1548 lines
53 KiB
C++
1548 lines
53 KiB
C++
/*
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**********************************************************************
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* Copyright (C) 1999-2001, International Business Machines
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* Corporation and others. All Rights Reserved.
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**********************************************************************
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* Date Name Description
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* 11/17/99 aliu Creation.
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**********************************************************************
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*/
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#include "unicode/utypes.h"
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#if !UCONFIG_NO_TRANSLITERATION
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#include "unicode/uobject.h"
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#include "unicode/parseerr.h"
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#include "unicode/parsepos.h"
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#include "unicode/putil.h"
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#include "unicode/uchar.h"
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#include "unicode/ustring.h"
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#include "unicode/uniset.h"
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#include "cstring.h"
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#include "funcrepl.h"
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#include "hash.h"
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#include "quant.h"
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#include "rbt.h"
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#include "rbt_data.h"
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#include "rbt_pars.h"
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#include "rbt_rule.h"
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#include "strmatch.h"
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#include "strrepl.h"
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#include "symtable.h"
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#include "tridpars.h"
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#include "uvector.h"
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#include "util.h"
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#include "cmemory.h"
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#include "uprops.h"
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// Operators
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#define VARIABLE_DEF_OP ((UChar)0x003D) /*=*/
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#define FORWARD_RULE_OP ((UChar)0x003E) /*>*/
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#define REVERSE_RULE_OP ((UChar)0x003C) /*<*/
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#define FWDREV_RULE_OP ((UChar)0x007E) /*~*/ // internal rep of <> op
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// Other special characters
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#define QUOTE ((UChar)0x0027) /*'*/
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#define ESCAPE ((UChar)0x005C) /*\*/
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#define END_OF_RULE ((UChar)0x003B) /*;*/
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#define RULE_COMMENT_CHAR ((UChar)0x0023) /*#*/
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#define SEGMENT_OPEN ((UChar)0x0028) /*(*/
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#define SEGMENT_CLOSE ((UChar)0x0029) /*)*/
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#define CONTEXT_ANTE ((UChar)0x007B) /*{*/
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#define CONTEXT_POST ((UChar)0x007D) /*}*/
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#define CURSOR_POS ((UChar)0x007C) /*|*/
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#define CURSOR_OFFSET ((UChar)0x0040) /*@*/
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#define ANCHOR_START ((UChar)0x005E) /*^*/
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#define KLEENE_STAR ((UChar)0x002A) /***/
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#define ONE_OR_MORE ((UChar)0x002B) /*+*/
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#define ZERO_OR_ONE ((UChar)0x003F) /*?*/
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#define DOT ((UChar)46) /*.*/
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static const UChar DOT_SET[] = { // "[^[:Zp:][:Zl:]\r\n$]";
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91, 94, 91, 58, 90, 112, 58, 93, 91, 58, 90,
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108, 58, 93, 92, 114, 92, 110, 36, 93, 0
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};
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// A function is denoted &Source-Target/Variant(text)
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#define FUNCTION ((UChar)38) /*&*/
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// Aliases for some of the syntax characters. These are provided so
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// transliteration rules can be expressed in XML without clashing with
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// XML syntax characters '<', '>', and '&'.
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#define ALT_REVERSE_RULE_OP ((UChar)0x2190) // Left Arrow
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#define ALT_FORWARD_RULE_OP ((UChar)0x2192) // Right Arrow
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#define ALT_FWDREV_RULE_OP ((UChar)0x2194) // Left Right Arrow
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#define ALT_FUNCTION ((UChar)0x2206) // Increment (~Greek Capital Delta)
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// Special characters disallowed at the top level
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static const UChar ILLEGAL_TOP[] = {41,0}; // ")"
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// Special characters disallowed within a segment
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static const UChar ILLEGAL_SEG[] = {123,125,124,64,0}; // "{}|@"
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// Special characters disallowed within a function argument
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static const UChar ILLEGAL_FUNC[] = {94,40,46,42,43,63,123,125,124,64,0}; // "^(.*+?{}|@"
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// By definition, the ANCHOR_END special character is a
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// trailing SymbolTable.SYMBOL_REF character.
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// private static final char ANCHOR_END = '$';
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static const UChar gOPERATORS[] = { // "=><"
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VARIABLE_DEF_OP, FORWARD_RULE_OP, REVERSE_RULE_OP,
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ALT_FORWARD_RULE_OP, ALT_REVERSE_RULE_OP, ALT_FWDREV_RULE_OP,
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0
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};
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static const UChar HALF_ENDERS[] = { // "=><;"
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VARIABLE_DEF_OP, FORWARD_RULE_OP, REVERSE_RULE_OP,
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ALT_FORWARD_RULE_OP, ALT_REVERSE_RULE_OP, ALT_FWDREV_RULE_OP,
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END_OF_RULE,
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0
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};
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// These are also used in Transliterator::toRules()
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static const int32_t ID_TOKEN_LEN = 2;
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static const UChar ID_TOKEN[] = { 0x3A, 0x3A }; // ':', ':'
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U_NAMESPACE_BEGIN
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//----------------------------------------------------------------------
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// BEGIN ParseData
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//----------------------------------------------------------------------
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/**
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* This class implements the SymbolTable interface. It is used
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* during parsing to give UnicodeSet access to variables that
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* have been defined so far. Note that it uses variablesVector,
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* _not_ data.setVariables.
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*/
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class ParseData : public UMemory, public SymbolTable {
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public:
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const TransliterationRuleData* data; // alias
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const UVector* variablesVector; // alias
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ParseData(const TransliterationRuleData* data = 0,
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const UVector* variablesVector = 0);
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virtual const UnicodeString* lookup(const UnicodeString& s) const;
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virtual const UnicodeFunctor* lookupMatcher(UChar32 ch) const;
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virtual UnicodeString parseReference(const UnicodeString& text,
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ParsePosition& pos, int32_t limit) const;
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/**
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* Return true if the given character is a matcher standin or a plain
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* character (non standin).
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*/
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UBool isMatcher(UChar32 ch);
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/**
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* Return true if the given character is a replacer standin or a plain
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* character (non standin).
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*/
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UBool isReplacer(UChar32 ch);
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private:
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ParseData(const ParseData &other); // forbid copying of this class
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ParseData &operator=(const ParseData &other); // forbid copying of this class
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};
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ParseData::ParseData(const TransliterationRuleData* d,
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const UVector* sets) :
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data(d), variablesVector(sets) {}
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/**
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* Implement SymbolTable API.
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*/
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const UnicodeString* ParseData::lookup(const UnicodeString& name) const {
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return (const UnicodeString*) data->variableNames->get(name);
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}
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/**
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* Implement SymbolTable API.
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*/
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const UnicodeFunctor* ParseData::lookupMatcher(UChar32 ch) const {
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// Note that we cannot use data.lookupSet() because the
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// set array has not been constructed yet.
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const UnicodeFunctor* set = NULL;
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int32_t i = ch - data->variablesBase;
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if (i >= 0 && i < variablesVector->size()) {
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int32_t i = ch - data->variablesBase;
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set = (i < variablesVector->size()) ?
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(UnicodeFunctor*) variablesVector->elementAt(i) : 0;
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}
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return set;
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}
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/**
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* Implement SymbolTable API. Parse out a symbol reference
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* name.
