source: cpp/frams/util/sstring.h @ 1000

// This file is a part of Framsticks SDK.  http://www.framsticks.com/
// Copyright (C) 1999-2020  Maciej Komosinski and Szymon Ulatowski.
// See LICENSE.txt for details.

#ifndef _SSTRING_H_
#define _SSTRING_H_

#define SSTRING_SIMPLE

#ifdef SSTRING_SIMPLE

// simple sstring implementation using direct character arrays
// - duplicate = copy all characters
// - no mutex needed

#include "sstring-simple.h"

#else
///////////////////////////////////////////////////////////////////////////
// old sstring implementation using SBuf references
// - duplicate = copy buffer pointer
// - mutex required to be thread safe

#include <stdint.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>

class ExtValue;  //this include would result in recurrent inclusion: #include "extvalue.h"
class ExtObject;

class SBuf
{
        char *txt;
        int used;       ///< data size
        int size;       ///< buffer size, not including \0, special case: 0==buffer not allocated
        int refcount;   ///< buffer is used by 'refcount' objects.
        void initEmpty();
        void ensureSize(int wantsize);
        void copyFrom(const char* ch, int chlen = -1);
        void freeBuf();
        void append(const char* ch, int chlen = -1);
        static SBuf &empty();
        SBuf(int initsize);
        friend class SString;
        SBuf(const SBuf& b) {}
public:
        SBuf();
        ~SBuf();
        uint32_t hash() const; // 32-bit FNV-1 hash -> http://en.wikipedia.org/wiki/Fowler_Noll_Vo_hash
};

/// (not so) simple text string class

class SString
{
private:
        SBuf *buf;      ///< buffer
        int appending;  ///< append mode, changes can occur after character # 'appending'
        //int memhint;

        void initEmpty();
        int guessMemSize(int request);
        void copyFrom(SString &from); ///< copy from SString, reference if possible
        void detach(); ///< detach from shared buffer, if any
        void detachEmpty(int ensuresize = 0); ///< detach and make empty
        void detachCopy(int ensuresize = 0); ///< detach and make private copy

public:
        SString(); ///< make an empty string
        SString(const char*t, int t_len = -1); ///< make a string from char*
        SString(int x) = delete; ///< disallow the former 'int' constructor (so the new 'char' version is not used through implicit conversion)
        SString(const SString& from); ///< duplicate string
        SString(SString&& from); ///< move
        SString(char in);
        ~SString();

        void copyFrom(const char* ch, int chlen = -1); ///< copy string, length of -1 == unknown

        void* operator new(size_t s, void* mem) { return mem; }
#ifdef _MSC_VER
        void operator delete(void* mem, void* t) {}
#endif
        void* operator new(size_t s) { return malloc(sizeof(SString)); }
        void operator delete(void* mem) { free(mem); }

        int size() const { return buf->used; } ///< get string length
        int length() const { return buf->used; } ///< get string length
        void shrink(); ///< free unnecessary buffer
        void reserve(int needed) { detachCopy(needed); } ///< like in std::string

