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#ifndef maildir_search_h
#define maildir_search_h
/*
** Copyright 2002-2011 Double Precision, Inc.
** See COPYING for distribution information.
*/
/*
** A deterministic automaton-based search mechanism. Search for a particular
** string in a middle of a larger body of text.
**
** Allocate a struct maildir_searchengine by yourself, and call
** maildir_search_init() to initialize.
**
** Call maildir_search_destroy() to release any allocated memory.
**
** Call maildir_search_start_str() to prep the structure for a particular search
** string. Alternatively, call maildir_search_start_unicode() to specify the
** search string as unicode characters. Alternatively,
** call maildir_search_start_str_chset() to specify the search string in
** a specific character. The search string get converted to unicode, then
** converted to lowercase characters, removing leading/trailing whitespace,
** and replacing multiple occurences of whitespace in the search string with
** a single space character.
**
** Call maildir_search_reset() to start the search, then call
** maildir_search_step() for each character in the text. Use
** maildir_search_step_unicode() if the search string was specified via
** maildir_search_start_unicode(). Use maildir_search_step_unicode_lc() if
** the search string was specified using via maildir_search_start_str_chset().
**
** Call maildir_search_found() to check if the search string is found.
*/
#include "config.h"
#include <courier-unicode.h>
#include <string.h>
#include <stdlib.h>
#ifdef __cplusplus
extern "C" {
#endif
struct maildir_searchengine {
char32_t *string;
size_t string_l;
const char32_t *ptr;
unsigned *r; /* Retry backoff indexes */
unsigned i;
int spc;
} ;
#define maildir_search_init(sei) (memset((sei), 0, sizeof(struct maildir_searchengine)))
#define maildir_search_destroy(sei) do { if ((sei)->string) free((sei)->string); if ( (sei)->r) free( (sei)->r); } while (0)
int maildir_search_start_str(struct maildir_searchengine *engine,
const char *string);
int maildir_search_start_str_chset(struct maildir_searchengine *engine,
const char *string,
const char *chset);
int maildir_search_start_unicode(struct maildir_searchengine *engine,
const char32_t *string);
#define maildir_search_reset(si) ((si)->i=0, (si)->ptr=(si)->string)
#define maildir_search_found(si) ((si)->ptr && \
(si)->ptr[(si)->i] == '\0')
#define maildir_search_len(si) ((si)->string_l)
#define maildir_search_step_unicode(sie,ch) do \
{\
if ( (sie)->ptr && (sie)->ptr[(sie)->i]) \
{\
for (;;) \
{\
if ( (char32_t)(sie)->ptr[(sie)->i] == (char32_t)(ch) )\
{ (sie)->i++; break; }\
if ( (sie)->i == 0) break;\
(sie)->i=(sie)->r[(sie)->i];\
}\
}\
} while (0)
#define maildir_search_step_unicode_lc(sie,ch) do \
{ \
char32_t c=(ch); \
int spc=0; \
\
\
if (c == ' ' || c == '\t' || c == '\r' || c == '\n') \
{ \
c=' '; \
spc=1; \
} \
\
if (spc && (sie)->spc) \
; \
else \
{ \
c=unicode_lc(c); \
maildir_search_step_unicode((sie),c); \
} \
\
(sie)->spc=spc; \
} while(0)
#define maildir_search_step(sie,ch) \
maildir_search_step_unicode((sie), ((unsigned char)(ch)))
#define maildir_search_atstart(sie) ((sie)->i == 0)
#ifdef __cplusplus
}
/* A C++ wrapper for the above */
#if HAVE_VECTOR
#include <vector>
#else
#if HAVE_VECTOR_H
#include <vector.h>
#endif
#endif
#include <string>
namespace mail {
class Search {
struct maildir_searchengine sei;
std::string String;
std::vector<unsigned> rbuf;
public:
Search();
virtual ~Search();
size_t getSearchLen()
{
return maildir_search_len(&sei);
}
bool setString(std::string s, std::string chset)
{
String=s;
return maildir_search_start_str_chset(&sei, s.c_str(),
chset.c_str()) == 0;
}
void reset()
{
maildir_search_reset(&sei);
}
void operator<<(char c) { maildir_search_step(&sei, c); }
void operator<<(char32_t ch)
{
maildir_search_step_unicode_lc(&sei, ch);
}
bool atstart() { return maildir_search_atstart(&sei); }
operator bool() { return maildir_search_found(&sei); }
bool operator !() { return ! operator bool(); }
private:
Search(const Search &); /* UNDEFINED */
Search &operator=(const Search &); /* UNDEFINED */
};
}
#endif
#endif
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