2008 lines
43 KiB
C
2008 lines
43 KiB
C
/*
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* $Id: rex.c 154 2008-03-21 13:02:20Z baconevi $
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*
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* {License}
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*/
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#include <ase/cmn/rex.h>
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#include <ase/cmn/mem.h>
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#ifdef DEBUG_REX
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#include <ase/utl/stdio.h>
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#endif
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enum
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{
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CT_EOF,
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CT_SPECIAL,
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CT_NORMAL
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};
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enum
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{
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LEVEL_TOP,
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LEVEL_CHARSET,
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LEVEL_RANGE
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};
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enum
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{
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CMD_BOL,
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CMD_EOL,
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CMD_ANY_CHAR,
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CMD_ORD_CHAR,
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CMD_CHARSET,
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CMD_GROUP
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};
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enum
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{
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CHARSET_ONE,
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CHARSET_RANGE,
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CHARSET_CLASS
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};
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enum
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{
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CHARSET_CLASS_PUNCT,
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CHARSET_CLASS_SPACE,
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CHARSET_CLASS_DIGIT,
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CHARSET_CLASS_ALNUM
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};
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#define DEF_CODE_CAPA 512
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#define BOUND_MIN 0
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#define BOUND_MAX (ASE_TYPE_MAX(ase_size_t))
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typedef struct builder_t builder_t;
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typedef struct matcher_t matcher_t;
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typedef struct match_t match_t;
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typedef struct code_t code_t;
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typedef struct rhdr_t rhdr_t;
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typedef struct bhdr_t bhdr_t;
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typedef struct cshdr_t cshdr_t;
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struct builder_t
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{
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ase_mmgr_t* mmgr;
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struct
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{
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const ase_char_t* ptr;
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const ase_char_t* end;
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const ase_char_t* curp;
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struct
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{
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int type;
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ase_char_t value;
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ase_bool_t escaped;
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} curc;
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} ptn;
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struct
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{
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ase_byte_t* buf;
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ase_size_t size;
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ase_size_t capa;
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} code;
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struct
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{
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ase_size_t max;
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ase_size_t cur;
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} depth;
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int errnum;
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};
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struct matcher_t
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{
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ase_mmgr_t* mmgr;
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ase_ccls_t* ccls;
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struct
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{
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struct
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{
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const ase_char_t* ptr;
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const ase_char_t* end;
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} str;
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} match;
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struct
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{
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ase_size_t max;
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ase_size_t cur;
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} depth;
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int ignorecase;
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int errnum;
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};
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struct match_t
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{
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const ase_char_t* match_ptr;
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ase_bool_t matched;
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ase_size_t match_len;
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const ase_byte_t* branch;
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const ase_byte_t* branch_end;
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};
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#include <ase/cmn/pack.h>
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ASE_BEGIN_PACKED_STRUCT (code_t)
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/*ase_byte_t cmd;*/
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short cmd;
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short negate; /* only for CMD_CHARSET */
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ase_size_t lbound;
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ase_size_t ubound;
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ASE_END_PACKED_STRUCT ()
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/* compiled regular expression header */
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ASE_BEGIN_PACKED_STRUCT (rhdr_t)
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ase_size_t nb; /* number of branches */
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ase_size_t el; /* expression length in bytes */
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ASE_END_PACKED_STRUCT ()
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/* branch header */
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ASE_BEGIN_PACKED_STRUCT (bhdr_t)
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ase_size_t na; /* number of atoms */
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ase_size_t bl; /* branch length in bytes */
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ASE_END_PACKED_STRUCT ()
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/* character set header */
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ASE_BEGIN_PACKED_STRUCT (cshdr_t)
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ase_size_t csc; /* count */
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ase_size_t csl; /* length */
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ASE_END_PACKED_STRUCT ()
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#include <ase/cmn/unpack.h>
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typedef const ase_byte_t* (*atom_matcher_t) (
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matcher_t* matcher, const ase_byte_t* base, match_t* mat);
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#define NCHARS_REMAINING(rex) ((rex)->ptn.end - (rex)->ptn.curp)
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#define NEXT_CHAR(rex,level) \
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do { if (next_char(rex,level) == -1) return -1; } while (0)
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#define ADD_CODE(rex,data,len) \
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do { if (add_code(rex,data,len) == -1) return -1; } while (0)
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static int build_pattern (builder_t* rex);
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static int build_pattern0 (builder_t* rex);
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static int build_branch (builder_t* rex);
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static int build_atom (builder_t* rex);
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static int build_charset (builder_t* rex, code_t* cmd);
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static int build_occurrences (builder_t* rex, code_t* cmd);
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static int build_cclass (builder_t* rex, ase_char_t* cc);
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static int build_range (builder_t* rex, code_t* cmd);
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static int next_char (builder_t* rex, int level);
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static int add_code (builder_t* rex, void* data, ase_size_t len);
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static ase_bool_t __begin_with (
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const ase_char_t* str, ase_size_t len, const ase_char_t* what);
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static const ase_byte_t* match_pattern (
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matcher_t* matcher, const ase_byte_t* base, match_t* mat);
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static const ase_byte_t* match_branch (
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matcher_t* matcher, const ase_byte_t* base, match_t* mat);
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static const ase_byte_t* match_branch_body (
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matcher_t* matcher, const ase_byte_t* base, match_t* mat);
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static const ase_byte_t* match_branch_body0 (
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matcher_t* matcher, const ase_byte_t* base, match_t* mat);
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static const ase_byte_t* match_atom (
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matcher_t* matcher, const ase_byte_t* base, match_t* mat);
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static const ase_byte_t* match_bol (
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matcher_t* matcher, const ase_byte_t* base, match_t* mat);
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static const ase_byte_t* match_eol (
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matcher_t* matcher, const ase_byte_t* base, match_t* mat);
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static const ase_byte_t* match_any_char (
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matcher_t* matcher, const ase_byte_t* base, match_t* mat);
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static const ase_byte_t* match_ord_char (
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matcher_t* matcher, const ase_byte_t* base, match_t* mat);
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static const ase_byte_t* match_charset (
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matcher_t* matcher, const ase_byte_t* base, match_t* mat);
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static const ase_byte_t* match_group (
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matcher_t* matcher, const ase_byte_t* base, match_t* mat);
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static const ase_byte_t* match_occurrences (
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matcher_t* matcher, ase_size_t si, const ase_byte_t* p,
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ase_size_t lbound, ase_size_t ubound, match_t* mat);
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static ase_bool_t __test_charset (
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matcher_t* matcher, const ase_byte_t* p, ase_size_t csc, ase_char_t c);
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static ase_bool_t cc_isalnum (ase_ccls_t* ccls, ase_char_t c);
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static ase_bool_t cc_isalpha (ase_ccls_t* ccls, ase_char_t c);
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static ase_bool_t cc_isblank (ase_ccls_t* ccls, ase_char_t c);
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static ase_bool_t cc_iscntrl (ase_ccls_t* ccls, ase_char_t c);
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static ase_bool_t cc_isdigit (ase_ccls_t* ccls, ase_char_t c);
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static ase_bool_t cc_isgraph (ase_ccls_t* ccls, ase_char_t c);
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static ase_bool_t cc_islower (ase_ccls_t* ccls, ase_char_t c);
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static ase_bool_t cc_isprint (ase_ccls_t* ccls, ase_char_t c);
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static ase_bool_t cc_ispunct (ase_ccls_t* ccls, ase_char_t c);
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static ase_bool_t cc_isspace (ase_ccls_t* ccls, ase_char_t c);
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static ase_bool_t cc_isupper (ase_ccls_t* ccls, ase_char_t c);
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static ase_bool_t cc_isxdigit (ase_ccls_t* ccls, ase_char_t c);
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#if 0
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XXX
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static const ase_byte_t* __print_pattern (ase_awk_t* awk, const ase_byte_t* p);
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static const ase_byte_t* __print_branch (ase_awk_t* awk, const ase_byte_t* p);
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static const ase_byte_t* __print_atom (ase_awk_t* awk, const ase_byte_t* p);
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#endif
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struct __char_class_t
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{
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const ase_char_t* name;
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ase_size_t name_len;
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ase_bool_t (*func) (ase_ccls_t* ccls, ase_char_t c);
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};
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static struct __char_class_t __char_class[] =
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{
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{ ASE_T("alnum"), 5, cc_isalnum },
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{ ASE_T("alpha"), 5, cc_isalpha },
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{ ASE_T("blank"), 5, cc_isblank },
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{ ASE_T("cntrl"), 5, cc_iscntrl },
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{ ASE_T("digit"), 5, cc_isdigit },
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{ ASE_T("graph"), 5, cc_isgraph },
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{ ASE_T("lower"), 5, cc_islower },
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{ ASE_T("print"), 5, cc_isprint },
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{ ASE_T("punct"), 5, cc_ispunct },
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{ ASE_T("space"), 5, cc_isspace },
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{ ASE_T("upper"), 5, cc_isupper },
