Eugen Wissner
ce90b4865b
This commit adds tanya.range.array module which contains functions to make the arrays act as ranges. These functions don't do any auto-decoding for strings.
1596 lines
39 KiB
D
1596 lines
39 KiB
D
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/**
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* UTF-8 encoded string.
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*
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* You can create a $(D_PSYMBOL String) from a literal string, single character
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* or character range. Characters can be of the type $(D_KEYWORD char),
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* $(D_KEYWORD wchar) or $(D_KEYWORD dchar). Literal strings, characters and
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* character ranges can be also inserted into an existing string.
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*
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* $(D_PSYMBOL String) is always valid UTF-8. Inserting an invalid sequence
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* or working on a corrupted $(D_PSYMBOL String) causes
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* $(D_PSYMBOL UTFException) to be thrown.
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*
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* Internally $(D_PSYMBOL String) is represented by a sequence of
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* $(D_KEYWORD char)s.
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*
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* Copyright: Eugene Wissner 2017.
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* License: $(LINK2 https://www.mozilla.org/en-US/MPL/2.0/,
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* Mozilla Public License, v. 2.0).
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* Authors: $(LINK2 mailto:info@caraus.de, Eugene Wissner)
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* Source: $(LINK2 https://github.com/caraus-ecms/tanya/blob/master/source/tanya/container/string.d,
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* tanya/container/string.d)
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*/
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module tanya.container.string;
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import core.exception;
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import std.algorithm.comparison;
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import std.algorithm.mutation;
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import std.algorithm.searching;
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import std.range : isInfinite, isInputRange, ElementEncodingType, hasLength,
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popFrontN, empty;
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import std.traits;
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import tanya.memory;
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import tanya.range.array;
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/**
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* Thrown on encoding errors.
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*/
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class UTFException : Exception
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{
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/**
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* Params:
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* msg = The message for the exception.
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* file = The file where the exception occurred.
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* line = The line number where the exception occurred.
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* next = The previous exception in the chain of exceptions, if any.
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*/
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this(string msg,
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string file = __FILE__,
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size_t line = __LINE__,
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Throwable next = null) @nogc @safe pure nothrow
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{
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super(msg, file, line, next);
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}
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}
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/**
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* Iterates $(D_PSYMBOL String) by UTF-8 code unit.
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*
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* Params:
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* E = Element type ($(D_KEYWORD char) or $(D_INLINECODE const(char))).
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*/
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struct ByCodeUnit(E)
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if (is(Unqual!E == char))
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{
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private E* begin, end;
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private alias ContainerType = CopyConstness!(E, String);
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private ContainerType* container;
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invariant
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{
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assert(this.begin <= this.end);
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assert(this.container !is null);
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assert(this.begin >= this.container.data);
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assert(this.end <= this.container.data + this.container.length);
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}
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private this(ref ContainerType container, E* begin, E* end) @trusted
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in
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{
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assert(begin <= end);
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assert(begin >= container.data);
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assert(end <= container.data + container.length);
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}
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body
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{
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this.container = &container;
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this.begin = begin;
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this.end = end;
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}
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@disable this();
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@property ByCodeUnit save()
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{
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return this;
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}
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@property bool empty() const
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{
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return this.begin == this.end;
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}
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@property size_t length() const
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{
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return this.end - this.begin;
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}
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alias opDollar = length;
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@property ref inout(E) front() inout
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in
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{
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assert(!empty);
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}
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body
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{
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return *this.begin;
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}
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@property ref inout(E) back() inout @trusted
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in
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{
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assert(!empty);
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}
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body
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{
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return *(this.end - 1);
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}
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void popFront() @trusted
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in
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{
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assert(!empty);
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}
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body
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{
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++this.begin;
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}
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void popBack() @trusted
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in
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{
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assert(!empty);
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}
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body
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{
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--this.end;
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}
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ref inout(E) opIndex(const size_t i) inout @trusted
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in
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{
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assert(i < length);
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}
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body
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{
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return *(this.begin + i);
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}
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ByCodeUnit opIndex()
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{
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return typeof(return)(*this.container, this.begin, this.end);
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}
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ByCodeUnit!(const E) opIndex() const
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{
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return typeof(return)(*this.container, this.begin, this.end);
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}
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ByCodeUnit opSlice(const size_t i, const size_t j) @trusted
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in
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{
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assert(i <= j);
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assert(j <= length);
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}
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body
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{
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return typeof(return)(*this.container, this.begin + i, this.begin + j);
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}
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ByCodeUnit!(const E) opSlice(const size_t i, const size_t j) const @trusted
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in
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{
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assert(i <= j);
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assert(j <= length);
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}
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body
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{
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return typeof(return)(*this.container, this.begin + i, this.begin + j);
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}
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inout(E)[] get() inout @trusted
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{
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return this.begin[0 .. length];
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}
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}
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/**
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* Iterates $(D_PSYMBOL String) by UTF-8 code point.
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*
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* Params:
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* E = Element type ($(D_KEYWORD char) or $(D_INLINECODE const(char))).
