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scuffed-code/icu4c/source/i18n/repattrn.cpp

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// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html
//
// file: repattrn.cpp
//
/*
***************************************************************************
* Copyright (C) 2002-2016 International Business Machines Corporation
* and others. All rights reserved.
***************************************************************************
*/
#include "unicode/utypes.h"
#if !UCONFIG_NO_REGULAR_EXPRESSIONS
#include "unicode/regex.h"
#include "unicode/uclean.h"
#include "cmemory.h"
#include "cstr.h"
#include "uassert.h"
#include "uhash.h"
#include "uvector.h"
#include "uvectr32.h"
#include "uvectr64.h"
#include "regexcmp.h"
#include "regeximp.h"
#include "regexst.h"
U_NAMESPACE_BEGIN
//--------------------------------------------------------------------------
//
// RegexPattern Default Constructor
//
//--------------------------------------------------------------------------
RegexPattern::RegexPattern() {
// Init all of this instances data.
init();
}
//--------------------------------------------------------------------------
//
// Copy Constructor Note: This is a rather inefficient implementation,
// but it probably doesn't matter.
//
//--------------------------------------------------------------------------
RegexPattern::RegexPattern(const RegexPattern &other) : UObject(other) {
init();
*this = other;
}
//--------------------------------------------------------------------------
//
// Assignment Operator
//
//--------------------------------------------------------------------------
RegexPattern &RegexPattern::operator = (const RegexPattern &other) {
if (this == &other) {
// Source and destination are the same. Don't do anything.
return *this;
}
// Clean out any previous contents of object being assigned to.
zap();
// Give target object a default initialization
init();
// Copy simple fields
fDeferredStatus = other.fDeferredStatus;
if (U_FAILURE(fDeferredStatus)) {
return *this;
}
if (other.fPatternString == NULL) {
fPatternString = NULL;
fPattern = utext_clone(fPattern, other.fPattern, FALSE, TRUE, &fDeferredStatus);
} else {
fPatternString = new UnicodeString(*(other.fPatternString));
if (fPatternString == NULL) {
fDeferredStatus = U_MEMORY_ALLOCATION_ERROR;
} else {
fPattern = utext_openConstUnicodeString(NULL, fPatternString, &fDeferredStatus);
}
}
if (U_FAILURE(fDeferredStatus)) {
return *this;
}
fFlags = other.fFlags;
fLiteralText = other.fLiteralText;
fMinMatchLen = other.fMinMatchLen;
fFrameSize = other.fFrameSize;
fDataSize = other.fDataSize;
fStaticSets = other.fStaticSets;
fStaticSets8 = other.fStaticSets8;
fStartType = other.fStartType;
fInitialStringIdx = other.fInitialStringIdx;
fInitialStringLen = other.fInitialStringLen;
*fInitialChars = *other.fInitialChars;
fInitialChar = other.fInitialChar;
*fInitialChars8 = *other.fInitialChars8;
fNeedsAltInput = other.fNeedsAltInput;
// Copy the pattern. It's just values, nothing deep to copy.
fCompiledPat->assign(*other.fCompiledPat, fDeferredStatus);
fGroupMap->assign(*other.fGroupMap, fDeferredStatus);
// Copy the Unicode Sets.
// Could be made more efficient if the sets were reference counted and shared,
// but I doubt that pattern copying will be particularly common.
// Note: init() already added an empty element zero to fSets
int32_t i;
int32_t numSets = other.fSets->size();
fSets8 = new Regex8BitSet[numSets];
if (fSets8 == NULL) {
fDeferredStatus = U_MEMORY_ALLOCATION_ERROR;
return *this;
}
for (i=1; i<numSets; i++) {
if (U_FAILURE(fDeferredStatus)) {
return *this;
}
UnicodeSet *sourceSet = (UnicodeSet *)other.fSets->elementAt(i);
UnicodeSet *newSet = new UnicodeSet(*sourceSet);
if (newSet == NULL) {
fDeferredStatus = U_MEMORY_ALLOCATION_ERROR;
break;
}
fSets->addElement(newSet, fDeferredStatus);
fSets8[i] = other.fSets8[i];
}
// Copy the named capture group hash map.
