--- parser3/src/include/pa_string.h 2001/01/26 18:34:02 1.2 +++ parser3/src/include/pa_string.h 2003/12/17 07:34:11 1.154 @@ -1,93 +1,507 @@ -/* - $Id: pa_string.h,v 1.2 2001/01/26 18:34:02 paf Exp $ -*/ - -/* - - String Chunk0 - ====== ======== - head--------->[ptr, size] - append_here-------->[ptr, size] - link_row ........ - . . - . [ptr, size] - ...........>[link to the next chunk] +/** @file + Parser: string class decl. + Copyright (c) 2001-2003 ArtLebedev Group (http://www.artlebedev.com) + Author: Alexandr Petrosian (http://paf.design.ru) */ #ifndef PA_STRING_H #define PA_STRING_H -#include +static const char * const IDENT_STRING_H="$Date: 2003/12/17 07:34:11 $"; -class Pool; +// includes + +#include "pa_types.h" +#include "pa_array.h" + +extern "C" { // cord's author forgot to do that +#define CORD_NO_IO +#include "cord.h" +}; -class String { +// cord extension +/* Returns true if x does contain */ +/* char not_c at positions i..i+n. Value i,i+n must be < CORD_len(x). */ +int CORD_range_contains_chr_greater_then(CORD x, size_t i, size_t n, int c); +size_t CORD_block_count(CORD x); + +// forwards + +class Charset; +class Table; +class SQL_Connection; +class Dictionary; +class Request_charsets; +class String; +typedef Array ArrayString; + +/// this is result of pos functions which mean that substr were not found +#define STRING_NOT_FOUND ((size_t)-1) + +template +inline size_t get_length(T current) { + return current; +} + +/** + String which knows the lang of all it's langs. + + All pieces remember + - whether they are tainted or not, + and the lang which should be used to detaint them +*/ +class String: public PA_Object { public: - enum { - CR_PREALLOCATED_COUNT=5, - CR_GROW_PERCENT=60 + + /** piece is tainted or not. the lang to use when detaint + remember to change String_Untaint_lang_name @ untaint.C along + + WARNING WARNING WARNING WARNING WARNING WARNING + + pos function compares(<=) languages, that is used in searching + for table column separator being L_CLEAN or L_AS_IS. + they search for AS_IS, meaning AS_IS|CLEAN [doing <=L_AS_IS check]. + + letters assigned for debugging, but it's important for no language-letter + come before L_AS_IS other then L_CLEAN + + WARNING WARNING WARNING WARNING WARNING WARNING + */ + enum Language { + L_UNSPECIFIED=0, ///< no real string has parts of this lange: it's just convinient to check when string's empty + // these two must go before others, there are checks for >L_AS_IS + L_CLEAN='0', ///< clean WARNING: read above warning before changing + L_AS_IS='A', ///< leave all characters intact WARNING: read above warning before changing + + L_PASS_APPENDED='P', + /**< + leave lang built into string being appended. + just a flag, that value not stored + */ + L_TAINTED='T', ///< tainted, untaint lang as assigned later + // untaint langs. assigned by ^untaint[lang]{...} + L_FILE_SPEC='F', ///< file specification + L_HTTP_HEADER='h', ///< text in HTTP response header + L_MAIL_HEADER='m', ///< text in mail header + L_URI='U', ///< text in uri + L_TABLE='L', ///< ^table:set body + L_SQL='Q', ///< ^table:sql body + L_JS='J', ///< JavaScript code + L_XML='X', ///< ^dom:set xml + L_HTML='H', ///< HTML code (for editing) + // READ WARNING ABOVE BEFORE ADDING ANYTHING + L_OPTIMIZE_BIT = 0x80 ///< flag, requiring cstr whitespace optimization + }; + + union Languages { + + struct { + Language lang:8; + int is_not_just_lang:sizeof(CORD)*8-8; + } opt; + CORD langs; + + template + CORD make_langs(C current) const { + return opt.is_not_just_lang? + langs + :CORD_chars((char)opt.lang, get_length(current)); + } + + CORD make_langs(size_t aoffset, size_t alength) const { + return opt.is_not_just_lang? + CORD_substr(langs, aoffset, alength) + :CORD_chars((char)opt.lang, alength); + } + + /// appending when 'langs' already contain something [simple cases hanled elsewhere] + template + void append(C current, + const CORD to_nonempty_target_langs) { + assert(langs); + + if(opt.is_not_just_lang) + langs=CORD_cat(langs, to_nonempty_target_langs); + else { // we were "just lang" + size_t current_size=get_length(current); + assert(current_size); + langs=CORD_cat( + CORD_chars((char)opt.lang, current_size), // first piece [making from just 'lang'] + to_nonempty_target_langs); // new piece + } + } + + public: + + const char* v() const; + + Languages(): langs(0) {} + Languages(Language alang) { + opt.lang=alang; + opt.is_not_just_lang=0; + } + + /// MUST be called exactly prior to modification of current [uses it's length] + template + void append(C current, Language alang, size_t asize) { + assert(alang); + assert(asize); + + if(!opt.is_not_just_lang) + if(opt.lang) { + if(opt.lang==alang) // same length? ignoring + return; + } else { + opt.lang=alang; // to uninitialized + return; + } + + append(current, CORD_chars((char)alang, asize)); + } + + /// MUST be called exactly prior to modification of current [uses it's length] + template + void append(C current, size_t appending_length, + const Languages src) { + assert(appending_length); + + if(!langs) + langs=src.langs; // to uninitialized + else if(!src.opt.is_not_just_lang) + append(current, src.opt.lang, appending_length); // simplifying when simple source + else + append(current, src.make_langs(appending_length)); + } + + /// MUST be called exactly prior to modification of current [uses it's length] + template + void append(C current, + const Languages src, size_t aoffset, size_t alength) { + assert(alength); + + if(!langs) // to uninitialized? + if(src.opt.is_not_just_lang) + langs=CORD_substr(src.langs, aoffset, alength); // to uninitialized complex + else + opt.lang=src.opt.lang; // to uninitialized simple + else + if(!opt.is_not_just_lang && !src.opt.is_not_just_lang && opt.lang==src.opt.lang) // both simple & of same language? + return; // ignoring + else + append(current, src.make_langs(aoffset, alength)); + } + + /// checks if we have lang<=alang all from aoffset to aoffset+alength + bool check_lang(Language alang, size_t aoffset, size_t alength) const { + if(alang==L_UNSPECIFIED) // ignore lang? + return true; + + if(opt.is_not_just_lang) + return CORD_range_contains_chr_greater_then(langs, aoffset, alength, (unsigned)alang)==0; + else + return opt.lang<=alang; + } + + /// @returns count of blocks + /// @todo currently there can be adjucent blocks of same language. someday merge them + size_t count() const { + return opt.is_not_just_lang? + CORD_block_count(langs) + : opt.lang? + 1 + : 0; + }; + + template + void for_each(C current, + int callback(char, size_t, I), I info) const { + + if(opt.is_not_just_lang) + CORD_block_iter(langs, 0, (CORD_block_iter_fn)callback, info); + else + callback(opt.lang, get_length(current), info); + } + + bool invariant(size_t current_length) { + if(!langs) + return current_length==0; + if(opt.is_not_just_lang) + return CORD_len(langs)==current_length; + return true; // uncheckable, actually + } + }; + + class Body { + + CORD body; + + public: + + const char* v() const; + + Body(): body(CORD_EMPTY) {} + Body(CORD abody): body(abody) { + assert(!body // no body + || *body // ordinary string + || body[1]==1 // CONCAT_HDR + || body[1]==4 // FN_HDR + || body[1]==6 // SUBSTR_HDR + ); + } + /// WARNING: length is only HELPER length, str in ANY case should be zero-terminated + Body(const char* str, size_t helper_length): body(CORD_EMPTY) { + append_know_length(str, helper_length?helper_length:strlen(str)); + } + static Body Format(int value); + + void clear() { body=CORD_EMPTY; } + + bool operator! () const { return is_empty(); } + + uint hash_code() const; + + const char* cstr() const { return CORD_to_const_char_star(body); } + char* cstrm() const { return CORD_to_char_star(body); } + + size_t length() const { return CORD_len(body); } + + bool is_empty() const { return body==CORD_EMPTY; } + + void append_know_length(const char *str, size_t known_length) { + if(known_length) + body=CORD_cat_char_star(body, str, known_length); + } + void append_strdup_know_length(const char* str, size_t known_length) { + if(known_length) + append_know_length(pa_strdup(str, known_length), known_length); + } + void append(char c) { body=CORD_cat_char(body, c); } + Body& operator << (const Body src) { body=CORD_cat(body, src.body); return *this; } + Body& operator << (const char* str) { append_know_length(str, strlen(str)); return *this; } + + // could not figure out why this operator is needed [should do this chain: string->simple->==] + bool operator < (const Body src) const { return CORD_cmp(body, src.body)<0; } + bool operator > (const Body src) const { return CORD_cmp(body, src.body)>0; } + bool operator <= (const Body src) const { return CORD_cmp(body, src.body)<=0; } + bool operator >= (const Body src) const { return CORD_cmp(body, src.body)>=0; } + bool operator != (const Body src) const { return CORD_cmp(body, src.body)!