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*/
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struct ByCodePoint(E)
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if (is(Unqual!E == char))
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{
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private E* begin, end;
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private alias ContainerType = CopyConstness!(E, String);
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private ContainerType* container;
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invariant
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{
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assert(this.begin <= this.end);
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assert(this.container !is null);
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assert(this.begin >= this.container.data);
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assert(this.end <= this.container.data + this.container.length);
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}
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private this(ref ContainerType container, E* begin, E* end) @trusted
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in
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{
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assert(begin <= end);
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assert(begin >= container.data);
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assert(end <= container.data + container.length);
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}
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body
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{
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this.container = &container;
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this.begin = begin;
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this.end = end;
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}
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@disable this();
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@property ByCodePoint save()
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{
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return this;
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}
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@property bool empty() const
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{
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return this.begin == this.end;
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}
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@property dchar front() const @trusted
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in
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{
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assert(!empty);
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}
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out (chr)
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{
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assert(chr < 0xd800 || chr > 0xdfff);
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}
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body
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{
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dchar chr;
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ubyte units, mask;
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const(char)* it = this.begin;
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if (*it & 0x80)
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{
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mask = 0xe0;
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for (units = 2; ((*it << units) & 0x80) != 0; ++units)
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{
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mask = (mask >> 1) | 0x80;
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}
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}
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if (this.begin + units > end || units > 4)
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{
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throw defaultAllocator.make!UTFException("Invalid UTF-8 character");
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}
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chr = *it++ & ~mask;
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for (; units > 1; --units)
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{
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chr = (chr << 6) | (*it++ & 0x3f);
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}
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return chr;
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}
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void popFront() @trusted
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in
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{
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assert(!empty);
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}
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body
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{
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ubyte units;
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if ((*begin & 0x80) == 0)
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{
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units = 1;
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}
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else if ((*begin & 0xc0) == 0xc0)
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{
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units = 2;
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}
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else if ((*begin & 0xe0) == 0xe0)
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{
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units = 3;
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}
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else if ((*begin & 0xf0) == 0xf0)
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{
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units = 4;
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}
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if (units == 0 || this.begin + units > this.end)
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{
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throw defaultAllocator.make!UTFException("Invalid UTF-8 character");
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}
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this.begin += units;
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}
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ByCodePoint opIndex()
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{
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return typeof(return)(*this.container, this.begin, this.end);
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}
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ByCodePoint!(const E) opIndex() const
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{
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return typeof(return)(*this.container, this.begin, this.end);
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}
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}
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/**
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* UTF-8 string.
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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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pure nothrow @safe @nogc invariant
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{
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assert(this.length_ <= this.capacity_);
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}
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/**
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* Constructs the string from a stringish range.
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*
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* Params:
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* S = String type.
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* str = Initial string.
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* allocator = Allocator.
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*
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* Throws: $(D_PSYMBOL UTFException).
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*
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* Precondition: $(D_INLINECODE allocator is null).
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*/
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this(S)(const S str, shared Allocator allocator = defaultAllocator)
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if (!isInfinite!S
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&& isInputRange!S
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&& isSomeChar!(ElementEncodingType!S))
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{
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this(allocator);
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insertBack(str);
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}
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///
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@safe @nogc unittest
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{
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auto s = String("\u10437"w);
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assert(s == "\u10437");
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}
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///
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@safe @nogc 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(s == "Отказаться от вина - в этом страшная вина.");
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}
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/**
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* Initializes this string from another one.
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*
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* If $(D_PARAM init) is passed by value, it won't be copied, but moved.
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* If the allocator of ($D_PARAM init) matches $(D_PARAM allocator),
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* $(D_KEYWORD this) will just take the ownership over $(D_PARAM init)'s
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* storage, otherwise, the storage will be allocated with
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* $(D_PARAM allocator). $(D_PARAM init) will be destroyed at the end.
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*
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* If $(D_PARAM init) is passed by reference, it will be copied.
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*
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* Params:
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* S = Source string type.
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* init = Source string.
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* allocator = Allocator.
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*
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* Precondition: $(D_INLINECODE allocator is null).
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*/
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this(S)(S init, shared Allocator allocator = defaultAllocator)
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nothrow @trusted @nogc
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if (is(S == String))
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{
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this(allocator);
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if (allocator !is init.allocator)
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{
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// Just steal all references and the allocator.
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this.data = init.data;
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this.length_ = init.length_;
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this.capacity_ = init.capacity_;
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// Reset the source string, so it can't destroy the moved storage.
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init.length_ = init.capacity_ = 0;
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init.data = null;
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}
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else
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{
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reserve(init.length);
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init.data[0 .. init.length].copy(this.data[0 .. init.length]);
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this.length_ = init.length;
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}
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}
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/// Ditto.
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this(S)(ref S init, shared Allocator allocator = defaultAllocator)
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nothrow @trusted @nogc
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if (is(Unqual!S == String))
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{
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this(allocator);
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reserve(init.length);
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init.data[0 .. init.length].copy(this.data[0 .. init.length]);
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this.length_ = init.length;
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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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this.allocator_ = allocator;
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}
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/**
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* Fills the string with $(D_PARAM n) consecutive copies of character $(D_PARAM chr).
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*
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* Params:
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* C = Type of the character to fill the string with.
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* n = Number of characters to copy.
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* chr = Character to fill the string with.
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* allocator = Allocator.
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*/
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this(C)(const size_t n,
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const C chr,
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shared Allocator allocator = defaultAllocator) @trusted
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if (isSomeChar!C)
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{
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this(allocator);
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if (n == 0)
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{
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return;
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}
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insertBack(chr);
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// insertBack should validate the character, so we can just copy it
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// n - 1 times.
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auto remaining = length * n;
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reserve(remaining);
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// Use a quick copy.