if (other.fNamedCaptureMap != nullptr && initNamedCaptureMap()) {
int32_t hashPos = UHASH_FIRST;
while (const UHashElement *hashEl = uhash_nextElement(other.fNamedCaptureMap, &hashPos)) {
if (U_FAILURE(fDeferredStatus)) {
break;
}
const UnicodeString *name = (const UnicodeString *)hashEl->key.pointer;
UnicodeString *key = new UnicodeString(*name);
int32_t val = hashEl->value.integer;
if (key == NULL) {
fDeferredStatus = U_MEMORY_ALLOCATION_ERROR;
} else {
uhash_puti(fNamedCaptureMap, key, val, &fDeferredStatus);
}
}
}
return *this;
}
//--------------------------------------------------------------------------
//
// init Shared initialization for use by constructors.
// Bring an uninitialized RegexPattern up to a default state.
//
//--------------------------------------------------------------------------
void RegexPattern::init() {
fFlags = 0;
fCompiledPat = 0;
fLiteralText.remove();
fSets = NULL;
fSets8 = NULL;
fDeferredStatus = U_ZERO_ERROR;
fMinMatchLen = 0;
fFrameSize = 0;
fDataSize = 0;
fGroupMap = NULL;
fStaticSets = NULL;
fStaticSets8 = NULL;
fStartType = START_NO_INFO;
fInitialStringIdx = 0;
fInitialStringLen = 0;
fInitialChars = NULL;
fInitialChar = 0;
fInitialChars8 = NULL;
fNeedsAltInput = FALSE;
fNamedCaptureMap = NULL;
fPattern = NULL; // will be set later
fPatternString = NULL; // may be set later
fCompiledPat = new UVector64(fDeferredStatus);
fGroupMap = new UVector32(fDeferredStatus);
fSets = new UVector(fDeferredStatus);
fInitialChars = new UnicodeSet;
fInitialChars8 = new Regex8BitSet;
if (U_FAILURE(fDeferredStatus)) {
return;
}
if (fCompiledPat == NULL || fGroupMap == NULL || fSets == NULL ||
fInitialChars == NULL || fInitialChars8 == NULL) {
fDeferredStatus = U_MEMORY_ALLOCATION_ERROR;
return;
}
// Slot zero of the vector of sets is reserved. Fill it here.
fSets->addElement((int32_t)0, fDeferredStatus);
}
bool RegexPattern::initNamedCaptureMap() {
if (fNamedCaptureMap) {
return true;
}
fNamedCaptureMap = uhash_openSize(uhash_hashUnicodeString, // Key hash function
uhash_compareUnicodeString, // Key comparator function
uhash_compareLong, // Value comparator function
7, // Initial table capacity
&fDeferredStatus);
if (U_FAILURE(fDeferredStatus)) {
return false;
}
// fNamedCaptureMap owns its key strings, type (UnicodeString *)
uhash_setKeyDeleter(fNamedCaptureMap, uprv_deleteUObject);
return true;
}
//--------------------------------------------------------------------------
//
// zap Delete everything owned by this RegexPattern.
//
//--------------------------------------------------------------------------
void RegexPattern::zap() {
delete fCompiledPat;
fCompiledPat = NULL;
int i;
for (i=1; i<fSets->size(); i++) {
UnicodeSet *s;
s = (UnicodeSet *)fSets->elementAt(i);
if (s != NULL) {
delete s;
}
}
delete fSets;
fSets = NULL;
delete[] fSets8;
fSets8 = NULL;
delete fGroupMap;
fGroupMap = NULL;
delete fInitialChars;
fInitialChars = NULL;
delete fInitialChars8;
fInitialChars8 = NULL;
if (fPattern != NULL) {
utext_close(fPattern);
fPattern = NULL;
}
if (fPatternString != NULL) {
delete fPatternString;
fPatternString = NULL;
}
if (fNamedCaptureMap != NULL) {
uhash_close(fNamedCaptureMap);
fNamedCaptureMap = NULL;
}
}
//--------------------------------------------------------------------------
//
// Destructor
//
//--------------------------------------------------------------------------
RegexPattern::~RegexPattern() {
zap();
}
//--------------------------------------------------------------------------
//
// Clone
//
//--------------------------------------------------------------------------
RegexPattern *RegexPattern::clone() const {
RegexPattern *copy = new RegexPattern(*this);
return copy;
}
//--------------------------------------------------------------------------
//
// operator == (comparison) Consider to patterns to be == if the
// pattern strings and the flags are the same.
