Initial release
This commit is contained in:
civ
+621
@@ -0,0 +1,621 @@
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// This file is part of VSTGUI. It is subject to the license terms
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// in the LICENSE file found in the top-level directory of this
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// distribution and at http://github.com/steinbergmedia/vstgui/LICENSE
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#pragma once
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#include "vstguifwd.h"
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#include "optional.h"
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#include "platform/iplatformstring.h"
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#include <string>
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#include <functional>
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#include <algorithm>
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#include <cctype>
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#include <cstddef>
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namespace VSTGUI {
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//-----------------------------------------------------------------------------
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template<typename BaseIterator>
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class UTF8CodePointIterator
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{
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public:
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using iterator_category = std::bidirectional_iterator_tag;
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using value_type = char32_t;
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using difference_type = ptrdiff_t;
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using pointer = char32_t*;
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using reference = char32_t&;
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using CodePoint = value_type;
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UTF8CodePointIterator () = default;
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UTF8CodePointIterator (const UTF8CodePointIterator& o) noexcept : it (o.it) {}
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explicit UTF8CodePointIterator (const BaseIterator& iterator) noexcept : it (iterator) {}
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UTF8CodePointIterator& operator++ () noexcept;
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UTF8CodePointIterator& operator-- () noexcept;
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UTF8CodePointIterator operator++ (int) noexcept;
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UTF8CodePointIterator operator-- (int) noexcept;
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bool operator== (const UTF8CodePointIterator& other) const noexcept;
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bool operator!= (const UTF8CodePointIterator& other) const noexcept;
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CodePoint operator* () const noexcept;
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BaseIterator base () const noexcept { return it; }
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private:
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BaseIterator it;
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static constexpr uint8_t kFirstBitMask = 128u; // 1000000
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static constexpr uint8_t kSecondBitMask = 64u; // 0100000
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static constexpr uint8_t kThirdBitMask = 32u; // 0010000
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static constexpr uint8_t kFourthBitMask = 16u; // 0001000
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static constexpr uint8_t kFifthBitMask = 8u; // 0000100
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};
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/**
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* @brief holds an UTF8 encoded string and a platform representation of it
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*
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*/
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//-----------------------------------------------------------------------------
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class UTF8String
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{
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public:
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using StringType = std::string;
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using SizeType = StringType::size_type;
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using CodePointIterator = UTF8CodePointIterator<StringType::const_iterator>;
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UTF8String (UTF8StringPtr str = nullptr);
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UTF8String (const UTF8String& other);
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explicit UTF8String (const StringType& str);
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UTF8String (UTF8String&& other) noexcept;
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UTF8String (StringType&& str) noexcept;
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UTF8String& operator= (const UTF8String& other);
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UTF8String& operator= (const StringType& other);
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UTF8String& operator= (UTF8String&& other) noexcept;
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UTF8String& operator= (StringType&& str) noexcept;
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UTF8String& operator= (UTF8StringPtr str) { assign (str); return *this; }
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SizeType length () const noexcept { return string.length (); }
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bool empty () const noexcept { return string.empty (); }
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void copy (UTF8StringBuffer dst, SizeType dstSize) const noexcept;
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CodePointIterator begin () const noexcept;
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CodePointIterator end () const noexcept;
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bool operator== (UTF8StringPtr str) const noexcept;
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bool operator!= (UTF8StringPtr str) const noexcept;
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bool operator== (const UTF8String& str) const noexcept;
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bool operator!= (const UTF8String& str) const noexcept;
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bool operator== (const StringType& str) const noexcept;
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bool operator!= (const StringType& str) const noexcept;
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UTF8String& operator+= (const UTF8String& other);
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UTF8String& operator+= (StringType::value_type ch);
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UTF8String& operator+= (const StringType::value_type* other);