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for (auto i = this.length_ * 2; i <= remaining; i *= 2)
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{
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this.data[0 .. this.length_].copy(this.data[this.length_ .. i]);
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this.length_ = i;
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}
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remaining -= length;
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copy(this.data[this.length_ - remaining .. this.length_],
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this.data[this.length_ .. this.length_ + remaining]);
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this.length_ += remaining;
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}
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///
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@safe @nogc unittest
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{
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{
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auto s = String(1, 'О');
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assert(s.length == 2);
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}
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{
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auto s = String(3, 'О');
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assert(s.length == 6);
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}
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{
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auto s = String(8, 'О');
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assert(s.length == 16);
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}
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}
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@safe @nogc unittest
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{
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auto s = String(0, 'K');
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assert(s.length == 0);
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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.resize(this.data[0 .. this.capacity_], 0);
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}
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private void write4Bytes(ref const dchar src)
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pure nothrow @trusted @nogc
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in
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{
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assert(capacity - length >= 4);
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assert(src - 0x10000 < 0x100000);
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}
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body
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{
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auto dst = this.data + length;
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*dst++ = 0xf0 | (src >> 18);
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*dst++ = 0x80 | ((src >> 12) & 0x3f);
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*dst++ = 0x80 | ((src >> 6) & 0x3f);
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*dst = 0x80 | (src & 0x3f);
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this.length_ += 4;
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}
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private size_t insertWideChar(C)(auto ref const C chr) @trusted
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if (is(C == wchar) || is(C == dchar))
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in
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||
{
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assert(capacity - length >= 3);
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}
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body
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{
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auto dst = this.data + length;
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if (chr < 0x80)
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{
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*dst = chr & 0x7f;
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this.length_ += 1;
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return 1;
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}
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else if (chr < 0x800)
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{
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*dst++ = 0xc0 | (chr >> 6) & 0xff;
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*dst = 0x80 | (chr & 0x3f);
|
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this.length_ += 2;
|
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return 2;
|
||
}
|
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else if (chr < 0xd800 || (chr >= 0xe000 && chr <= 0xffff))
|
||
{
|
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*dst++ = 0xe0 | (chr >> 12) & 0xff;
|
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*dst++ = 0x80 | ((chr >> 6) & 0x3f);
|
||
*dst = 0x80 | (chr & 0x3f);
|
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this.length_ += 3;
|
||
return 3;
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
/**
|
||
* Inserts a single character at the end of the string.
|
||
*
|
||
* Params:
|
||
* chr = The character should be inserted.
|
||
*
|
||
* Returns: The number of bytes inserted.
|
||
*
|
||
* Throws: $(D_PSYMBOL UTFException).
|
||
*/
|
||
size_t insertBack(const char chr) @trusted @nogc
|
||
{
|
||
if ((chr & 0x80) != 0)
|
||
{
|
||
throw defaultAllocator.make!UTFException("Invalid UTF-8 character");
|
||
}
|
||
reserve(length + 1);
|
||
|
||
*(data + length) = chr;
|
||
++this.length_;
|
||
|
||
return 1;
|
||
}
|
||
|
||
/// Ditto.
|
||
size_t insertBack(const wchar chr) @trusted @nogc
|
||
{
|
||
reserve(length + 3);
|
||
|
||
const ret = insertWideChar(chr);
|
||
if (ret == 0)
|
||
{
|
||
throw defaultAllocator.make!UTFException("Invalid UTF-16 sequeunce");
|
||
}
|
||
return ret;
|
||
}
|
||
|
||
// Allocates enough space for 3-byte character.
|
||
private @safe @nogc unittest
|
||
{
|
||
String s;
|
||
s.insertBack('\u8100');
|
||
}
|
||
|
||
private @safe @nogc unittest
|
||
{
|
||
UTFException exception;
|
||
try
|
||
{
|
||
auto s = String(1, cast(wchar) 0xd900);
|
||
}
|
||
catch (UTFException e)
|
||
{
|
||
exception = e;
|
||
}
|
||
assert(exception !is null);
|
||
defaultAllocator.dispose(exception);
|
||
}
|
||
|
||
/// Ditto.
|
||
size_t insertBack(const dchar chr) @trusted @nogc
|
||
{
|
||
reserve(length + dchar.sizeof);
|
||
|
||
const ret = insertWideChar(chr);
|
||
if (ret > 0)
|
||
{
|
||
return ret;
|
||
}
|
||
else if (chr - 0x10000 < 0x100000)
|
||
{
|
||
write4Bytes(chr);
|
||
return 4;
|
||
}
|
||
else
|
||
{
|
||
throw defaultAllocator.make!UTFException("Invalid UTF-32 sequeunce");
|
||
}
|
||
}
|
||
|
||
private @safe @nogc unittest
|
||
{
|
||
UTFException exception;
|
||
try
|
||
{
|
||
auto s = String(1, cast(dchar) 0xd900);
|
||
}
|
||
catch (UTFException e)
|
||
{
|
||
exception = e;
|
||
}
|
||
assert(exception !is null);
|
||
defaultAllocator.dispose(exception);
|
||
}
|
||
|
||
/**
|
||
* Inserts a stringish range at the end of the string.
|
||
*
|
||
* Params:
|
||
* R = Type of the inserted string.
|
||
* str = String should be inserted.
|
||
*
|
||
* Returns: The number of bytes inserted.
|
||
*
|
||
* Throws: $(D_PSYMBOL UTFException).
|
||
*/
|
||
size_t insertBack(R)(R str) @trusted
|
||
if (!isInfinite!R
|
||
&& isInputRange!R
|
||
&& is(Unqual!(ElementEncodingType!R) == char))
|
||
{
|
||
size_t size;
|
||
static if (hasLength!R || isNarrowString!R)
|
||
{
|
||
size = str.length + length;
|
||
reserve(size);
|
||
}
|
||
|
||
static if (isNarrowString!R)
|
||
{
|
||
str.copy(this.data[length .. size]);
|
||
this.length_ = size;
|
||
return str.length;
|
||
}
|
||
else
|
||
{
|
||
size_t insertedLength;
|
||
while (!str.empty)
|
||
{
|
||
ubyte expectedLength;
|
||
if ((str.front & 0x80) == 0x00)
|
||
{
|
||
expectedLength = 1;
|
||
}
|
||
else if ((str.front & 0xe0) == 0xc0)
|
||
{
|
||
expectedLength = 2;
|
||
}
|
||
else if ((str.front & 0xf0) == 0xe0)
|
||
{
|
||
expectedLength = 3;
|
||
}
|
||
else if ((str.front & 0xf8) == 0xf0)
|
||
{
|
||
expectedLength = 4;
|
||
}
|
||
else
|
||
{
|
||
throw defaultAllocator.make!UTFException("Invalid UTF-8 sequeunce");
|
||
}
|
||
size = length + expectedLength;
|
||
reserve(size);
|
||
|
||
for (; expectedLength > 0; --expectedLength)
|
||
{
|
||
if (str.empty)
|
||
{
|
||
throw defaultAllocator.make!UTFException("Invalid UTF-8 sequeunce");
|
||
}
|
||
*(data + length) = str.front;
|
||
str.popFront();
|
||
}
|
||
insertedLength += expectedLength;
|
||
this.length_ = size;
|
||
}
|
||
return insertedLength;
|
||
}
|
||
}
|
||
|
||
/// Ditto.