// Note that pattern strings with the same
// characters can still be considered different.
//
//--------------------------------------------------------------------------
UBool RegexPattern::operator ==(const RegexPattern &other) const {
if (this->fFlags == other.fFlags && this->fDeferredStatus == other.fDeferredStatus) {
if (this->fPatternString != NULL && other.fPatternString != NULL) {
return *(this->fPatternString) == *(other.fPatternString);
} else if (this->fPattern == NULL) {
if (other.fPattern == NULL) {
return TRUE;
}
} else if (other.fPattern != NULL) {
UTEXT_SETNATIVEINDEX(this->fPattern, 0);
UTEXT_SETNATIVEINDEX(other.fPattern, 0);
return utext_equals(this->fPattern, other.fPattern);
}
}
return FALSE;
}
//---------------------------------------------------------------------
//
// compile
//
//---------------------------------------------------------------------
RegexPattern * U_EXPORT2
RegexPattern::compile(const UnicodeString &regex,
uint32_t flags,
UParseError &pe,
UErrorCode &status)
{
if (U_FAILURE(status)) {
return NULL;
}
const uint32_t allFlags = UREGEX_CANON_EQ | UREGEX_CASE_INSENSITIVE | UREGEX_COMMENTS |
UREGEX_DOTALL | UREGEX_MULTILINE | UREGEX_UWORD |
UREGEX_ERROR_ON_UNKNOWN_ESCAPES | UREGEX_UNIX_LINES | UREGEX_LITERAL;
if ((flags & ~allFlags) != 0) {
status = U_REGEX_INVALID_FLAG;
return NULL;
}
if ((flags & UREGEX_CANON_EQ) != 0) {
status = U_REGEX_UNIMPLEMENTED;
return NULL;
}
RegexPattern *This = new RegexPattern;
if (This == NULL) {
status = U_MEMORY_ALLOCATION_ERROR;
return NULL;
}
if (U_FAILURE(This->fDeferredStatus)) {
status = This->fDeferredStatus;
delete This;
return NULL;
}
This->fFlags = flags;
RegexCompile compiler(This, status);
compiler.compile(regex, pe, status);
if (U_FAILURE(status)) {
delete This;
This = NULL;
}
return This;
}
//
// compile, UText mode
//
RegexPattern * U_EXPORT2
RegexPattern::compile(UText *regex,
uint32_t flags,
UParseError &pe,
UErrorCode &status)
{
if (U_FAILURE(status)) {
return NULL;
}
const uint32_t allFlags = UREGEX_CANON_EQ | UREGEX_CASE_INSENSITIVE | UREGEX_COMMENTS |
UREGEX_DOTALL | UREGEX_MULTILINE | UREGEX_UWORD |
UREGEX_ERROR_ON_UNKNOWN_ESCAPES | UREGEX_UNIX_LINES | UREGEX_LITERAL;
if ((flags & ~allFlags) != 0) {
status = U_REGEX_INVALID_FLAG;
return NULL;
}
if ((flags & UREGEX_CANON_EQ) != 0) {
status = U_REGEX_UNIMPLEMENTED;
return NULL;
}
RegexPattern *This = new RegexPattern;
if (This == NULL) {
status = U_MEMORY_ALLOCATION_ERROR;
return NULL;
}
if (U_FAILURE(This->fDeferredStatus)) {
status = This->fDeferredStatus;
delete This;
return NULL;
}
This->fFlags = flags;
RegexCompile compiler(This, status);
compiler.compile(regex, pe, status);
if (U_FAILURE(status)) {
delete This;
This = NULL;
}
return This;
}
//
// compile with default flags.
