253 lines
8.6 KiB
C++
253 lines
8.6 KiB
C++
// © 2016 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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/*
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* Copyright (C) 2001-2011, International Business Machines Corporation
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* and others. All Rights Reserved.
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**********************************************************************
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* Date Name Description
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* 07/23/01 aliu Creation.
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**********************************************************************
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*/
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#ifndef STRMATCH_H
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#define STRMATCH_H
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#include "unicode/utypes.h"
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#if !UCONFIG_NO_TRANSLITERATION
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#include "unicode/unistr.h"
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#include "unicode/unifunct.h"
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#include "unicode/unimatch.h"
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#include "unicode/unirepl.h"
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U_NAMESPACE_BEGIN
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class TransliterationRuleData;
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/**
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* An object that matches a fixed input string, implementing the
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* UnicodeMatcher API. This object also implements the
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* UnicodeReplacer API, allowing it to emit the matched text as
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* output. Since the match text may contain flexible match elements,
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* such as UnicodeSets, the emitted text is not the match pattern, but
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* instead a substring of the actual matched text. Following
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* convention, the output text is the leftmost match seen up to this
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* point.
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*
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* A StringMatcher may represent a segment, in which case it has a
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* positive segment number. This affects how the matcher converts
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* itself to a pattern but does not otherwise affect its function.
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*
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* A StringMatcher that is not a segment should not be used as a
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* UnicodeReplacer.
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*/
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class StringMatcher : public UnicodeFunctor, public UnicodeMatcher, public UnicodeReplacer {
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public:
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/**
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* Construct a matcher that matches the given pattern string.
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* @param string the pattern to be matched, possibly containing
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* stand-ins that represent nested UnicodeMatcher objects.
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* @param start inclusive start index of text to be replaced
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* @param limit exclusive end index of text to be replaced;
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* must be greater than or equal to start
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* @param segmentNum the segment number from 1..n, or 0 if this is
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* not a segment.
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* @param data context object mapping stand-ins to
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* UnicodeMatcher objects.
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*/
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StringMatcher(const UnicodeString& string,
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int32_t start,
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int32_t limit,
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int32_t segmentNum,
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const TransliterationRuleData& data);
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/**
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* Copy constructor
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* @param o the object to be copied.
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*/
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StringMatcher(const StringMatcher& o);
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/**
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* Destructor
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*/
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virtual ~StringMatcher();
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/**
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* Implement UnicodeFunctor
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* @return a copy of the object.
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*/
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virtual StringMatcher* clone() const override;
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/**
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* UnicodeFunctor API. Cast 'this' to a UnicodeMatcher* pointer
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* and return the pointer.
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* @return the UnicodeMatcher point.
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*/
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virtual UnicodeMatcher* toMatcher() const override;
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/**
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* UnicodeFunctor API. Cast 'this' to a UnicodeReplacer* pointer
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* and return the pointer.
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* @return the UnicodeReplacer pointer.
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*/
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virtual UnicodeReplacer* toReplacer() const override;
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/**
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* Implement UnicodeMatcher
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* @param text the text to be matched
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* @param offset on input, the index into text at which to begin
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* matching. On output, the limit of the matched text. The
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* number of matched characters is the output value of offset
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* minus the input value. Offset should always point to the
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* HIGH SURROGATE (leading code unit) of a pair of surrogates,
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* both on entry and upon return.
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* @param limit the limit index of text to be matched. Greater
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* than offset for a forward direction match, less than offset for
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* a backward direction match. The last character to be
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* considered for matching will be text.charAt(limit-1) in the
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* forward direction or text.charAt(limit+1) in the backward
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* direction.
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* @param incremental if true, then assume further characters may
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* be inserted at limit and check for partial matching. Otherwise
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* assume the text as given is complete.
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* @return a match degree value indicating a full match, a partial
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* match, or a mismatch. If incremental is false then
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* U_PARTIAL_MATCH should never be returned.
