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+/* $Id$ */
+/* 
+ * Copyright (C) 2008-2011 Teluu Inc. (http://www.teluu.com)
+ * Copyright (C) 2003-2008 Benny Prijono <benny@prijono.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
+ */
+#ifndef __PJ_SCANNER_H__
+#define __PJ_SCANNER_H__
+
+/**
+ * @file scanner.h
+ * @brief Text Scanning.
+ */
+
+#include <pjlib-util/types.h>
+
+PJ_BEGIN_DECL
+
+/**
+ * @defgroup PJ_SCAN Fast Text Scanning
+ * @ingroup PJLIB_TEXT
+ * @brief Text scanning utility.
+ *
+ * This module describes a fast text scanning functions.
+ *
+ * @{
+ */
+#if defined(PJ_SCANNER_USE_BITWISE) && PJ_SCANNER_USE_BITWISE != 0
+#  include <pjlib-util/scanner_cis_bitwise.h>
+#else
+#  include <pjlib-util/scanner_cis_uint.h>
+#endif
+
+/**
+ * Initialize scanner input specification buffer.
+ *
+ * @param cs_buf    The scanner character specification.
+ */
+PJ_DECL(void) pj_cis_buf_init(pj_cis_buf_t *cs_buf);
+
+/**
+ * Create a new input specification.
+ *
+ * @param cs_buf    Specification buffer.
+ * @param cis       Character input specification to be initialized.
+ *
+ * @return          PJ_SUCCESS if new specification has been successfully
+ *                  created, or PJ_ETOOMANY if there are already too many
+ *                  specifications in the buffer.
+ */
+PJ_DECL(pj_status_t) pj_cis_init(pj_cis_buf_t *cs_buf, pj_cis_t *cis);
+
+/**
+ * Create a new input specification based on an existing specification.
+ *
+ * @param new_cis   The new specification to be initialized.
+ * @param existing  The existing specification, from which the input
+ *                  bitmask will be copied to the new specification.
+ *
+ * @return          PJ_SUCCESS if new specification has been successfully
+ *                  created, or PJ_ETOOMANY if there are already too many
+ *                  specifications in the buffer.
+ */
+PJ_DECL(pj_status_t) pj_cis_dup(pj_cis_t *new_cis, pj_cis_t *existing);
+
+/**
+ * Add the characters in the specified range '[cstart, cend)' to the 
+ * specification (the last character itself ('cend') is not added).
+ *
+ * @param cis       The scanner character specification.
+ * @param cstart    The first character in the range.
+ * @param cend      The next character after the last character in the range.
+ */
+PJ_DECL(void) pj_cis_add_range( pj_cis_t *cis, int cstart, int cend);
+
+/**
+ * Add alphabetic characters to the specification.
+ *
+ * @param cis       The scanner character specification.
+ */
+PJ_DECL(void) pj_cis_add_alpha( pj_cis_t *cis);
+
+/**
+ * Add numeric characters to the specification.
+ *
+ * @param cis       The scanner character specification.
+ */
+PJ_DECL(void) pj_cis_add_num( pj_cis_t *cis);
+
+/**
+ * Add the characters in the string to the specification.
+ *
+ * @param cis       The scanner character specification.
+ * @param str       The string.
+ */
+PJ_DECL(void) pj_cis_add_str( pj_cis_t *cis, const char *str);
+
+/**
+ * Add specification from another specification.
+ *
+ * @param cis	    The specification is to be set.
+ * @param rhs	    The specification to be copied.
+ */
+PJ_DECL(void) pj_cis_add_cis( pj_cis_t *cis, const pj_cis_t *rhs);
+
+/**
+ * Delete characters in the specified range from the specification.
+ *
+ * @param cis       The scanner character specification.
+ * @param cstart    The first character in the range.
+ * @param cend      The next character after the last character in the range.
+ */
+PJ_DECL(void) pj_cis_del_range( pj_cis_t *cis, int cstart, int cend);
+
+/**
+ * Delete characters in the specified string from the specification.
+ *
+ * @param cis       The scanner character specification.
+ * @param str       The string.
+ */
+PJ_DECL(void) pj_cis_del_str( pj_cis_t *cis, const char *str);
+
+/**
+ * Invert specification.
+ *
+ * @param cis       The scanner character specification.
+ */
+PJ_DECL(void) pj_cis_invert( pj_cis_t *cis );
+
+/**
+ * Check whether the specified character belongs to the specification.
+ *
+ * @param cis       The scanner character specification.
+ * @param c         The character to check for matching.