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UTF8String operator+ (const UTF8String& other);
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UTF8String operator+ (StringType::value_type ch);
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UTF8String operator+ (const StringType::value_type* other);
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void assign (UTF8StringPtr str);
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void clear () noexcept;
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UTF8StringPtr data () const noexcept { return string.data (); }
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operator const UTF8StringPtr () const noexcept { return data (); }
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const StringType& getString () const noexcept { return string; }
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IPlatformString* getPlatformString () const noexcept;
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explicit operator bool () const = delete;
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//-----------------------------------------------------------------------------
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private:
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StringType string;
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mutable PlatformStringPtr platformString;
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};
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inline bool operator== (const UTF8String::StringType& lhs, const UTF8String& rhs) noexcept { return lhs == rhs.getString (); }
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inline bool operator!= (const UTF8String::StringType& lhs, const UTF8String& rhs) noexcept { return lhs != rhs.getString (); }
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inline UTF8String operator+ (UTF8StringPtr lhs, const UTF8String& rhs) { return UTF8String (lhs) += rhs; }
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//-----------------------------------------------------------------------------
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template<typename T>
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inline UTF8String toString (const T& value)
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{
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return UTF8String (std::to_string (value));
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}
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//-----------------------------------------------------------------------------
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/** white-character test
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* @param character UTF-32 character
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* @return true if character is a white-character
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*/
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bool isSpace (char32_t character) noexcept;
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//-----------------------------------------------------------------------------
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struct TrimOptions
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{
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using CharTestFunc = std::function<bool (char32_t)>;
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TrimOptions (CharTestFunc&& func = [] (char32_t c) { return isSpace (c); }) : test (std::move (func)) {}
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TrimOptions& left () { setBit (flags, Flags::kLeft, true); return *this; }
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TrimOptions& right () { setBit (flags, Flags::kRight, true); return *this; }
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bool trimLeft () const { return hasBit (flags, Flags::kLeft); }
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bool trimRight () const { return hasBit (flags, Flags::kRight); }
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bool operator() (char32_t c) const { return !test (c); }
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private:
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enum Flags : uint8_t {
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kLeft = 1 << 0,
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kRight = 1 << 1
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};
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uint8_t flags {0};
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CharTestFunc test;
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};
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//-----------------------------------------------------------------------------
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UTF8String trim (const UTF8String& str, TrimOptions options = TrimOptions ().left ().right ());
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#if VSTGUI_ENABLE_DEPRECATED_METHODS
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//-----------------------------------------------------------------------------
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namespace String {
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VSTGUI_DEPRECATED(/** @deprecated Allocates a new UTF8StringBuffer with enough size for string and copy the string into it. Returns nullptr if string is a nullptr. */
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UTF8StringBuffer newWithString (UTF8StringPtr string);)
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VSTGUI_DEPRECATED(/** @deprecated Frees an UTF8StringBuffer. If buffer is a nullptr it does nothing. */
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void free (UTF8StringBuffer buffer);)
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}
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#endif
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//-----------------------------------------------------------------------------
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/** @brief a view on a null terminated UTF-8 String
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It does not copy the string.
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It's allowed to put null pointers into it.
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A null pointer is treaded different than an empty string as they are not equal and the byte
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count of a null pointer is zero while the empty string has a byte count of one.
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*/
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//-----------------------------------------------------------------------------
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class UTF8StringView
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{
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public:
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UTF8StringView () : str (nullptr), byteCount (0) {}
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UTF8StringView (const UTF8StringPtr string) : str (string) {}
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UTF8StringView (const UTF8String& string) : str (string.data ()), byteCount (string.length () + 1) {}
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UTF8StringView (const std::string& string) : str (string.data ()), byteCount (string.size () + 1) {}