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{ ASE_T("xdigit"), 6, cc_isxdigit },
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/*
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{ ASE_T("arabic"), 6, cc_isarabic },
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{ ASE_T("chinese"), 7, cc_ischinese },
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{ ASE_T("english"), 7, cc_isenglish },
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{ ASE_T("japanese"), 8, cc_isjapanese },
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{ ASE_T("korean"), 6, cc_iskorean },
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{ ASE_T("thai"), 4, cc_isthai },
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*/
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{ ASE_NULL, 0, ASE_NULL }
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};
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void* ase_buildrex (
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ase_mmgr_t* mmgr, ase_size_t depth,
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const ase_char_t* ptn, ase_size_t len, int* errnum)
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{
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builder_t builder;
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builder.mmgr = mmgr;
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builder.code.capa = DEF_CODE_CAPA;
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builder.code.size = 0;
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builder.code.buf = (ase_byte_t*)
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ASE_MALLOC (builder.mmgr, builder.code.capa);
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if (builder.code.buf == ASE_NULL)
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{
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*errnum = ASE_REX_ENOMEM;
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return ASE_NULL;
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}
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builder.ptn.ptr = ptn;
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builder.ptn.end = builder.ptn.ptr + len;
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builder.ptn.curp = builder.ptn.ptr;
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builder.ptn.curc.type = CT_EOF;
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builder.ptn.curc.value = ASE_T('\0');
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builder.ptn.curc.escaped = ase_false;
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builder.depth.max = depth;
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builder.depth.cur = 0;
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if (next_char (&builder, LEVEL_TOP) == -1)
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{
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if (errnum != ASE_NULL) *errnum = builder.errnum;
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ASE_FREE (builder.mmgr, builder.code.buf);
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return ASE_NULL;
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}
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if (build_pattern (&builder) == -1)
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{
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if (errnum != ASE_NULL) *errnum = builder.errnum;
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ASE_FREE (builder.mmgr, builder.code.buf);
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return ASE_NULL;
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}
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if (builder.ptn.curc.type != CT_EOF)
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{
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if (errnum != ASE_NULL)
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{
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if (builder.ptn.curc.type == CT_SPECIAL &&
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builder.ptn.curc.value == ASE_T(')'))
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{
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*errnum = ASE_REX_EUNBALPAR;
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}
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else
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{
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*errnum = ASE_REX_EGARBAGE;
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}
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}
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ASE_FREE (builder.mmgr, builder.code.buf);
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return ASE_NULL;
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}
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return builder.code.buf;
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}
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int ase_matchrex (
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ase_mmgr_t* mmgr, ase_ccls_t* ccls, ase_size_t depth,
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void* code, int option,
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const ase_char_t* str, ase_size_t len,
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const ase_char_t** match_ptr, ase_size_t* match_len, int* errnum)
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{
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matcher_t matcher;
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match_t mat;
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ase_size_t offset = 0;
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/*const ase_char_t* match_ptr_zero = ASE_NULL;*/
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matcher.mmgr = mmgr;
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matcher.ccls = ccls;
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/* store the source string */
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matcher.match.str.ptr = str;
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matcher.match.str.end = str + len;
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matcher.depth.max = depth;
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matcher.depth.cur = 0;
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matcher.ignorecase = (option & ASE_REX_IGNORECASE)? 1: 0;
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mat.matched = ase_false;
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/* TODO: should it allow an offset here??? */
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mat.match_ptr = str + offset;
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/*while (mat.match_ptr < matcher.match.str.end)*/
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while (mat.match_ptr <= matcher.match.str.end)
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{
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if (match_pattern (&matcher, code, &mat) == ASE_NULL)
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{
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if (errnum != ASE_NULL) *errnum = matcher.errnum;
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return -1;
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}
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if (mat.matched)
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{
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/*
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if (mat.match_len == 0)
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{
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if (match_ptr_zero == ASE_NULL)
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match_ptr_zero = mat.match_ptr;
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mat.match_ptr++;
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continue;
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}
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*/
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if (match_ptr != ASE_NULL) *match_ptr = mat.match_ptr;
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if (match_len != ASE_NULL) *match_len = mat.match_len;
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/*match_ptr_zero = ASE_NULL;*/
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break;
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}
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mat.match_ptr++;
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}
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/*
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if (match_ptr_zero != ASE_NULL)
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{
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if (match_ptr != ASE_NULL) *match_ptr = match_ptr_zero;
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if (match_len != ASE_NULL) *match_len = 0;
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return 1;
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}
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*/
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return (mat.matched)? 1: 0;
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}
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void ase_freerex (ase_mmgr_t* mmgr, void* code)
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{
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ASE_ASSERT (code != ASE_NULL);
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ASE_FREE (mmgr, code);
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}
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ase_bool_t ase_isemptyrex (void* code)
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{
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rhdr_t* rhdr = (rhdr_t*) code;
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ASE_ASSERT (rhdr != ASE_NULL);
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/* an empty regular expression look like:
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* | expression |
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* | header | branch |
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* | | branch header |
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* | NB(1) | EL(16) | NA(1) | BL(8) | */
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return (rhdr->nb == 1 &&
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rhdr->el == ASE_SIZEOF(ase_size_t)*4)? ase_true: ase_false;
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}
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static int build_pattern (builder_t* builder)
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{
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int n;
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if (builder->depth.max > 0 && builder->depth.cur >= builder->depth.max)
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{
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builder->errnum = ASE_REX_ERECUR;
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return -1;
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}
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builder->depth.cur++;
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n = build_pattern0 (builder);
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builder->depth.cur--;
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return n;
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}
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static int build_pattern0 (builder_t* builder)
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{
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ase_size_t zero = 0;
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ase_size_t old_size;
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ase_size_t pos_nb;
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rhdr_t* rhdr;
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int n;
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old_size = builder->code.size;
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/* secure space for header and set the header fields to zero */
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pos_nb = builder->code.size;
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ADD_CODE (builder, &zero, ASE_SIZEOF(zero));
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ADD_CODE (builder, &zero, ASE_SIZEOF(zero));
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/* handle the first branch */
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n = build_branch (builder);
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if (n == -1) return -1;
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if (n == 0)
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{
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/* if the pattern is empty, the control reaches here */
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return 0;
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}
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rhdr = (rhdr_t*)&builder->code.buf[pos_nb];
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rhdr->nb++;
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/* handle subsequent branches if any */
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while (builder->ptn.curc.type == CT_SPECIAL &&
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builder->ptn.curc.value == ASE_T('|'))
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{
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NEXT_CHAR (builder, LEVEL_TOP);
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n = build_branch(builder);
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if (n == -1) return -1;
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if (n == 0)
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{
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/* if the pattern ends with a vertical bar(|),
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* this block can be reached. however, such a
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* pattern is highly discouraged */
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break;
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}
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rhdr = (rhdr_t*)&builder->code.buf[pos_nb];
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rhdr->nb++;
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}
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rhdr = (rhdr_t*)&builder->code.buf[pos_nb];
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rhdr->el = builder->code.size - old_size;
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return 1;
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}
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static int build_branch (builder_t* builder)
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{
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int n;
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ase_size_t zero = 0;
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ase_size_t old_size;
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ase_size_t pos_na;
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code_t* cmd;
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bhdr_t* bhdr;
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old_size = builder->code.size;
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pos_na = builder->code.size;
|
|
ADD_CODE (builder, &zero, ASE_SIZEOF(zero));
|
|
ADD_CODE (builder, &zero, ASE_SIZEOF(zero));
|
|
|
|
while (1)
|
|
{
|
|
cmd = (code_t*)&builder->code.buf[builder->code.size];
|
|
|
|
n = build_atom (builder);
|
|
if (n == -1)
|
|
{
|
|
builder->code.size = old_size;
|
|
return -1;
|
|
}
|
|
|
|
if (n == 0) break; /* no atom */
|
|
|
|
n = build_occurrences (builder, cmd);
|
|
if (n == -1)
|
|
{
|
|
builder->code.size = old_size;
|
|
return -1;
|
|
}
|
|
|
|
/* n == 0 no bound character. just continue */
|
|
/* n == 1 bound has been applied by build_occurrences */
|
|
|
|
bhdr = (bhdr_t*)&builder->code.buf[pos_na];
|
|
bhdr->na++;
|
|
}
|
|
|
|
bhdr = (bhdr_t*)&builder->code.buf[pos_na];
|
|
bhdr->bl = builder->code.size - old_size;
|
|
|
|
return (builder->code.size == old_size)? 0: 1;
|
|
}
|
|
|
|
static int build_atom (builder_t* builder)
|
|
{
|
|
int n;
|
|
code_t tmp;
|
|
|
|
if (builder->ptn.curc.type == CT_EOF) return 0;
|
|
|
|
if (builder->ptn.curc.type == CT_SPECIAL)
|
|
{
|
|
if (builder->ptn.curc.value == ASE_T('('))
|
|
{
|
|
tmp.cmd = CMD_GROUP;
|
|
tmp.negate = 0;
|
|
tmp.lbound = 1;
|
|
tmp.ubound = 1;
|
|
ADD_CODE (builder, &tmp, ASE_SIZEOF(tmp));
|
|
|
|
NEXT_CHAR (builder, LEVEL_TOP);
|
|
|
|
n = build_pattern (builder);
|
|
if (n == -1) return -1;
|
|
|
|
if (builder->ptn.curc.type != CT_SPECIAL ||
|
|
builder->ptn.curc.value != ASE_T(')'))
|
|
{
|
|
builder->errnum = ASE_REX_ERPAREN;
|
|
return -1;
|
|
}
|
|
}
|
|
else if (builder->ptn.curc.value == ASE_T('^'))
|
|
{
|
|
tmp.cmd = CMD_BOL;
|
|
tmp.negate = 0;
|
|
tmp.lbound = 1;
|
|
tmp.ubound = 1;
|
|
ADD_CODE (builder, &tmp, ASE_SIZEOF(tmp));
|
|
}
|
|
else if (builder->ptn.curc.value == ASE_T('$'))
|
|
{
|
|
tmp.cmd = CMD_EOL;
|
|
tmp.negate = 0;
|
|
tmp.lbound = 1;
|
|
tmp.ubound = 1;
|
|
ADD_CODE (builder, &tmp, ASE_SIZEOF(tmp));
|
|
}
|
|
else if (builder->ptn.curc.value == ASE_T('.'))