|
||
size_t insertBack(R)(R str) @trusted
|
||
if (!isInfinite!R
|
||
&& isInputRange!R
|
||
&& is(Unqual!(ElementEncodingType!R) == wchar))
|
||
{
|
||
static if (hasLength!R || isNarrowString!R)
|
||
{
|
||
reserve(length + str.length * wchar.sizeof);
|
||
}
|
||
|
||
static if (isNarrowString!R)
|
||
{
|
||
const(wchar)[] range = str;
|
||
}
|
||
else
|
||
{
|
||
alias range = str;
|
||
}
|
||
|
||
auto oldLength = length;
|
||
|
||
while (!range.empty)
|
||
{
|
||
reserve(length + wchar.sizeof * 2);
|
||
|
||
auto ret = insertWideChar(range.front);
|
||
if (ret > 0)
|
||
{
|
||
range.popFront();
|
||
}
|
||
else if (range.front - 0xd800 < 2048)
|
||
{ // Surrogate pair.
|
||
static if (isNarrowString!R)
|
||
{
|
||
if (range.length < 2 || range[1] - 0xdc00 >= 0x400)
|
||
{
|
||
throw defaultAllocator.make!UTFException("Invalid UTF-16 sequeunce");
|
||
}
|
||
dchar d = (range[0] - 0xd800) | ((range[1] - 0xdc00) >> 10);
|
||
|
||
range.popFrontN(2);
|
||
}
|
||
else
|
||
{
|
||
dchar d = range.front - 0xd800;
|
||
range.popFront();
|
||
|
||
if (range.empty || range.front - 0xdc00 >= 0x400)
|
||
{
|
||
throw defaultAllocator.make!UTFException("Invalid UTF-16 sequeunce");
|
||
}
|
||
d |= (range.front - 0xdc00) >> 10;
|
||
|
||
range.popFront();
|
||
}
|
||
write4Bytes(d);
|
||
}
|
||
else
|
||
{
|
||
throw defaultAllocator.make!UTFException("Invalid UTF-16 sequeunce");
|
||
}
|
||
}
|
||
return this.length_ - oldLength;
|
||
}
|
||
|
||
/// Ditto.
|
||
size_t insertBack(R)(R str) @trusted
|
||
if (!isInfinite!R
|
||
&& isInputRange!R
|
||
&& is(Unqual!(ElementEncodingType!R) == dchar))
|
||
{
|
||
static if (hasLength!R || isSomeString!R)
|
||
{
|
||
reserve(length + str.length * 4);
|
||
}
|
||
|
||
size_t insertedLength;
|
||
foreach (const dchar c; str)
|
||
{
|
||
insertedLength += insertBack(c);
|
||
}
|
||
return insertedLength;
|
||
}
|
||
|
||
/// Ditto.
|
||
alias insert = insertBack;
|
||
|
||
/**
|
||
* Reserves $(D_PARAM size) bytes for the string.
|
||
*
|
||
* If $(D_PARAM size) is less than or equal to the $(D_PSYMBOL capacity), the
|
||
* function call does not cause a reallocation and the string capacity is not
|
||
* affected.
|
||
*
|
||
* Params:
|
||
* size = Desired size in bytes.
|
||
*/
|
||
void reserve(const size_t size) nothrow @trusted @nogc
|
||
{
|
||
if (this.capacity_ >= size)
|
||
{
|
||
return;
|
||
}
|
||
|
||
this.data = allocator.resize(this.data[0 .. this.capacity_], size).ptr;
|
||
this.capacity_ = size;
|
||
}
|
||
|
||
///
|
||
@nogc @safe unittest
|
||
{
|
||
String s;
|
||
assert(s.capacity == 0);
|
||
|
||
s.reserve(3);
|
||
assert(s.capacity == 3);
|
||
|
||
s.reserve(3);
|
||
assert(s.capacity == 3);
|
||
|
||
s.reserve(1);
|
||
assert(s.capacity == 3);
|
||
}
|
||
|
||
/**
|
||
* Requests the string to reduce its capacity to fit the $(D_PARAM size).
|
||
*
|
||
* The request is non-binding. The string won't become smaller than the
|
||
* string byte length.
|
||
*
|
||
* Params:
|
||
* size = Desired size.
|
||
*/
|
||
void shrink(const size_t size) nothrow @trusted @nogc
|
||
{
|
||
if (this.capacity_ <= size)
|
||
{
|
||
return;
|
||
}
|
||
|
||
const n = max(this.length_, size);
|
||
void[] buf = this.data[0 .. this.capacity_];
|
||
if (allocator.reallocate(buf, n))
|
||
{
|
||
this.capacity_ = n;
|
||
this.data = cast(char*) buf;
|
||
}
|
||
}
|
||
|
||
///
|
||
@nogc @safe unittest
|
||
{
|
||
auto s = String("Die Alten lasen laut.");
|
||
assert(s.capacity == 21);
|
||
|
||
s.reserve(30);
|
||
s.shrink(25);
|
||
assert(s.capacity == 25);
|
||
|
||
s.shrink(18);
|
||
assert(s.capacity == 21);
|
||
|
||
s.shrink(22);
|
||
assert(s.capacity == 21);
|
||
}
|
||
|
||
/**
|
||
* Returns: String capacity in bytes.
