for while until].freeze
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# Collection of token types that should be ignored. Without this list
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# keywords such as "class" inside strings would cause the code to be
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# indented incorrectly.
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#
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# :pre_constant and :preserved_constant are the CodeRay 0.9.8 and 1.0.0
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# classifications of "true", "false", and "nil".
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IGNORE_TOKENS = %i[space content string method ident
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constant pre_constant predefined_constant].freeze
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# Tokens that indicate the end of a statement (i.e. that, if they appear
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# directly before an "if" indicates that that if applies to the same line,
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# not the next line)
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#
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# :reserved and :keywords are the CodeRay 0.9.8 and 1.0.0 respectively
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# classifications of "super", "next", "return", etc.
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STATEMENT_END_TOKENS = IGNORE_TOKENS + %i[regexp integer float
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keyword delimiter reserved
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instance_variable
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class_variable global_variable]
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# Collection of tokens that should appear dedented even though they
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# don't affect the surrounding code.
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MIDWAY_TOKENS = %w[when else elsif ensure rescue].freeze
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# Clean the indentation of a fragment of ruby.
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#
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# @param [String] str
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# @return [String]
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def self.indent(str)
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new.indent(str)
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end
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# Get the module nesting at the given point in the given string.
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#
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# NOTE If the line specified contains a method definition, then the nesting
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# at the start of the method definition is used. Otherwise the nesting from
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# the end of the line is used.
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#
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# @param [String] str The ruby code to analyze
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# @param [Fixnum] line_number The line number (starting from 1)
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# @return [Array<String>]
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def self.nesting_at(str, line_number)
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indent = new
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lines = str.split("\n")
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n = line_number - 1
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to_indent = lines[0...n] << (lines[n] || "").split("def").first(1)
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indent.indent(to_indent.join("\n") << "\n")
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indent.module_nesting
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end
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def initialize(pry_instance = Pry.new)
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@pry_instance = pry_instance
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reset
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end
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# reset internal state
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def reset
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@stack = []
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@indent_level = String.new # rubocop:disable Style/EmptyLiteral
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@heredoc_queue = []
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@close_heredocs = {}
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@string_start = nil
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@awaiting_class = false
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@module_nesting = []
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self
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end
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# Indents a string and returns it. This string can either be a single line
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# or multiple ones.
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#
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# @example
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# str = <<TXT
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# class User
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# attr_accessor :name
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# end
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# TXT
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#
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# # This would result in the following being displayed:
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# #
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# # class User
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# # attr_accessor :name
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# # end
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# #
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# puts Pry::Indent.new.indent(str)
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#
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# @param [String] input The input string to indent.
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# @return [String] The indented version of +input+.
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#
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def indent(input)
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output = ''
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prefix = indent_level
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input.lines.each do |line|
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if in_string?
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tokens = tokenize("#{open_delimiters_line}\n#{line}")
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tokens = tokens.drop_while do |token, _type|
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!(token.is_a?(String) && token.include?("\n"))
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end
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previously_in_string = true
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else
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tokens = tokenize(line)
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previously_in_string = false
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end
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before, after = indentation_delta(tokens)
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before.times { prefix.sub! SPACES, '' }
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new_prefix = prefix + SPACES * after
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line = prefix + line.lstrip unless previously_in_string
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output += line
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prefix = new_prefix
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end
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@indent_level = prefix
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output
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end
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# Get the indentation for the start of the next line.
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#
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# This is what's used between the prompt and the cursor in pry.
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#
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# @return String The correct number of spaces
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#
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def current_prefix
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in_string? ? '' : indent_level
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end
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# Get the change in indentation indicated by the line.
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#
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# By convention, you remove indent from the line containing end tokens,
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# but add indent to the line *after* that which contains the start tokens.
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#
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# This method returns a pair, where the first number is the number of closings
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# on this line (i.e. the number of indents to remove before the line) and the
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# second is the number of openings (i.e. the number of indents to add after
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# this line)
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#
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# @param [Array] tokens A list of tokens to scan.
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# @return [Array[Integer]]
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#
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def indentation_delta(tokens)
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# We need to keep track of whether we've seen a "for" on this line because
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# if the line ends with "do" then that "do" should be discounted (i.e. we're
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# only opening one level not two) To do this robustly we want to keep track
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# of the indent level at which we saw the for, so we can differentiate
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# between "for x in [1,2,3] do" and "for x in ([1,2,3].map do" properly
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seen_for_at = []
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# When deciding whether an "if" token is the start of a multiline statement,
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# or just the middle of a single-line if statement, we just look at the
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# preceding token, which is tracked here.
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last_token = nil
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last_kind = nil
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# delta keeps track of the total difference from the start of each line after
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# the given token, 0 is just the level at which the current line started for
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# reference.
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remove_before = 0
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add_after = 0
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# If the list of tokens contains a matching closing token the line should
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# not be indented (and thus we should return true).
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tokens.each do |token, kind|
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is_singleline_if =
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SINGLELINE_TOKENS.include?(token) && end_of_statement?(last_token, last_kind)
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is_optional_do = (token == "do" && seen_for_at.include?(add_after - 1))
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unless kind == :space
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last_token = token
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last_kind = kind
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end
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next if IGNORE_TOKENS.include?(kind)
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track_module_nesting(token, kind)
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seen_for_at << add_after if OPTIONAL_DO_TOKENS.include?(token)
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next if is_singleline_if
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if kind == :delimiter
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track_delimiter(token)
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elsif OPEN_TOKENS.key?(token) && !is_optional_do && !is_singleline_if
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@stack << token
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add_after += 1
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elsif token == OPEN_TOKENS[@stack.last]
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popped = @stack.pop
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track_module_nesting_end(popped)
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if add_after == 0
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remove_before += 1
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else
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add_after -= 1
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end
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elsif MIDWAY_TOKENS.include?(token)
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if add_after == 0
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remove_before += 1
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add_after += 1
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end
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end
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end
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[remove_before, add_after]
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end
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# If the code just before an "if" or "while" token on a line looks like the
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# end of a statement, then we want to treat that "if" as a singleline, not
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# multiline statement.
