source: cpp/frams/util/sstring-simple.h @ 851

Last change on this file since 851 was 793, checked in by Maciej Komosinski, 6 years ago

Code formatting

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File size: 6.0 KB
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1#ifndef _SSTRING_SIMPLE_H_
2#define _SSTRING_SIMPLE_H_
3
4#include <stdint.h>
5#include <string.h>
6#include <stdlib.h>
7#include <stdio.h>
8
9class ExtValue;  //this include would result in recurrent inclusion: #include "extvalue.h"
10class ExtObject;
11
12class SString
13{
14private:
15        char *txt;      ///< string buffer or NULL for empty string
16        int size;       ///< allocated memory (including \0)
17        int used;       ///< string length
18        int appending;  ///< append mode, changes can occur after character # 'appending'
19
20        void initEmpty();
21        void copyFrom(SString &from); ///< copy from SString
22        void resize(int newsize);
23        void ensureSize(int needed);
24        const char* getPtr() const { return txt ? txt : ""; }
25
26public:
27        SString(); ///< make an empty string
28        SString(const char*t, int t_len = -1); ///< make a string from char*
29        SString(int x); ///< string with initial buffer allocated for x characters
30        SString(const SString& from); ///< duplicate string
31        SString(SString&& from);///< move
32        ~SString();
33
34        void copyFrom(const char* ch, int chlen = -1); ///< copy string, length of -1 == unknown
35
36        void* operator new(size_t s, void* mem){ return mem; }
37#ifdef _MSC_VER
38                void operator delete(void* mem, void* t) {}
39#endif
40        void* operator new(size_t s){ return malloc(sizeof(SString)); }
41        void operator delete(void* mem) { free(mem); }
42
43        int len() const { return used; } ///< get string length
44        void shrink(); ///< free unnecessary buffer
45
46        /// after this call, you can modify sstring directly.
47        /// returned value is the pointer to the internal buffer.
48        /// <B>ensuresize</B> is minimal value of bytes you need,
49        /// the buffer will be resized as needed.
50        /// all "direct" operations have to leave the buffer with trailing '\0'
51        /// at the end. endWrite() will search for this value in order to determine
52        /// new string length.
53        /// <P>Sample:<CODE>
54        /// SString t;
55        /// sprintf(t.directWrite(50),"a=%d,b=%f",a,b);
56        /// t.endWrite();</CODE>
57        char *directWrite(int ensuresize = -1);
58        //char *directWrite();
59        /// like directWrite, but it returns the pointer to the first char after current string
60        /// for easy appending. <B>maxappend</B> is minimum of character in buffer
61        /// that can be appended after this call.
62        /// <P>Sample:<CODE>
63        /// SString t;
64        /// sprintf(t.directAppend(10),"c=%d",c);
65        /// t.endAppend();</CODE>
66        char *directAppend(int maxappend = 0);
67        /// update string length, after directWrite.
68        /// you don't have to to call endWrite after directWrite if the string's length doesn't change.
69        /// optional <B>newlength</B> parameter gives a chance to further optimize
70        /// this operation if you know exact length of resulting string.
71        /// <P>Sample:<CODE>
72        /// SString t("samplestring");
73        /// strncpy(t.directWrite(50),src,bytecount);
74        /// t.endWrite(bytecount);</CODE>
75        void endWrite(int newlength = -1);
76        /// update string length, after directAppend.
77        /// you will usually need to call endAppend (or endWrite) after directAppend,
78        /// because the purpose of directAppend is to change string's length.
79        /// optional <B>appendlength</B> parameter gives a chance to further optimize
80        /// this operation if you know exact length of the appended string.
81        /// <P>Sample:<CODE>
82        /// SString t("samplestring");
83        /// strncpy(t.directAppend(50),src,bytecount);
84        /// t.endAppend(bytecount);</CODE>
85        void endAppend(int appendlength = -1);
86
87        void memoryHint(int howbig) { ensureSize(howbig); }
88        int directMaxLen() { return size - 1; } ///< when called after directWrite: max number of characters allowed (can be more than requested)
89
90        /// find a character in SString.
91        /// return index if the character was found or -1 otherwise.
92        int indexOf(int character, int start = 0) const;
93
94        /// find a substring.
95        /// return index if the substring was found or -1 otherwise.
96        int indexOf(const char *substring, int start = 0) const;
97
98        /// find a substring.
99        /// return index if the substring was found or -1 otherwise.
100        int indexOf(const SString & substring, int start = 0) const;
101
102        const char* c_str() const { return getPtr(); } ///< get SString's readonly buffer
103        void operator=(const char*t); ///< assign from const char*
104        void operator=(const SString &s);
105
106        void append(const char *t, int n);
107        SString operator+(const SString &s) const;
108        void operator+=(int x); ///< append x spaces after current string
109        void operator+=(const char*); ///< append char* contents
110        void operator+=(const SString&); ///< append other SString
111
112        bool equals(const SString &s) const; ///< TRUE if equal
113        bool operator==(const SString &s) const { return equals(s); } ///< TRUE if equal
114        bool operator!=(const SString &s) const { return !equals(s); } ///< TRUE if not equal
115        bool operator<(const SString &s) const { return strcmp(getPtr(), s.getPtr()) < 1; }
116        const char* operator()(int p) const { return getPtr() + p; } ///< pointer to p'th character in SString
117        char operator[](int i) const { return getPtr()[i]; } ///< get char like in array
118
119        /// return a substring of the current string
120        SString substr(int begin, int length = 1 << 30) const;
121
122        /// simple tokenization:
123        /// starting at <B>pos</B>, get next substring delimited by <B>separator</B> character
124        /// and put it in output parameter <B>token</B>.
125        /// <B>pos</B> is moved accordingly.
126        /// returns <B>false</B> if no more tokens are available or <B>true</B> otherwise.
127        bool getNextToken(int& pos, SString &token, char separator) const;
128
129        void operator+=(char ch) { directAppend(1)[0] = ch; endAppend(1); } ///< append single character
130
131        bool startsWith(const char *pattern) const;
132        char charAt(int pos) const { return operator[](pos); }
133        uint32_t hash() const;
134
135        static SString valueOf(int);
136        static SString valueOf(long);
137        static SString valueOf(double);
138        static SString valueOf(const SString&); //tylko do kompletu zeby mozna uzyc tej funkcji nie martwiac sie o typ argumentu
139        static SString valueOf(const ExtValue&); //tylko do kompletu zeby mozna uzyc tej funkcji nie martwiac sie o typ argumentu
140        static SString valueOf(const ExtObject&); //tylko do kompletu zeby mozna uzyc tej funkcji nie martwiac sie o typ argumentu
141        static SString sprintf(const char* format, ...);
142
143        static SString &empty();
144};
145
146#endif
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