+ *
+ * @return	    Non-zero if match (not necessarily one).
+ */
+PJ_INLINE(int) pj_cis_match( const pj_cis_t *cis, pj_uint8_t c )
+{
+    return PJ_CIS_ISSET(cis, c);
+}
+
+
+/**
+ * Flags for scanner.
+ */
+enum
+{
+    /** This flags specifies that the scanner should automatically skip
+	whitespaces 
+     */
+    PJ_SCAN_AUTOSKIP_WS = 1,
+
+    /** This flags specifies that the scanner should automatically skip
+        SIP header continuation. This flag implies PJ_SCAN_AUTOSKIP_WS.
+     */
+    PJ_SCAN_AUTOSKIP_WS_HEADER = 3,
+
+    /** Auto-skip new lines.
+     */
+    PJ_SCAN_AUTOSKIP_NEWLINE = 4
+};
+
+
+/* Forward decl. */
+struct pj_scanner;
+
+
+/**
+ * The callback function type to be called by the scanner when it encounters
+ * syntax error.
+ *
+ * @param scanner       The scanner instance that calls the callback .
+ */
+typedef void (*pj_syn_err_func_ptr)(struct pj_scanner *scanner);
+
+
+/**
+ * The text scanner structure.
+ */
+typedef struct pj_scanner
+{
+    char *begin;        /**< Start of input buffer.	*/
+    char *end;          /**< End of input buffer.	*/
+    char *curptr;       /**< Current pointer.		*/
+    int   line;         /**< Current line.		*/
+    char *start_line;   /**< Where current line starts.	*/
+    int   skip_ws;      /**< Skip whitespace flag.	*/
+    pj_syn_err_func_ptr callback;   /**< Syntax error callback. */
+} pj_scanner;
+
+
+/**
+ * This structure can be used by application to store the state of the parser,
+ * so that the scanner state can be rollback to this state when necessary.
+ */
+typedef struct pj_scan_state
+{
+    char *curptr;       /**< Current scanner's pointer. */
+    int   line;         /**< Current line.		*/
+    char *start_line;   /**< Start of current line.	*/
+} pj_scan_state;
+
+
+/**
+ * Initialize the scanner. Note that the input string buffer must have
+ * length at least buflen+1 because the scanner will NULL terminate the
+ * string during initialization.
+ *
+ * @param scanner   The scanner to be initialized.
+ * @param bufstart  The input buffer to scan. Note that buffer[buflen] will be 
+ *		    filled with NULL char until scanner is destroyed, so
+ *		    the actual buffer length must be at least buflen+1.
+ * @param buflen    The length of the input buffer, which normally is
+ *		    strlen(bufstart).
+ * @param options   Zero, or combination of PJ_SCAN_AUTOSKIP_WS or
+ *		    PJ_SCAN_AUTOSKIP_WS_HEADER
+ * @param callback  Callback to be called when the scanner encounters syntax
+ *		    error condition.
+ */
+PJ_DECL(void) pj_scan_init( pj_scanner *scanner, char *bufstart, 
+			    pj_size_t buflen, 
+			    unsigned options,
+			    pj_syn_err_func_ptr callback );
+
+
+/** 
+ * Call this function when application has finished using the scanner.
+ *
+ * @param scanner   The scanner.
+ */
+PJ_DECL(void) pj_scan_fini( pj_scanner *scanner );
+
+
+/** 
+ * Determine whether the EOF condition for the scanner has been met.
+ *
+ * @param scanner   The scanner.
+ *
+ * @return Non-zero if scanner is EOF.
+ */
+PJ_INLINE(int) pj_scan_is_eof( const pj_scanner *scanner)
+{
+    return scanner->curptr >= scanner->end;
+}
+
+
+/** 
+ * Peek strings in current position according to parameter spec, and return
+ * the strings in parameter out. The current scanner position will not be
+ * moved. If the scanner is already in EOF state, syntax error callback will
+ * be called thrown.
+ *
+ * @param scanner   The scanner.
+ * @param spec	    The spec to match input string.
+ * @param out	    String to store the result.
+ *
+ * @return the character right after the peek-ed position or zero if there's
+ *	   no more characters.
+ */
+PJ_DECL(int) pj_scan_peek( pj_scanner *scanner,
+			   const pj_cis_t *spec, pj_str_t *out);
+
+
+/** 
+ * Peek len characters in current position, and return them in out parameter.
+ * Note that whitespaces or newlines will be returned as it is, regardless
+ * of PJ_SCAN_AUTOSKIP_WS settings. If the character left is less than len, 
+ * syntax error callback will be called.