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def end_of_statement?(last_token, last_kind)
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(last_token =~ %r{^[)\]\}/]$} || STATEMENT_END_TOKENS.include?(last_kind))
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end
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# Are we currently in the middle of a string literal.
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#
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# This is used to determine whether to re-indent a given line, we mustn't
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# re-indent within string literals because to do so would actually change
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# the value of the String!
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#
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# @return Boolean
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def in_string?
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!open_delimiters.empty?
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end
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# Given a string of Ruby code, use CodeRay to export the tokens.
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#
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# @param [String] string The Ruby to lex
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# @return [Array] An Array of pairs of [token_value, token_type]
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def tokenize(string)
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tokens = SyntaxHighlighter.tokenize(string)
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tokens = tokens.tokens.each_slice(2) if tokens.respond_to?(:tokens) # Coderay 1.0.0
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tokens.to_a
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end
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# Update the internal state about what kind of strings are open.
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#
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# Most of the complication here comes from the fact that HEREDOCs can be
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# nested. For normal strings (which can't be nested) we assume that CodeRay
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# correctly pairs open-and-close delimiters so we don't bother checking what
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# they are.
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#
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# @param [String] token The token (of type :delimiter)
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def track_delimiter(token)
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case token
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when /^<<-(["'`]?)(.*)\\1/
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@heredoc_queue << token
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@close_heredocs[token] = /^\s*$2/
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when @close_heredocs[@heredoc_queue.first]
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@heredoc_queue.shift
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else
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@string_start = @string_start ? nil : token
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end
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end
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# All the open delimiters, in the order that they first appeared.
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#
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# @return [String]
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def open_delimiters
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@heredoc_queue + [@string_start].compact
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end
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# Return a string which restores the CodeRay string status to the correct value by
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# opening HEREDOCs and strings.
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#
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# @return String
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def open_delimiters_line
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"puts #{open_delimiters.join(', ')}"
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end
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# Update the internal state relating to module nesting.
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#
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# It's responsible for adding to the @module_nesting array, which looks
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# something like:
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#
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# [ ["class", "Foo"], ["module", "Bar::Baz"], ["class <<", "self"] ]
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#
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# A nil value in the @module_nesting array happens in two places: either
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# when @awaiting_class is true and we're still waiting for the string to
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# fill that space, or when a parse was rejected.
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#
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# At the moment this function is quite restricted about what formats it will
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# parse, for example we disallow expressions after the class keyword. This
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# could maybe be improved in the future.
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#
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# @param [String] token a token from Coderay
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# @param [Symbol] kind the kind of that token
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def track_module_nesting(token, kind)
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if kind == :keyword && %w[class module].include?(token)
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@module_nesting << [token, nil]
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@awaiting_class = true
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elsif @awaiting_class
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if kind == :operator && token == "<<" && @module_nesting.last[0] == "class"
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@module_nesting.last[0] = "class <<"
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@awaiting_class = true
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elsif kind == :class && token =~ /\A(self|[A-Z:][A-Za-z0-9_:]*)\z/
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@module_nesting.last[1] = token if kind == :class
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@awaiting_class = false
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else
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# leave @module_nesting[-1]
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@awaiting_class = false
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end
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end
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end
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# Update the internal state relating to module nesting on 'end'.
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#
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# If the current 'end' pairs up with a class or a module then we should
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# pop an array off of @module_nesting
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#
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# @param [String] token a token from Coderay
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# @param [Symbol] kind the kind of that token
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def track_module_nesting_end(token, kind = :keyword)
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@module_nesting.pop if kind == :keyword && %w[class module].include?(token)
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end
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# Return a list of strings which can be used to re-construct the Module.nesting at
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# the current point in the file.
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#
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# Returns nil if the syntax of the file was not recognizable.
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#
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# @return [Array<String>]
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def module_nesting
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@module_nesting.map do |(kind, token)|
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raise UnparseableNestingError, @module_nesting.inspect if token.nil?
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"#{kind} #{token}"
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end
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end
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# Return a string which, when printed, will rewrite the previous line with
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# the correct indentation. Mostly useful for fixing 'end'.
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#
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# @param [String] prompt The user's prompt
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# @param [String] code The code the user just typed in
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# @param [Integer] overhang The number of characters to erase afterwards (the
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# the difference in length between the old line and the new one)
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#
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# @return [String] correctly indented line
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def correct_indentation(prompt, code, overhang = 0)
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prompt = prompt.delete("\001\002")
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line_to_measure = Pry::Helpers::Text.strip_color(prompt) << code
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whitespace = ' ' * overhang
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cols = @pry_instance.output.width
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lines = cols == 0 ? 1 : (line_to_measure.length / cols + 1).to_i
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if Helpers::Platform.windows_ansi?
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move_up = "\e[#{lines}F"
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move_down = "\e[#{lines}E"
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else
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move_up = "\e[#{lines}A\e[0G"
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move_down = "\e[#{lines}B\e[0G"
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end
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"#{move_up}#{prompt}#{colorize_code(code)}#{whitespace}#{move_down}"
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end
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end
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end
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