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*/
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UnicodeString ParseData::parseReference(const UnicodeString& text,
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ParsePosition& pos, int32_t limit) const {
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int32_t start = pos.getIndex();
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int32_t i = start;
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UnicodeString result;
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while (i < limit) {
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UChar c = text.charAt(i);
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if ((i==start && !u_isIDStart(c)) || !u_isIDPart(c)) {
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break;
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}
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++i;
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}
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if (i == start) { // No valid name chars
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return result; // Indicate failure with empty string
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}
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pos.setIndex(i);
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text.extractBetween(start, i, result);
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return result;
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}
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UBool ParseData::isMatcher(UChar32 ch) {
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// Note that we cannot use data.lookup() because the
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// set array has not been constructed yet.
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int32_t i = ch - data->variablesBase;
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if (i >= 0 && i < variablesVector->size()) {
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UnicodeFunctor *f = (UnicodeFunctor*) variablesVector->elementAt(i);
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return f != NULL && f->toMatcher() != NULL;
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}
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return TRUE;
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}
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/**
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* Return true if the given character is a replacer standin or a plain
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* character (non standin).
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*/
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UBool ParseData::isReplacer(UChar32 ch) {
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// Note that we cannot use data.lookup() because the
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// set array has not been constructed yet.
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int i = ch - data->variablesBase;
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if (i >= 0 && i < variablesVector->size()) {
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UnicodeFunctor *f = (UnicodeFunctor*) variablesVector->elementAt(i);
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return f != NULL && f->toReplacer() != NULL;
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}
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return TRUE;
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}
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//----------------------------------------------------------------------
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// BEGIN RuleHalf
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//----------------------------------------------------------------------
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/**
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* A class representing one side of a rule. This class knows how to
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* parse half of a rule. It is tightly coupled to the method
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* RuleBasedTransliterator.Parser.parseRule().
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*/
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class RuleHalf : public UMemory {
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public:
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UnicodeString text;
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int32_t cursor; // position of cursor in text
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int32_t ante; // position of ante context marker '{' in text
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int32_t post; // position of post context marker '}' in text
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// Record the offset to the cursor either to the left or to the
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// right of the key. This is indicated by characters on the output
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// side that allow the cursor to be positioned arbitrarily within
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// the matching text. For example, abc{def} > | @@@ xyz; changes
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// def to xyz and moves the cursor to before abc. Offset characters
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// must be at the start or end, and they cannot move the cursor past
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// the ante- or postcontext text. Placeholders are only valid in
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// output text. The length of the ante and post context is
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// determined at runtime, because of supplementals and quantifiers.
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int32_t cursorOffset; // only nonzero on output side
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// Position of first CURSOR_OFFSET on _right_. This will be -1
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// for |@, -2 for |@@, etc., and 1 for @|, 2 for @@|, etc.
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int32_t cursorOffsetPos;
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UBool anchorStart;
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UBool anchorEnd;
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UErrorCode ec;
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/**
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* The segment number from 1..n of the next '(' we see
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* during parsing; 1-based.
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*/
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int32_t nextSegmentNumber;
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TransliteratorParser& parser;
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//--------------------------------------------------
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// Methods
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RuleHalf(TransliteratorParser& parser);
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~RuleHalf();
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int32_t parse(const UnicodeString& rule, int32_t pos, int32_t limit);
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int32_t parseSection(const UnicodeString& rule, int32_t pos, int32_t limit,
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UnicodeString& buf,
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const UnicodeString& illegal,
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UBool isSegment);
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/**
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* Remove context.
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*/
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void removeContext();
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/**
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* Return true if this half looks like valid output, that is, does not
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* contain quantifiers or other special input-only elements.
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*/
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UBool isValidOutput(TransliteratorParser& parser);
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/**
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* Return true if this half looks like valid input, that is, does not
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* contain functions or other special output-only elements.
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*/
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UBool isValidInput(TransliteratorParser& parser);
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int syntaxError(UErrorCode code,
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const UnicodeString& rule,
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int32_t start) {
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return parser.syntaxError(code, rule, start);
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}
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private:
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// Disallowed methods; no impl.
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RuleHalf(const RuleHalf&);
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RuleHalf& operator=(const RuleHalf&);
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};
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RuleHalf::RuleHalf(TransliteratorParser& p) :
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ec(U_ZERO_ERROR),
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parser(p)
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{
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cursor = -1;
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ante = -1;
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post = -1;
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cursorOffset = 0;
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cursorOffsetPos = 0;
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anchorStart = anchorEnd = FALSE;
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nextSegmentNumber = 1;
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}
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RuleHalf::~RuleHalf() {
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}
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/**
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* Parse one side of a rule, stopping at either the limit,
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* the END_OF_RULE character, or an operator.
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* @return the index after the terminating character, or
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* if limit was reached, limit
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*/
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int32_t RuleHalf::parse(const UnicodeString& rule, int32_t pos, int32_t limit) {
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int32_t start = pos;
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text.truncate(0);
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pos = parseSection(rule, pos, limit, text, ILLEGAL_TOP, FALSE);
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if (cursorOffset > 0 && cursor != cursorOffsetPos) {
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return syntaxError(U_MISPLACED_CURSOR_OFFSET, rule, start);
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}
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return pos;
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}
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/**
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* Parse a section of one side of a rule, stopping at either
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* the limit, the END_OF_RULE character, an operator, or a
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* segment close character. This method parses both a
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* top-level rule half and a segment within such a rule half.
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* It calls itself recursively to parse segments and nested
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* segments.
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* @param buf buffer into which to accumulate the rule pattern
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* characters, either literal characters from the rule or
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* standins for UnicodeMatcher objects including segments.
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* @param illegal the set of special characters that is illegal during
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* this parse.
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* @param isSegment if true, then we've already seen a '(' and
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* pos on entry points right after it. Accumulate everything
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* up to the closing ')', put it in a segment matcher object,
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* generate a standin for it, and add the standin to buf. As
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* a side effect, update the segments vector with a reference
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* to the segment matcher. This works recursively for nested
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* segments. If isSegment is false, just accumulate
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* characters into buf.
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* @return the index after the terminating character, or
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* if limit was reached, limit
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*/
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int32_t RuleHalf::parseSection(const UnicodeString& rule, int32_t pos, int32_t limit,
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UnicodeString& buf,
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const UnicodeString& illegal,
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UBool isSegment) {
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int32_t start = pos;
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ParsePosition pp;
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UnicodeString scratch;
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UBool done = FALSE;
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int32_t quoteStart = -1; // Most recent 'single quoted string'
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int32_t quoteLimit = -1;
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int32_t varStart = -1; // Most recent $variableReference
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int32_t varLimit = -1;
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int32_t bufStart = buf.length();
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while (pos < limit && !done) {
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// Since all syntax characters are in the BMP, fetching
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// 16-bit code units suffices here.
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UChar c = rule.charAt(pos++);
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if (uprv_isRuleWhiteSpace(c)) {
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// Ignore whitespace. Note that this is not Unicode
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// spaces, but Java spaces -- a subset, representing
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// whitespace likely to be seen in code.