|
|
{
|
|
tmp.cmd = CMD_ANY_CHAR;
|
|
tmp.negate = 0;
|
|
tmp.lbound = 1;
|
|
tmp.ubound = 1;
|
|
ADD_CODE (builder, &tmp, ASE_SIZEOF(tmp));
|
|
}
|
|
else if (builder->ptn.curc.value == ASE_T('['))
|
|
{
|
|
code_t* cmd;
|
|
|
|
cmd = (code_t*)&builder->code.buf[builder->code.size];
|
|
|
|
tmp.cmd = CMD_CHARSET;
|
|
tmp.negate = 0;
|
|
tmp.lbound = 1;
|
|
tmp.ubound = 1;
|
|
ADD_CODE (builder, &tmp, ASE_SIZEOF(tmp));
|
|
|
|
NEXT_CHAR (builder, LEVEL_CHARSET);
|
|
|
|
n = build_charset (builder, cmd);
|
|
if (n == -1) return -1;
|
|
|
|
ASE_ASSERT (n != 0);
|
|
|
|
if (builder->ptn.curc.type != CT_SPECIAL ||
|
|
builder->ptn.curc.value != ASE_T(']'))
|
|
{
|
|
builder->errnum = ASE_REX_ERBRACKET;
|
|
return -1;
|
|
}
|
|
|
|
}
|
|
else return 0;
|
|
|
|
NEXT_CHAR (builder, LEVEL_TOP);
|
|
return 1;
|
|
}
|
|
else
|
|
{
|
|
ASE_ASSERT (builder->ptn.curc.type == CT_NORMAL);
|
|
|
|
tmp.cmd = CMD_ORD_CHAR;
|
|
tmp.negate = 0;
|
|
tmp.lbound = 1;
|
|
tmp.ubound = 1;
|
|
ADD_CODE (builder, &tmp, ASE_SIZEOF(tmp));
|
|
|
|
ADD_CODE (builder,
|
|
&builder->ptn.curc.value,
|
|
ASE_SIZEOF(builder->ptn.curc.value));
|
|
NEXT_CHAR (builder, LEVEL_TOP);
|
|
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
static int build_charset (builder_t* builder, code_t* cmd)
|
|
{
|
|
ase_size_t zero = 0;
|
|
ase_size_t old_size;
|
|
ase_size_t pos_csc;
|
|
cshdr_t* cshdr;
|
|
|
|
old_size = builder->code.size;
|
|
|
|
pos_csc = builder->code.size;
|
|
ADD_CODE (builder, &zero, ASE_SIZEOF(zero));
|
|
ADD_CODE (builder, &zero, ASE_SIZEOF(zero));
|
|
|
|
if (builder->ptn.curc.type == CT_NORMAL &&
|
|
builder->ptn.curc.value == ASE_T('^'))
|
|
{
|
|
cmd->negate = 1;
|
|
NEXT_CHAR (builder, LEVEL_CHARSET);
|
|
}
|
|
|
|
while (builder->ptn.curc.type == CT_NORMAL)
|
|
{
|
|
ase_char_t c0, c1, c2;
|
|
int cc = 0;
|
|
|
|
c1 = builder->ptn.curc.value;
|
|
NEXT_CHAR(builder, LEVEL_CHARSET);
|
|
|
|
if (c1 == ASE_T('[') &&
|
|
builder->ptn.curc.type == CT_NORMAL &&
|
|
builder->ptn.curc.value == ASE_T(':'))
|
|
{
|
|
if (build_cclass (builder, &c1) == -1) return -1;
|
|
cc = cc | 1;
|
|
}
|
|
|
|
c2 = c1;
|
|
if (builder->ptn.curc.type == CT_NORMAL &&
|
|
builder->ptn.curc.value == ASE_T('-') &&
|
|
builder->ptn.curc.escaped == ase_false)
|
|
{
|
|
NEXT_CHAR (builder, LEVEL_CHARSET);
|
|
|
|
if (builder->ptn.curc.type == CT_NORMAL)
|
|
{
|
|
c2 = builder->ptn.curc.value;
|
|
NEXT_CHAR (builder, LEVEL_CHARSET);
|
|
|
|
if (c2 == ASE_T('[') &&
|
|
builder->ptn.curc.type == CT_NORMAL &&
|
|
builder->ptn.curc.value == ASE_T(':'))
|
|
{
|
|
if (build_cclass (builder, &c2) == -1)
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
cc = cc | 2;
|
|
}
|
|
}
|
|
else cc = cc | 4;
|
|
}
|
|
|
|
|
|
if (cc == 0 || cc == 4)
|
|
{
|
|
if (c1 == c2)
|
|
{
|
|
c0 = CHARSET_ONE;
|
|
ADD_CODE (builder, &c0, ASE_SIZEOF(c0));
|
|
ADD_CODE (builder, &c1, ASE_SIZEOF(c1));
|
|
}
|
|
else
|
|
{
|
|
c0 = CHARSET_RANGE;
|
|
ADD_CODE (builder, &c0, ASE_SIZEOF(c0));
|
|
ADD_CODE (builder, &c1, ASE_SIZEOF(c1));
|
|
ADD_CODE (builder, &c2, ASE_SIZEOF(c2));
|
|
}
|
|
}
|
|
else if (cc == 1)
|
|
{
|
|
c0 = CHARSET_CLASS;
|
|
ADD_CODE (builder, &c0, ASE_SIZEOF(c0));
|
|
ADD_CODE (builder, &c1, ASE_SIZEOF(c1));
|
|
}
|
|
else
|
|
{
|
|
/* invalid range */
|
|
#ifdef DEBUG_REX
|
|
ase_dprintf (
|
|
ASE_T("build_charset: invalid character set range\n"));
|
|
#endif
|
|
builder->errnum = ASE_REX_ECRANGE;
|
|
return -1;
|
|
}
|
|
|
|
cshdr = (cshdr_t*)&builder->code.buf[pos_csc];
|
|
cshdr->csc++;
|
|
}
|
|
|
|
cshdr = (cshdr_t*)&builder->code.buf[pos_csc];
|
|
cshdr->csl = builder->code.size - old_size;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int build_cclass (builder_t* builder, ase_char_t* cc)
|
|
{
|
|
const struct __char_class_t* ccp = __char_class;
|
|
ase_size_t len = builder->ptn.end - builder->ptn.curp;
|
|
|
|
while (ccp->name != ASE_NULL)
|
|
{
|
|
if (__begin_with (builder->ptn.curp, len, ccp->name)) break;
|
|
ccp++;
|
|
}
|
|
|
|
if (ccp->name == ASE_NULL)
|
|
{
|
|
/* wrong class name */
|
|
#ifdef DEBUG_REX
|
|
ase_dprintf (ASE_T("build_cclass: wrong class name\n"));
|
|
#endif
|
|
builder->errnum = ASE_REX_ECCLASS;
|
|
return -1;
|
|
}
|
|
|
|
builder->ptn.curp += ccp->name_len;
|
|
|
|
NEXT_CHAR (builder, LEVEL_CHARSET);
|
|
if (builder->ptn.curc.type != CT_NORMAL ||
|
|
builder->ptn.curc.value != ASE_T(':'))
|
|
{
|
|
#ifdef DEBUG_REX
|
|
ase_dprintf (ASE_T("build_cclass: a colon(:) expected\n"));
|
|
#endif
|
|
builder->errnum = ASE_REX_ECOLON;
|
|
return -1;
|
|
}
|
|
|
|
NEXT_CHAR (builder, LEVEL_CHARSET);
|
|
|
|
/* ] happens to be the charset ender ] */
|
|
if (builder->ptn.curc.type != CT_SPECIAL ||
|
|
builder->ptn.curc.value != ASE_T(']'))
|
|
{
|
|
#ifdef DEBUG_REX
|
|
ase_dprintf (ASE_T("build_cclass: ] expected\n"));
|
|
#endif
|
|
builder->errnum = ASE_REX_ERBRACKET;
|
|
return -1;
|
|
}
|
|
|
|
NEXT_CHAR (builder, LEVEL_CHARSET);
|
|
|
|
*cc = (ase_char_t)(ccp - __char_class);
|
|
return 1;
|
|
}
|
|
|
|
static int build_occurrences (builder_t* builder, code_t* cmd)
|
|
{
|
|
if (builder->ptn.curc.type != CT_SPECIAL) return 0;
|
|
|
|
switch (builder->ptn.curc.value)
|
|
{
|
|
case ASE_T('+'):
|
|
{
|
|
cmd->lbound = 1;
|
|
cmd->ubound = BOUND_MAX;
|
|
NEXT_CHAR(builder, LEVEL_TOP);
|
|
return 1;
|
|
}
|
|
|
|
case ASE_T('*'):
|
|
{
|
|
cmd->lbound = 0;
|
|
cmd->ubound = BOUND_MAX;
|
|
NEXT_CHAR(builder, LEVEL_TOP);
|
|
return 1;
|
|
}
|
|
|
|
case ASE_T('?'):
|
|
{
|
|
cmd->lbound = 0;
|
|
cmd->ubound = 1;
|
|
NEXT_CHAR(builder, LEVEL_TOP);
|
|
return 1;
|
|
}
|
|
|
|
case ASE_T('{'):
|
|
{
|
|
NEXT_CHAR (builder, LEVEL_RANGE);
|
|
|
|
if (build_range(builder, cmd) == -1) return -1;
|
|
|
|
if (builder->ptn.curc.type != CT_SPECIAL ||
|
|
builder->ptn.curc.value != ASE_T('}'))
|
|
{
|
|
builder->errnum = ASE_REX_ERBRACE;
|
|
return -1;
|
|
}
|
|
|
|
NEXT_CHAR (builder, LEVEL_TOP);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int build_range (builder_t* builder, code_t* cmd)
|
|
{
|
|
ase_size_t bound;
|
|
|
|
/* TODO: should allow white spaces in the range???