        /// after this call, you can modify sstring directly.
        /// returned value is the pointer to the internal buffer.
        /// <B>ensuresize</B> is minimal value of bytes you need,
        /// the buffer will be resized as needed.
        /// all "direct" operations have to leave the buffer with trailing '\0'
        /// at the end. endWrite() will search for this value in order to determine
        /// new string length.
        /// <P>Sample:<CODE>
        /// SString t;
        /// sprintf(t.directWrite(50),"a=%d,b=%f",a,b);
        /// t.endWrite();</CODE>
        char *directWrite(int ensuresize = -1);
        //char *directWrite();
        /// like directWrite, but it returns the pointer to the first char after current string
        /// for easy appending. <B>maxappend</B> is minimum of character in buffer
        /// that can be appended after this call.
        /// <P>Sample:<CODE>
        /// SString t;
        /// sprintf(t.directAppend(10),"c=%d",c);
        /// t.endAppend();</CODE>
        char *directAppend(int maxappend = 0);
        /// update string length, after directWrite.
        /// you don't have to to call endWrite after directWrite if the string's length doesn't change.
        /// optional <B>newlength</B> parameter gives a chance to further optimize
        /// this operation if you know exact length of resulting string.
        /// <P>Sample:<CODE>
        /// SString t("samplestring");
        /// strncpy(t.directWrite(50),src,bytecount);
        /// t.endWrite(bytecount);</CODE>
        void endWrite(int newlength = -1);
        /// update string length, after directAppend.
        /// you will usually need to call endAppend (or endWrite) after directAppend,
        /// because the purpose of directAppend is to change string's length.
        /// optional <B>appendlength</B> parameter gives a chance to further optimize
        /// this operation if you know exact length of the appended string.
        /// <P>Sample:<CODE>
        /// SString t("samplestring");
        /// strncpy(t.directAppend(50),src,bytecount);
        /// t.endAppend(bytecount);</CODE>
        void endAppend(int appendlength = -1);
        int capacity() { return buf->size; } ///< std::string.capacity()

        /// find a character in SString.
        /// return index if the character was found or -1 otherwise.
        int indexOf(int character, int start = 0) const;

        /// find a substring.
        /// return index if the substring was found or -1 otherwise.
        int indexOf(const char *substring, int start = 0) const;

        /// find a substring.
        /// return index if the substring was found or -1 otherwise.
        int indexOf(const SString & substring, int start = 0) const;

        const char* c_str() const { return buf->txt; } ///< get SString's readonly buffer
        //operator char*() {detachCopy(len()); return buf->txt;} ///< get SString's writable buffer
        void operator=(const char*t); ///< assign from const char*
        //void operator=(int x) {free(txt);nowy(x);} ///< clear string and make new empty one
        void operator=(const SString &s);

        void append(const char *txt, int count);
        SString operator+(const SString &s) const;
        void operator+=(int x); ///< append x spaces after current string
        void operator+=(const char*); ///< append char* contents
        void operator+=(const SString&); ///< append other SString

        bool equals(const SString &s) const; ///< TRUE if equal
        bool operator==(const SString &s) const { return equals(s); } ///< TRUE if equal
        bool operator!=(const SString &s) const { return !equals(s); }
        const char* operator()(int p) const { return buf->txt + p; } ///< pointer to p'th character in SString
        char operator[](int i) const { return buf->txt[i]; } ///< get char like in array

        /// return a substring of the current string
        SString substr(int begin, int length = 1 << 30) const;

        /// simple tokenization:
        /// starting at <B>pos</B>, get next substring delimited by <B>separator</B> character
        /// and put it in output parameter <B>token</B>.
        /// <B>pos</B> is moved accordingly.
        /// returns <B>false</B> if no more tokens are available or <B>true</B> otherwise.
        bool getNextToken(int& pos, SString &token, char separator) const;

        void operator+=(char ch) { directAppend(1)[0] = ch; endAppend(1); } ///< append single character

        bool startsWith(const char *pattern) const;
        char charAt(int pos) const { return buf->txt[pos]; }
        uint32_t hash() const { return buf->hash(); }

        static SString valueOf(int);
        static SString valueOf(long);
        static SString valueOf(double);
        static SString valueOf(const SString&); //tylko do kompletu zeby mozna uzyc tej funkcji nie martwiac sie o typ argumentu
        static SString valueOf(const ExtValue&); //tylko do kompletu zeby mozna uzyc tej funkcji nie martwiac sie o typ argumentu
        static SString valueOf(const ExtObject&); //tylko do kompletu zeby mozna uzyc tej funkcji nie martwiac sie o typ argumentu
        static SString sprintf(const char* format, ...);

        static SString &empty();
};

#endif //#ifdef SSTRING_SIMPLE

#endif