|
||
*/
|
||
@property size_t capacity() const pure nothrow @safe @nogc
|
||
{
|
||
return this.capacity_;
|
||
}
|
||
|
||
///
|
||
@safe @nogc unittest
|
||
{
|
||
auto s = String("In allem Schreiben ist Schamlosigkeit.");
|
||
assert(s.capacity == 38);
|
||
}
|
||
|
||
/**
|
||
* Slicing assignment.
|
||
*
|
||
* Params:
|
||
* R = $(D_KEYWORD char).
|
||
* value = Assigned character, range or string.
|
||
* i = Slice start.
|
||
* j = Slice end.
|
||
*
|
||
* Returns: Slice with the assigned part of the string.
|
||
*
|
||
* Precondition: $(D_INLINECODE i <= j && j <= length
|
||
* && value.length == j - i)
|
||
*/
|
||
ByCodeUnit!char opSliceAssign(R)(ByCodeUnit!R value,
|
||
const size_t i,
|
||
const size_t j) @trusted
|
||
if (is(Unqual!R == char))
|
||
in
|
||
{
|
||
assert(i <= j);
|
||
assert(j <= length);
|
||
assert(j - i == value.length);
|
||
}
|
||
body
|
||
{
|
||
auto target = opSlice(i, j);
|
||
copy(value, target);
|
||
return target;
|
||
}
|
||
|
||
/// Ditto.
|
||
ByCodeUnit!char opSliceAssign(const char[] value,
|
||
const size_t i,
|
||
const size_t j)
|
||
pure nothrow @trusted @nogc
|
||
in
|
||
{
|
||
assert(i <= j);
|
||
assert(j <= length);
|
||
}
|
||
body
|
||
{
|
||
copy(value[], this.data[i .. j]);
|
||
return opSlice(i, j);
|
||
}
|
||
|
||
/// Ditto.
|
||
ByCodeUnit!char opSliceAssign(const char value,
|
||
const size_t i,
|
||
const size_t j)
|
||
pure nothrow @trusted @nogc
|
||
in
|
||
{
|
||
assert(i <= j);
|
||
assert(j <= length);
|
||
}
|
||
body
|
||
{
|
||
for (auto p = this.data + i; p < this.data + j; ++p)
|
||
{
|
||
*p = value;
|
||
}
|
||
return opSlice(i, j);
|
||
}
|
||
|
||
/**
|
||
* Returns an array used internally by the string.
|
||
* The length of the returned array may be smaller than the size of the
|
||
* reserved memory for the string.
|
||
*
|
||
* Returns: The array representing the string.
|
||
*/
|
||
inout(char)[] get() inout pure nothrow @trusted @nogc
|
||
{
|
||
return this.data[0 .. this.length_];
|
||
}
|
||
|
||
///
|
||
nothrow @safe @nogc unittest
|
||
{
|
||
auto s = String("Char array.");
|
||
assert(s.get().length == 11);
|
||
}
|
||
|
||
/**
|
||
* Returns null-terminated string. The returned string is managed by this
|
||
* object and shouldn't be freed.
|
||
*
|
||
* Returns: Null-terminated string.
|
||
*/
|
||
const(char)* toStringz() nothrow @nogc
|
||
{
|
||
reserve(length + 1);
|
||
this.data[length] = '\0';
|
||
return this.data;
|
||
}
|
||
|
||
///
|
||
@nogc unittest
|
||
{
|
||
auto s = String("C string.");
|
||
assert(s.toStringz()[0] == 'C');
|
||
assert(s.toStringz()[9] == '\0');
|
||
}
|
||
|
||
/**
|
||
* Returns: The number of code units that are required to encode the string.
|
||
*/
|
||
@property size_t length() const pure nothrow @safe @nogc
|
||
{
|
||
return this.length_;
|
||
}
|
||
|
||
///
|
||
alias opDollar = length;
|
||
|
||
///
|
||
@safe @nogc unittest
|
||
{
|
||
auto s = String("Piscis primuin a capite foetat.");
|
||
assert(s.length == 31);
|
||
assert(s[$ - 1] == '.');
|
||
}
|
||
|
||
/**
|
||
* Params:
|
||
* pos = Position.
|
||
*
|
||
* Returns: Byte at $(D_PARAM pos).
|
||
*
|
||
* Precondition: $(D_INLINECODE length > pos).
|
||
*/
|
||
ref inout(char) opIndex(const size_t pos) inout pure nothrow @trusted @nogc
|
||
in
|
||
{
|
||
assert(length > pos);
|
||
}
|
||
body
|
||
{
|
||
return *(this.data + pos);
|
||
}
|
||
|
||
///
|
||
@safe @nogc unittest
|
||
{
|
||
auto s = String("Alea iacta est.");
|
||
assert(s[0] == 'A');
|
||
assert(s[4] == ' ');
|
||
}
|
||
|
||
/**
|
||
* Returns: Random access range that iterates over the string by bytes, in
|
||
* forward order.
|
||
*/
|
||
ByCodeUnit!char opIndex() pure nothrow @trusted @nogc
|
||
{
|
||
return typeof(return)(this, this.data, this.data + length);
|
||
}
|
||
|
||
/// Ditto.
|
||
ByCodeUnit!(const char) opIndex() const pure nothrow @trusted @nogc
|
||
{
|
||
return typeof(return)(this, this.data, this.data + length);
|
||
}
|
||
|
||
///
|
||
@safe @nogc unittest
|
||
{
|
||
auto s = String("Plutarchus");
|
||
auto r = s[];
|
||
assert(r.front == 'P');
|
||
assert(r.back == 's');
|
||
|
||
r.popFront();
|
||
assert(r.front == 'l');
|
||
assert(r.back == 's');
|
||
|
||
r.popBack();
|
||
assert(r.front == 'l');
|
||
assert(r.back == 'u');
|
||
|
||
assert(r.length == 8);
|
||
}
|
||
|
||
/**
|
||
* Returns: Forward range that iterates over the string by code points.