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continue;
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}
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if (u_strchr(HALF_ENDERS, c) != NULL) {
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if (isSegment) {
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// Unclosed segment
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return syntaxError(U_UNCLOSED_SEGMENT, rule, start);
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}
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break;
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}
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if (anchorEnd) {
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// Text after a presumed end anchor is a syntax err
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return syntaxError(U_MALFORMED_VARIABLE_REFERENCE, rule, start);
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}
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if (UnicodeSet::resemblesPattern(rule, pos-1)) {
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pp.setIndex(pos-1); // Backup to opening '['
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buf.append(parser.parseSet(rule, pp));
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if (U_FAILURE(parser.status)) {
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return syntaxError(U_MALFORMED_SET, rule, start);
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}
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pos = pp.getIndex();
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continue;
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}
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// Handle escapes
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if (c == ESCAPE) {
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if (pos == limit) {
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return syntaxError(U_TRAILING_BACKSLASH, rule, start);
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}
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UChar32 escaped = rule.unescapeAt(pos); // pos is already past '\\'
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if (escaped == (UChar32) -1) {
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return syntaxError(U_MALFORMED_UNICODE_ESCAPE, rule, start);
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}
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if (!parser.checkVariableRange(escaped)) {
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return syntaxError(U_VARIABLE_RANGE_OVERLAP, rule, start);
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}
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buf.append(escaped);
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continue;
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}
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// Handle quoted matter
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if (c == QUOTE) {
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int32_t iq = rule.indexOf(QUOTE, pos);
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if (iq == pos) {
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buf.append(c); // Parse [''] outside quotes as [']
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++pos;
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} else {
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/* This loop picks up a run of quoted text of the
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* form 'aaaa' each time through. If this run
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* hasn't really ended ('aaaa''bbbb') then it keeps
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* looping, each time adding on a new run. When it
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* reaches the final quote it breaks.
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*/
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quoteStart = buf.length();
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for (;;) {
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if (iq < 0) {
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return syntaxError(U_UNTERMINATED_QUOTE, rule, start);
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}
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scratch.truncate(0);
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rule.extractBetween(pos, iq, scratch);
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buf.append(scratch);
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pos = iq+1;
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if (pos < limit && rule.charAt(pos) == QUOTE) {
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// Parse [''] inside quotes as [']
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iq = rule.indexOf(QUOTE, pos+1);
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// Continue looping
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} else {
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break;
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}
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}
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quoteLimit = buf.length();
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for (iq=quoteStart; iq<quoteLimit; ++iq) {
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if (!parser.checkVariableRange(buf.charAt(iq))) {
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return syntaxError(U_VARIABLE_RANGE_OVERLAP, rule, start);
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}
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}
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}
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continue;
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}
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if (!parser.checkVariableRange(c)) {
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return syntaxError(U_VARIABLE_RANGE_OVERLAP, rule, start);
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}
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if (illegal.indexOf(c) >= 0) {
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syntaxError(U_ILLEGAL_CHARACTER, rule, start);
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}
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switch (c) {
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//------------------------------------------------------
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// Elements allowed within and out of segments
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//------------------------------------------------------
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case ANCHOR_START:
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if (buf.length() == 0 && !anchorStart) {
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anchorStart = TRUE;
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} else {
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return syntaxError(U_MISPLACED_ANCHOR_START,
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rule, start);
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}
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break;
|
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case SEGMENT_OPEN:
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{
|
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// bufSegStart is the offset in buf to the first
|
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// character of the segment we are parsing.
|
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int32_t bufSegStart = buf.length();
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|
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// Record segment number now, since nextSegmentNumber
|
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// will be incremented during the call to parseSection
|
|
// if there are nested segments.
|
|
int32_t segmentNumber = nextSegmentNumber++; // 1-based
|
|
|
|
// Parse the segment
|
|
pos = parseSection(rule, pos, limit, buf, ILLEGAL_SEG, TRUE);
|
|
|
|
// After parsing a segment, the relevant characters are
|
|
// in buf, starting at offset bufSegStart. Extract them
|
|
// into a string matcher, and replace them with a
|
|
// standin for that matcher.
|
|
StringMatcher* m =
|
|
new StringMatcher(buf, bufSegStart, buf.length(),
|
|
segmentNumber, *parser.data);
|
|
|
|
// Record and associate object and segment number
|
|
parser.setSegmentObject(segmentNumber, m);
|
|
buf.truncate(bufSegStart);
|
|
buf.append(parser.getSegmentStandin(segmentNumber));
|
|
}
|
|
break;
|
|
case FUNCTION:
|
|
case ALT_FUNCTION:
|
|
{
|
|
int32_t iref = pos;
|
|
TransliteratorIDParser::SingleID* single =
|
|
TransliteratorIDParser::parseFilterID(rule, iref);
|
|
// The next character MUST be a segment open
|
|
if (single == NULL ||
|
|
!ICU_Utility::parseChar(rule, iref, SEGMENT_OPEN)) {
|
|
return syntaxError(U_INVALID_FUNCTION, rule, start);
|
|
}
|
|
|
|
Transliterator *t = single->createInstance();
|
|
delete single;
|
|
if (t == NULL) {
|
|
return syntaxError(U_INVALID_FUNCTION, rule, start);
|
|
}
|
|
|
|
// bufSegStart is the offset in buf to the first
|
|
// character of the segment we are parsing.
|
|
int32_t bufSegStart = buf.length();
|
|
|
|
// Parse the segment
|
|
pos = parseSection(rule, iref, limit, buf, ILLEGAL_FUNC, TRUE);
|
|
|
|
// After parsing a segment, the relevant characters are
|
|
// in buf, starting at offset bufSegStart.
|
|
UnicodeString output;
|
|
buf.extractBetween(bufSegStart, buf.length(), output);
|
|
FunctionReplacer *r =
|
|
new FunctionReplacer(t, new StringReplacer(output, parser.data));
|
|
|
|
// Replace the buffer contents with a stand-in
|
|
buf.truncate(bufSegStart);
|
|
buf.append(parser.generateStandInFor(r));
|
|
}
|
|
break;
|
|
case SymbolTable::SYMBOL_REF:
|
|
// Handle variable references and segment references "$1" .. "$9"
|
|
{
|
|
// A variable reference must be followed immediately
|
|
// by a Unicode identifier start and zero or more
|
|
// Unicode identifier part characters, or by a digit
|
|
// 1..9 if it is a segment reference.
|
|
if (pos == limit) {
|
|
// A variable ref character at the end acts as
|
|
// an anchor to the context limit, as in perl.
|
|
anchorEnd = TRUE;
|
|
break;
|
|
}
|
|
// Parse "$1" "$2" .. "$9" .. (no upper limit)
|
|
c = rule.charAt(pos);
|
|
int32_t r = u_digit(c, 10);
|
|
if (r >= 1 && r <= 9) {
|
|
r = ICU_Utility::parseNumber(rule, pos, 10);
|
|
if (r < 0) {
|
|
return syntaxError(U_UNDEFINED_SEGMENT_REFERENCE,
|
|
rule, start);
|
|
}
|
|
buf.append(parser.getSegmentStandin(r));
|
|
} else {
|
|
pp.setIndex(pos);
|
|
UnicodeString name = parser.parseData->
|
|
parseReference(rule, pp, limit);
|
|
if (name.length() == 0) {
|
|
// This means the '$' was not followed by a
|
|
// valid name. Try to interpret it as an
|
|
// end anchor then. If this also doesn't work
|
|
// (if we see a following character) then signal
|
|
// an error.
|
|
anchorEnd = TRUE;
|
|
break;
|
|
}
|
|
pos = pp.getIndex();
|
|
// If this is a variable definition statement,
|
|
// then the LHS variable will be undefined. In
|
|
// that case appendVariableDef() will append the
|
|
// special placeholder char variableLimit-1.
|
|
varStart = buf.length();
|
|
parser.appendVariableDef(name, buf);
|
|
varLimit = buf.length();
|
|
}
|
|
}
|
|
break;
|
|
case DOT:
|
|
buf.append(parser.getDotStandIn());
|
|
break;
|
|
case KLEENE_STAR:
|
|
case ONE_OR_MORE:
|
|
case ZERO_OR_ONE:
|
|
// Quantifiers. We handle single characters, quoted strings,
|
|
// variable references, and segments.
