-
+// © 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
//
// file: rbbiscan.cpp
//
-// Copyright (C) 2002-2008, International Business Machines Corporation and others.
+// Copyright (C) 2002-2016, International Business Machines Corporation and others.
// All Rights Reserved.
//
// This file contains the Rule Based Break Iterator Rule Builder functions for
#include "unicode/uchriter.h"
#include "unicode/parsepos.h"
#include "unicode/parseerr.h"
-#include "util.h"
#include "cmemory.h"
#include "cstring.h"
#include "uassert.h"
-
//------------------------------------------------------------------------------
//
// Unicode Set init strings for each of the character classes needed for parsing a rule file.
//
//------------------------------------------------------------------------------
static const UChar gRuleSet_rule_char_pattern[] = {
+ // Characters that may appear as literals in patterns without escaping or quoting.
// [ ^ [ \ p { Z } \ u 0 0 2 0
0x5b, 0x5e, 0x5b, 0x5c, 0x70, 0x7b, 0x5a, 0x7d, 0x5c, 0x75, 0x30, 0x30, 0x32, 0x30,
// - \ u 0 0 7 f ] - [ \ p
U_CDECL_BEGIN
static void U_CALLCONV RBBISetTable_deleter(void *p) {
- U_NAMESPACE_QUALIFIER RBBISetTableEl *px = (U_NAMESPACE_QUALIFIER RBBISetTableEl *)p;
+ icu::RBBISetTableEl *px = (icu::RBBISetTableEl *)p;
delete px->key;
// Note: px->val is owned by the linked list "fSetsListHead" in scanner.
// Don't delete the value nodes here.
RBBIRuleScanner::RBBIRuleScanner(RBBIRuleBuilder *rb)
{
fRB = rb;
+ fScanIndex = 0;
+ fNextIndex = 0;
+ fQuoteMode = FALSE;
+ fLineNum = 1;
+ fCharNum = 0;
+ fLastChar = 0;
+
+ fStateTable = NULL;
+ fStack[0] = 0;
fStackPtr = 0;
- fStack[fStackPtr] = 0;
- fNodeStackPtr = 0;
- fRuleNum = 0;
fNodeStack[0] = NULL;
-
- fSymbolTable = NULL;
- fSetTable = NULL;
-
- fScanIndex = 0;
- fNextIndex = 0;
+ fNodeStackPtr = 0;
fReverseRule = FALSE;
fLookAheadRule = FALSE;
+ fNoChainInRule = FALSE;
- fLineNum = 1;
- fCharNum = 0;
- fQuoteMode = FALSE;
+ fSymbolTable = NULL;
+ fSetTable = NULL;
+ fRuleNum = 0;
+ fOptionStart = 0;
// Do not check status until after all critical fields are sufficiently initialized
// that the destructor can run cleanly.
// all instances of RBBIRuleScanners. BUT this is quite a bit simpler,
// and the time to build these few sets should be small compared to a
// full break iterator build.
- fRuleSets[kRuleSet_rule_char-128] = UnicodeSet(gRuleSet_rule_char_pattern, *rb->fStatus);
- UnicodeSet *whitespaceSet = uprv_openRuleWhiteSpaceSet(rb->fStatus);
- if (U_FAILURE(*rb->fStatus)) {
- return;
- }
- fRuleSets[kRuleSet_white_space-128] = *whitespaceSet;
- delete whitespaceSet;
- fRuleSets[kRuleSet_name_char-128] = UnicodeSet(gRuleSet_name_char_pattern, *rb->fStatus);
- fRuleSets[kRuleSet_name_start_char-128] = UnicodeSet(gRuleSet_name_start_char_pattern, *rb->fStatus);
- fRuleSets[kRuleSet_digit_char-128] = UnicodeSet(gRuleSet_digit_char_pattern, *rb->fStatus);
+ fRuleSets[kRuleSet_rule_char-128]
+ = UnicodeSet(UnicodeString(gRuleSet_rule_char_pattern), *rb->fStatus);
+ // fRuleSets[kRuleSet_white_space-128] = [:Pattern_White_Space:]
+ fRuleSets[kRuleSet_white_space-128].