|
|
what if it is not in the raight format? convert it to ordinary characters?? */
|
|
bound = 0;
|
|
while (builder->ptn.curc.type == CT_NORMAL &&
|
|
(builder->ptn.curc.value >= ASE_T('0') &&
|
|
builder->ptn.curc.value <= ASE_T('9')))
|
|
{
|
|
bound = bound * 10 + builder->ptn.curc.value - ASE_T('0');
|
|
NEXT_CHAR (builder, LEVEL_RANGE);
|
|
}
|
|
|
|
cmd->lbound = bound;
|
|
|
|
if (builder->ptn.curc.type == CT_SPECIAL &&
|
|
builder->ptn.curc.value == ASE_T(','))
|
|
{
|
|
NEXT_CHAR (builder, LEVEL_RANGE);
|
|
|
|
bound = 0;
|
|
while (builder->ptn.curc.type == CT_NORMAL &&
|
|
(builder->ptn.curc.value >= ASE_T('0') &&
|
|
builder->ptn.curc.value <= ASE_T('9')))
|
|
{
|
|
bound = bound * 10 + builder->ptn.curc.value - ASE_T('0');
|
|
NEXT_CHAR (builder, LEVEL_RANGE);
|
|
}
|
|
|
|
cmd->ubound = bound;
|
|
}
|
|
else cmd->ubound = BOUND_MAX;
|
|
|
|
if (cmd->lbound > cmd->ubound)
|
|
{
|
|
/* invalid occurrences range */
|
|
builder->errnum = ASE_REX_EBRANGE;
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#define CHECK_END(builder) \
|
|
do { \
|
|
if (builder->ptn.curp >= builder->ptn.end) \
|
|
{ \
|
|
builder->errnum = ASE_REX_EEND; \
|
|
return -1; \
|
|
} \
|
|
} while(0)
|
|
|
|
#define IS_HEX(c) \
|
|
((c >= ASE_T('0') && c <= ASE_T('9')) || \
|
|
(c >= ASE_T('A') && c <= ASE_T('F')) || \
|
|
(c >= ASE_T('a') && c <= ASE_T('f')))
|
|
|
|
#define HEX_TO_NUM(c) \
|
|
((c >= ASE_T('0') && c <= ASE_T('9'))? c-ASE_T('0'): \
|
|
(c >= ASE_T('A') && c <= ASE_T('F'))? c-ASE_T('A')+10: \
|
|
c-ASE_T('a')+10)
|
|
|
|
static int next_char (builder_t* builder, int level)
|
|
{
|
|
if (builder->ptn.curp >= builder->ptn.end)
|
|
{
|
|
builder->ptn.curc.type = CT_EOF;
|
|
builder->ptn.curc.value = ASE_T('\0');
|
|
builder->ptn.curc.escaped = ase_false;
|
|
return 0;
|
|
}
|
|
|
|
builder->ptn.curc.type = CT_NORMAL;
|
|
builder->ptn.curc.value = *builder->ptn.curp++;
|
|
builder->ptn.curc.escaped = ase_false;
|
|
|
|
if (builder->ptn.curc.value == ASE_T('\\'))
|
|
{
|
|
ase_char_t c;
|
|
|
|
CHECK_END (builder);
|
|
c = *builder->ptn.curp++;
|
|
|
|
if (c == ASE_T('n')) c = ASE_T('\n');
|
|
else if (c == ASE_T('r')) c = ASE_T('\r');
|
|
else if (c == ASE_T('t')) c = ASE_T('\t');
|
|
else if (c == ASE_T('f')) c = ASE_T('\f');
|
|
else if (c == ASE_T('b')) c = ASE_T('\b');
|
|
else if (c == ASE_T('v')) c = ASE_T('\v');
|
|
else if (c == ASE_T('a')) c = ASE_T('\a');
|
|
else if (c >= ASE_T('0') && c <= ASE_T('7'))
|
|
{
|
|
ase_char_t cx;
|
|
|
|
c = c - ASE_T('0');
|
|
|
|
CHECK_END (builder);
|
|
cx = *builder->ptn.curp++;
|
|
if (cx >= ASE_T('0') && cx <= ASE_T('7'))
|
|
{
|
|
c = c * 8 + cx - ASE_T('0');
|
|
|
|
CHECK_END (builder);
|
|
cx = *builder->ptn.curp++;
|
|
if (cx >= ASE_T('0') && cx <= ASE_T('7'))
|
|
{
|
|
c = c * 8 + cx - ASE_T('0');
|
|
}
|
|
}
|
|
}
|
|
else if (c == ASE_T('x'))
|
|
{
|
|
ase_char_t cx;
|
|
|
|
CHECK_END (builder);
|
|
cx = *builder->ptn.curp++;
|
|
if (IS_HEX(cx))
|
|
{
|
|
c = HEX_TO_NUM(cx);
|
|
|
|
CHECK_END (builder);
|
|
cx = *builder->ptn.curp++;
|
|
if (IS_HEX(cx))
|
|
{
|
|
c = c * 16 + HEX_TO_NUM(cx);
|
|
}
|
|
}
|
|
}
|
|
#ifdef ASE_CHAR_IS_WCHAR
|
|
else if (c == ASE_T('u') && ASE_SIZEOF(ase_char_t) >= 2)
|
|
{
|
|
ase_char_t cx;
|
|
|
|
CHECK_END (builder);
|
|
cx = *builder->ptn.curp++;
|
|
if (IS_HEX(cx))
|
|
{
|
|
ase_size_t i;
|
|
|
|
c = HEX_TO_NUM(cx);
|
|
|
|
for (i = 0; i < 3; i++)
|
|
{
|
|
CHECK_END (builder);
|
|
cx = *builder->ptn.curp++;
|
|
|
|
if (!IS_HEX(cx)) break;
|
|
c = c * 16 + HEX_TO_NUM(cx);
|
|
}
|
|
}
|
|
}
|
|
else if (c == ASE_T('U') && ASE_SIZEOF(ase_char_t) >= 4)
|
|
{
|
|
ase_char_t cx;
|
|
|
|
CHECK_END (builder);
|
|
cx = *builder->ptn.curp++;
|
|
if (IS_HEX(cx))
|
|
{
|
|
ase_size_t i;
|
|
|
|
c = HEX_TO_NUM(cx);
|
|
|
|
for (i = 0; i < 7; i++)
|
|
{
|
|
CHECK_END (builder);
|
|
cx = *builder->ptn.curp++;
|
|
|
|
if (!IS_HEX(cx)) break;
|
|
c = c * 16 + HEX_TO_NUM(cx);
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
builder->ptn.curc.value = c;
|
|
builder->ptn.curc.escaped = ase_true;
|
|
|
|
return 0;
|
|
}
|
|
else
|
|
{
|
|
if (level == LEVEL_TOP)
|
|
{
|
|
if (builder->ptn.curc.value == ASE_T('[') ||
|
|
builder->ptn.curc.value == ASE_T('|') ||
|
|
builder->ptn.curc.value == ASE_T('^') ||
|
|
builder->ptn.curc.value == ASE_T('$') ||
|
|
builder->ptn.curc.value == ASE_T('{') ||
|
|
builder->ptn.curc.value == ASE_T('+') ||
|
|
builder->ptn.curc.value == ASE_T('?') ||
|
|
builder->ptn.curc.value == ASE_T('*') ||
|
|
builder->ptn.curc.value == ASE_T('.') ||
|
|
builder->ptn.curc.value == ASE_T('(') ||
|
|
builder->ptn.curc.value == ASE_T(')'))
|
|
{
|
|
builder->ptn.curc.type = CT_SPECIAL;
|
|
}
|
|
}
|
|
else if (level == LEVEL_CHARSET)
|
|
{
|
|
if (builder->ptn.curc.value == ASE_T(']'))
|
|
{
|
|
builder->ptn.curc.type = CT_SPECIAL;
|
|
}
|
|
}
|
|
else if (level == LEVEL_RANGE)
|
|
{
|
|
if (builder->ptn.curc.value == ASE_T(',') ||
|
|
builder->ptn.curc.value == ASE_T('}'))
|
|
{
|
|
builder->ptn.curc.type = CT_SPECIAL;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int add_code (builder_t* builder, void* data, ase_size_t len)
|
|
{
|
|
if (len > builder->code.capa - builder->code.size)
|
|
{
|
|
ase_size_t capa = builder->code.capa * 2;
|
|
ase_byte_t* tmp;
|
|
|
|
if (capa == 0) capa = DEF_CODE_CAPA;
|
|
while (len > capa - builder->code.size) { capa = capa * 2; }
|
|
|
|
if (builder->mmgr->realloc != ASE_NULL)
|
|
{
|
|
tmp = (ase_byte_t*) ASE_REALLOC (
|
|