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UTF8StringView (const UTF8StringView& other) noexcept;
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UTF8StringView& operator= (const UTF8StringView& other) noexcept;
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UTF8StringView (UTF8StringView&& other) noexcept = default;
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UTF8StringView& operator= (UTF8StringView&& other) = default;
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/** calculates the bytes used by this string, including null-character */
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size_t calculateByteCount () const;
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/** calculates the number of UTF-8 characters in the string */
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size_t calculateCharacterCount () const;
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/** checks this string if it contains a subString */
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bool contains (const UTF8StringPtr subString, bool ignoreCase = false) const;
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/** checks this string if it starts with startString */
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bool startsWith (const UTF8StringView& startString) const;
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/** checks this string if it ends with endString */
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bool endsWith (const UTF8StringView& endString) const;
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/** converts the string to a double */
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double toDouble (uint32_t precision = 8) const;
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/** converts the string to a float */
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float toFloat (uint32_t precision = 8) const;
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/** converts the string to an integer */
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int64_t toInteger () const;
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template<typename T>
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Optional<T> toNumber () const;
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bool operator== (const UTF8StringPtr otherString) const;
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bool operator!= (const UTF8StringPtr otherString) const;
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bool operator== (UTF8StringView otherString) const;
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bool operator!= (UTF8StringView otherString) const;
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bool operator== (const UTF8String& otherString) const;
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bool operator!= (const UTF8String& otherString) const;
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operator const UTF8StringPtr () const;
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//-----------------------------------------------------------------------------
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private:
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UTF8StringPtr str;
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mutable Optional<size_t> byteCount;
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};
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//-----------------------------------------------------------------------------
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class UTF8CharacterIterator
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{
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public:
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UTF8CharacterIterator (const UTF8StringPtr utf8Str)
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: startPos ((const uint8_t*)utf8Str)
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, currentPos (nullptr)
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, strLen (std::strlen (utf8Str))
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{
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begin ();
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}
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UTF8CharacterIterator (const UTF8StringPtr utf8Str, size_t strLen)
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: startPos ((const uint8_t*)utf8Str)
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, currentPos (nullptr)
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, strLen (strLen)
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{
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begin ();
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}
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UTF8CharacterIterator (const std::string& stdStr)
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: startPos ((const uint8_t*)stdStr.data ())
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, currentPos (nullptr)
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, strLen (stdStr.size ())
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{
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begin ();
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}
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const uint8_t* next ()
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{
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if (currentPos)
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{
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if (currentPos == back ())
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{}
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else if (*currentPos <= 0x7F) // simple ASCII character
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currentPos++;
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else
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{
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uint8_t characterLength = getByteLength ();
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if (characterLength)
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currentPos += characterLength;
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else
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currentPos = end (); // error, not an allowed UTF-8 character at this position
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}
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}
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return currentPos;
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}
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const uint8_t* previous ()
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{
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while (currentPos)
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{
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--currentPos;
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if (currentPos < front ())
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{
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currentPos = begin ();
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break;
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}
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else
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{