|
|
// a+ matches aaa
|
|
// 'foo'+ matches foofoofoo
|
|
// $v+ matches xyxyxy if $v == xy
|
|
// (seg)+ matches segsegseg
|
|
{
|
|
if (isSegment && buf.length() == bufStart) {
|
|
// The */+ immediately follows '('
|
|
return syntaxError(U_MISPLACED_QUANTIFIER, rule, start);
|
|
}
|
|
|
|
int32_t qstart, qlimit;
|
|
// The */+ follows an isolated character or quote
|
|
// or variable reference
|
|
if (buf.length() == quoteLimit) {
|
|
// The */+ follows a 'quoted string'
|
|
qstart = quoteStart;
|
|
qlimit = quoteLimit;
|
|
} else if (buf.length() == varLimit) {
|
|
// The */+ follows a $variableReference
|
|
qstart = varStart;
|
|
qlimit = varLimit;
|
|
} else {
|
|
// The */+ follows a single character, possibly
|
|
// a segment standin
|
|
qstart = buf.length() - 1;
|
|
qlimit = qstart + 1;
|
|
}
|
|
|
|
UnicodeFunctor *m =
|
|
new StringMatcher(buf, qstart, qlimit, 0, *parser.data);
|
|
int32_t min = 0;
|
|
int32_t max = Quantifier::MAX;
|
|
switch (c) {
|
|
case ONE_OR_MORE:
|
|
min = 1;
|
|
break;
|
|
case ZERO_OR_ONE:
|
|
min = 0;
|
|
max = 1;
|
|
break;
|
|
// case KLEENE_STAR:
|
|
// do nothing -- min, max already set
|
|
}
|
|
m = new Quantifier(m, min, max);
|
|
buf.truncate(qstart);
|
|
buf.append(parser.generateStandInFor(m));
|
|
}
|
|
break;
|
|
|
|
//------------------------------------------------------
|
|
// Elements allowed ONLY WITHIN segments
|
|
//------------------------------------------------------
|
|
case SEGMENT_CLOSE:
|
|
// assert(isSegment);
|
|
// We're done parsing a segment.
|
|
done = TRUE;
|
|
break;
|
|
|
|
//------------------------------------------------------
|
|
// Elements allowed ONLY OUTSIDE segments
|
|
//------------------------------------------------------
|
|
case CONTEXT_ANTE:
|
|
if (ante >= 0) {
|
|
return syntaxError(U_MULTIPLE_ANTE_CONTEXTS, rule, start);
|
|
}
|
|
ante = buf.length();
|
|
break;
|
|
case CONTEXT_POST:
|
|
if (post >= 0) {
|
|
return syntaxError(U_MULTIPLE_POST_CONTEXTS, rule, start);
|
|
}
|
|
post = buf.length();
|
|
break;
|
|
case CURSOR_POS:
|
|
if (cursor >= 0) {
|
|
return syntaxError(U_MULTIPLE_CURSORS, rule, start);
|
|
}
|
|
cursor = buf.length();
|
|
break;
|
|
case CURSOR_OFFSET:
|
|
if (cursorOffset < 0) {
|
|
if (buf.length() > 0) {
|
|
return syntaxError(U_MISPLACED_CURSOR_OFFSET, rule, start);
|
|
}
|
|
--cursorOffset;
|
|
} else if (cursorOffset > 0) {
|
|
if (buf.length() != cursorOffsetPos || cursor >= 0) {
|
|
return syntaxError(U_MISPLACED_CURSOR_OFFSET, rule, start);
|
|
}
|
|
++cursorOffset;
|
|
} else {
|
|
if (cursor == 0 && buf.length() == 0) {
|
|
cursorOffset = -1;
|
|
} else if (cursor < 0) {
|
|
cursorOffsetPos = buf.length();
|
|
cursorOffset = 1;
|
|
} else {
|
|
return syntaxError(U_MISPLACED_CURSOR_OFFSET, rule, start);
|
|
}
|
|
}
|
|
break;
|
|
|
|
|
|
//------------------------------------------------------
|
|
// Non-special characters
|
|
//------------------------------------------------------
|
|
default:
|
|
// Disallow unquoted characters other than [0-9A-Za-z]
|
|
// in the printable ASCII range. These characters are
|
|
// reserved for possible future use.
|
|
if (c >= 0x0021 && c <= 0x007E &&
|
|
!((c >= 0x0030/*'0'*/ && c <= 0x0039/*'9'*/) ||
|
|
(c >= 0x0041/*'A'*/ && c <= 0x005A/*'Z'*/) ||
|
|
(c >= 0x0061/*'a'*/ && c <= 0x007A/*'z'*/))) {
|
|
return syntaxError(U_UNQUOTED_SPECIAL, rule, start);
|
|
}
|
|
buf.append(c);
|
|
break;
|
|
}
|
|
}
|
|
|
|
return pos;
|
|
}
|
|
|
|
/**
|
|
* Remove context.
|
|
*/
|
|
void RuleHalf::removeContext() {
|
|
//text = text.substring(ante < 0 ? 0 : ante,
|
|
// post < 0 ? text.length() : post);
|
|
if (post >= 0) {
|
|
text.remove(post);
|
|
}
|
|
if (ante >= 0) {
|
|
text.removeBetween(0, ante);
|
|
}
|
|
ante = post = -1;
|
|
anchorStart = anchorEnd = FALSE;
|
|
}
|
|
|
|
/**
|
|
* Return true if this half looks like valid output, that is, does not
|
|
* contain quantifiers or other special input-only elements.
|
|
*/
|
|
UBool RuleHalf::isValidOutput(TransliteratorParser& transParser) {
|
|
for (int32_t i=0; i<text.length(); ) {
|
|
UChar32 c = text.char32At(i);
|
|
i += UTF_CHAR_LENGTH(c);
|
|
if (!transParser.parseData->isReplacer(c)) {
|
|
return FALSE;
|
|
}
|
|
}
|
|
return TRUE;
|
|
}
|
|
|
|
/**
|
|
* Return true if this half looks like valid input, that is, does not
|
|
* contain functions or other special output-only elements.
|
|
*/
|
|
UBool RuleHalf::isValidInput(TransliteratorParser& transParser) {
|
|
for (int32_t i=0; i<text.length(); ) {
|
|
UChar32 c = text.char32At(i);
|
|
i += UTF_CHAR_LENGTH(c);
|
|
if (!transParser.parseData->isMatcher(c)) {
|
|
return FALSE;
|
|
}
|
|
}
|
|
return TRUE;
|
|
}
|
|
|
|
//----------------------------------------------------------------------
|
|
// PUBLIC API
|
|
//----------------------------------------------------------------------
|
|
|
|
/**
|
|
* Constructor.
|
|
*/
|
|
TransliteratorParser::TransliteratorParser() {
|
|
data = NULL;
|
|
compoundFilter = NULL;
|
|
parseData = NULL;
|
|
variablesVector = NULL;
|
|
segmentObjects = NULL;
|
|
}
|
|
|
|
/**
|
|
* Destructor.
|
|
*/
|
|
TransliteratorParser::~TransliteratorParser() {
|
|
delete data;
|
|
delete compoundFilter;
|
|
delete parseData;
|
|
delete variablesVector;
|
|
delete segmentObjects;
|
|
}
|
|
|
|
void
|
|
TransliteratorParser::parse(const UnicodeString& rules,
|
|
UTransDirection transDirection,
|
|
UParseError& pe,
|
|
UErrorCode& ec) {
|
|
if (U_SUCCESS(ec)) {
|
|
parseRules(rules, transDirection);
|
|
pe = parseError;
|
|
ec = status;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Return the compound filter parsed by parse(). Caller owns result.
