Add dchar constructor
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@ -12,6 +12,7 @@
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*/
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module tanya.container.string;
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import core.checkedint;
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import core.exception;
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import core.stdc.string;
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import std.algorithm.comparison;
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@ -22,158 +23,213 @@ import tanya.memory;
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*/
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struct String
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{
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private size_t length_;
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private char* data;
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private size_t capacity_;
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private size_t length_;
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private char* data;
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private size_t capacity_;
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invariant
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{
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assert(length_ <= capacity_);
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}
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invariant
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{
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assert(length_ <= capacity_);
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}
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/**
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* Params:
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* str = Initial string.
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* allocator = Allocator.
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*/
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this(const(char)[] str, shared Allocator allocator = defaultAllocator)
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nothrow @trusted @nogc
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{
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this(allocator);
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reserve(str.length);
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length_ = str.length;
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memcpy(data, str.ptr, length_);
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}
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/// Ditto.
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this(const(wchar)[] str, shared Allocator allocator = defaultAllocator)
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nothrow @trusted @nogc
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{
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this(allocator);
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}
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/// Ditto.
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this(const(dchar)[] str, shared Allocator allocator = defaultAllocator)
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nothrow @trusted @nogc
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{
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this(allocator);
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bool overflow;
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auto size = mulu(str.length, 4, overflow);
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assert(!overflow);
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reserve(size);
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auto s = data;
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foreach (c; str)
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{
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if (c < 0x80)
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{
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*s++ = c & 0x7f;
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length_ += 1;
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}
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else if (c < 0x800)
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{
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*s++ = 0xc0 | (c >> 6) & 0xff;
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*s++ = 0x80 | (c & 0x3f);
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length_ += 2;
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}
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else if (c < 0xd800 || c - 0xe000 < 0x2000)
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{
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*s++ = 0xe0 | (c >> 12) & 0xff;
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*s++ = 0x80 | ((c >> 6) & 0x3f);
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*s++ = 0x80 | (c & 0x3f);
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length_ += 3;
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}
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else if (c - 0x10000 < 0x100000)
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{
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*s++ = 0xf0 | (c >> 18);
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*s++ = 0x80 | ((c >> 12) & 0x3f);
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*s++ = 0x80 | ((c >> 6) & 0x3f);
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*s++ = 0x80 | (c & 0x3f);
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length_ += 4;
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}
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}
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}
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///
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@nogc @safe unittest
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{
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auto s = String("Отказаться от вина - в этом страшная вина."d);
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assert("Отказаться от вина - в этом страшная вина." == s.get);
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}
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/// Ditto.
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this(shared Allocator allocator) pure nothrow @safe @nogc
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in
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{
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assert(allocator !is null);
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}
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body
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{
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allocator_ = allocator;
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}
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/**
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* Destroys the string.
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*/
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~this() nothrow @trusted @nogc
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{
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allocator.deallocate(data[0 .. capacity_]);
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}
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/**
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* Reserves $(D_PARAM size) bytes for the string.
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*
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* If $(D_PARAM size) is less than or equal to the $(D_PSYMBOL capacity), the
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* function call does not cause a reallocation and the string capacity is not
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* affected.
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*
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* Params:
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* size = Desired size in bytes.
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*/
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void reserve(in size_t size) nothrow @trusted @nogc
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{
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if (capacity_ >= size)
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{
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return;
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}
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void[] buf = data[0 .. capacity_];
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if (!allocator.reallocate(buf, size))
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{
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onOutOfMemoryErrorNoGC();
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}
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data = cast(char*) buf;
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capacity_ = size;
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}
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///
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@nogc @safe unittest
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{
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String s;
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assert(s.capacity == 0);
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s.reserve(3);
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assert(s.capacity == 3);
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s.reserve(3);
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assert(s.capacity == 3);
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s.reserve(1);
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assert(s.capacity == 3);
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}
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/**
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* Requests the string to reduce its capacity to fit the $(D_PARAM size).
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*
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* The request is non-binding. The string won't become smaller than the
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* string byte length.
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*
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* Params:
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* size = Desired size.