//
RegexPattern * U_EXPORT2
RegexPattern::compile(const UnicodeString &regex,
UParseError &pe,
UErrorCode &err)
{
return compile(regex, 0, pe, err);
}
//
// compile with default flags, UText mode
//
RegexPattern * U_EXPORT2
RegexPattern::compile(UText *regex,
UParseError &pe,
UErrorCode &err)
{
return compile(regex, 0, pe, err);
}
//
// compile with no UParseErr parameter.
//
RegexPattern * U_EXPORT2
RegexPattern::compile(const UnicodeString &regex,
uint32_t flags,
UErrorCode &err)
{
UParseError pe;
return compile(regex, flags, pe, err);
}
//
// compile with no UParseErr parameter, UText mode
//
RegexPattern * U_EXPORT2
RegexPattern::compile(UText *regex,
uint32_t flags,
UErrorCode &err)
{
UParseError pe;
return compile(regex, flags, pe, err);
}
//---------------------------------------------------------------------
//
// flags
//
//---------------------------------------------------------------------
uint32_t RegexPattern::flags() const {
return fFlags;
}
//---------------------------------------------------------------------
//
// matcher(UnicodeString, err)
//
//---------------------------------------------------------------------
RegexMatcher *RegexPattern::matcher(const UnicodeString &input,
UErrorCode &status) const {
RegexMatcher *retMatcher = matcher(status);
if (retMatcher != NULL) {
retMatcher->fDeferredStatus = status;
retMatcher->reset(input);
}
return retMatcher;
}
//---------------------------------------------------------------------
//
// matcher(status)
//
//---------------------------------------------------------------------
RegexMatcher *RegexPattern::matcher(UErrorCode &status) const {
RegexMatcher *retMatcher = NULL;
if (U_FAILURE(status)) {
return NULL;
}
if (U_FAILURE(fDeferredStatus)) {
status = fDeferredStatus;
return NULL;
}
retMatcher = new RegexMatcher(this);
if (retMatcher == NULL) {
status = U_MEMORY_ALLOCATION_ERROR;
return NULL;
}
return retMatcher;
}
//---------------------------------------------------------------------
//
// matches Convenience function to test for a match, starting
// with a pattern string and a data string.
//
//---------------------------------------------------------------------
UBool U_EXPORT2 RegexPattern::matches(const UnicodeString &regex,
const UnicodeString &input,
UParseError &pe,
UErrorCode &status) {
if (U_FAILURE(status)) {return FALSE;}
UBool retVal;
RegexPattern *pat = NULL;
RegexMatcher *matcher = NULL;
pat = RegexPattern::compile(regex, 0, pe, status);
matcher = pat->matcher(input, status);
retVal = matcher->matches(status);
delete matcher;
delete pat;
return retVal;
}
//
// matches, UText mode
//
UBool U_EXPORT2 RegexPattern::matches(UText *regex,
UText *input,
UParseError &pe,
UErrorCode &status) {
if (U_FAILURE(status)) {return FALSE;}
UBool retVal = FALSE;
RegexPattern *pat = NULL;
RegexMatcher *matcher = NULL;
pat = RegexPattern::compile(regex, 0, pe, status);
matcher = pat->matcher(status);
if (U_SUCCESS(status)) {
matcher->reset(input);
retVal = matcher->matches(status);
}
delete matcher;
delete pat;
return retVal;
}
//---------------------------------------------------------------------
//
// pattern
//
//---------------------------------------------------------------------
UnicodeString RegexPattern::pattern() const {
if (fPatternString != NULL) {
return *fPatternString;
} else if (fPattern == NULL) {
return UnicodeString();
} else {
UErrorCode status = U_ZERO_ERROR;
int64_t nativeLen = utext_nativeLength(fPattern);
int32_t len16 = utext_extract(fPattern, 0, nativeLen, NULL, 0, &status); // buffer overflow error
UnicodeString result;
status = U_ZERO_ERROR;
UChar *resultChars = result.getBuffer(len16);
utext_extract(fPattern, 0, nativeLen, resultChars, len16, &status); // unterminated warning
result.releaseBuffer(len16);
return result;
}
}
//---------------------------------------------------------------------
//
// patternText
//
//---------------------------------------------------------------------
UText *RegexPattern::patternText(UErrorCode &status) const {
if (U_FAILURE(status)) {return NULL;}
status = U_ZERO_ERROR;
if (fPattern != NULL) {
return fPattern;
} else {
RegexStaticSets::initGlobals(&status);
return RegexStaticSets::gStaticSets->fEmptyText;
}
}
//--------------------------------------------------------------------------------
//
// groupNumberFromName()
//
//--------------------------------------------------------------------------------
int32_t RegexPattern::groupNumberFromName(const UnicodeString &groupName, UErrorCode &status) const {
if (U_FAILURE(status)) {
return 0;
}
// No need to explicitly check for syntactically valid names.