|
|
*/
|
|
UnicodeSet* TransliteratorParser::orphanCompoundFilter() {
|
|
UnicodeSet* f = compoundFilter;
|
|
compoundFilter = NULL;
|
|
return f;
|
|
}
|
|
|
|
/**
|
|
* Return the data object parsed by parse(). Caller owns result.
|
|
*/
|
|
TransliterationRuleData* TransliteratorParser::orphanData() {
|
|
TransliterationRuleData* d = data;
|
|
data = NULL;
|
|
return d;
|
|
}
|
|
|
|
//----------------------------------------------------------------------
|
|
// Private implementation
|
|
//----------------------------------------------------------------------
|
|
|
|
/**
|
|
* Parse the given string as a sequence of rules, separated by newline
|
|
* characters ('\n'), and cause this object to implement those rules. Any
|
|
* previous rules are discarded. Typically this method is called exactly
|
|
* once, during construction.
|
|
* @exception IllegalArgumentException if there is a syntax error in the
|
|
* rules
|
|
*/
|
|
void TransliteratorParser::parseRules(const UnicodeString& rule,
|
|
UTransDirection theDirection) {
|
|
// Clear error struct
|
|
parseError.line = parseError.offset = -1;
|
|
parseError.preContext[0] = parseError.postContext[0] = (UChar)0;
|
|
status = U_ZERO_ERROR;
|
|
|
|
delete data;
|
|
data = new TransliterationRuleData(status);
|
|
if (U_FAILURE(status)) {
|
|
return;
|
|
}
|
|
|
|
direction = theDirection;
|
|
ruleCount = 0;
|
|
|
|
delete compoundFilter;
|
|
compoundFilter = NULL;
|
|
|
|
if (variablesVector == NULL) {
|
|
variablesVector = new UVector(status);
|
|
} else {
|
|
variablesVector->removeAllElements();
|
|
}
|
|
parseData = new ParseData(0, variablesVector);
|
|
if (parseData == NULL) {
|
|
status = U_MEMORY_ALLOCATION_ERROR;
|
|
return;
|
|
}
|
|
parseData->data = data;
|
|
|
|
// By default, rules use part of the private use area
|
|
// E000..F8FF for variables and other stand-ins. Currently
|
|
// the range F000..F8FF is typically sufficient. The 'use
|
|
// variable range' pragma allows rule sets to modify this.
|
|
setVariableRange(0xF000, 0xF8FF);
|
|
|
|
dotStandIn = (UChar) -1;
|
|
|
|
UnicodeString str; // scratch
|
|
idBlock.truncate(0);
|
|
idSplitPoint = -1;
|
|
int32_t pos = 0;
|
|
int32_t limit = rule.length();
|
|
// The mode marks whether we are in the header ::id block, the
|
|
// rule block, or the footer ::id block.
|
|
// mode == 0: start: rule->1, ::id->0
|
|
// mode == 1: in rules: rule->1, ::id->2
|
|
// mode == 2: in footer rule block: rule->ERROR, ::id->2
|
|
int32_t mode = 0;
|
|
|
|
// The compound filter offset is an index into idBlockResult.
|
|
// If it is 0, then the compound filter occurred at the start,
|
|
// and it is the offset to the _start_ of the compound filter
|
|
// pattern. Otherwise it is the offset to the _limit_ of the
|
|
// compound filter pattern within idBlockResult.
|
|
compoundFilter = NULL;
|
|
int32_t compoundFilterOffset = -1;
|
|
|
|
// The number of ::ID block entries we have parsed
|
|
int32_t idBlockCount = 0;
|
|
|
|
while (pos < limit && U_SUCCESS(status)) {
|
|
UChar c = rule.charAt(pos++);
|
|
if (uprv_isRuleWhiteSpace(c)) {
|
|
// Ignore leading whitespace.
|
|
continue;
|
|
}
|
|
// Skip lines starting with the comment character
|
|
if (c == RULE_COMMENT_CHAR) {
|
|
pos = rule.indexOf((UChar)0x000A /*\n*/, pos) + 1;
|
|
if (pos == 0) {
|
|
break; // No "\n" found; rest of rule is a commnet
|
|
}
|
|
continue; // Either fall out or restart with next line
|
|
}
|
|
// We've found the start of a rule or ID. c is its first
|
|
// character, and pos points past c.
|
|
--pos;
|
|
// Look for an ID token. Must have at least ID_TOKEN_LEN + 1
|
|
// chars left.
|
|
if ((pos + ID_TOKEN_LEN + 1) <= limit &&
|
|
rule.compare(pos, ID_TOKEN_LEN, ID_TOKEN) == 0) {
|
|
pos += ID_TOKEN_LEN;
|
|
c = rule.charAt(pos);
|
|
while (uprv_isRuleWhiteSpace(c) && pos < limit) {
|
|
++pos;
|
|
c = rule.charAt(pos);
|
|
}
|
|
|
|
if (mode == 1) {
|
|
// We have just entered the footer ::ID block
|
|
mode = 2;
|
|
// In the forward direction add elements at the end.
|
|
// In the reverse direction add elements at the start.
|
|
idSplitPoint = idBlockCount;
|
|
}
|
|
int32_t p = pos;
|
|
|
|
TransliteratorIDParser::SingleID* id =
|
|
TransliteratorIDParser::parseSingleID(rule, p, direction);
|
|
if (p != pos && ICU_Utility::parseChar(rule, p, END_OF_RULE)) {
|
|
// Successful ::ID parse.
|
|
|
|
if (direction == UTRANS_FORWARD) {
|
|
idBlock.append(id->canonID).append(END_OF_RULE);
|
|
} else {
|
|
idBlock.insert(0, END_OF_RULE);
|
|
idBlock.insert(0, id->canonID);
|
|
}
|
|
|
|
++idBlockCount;
|
|
|
|
} else {
|
|
// Couldn't parse an ID. Try to parse a global filter
|
|
int32_t withParens = -1;
|
|
UnicodeSet* f = TransliteratorIDParser::parseGlobalFilter(rule, p, direction, withParens, &idBlock);
|
|
if (f != NULL) {
|
|
if (ICU_Utility::parseChar(rule, p, END_OF_RULE)
|
|
&& (direction == UTRANS_FORWARD) == (withParens == 0))
|
|
{
|
|
if (compoundFilter != NULL) {
|
|
// Multiple compound filters
|
|
syntaxError(U_MULTIPLE_COMPOUND_FILTERS, rule, pos);
|
|
delete f;
|
|
} else {
|
|
compoundFilter = f;
|
|
compoundFilterOffset = idBlockCount;
|
|
}
|
|
} else {
|
|
delete f;
|
|
}
|
|
} else {
|
|
// Invalid ::id
|
|
// Can be parsed as neither an ID nor a global filter
|
|
syntaxError(U_INVALID_ID, rule, pos);
|
|
}
|
|
}
|
|
delete id;
|
|
|
|
pos = p;
|
|
} else if (resemblesPragma(rule, pos, limit)) {
|
|
int32_t ppp = parsePragma(rule, pos, limit);
|
|
if (ppp < 0) {
|
|
syntaxError(U_MALFORMED_PRAGMA, rule, pos);
|
|
}
|
|
pos = ppp;
|
|
} else {
|
|
// Parse a rule
|
|
pos = parseRule(rule, pos, limit);
|
|
if (U_SUCCESS(status)) {
|
|
++ruleCount;
|
|
if (mode == 2) {
|
|
// ::id in illegal position (because a rule
|
|
// occurred after the ::id footer block)
|
|
syntaxError(U_ILLEGAL_ARGUMENT_ERROR,rule,pos);
|
|
}
|
|
}else{
|
|
syntaxError(status,rule,pos);
|
|
}
|
|
mode = 1;
|
|
}
|
|
}
|
|
|
|
if (idSplitPoint < 0) {
|
|
idSplitPoint = idBlockCount;
|
|
}
|
|
|
|
if (direction == UTRANS_REVERSE) {
|
|
idSplitPoint = idBlockCount - idSplitPoint;
|
|
}
|
|
|
|
// Convert the set vector to an array
|
|
data->variablesLength = variablesVector->size();
|
|
if(data->variablesLength == 0) {
|
|
data->variables = 0;
|
|
} else {
|
|
data->variables = (UnicodeFunctor **)uprv_malloc(data->variablesLength * sizeof(UnicodeFunctor *));
|
|
}
|
|
|
|
// orphanElement removes the given element and shifts all other
|
|
// elements down. For performance (and code clarity) we work from
|
|
// the end back to index 0.