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*/
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void shrink(in size_t size) nothrow @trusted @nogc
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{
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if (capacity_ <= size)
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{
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return;
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}
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immutable n = max(length_, size);
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void[] buf = data[0 .. capacity_];
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if (allocator.reallocate(buf, size))
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{
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capacity_ = n;
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data = cast(char*) buf;
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}
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}
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///
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@nogc @safe unittest
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{
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auto s = String("Die Alten lasen laut.");
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assert(s.capacity == 21);
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s.reserve(30);
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s.shrink(25);
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assert(s.capacity == 25);
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s.shrink(18);
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assert(s.capacity == 21);
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}
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/**
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* Returns: String capacity in bytes.
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*/
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@property size_t capacity() const pure nothrow @safe @nogc
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{
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return capacity_;
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}
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///
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@nogc @safe unittest
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{
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auto s = String("In allem Schreiben ist Schamlosigkeit.");
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assert(s.capacity == 38);
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}
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/**
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* Params:
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* str = Initial string.
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* allocator = Allocator.
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*/
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this(const(char)[] str, shared Allocator allocator = defaultAllocator)
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nothrow @trusted @nogc
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{
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this(allocator);
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reserve(str.length);
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length_ = str.length;
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memcpy(data, str.ptr, length_);
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}
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/// Ditto.
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this(const(wchar)[] str, shared Allocator allocator = defaultAllocator)
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nothrow @trusted @nogc
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{
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this(allocator);
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}
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/// Ditto.
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this(const(dchar)[] str, shared Allocator allocator = defaultAllocator)
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nothrow @trusted @nogc
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{
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this(allocator);
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}
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/// Ditto.
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this(shared Allocator allocator) pure nothrow @safe @nogc
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in
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{
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assert(allocator !is null);
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}
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body
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{
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allocator_ = allocator;
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}
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/**
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* Destroys the string.
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*/
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~this() nothrow @trusted @nogc
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{
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allocator.deallocate(data[0 .. capacity_]);
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}
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/**
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* Reserves $(D_PARAM size) bytes for the string.
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* Returns an array used internally by the string.
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* The length of the returned array may be smaller than the size of the
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* reserved memory for the string.
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*
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* If $(D_PARAM size) is less than or equal to the $(D_PSYMBOL capacity), the
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* function call does not cause a reallocation and the string capacity is not
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* affected.
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*
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* Params:
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* size = Desired size in bytes.
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* Returns: The array representing the string.
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*/
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void reserve(in size_t size) nothrow @trusted @nogc
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{
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if (capacity_ >= size)
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{
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return;
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}
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inout(char[]) get() inout pure nothrow @trusted @nogc
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{
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return data[0 .. length_];
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}
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void[] buf = data[0 .. capacity_];
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if (!allocator.reallocate(buf, size))
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{
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onOutOfMemoryErrorNoGC();
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}
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data = cast(char*) buf;
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capacity_ = size;
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}
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///
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@nogc @safe unittest
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{
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String s;
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assert(s.capacity == 0);
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s.reserve(3);
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assert(s.capacity == 3);
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s.reserve(3);
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assert(s.capacity == 3);
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s.reserve(1);
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assert(s.capacity == 3);
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}
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/**
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* Requests the string to reduce its capacity to fit the $(D_PARAM size).
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*
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* The request is non-binding. The string won't become smaller than the
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* string byte length.
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*
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* Params:
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* size = Desired size.
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*/
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void shrink(in size_t size) nothrow @trusted @nogc
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{
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if (capacity_ <= size)
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{
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return;
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}
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immutable n = max(length_, size);
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void[] buf = data[0 .. capacity_];
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if (allocator.reallocate(buf, size))
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{
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capacity_ = n;
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data = cast(char*) buf;
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}
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}
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///
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@nogc @safe unittest
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{
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auto s = String("Die Alten lasen laut.");
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assert(s.capacity == 21);
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s.reserve(30);
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s.shrink(25);
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assert(s.capacity == 25);
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s.shrink(18);
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assert(s.capacity == 21);
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}
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/**
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* Returns: String capacity in bytes.
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*/
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@property size_t capacity() const pure nothrow @safe @nogc
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{
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return capacity_;
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}
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///
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@nogc @safe unittest
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{
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auto s = String("In allem Schreiben ist Schamlosigkeit.");
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assert(s.capacity == 38);
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}
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mixin DefaultAllocator;
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mixin DefaultAllocator;
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}
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