// Invalid ones will never be in the map, and the lookup will fail.
int32_t number = fNamedCaptureMap ? uhash_geti(fNamedCaptureMap, &groupName) : 0;
if (number == 0) {
status = U_REGEX_INVALID_CAPTURE_GROUP_NAME;
}
return number;
}
int32_t RegexPattern::groupNumberFromName(const char *groupName, int32_t nameLength, UErrorCode &status) const {
if (U_FAILURE(status)) {
return 0;
}
UnicodeString name(groupName, nameLength, US_INV);
return groupNumberFromName(name, status);
}
//---------------------------------------------------------------------
//
// split
//
//---------------------------------------------------------------------
int32_t RegexPattern::split(const UnicodeString &input,
UnicodeString dest[],
int32_t destCapacity,
UErrorCode &status) const
{
if (U_FAILURE(status)) {
return 0;
}
RegexMatcher m(this);
int32_t r = 0;
// Check m's status to make sure all is ok.
if (U_SUCCESS(m.fDeferredStatus)) {
r = m.split(input, dest, destCapacity, status);
}
return r;
}
//
// split, UText mode
//
int32_t RegexPattern::split(UText *input,
UText *dest[],
int32_t destCapacity,
UErrorCode &status) const
{
if (U_FAILURE(status)) {
return 0;
}
RegexMatcher m(this);
int32_t r = 0;
// Check m's status to make sure all is ok.
if (U_SUCCESS(m.fDeferredStatus)) {
r = m.split(input, dest, destCapacity, status);
}
return r;
}
//---------------------------------------------------------------------
//
// dump Output the compiled form of the pattern.
// Debugging function only.
//
//---------------------------------------------------------------------
void RegexPattern::dumpOp(int32_t index) const {
(void)index; // Suppress warnings in non-debug build.
#if defined(REGEX_DEBUG)
static const char * const opNames[] = {URX_OPCODE_NAMES};
int32_t op = fCompiledPat->elementAti(index);
int32_t val = URX_VAL(op);
int32_t type = URX_TYPE(op);
int32_t pinnedType = type;
if ((uint32_t)pinnedType >= UPRV_LENGTHOF(opNames)) {
pinnedType = 0;
}
printf("%4d %08x %-15s ", index, op, opNames[pinnedType]);
switch (type) {
case URX_NOP:
case URX_DOTANY:
case URX_DOTANY_ALL:
case URX_FAIL:
case URX_CARET:
case URX_DOLLAR:
case URX_BACKSLASH_G:
case URX_BACKSLASH_X:
case URX_END:
case URX_DOLLAR_M:
case URX_CARET_M:
// Types with no operand field of interest.