|
|
int32_t i;
|
|
for (i=data->variablesLength; i>0; ) {
|
|
--i;
|
|
data->variables[i] =
|
|
(UnicodeSet*) variablesVector->orphanElementAt(i);
|
|
}
|
|
|
|
// Index the rules
|
|
if (U_SUCCESS(status)) {
|
|
if (compoundFilter != NULL) {
|
|
if ((direction == UTRANS_FORWARD &&
|
|
compoundFilterOffset != 0) ||
|
|
(direction == UTRANS_REVERSE &&
|
|
compoundFilterOffset != idBlockCount)) {
|
|
status = U_MISPLACED_COMPOUND_FILTER;
|
|
}
|
|
}
|
|
|
|
data->ruleSet.freeze(parseError,status);
|
|
|
|
if (idSplitPoint < 0) {
|
|
idSplitPoint = idBlock.length();
|
|
}
|
|
|
|
if (ruleCount == 0) {
|
|
delete data;
|
|
data = NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Set the variable range to [start, end] (inclusive).
|
|
*/
|
|
void TransliteratorParser::setVariableRange(int32_t start, int32_t end) {
|
|
if (start > end || start < 0 || end > 0xFFFF) {
|
|
status = U_MALFORMED_PRAGMA;
|
|
return;
|
|
}
|
|
|
|
data->variablesBase = variableNext = (UChar) start; // first private use
|
|
variableLimit = (UChar) (end + 1);
|
|
}
|
|
|
|
/**
|
|
* Assert that the given character is NOT within the variable range.
|
|
* If it is, return FALSE. This is neccesary to ensure that the
|
|
* variable range does not overlap characters used in a rule.
|
|
*/
|
|
UBool TransliteratorParser::checkVariableRange(UChar32 ch) const {
|
|
return !(ch >= data->variablesBase && ch < variableLimit);
|
|
}
|
|
|
|
/**
|
|
* Set the maximum backup to 'backup', in response to a pragma
|
|
* statement.
|
|
*/
|
|
void TransliteratorParser::pragmaMaximumBackup(int32_t backup) {
|
|
//TODO Finish
|
|
}
|
|
|
|
/**
|
|
* Begin normalizing all rules using the given mode, in response
|
|
* to a pragma statement.
|
|
*/
|
|
void TransliteratorParser::pragmaNormalizeRules(UNormalizationMode mode) {
|
|
//TODO Finish
|
|
}
|
|
|
|
static const UChar PRAGMA_USE[] = {0x75,0x73,0x65,0x20,0}; // "use "
|
|
|
|
static const UChar PRAGMA_VARIABLE_RANGE[] = {0x7E,0x76,0x61,0x72,0x69,0x61,0x62,0x6C,0x65,0x20,0x72,0x61,0x6E,0x67,0x65,0x20,0x23,0x20,0x23,0x7E,0x3B,0}; // "~variable range # #~;"
|
|
|
|
static const UChar PRAGMA_MAXIMUM_BACKUP[] = {0x7E,0x6D,0x61,0x78,0x69,0x6D,0x75,0x6D,0x20,0x62,0x61,0x63,0x6B,0x75,0x70,0x20,0x23,0x7E,0x3B,0}; // "~maximum backup #~;"
|
|
|
|
static const UChar PRAGMA_NFD_RULES[] = {0x7E,0x6E,0x66,0x64,0x20,0x72,0x75,0x6C,0x65,0x73,0x7E,0x3B,0}; // "~nfd rules~;"
|
|
|
|
static const UChar PRAGMA_NFC_RULES[] = {0x7E,0x6E,0x66,0x63,0x20,0x72,0x75,0x6C,0x65,0x73,0x7E,0x3B,0}; // "~nfc rules~;"
|
|
|
|
/**
|
|
* Return true if the given rule looks like a pragma.
|
|
* @param pos offset to the first non-whitespace character
|
|
* of the rule.
|
|
* @param limit pointer past the last character of the rule.
|
|
*/
|
|
UBool TransliteratorParser::resemblesPragma(const UnicodeString& rule, int32_t pos, int32_t limit) {
|
|
// Must start with /use\s/i
|
|
return ICU_Utility::parsePattern(rule, pos, limit, PRAGMA_USE, NULL) >= 0;
|
|
}
|
|
|
|
/**
|
|
* Parse a pragma. This method assumes resemblesPragma() has
|
|
* already returned true.
|
|
* @param pos offset to the first non-whitespace character
|
|
* of the rule.
|
|
* @param limit pointer past the last character of the rule.
|
|
* @return the position index after the final ';' of the pragma,
|
|
* or -1 on failure.
|
|
*/
|
|
int32_t TransliteratorParser::parsePragma(const UnicodeString& rule, int32_t pos, int32_t limit) {
|
|
int32_t array[2];
|
|
|
|
// resemblesPragma() has already returned true, so we
|
|
// know that pos points to /use\s/i; we can skip 4 characters
|
|
// immediately
|
|
pos += 4;
|
|
|
|
// Here are the pragmas we recognize:
|
|
// use variable range 0xE000 0xEFFF;
|
|
// use maximum backup 16;
|
|
// use nfd rules;
|
|
// use nfc rules;
|
|
int p = ICU_Utility::parsePattern(rule, pos, limit, PRAGMA_VARIABLE_RANGE, array);
|
|
if (p >= 0) {
|
|
setVariableRange(array[0], array[1]);
|
|
return p;
|
|
}
|
|
|
|
p = ICU_Utility::parsePattern(rule, pos, limit, PRAGMA_MAXIMUM_BACKUP, array);
|
|
if (p >= 0) {
|
|
pragmaMaximumBackup(array[0]);
|
|
return p;
|
|
}
|
|
|
|
p = ICU_Utility::parsePattern(rule, pos, limit, PRAGMA_NFD_RULES, NULL);
|
|
if (p >= 0) {
|
|
pragmaNormalizeRules(UNORM_NFD);
|
|
return p;
|
|
}
|
|
|
|
p = ICU_Utility::parsePattern(rule, pos, limit, PRAGMA_NFC_RULES, NULL);
|
|
if (p >= 0) {
|
|
pragmaNormalizeRules(UNORM_NFC);
|
|
return p;
|
|
}
|
|
|
|
// Syntax error: unable to parse pragma
|
|
return -1;
|
|
}
|
|
|
|
/**
|
|
* MAIN PARSER. Parse the next rule in the given rule string, starting
|
|
* at pos. Return the index after the last character parsed. Do not
|
|
* parse characters at or after limit.
|
|
*
|
|
* Important: The character at pos must be a non-whitespace character
|
|
* that is not the comment character.