+ add(9, 0xd).add(0x20).add(0x85).add(0x200e, 0x200f).add(0x2028, 0x2029);
+ fRuleSets[kRuleSet_name_char-128]
+ = UnicodeSet(UnicodeString(gRuleSet_name_char_pattern), *rb->fStatus);
+ fRuleSets[kRuleSet_name_start_char-128]
+ = UnicodeSet(UnicodeString(gRuleSet_name_start_char_pattern), *rb->fStatus);
+ fRuleSets[kRuleSet_digit_char-128]
+ = UnicodeSet(UnicodeString(gRuleSet_digit_char_pattern), *rb->fStatus);
if (*rb->fStatus == U_ILLEGAL_ARGUMENT_ERROR) {
// This case happens if ICU's data is missing. UnicodeSet tries to look up property
- // names from the init string, can't find them, and claims an illegal arguement.
+ // names from the init string, can't find them, and claims an illegal argument.
// Change the error so that the actual problem will be clearer to users.
*rb->fStatus = U_BRK_INIT_ERROR;
}
break;
+ case doNoChain:
+ // Scanned a '^' while on the rule start state.
+ fNoChainInRule = TRUE;
+ break;
+
+
case doExprOrOperator:
{
fixOpStack(RBBINode::precOpCat);
RBBINode *operandNode = fNodeStack[fNodeStackPtr--];
RBBINode *orNode = pushNewNode(RBBINode::opOr);
+ if (U_FAILURE(*fRB->fStatus)) {
+ break;
+ }
orNode->fLeftChild = operandNode;
operandNode->fParent = orNode;
}
fixOpStack(RBBINode::precOpCat);
RBBINode *operandNode = fNodeStack[fNodeStackPtr--];
RBBINode *catNode = pushNewNode(RBBINode::opCat);
+ if (U_FAILURE(*fRB->fStatus)) {
+ break;
+ }
catNode->fLeftChild = operandNode;
operandNode->fParent = catNode;
}
if (fRB->fDebugEnv && uprv_strstr(fRB->fDebugEnv, "rtree")) {printNodeStack("end of rule");}
#endif
U_ASSERT(fNodeStackPtr == 1);
+ RBBINode *thisRule = fNodeStack[fNodeStackPtr];
// If this rule includes a look-ahead '/', add a endMark node to the
// expression tree.
if (fLookAheadRule) {
- RBBINode *thisRule = fNodeStack[fNodeStackPtr];
RBBINode *endNode = pushNewNode(RBBINode::endMark);
RBBINode *catNode = pushNewNode(RBBINode::opCat);
+ if (U_FAILURE(*fRB->fStatus)) {
+ break;
+ }
fNodeStackPtr -= 2;
catNode->fLeftChild = thisRule;
catNode->fRightChild = endNode;
fNodeStack[fNodeStackPtr] = catNode;
endNode->fVal = fRuleNum;
endNode->fLookAheadEnd = TRUE;
+ thisRule = catNode;
+
+ // TODO: Disable chaining out of look-ahead (hard break) rules.
+ // The break on rule match is forced, so there is no point in building up
+ // the state table to chain into another rule for a longer match.
}
+ // Mark this node as being the root of a rule.
+ thisRule->fRuleRoot = TRUE;
+
+ // Flag if chaining into this rule is wanted.
+ //
+ if (fRB->fChainRules && // If rule chaining is enabled globally via !!chain
+ !fNoChainInRule) { // and no '^' chain-in inhibit was on this rule
+ thisRule->fChainIn = TRUE;
+ }
+
+
// All rule expressions are ORed together.
// The ';' that terminates an expression really just functions as a '|' with
// a low operator prededence.
// (forward, reverse, safe_forward, safe_reverse)
// OR this rule into the appropriate group of them.
//
- RBBINode **destRules = (fReverseRule? &fRB->fReverseTree : fRB->fDefaultTree);
+ RBBINode **destRules = (fReverseRule? &fRB->fSafeRevTree : fRB->fDefaultTree);
if (*destRules != NULL) {
// This is not the first rule encounted.