break;
case URX_RESERVED_OP:
case URX_START_CAPTURE:
case URX_END_CAPTURE:
case URX_STATE_SAVE:
case URX_JMP:
case URX_JMP_SAV:
case URX_JMP_SAV_X:
case URX_BACKSLASH_B:
case URX_BACKSLASH_BU:
case URX_BACKSLASH_D:
case URX_BACKSLASH_Z:
case URX_STRING_LEN:
case URX_CTR_INIT:
case URX_CTR_INIT_NG:
case URX_CTR_LOOP:
case URX_CTR_LOOP_NG:
case URX_RELOC_OPRND:
case URX_STO_SP:
case URX_LD_SP:
case URX_BACKREF:
case URX_STO_INP_LOC:
case URX_JMPX:
case URX_LA_START:
case URX_LA_END:
case URX_BACKREF_I:
case URX_LB_START:
case URX_LB_CONT:
case URX_LB_END:
case URX_LBN_CONT:
case URX_LBN_END:
case URX_LOOP_C:
case URX_LOOP_DOT_I:
case URX_BACKSLASH_H:
case URX_BACKSLASH_R:
case URX_BACKSLASH_V:
// types with an integer operand field.
printf("%d", val);
break;
case URX_ONECHAR:
case URX_ONECHAR_I:
if (val < 0x20) {
printf("%#x", val);
} else {
printf("'%s'", CStr(UnicodeString(val))());
}
break;
case URX_STRING:
case URX_STRING_I:
{
int32_t lengthOp = fCompiledPat->elementAti(index+1);
U_ASSERT(URX_TYPE(lengthOp) == URX_STRING_LEN);
int32_t length = URX_VAL(lengthOp);
UnicodeString str(fLiteralText, val, length);
printf("%s", CStr(str)());
}
break;
case URX_SETREF:
case URX_LOOP_SR_I:
{
UnicodeString s;
UnicodeSet *set = (UnicodeSet *)fSets->elementAt(val);
set->toPattern(s, TRUE);
printf("%s", CStr(s)());
}
break;
case URX_STATIC_SETREF:
case URX_STAT_SETREF_N:
{
UnicodeString s;
if (val & URX_NEG_SET) {
printf("NOT ");
val &= ~URX_NEG_SET;
}
UnicodeSet *set = fStaticSets[val];
set->toPattern(s, TRUE);
printf("%s", CStr(s)());
}
break;
default:
printf("??????");
break;
}
printf("\n");
#endif
}
void RegexPattern::dumpPattern() const {
#if defined(REGEX_DEBUG)
int index;
UnicodeString patStr;
for (UChar32 c = utext_next32From(fPattern, 0); c != U_SENTINEL; c = utext_next32(fPattern)) {
patStr.append(c);
}
printf("Original Pattern: \"%s\"\n", CStr(patStr)());
printf(" Min Match Length: %d\n", fMinMatchLen);
printf(" Match Start Type: %s\n", START_OF_MATCH_STR(fStartType));
if (fStartType == START_STRING) {
UnicodeString initialString(fLiteralText,fInitialStringIdx, fInitialStringLen);
printf(" Initial match string: \"%s\"\n", CStr(initialString)());
} else if (fStartType == START_SET) {
UnicodeString s;
fInitialChars->toPattern(s, TRUE);
printf(" Match First Chars: %s\n", CStr(s)());
} else if (fStartType == START_CHAR) {
printf(" First char of Match: ");
if (fInitialChar > 0x20) {
printf("'%s'\n", CStr(UnicodeString(fInitialChar))());
} else {
printf("%#x\n", fInitialChar);
}
}
printf("Named Capture Groups:\n");
if (!fNamedCaptureMap || uhash_count(fNamedCaptureMap) == 0) {
printf(" None\n");
} else {
int32_t pos = UHASH_FIRST;
const UHashElement *el = NULL;
while ((el = uhash_nextElement(fNamedCaptureMap, &pos))) {
const UnicodeString *name = (const UnicodeString *)el->key.pointer;
int32_t number = el->value.integer;
printf(" %d\t%s\n", number, CStr(*name)());
}
}
printf("\nIndex Binary Type Operand\n" \
"-------------------------------------------\n");
for (index = 0; index<fCompiledPat->size(); index++) {
dumpOp(index);
}
printf("\n\n");
#endif
}
UOBJECT_DEFINE_RTTI_IMPLEMENTATION(RegexPattern)
U_NAMESPACE_END
#endif // !UCONFIG_NO_REGULAR_EXPRESSIONS
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