4485d0d966
when libutils is statically linked, the ordering of the static initializer is not guaranteed and therefore it's unsafe to use empty static strings: e.g.: static String8 sThisStaticStringIsNotSafe; instead, this new constructor can be used: static String8 sThisStaticStringIsSafe(kEmptyString); Change-Id: Ia3daf1cab1c97d021c0ee9c2b394b5e27e8d6c0d
395 lines
12 KiB
C++
395 lines
12 KiB
C++
/*
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* Copyright (C) 2005 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_STRING8_H
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#define ANDROID_STRING8_H
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#include <utils/Errors.h>
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#include <utils/SharedBuffer.h>
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#include <utils/Unicode.h>
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#include <utils/TypeHelpers.h>
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#include <string.h> // for strcmp
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#include <stdarg.h>
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// ---------------------------------------------------------------------------
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namespace android {
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class String16;
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class TextOutput;
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//! This is a string holding UTF-8 characters. Does not allow the value more
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// than 0x10FFFF, which is not valid unicode codepoint.
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class String8
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{
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public:
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/* use String8(StaticLinkage) if you're statically linking against
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* libutils and declaring an empty static String8, e.g.:
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*
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* static String8 sAStaticEmptyString(String8::kEmptyString);
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* static String8 sAnotherStaticEmptyString(sAStaticEmptyString);
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*/
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enum StaticLinkage { kEmptyString };
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String8();
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explicit String8(StaticLinkage);
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String8(const String8& o);
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explicit String8(const char* o);
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explicit String8(const char* o, size_t numChars);
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explicit String8(const String16& o);
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explicit String8(const char16_t* o);
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explicit String8(const char16_t* o, size_t numChars);
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explicit String8(const char32_t* o);
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explicit String8(const char32_t* o, size_t numChars);
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~String8();
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static inline const String8 empty();
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static String8 format(const char* fmt, ...) __attribute__((format (printf, 1, 2)));
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static String8 formatV(const char* fmt, va_list args);
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inline const char* string() const;
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inline size_t size() const;
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inline size_t length() const;
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inline size_t bytes() const;
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inline bool isEmpty() const;
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inline const SharedBuffer* sharedBuffer() const;
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void clear();
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void setTo(const String8& other);
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status_t setTo(const char* other);
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status_t setTo(const char* other, size_t numChars);
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status_t setTo(const char16_t* other, size_t numChars);
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status_t setTo(const char32_t* other,
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size_t length);
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status_t append(const String8& other);
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status_t append(const char* other);
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status_t append(const char* other, size_t numChars);
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status_t appendFormat(const char* fmt, ...)
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__attribute__((format (printf, 2, 3)));
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status_t appendFormatV(const char* fmt, va_list args);
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// Note that this function takes O(N) time to calculate the value.
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// No cache value is stored.
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size_t getUtf32Length() const;
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int32_t getUtf32At(size_t index,
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size_t *next_index) const;
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void getUtf32(char32_t* dst) const;
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inline String8& operator=(const String8& other);
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inline String8& operator=(const char* other);
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inline String8& operator+=(const String8& other);
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inline String8 operator+(const String8& other) const;
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inline String8& operator+=(const char* other);
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inline String8 operator+(const char* other) const;
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inline int compare(const String8& other) const;
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inline bool operator<(const String8& other) const;
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inline bool operator<=(const String8& other) const;
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inline bool operator==(const String8& other) const;
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inline bool operator!=(const String8& other) const;
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inline bool operator>=(const String8& other) const;
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inline bool operator>(const String8& other) const;
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inline bool operator<(const char* other) const;
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inline bool operator<=(const char* other) const;
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inline bool operator==(const char* other) const;
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inline bool operator!=(const char* other) const;
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inline bool operator>=(const char* other) const;
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inline bool operator>(const char* other) const;
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inline operator const char*() const;
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char* lockBuffer(size_t size);
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void unlockBuffer();
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status_t unlockBuffer(size_t size);
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// return the index of the first byte of other in this at or after
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// start, or -1 if not found
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ssize_t find(const char* other, size_t start = 0) const;
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void toLower();
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void toLower(size_t start, size_t numChars);
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void toUpper();
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void toUpper(size_t start, size_t numChars);
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/*
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* These methods operate on the string as if it were a path name.
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*/
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/*
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* Set the filename field to a specific value.
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*
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* Normalizes the filename, removing a trailing '/' if present.
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*/
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void setPathName(const char* name);
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void setPathName(const char* name, size_t numChars);
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/*
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* Get just the filename component.
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*
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* "/tmp/foo/bar.c" --> "bar.c"
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*/
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String8 getPathLeaf(void) const;
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/*
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* Remove the last (file name) component, leaving just the directory
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* name.
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*
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* "/tmp/foo/bar.c" --> "/tmp/foo"
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* "/tmp" --> "" // ????? shouldn't this be "/" ???? XXX
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* "bar.c" --> ""
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*/
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String8 getPathDir(void) const;
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/*
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* Retrieve the front (root dir) component. Optionally also return the
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* remaining components.
