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string.c: add String#delete_prefix and String#delete_prefix!

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to remove leading substr [Feature #12694] [fix GH-1632]

* string.c (rb_str_delete_prefix_bang): add a new method
  to remove prefix destuctively.

* string.c (rb_str_delete_prefix): add a new method
  to remove prefix non-destuctively.

* test/ruby/test_string.rb: add tests.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59132 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
sonots 2017-06-21 07:43:26 +00:00
parent 6af650256b
commit 10082360b9
3 changed files with 165 additions and 0 deletions
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95
test/ruby/test_string.rb
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@ -2416,6 +2416,101 @@ CODE
assert_equal("\u3042", s4)
end
def test_delete_prefix
assert_raise(TypeError) { 'hello'.delete_prefix(nil) }
assert_raise(TypeError) { 'hello'.delete_prefix(1) }
assert_raise(TypeError) { 'hello'.delete_prefix(/hel/) }
s = S("hello")
assert_equal("lo", s.delete_prefix('hel'))
assert_equal("hello", s)
s = S("hello")
assert_equal("hello", s.delete_prefix('lo'))
assert_equal("hello", s)
s = S("\u{3053 3093 306b 3061 306f}")
assert_equal("\u{306b 3061 306f}", s.delete_prefix("\u{3053 3093}"))
assert_equal("\u{3053 3093 306b 3061 306f}", s)
s = S("\u{3053 3093 306b 3061 306f}")
assert_equal("\u{3053 3093 306b 3061 306f}", s.delete_prefix('hel'))
assert_equal("\u{3053 3093 306b 3061 306f}", s)
s = S("hello")
assert_equal("hello", s.delete_prefix("\u{3053 3093}"))
assert_equal("hello", s)
# skip if argument is a broken string
s = S("\xe3\x81\x82")
assert_equal("\xe3\x81\x82", s.delete_prefix("\xe3"))
assert_equal("\xe3\x81\x82", s)
# clear coderange
s = S("\u{3053 3093}hello")
assert_not_predicate(s, :ascii_only?)
assert_predicate(s.delete_prefix("\u{3053 3093}"), :ascii_only?)
# argument should be converted to String
klass = Class.new {|klass| def to_str; 'a'; end }
s = S("abba")
assert_equal("bba", s.delete_prefix(klass.new))
assert_equal("abba", s)
end
def test_delete_prefix_bang
assert_raise(TypeError) { 'hello'.delete_prefix!(nil) }
assert_raise(TypeError) { 'hello'.delete_prefix!(1) }
assert_raise(TypeError) { 'hello'.delete_prefix!(/hel/) }
s = S("hello")
assert_equal("lo", s.delete_prefix!('hel'))
assert_equal("lo", s)
s = S("hello")
assert_equal(nil, s.delete_prefix!('lo'))
assert_equal("hello", s)
s = S("\u{3053 3093 306b 3061 306f}")
assert_equal("\u{306b 3061 306f}", s.delete_prefix!("\u{3053 3093}"))
assert_equal("\u{306b 3061 306f}", s)
s = S("\u{3053 3093 306b 3061 306f}")
assert_equal(nil, s.delete_prefix!('hel'))
assert_equal("\u{3053 3093 306b 3061 306f}", s)
s = S("hello")
assert_equal(nil, s.delete_prefix!("\u{3053 3093}"))
assert_equal("hello", s)
# skip if argument is a broken string
s = S("\xe3\x81\x82")
assert_equal(nil, s.delete_prefix!("\xe3"))
assert_equal("\xe3\x81\x82", s)
# clear coderange
s = S("\u{3053 3093}hello")
assert_not_predicate(s, :ascii_only?)
assert_predicate(s.delete_prefix!("\u{3053 3093}"), :ascii_only?)
# argument should be converted to String
klass = Class.new {|klass| def to_str; 'a'; end }
s = S("abba")
assert_equal("bba", s.delete_prefix!(klass.new))
assert_equal("bba", s)
s = S("ax").freeze
assert_raise_with_message(RuntimeError, /frozen/) {s.delete_prefix!("a")}
s = S("ax")
o = Struct.new(:s).new(s)
def o.to_str
s.freeze
"a"
end
assert_raise_with_message(RuntimeError, /frozen/) {s.delete_prefix!(o)}
end
=begin
def test_symbol_table_overflow
assert_in_out_err([], <<-INPUT, [], /symbol table overflow \(symbol [a-z]{8}\) \(RuntimeError\)/)