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# frozen_string_literal: true
# rubocop:disable Metrics/ModuleLength
module RuboCop
module Cop
# This module contains a collection of useful utility methods.
module Util
include PathUtil
extend RuboCop::AST::Sexp
BYTE_ORDER_MARK = 0xfeff # The Unicode codepoint
EQUALS_ASGN_NODES = [:lvasgn, :ivasgn, :cvasgn, :gvasgn,
:casgn, :masgn].freeze
SHORTHAND_ASGN_NODES = [:op_asgn, :or_asgn, :and_asgn].freeze
ASGN_NODES = (EQUALS_ASGN_NODES + SHORTHAND_ASGN_NODES).freeze
MODIFIER_NODES = [:if, :while, :until].freeze
CONDITIONAL_NODES = (MODIFIER_NODES + [:case]).freeze
LOGICAL_OPERATOR_NODES = [:and, :or].freeze
# http://phrogz.net/programmingruby/language.html#table_18.4
# Backtick is added last just to help editors parse this code.
OPERATOR_METHODS = %w(
| ^ & <=> == === =~ > >= < <= << >>
+ - * / % ** ~ +@ -@ [] []= ! != !~
).map(&:to_sym).push(:'`').freeze
# Match literal regex characters, not including anchors, character
# classes, alternatives, groups, repetitions, references, etc
LITERAL_REGEX = /[\w\s\-,"'!#%&<>=;:`~]|\\[^AbBdDgGhHkpPRwWXsSzZ0-9]/
module_function
def operator?(symbol)
OPERATOR_METHODS.include?(symbol)
end
def strip_quotes(str)
if str[0] == '"' || str[0] == "'"
str[0] = ''
else
# we're dealing with %q or %Q
str[0, 3] = ''
end
str[-1] = ''
str
end
def block_length(block_node)
block_node.loc.end.line - block_node.loc.begin.line
end
def comment_line?(line_source)
line_source =~ /^\s*#/
end
def line_range(arg)
source_range = case arg
when Parser::Source::Range
arg
when Parser::AST::Node
arg.source_range
else
raise ArgumentError, "Invalid argument #{arg}"
end
source_range.begin.line..source_range.end.line
end
def parentheses?(node)
node.loc.respond_to?(:end) && node.loc.end &&
node.loc.end.is?(')'.freeze)
end
def parenthesized_call?(send)
send.loc.begin && send.loc.begin.is?('(')
end
def on_node(syms, sexp, excludes = [], &block)
return to_enum(:on_node, syms, sexp, excludes) unless block_given?
yield sexp if Array(syms).include?(sexp.type)
return if Array(excludes).include?(sexp.type)
sexp.each_child_node { |elem| on_node(syms, elem, excludes, &block) }
end
def source_range(source_buffer, line_number, column, length = 1)
if column.is_a?(Range)
column_index = column.begin
length = numeric_range_size(column)
else
column_index = column
end
line_begin_pos = if line_number.zero?
0
else
source_buffer.line_range(line_number).begin_pos
end
begin_pos = line_begin_pos + column_index
end_pos = begin_pos + length
Parser::Source::Range.new(source_buffer, begin_pos, end_pos)