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if (*currentPos <= 0x7f || (*currentPos >= 0xC0 && *currentPos <= 0xFD))
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break;
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}
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}
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return currentPos;
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}
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uint8_t getByteLength () const
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{
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if (currentPos && currentPos != back ())
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{
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if (*currentPos <= 0x7F)
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return 1;
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else
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{
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if (*currentPos >= 0xC0 && *currentPos <= 0xFD)
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{
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if ((*currentPos & 0xF8) == 0xF8)
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return 5;
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else if ((*currentPos & 0xF0) == 0xF0)
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return 4;
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else if ((*currentPos & 0xE0) == 0xE0)
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return 3;
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else if ((*currentPos & 0xC0) == 0xC0)
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return 2;
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}
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}
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}
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return 0;
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}
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const uint8_t* begin () { currentPos = startPos; return currentPos;}
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const uint8_t* end () { currentPos = startPos + strLen; return currentPos; }
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const uint8_t* front () const { return startPos; }
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const uint8_t* back () const { return startPos + strLen; }
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const uint8_t* operator++() { return next (); }
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const uint8_t* operator--() { return previous (); }
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bool operator==(uint8_t i) { if (currentPos) return *currentPos == i; return false; }
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operator const uint8_t* () const { return currentPos; }
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protected:
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const uint8_t* startPos;
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const uint8_t* currentPos;
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size_t strLen;
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};
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//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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inline UTF8StringView::UTF8StringView (const UTF8StringView& other) noexcept
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{
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*this = other;
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}
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//------------------------------------------------------------------------
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inline UTF8StringView& UTF8StringView::operator= (const UTF8StringView& other) noexcept
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{
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str = other.str;
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if (other.byteCount)
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byteCount = makeOptional (*other.byteCount);
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return *this;
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}
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//------------------------------------------------------------------------
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inline size_t UTF8StringView::calculateCharacterCount () const
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{
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size_t count = 0;
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if (str == nullptr)
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return count;
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UTF8CharacterIterator it (str);
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while (it != it.back ())
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{
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count++;
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++it;
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}
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return count;
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||||
}
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|
||||
//-----------------------------------------------------------------------------
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inline size_t UTF8StringView::calculateByteCount () const
|
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{
|
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if (!byteCount)
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||||
byteCount = makeOptional<size_t> (str ? std::strlen (str) + 1 : 0);
|
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return *byteCount;
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}
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||||
|
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//-----------------------------------------------------------------------------
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inline bool UTF8StringView::contains (const UTF8StringPtr subString, bool ignoreCase) const
|
||||
{
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||||
if (ignoreCase)
|
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{
|
||||
if (!str || !subString)
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||||
return false;
|
||||
UTF8CharacterIterator subIt (subString);
|
||||
UTF8CharacterIterator it (str, calculateByteCount ());
|
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auto foundIt = std::search (
|
||||
it.begin (), it.end (), subIt.begin (), subIt.end (),
|
||||
[] (uint8_t c1, uint8_t c2) { return std::toupper (c1) == std::toupper (c2); });
|
||||
return foundIt != it.end ();
|
||||
}
|
||||
return (!str || !subString || std::strstr (str, subString) == nullptr) ? false : true;
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||||
}
|
||||
|
||||
//-----------------------------------------------------------------------------
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||||
inline bool UTF8StringView::startsWith (const UTF8StringView& startString) const
|
||||
{
|
||||
if (!str || !startString.str)
|
||||
return false;
|
||||
size_t startStringLen = startString.calculateByteCount ();
|
||||