builder->mmgr, builder->code.buf, capa);
|
|
if (tmp == ASE_NULL)
|
|
{
|
|
builder->errnum = ASE_REX_ENOMEM;
|
|
return -1;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
tmp = (ase_byte_t*) ASE_MALLOC (builder->mmgr, capa);
|
|
if (tmp == ASE_NULL)
|
|
{
|
|
builder->errnum = ASE_REX_ENOMEM;
|
|
return -1;
|
|
}
|
|
|
|
if (builder->code.buf != ASE_NULL)
|
|
{
|
|
ase_memcpy (tmp, builder->code.buf, builder->code.capa);
|
|
ASE_FREE (builder->mmgr, builder->code.buf);
|
|
}
|
|
}
|
|
|
|
builder->code.buf = tmp;
|
|
builder->code.capa = capa;
|
|
}
|
|
|
|
ase_memcpy (&builder->code.buf[builder->code.size], data, len);
|
|
builder->code.size += len;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static ase_bool_t __begin_with (
|
|
const ase_char_t* str, ase_size_t len, const ase_char_t* what)
|
|
{
|
|
const ase_char_t* end = str + len;
|
|
|
|
while (str < end)
|
|
{
|
|
if (*what == ASE_T('\0')) return ase_true;
|
|
if (*what != *str) return ase_false;
|
|
|
|
str++; what++;
|
|
}
|
|
|
|
if (*what == ASE_T('\0')) return ase_true;
|
|
return ase_false;
|
|
}
|
|
|
|
static const ase_byte_t* match_pattern (
|
|
matcher_t* matcher, const ase_byte_t* base, match_t* mat)
|
|
{
|
|
match_t mat2;
|
|
ase_size_t i;
|
|
const ase_byte_t* p;
|
|
rhdr_t* rhdr;
|
|
|
|
p = base;
|
|
rhdr = (rhdr_t*) p; p += ASE_SIZEOF(*rhdr);
|
|
|
|
#ifdef DEBUG_REX
|
|
ase_dprintf (
|
|
ASE_T("match_pattern: NB = %u, EL = %u\n"),
|
|
(unsigned int)rhdr->nb, (unsigned int)rhdr->el);
|
|
#endif
|
|
|
|
mat->matched = ase_false;
|
|
mat->match_len = 0;
|
|
|
|
for (i = 0; i < rhdr->nb; i++)
|
|
{
|
|
mat2.match_ptr = mat->match_ptr;
|
|
|
|
p = match_branch (matcher, p, &mat2);
|
|
if (p == ASE_NULL) return ASE_NULL;
|
|
|
|
if (mat2.matched)
|
|
{
|
|
mat->matched = ase_true;
|
|
mat->match_len = mat2.match_len;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return base + rhdr->el;
|
|
}
|
|
|
|
static const ase_byte_t* match_branch (
|
|
matcher_t* matcher, const ase_byte_t* base, match_t* mat)
|
|
{
|
|
/* branch body base+sizeof(NA)+sizeof(BL)-----+
|
|
* BL base+sizeof(NA) ----------+ |
|
|
* base NA ------+ | |
|
|
* | | |
|
|
* |NA(ase_size_t)|BL(ase_size_t)|ATOMS.........|
|
|
*/
|
|
mat->branch = base;
|
|
mat->branch_end = base + ((bhdr_t*)base)->bl;
|
|
|
|
return match_branch_body (
|
|
matcher, (const ase_byte_t*)((bhdr_t*)base+1), mat);
|
|
}
|
|
|
|
static const ase_byte_t* match_branch_body (
|
|
matcher_t* matcher, const ase_byte_t* base, match_t* mat)
|
|
{
|
|
const ase_byte_t* n;
|
|
|
|
if (matcher->depth.max > 0 && matcher->depth.cur >= matcher->depth.max)
|
|
{
|
|
matcher->errnum = ASE_REX_ERECUR;
|
|
return ASE_NULL;
|
|
}
|
|
|
|
matcher->depth.cur++;
|
|
n = match_branch_body0 (matcher, base, mat);
|
|
matcher->depth.cur--;
|
|
|
|
return n;
|
|
}
|
|
|
|
static const ase_byte_t* match_branch_body0 (
|
|
matcher_t* matcher, const ase_byte_t* base, match_t* mat)
|
|
{
|
|
const ase_byte_t* p;
|
|
/* match_t mat2;*/
|
|
ase_size_t match_len = 0;
|
|
|
|
mat->matched = ase_false;
|
|
mat->match_len = 0;
|
|
|
|
/* TODO: is mat2 necessary here ? */
|
|
/*
|
|
mat2.match_ptr = mat->match_ptr;
|
|
mat2.branch = mat->branch;
|
|
mat2.branch_end = mat->branch_end;
|
|
*/
|
|
|
|
p = base;
|
|
|
|
while (p < mat->branch_end)
|
|
{
|
|
p = match_atom (matcher, p, mat);
|
|
if (p == ASE_NULL) return ASE_NULL;
|
|
|
|
if (!mat->matched) break;
|
|
|
|
mat->match_ptr = &mat->match_ptr[mat->match_len];
|
|
match_len += mat->match_len;
|
|
#if 0
|
|
p = match_atom (matcher, p, &mat2);
|
|
if (p == ASE_NULL) return ASE_NULL;
|
|
|
|
if (!mat2.matched)
|
|
{
|
|
mat->matched = ase_false;
|
|
break; /* stop matching */
|
|
}
|
|
|
|
mat->matched = ase_true;
|
|
mat->match_len += mat2.match_len;
|
|
|
|
mat2.match_ptr = &mat2.match_ptr[mat2.match_len];
|
|
#endif
|
|
}
|
|
|
|
if (mat->matched) mat->match_len = match_len;
|
|
return mat->branch_end;
|
|
}
|
|
|
|
static const ase_byte_t* match_atom (
|
|
matcher_t* matcher, const ase_byte_t* base, match_t* mat)
|
|
{
|
|
static atom_matcher_t matchers[] =
|
|
{
|
|
match_bol,
|
|
match_eol,
|
|
match_any_char,
|
|
match_ord_char,
|
|
match_charset,
|
|
match_group
|
|
};
|
|
|
|
ASE_ASSERT (
|
|
((code_t*)base)->cmd >= 0 &&
|
|
((code_t*)base)->cmd < ASE_COUNTOF(matchers));
|
|
|
|
return matchers[((code_t*)base)->cmd] (matcher, base, mat);
|
|
}
|
|
|
|
static const ase_byte_t* match_bol (
|
|
matcher_t* matcher, const ase_byte_t* base, match_t* mat)
|
|
{
|
|
const ase_byte_t* p = base;
|
|
const code_t* cp;
|
|
|
|
cp = (const code_t*)p; p += ASE_SIZEOF(*cp);
|
|
ASE_ASSERT (cp->cmd == CMD_BOL);
|
|
|
|
mat->matched = (mat->match_ptr == matcher->match.str.ptr ||
|
|
(cp->lbound == cp->ubound && cp->lbound == 0));
|
|
mat->match_len = 0;
|
|
|
|
return p;
|
|
}
|
|
|
|
static const ase_byte_t* match_eol (
|
|
matcher_t* matcher, const ase_byte_t* base, match_t* mat)
|
|
{
|
|
const ase_byte_t* p = base;
|
|
const code_t* cp;
|
|
|
|
cp = (const code_t*)p; p += ASE_SIZEOF(*cp);
|
|
ASE_ASSERT (cp->cmd == CMD_EOL);
|
|
|
|
mat->matched = (mat->match_ptr == matcher->match.str.end ||
|
|
(cp->lbound == cp->ubound && cp->lbound == 0));
|
|
mat->match_len = 0;
|
|
|
|
return p;
|
|
}
|
|
|
|
static const ase_byte_t* match_any_char (
|
|
matcher_t* matcher, const ase_byte_t* base, match_t* mat)
|
|
{
|
|
const ase_byte_t* p = base;
|
|
const code_t* cp;
|
|
ase_size_t si = 0, lbound, ubound;
|
|
|
|
cp = (const code_t*)p; p += ASE_SIZEOF(*cp);