|
|
*
|
|
* This method handles quoting, escaping, and whitespace removal. It
|
|
* parses the end-of-rule character. It recognizes context and cursor
|
|
* indicators. Once it does a lexical breakdown of the rule at pos, it
|
|
* creates a rule object and adds it to our rule list.
|
|
*/
|
|
int32_t TransliteratorParser::parseRule(const UnicodeString& rule, int32_t pos, int32_t limit) {
|
|
// Locate the left side, operator, and right side
|
|
int32_t start = pos;
|
|
UChar op = 0;
|
|
int32_t i;
|
|
|
|
// Set up segments data
|
|
segmentStandins.truncate(0);
|
|
if (segmentObjects == NULL) {
|
|
segmentObjects = new UVector(status);
|
|
} else {
|
|
segmentObjects->removeAllElements();
|
|
}
|
|
|
|
// Use pointers to automatics to make swapping possible.
|
|
RuleHalf _left(*this), _right(*this);
|
|
RuleHalf* left = &_left;
|
|
RuleHalf* right = &_right;
|
|
|
|
undefinedVariableName.remove();
|
|
pos = left->parse(rule, pos, limit);
|
|
if (U_FAILURE(status)) {
|
|
return start;
|
|
}
|
|
|
|
if (pos == limit || u_strchr(gOPERATORS, (op = rule.charAt(--pos))) == NULL) {
|
|
return syntaxError(U_MISSING_OPERATOR, rule, start);
|
|
}
|
|
++pos;
|
|
|
|
// Found an operator char. Check for forward-reverse operator.
|
|
if (op == REVERSE_RULE_OP &&
|
|
(pos < limit && rule.charAt(pos) == FORWARD_RULE_OP)) {
|
|
++pos;
|
|
op = FWDREV_RULE_OP;
|
|
}
|
|
|
|
// Translate alternate op characters.
|
|
switch (op) {
|
|
case ALT_FORWARD_RULE_OP:
|
|
op = FORWARD_RULE_OP;
|
|
break;
|
|
case ALT_REVERSE_RULE_OP:
|
|
op = REVERSE_RULE_OP;
|
|
break;
|
|
case ALT_FWDREV_RULE_OP:
|
|
op = FWDREV_RULE_OP;
|
|
break;
|
|
}
|
|
|
|
pos = right->parse(rule, pos, limit);
|
|
if (U_FAILURE(status)) {
|
|
return start;
|
|
}
|
|
|
|
if (pos < limit) {
|
|
if (rule.charAt(--pos) == END_OF_RULE) {
|
|
++pos;
|
|
} else {
|
|
// RuleHalf parser must have terminated at an operator
|
|
return syntaxError(U_UNQUOTED_SPECIAL, rule, start);
|
|
}
|
|
}
|
|
|
|
if (op == VARIABLE_DEF_OP) {
|
|
// LHS is the name. RHS is a single character, either a literal
|
|
// or a set (already parsed). If RHS is longer than one
|
|
// character, it is either a multi-character string, or multiple
|
|
// sets, or a mixture of chars and sets -- syntax error.
|
|
|
|
// We expect to see a single undefined variable (the one being
|
|
// defined).
|
|
if (undefinedVariableName.length() == 0) {
|
|
// "Missing '$' or duplicate definition"
|
|
return syntaxError(U_BAD_VARIABLE_DEFINITION, rule, start);
|
|
}
|
|
if (left->text.length() != 1 || left->text.charAt(0) != variableLimit) {
|
|
// "Malformed LHS"
|
|
return syntaxError(U_MALFORMED_VARIABLE_DEFINITION, rule, start);
|
|
}
|
|
if (left->anchorStart || left->anchorEnd ||
|
|
right->anchorStart || right->anchorEnd) {
|
|
return syntaxError(U_MALFORMED_VARIABLE_DEFINITION, rule, start);
|
|
}
|
|
// We allow anything on the right, including an empty string.
|
|
UnicodeString* value = new UnicodeString(right->text);
|
|
data->variableNames->put(undefinedVariableName, value, status);
|
|
++variableLimit;
|
|
return pos;
|
|
}
|
|
|
|
// If this is not a variable definition rule, we shouldn't have
|
|
// any undefined variable names.
|
|
if (undefinedVariableName.length() != 0) {
|
|
return syntaxError(// "Undefined variable $" + undefinedVariableName,
|
|
U_UNDEFINED_VARIABLE,
|
|
rule, start);
|
|
}
|
|
|
|
// Verify segments
|
|
if (segmentStandins.length() > segmentObjects->size()) {
|
|
syntaxError(U_UNDEFINED_SEGMENT_REFERENCE, rule, start);
|
|
}
|
|
for (i=0; i<segmentStandins.length(); ++i) {
|
|
if (segmentStandins.charAt(i) == 0) {
|
|
syntaxError(U_INTERNAL_TRANSLITERATOR_ERROR, rule, start); // will never happen
|
|
}
|
|
}
|
|
for (i=0; i<segmentObjects->size(); ++i) {
|
|
if (segmentObjects->elementAt(i) == NULL) {
|
|
syntaxError(U_INTERNAL_TRANSLITERATOR_ERROR, rule, start); // will never happen
|
|
}
|
|
}
|
|
|
|
// If the direction we want doesn't match the rule
|
|
// direction, do nothing.
|
|
if (op != FWDREV_RULE_OP &&
|
|
((direction == UTRANS_FORWARD) != (op == FORWARD_RULE_OP))) {
|
|
return pos;
|
|
}
|
|
|
|
// Transform the rule into a forward rule by swapping the
|
|
// sides if necessary.
|
|
if (direction == UTRANS_REVERSE) {
|
|
left = &_right;
|
|
right = &_left;
|
|
}
|
|
|
|
// Remove non-applicable elements in forward-reverse
|
|
// rules. Bidirectional rules ignore elements that do not
|
|
// apply.
|
|
if (op == FWDREV_RULE_OP) {
|
|
right->removeContext();
|
|
left->cursor = -1;
|
|
left->cursorOffset = 0;
|
|
}
|
|
|
|
// Normalize context
|
|
if (left->ante < 0) {
|
|
left->ante = 0;
|
|
}
|
|
if (left->post < 0) {
|
|
left->post = left->text.length();
|
|
}
|
|
|
|
// Context is only allowed on the input side. Cursors are only
|
|
// allowed on the output side. Segment delimiters can only appear
|
|
// on the left, and references on the right. Cursor offset
|
|
// cannot appear without an explicit cursor. Cursor offset
|
|
// cannot place the cursor outside the limits of the context.
|
|
// Anchors are only allowed on the input side.
|
|
if (right->ante >= 0 || right->post >= 0 || left->cursor >= 0 ||
|
|
(right->cursorOffset != 0 && right->cursor < 0) ||
|
|
// - The following two checks were used to ensure that the
|
|
// - the cursor offset stayed within the ante- or postcontext.
|
|
// - However, with the addition of quantifiers, we have to
|
|
// - allow arbitrary cursor offsets and do runtime checking.
