forked from rubocop/rubocop
/
util.rb
127 lines (102 loc) · 3.57 KB
/
util.rb
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# frozen_string_literal: true
module RuboCop
module Cop
# This module contains a collection of useful utility methods.
module Util
include PathUtil
# Match literal regex characters, not including anchors, character
# classes, alternatives, groups, repetitions, references, etc
LITERAL_REGEX =
%r{[\w\s\-,"'!#%&<>=;:`~/]|\\[^AbBdDgGhHkpPRwWXsSzZ0-9]}.freeze
module_function
def comment_line?(line_source)
line_source =~ /^\s*#/
end
def line_range(node)
node.first_line..node.last_line
end
def parentheses?(node)
node.loc.respond_to?(:end) && node.loc.end &&
node.loc.end.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 begins_its_line?(range)
(range.source_line =~ /\S/) == range.column
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
node = node.receiver
when :block
node = node.send_node
else
break
end
end
node
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
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 trim_string_interporation_escape_character(str)
str.gsub(/\\\#{(.*?)\}/) { "\#{#{Regexp.last_match(1)}}" }
end
def interpret_string_escapes(string)
StringInterpreter.interpret(string)
end
def same_line?(node1, node2)
node1.respond_to?(:loc) &&
node2.respond_to?(:loc) &&
node1.loc.line == node2.loc.line
end
def to_supported_styles(enforced_style)
enforced_style
.sub(/^Enforced/, 'Supported')
.sub('Style', 'Styles')
end
def tokens(node)
@tokens ||= {}
return @tokens[node.object_id] if @tokens[node.object_id]
source_range = node.source_range
begin_pos = source_range.begin_pos
end_pos = source_range.end_pos
@tokens[node.object_id] = processed_source.tokens.select do |token|
token.end_pos <= end_pos && token.begin_pos >= begin_pos
end
end
private
def compatible_external_encoding_for?(src)
src = src.dup if RUBY_ENGINE == 'jruby'
src.force_encoding(Encoding.default_external).valid_encoding?
end
end
end
end