|
|
ASE_ASSERT (cp->cmd == CMD_ANY_CHAR);
|
|
|
|
lbound = cp->lbound;
|
|
ubound = cp->ubound;
|
|
|
|
mat->matched = ase_false;
|
|
mat->match_len = 0;
|
|
|
|
/* merge the same consecutive codes */
|
|
while (p < mat->branch_end &&
|
|
cp->cmd == ((const code_t*)p)->cmd)
|
|
{
|
|
lbound += ((const code_t*)p)->lbound;
|
|
ubound += ((const code_t*)p)->ubound;
|
|
|
|
p += ASE_SIZEOF(*cp);
|
|
}
|
|
|
|
#ifdef DEBUG_REX
|
|
ase_dprintf (
|
|
ASE_T("match_any_char: lbound = %u, ubound = %u\n"),
|
|
(unsigned int)lbound, (unsigned int)ubound);
|
|
#endif
|
|
|
|
/* find the longest match */
|
|
while (si < ubound)
|
|
{
|
|
if (&mat->match_ptr[si] >= matcher->match.str.end) break;
|
|
si++;
|
|
}
|
|
|
|
#ifdef DEBUG_REX
|
|
ase_dprintf (
|
|
ASE_T("match_any_char: max si = %u\n"), (unsigned)si);
|
|
#endif
|
|
|
|
if (si >= lbound && si <= ubound)
|
|
{
|
|
p = match_occurrences (matcher, si, p, lbound, ubound, mat);
|
|
}
|
|
|
|
return p;
|
|
}
|
|
|
|
static const ase_byte_t* match_ord_char (
|
|
matcher_t* matcher, const ase_byte_t* base, match_t* mat)
|
|
{
|
|
const ase_byte_t* p = base;
|
|
const code_t* cp;
|
|
ase_size_t si = 0, lbound, ubound;
|
|
ase_char_t cc;
|
|
|
|
cp = (const code_t*)p; p += ASE_SIZEOF(*cp);
|
|
ASE_ASSERT (cp->cmd == CMD_ORD_CHAR);
|
|
|
|
lbound = cp->lbound;
|
|
ubound = cp->ubound;
|
|
|
|
cc = *(ase_char_t*)p; p += ASE_SIZEOF(cc);
|
|
if (matcher->ignorecase) cc = ASE_TOUPPER(matcher->ccls, cc);
|
|
|
|
/* merge the same consecutive codes
|
|
* for example, a{1,10}a{0,10} is shortened to a{1,20} */
|
|
if (matcher->ignorecase)
|
|
{
|
|
while (p < mat->branch_end &&
|
|
cp->cmd == ((const code_t*)p)->cmd)
|
|
{
|
|
if (ASE_TOUPPER (matcher->ccls, *(ase_char_t*)(p+ASE_SIZEOF(*cp))) != cc) break;
|
|
|
|
lbound += ((const code_t*)p)->lbound;
|
|
ubound += ((const code_t*)p)->ubound;
|
|
|
|
p += ASE_SIZEOF(*cp) + ASE_SIZEOF(cc);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
while (p < mat->branch_end &&
|
|
cp->cmd == ((const code_t*)p)->cmd)
|
|
{
|
|
if (*(ase_char_t*)(p+ASE_SIZEOF(*cp)) != cc) break;
|
|
|
|
lbound += ((const code_t*)p)->lbound;
|
|
ubound += ((const code_t*)p)->ubound;
|
|
|
|
p += ASE_SIZEOF(*cp) + ASE_SIZEOF(cc);
|
|
}
|
|
}
|
|
|
|
#ifdef DEBUG_REX
|
|
ase_dprintf (
|
|
ASE_T("match_ord_char: cc = %c, lbound = %u, ubound = %u\n"),
|
|
cc, (unsigned int)lbound, (unsigned int)ubound);
|
|
#endif
|
|
|
|
mat->matched = ase_false;
|
|
mat->match_len = 0;
|
|
|
|
/* find the longest match */
|
|
if (matcher->ignorecase)
|
|
{
|
|
while (si < ubound)
|
|
{
|
|
if (&mat->match_ptr[si] >= matcher->match.str.end) break;
|
|
#ifdef DEBUG_REX
|
|
ase_dprintf (
|
|
ASE_T("match_ord_char: <ignorecase> %c %c\n"),
|
|
cc, mat->match_ptr[si]);
|
|
#endif
|
|
if (cc != ASE_TOUPPER (matcher->ccls, mat->match_ptr[si])) break;
|
|
si++;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
while (si < ubound)
|
|
{
|
|
if (&mat->match_ptr[si] >= matcher->match.str.end) break;
|
|
#ifdef DEBUG_REX
|
|
ase_dprintf (
|
|
ASE_T("match_ord_char: %c %c\n"),
|
|
cc, mat->match_ptr[si]);
|
|
#endif
|
|
if (cc != mat->match_ptr[si]) break;
|
|
si++;
|
|
}
|
|
}
|
|
|
|
#ifdef DEBUG_REX
|
|
ase_dprintf (
|
|
ASE_T("match_ord_char: max occurrences=%u, lbound=%u, ubound=%u\n"),
|
|
(unsigned)si, (unsigned)lbound, (unsigned)ubound);
|
|
#endif
|
|
|
|
if (si >= lbound && si <= ubound)
|
|
{
|
|
p = match_occurrences (matcher, si, p, lbound, ubound, mat);
|
|
}
|
|
|
|
return p;
|
|
}
|
|
|
|
static const ase_byte_t* match_charset (
|
|
matcher_t* matcher, const ase_byte_t* base, match_t* mat)
|
|
{
|
|
const ase_byte_t* p = base;
|
|
ase_size_t si = 0;
|
|
ase_bool_t n;
|
|
ase_char_t c;
|
|
|
|
code_t* cp;
|
|
cshdr_t* cshdr;
|
|
|
|
cp = (code_t*)p; p += ASE_SIZEOF(*cp);
|
|
ASE_ASSERT (cp->cmd == CMD_CHARSET);
|
|
|
|
cshdr = (cshdr_t*)p; p += ASE_SIZEOF(*cshdr);
|
|
|
|
#ifdef DEBUG_REX
|
|
ase_dprintf (
|
|
ASE_T("match_charset: lbound = %u, ubound = %u\n"),
|
|
(unsigned int)cp->lbound, (unsigned int)cp->ubound);
|
|
#endif
|
|
|
|
mat->matched = ase_false;
|
|
mat->match_len = 0;
|
|
|
|
while (si < cp->ubound)
|
|
{
|
|
if (&mat->match_ptr[si] >= matcher->match.str.end) break;
|
|
|
|
c = mat->match_ptr[si];
|
|
if (matcher->ignorecase) c = ASE_TOUPPER(matcher->ccls, c);
|
|
|
|
n = __test_charset (matcher, p, cshdr->csc, c);
|
|
if (cp->negate) n = !n;
|
|
if (!n) break;
|
|
|
|
si++;
|
|
}
|
|
|
|
p = p + cshdr->csl - ASE_SIZEOF(*cshdr);
|
|
|
|
#ifdef DEBUG_REX
|
|
ase_dprintf (
|
|
ASE_T("match_charset: max occurrences=%u, lbound=%u, ubound=%u\n"),
|
|
(unsigned)si, (unsigned)cp->lbound, (unsigned)cp->ubound);
|
|
#endif
|
|
|
|
if (si >= cp->lbound && si <= cp->ubound)
|
|
{
|
|
p = match_occurrences (matcher, si, p, cp->lbound, cp->ubound, mat);
|
|
}
|
|
|
|
return p;
|
|
}
|
|
|
|
static const ase_byte_t* match_group (
|
|
matcher_t* matcher, const ase_byte_t* base, match_t* mat)
|
|
{
|
|
const ase_byte_t* p = base;
|
|
const code_t* cp;
|
|
match_t mat2;
|
|
ase_size_t si = 0, grp_len_static[16], * grp_len;
|
|
|
|
cp = (const code_t*)p; p += ASE_SIZEOF(*cp);
|
|
ASE_ASSERT (cp->cmd == CMD_GROUP);
|
|
|
|
mat->matched = ase_false;
|
|
mat->match_len = 0;
|
|
|
|
/*
|
|
* A grouped pattern, unlike other atoms, can match one or more
|
|
* characters. When it is requested with a variable occurrences,
|
|
* the number of characters that have matched at each occurrence
|
|
* needs to be remembered for the backtracking purpose.