// with the current rule expression (on the Node Stack)
// with the resulting OR expression going to *destRules
//
- RBBINode *thisRule = fNodeStack[fNodeStackPtr];
+ thisRule = fNodeStack[fNodeStackPtr];
RBBINode *prevRules = *destRules;
RBBINode *orNode = pushNewNode(RBBINode::opOr);
+ if (U_FAILURE(*fRB->fStatus)) {
+ break;
+ }
orNode->fLeftChild = prevRules;
prevRules->fParent = orNode;
orNode->fRightChild = thisRule;
}
fReverseRule = FALSE; // in preparation for the next rule.
fLookAheadRule = FALSE;
+ fNoChainInRule = FALSE;
fNodeStackPtr = 0;
}
break;
{
RBBINode *operandNode = fNodeStack[fNodeStackPtr--];
RBBINode *plusNode = pushNewNode(RBBINode::opPlus);
+ if (U_FAILURE(*fRB->fStatus)) {
+ break;
+ }
plusNode->fLeftChild = operandNode;
operandNode->fParent = plusNode;
}
{
RBBINode *operandNode = fNodeStack[fNodeStackPtr--];
RBBINode *qNode = pushNewNode(RBBINode::opQuestion);
+ if (U_FAILURE(*fRB->fStatus)) {
+ break;
+ }
qNode->fLeftChild = operandNode;
operandNode->fParent = qNode;
}
{
RBBINode *operandNode = fNodeStack[fNodeStackPtr--];
RBBINode *starNode = pushNewNode(RBBINode::opStar);
+ if (U_FAILURE(*fRB->fStatus)) {
+ break;
+ }
starNode->fLeftChild = operandNode;
operandNode->fParent = starNode;
}
// sets that just happen to contain only one character.
{
n = pushNewNode(RBBINode::setRef);
- findSetFor(fC.fChar, n);
+ if (U_FAILURE(*fRB->fStatus)) {
+ break;
+ }
+ findSetFor(UnicodeString(fC.fChar), n);
n->fFirstPos = fScanIndex;
n->fLastPos = fNextIndex;
fRB->fRules.extractBetween(n->fFirstPos, n->fLastPos, n->fText);
// scanned a ".", meaning match any single character.
{
n = pushNewNode(RBBINode::setRef);
- findSetFor(kAny, n);
+ if (U_FAILURE(*fRB->fStatus)) {
+ break;
+ }
+ findSetFor(UnicodeString(TRUE, kAny, 3), n);
n->fFirstPos = fScanIndex;
n->fLastPos = fNextIndex;
fRB->fRules.extractBetween(n->fFirstPos, n->fLastPos, n->fText);
case doSlash:
// Scanned a '/', which identifies a look-ahead break position in a rule.
n = pushNewNode(RBBINode::lookAhead);
+ if (U_FAILURE(*fRB->fStatus)) {
+ break;
+ }
n->fVal = fRuleNum;
n->fFirstPos = fScanIndex;
n->fLastPos = fNextIndex;
case doStartTagValue:
// Scanned a '{', the opening delimiter for a tag value within a rule.
n = pushNewNode(RBBINode::tag);
+ if (U_FAILURE(*fRB->fStatus)) {
+ break;
+ }
n->fVal = 0;
n->fFirstPos = fScanIndex;
n->fLastPos = fNextIndex;
fRB->fDefaultTree = &fRB->fSafeRevTree;
} else if (opt == UNICODE_STRING("lookAheadHardBreak", 18)) {
fRB->fLookAheadHardBreak = TRUE;
+ } else if (opt == UNICODE_STRING("quoted_literals_only", 20)) {
+ fRuleSets[kRuleSet_rule_char-128].clear();
+ } else if (opt == UNICODE_STRING("unquoted_literals", 17)) {
+ fRuleSets[kRuleSet_rule_char-128].applyPattern(UnicodeString(gRuleSet_rule_char_pattern), *fRB->fStatus);
} else {
error(U_BRK_UNRECOGNIZED_OPTION);
}
returnVal = FALSE;
break;
}
- return returnVal;
+ return returnVal && U_SUCCESS(*fRB->fStatus);
}
fRB->fParseError->line = fLineNum;
fRB->fParseError->offset = fCharNum;
fRB->fParseError->preContext[0] = 0;
- fRB->fParseError->preContext[0] = 0;
+ fRB->fParseError->postContext[0] = 0;
}
}
}
//------------------------------------------------------------------------------
//
-// stripRules Return a rules string without unnecessary
-// characters.