|
||
*/
|
||
ByCodePoint!char byCodePoint() pure nothrow @trusted @nogc
|
||
{
|
||
return typeof(return)(this, this.data, this.data + length);
|
||
}
|
||
|
||
/// Ditto.
|
||
ByCodePoint!(const char) byCodePoint() const pure nothrow @trusted @nogc
|
||
{
|
||
return typeof(return)(this, this.data, this.data + length);
|
||
}
|
||
|
||
///
|
||
@safe @nogc unittest
|
||
{
|
||
auto s = String("Высоцкий");
|
||
auto cp = s.byCodePoint();
|
||
assert(cp.front == 'В');
|
||
cp.popFront();
|
||
assert(cp.front == 'ы');
|
||
cp.popFront();
|
||
assert(cp.front == 'с');
|
||
|
||
s = String("€");
|
||
cp = s.byCodePoint();
|
||
assert(cp.front == '€');
|
||
assert(s.length == 3);
|
||
|
||
s = String("\U00024B62");
|
||
cp = s.byCodePoint();
|
||
assert(cp.front == '\U00024B62');
|
||
assert(s.length == 4);
|
||
}
|
||
|
||
/**
|
||
* Returns: $(D_KEYWORD true) if the string is empty.
|
||
*/
|
||
@property bool empty() const pure nothrow @safe @nogc
|
||
{
|
||
return length == 0;
|
||
}
|
||
|
||
///
|
||
@safe @nogc unittest
|
||
{
|
||
String s;
|
||
assert(s.empty);
|
||
|
||
s.insertBack('K');
|
||
assert(!s.empty);
|
||
}
|
||
|
||
/**
|
||
* Params:
|
||
* i = Slice start.
|
||
* j = Slice end.
|
||
*
|
||
* Returns: A range that iterates over the string by bytes from
|
||
* index $(D_PARAM i) up to (excluding) index $(D_PARAM j).
|
||
*
|
||
* Precondition: $(D_INLINECODE i <= j && j <= length).
|
||
*/
|
||
ByCodeUnit!char opSlice(const size_t i, const size_t j)
|
||
pure nothrow @trusted @nogc
|
||
in
|
||
{
|
||
assert(i <= j);
|
||
assert(j <= length);
|
||
}
|
||
body
|
||
{
|
||
return typeof(return)(this, this.data + i, this.data + j);
|
||
}
|
||
|
||
/// Ditto.
|
||
ByCodeUnit!(const char) opSlice(const size_t i, const size_t j)
|
||
const pure nothrow @trusted @nogc
|
||
in
|
||
{
|
||
assert(i <= j);
|
||
assert(j <= length);
|
||
}
|
||
body
|
||
{
|
||
return typeof(return)(this, this.data + i, this.data + j);
|
||
}
|
||
|
||
///
|
||
@safe @nogc unittest
|
||
{
|
||
auto s = String("Vladimir Soloviev");
|
||
auto r = s[9 .. $];
|
||
|
||
assert(r.front == 'S');
|
||
assert(r.back == 'v');
|
||
|
||
r.popFront();
|
||
r.popBack();
|
||
assert(r.front == 'o');
|
||
assert(r.back == 'e');
|
||
|
||
r.popFront();
|
||
r.popBack();
|
||
assert(r.front == 'l');
|
||
assert(r.back == 'i');
|
||
|
||
r.popFront();
|
||
r.popBack();
|
||
assert(r.front == 'o');
|
||
assert(r.back == 'v');
|
||
|
||
r.popFront();
|
||
r.popBack();
|
||
assert(r.empty);
|
||
}
|
||
|
||
/**
|
||
* Assigns another string.
|
||
*
|
||
* If $(D_PARAM that) is passed by value, it won't be copied, but moved.
|
||
* This string will take the ownership over $(D_PARAM that)'s storage and
|
||
* the allocator.
|
||
*
|
||
* If $(D_PARAM that) is passed by reference, it will be copied.
|
||
*
|
||
* Params:
|
||
* S = Content type.
|
||
* that = The value should be assigned.
|
||
*
|
||
* Returns: $(D_KEYWORD this).
|
||
*/
|
||
ref String opAssign(S)(S that)
|
||
if (is(S == String))
|
||
{
|
||
swap(this.data, that.data);
|
||
swap(this.length_, that.length_);
|
||
swap(this.capacity_, that.capacity_);
|
||
swap(this.allocator_, that.allocator_);
|
||
return this;
|
||
}
|
||
|
||
/// Ditto.
|
||
ref String opAssign(S)(ref S that) @trusted
|
||
if (is(Unqual!S == String))
|
||
{
|
||
reserve(that.length);
|
||
that.data[0 .. that.length].copy(this.data[0 .. that.length]);
|
||
this.length_ = that.length;
|
||
return this;
|
||
}
|
||
|
||
///
|
||
@safe @nogc unittest
|
||
{
|
||
auto s = String("Черная, потом пропахшая выть!");
|
||
s = String("Как мне тебя не ласкать, не любить?");
|
||
}
|
||
|
||
/**
|
||
* Assigns a stringish range.
|
||
*
|
||
* Params:
|
||
* S = String type.
|
||
* that = Initial string.
|
||
*
|
||
* Returns: $(D_KEYWORD this).
|
||
*
|
||
* Throws: $(D_PSYMBOL UTFException).