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*
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* "/tmp/foo/bar.c" --> "tmp" (remain = "foo/bar.c")
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* "/tmp" --> "tmp" (remain = "")
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* "bar.c" --> "bar.c" (remain = "")
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*/
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String8 walkPath(String8* outRemains = NULL) const;
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/*
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* Return the filename extension. This is the last '.' and any number
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* of characters that follow it. The '.' is included in case we
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* decide to expand our definition of what constitutes an extension.
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*
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* "/tmp/foo/bar.c" --> ".c"
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* "/tmp" --> ""
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* "/tmp/foo.bar/baz" --> ""
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* "foo.jpeg" --> ".jpeg"
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* "foo." --> ""
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*/
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String8 getPathExtension(void) const;
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/*
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* Return the path without the extension. Rules for what constitutes
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* an extension are described in the comment for getPathExtension().
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*
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* "/tmp/foo/bar.c" --> "/tmp/foo/bar"
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*/
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String8 getBasePath(void) const;
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/*
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* Add a component to the pathname. We guarantee that there is
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* exactly one path separator between the old path and the new.
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* If there is no existing name, we just copy the new name in.
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*
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* If leaf is a fully qualified path (i.e. starts with '/', it
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* replaces whatever was there before.
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*/
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String8& appendPath(const char* leaf);
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String8& appendPath(const String8& leaf) { return appendPath(leaf.string()); }
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/*
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* Like appendPath(), but does not affect this string. Returns a new one instead.
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*/
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String8 appendPathCopy(const char* leaf) const
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{ String8 p(*this); p.appendPath(leaf); return p; }
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String8 appendPathCopy(const String8& leaf) const { return appendPathCopy(leaf.string()); }
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/*
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* Converts all separators in this string to /, the default path separator.
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*
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* If the default OS separator is backslash, this converts all
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* backslashes to slashes, in-place. Otherwise it does nothing.
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* Returns self.
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*/
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String8& convertToResPath();
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private:
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status_t real_append(const char* other, size_t numChars);
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char* find_extension(void) const;
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const char* mString;
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};
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// String8 can be trivially moved using memcpy() because moving does not
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// require any change to the underlying SharedBuffer contents or reference count.
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ANDROID_TRIVIAL_MOVE_TRAIT(String8)
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// ---------------------------------------------------------------------------
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// No user servicable parts below.
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inline int compare_type(const String8& lhs, const String8& rhs)
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{
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return lhs.compare(rhs);
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}
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inline int strictly_order_type(const String8& lhs, const String8& rhs)
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{
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return compare_type(lhs, rhs) < 0;
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}
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inline const String8 String8::empty() {
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return String8();
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}
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inline const char* String8::string() const
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{
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return mString;
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}
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inline size_t String8::length() const
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{
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return SharedBuffer::sizeFromData(mString)-1;
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}
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inline size_t String8::size() const
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{
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return length();
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}
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inline bool String8::isEmpty() const
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{
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return length() == 0;
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}
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inline size_t String8::bytes() const
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{
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return SharedBuffer::sizeFromData(mString)-1;
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}
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inline const SharedBuffer* String8::sharedBuffer() const
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{
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return SharedBuffer::bufferFromData(mString);
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}
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inline String8& String8::operator=(const String8& other)
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{
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setTo(other);
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return *this;
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}
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inline String8& String8::operator=(const char* other)
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{
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setTo(other);
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return *this;
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}
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inline String8& String8::operator+=(const String8& other)
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{
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append(other);
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return *this;
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}
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inline String8 String8::operator+(const String8& other) const
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{
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String8 tmp(*this);
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tmp += other;
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return tmp;
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}
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inline String8& String8::operator+=(const char* other)
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{
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append(other);
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return *this;
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}
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inline String8 String8::operator+(const char* other) const
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{
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String8 tmp(*this);
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tmp += other;
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return tmp;
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}
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inline int String8::compare(const String8& other) const
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{
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return strcmp(mString, other.mString);
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}
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inline bool String8::operator<(const String8& other) const
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{
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return strcmp(mString, other.mString) < 0;
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}
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inline bool String8::operator<=(const String8& other) const
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{
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return strcmp(mString, other.mString) <= 0;
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}
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inline bool String8::operator==(const String8& other) const
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{
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return strcmp(mString, other.mString) == 0;
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}
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inline bool String8::operator!=(const String8& other) const
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{
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return strcmp(mString, other.mString) != 0;
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}
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inline bool String8::operator>=(const String8& other) const
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{
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return strcmp(mString, other.mString) >= 0;
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}
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inline bool String8::operator>(const String8& other) const
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{
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return strcmp(mString, other.mString) > 0;
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}
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inline bool String8::operator<(const char* other) const
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{
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return strcmp(mString, other) < 0;
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}
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inline bool String8::operator<=(const char* other) const
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{
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return strcmp(mString, other) <= 0;
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}
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inline bool String8::operator==(const char* other) const
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{
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return strcmp(mString, other) == 0;
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}
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inline bool String8::operator!=(const char* other) const
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{
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return strcmp(mString, other) != 0;
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}
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inline bool String8::operator>=(const char* other) const
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{
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return strcmp(mString, other) >= 0;
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}
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inline bool String8::operator>(const char* other) const
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{
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return strcmp(mString, other) > 0;
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}
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inline String8::operator const char*() const
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{
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return mString;
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}
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} // namespace android
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// ---------------------------------------------------------------------------
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#endif // ANDROID_STRING8_H
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