+ *
+ * @param scanner   The scanner.
+ * @param len	    Length to peek.
+ * @param out	    String to store the result.
+ *
+ * @return the character right after the peek-ed position or zero if there's
+ *	   no more characters.
+ */
+PJ_DECL(int) pj_scan_peek_n( pj_scanner *scanner,
+			     pj_size_t len, pj_str_t *out);
+
+
+/** 
+ * Peek strings in current position until spec is matched, and return
+ * the strings in parameter out. The current scanner position will not be
+ * moved. If the scanner is already in EOF state, syntax error callback will
+ * be called.
+ *
+ * @param scanner   The scanner.
+ * @param spec	    The peeking will stop when the input match this spec.
+ * @param out	    String to store the result.
+ *
+ * @return the character right after the peek-ed position.
+ */
+PJ_DECL(int) pj_scan_peek_until( pj_scanner *scanner,
+				 const pj_cis_t *spec, 
+				 pj_str_t *out);
+
+
+/** 
+ * Get characters from the buffer according to the spec, and return them
+ * in out parameter. The scanner will attempt to get as many characters as
+ * possible as long as the spec matches. If the first character doesn't
+ * match the spec, or scanner is already in EOF when this function is called,
+ * an exception will be thrown.
+ *
+ * @param scanner   The scanner.
+ * @param spec	    The spec to match input string.
+ * @param out	    String to store the result.
+ */
+PJ_DECL(void) pj_scan_get( pj_scanner *scanner,
+			   const pj_cis_t *spec, pj_str_t *out);
+
+
+/** 
+ * Just like #pj_scan_get(), but additionally performs unescaping when
+ * escaped ('%') character is found. The input spec MUST NOT contain the
+ * specification for '%' characted.
+ *
+ * @param scanner   The scanner.
+ * @param spec	    The spec to match input string.
+ * @param out	    String to store the result.
+ */
+PJ_DECL(void) pj_scan_get_unescape( pj_scanner *scanner,
+				    const pj_cis_t *spec, pj_str_t *out);
+
+
+/** 
+ * Get characters between quotes. If current input doesn't match begin_quote,
+ * syntax error will be thrown. Note that the resulting string will contain
+ * the enclosing quote.
+ *
+ * @param scanner	The scanner.
+ * @param begin_quote	The character to begin the quote.
+ * @param end_quote	The character to end the quote.
+ * @param out		String to store the result.
+ */
+PJ_DECL(void) pj_scan_get_quote( pj_scanner *scanner,
+				 int begin_quote, int end_quote, 
+				 pj_str_t *out);
+
+/** 
+ * Get characters between quotes. If current input doesn't match begin_quote,
+ * syntax error will be thrown. Note that the resulting string will contain
+ * the enclosing quote.
+ *
+ * @param scanner	The scanner.
+ * @param begin_quotes  The character array to begin the quotes. For example,
+ *                      the two characters " and '.
+ * @param end_quotes    The character array to end the quotes. The position
+ *                      found in the begin_quotes array will be used to match
+ *                      the end quotes. So if the begin_quotes was the array
+ *                      of "'< the end_quotes should be "'>. If begin_array
+ *                      matched the ' then the end_quotes will look for ' to
+ *                      match at the end.
+ * @param qsize         The size of the begin_quotes and end_quotes arrays.
+ * @param out           String to store the result.
+ */
+PJ_DECL(void) pj_scan_get_quotes(pj_scanner *scanner,
+                                 const char *begin_quotes,
+                                 const char *end_quotes, int qsize,
+                                 pj_str_t *out);
+
+
+/**
+ * Get N characters from the scanner.
+ *
+ * @param scanner   The scanner.
+ * @param N	    Number of characters to get.
+ * @param out	    String to store the result.
+ */
+PJ_DECL(void) pj_scan_get_n( pj_scanner *scanner,
+			     unsigned N, pj_str_t *out);
+
+
+/** 
+ * Get one character from the scanner.
+ *
+ * @param scanner   The scanner.
+ *
+ * @return The character.
+ */
+PJ_DECL(int) pj_scan_get_char( pj_scanner *scanner );
+
+
+/** 
+ * Get characters from the scanner and move the scanner position until the
+ * current character matches the spec.
+ *
+ * @param scanner   The scanner.
+ * @param spec	    Get until the input match this spec.
+ * @param out	    String to store the result.
+ */
+PJ_DECL(void) pj_scan_get_until( pj_scanner *scanner,
+				 const pj_cis_t *spec, pj_str_t *out);
+
+
+/** 
+ * Get characters from the scanner and move the scanner position until the
+ * current character matches until_char.