+// stripRules Return a rules string without extra spaces.
+// (Comments are removed separately, during rule parsing.)
//
//------------------------------------------------------------------------------
UnicodeString RBBIRuleScanner::stripRules(const UnicodeString &rules) {
UnicodeString strippedRules;
- int rulesLength = rules.length();
- for (int idx = 0; idx < rulesLength; ) {
- UChar ch = rules[idx++];
- if (ch == chPound) {
- while (idx < rulesLength
- && ch != chCR && ch != chLF && ch != chNEL)
- {
- ch = rules[idx++];
- }
- }
- if (!u_isISOControl(ch)) {
- strippedRules.append(ch);
+ int32_t rulesLength = rules.length();
+ bool skippingSpaces = false;
+
+ for (int32_t idx=0; idx<rulesLength; idx = rules.moveIndex32(idx, 1)) {
+ UChar32 cp = rules.char32At(idx);
+ bool whiteSpace = u_hasBinaryProperty(cp, UCHAR_PATTERN_WHITE_SPACE);
+ if (skippingSpaces && whiteSpace) {
+ continue;
}
+ strippedRules.append(cp);
+ skippingSpaces = whiteSpace;
}
- // strippedRules = strippedRules.unescape();
return strippedRules;
}
if (ch == chCR ||
ch == chNEL ||
ch == chLS ||
- ch == chLF && fLastChar != chCR) {
+ (ch == chLF && fLastChar != chCR)) {
// Character is starting a new line. Bump up the line number, and
// reset the column to 0.
fLineNum++;
// It will be treated as white-space, and serves to break up anything
// that might otherwise incorrectly clump together with a comment in
// the middle (a variable name, for example.)
+ int32_t commentStart = fScanIndex;
for (;;) {
c.fChar = nextCharLL();
if (c.fChar == (UChar32)-1 || // EOF
c.fChar == chNEL ||
c.fChar == chLS) {break;}
}
+ for (int32_t i=commentStart; i<fNextIndex-1; ++i) {
+ fRB->fStrippedRules.setCharAt(i, u' ');
+ }
}
if (c.fChar == (UChar32)-1) {
return;
for (;;) {
#ifdef RBBI_DEBUG
- if (fRB->fDebugEnv && uprv_strstr(fRB->fDebugEnv, "scan")) { RBBIDebugPrintf(".");}
+ if (fRB->fDebugEnv && uprv_strstr(fRB->fDebugEnv, "scan")) { RBBIDebugPrintf("."); fflush(stdout);}
#endif
if (tableEl->fCharClass < 127 && fC.fEscaped == FALSE && tableEl->fCharClass == fC.fChar) {
// Table row specified an individual character, not a set, and
if (tableEl->fCharClass >= 128 && tableEl->fCharClass < 240 && // Table specs a char class &&
fC.fEscaped == FALSE && // char is not escaped &&
fC.fChar != (UChar32)-1) { // char is not EOF
+ U_ASSERT((tableEl->fCharClass-128) < UPRV_LENGTHOF(fRuleSets));
if (fRuleSets[tableEl->fCharClass-128].contains(fC.fChar)) {
// Table row specified a character class, or set of characters,
// and the current char matches it.
}
+ if (U_FAILURE(*fRB->fStatus)) {
+ return;
+ }
+
+ // If there are no forward rules set an error.
//
- // If there were NO user specified reverse rules, set up the equivalent of ".*;"
- //
- if (fRB->fReverseTree == NULL) {
- fRB->fReverseTree = pushNewNode(RBBINode::opStar);
- RBBINode *operand = pushNewNode(RBBINode::setRef);
- findSetFor(kAny, operand);
- fRB->fReverseTree->fLeftChild = operand;
- operand->fParent = fRB->fReverseTree;
- fNodeStackPtr -= 2;
+ if (fRB->fForwardTree == NULL) {
+ error(U_BRK_RULE_SYNTAX);
+ return;
}
-
//
// Parsing of the input RBBI rules is complete.