|
||
*/
|
||
ref String opAssign(S)(S that) nothrow
|
||
if (!isInfinite!S
|
||
&& isInputRange!S
|
||
&& isSomeChar!(ElementEncodingType!S))
|
||
{
|
||
this.length_ = 0;
|
||
insertBack(that);
|
||
return this;
|
||
}
|
||
|
||
///
|
||
@safe @nogc unittest
|
||
{
|
||
auto s = String("Оловом светится лужная голь...");
|
||
s = "Грустная песня, ты - русская боль.";
|
||
}
|
||
|
||
/**
|
||
* Comparison for equality.
|
||
*
|
||
* Params:
|
||
* S = Right hand side type.
|
||
* that = The string to compare with.
|
||
*
|
||
* Returns: A positive number if $(D_KEYWORD this) is lexicographically
|
||
* greater than $(D_PARAM that), if equal `0`, else `-1`.
|
||
*/
|
||
int opCmp(S)(auto ref S that) const @trusted
|
||
if (is(Unqual!S == String))
|
||
{
|
||
return cmp(this.data[0 .. length], that.data[0 .. that.length]);
|
||
}
|
||
|
||
/// Ditto.
|
||
int opCmp(S)(ByCodeUnit!S that) const @trusted
|
||
if (is(Unqual!S == char))
|
||
{
|
||
return cmp(this.data[0 .. length],
|
||
that.begin[0 .. that.end - that.begin]);
|
||
}
|
||
|
||
/// Ditto.
|
||
int opCmp(S)(ByCodePoint!S that) const @trusted
|
||
if (is(Unqual!S == char))
|
||
{
|
||
return cmp(this.data[0 .. length],
|
||
that.begin[0 .. that.end - that.begin]);
|
||
}
|
||
|
||
/// Ditto.
|
||
int opCmp()(const char[] that) const @trusted
|
||
{
|
||
return cmp(this.data[0 .. length], that);
|
||
}
|
||
|
||
///
|
||
@safe @nogc unittest
|
||
{
|
||
assert(String("Голубая кофта.") < String("Синие глаза."));
|
||
assert(String("Никакой я правды") < String("милой не сказал")[]);
|
||
}
|
||
|
||
/**
|
||
* Comparison for equality.
|
||
*
|
||
* Params:
|
||
* S = Right hand side type.
|
||
* that = The string to compare with.
|
||
*
|
||
* Returns: $(D_KEYWORD true) if the strings are equal, $(D_KEYWORD false)
|
||
* otherwise.
|
||
*/
|
||
bool opEquals(S)(auto ref S that) const @trusted
|
||
if (is(Unqual!S == String))
|
||
{
|
||
return equal(this.data[0 .. length], that.data[0 .. that.length]);
|
||
}
|
||
|
||
/**
|
||
* Comparison for equality.
|
||
*
|
||
* Params:
|
||
* that = Right hand side string range.
|
||
*
|
||
* Returns: $(D_KEYWORD true) if the string and the range are equal,
|
||
* $(D_KEYWORD false) otherwise.
|
||
*/
|
||
bool opEquals(S)(ByCodeUnit!S that) const @trusted
|
||
if (is(Unqual!S == char))
|
||
{
|
||
return equal(this.data[0 .. length],
|
||
that.begin[0 .. that.end - that.begin]);
|
||
}
|
||
|
||
/// Ditto.
|
||
bool opEquals(S)(ByCodePoint!S that) const @trusted
|
||
if (is(Unqual!S == char))
|
||
{
|
||
return equal(this.data[0 .. length],
|
||
that.begin[0 .. that.end - that.begin]);
|
||
}
|
||
|
||
/// Ditto.
|
||
bool opEquals()(const char[] that) const @trusted
|
||
{
|
||
return equal(this.data[0 .. length], that);
|
||
}
|
||
|
||
///
|
||
@safe @nogc unittest
|
||
{
|
||
assert(String("Милая спросила:") != String("Крутит ли метель?"));
|
||
assert(String("Затопить бы печку,") != String("постелить постель.")[]);
|
||
assert(const String("Я ответил милой:") != String("Нынче с высоты"));
|
||
assert(String("Кто-то осыпает") != "белые цветы");
|
||
assert(const String("Затопи ты печку,") != String("постели постель,")[]);
|
||
|
||
auto s = const String("У меня на сердце");
|
||
assert(s[] != String("без тебя метель."));
|
||
assert(s == s);
|
||
assert(s == s[]);
|
||
assert(s == "У меня на сердце");
|
||
}
|
||
|
||
/**
|
||
* Assigns a value to the character with the index $(D_PARAM pos).
|
||
*
|
||
* Params:
|
||
* value = Value.
|
||
* pos = Position.
|
||
*
|
||
* Returns: Assigned value.
|
||
*
|
||
* Precondition: $(D_INLINECODE length > pos).
|
||
*/
|
||
ref char opIndexAssign(const char value, const size_t pos)
|
||
pure nothrow @safe @nogc
|
||
{
|
||
return opIndex(pos) = value;
|
||
}
|
||
|
||
///
|
||
@safe @nogc unittest
|
||
{
|
||
auto s = String("alea iacta est.");
|
||
|
||
s[0] = 'A';
|
||
assert(s[0] == 'A');
|
||
}
|
||
|
||
/**
|
||
* Slicing assignment.
|
||
*
|
||
* Params:
|
||
* R = $(D_KEYWORD char).
|
||
* value = Assigned character, range or string.
|
||
*
|
||
* Returns: Range over the string.
|
||
*
|
||
* Precondition: $(D_INLINECODE length == value.length).
|
||
*/
|
||
ByCodeUnit!char opIndexAssign(R)(ByCodeUnit!R value)
|
||
if (is(Unqual!R == char))
|
||
{
|
||
return opSliceAssign(value, 0, length);
|
||
}
|
||
|
||
private unittest
|
||
{
|
||
auto s1 = String("Buttercup");
|
||
auto s2 = String("Cap");
|
||
s2[] = s1[6 .. $];
|
||
assert(s2 == "cup");
|
||
}
|
||
|
||
/// Ditto.