|
|
*
|
|
* An array "grp_len" is used to store the accumulated number of
|
|
* characters. grp_len[0] is set to zero always for convenience.
|
|
* grp_len[1] holds the number of characters that have matched
|
|
* at the first occurrence, grp_len[2] at the second occurrence,
|
|
* and so on.
|
|
*
|
|
* Look at the following example
|
|
*
|
|
* pattern: (abc){1,3}x string: abcabcabcxyz
|
|
*
|
|
* grp_len[3] => 9 -----------+
|
|
* grp_len[2] => 6 --------+ |
|
|
* grp_len[1] => 3 -----+ | |
|
|
* grp_len[0] => 0 --+ | | |
|
|
* | | | |
|
|
* abcabcabcxyz
|
|
*/
|
|
|
|
if (cp->ubound < ASE_COUNTOF(grp_len_static))
|
|
{
|
|
grp_len = grp_len_static;
|
|
}
|
|
else
|
|
{
|
|
grp_len = (ase_size_t*) ASE_MALLOC (
|
|
matcher->mmgr, ASE_SIZEOF(ase_size_t) * cp->ubound);
|
|
if (grp_len == ASE_NULL)
|
|
{
|
|
matcher->errnum = ASE_REX_ENOMEM;
|
|
return ASE_NULL;
|
|
}
|
|
}
|
|
|
|
grp_len[si] = 0;
|
|
|
|
mat2.match_ptr = mat->match_ptr;
|
|
while (si < cp->ubound)
|
|
{
|
|
if (mat2.match_ptr >= matcher->match.str.end) break;
|
|
|
|
if (match_pattern (matcher, p, &mat2) == ASE_NULL)
|
|
{
|
|
if (grp_len != grp_len_static)
|
|
ASE_FREE (matcher->mmgr, grp_len);
|
|
return ASE_NULL;
|
|
}
|
|
if (!mat2.matched) break;
|
|
|
|
grp_len[si+1] = grp_len[si] + mat2.match_len;
|
|
|
|
mat2.match_ptr += mat2.match_len;
|
|
mat2.match_len = 0;
|
|
mat2.matched = ase_false;
|
|
|
|
si++;
|
|
}
|
|
|
|
/* increment p by the length of the subpattern */
|
|
p += *(ase_size_t*)(p+ASE_SIZEOF(ase_size_t));
|
|
|
|
/* check the occurrences */
|
|
if (si >= cp->lbound && si <= cp->ubound)
|
|
{
|
|
if (cp->lbound == cp->ubound || p >= mat->branch_end)
|
|
{
|
|
mat->matched = ase_true;
|
|
mat->match_len = grp_len[si];
|
|
}
|
|
else
|
|
{
|
|
ASE_ASSERT (cp->ubound > cp->lbound);
|
|
|
|
do
|
|
{
|
|
const ase_byte_t* tmp;
|
|
|
|
mat2.match_ptr = &mat->match_ptr[grp_len[si]];
|
|
mat2.branch = mat->branch;
|
|
mat2.branch_end = mat->branch_end;
|
|
|
|
#ifdef DEBUG_REX
|
|
ase_dprintf (
|
|
ASE_T("match_group: GROUP si=%d [%s]\n"),
|
|
(unsigned)si, mat->match_ptr);
|
|
#endif
|
|
tmp = match_branch_body (matcher, p, &mat2);
|
|
if (tmp == ASE_NULL)
|
|
{
|
|
if (grp_len != grp_len_static)
|
|
ASE_FREE (matcher->mmgr, grp_len);
|
|
return ASE_NULL;
|
|
}
|
|
|
|
if (mat2.matched)
|
|
{
|
|
mat->matched = ase_true;
|
|
mat->match_len = grp_len[si] + mat2.match_len;
|
|
p = tmp;
|
|
break;
|
|
}
|
|
|
|
if (si <= cp->lbound) break;
|
|
si--;
|
|
}
|
|
while (1);
|
|
}
|
|
|
|
}
|
|
|
|
if (grp_len != grp_len_static) ASE_FREE (matcher->mmgr, grp_len);
|
|
return p;
|
|
}
|
|
|
|
static const ase_byte_t* match_occurrences (
|
|
matcher_t* matcher, ase_size_t si, const ase_byte_t* p,
|
|
ase_size_t lbound, ase_size_t ubound, match_t* mat)
|
|
{
|
|
ASE_ASSERT (si >= lbound && si <= ubound);
|
|
/* the match has been found */
|
|
|
|
if (lbound == ubound || p >= mat->branch_end)
|
|
{
|
|
/* if the match for fixed occurrences was
|
|
* requested or no atoms remain unchecked in
|
|
* the branch, the match is returned. */
|
|
mat->matched = ase_true;
|
|
mat->match_len = si;
|
|
}
|
|
else
|
|
{
|
|
/* Otherwise, it checks if the remaining atoms
|
|
* match the rest of the string
|
|
*
|
|
* Let's say the caller of this function was processing
|
|
* the first period character in the following example.
|
|
*
|
|
* pattern: .{1,3}xx string: xxxyy
|
|
*
|
|
* It scans up to the third "x" in the string. si is set
|
|
* to 3 and p points to the first "x" in the pattern.
|
|
* It doesn't change mat.match_ptr so mat.match_ptr remains
|
|
* the same.
|
|
*
|
|
* si = 3 p -----+ mat.match_ptr ---+
|
|
* | |
|
|
* .{1,3}xx xxxyy
|
|
*
|
|
* When the code reaches here, the string pointed at by
|
|
* &mat.match_ptr[si] is tried to match against the remaining
|
|
* pattern pointed at p.
|
|
*
|
|
* &mat.match_ptr[si] ---+
|
|
* |
|
|
* xxxyy
|
|
*
|
|
* If a match is found, the match and the previous match are
|
|
* merged and returned.
|
|
*
|
|
* If not, si is decremented by one and the match is performed
|
|
* from the string pointed at by &mat.match_ptr[si].
|
|
*
|
|
* &mat.match_ptr[si] --+
|
|
* |
|
|
* xxxyy
|
|
*
|
|
* This process is repeated until a match is found or si
|
|
* becomes less than lbound. (si never becomes less than
|
|
* lbound in the implementation below, though)
|
|
*/
|
|
|
|
ASE_ASSERT (ubound > lbound);
|
|
|
|
do
|
|
{
|
|
match_t mat2;
|
|
const ase_byte_t* tmp;
|
|
|
|
mat2.match_ptr = &mat->match_ptr[si];
|
|
mat2.branch = mat->branch;
|
|
mat2.branch_end = mat->branch_end;
|
|
|
|
#ifdef DEBUG_REX
|
|
ase_dprintf (
|
|
ASE_T("__match occurrences: si=%u [%s]\n"),
|
|
(unsigned)si, mat->match_ptr);
|
|
#endif
|
|
tmp = match_branch_body (matcher, p, &mat2);
|
|
|
|
if (mat2.matched)
|
|
{
|
|
mat->matched = ase_true;
|
|
mat->match_len = si + mat2.match_len;
|
|
p = tmp;
|
|
break;
|
|
}
|
|
|
|
if (si <= lbound) break;
|
|
si--;
|
|
}
|
|
while (1);
|
|
}
|
|
|
|
return p;
|
|
}
|
|
|
|
static ase_bool_t __test_charset (
|
|
matcher_t* matcher, const ase_byte_t* p, ase_size_t csc, ase_char_t c)
|
|
{
|
|
ase_size_t i;
|
|
|
|
for (i = 0; i < csc; i++)
|
|
{
|
|
ase_char_t c0, c1, c2;
|
|
|
|
c0 = *(const ase_char_t*)p;
|
|
p += ASE_SIZEOF(c0);
|
|
if (c0 == CHARSET_ONE)
|
|
{
|
|
c1 = *(const ase_char_t*)p;
|
|
if (matcher->ignorecase)
|
|
c1 = ASE_TOUPPER(matcher->ccls, c1);
|
|
#ifdef DEBUG_REX
|
|
ase_dprintf (
|
|
ASE_T("match_charset: <one> %c %c\n"), c, c1);
|
|
#endif
|
|
if (c == c1) return ase_true;
