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/******************************************************************************
* Copyright (c) 2000-2021 Ericsson Telecom AB
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.html
*
* Contributors:
* Baranyi, Botond – initial implementation
*
******************************************************************************/
#ifndef UNICHARPATTERN_HH
#define UNICHARPATTERN_HH
#include "Quadruple.hh"
/** Helper class for handling case-insensitive universal charstring patterns
* (this includes all patterns used in universal charstring templates and
* universal charstring subtypes, and the universal charstring version of
* the predefined function 'regexp', as long as they have the '@nocase' modifier)
*
* Only one (global) instance of this class is created, which is used to convert
* the uppercase letters in patterns and the strings matched by the patterns
* to lowercase.
*
* The instance is initialized with a table at its construction, which contains
* the case mappings of Unicode characters (read from the file CaseFolding.txt,
* from the official Unicode site).
*
* This class does simple case foldings (from the folding types described in
* CaseFolding.txt), so only the mappings with statuses 'C' and 'S' are used. */
class UnicharPattern {
/** structure containing one character's mapping (linked list) */
struct mapping_t {
/** character mapped from (uppercase letter) */
Quad from;
/** character mapped to (lowercase letter) */
Quad to;
/** pointer to the next element in the list */
mapping_t* next;
};
/** pointer to the head of the linked list of mappings */
mapping_t* mappings_head;
/** deletes the mappings list */
void clean_up();
/** finds and returns the mapping list element with the 'from' character
* equivalent to the parameter */
mapping_t* find_mapping(const Quad& q) const;
public:
/** constructor - reads the case mappings from a text file and stores them
* in the linked list */
UnicharPattern();
/** destructor - deletes the list */
~UnicharPattern() { clean_up(); }
/** converts the specified character to lowercase (if it's an uppercase letter),
* and returns the result */
Quad convert_quad_to_lowercase(const Quad& q) const;
/** goes through the null-terminated regex string parameter and changes each
* uppercase letter to its lowercase equivalent
* @param str a universal charstring in regex format (meaning that every universal
* character is coded as 8 characters from 'A' to 'P', each representing a
* hexadecimal digit in the universal character's code) */
void convert_regex_str_to_lowercase(char* str) const;
};
/** The one instance of the universal charstring pattern helper class. */
extern UnicharPattern unichar_pattern;
#endif /* UNICHARPATTERN_HH */
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