|
||
ByCodeUnit!char opIndexAssign(const char value) pure nothrow @safe @nogc
|
||
{
|
||
return opSliceAssign(value, 0, length);
|
||
}
|
||
|
||
private unittest
|
||
{
|
||
auto s1 = String("Wow");
|
||
s1[] = 'a';
|
||
assert(s1 == "aaa");
|
||
}
|
||
|
||
/// Ditto.
|
||
ByCodeUnit!char opIndexAssign(const char[] value) pure nothrow @safe @nogc
|
||
{
|
||
return opSliceAssign(value, 0, length);
|
||
}
|
||
|
||
private unittest
|
||
{
|
||
auto s1 = String("ö");
|
||
s1[] = "oe";
|
||
assert(s1 == "oe");
|
||
}
|
||
|
||
/**
|
||
* Remove all characters beloning to $(D_PARAM r).
|
||
*
|
||
* Params:
|
||
* R = $(D_PSYMBOL ByCodeUnit) or $(D_PSYMBOL ByCodePoint).
|
||
* r = Range originally obtained from this string.
|
||
*
|
||
* Returns: A range spanning the remaining characters in the string that
|
||
* initially were right after $(D_PARAM r).
|
||
*
|
||
* Precondition: $(D_PARAM r) refers to a region of $(D_KEYWORD this).
|
||
*/
|
||
R remove(R)(R r) @trusted
|
||
if (is(R == ByCodeUnit!char) || is(R == ByCodePoint!char))
|
||
in
|
||
{
|
||
assert(r.container is &this);
|
||
assert(r.begin >= this.data);
|
||
assert(r.end <= this.data + length);
|
||
}
|
||
body
|
||
{
|
||
auto end = this.data + this.length;
|
||
copy(ByCodeUnit!char(this, r.end, end), ByCodeUnit!char(this, r.begin, end));
|
||
this.length_ = length - (r.end - r.begin);
|
||
return R(this, r.begin, this.data + length);
|
||
}
|
||
|
||
///
|
||
@nogc @safe unittest
|
||
{
|
||
auto s = String("Из пословицы слова не выкинешь.");
|
||
|
||
assert(s.remove(s[5 .. 24]).length == 33);
|
||
assert(s == "Из слова не выкинешь.");
|
||
assert(s.length == 38);
|
||
|
||
auto byCodePoint = s.byCodePoint();
|
||
byCodePoint.popFrontN(8);
|
||
|
||
assert(s.remove(byCodePoint).count == 0);
|
||
assert(s == "Из слова");
|
||
|
||
assert(s.remove(s[]).length == 0);
|
||
assert(s.length == 0);
|
||
|
||
assert(s.remove(s[]).length == 0);
|
||
}
|
||
|
||
/**
|
||
* Inserts $(D_PARAM el) before or after $(D_PARAM r).
|
||
*
|
||
* Params:
|
||
* R = $(D_PSYMBOL ByCodeUnit) or $(D_PSYMBOL ByCodePoint).
|
||
* T = Stringish type.
|
||
* r = Range originally obtained from this string.
|
||
* el = Value(s) should be inserted.
|
||
*
|
||
* Returns: The number of elements inserted.
|
||
*
|
||
* Precondition: $(D_PARAM r) refers to a region of $(D_KEYWORD this).
|
||
*/
|
||
size_t insertAfter(T, R)(R r, T el) @trusted
|
||
if ((isSomeChar!T || (!isInfinite!T
|
||
&& isInputRange!T
|
||
&& isSomeChar!(ElementEncodingType!T)))
|
||
&& (is(R == ByCodeUnit!char) || is(R == ByCodePoint!char)))
|
||
in
|
||
{
|
||
assert(r.container is &this);
|
||
assert(r.begin >= this.data);
|
||
assert(r.end <= this.data + length);
|
||
}
|
||
body
|
||
{
|
||
auto oldLen = this.data + length;
|
||
const inserted = insertBack(el);
|
||
bringToFront(ByCodeUnit!char(this, r.end, oldLen),
|
||
ByCodeUnit!char(this, oldLen, this.data + length));
|
||
return inserted;
|
||
}
|
||
|
||
///
|
||
@safe @nogc unittest
|
||
{
|
||
auto s = String("Казнить нельзя помиловать.");
|
||
s.insertAfter(s[0 .. 27], ",");
|
||
assert(s == "Казнить нельзя, помиловать.");
|
||
|
||
s = String("Казнить нельзя помиловать.");
|
||
s.insertAfter(s[0 .. 14], ',');
|
||
assert(s == "Казнить, нельзя помиловать.");
|
||
}
|
||
|
||
///
|
||
size_t insertBefore(T, R)(R r, T el) @trusted
|
||
if ((isSomeChar!T || (!isInfinite!T
|
||
&& isInputRange!T
|
||
&& isSomeChar!(ElementEncodingType!T)))
|
||
&& (is(R == ByCodeUnit!char) || is(R == ByCodePoint!char)))
|
||
in
|
||
{
|
||
assert(r.container is &this);
|
||
assert(r.begin >= this.data);
|
||
assert(r.end <= this.data + length);
|
||
}
|
||
body
|
||
{
|
||
return insertAfter(R(this, this.data, r.begin), el);
|
||
}
|
||
|
||
///
|
||
@safe @nogc unittest
|
||
{
|
||
auto s = String("Казнить нельзя помиловать.");
|
||
s.insertBefore(s[27 .. $], ",");
|
||
assert(s == "Казнить нельзя, помиловать.");
|
||
|
||
s = String("Казнить нельзя помиловать.");
|
||
s.insertBefore(s[14 .. $], ',');
|
||
assert(s == "Казнить, нельзя помиловать.");
|
||
}
|
||
|
||
mixin DefaultAllocator;
|
||
}
|