// We now have a parse tree for the rule expressions
//
#ifdef RBBI_DEBUG
if (fRB->fDebugEnv && uprv_strstr(fRB->fDebugEnv, "symbols")) {fSymbolTable->rbbiSymtablePrint();}
- if (fRB->fDebugEnv && uprv_strstr(fRB->fDebugEnv, "ptree"))
- {
+ if (fRB->fDebugEnv && uprv_strstr(fRB->fDebugEnv, "ptree")) {
RBBIDebugPrintf("Completed Forward Rules Parse Tree...\n");
- fRB->fForwardTree->printTree(TRUE);
+ RBBINode::printTree(fRB->fForwardTree, TRUE);
RBBIDebugPrintf("\nCompleted Reverse Rules Parse Tree...\n");
- fRB->fReverseTree->printTree(TRUE);
+ RBBINode::printTree(fRB->fReverseTree, TRUE);
RBBIDebugPrintf("\nCompleted Safe Point Forward Rules Parse Tree...\n");
- fRB->fSafeFwdTree->printTree(TRUE);
+ RBBINode::printTree(fRB->fSafeFwdTree, TRUE);
RBBIDebugPrintf("\nCompleted Safe Point Reverse Rules Parse Tree...\n");
- fRB->fSafeRevTree->printTree(TRUE);
+ RBBINode::printTree(fRB->fSafeRevTree, TRUE);
}
#endif
}
void RBBIRuleScanner::printNodeStack(const char *title) {
int i;
RBBIDebugPrintf("%s. Dumping node stack...\n", title);
- for (i=fNodeStackPtr; i>0; i--) {fNodeStack[i]->printTree(TRUE);}
+ for (i=fNodeStackPtr; i>0; i--) {RBBINode::printTree(fNodeStack[i], TRUE);}
}
#endif
//
//------------------------------------------------------------------------------
RBBINode *RBBIRuleScanner::pushNewNode(RBBINode::NodeType t) {
- fNodeStackPtr++;
- if (fNodeStackPtr >= kStackSize) {
- error(U_BRK_INTERNAL_ERROR);
+ if (U_FAILURE(*fRB->fStatus)) {
+ return NULL;
+ }
+ if (fNodeStackPtr >= kStackSize - 1) {
+ error(U_BRK_RULE_SYNTAX);
RBBIDebugPuts("RBBIRuleScanner::pushNewNode - stack overflow.");
- *fRB->fStatus = U_BRK_INTERNAL_ERROR;
return NULL;
}
+ fNodeStackPtr++;
fNodeStack[fNodeStackPtr] = new RBBINode(t);
if (fNodeStack[fNodeStackPtr] == NULL) {
*fRB->fStatus = U_MEMORY_ALLOCATION_ERROR;
pos.setIndex(fScanIndex);
startPos = fScanIndex;
UErrorCode localStatus = U_ZERO_ERROR;
- uset = new UnicodeSet(fRB->fRules, pos, USET_IGNORE_SPACE,
- fSymbolTable,
- localStatus);
+ uset = new UnicodeSet();
if (uset == NULL) {
localStatus = U_MEMORY_ALLOCATION_ERROR;
+ } else {
+ uset->applyPatternIgnoreSpace(fRB->fRules, pos, fSymbolTable, localStatus);
}
if (U_FAILURE(localStatus)) {
// TODO: Get more accurate position of the error from UnicodeSet's return info.
// Verify that the set contains at least one code point.
//
+ U_ASSERT(uset!=NULL);
if (uset->isEmpty()) {
// This set is empty.
// Make it an error, because it almost certainly is not what the user wanted.
RBBINode *n;
n = pushNewNode(RBBINode::setRef);
+ if (U_FAILURE(*fRB->fStatus)) {
+ return;
+ }
n->fFirstPos = startPos;
n->fLastPos = fNextIndex;
fRB->fRules.extractBetween(n->fFirstPos, n->fLastPos, n->fText);
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