|
|
}
|
|
else if (c0 == CHARSET_RANGE)
|
|
{
|
|
c1 = *(const ase_char_t*)p;
|
|
p += ASE_SIZEOF(c1);
|
|
c2 = *(const ase_char_t*)p;
|
|
|
|
if (matcher->ignorecase)
|
|
{
|
|
c1 = ASE_TOUPPER(matcher->ccls, c1);
|
|
c2 = ASE_TOUPPER(matcher->ccls, c2);
|
|
}
|
|
#ifdef DEBUG_REX
|
|
ase_dprintf (
|
|
ASE_T("match_charset: <range> %c %c-%c\n"), c, c1, c2);
|
|
#endif
|
|
if (c >= c1 && c <= c2) return ase_true;
|
|
}
|
|
else if (c0 == CHARSET_CLASS)
|
|
{
|
|
c1 = *(const ase_char_t*)p;
|
|
#ifdef DEBUG_REX
|
|
ase_dprintf (
|
|
ASE_T("match_charset: <class> %c %s\n"),
|
|
c, __char_class[c1].name);
|
|
#endif
|
|
if (__char_class[c1].func (
|
|
matcher->ccls, c)) return ase_true;
|
|
}
|
|
else
|
|
{
|
|
ASE_ASSERT (!"should never happen - invalid charset code");
|
|
break;
|
|
}
|
|
|
|
p += ASE_SIZEOF(c1);
|
|
}
|
|
|
|
return ase_false;
|
|
}
|
|
|
|
static ase_bool_t cc_isalnum (ase_ccls_t* ccls, ase_char_t c)
|
|
{
|
|
return ASE_ISALNUM (ccls, c);
|
|
}
|
|
|
|
static ase_bool_t cc_isalpha (ase_ccls_t* ccls, ase_char_t c)
|
|
{
|
|
return ASE_ISALPHA (ccls, c);
|
|
}
|
|
|
|
static ase_bool_t cc_isblank (ase_ccls_t* ccls, ase_char_t c)
|
|
{
|
|
return c == ASE_T(' ') || c == ASE_T('\t');
|
|
}
|
|
|
|
static ase_bool_t cc_iscntrl (ase_ccls_t* ccls, ase_char_t c)
|
|
{
|
|
return ASE_ISCNTRL (ccls, c);
|
|
}
|
|
|
|
static ase_bool_t cc_isdigit (ase_ccls_t* ccls, ase_char_t c)
|
|
{
|
|
return ASE_ISDIGIT (ccls, c);
|
|
}
|
|
|
|
static ase_bool_t cc_isgraph (ase_ccls_t* ccls, ase_char_t c)
|
|
{
|
|
return ASE_ISGRAPH (ccls, c);
|
|
}
|
|
|
|
static ase_bool_t cc_islower (ase_ccls_t* ccls, ase_char_t c)
|
|
{
|
|
return ASE_ISLOWER (ccls, c);
|
|
}
|
|
|
|
static ase_bool_t cc_isprint (ase_ccls_t* ccls, ase_char_t c)
|
|
{
|
|
return ASE_ISPRINT (ccls, c);
|
|
}
|
|
|
|
static ase_bool_t cc_ispunct (ase_ccls_t* ccls, ase_char_t c)
|
|
{
|
|
return ASE_ISPUNCT (ccls, c);
|
|
}
|
|
|
|
static ase_bool_t cc_isspace (ase_ccls_t* ccls, ase_char_t c)
|
|
{
|
|
return ASE_ISSPACE (ccls, c);
|
|
}
|
|
|
|
static ase_bool_t cc_isupper (ase_ccls_t* ccls, ase_char_t c)
|
|
{
|
|
return ASE_ISUPPER (ccls, c);
|
|
}
|
|
|
|
static ase_bool_t cc_isxdigit (ase_ccls_t* ccls, ase_char_t c)
|
|
{
|
|
return ASE_ISXDIGIT (ccls, c);
|
|
}
|
|
|
|
#if 0
|
|
#define DPRINTF awk->prmfns.misc.dprintf
|
|
#define DCUSTOM awk->prmfns.misc.custom_data
|
|
|
|
void ase_awk_dprintrex (ase_awk_t* awk, void* rex)
|
|
{
|
|
__print_pattern (awk, rex);
|
|
DPRINTF (DCUSTOM, awk->prmfns.misc.custom_data, ASE_T("\n"));
|
|
}
|
|
|
|
static const ase_byte_t* __print_pattern (ase_awk_t* awk, const ase_byte_t* p)
|
|
{
|
|
ase_size_t i;
|
|
rhdr_t* rhdr;
|
|
|
|
rhdr = (rhdr_t*)p; p += ASE_SIZEOF(*rhdr);
|
|
|
|
for (i = 0; i < rhdr->nb; i++)
|
|
{
|
|
if (i != 0) DPRINTF (DCUSTOM, ASE_T("|"));
|
|
p = __print_branch (awk, p);
|
|
}
|
|
|
|
return p;
|
|
}
|
|
|
|
static const ase_byte_t* __print_branch (ase_awk_t* awk, const ase_byte_t* p)
|
|
{
|
|
ase_size_t i;
|
|
bhdr_t* bhdr;
|
|
|
|
bhdr = (bhdr_t*)p; p += ASE_SIZEOF(*bhdr);
|
|
|
|
for (i = 0; i < bhdr->na; i++)
|
|
{
|
|
p = __print_atom (awk, p);
|
|
}
|
|
|
|
return p;
|
|
}
|
|
|
|
static const ase_byte_t* __print_atom (ase_awk_t* awk, const ase_byte_t* p)
|
|
{
|
|
const code_t* cp = (const code_t*)p;
|
|
|
|
if (cp->cmd == CMD_BOL)
|
|
{
|
|
DPRINTF (DCUSTOM, ASE_T("^"));
|
|
p += ASE_SIZEOF(*cp);
|
|
}
|
|
else if (cp->cmd == CMD_EOL)
|
|
{
|
|
DPRINTF (DCUSTOM, ASE_T("$"));
|
|
p += ASE_SIZEOF(*cp);
|
|
}
|
|
else if (cp->cmd == CMD_ANY_CHAR)
|
|
{
|
|
DPRINTF (DCUSTOM, ASE_T("."));
|
|
p += ASE_SIZEOF(*cp);
|
|
}
|
|
else if (cp->cmd == CMD_ORD_CHAR)
|
|
{
|
|
p += ASE_SIZEOF(*cp);
|
|
DPRINTF (DCUSTOM, ASE_T("%c"), *(ase_char_t*)p);
|
|
p += ASE_SIZEOF(ase_char_t);
|
|
}
|
|
else if (cp->cmd == CMD_CHARSET)
|
|
{
|
|
ase_size_t i;
|
|
cshdr_t* cshdr;
|
|
|
|
p += ASE_SIZEOF(*cp);
|
|
DPRINTF (DCUSTOM, ASE_T("["));
|
|
if (cp->negate) DPRINTF (DCUSTOM, ASE_T("^"));
|
|
|
|
cshdr = (cshdr_t*)p; p += ASE_SIZEOF(*cshdr);
|
|
|
|
for (i = 0; i < cshdr->csc; i++)
|
|
{
|
|
ase_char_t c0, c1, c2;
|
|
|
|
c0 = *(ase_char_t*)p;
|
|
p += ASE_SIZEOF(c0);
|
|
|
|
if (c0 == CHARSET_ONE)
|
|
{
|
|
c1 = *(ase_char_t*)p;
|
|
DPRINTF (DCUSTOM, ASE_T("%c"), c1);
|
|
}
|
|
else if (c0 == CHARSET_RANGE)
|
|
{
|
|
c1 = *(ase_char_t*)p;
|
|
p += ASE_SIZEOF(c1);
|
|
c2 = *(ase_char_t*)p;
|
|
DPRINTF (DCUSTOM, ASE_T("%c-%c"), c1, c2);
|
|
}
|
|
else if (c0 == CHARSET_CLASS)
|
|
{
|
|
c1 = *(ase_char_t*)p;
|
|
DPRINTF (DCUSTOM, ASE_T("[:%s:]"), __char_class[c1].name);
|
|
}
|
|
else
|
|
{
|
|
DPRINTF (DCUSTOM, ASE_T("should never happen - invalid charset code\n"));
|
|
}
|
|
|
|
p += ASE_SIZEOF(c1);
|
|
}
|
|
|
|
DPRINTF (DCUSTOM, ASE_T("]"));
|
|
}
|
|
else if (cp->cmd == CMD_GROUP)
|
|
{
|
|
p += ASE_SIZEOF(*cp);
|
|
DPRINTF (DCUSTOM, ASE_T("("));
|
|
p = __print_pattern (awk, p);
|
|
DPRINTF (DCUSTOM, ASE_T(")"));
|
|
}
|
|
else
|
|
{
|
|
DPRINTF (DCUSTOM, ASE_T("should never happen - invalid atom code\n"));
|
|
}
|
|
|
|
if (cp->lbound == 0 && cp->ubound == BOUND_MAX)
|
|
DPRINTF (DCUSTOM, ASE_T("*"));
|
|
else if (cp->lbound == 1 && cp->ubound == BOUND_MAX)
|
|
DPRINTF (DCUSTOM, ASE_T("+"));
|
|
else if (cp->lbound == 0 && cp->ubound == 1)
|
|
DPRINTF (DCUSTOM, ASE_T("?"));
|
|
else if (cp->lbound != 1 || cp->ubound != 1)
|
|
{
|
|
DPRINTF (DCUSTOM, ASE_T("{%lu,%lu}"),
|
|
(unsigned long)cp->lbound, (unsigned long)cp->ubound);
|
|
}
|
|
|
|
return p;
|
|
}
|
|
|
|
#endif
|