+ *
+ * @param scanner	The scanner.
+ * @param until_char    Get until the input match this character.
+ * @param out		String to store the result.
+ */
+PJ_DECL(void) pj_scan_get_until_ch( pj_scanner *scanner, 
+				    int until_char, pj_str_t *out);
+
+
+/** 
+ * Get characters from the scanner and move the scanner position until the
+ * current character matches until_char.
+ *
+ * @param scanner	The scanner.
+ * @param until_spec	Get until the input match any of these characters.
+ * @param out		String to store the result.
+ */
+PJ_DECL(void) pj_scan_get_until_chr( pj_scanner *scanner,
+				     const char *until_spec, pj_str_t *out);
+
+/** 
+ * Advance the scanner N characters, and skip whitespace
+ * if necessary.
+ *
+ * @param scanner   The scanner.
+ * @param N	    Number of characters to skip.
+ * @param skip	    Flag to specify whether whitespace should be skipped
+ *		    after skipping the characters.
+ */
+PJ_DECL(void) pj_scan_advance_n( pj_scanner *scanner,
+				 unsigned N, pj_bool_t skip);
+
+
+/** 
+ * Compare string in current position with the specified string.
+ * 
+ * @param scanner   The scanner.
+ * @param s	    The string to compare with.
+ * @param len	    Length of the string to compare.
+ *
+ * @return zero, <0, or >0 (just like strcmp()).
+ */
+PJ_DECL(int) pj_scan_strcmp( pj_scanner *scanner, const char *s, int len);
+
+
+/** 
+ * Case-less string comparison of current position with the specified
+ * string.
+ *
+ * @param scanner   The scanner.
+ * @param s	    The string to compare with.
+ * @param len	    Length of the string to compare with.
+ *
+ * @return zero, <0, or >0 (just like strcmp()).
+ */
+PJ_DECL(int) pj_scan_stricmp( pj_scanner *scanner, const char *s, int len);
+
+/**
+ * Perform case insensitive string comparison of string in current position,
+ * knowing that the string to compare only consists of alphanumeric
+ * characters.
+ *
+ * Note that unlike #pj_scan_stricmp, this function can only return zero or
+ * -1.
+ *
+ * @param scanner   The scanner.
+ * @param s	    The string to compare with.
+ * @param len	    Length of the string to compare with.
+ *
+ * @return	    zero if equal or -1.
+ *
+ * @see strnicmp_alnum, pj_stricmp_alnum
+ */
+PJ_DECL(int) pj_scan_stricmp_alnum( pj_scanner *scanner, const char *s, 
+				    int len);
+
+
+/** 
+ * Get a newline from the scanner. A newline is defined as '\\n', or '\\r', or
+ * "\\r\\n". If current input is not newline, syntax error will be thrown.
+ *
+ * @param scanner   The scanner.
+ */
+PJ_DECL(void) pj_scan_get_newline( pj_scanner *scanner );
+
+
+/** 
+ * Manually skip whitespaces according to flag that was specified when
+ * the scanner was initialized.
+ *
+ * @param scanner   The scanner.
+ */
+PJ_DECL(void) pj_scan_skip_whitespace( pj_scanner *scanner );
+
+
+/**
+ * Skip current line.
+ *
+ * @param scanner   The scanner.
+ */
+PJ_DECL(void) pj_scan_skip_line( pj_scanner *scanner );
+
+/** 
+ * Save the full scanner state.
+ *
+ * @param scanner   The scanner.
+ * @param state	    Variable to store scanner's state.
+ */
+PJ_DECL(void) pj_scan_save_state( const pj_scanner *scanner, 
+				  pj_scan_state *state);
+
+
+/** 
+ * Restore the full scanner state.
+ * Note that this would not restore the string if application has modified
+ * it. This will only restore the scanner scanning position.
+ *
+ * @param scanner   The scanner.
+ * @param state	    State of the scanner.
+ */
+PJ_DECL(void) pj_scan_restore_state( pj_scanner *scanner, 
+				     pj_scan_state *state);
+
+/**
+ * Get current column position.
+ *
+ * @param scanner   The scanner.
+ *
+ * @return	    The column position.
+ */
+PJ_INLINE(int) pj_scan_get_col( const pj_scanner *scanner )
+{
+    return (int)(scanner->curptr - scanner->start_line);
+}
+
+/**
+ * @}
+ */
+
+
+PJ_END_DECL
+
+#endif
+