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add DString.insert_at (#1026)

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* add DString.insert
* make conv::utf32to8 more C3-like
This commit is contained in:
Pierre Curto
2023-10-05 19:12:47 +02:00
committed by GitHub
parent d16ad0b4c7
commit 9643a7c2b2
4 changed files with 118 additions and 48 deletions
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64
test/unit/stdlib/core/dstring.c3 Normal file
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@@ -0,0 +1,64 @@
module std::core::dstring::tests @test;
fn void test_insert_at()
{
DString str = dstring::tnew(" world");
String s;
str.insert_at(0, "");
s = str.str_view();
assert(s == " world", "got '%s'; want ' world'", s);
str.insert_at(0, "hello");
s = str.str_view();
assert(s == "hello world", "got '%s'; want 'hello world'", s);
str.insert_at(5, " shiny");
s = str.str_view();
assert(s == "hello shiny world", "got '%s'; want 'hello shiny world'", s);
}
fn void test_insert_at_overlaps()
{
DString str = dstring::tnew("abc");
String s;
String v;
str.insert_at(0, "bc");
s = str.str_view();
assert(s == "bcabc", "got '%s'; want 'bcabc'", s);
// Inserted string is unchanged.
str.chop(0);
str.append("abc");
v = str.str_view();
str.insert_at(0, v);
s = str.str_view();
assert(s == "abc", "got '%s'; want 'abc'", s);
// Inserted string is part of the tail.
str.chop(0);
str.append("abc");
v = str.str_view()[1..];
assert(v == "bc");
str.insert_at(0, v);
s = str.str_view();
assert(s == "bcabc", "got '%s'; want 'bcabc'", s);
// Inserted string is part of the head.
str.chop(0);
str.append("abc");
v = str.str_view()[1..];
str.insert_at(2, v);
s = str.str_view();
assert(s == "abbcc", "got '%s'; want 'abbcc'", s);
str.chop(0);
str.append("abcdef");
v = str.str_view()[3..];
assert(v == "def");
str.insert_at(0, v);
str.chop(3);
s = str.str_view();
assert(s == "def", "got '%s'; want 'def'", s);
}