end
# Returns the column attribute of the range, except if the range is on
# the first line and there's a byte order mark at the beginning of that
# line, in which case 1 is subtracted from the column value. This gives
# the column as it appears when viewing the file in an editor.
def effective_column(range)
if range.line == 1 &&
@processed_source.raw_source.codepoints.first == BYTE_ORDER_MARK
range.column - 1
else
range.column
end
end
def range_between(start_pos, end_pos)
Parser::Source::Range.new(processed_source.buffer, start_pos, end_pos)
end
def range_with_surrounding_comma(range, side = :both)
buffer = @processed_source.buffer
src = buffer.source
go_left, go_right = directions(side)
begin_pos = range.begin_pos
end_pos = range.end_pos
begin_pos = move_pos(src, begin_pos, -1, go_left, /,/)
end_pos = move_pos(src, end_pos, 1, go_right, /,/)
Parser::Source::Range.new(buffer, begin_pos, end_pos)
end
def range_with_surrounding_space(range, side = :both, with_newline = true)
buffer = @processed_source.buffer
src = buffer.source
go_left, go_right = directions(side)
begin_pos = range.begin_pos
end_pos = range.end_pos
begin_pos = move_pos(src, begin_pos, -1, go_left, /[ \t]/)
begin_pos = move_pos(src, begin_pos, -1, go_left && with_newline, /\n/)
end_pos = move_pos(src, end_pos, 1, go_right, /[ \t]/)
end_pos = move_pos(src, end_pos, 1, go_right && with_newline, /\n/)
Parser::Source::Range.new(buffer, begin_pos, end_pos)
end
def move_pos(src, pos, step, condition, regexp)
offset = step == -1 ? -1 : 0
pos += step while condition && src[pos + offset] =~ regexp
pos < 0 ? 0 : pos
end
def directions(side)
if side == :both
[true, true]
else
[side == :left, side == :right]
end
end
def begins_its_line?(range)
(range.source_line =~ /\S/) == range.column
end
def ends_its_line?(range)
line = range.source_buffer.source_line(range.last_line)
(line =~ /\s*\z/) == range.last_column
end
def within_node?(inner, outer)
o = outer.is_a?(AST::Node) ? outer.source_range : outer
i = inner.is_a?(AST::Node) ? inner.source_range : inner
i.begin_pos >= o.begin_pos && i.end_pos <= o.end_pos
end
# Returns, for example, a bare `if` node if the given node is an `if`
# with calls chained to the end of it.
def first_part_of_call_chain(node)
while node
case node.type
when :send
receiver, _method_name, _args = *node
node = receiver
when :block
method, _args, _body = *node
node = method
else
break
end
end
node
end
# Range#size is not available prior to Ruby 2.0.
def numeric_range_size(range)
size = range.end - range.begin
size += 1 unless range.exclude_end?
size = 0 if size < 0
size
end
# If converting a string to Ruby string literal source code, must
# double quotes be used?
def double_quotes_required?(string)
# Double quotes are required for strings which either:
# - Contain single quotes
# - Contain non-printable characters, which must use an escape
# Regex matches IF there is a ' or there is a \\ in the string that is
# not preceded/followed by another \\ (e.g. "\\x34") but not "\\\\".
string =~ /'|(?<! \\) \\{2}* \\ (?![\\"])/x
end
# If double quoted string literals are found in Ruby code, and they are
# not the preferred style, should they be flagged?
def double_quotes_acceptable?(string)
needs_escaping?(string) || hard_to_type?(string)
end
def hard_to_type?(string)
string.codepoints.any? { |cp| cp < 32 || cp > 126 }
end
def needs_escaping?(string)
double_quotes_required?(escape_string(string))
end
def escape_string(string)
string.inspect[1..-2].tap { |s| s.gsub!(/\\"/, '"') }
end
def to_string_literal(string)
if needs_escaping?(string) && compatible_external_encoding_for?(string)
string.inspect
else
"'#{string.gsub('\\') { '\\\\' }}'"
end
end
def to_symbol_literal(string)
":#{string.to_sym}"
end
def interpret_string_escapes(string)
StringInterpreter.interpret(string)
end
def same_line?(n1, n2)
n1.respond_to?(:loc) &&
n2.respond_to?(:loc) &&
n1.loc.line == n2.loc.line
end
def line_distance(n1, n2)
n2.loc.line - n1.loc.line
end
def preceed?(n1, n2)
line_distance(n1, n2) == 1
end
def stripped_source_upto(line)
processed_source[0..line].map(&:strip)
end
def compatible_external_encoding_for?(src)
src = src.dup if RUBY_VERSION < '2.3'
src.force_encoding(Encoding.default_external).valid_encoding?
end
def to_supported_styles(enforced_style)
enforced_style
.sub(/^Enforced/, 'Supported')
.sub('Style', 'Styles')
end
end
end
end