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# frozen_string_literal: true
require_relative "test_helper"
return if RUBY_VERSION < "3.1.0" || Prism::BACKEND == :FFI
module Prism
class UnescapeTest < TestCase
module Context
class Base
attr_reader :left, :right
def initialize(left, right)
@left = left
@right = right
end
def name
"#{left}#{right}".delete("\n")
end
private
def code(escape)
"#{left}\\#{escape}#{right}".b
end
def ruby(escape)
previous, $VERBOSE = $VERBOSE, nil
begin
yield eval(code(escape))
rescue SyntaxError
:error
ensure
$VERBOSE = previous
end
end
def prism(escape)
result = Prism.parse(code(escape))
if result.success?
yield result.value.statements.body.first
else
:error
end
end
def `(command)
command
end
end
class List < Base
def ruby_result(escape)
ruby(escape) { |value| value.first.to_s }
end
def prism_result(escape)
prism(escape) { |node| node.elements.first.unescaped }
end
end
class Symbol < Base
def ruby_result(escape)
ruby(escape, &:to_s)
end
def prism_result(escape)
prism(escape, &:unescaped)
end
end
class String < Base
def ruby_result(escape)
ruby(escape, &:itself)
end
def prism_result(escape)
prism(escape, &:unescaped)
end
end
class Heredoc < Base
def ruby_result(escape)
ruby(escape, &:itself)
end
def prism_result(escape)
prism(escape) do |node|
case node.type
when :interpolated_string_node, :interpolated_x_string_node
node.parts.flat_map(&:unescaped).join
else
node.unescaped
end
end
end
end
class RegExp < Base
def ruby_result(escape)
ruby(escape, &:source)
end
def prism_result(escape)
prism(escape, &:unescaped)
end
end
end
def test_char; assert_context(Context::String.new("?", "")); end
def test_sqte; assert_context(Context::String.new("'", "'")); end
def test_dqte; assert_context(Context::String.new("\"", "\"")); end
def test_lwrq; assert_context(Context::String.new("%q[", "]")); end
def test_uprq; assert_context(Context::String.new("%Q[", "]")); end
def test_dstr; assert_context(Context::String.new("%[", "]")); end
def test_xstr; assert_context(Context::String.new("`", "`")); end
def test_lwrx; assert_context(Context::String.new("%x[", "]")); end
def test_h0_1; assert_context(Context::String.new("<<H\n", "\nH")); end
def test_h0_2; assert_context(Context::String.new("<<'H'\n", "\nH")); end
def test_h0_3; assert_context(Context::String.new("<<\"H\"\n", "\nH")); end
def test_h0_4; assert_context(Context::String.new("<<`H`\n", "\nH")); end
def test_hd_1; assert_context(Context::String.new("<<-H\n", "\nH")); end
def test_hd_2; assert_context(Context::String.new("<<-'H'\n", "\nH")); end
def test_hd_3; assert_context(Context::String.new("<<-\"H\"\n", "\nH")); end
def test_hd_4; assert_context(Context::String.new("<<-`H`\n", "\nH")); end
def test_ht_1; assert_context(Context::Heredoc.new("<<~H\n", "\nH")); end
def test_ht_2; assert_context(Context::Heredoc.new("<<~'H'\n", "\nH")); end
def test_ht_3; assert_context(Context::Heredoc.new("<<~\"H\"\n", "\nH")); end
def test_ht_4; assert_context(Context::Heredoc.new("<<~`H`\n", "\nH")); end
def test_pw_1; assert_context(Context::List.new("%w[", "]")); end
def test_pw_2; assert_context(Context::List.new("%w<", ">")); end
def test_uprw; assert_context(Context::List.new("%W[", "]")); end
def test_lwri; assert_context(Context::List.new("%i[", "]")); end
def test_upri; assert_context(Context::List.new("%I[", "]")); end
def test_lwrs; assert_context(Context::Symbol.new("%s[", "]")); end
def test_sym1; assert_context(Context::Symbol.new(":'", "'")); end
def test_sym2; assert_context(Context::Symbol.new(":\"", "\"")); end
def test_reg1; assert_context(Context::RegExp.new("/", "/")); end
def test_reg2; assert_context(Context::RegExp.new("%r[", "]")); end
def test_reg3; assert_context(Context::RegExp.new("%r<", ">")); end
def test_reg4; assert_context(Context::RegExp.new("%r{", "}")); end
def test_reg5; assert_context(Context::RegExp.new("%r(", ")")); end
def test_reg6; assert_context(Context::RegExp.new("%r|", "|")); end
private
def assert_context(context)
octal = [*("0".."7")]
hex = [*("a".."f"), *("A".."F"), *("0".."9")]
(0...256).each do |ord|
# I think this might be a bug in Ruby.
next if context.name == "?" && ord == 0xFF
# We don't currently support scanning for the number of capture groups
# to validate backreferences so these are all going to fail.
next if (context.name == "//" || context.name.start_with?("%r")) && ord.chr.start_with?(/\d/)
# \a \b \c ...
assert_unescape(context, ord.chr)
end
# \\r\n
assert_unescape(context, "\r\n")
# We don't currently support scanning for the number of capture groups to
# validate backreferences so these are all going to fail.
if context.name != "//" && !context.name.start_with?("%r")
# \00 \01 \02 ...
octal.product(octal).each { |digits| assert_unescape(context, digits.join) }
# \000 \001 \002 ...
octal.product(octal).product(octal).each { |digits| assert_unescape(context, digits.join) }
end
# \x0 \x1 \x2 ...
hex.each { |digit| assert_unescape(context, "x#{digit}") }
# \x00 \x01 \x02 ...
hex.product(hex).each { |digits| assert_unescape(context, "x#{digits.join}") }
# \u0000 \u0001 \u0002 ...
assert_unescape(context, "u#{["5"].concat(hex.sample(3)).join}")
# The behavior of whitespace in the middle of these escape sequences
# changed in Ruby 3.3.0, so we only want to test against latest.
if RUBY_VERSION >= "3.3.0"
# \u{00 00} ...
assert_unescape(context, "u{00#{["5"].concat(hex.sample(3)).join} \t\v 00#{["5"].concat(hex.sample(3)).join}}")
end
(0...128).each do |ord|
chr = ord.chr
next if chr == "\\" || !chr.match?(/[[:print:]]/)
# \C-a \C-b \C-c ...
assert_unescape(context, "C-#{chr}")
# \ca \cb \cc ...
assert_unescape(context, "c#{chr}")
# \M-a \M-b \M-c ...
assert_unescape(context, "M-#{chr}")
# \M-\C-a \M-\C-b \M-\C-c ...
assert_unescape(context, "M-\\C-#{chr}")
# \M-\ca \M-\cb \M-\cc ...
assert_unescape(context, "M-\\c#{chr}")
# \c\M-a \c\M-b \c\M-c ...
assert_unescape(context, "c\\M-#{chr}")
end
end
def assert_unescape(context, escape)
expected = context.ruby_result(escape)
actual = context.prism_result(escape)
message = -> do
"Expected #{context.name} to unescape #{escape.inspect} to " \
"#{expected.inspect}, but got #{actual.inspect}"
end
if expected == :error || actual == :error
assert_equal expected, actual, message
else
assert_equal expected.bytes, actual.bytes, message
end
end
end
end
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