size_t thisLen = calculateByteCount ();
|
||||
if (startStringLen > thisLen)
|
||||
return false;
|
||||
return std::strncmp (str, startString.str, startStringLen - 1) == 0;
|
||||
}
|
||||
|
||||
//-----------------------------------------------------------------------------
|
||||
inline bool UTF8StringView::endsWith (const UTF8StringView& endString) const
|
||||
{
|
||||
size_t endStringLen = endString.calculateByteCount ();
|
||||
size_t thisLen = calculateByteCount ();
|
||||
if (endStringLen > thisLen)
|
||||
return false;
|
||||
return endString == UTF8StringView (str + (thisLen - endStringLen));
|
||||
}
|
||||
|
||||
//-----------------------------------------------------------------------------
|
||||
inline float UTF8StringView::toFloat (uint32_t precision) const
|
||||
{
|
||||
return static_cast<float>(toDouble (precision));
|
||||
}
|
||||
|
||||
//------------------------------------------------------------------------
|
||||
template<typename T>
|
||||
inline Optional<T> UTF8StringView::toNumber () const
|
||||
{
|
||||
auto number = toInteger ();
|
||||
if constexpr (sizeof (number) > sizeof (T))
|
||||
{
|
||||
if (number > std::numeric_limits<T>::max () || number < std::numeric_limits<T>::min ())
|
||||
return {};
|
||||
}
|
||||
return makeOptional (static_cast<T> (number));
|
||||
}
|
||||
|
||||
//------------------------------------------------------------------------
|
||||
template<>
|
||||
inline Optional<bool> UTF8StringView::toNumber () const
|
||||
{
|
||||
auto number = toInteger ();
|
||||
if (number > 1 || number < 0)
|
||||
return {};
|
||||
return makeOptional (static_cast<bool> (number));
|
||||
}
|
||||
|
||||
//-----------------------------------------------------------------------------
|
||||
inline bool UTF8StringView::operator== (const UTF8StringPtr otherString) const
|
||||
{
|
||||
if (str == otherString) return true;
|
||||
return (str && otherString) ? (std::strcmp (str, otherString) == 0) : false;
|
||||
}
|
||||
|
||||
//-----------------------------------------------------------------------------
|
||||
inline bool UTF8StringView::operator!= (const UTF8StringPtr otherString) const
|
||||
{
|
||||
return !(*this == otherString);
|
||||
}
|
||||
|
||||
//-----------------------------------------------------------------------------
|
||||
inline bool UTF8StringView::operator== (UTF8StringView otherString) const
|
||||
{
|
||||
if (byteCount && otherString.byteCount && *byteCount != *otherString.byteCount)
|
||||
return false;
|
||||
return operator==(otherString.str);
|
||||
}
|
||||
|
||||
//------------------------------------------------------------------------
|
||||
inline bool UTF8StringView::operator!= (UTF8StringView otherString) const
|
||||
{
|
||||
if (byteCount && otherString.byteCount && *byteCount != *otherString.byteCount)
|
||||
return true;
|
||||
return operator!= (otherString.str);
|
||||
}
|
||||
|
||||
//------------------------------------------------------------------------
|
||||
inline bool UTF8StringView::operator== (const UTF8String& otherString) const
|
||||
{
|
||||
return otherString == str;
|
||||
}
|
||||
|
||||
//------------------------------------------------------------------------
|
||||
inline bool UTF8StringView::operator!= (const UTF8String& otherString) const
|
||||
{
|
||||
return otherString != str;
|
||||
}
|
||||
|
||||
//-----------------------------------------------------------------------------
|
||||
inline UTF8StringView::operator const UTF8StringPtr () const
|
||||
{
|
||||
return str;
|
||||
}
|
||||
|
||||
//-----------------------------------------------------------------------------
|
||||
template<typename BaseIterator>
|
||||
inline UTF8CodePointIterator<BaseIterator>& UTF8CodePointIterator<BaseIterator>::operator++ () noexcept
|
||||
{
|
||||
auto firstByte = *it;
|
||||
|
||||
difference_type offset = 1;
|
||||
|
||||
if (firstByte & kFirstBitMask)
|
||||
{
|
||||
if (firstByte & kThirdBitMask)
|
||||
{
|
||||
if (firstByte & kFourthBitMask)
|
||||
offset = 4;
|
||||
else
|
||||
offset = 3;
|
||||
}
|
||||
else
|
||||
{
|
||||
offset = 2;
|
||||
}
|
||||
}
|
||||
it += offset;
|
||||
return *this;
|
||||
}
|
||||
|
||||
//-----------------------------------------------------------------------------
|
||||
template<typename BaseIterator>
|
||||
inline UTF8CodePointIterator<BaseIterator>& UTF8CodePointIterator<BaseIterator>::operator-- () noexcept
|
||||
{
|
||||
--it;
|
||||
if (*it & kFirstBitMask)
|
||||
{
|
||||
--it;
|
||||
if ((*it & kSecondBitMask) == 0)
|
||||
{
|
||||
--it;
|
||||
if ((*it & kSecondBitMask) == 0)
|
||||
{
|
||||
--it;
|
||||
}
|
||||
}
|
||||
}
|
||||
return *this;
|
||||
}
|
||||
|
||||
//-----------------------------------------------------------------------------
|
||||
template<typename BaseIterator>
|
||||
inline UTF8CodePointIterator<BaseIterator> UTF8CodePointIterator<BaseIterator>::operator++ (int) noexcept
|
||||
{
|
||||
auto result = *this;
|
||||
++(*this);
|
||||
return result;
|
||||
}
|
||||
|
||||
//-----------------------------------------------------------------------------
|
||||
template<typename BaseIterator>
|
||||
inline UTF8CodePointIterator<BaseIterator> UTF8CodePointIterator<BaseIterator>::operator-- (int) noexcept
|
||||
{
|
||||
auto result = *this;
|
||||
--(*this);
|
||||
return result;
|
||||
}
|
||||
|
||||
//-----------------------------------------------------------------------------
|
||||
template<typename BaseIterator>
|
||||
inline bool UTF8CodePointIterator<BaseIterator>::operator== (const UTF8CodePointIterator<BaseIterator>& other) const noexcept
|
||||
{
|
||||
return it == other.it;
|
||||
}
|
||||
|
||||
//-----------------------------------------------------------------------------
|
||||
template<typename BaseIterator>
|
||||
inline bool UTF8CodePointIterator<BaseIterator>::operator!= (const UTF8CodePointIterator<BaseIterator>& other) const noexcept
|
||||
{
|
||||
return it != other.it;
|
||||
}
|
||||
|
||||
//-----------------------------------------------------------------------------
|
||||
template<typename BaseIterator>
|
||||
inline typename UTF8CodePointIterator<BaseIterator>::CodePoint UTF8CodePointIterator<BaseIterator>::operator* () const noexcept
|
||||
{
|
||||
CodePoint codePoint = 0;
|
||||
|
||||
auto firstByte = *it;
|
||||
|
||||
if (firstByte & kFirstBitMask)
|
||||
{
|
||||
if (firstByte & kThirdBitMask)
|
||||
{
|
||||
if (firstByte & kFourthBitMask)
|
||||
{
|
||||
codePoint = static_cast<CodePoint> ((firstByte & 0x07) << 18);
|
||||
auto secondByte = *(it + 1);
|
||||
codePoint += static_cast<CodePoint> ((secondByte & 0x3f) << 12);
|
||||
auto thirdByte = *(it + 2);
|
||||
codePoint += static_cast<CodePoint> ((thirdByte & 0x3f) << 6);
|
||||
auto fourthByte = *(it + 3);
|
||||
codePoint += (fourthByte & 0x3f);
|
||||
}
|
||||
else
|
||||
{
|
||||
codePoint = static_cast<CodePoint> ((firstByte & 0x0f) << 12);
|
||||
auto secondByte = *(it + 1);
|
||||
codePoint += static_cast<CodePoint> ((secondByte & 0x3f) << 6);
|
||||
auto thirdByte = *(it + 2);
|
||||
codePoint += static_cast<CodePoint> ((thirdByte & 0x3f));
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
codePoint = static_cast<CodePoint> ((firstByte & 0x1f) << 6);
|
||||
auto secondByte = *(it + 1);
|
||||
codePoint += (secondByte & 0x3f);
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
codePoint = static_cast<CodePoint> (firstByte);
|
||||
}
|
||||
return codePoint;
|
||||
}
|
||||
|
||||
} // VSTGUI
|
||||
Reference in New Issue
Block a user