=0; } + bool operator == (const Body src) const { return CORD_cmp(body, src.body)==0; } + + int ncmp(size_t x_begin, const Body y, size_t y_begin, size_t size) const { + return CORD_ncmp(body, x_begin, y.body, y_begin, size); + } + + char fetch(size_t index) const { return CORD_fetch(body, index); } + Body mid(size_t index, size_t length) const { return CORD_substr(body, index, length); } + size_t pos(const char* substr, size_t offset=0) const { return CORD_str(body, offset, substr); } + size_t pos(const Body substr, size_t offset=0) const { + if(!substr.length()) + return STRING_NOT_FOUND; // in this case CORD_str returns 0 [parser users got used to -1] + + // CORD_str checks for bad offset [CORD_chr does not] + return CORD_str(body, offset, substr.body); + } + size_t pos(char c, + size_t offset=0) const { + if(offset>=length()) // CORD_chr does not check that [and ABORT's in that case] + return STRING_NOT_FOUND; + + return CORD_chr(body, offset, c); + } + + template void for_each( + int (*f1)(char c, I), + int (*f2)(const char* s, I), + I info) const { + CORD_iter5(body, 0, (CORD_iter_fn)f1, (CORD_batched_iter_fn)f2, info); + } + + void set_pos(CORD_pos& pos, size_t index) const { CORD_set_pos(pos, body, index); } + + /*Body normalize() const { + return Body(CORD_balance(body)); + }*/ + }; + + struct C { + const char *str; + size_t length; + operator const char *() { return str; } + C(const char *astr, size_t asize): str(astr), length(asize) {} + }; + + struct Cm { + char *str; + size_t length; + //operator char *() { return str; } + Cm(char *astr, size_t asize): str(astr), length(asize) {} }; private: - friend Pool; - // the pool I'm allocated on - Pool *pool; + Body body; ///< all characters of string + Languages langs; ///< string characters lang - // last chank allocated count cache - int curr_chunk_rows; - struct Chunk { - // the number of rows per chunk - int count; - union Row { - // chunk item - struct { - char *ptr; // pointer to the start of string fragment - size_t size; // length of the fragment - } item; - Chunk *link; // link to the next chunk in chain - } rows[CR_PREALLOCATED_COUNT]; - // next rows are here - Chunk *preallocated_link; - } - head; // the head chunk of the chunk chain - - // next append would write to this record - Chunk::Row *append_here; - - // the address of place where lies address - // of the link to the next chunk to allocate - Chunk::Row *link_row; - - // new&constructors made private to enforce factory manufacturing at pool - void *operator new(size_t size, Pool *apool); - - void construct(Pool *apool); - String() { /* never */} - String(Pool *apool) { - construct(apool); - } - String(Pool *apool, char *src) { - construct(apool); - *this+=src; + const char* v() const; + +#define ASSERT_STRING_INVARIANT(string) \ + assert((string).langs.invariant((string).body.length())) + +public: + + static const String Empty; + + explicit String(const char* cstr=0, size_t helper_length=0, bool tainted=false); + explicit String(const C cstr, bool tainted=false); + String(Body abody, Language alang): body(abody), langs(alang) { + ASSERT_STRING_INVARIANT(*this); + } + String(const String& src): body(src.body), langs(src.langs) { + ASSERT_STRING_INVARIANT(*this); } - bool chunk_is_full() { - return append_here == link_row; + /// for convinient hash lookup + operator const Body() const { return body; } + + bool is_empty() const { return body.is_empty(); } + size_t length() const { return body.length(); } + + /// convert to CORD. if 'lang' known, forcing 'lang' to it + Body cstr_to_string_body(Language lang=L_AS_IS, + SQL_Connection* connection=0, + const Request_charsets *charsets=0) const; + + /// convert to constant C string. if 'lang' known, forcing 'lang' to it + const char* cstr(Language lang=L_AS_IS, + SQL_Connection* connection=0, + const Request_charsets *charsets=0) const { + return cstr_to_string_body(lang, connection, charsets).cstr(); + } + /// convert to Modifiable C string. if 'lang' known, forcing 'lang' to it + char *cstrm(Language lang=L_AS_IS, + SQL_Connection* connection=0, + const Request_charsets *charsets=0) const { + return cstr_to_string_body(lang, connection, charsets).cstrm(); + } + /// puts pieces to buf + Cm serialize(size_t prolog_size) const; + /// appends pieces from buf to self + bool deserialize(size_t prolog_size, void *buf, size_t buf_size); + /// @see Body::append_know_length + String& append_know_length(const char* str, size_t known_length, Language lang); + /// @see Body::append_help_length + String& append_help_length(const char* str, size_t helper_length, Language lang); + String& append_strdup(const char* str, size_t helper_length, Language lang); + + bool operator == (const char* y) const { return body==Body(y); } + bool operator != (const char* y) const { return body!=Body(y); } + + /// this starts with y + bool starts_with(const char* y) const { + return body.ncmp(0/*x_begin*/, Body(y), 0/*y_begin*/, strlen(y))==0; + } + /// x starts with this + bool this_starts(const char* x) const { + return Body(x).ncmp(0/*x_begin*/, body, 0/*y_begin*/, length())==0; } - void expand(); - int used_rows(); -public: + String& append_to(String& dest, Language lang, bool forced) const; + String& append(const String& src, Language lang, bool forced=false) { + return src.append_to(*this, lang, forced); + } + String& operator << (const String& src) { return append(src, L_PASS_APPENDED); } + String& operator << (const char* src) { return append_help_length(src, 0, L_AS_IS); } + String& operator << (const Body src); + + /// extracts first char of a string, if any + char first_char() const { + return is_empty()?0:body.fetch(0); + } + + bool operator < (const String& src) const { return body (const String& src) const { return body>src.body; } + bool operator <= (const String& src) const { return body<=src.body; } + bool operator >= (const String& src) const { return body>=src.body; } + bool operator != (const String& src) const { return body!=src.body; } + bool operator == (const String& src) const { return body==src.body; } + + /// extracts [start, finish) piece of string + String& mid(size_t substr_begin, size_t substr_end) const; + + /** + ignore lang if it's L_UNSPECIFIED + but when specified: look for substring that lies in ONE fragment in THAT lang + @return position of substr in string, -1 means "not found" [const char* version] + */ + size_t pos(const Body substr, + size_t this_offset=0, Language lang=L_UNSPECIFIED) const; + /// String version of @see pos(const char*, int, Language) + size_t pos(const String& substr, + size_t this_offset=0, Language lang=L_UNSPECIFIED) const; + size_t pos(char c, + size_t this_offset=0) const { + return body.pos(c, this_offset); + } - String(String& src); - size_t size(); - char *c_str(); - String& operator += (char *src); - bool operator == (String& src); + void split(ArrayString& result, + size_t& pos_after, + const char* delim, + Language lang=L_UNSPECIFIED, int limit=-1) const; + void split(ArrayString& result, + size_t& pos_after, + const String& delim, + Language lang=L_UNSPECIFIED, int limit=-1) const; + + typedef void (*Row_action)(Table& table, ArrayString* row, + int prestart, int prefinish, + int poststart, int postfinish, + void *info); + /** + @return table of found items, if any. + table format is defined and fixed[can be used by others]: + @verbatim + prematch/match/postmatch/1/2/3/... + @endverbatim + */ + Table* match(Charset& source_charset, + const String& regexp, + const String* options, + Row_action row_action, void *info, + bool& just_matched) const; + enum Change_case_kind { + CC_UPPER, + CC_LOWER + }; + String& change_case(Charset& source_charset, + Change_case_kind kind) const; + const String& replace(const Dictionary& dict) const; + double as_double() const; + int as_int() const; + +private: //disabled + + String& operator = (const String&) { return *this; } - unsigned int hash_code(); }; +template<> +inline size_t get_length(String::Body body) { + return body.length(); +} + +/// simple hash code of string. used by Hash +inline uint hash_code(const String::Body self) { + return self.hash_code(); +} + + +/// now that we've declared specialization we can use it +inline String& String::operator << (const String::Body src) { + langs.append(body, L_AS_IS, src.length()); + body<