|
|
//(right->cursorOffset > (left->text.length() - left->post)) ||
|
|
//(-right->cursorOffset > left->ante) ||
|
|
right->anchorStart || right->anchorEnd ||
|
|
!left->isValidInput(*this) || !right->isValidOutput(*this) ||
|
|
left->ante > left->post) {
|
|
|
|
return syntaxError(U_MALFORMED_RULE, rule, start);
|
|
}
|
|
|
|
// Flatten segment objects vector to an array
|
|
UnicodeFunctor** segmentsArray = NULL;
|
|
if (segmentObjects->size() > 0) {
|
|
segmentsArray = (UnicodeFunctor **)uprv_malloc(segmentObjects->size() * sizeof(UnicodeFunctor *));
|
|
segmentObjects->toArray((void**) segmentsArray);
|
|
}
|
|
|
|
data->ruleSet.addRule(new TransliterationRule(
|
|
left->text, left->ante, left->post,
|
|
right->text, right->cursor, right->cursorOffset,
|
|
segmentsArray,
|
|
segmentObjects->size(),
|
|
left->anchorStart, left->anchorEnd,
|
|
data,
|
|
status), status);
|
|
|
|
return pos;
|
|
}
|
|
|
|
/**
|
|
* Called by main parser upon syntax error. Search the rule string
|
|
* for the probable end of the rule. Of course, if the error is that
|
|
* the end of rule marker is missing, then the rule end will not be found.
|
|
* In any case the rule start will be correctly reported.
|
|
* @param msg error description
|
|
* @param rule pattern string
|
|
* @param start position of first character of current rule
|
|
*/
|
|
int32_t TransliteratorParser::syntaxError(UErrorCode parseErrorCode,
|
|
const UnicodeString& rule,
|
|
int32_t pos) {
|
|
parseError.offset = pos;
|
|
parseError.line = 0 ; /* we are not using line numbers */
|
|
|
|
// for pre-context
|
|
const int32_t LEN = U_PARSE_CONTEXT_LEN - 1;
|
|
int32_t start = uprv_max(pos - LEN, 0);
|
|
int32_t stop = pos;
|
|
|
|
rule.extract(start,stop-start,parseError.preContext);
|
|
//null terminate the buffer
|
|
parseError.preContext[stop-start] = 0;
|
|
|
|
//for post-context
|
|
start = pos;
|
|
stop = uprv_min(pos + LEN, rule.length());
|
|
|
|
rule.extract(start,stop-start,parseError.postContext);
|
|
//null terminate the buffer
|
|
parseError.postContext[stop-start]= 0;
|
|
|
|
status = (UErrorCode)parseErrorCode;
|
|
return pos;
|
|
|
|
}
|
|
|
|
/**
|
|
* Parse a UnicodeSet out, store it, and return the stand-in character
|
|
* used to represent it.
|
|
*/
|
|
UChar TransliteratorParser::parseSet(const UnicodeString& rule,
|
|
ParsePosition& pos) {
|
|
UnicodeSet* set = new UnicodeSet(rule, pos, *parseData, status);
|
|
set->compact();
|
|
return generateStandInFor(set);
|
|
}
|
|
|
|
/**
|
|
* Generate and return a stand-in for a new UnicodeFunctor. Store
|
|
* the matcher (adopt it).
|
|
*/
|
|
UChar TransliteratorParser::generateStandInFor(UnicodeFunctor* adopted) {
|
|
// assert(obj != null);
|
|
|
|
// Look up previous stand-in, if any. This is a short list
|
|
// (typical n is 0, 1, or 2); linear search is optimal.
|
|
for (int32_t i=0; i<variablesVector->size(); ++i) {
|
|
if (variablesVector->elementAt(i) == adopted) { // [sic] pointer comparison
|
|
return (UChar) (data->variablesBase + i);
|
|
}
|
|
}
|
|
|
|
if (variableNext >= variableLimit) {
|
|
delete adopted;
|
|
status = U_VARIABLE_RANGE_EXHAUSTED;
|
|
return 0;
|
|
}
|
|
variablesVector->addElement(adopted, status);
|
|
return variableNext++;
|
|
}
|
|
|
|
/**
|
|
* Return the standin for segment seg (1-based).
|
|
*/
|
|
UChar TransliteratorParser::getSegmentStandin(int32_t seg) {
|
|
// Special character used to indicate an empty spot
|
|
UChar empty = data->variablesBase - 1;
|
|
while (segmentStandins.length() < seg) {
|
|
segmentStandins.append(empty);
|
|
}
|
|
UChar c = segmentStandins.charAt(seg-1);
|
|
if (c == empty) {
|
|
if (variableNext >= variableLimit) {
|
|
status = U_VARIABLE_RANGE_EXHAUSTED;
|
|
return 0;
|
|
}
|
|
c = variableNext++;
|
|
// Set a placeholder in the master variables vector that will be
|
|
// filled in later by setSegmentObject(). We know that we will get
|
|
// called first because setSegmentObject() will call us.
|
|
variablesVector->addElement((void*) NULL, status);
|
|
segmentStandins.setCharAt(seg-1, c);
|
|
}
|
|
return c;
|
|
}
|
|
|
|
/**
|
|
* Set the object for segment seg (1-based).
|
|
*/
|
|
void TransliteratorParser::setSegmentObject(int32_t seg, StringMatcher* adopted) {
|
|
// Since we call parseSection() recursively, nested
|
|
// segments will result in segment i+1 getting parsed
|
|
// and stored before segment i; be careful with the
|
|
// vector handling here.
|
|
if (segmentObjects->size() < seg) {
|
|
segmentObjects->setSize(seg);
|
|
}
|
|
int32_t index = getSegmentStandin(seg) - data->variablesBase;
|
|
if (segmentObjects->elementAt(seg-1) != NULL ||
|
|
variablesVector->elementAt(index) != NULL) {
|
|
// should never happen
|
|
status = U_INTERNAL_TRANSLITERATOR_ERROR;
|
|
return;
|
|
}
|
|
segmentObjects->setElementAt(adopted, seg-1);
|
|
variablesVector->setElementAt(adopted, index);
|
|
}
|
|
|
|
/**
|
|
* Return the stand-in for the dot set. It is allocated the first
|
|
* time and reused thereafter.
|
|
*/
|
|
UChar TransliteratorParser::getDotStandIn() {
|
|
if (dotStandIn == (UChar) -1) {
|
|
dotStandIn = generateStandInFor(new UnicodeSet(DOT_SET, status));
|
|
}
|
|
return dotStandIn;
|
|
}
|
|
|
|
/**
|
|
* Append the value of the given variable name to the given
|
|
* UnicodeString.
|
|
*/
|
|
void TransliteratorParser::appendVariableDef(const UnicodeString& name,
|
|
UnicodeString& buf) {
|
|
const UnicodeString* s = (const UnicodeString*) data->variableNames->get(name);
|
|
if (s == NULL) {
|
|
// We allow one undefined variable so that variable definition
|
|
// statements work. For the first undefined variable we return
|
|
// the special placeholder variableLimit-1, and save the variable
|
|
// name.
|
|
if (undefinedVariableName.length() == 0) {
|
|
undefinedVariableName = name;
|
|
if (variableNext >= variableLimit) {
|
|
// throw new RuntimeException("Private use variables exhausted");
|
|
status = U_ILLEGAL_ARGUMENT_ERROR;
|
|
return;
|
|
}
|
|
buf.append((UChar) --variableLimit);
|
|
} else {
|
|
//throw new IllegalArgumentException("Undefined variable $"
|
|
// + name);
|
|
status = U_ILLEGAL_ARGUMENT_ERROR;
|
|
return;
|
|
}
|
|
} else {
|
|
buf.append(*s);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Glue method to get around access restrictions in C++.
|
|
*/
|
|
Transliterator* TransliteratorParser::createBasicInstance(const UnicodeString& id, const UnicodeString* canonID) {
|
|
return Transliterator::createBasicInstance(id, canonID);
|
|
}
|
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U_NAMESPACE_END
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#endif /* #if !UCONFIG_NO_TRANSLITERATION */
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