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*/
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virtual UMatchDegree matches(const Replaceable& text,
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int32_t& offset,
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int32_t limit,
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UBool incremental) override;
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/**
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* Implement UnicodeMatcher
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* @param result Output param to receive the pattern.
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* @param escapeUnprintable if True then escape the unprintable characters.
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* @return A reference to 'result'.
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*/
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virtual UnicodeString& toPattern(UnicodeString& result,
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UBool escapeUnprintable = false) const override;
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/**
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* Implement UnicodeMatcher
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* Returns true if this matcher will match a character c, where c
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* & 0xFF == v, at offset, in the forward direction (with limit >
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* offset). This is used by <tt>RuleBasedTransliterator</tt> for
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* indexing.
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* @param v the given value
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* @return true if this matcher will match a character c,
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* where c & 0xFF == v
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*/
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virtual UBool matchesIndexValue(uint8_t v) const override;
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/**
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* Implement UnicodeMatcher
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*/
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virtual void addMatchSetTo(UnicodeSet& toUnionTo) const override;
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/**
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* Implement UnicodeFunctor
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*/
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virtual void setData(const TransliterationRuleData*) override;
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/**
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* Replace characters in 'text' from 'start' to 'limit' with the
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* output text of this object. Update the 'cursor' parameter to
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* give the cursor position and return the length of the
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* replacement text.
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*
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* @param text the text to be matched
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* @param start inclusive start index of text to be replaced
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* @param limit exclusive end index of text to be replaced;
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* must be greater than or equal to start
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* @param cursor output parameter for the cursor position.
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* Not all replacer objects will update this, but in a complete
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* tree of replacer objects, representing the entire output side
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* of a transliteration rule, at least one must update it.
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* @return the number of 16-bit code units in the text replacing
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* the characters at offsets start..(limit-1) in text
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*/
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virtual int32_t replace(Replaceable& text,
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int32_t start,
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int32_t limit,
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int32_t& cursor) override;
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/**
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* Returns a string representation of this replacer. If the
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* result of calling this function is passed to the appropriate
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* parser, typically TransliteratorParser, it will produce another
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* replacer that is equal to this one.
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* @param result the string to receive the pattern. Previous
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* contents will be deleted.
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* @param escapeUnprintable if true then convert unprintable
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* character to their hex escape representations, \\uxxxx or
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* \\Uxxxxxxxx. Unprintable characters are defined by
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* Utility.isUnprintable().
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* @return a reference to 'result'.
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*/
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virtual UnicodeString& toReplacerPattern(UnicodeString& result,
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UBool escapeUnprintable) const override;
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/**
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* Remove any match data. This must be called before performing a
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* set of matches with this segment.
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*/
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void resetMatch();
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/**
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* ICU "poor man's RTTI", returns a UClassID for the actual class.
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*/
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virtual UClassID getDynamicClassID() const override;
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/**
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* ICU "poor man's RTTI", returns a UClassID for this class.
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*/
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static UClassID U_EXPORT2 getStaticClassID();
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/**
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* Union the set of all characters that may output by this object
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* into the given set.
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* @param toUnionTo the set into which to union the output characters
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*/
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virtual void addReplacementSetTo(UnicodeSet& toUnionTo) const override;
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private:
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/**
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* The text to be matched.
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*/
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UnicodeString pattern;
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/**
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* Context object that maps stand-ins to matcher and replacer
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* objects.
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*/
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const TransliterationRuleData* data;
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/**
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* The segment number, 1-based, or 0 if not a segment.
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*/
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int32_t segmentNumber;
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/**
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* Start offset, in the match text, of the <em>rightmost</em>
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* match.
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*/
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int32_t matchStart;
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/**
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* Limit offset, in the match text, of the <em>rightmost</em>
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* match.
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*/
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int32_t matchLimit;
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};
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U_NAMESPACE_END
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#endif /* #if !UCONFIG_NO_TRANSLITERATION */
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#endif
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