The Tor Browser: intl/icu/source/i18n/rbt_set.cpp@b8a032363ba2 (annotated)

intl/icu/source/i18n/rbt_set.cpp@b8a032363ba2 (annotated)

intl/icu/source/i18n/rbt_set.cpp

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 /*
  **********************************************************************
  *   Copyright (C) 1999-2011, International Business Machines
  *   Corporation and others.  All Rights Reserved.
  **********************************************************************
  *   Date        Name        Description
  *   11/17/99    aliu        Creation.
  **********************************************************************
  */
 #include "unicode/utypes.h"
 #if !UCONFIG_NO_TRANSLITERATION
 #include "unicode/unistr.h"
 #include "unicode/uniset.h"
 #include "unicode/utf16.h"
 #include "rbt_set.h"
 #include "rbt_rule.h"
 #include "cmemory.h"
 #include "putilimp.h"
 U_CDECL_BEGIN
 static void U_CALLCONV _deleteRule(void *rule) {
     delete (icu::TransliterationRule *)rule;
 }
 U_CDECL_END
 //----------------------------------------------------------------------
 // BEGIN Debugging support
 //----------------------------------------------------------------------
 // #define DEBUG_RBT
 #ifdef DEBUG_RBT
 #include <stdio.h>
 #include "charstr.h"
 /**
  * @param appendTo result is appended to this param.
  * @param input the string being transliterated
  * @param pos the index struct
  */
 static UnicodeString& _formatInput(UnicodeString &appendTo,
                                    const UnicodeString& input,
                                    const UTransPosition& pos) {
     // Output a string of the form aaa{bbb|ccc|ddd}eee, where
     // the {} indicate the context start and limit, and the ||
     // indicate the start and limit.
     if (0 <= pos.contextStart &&
         pos.contextStart <= pos.start &&
         pos.start <= pos.limit &&
         pos.limit <= pos.contextLimit &&
         pos.contextLimit <= input.length()) {
         UnicodeString a, b, c, d, e;
         input.extractBetween(0, pos.contextStart, a);
         input.extractBetween(pos.contextStart, pos.start, b);
         input.extractBetween(pos.start, pos.limit, c);
         input.extractBetween(pos.limit, pos.contextLimit, d);
         input.extractBetween(pos.contextLimit, input.length(), e);
         appendTo.append(a).append((UChar)123/*{*/).append(b).
             append((UChar)124/*|*/).append(c).append((UChar)124/*|*/).append(d).
             append((UChar)125/*}*/).append(e);
     } else {
         appendTo.append("INVALID UTransPosition");
         //appendTo.append((UnicodeString)"INVALID UTransPosition {cs=" +
         //                pos.contextStart + ", s=" + pos.start + ", l=" +
         //                pos.limit + ", cl=" + pos.contextLimit + "} on " +
         //                input);
     }
     return appendTo;
 }
 // Append a hex string to the target
 UnicodeString& _appendHex(uint32_t number,
                           int32_t digits,
                           UnicodeString& target) {
     static const UChar digitString[] = {
 x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
 x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0
     };
     while (digits--) {
         target += digitString[(number >> (digits*4)) & 0xF];
     }
     return target;
 }
 // Replace nonprintable characters with unicode escapes
 UnicodeString& _escape(const UnicodeString &source,
                        UnicodeString &target) {
     for (int32_t i = 0; i < source.length(); ) {
         UChar32 ch = source.char32At(i);
         i += U16_LENGTH(ch);
         if (ch < 0x09 || (ch > 0x0A && ch < 0x20)|| ch > 0x7E) {
             if (ch <= 0xFFFF) {
                 target += "\\u";
                 _appendHex(ch, 4, target);
             } else {
                 target += "\\U";
                 _appendHex(ch, 8, target);
             }
         } else {
             target += ch;
         }
     }
     return target;
 }
 inline void _debugOut(const char* msg, TransliterationRule* rule,
                       const Replaceable& theText, UTransPosition& pos) {
     UnicodeString buf(msg, "");
     if (rule) {
         UnicodeString r;
         rule->toRule(r, TRUE);
         buf.append((UChar)32).append(r);
     }
     buf.append(UnicodeString(" => ", ""));
     UnicodeString* text = (UnicodeString*)&theText;
     _formatInput(buf, *text, pos);
     UnicodeString esc;
     _escape(buf, esc);
     CharString cbuf(esc);
     printf("%s\n", (const char*) cbuf);
 }
 #else
 #define _debugOut(msg, rule, theText, pos)
 #endif
 //----------------------------------------------------------------------
 // END Debugging support
 //----------------------------------------------------------------------
 // Fill the precontext and postcontext with the patterns of the rules
 // that are masking one another.
 static void maskingError(const icu::TransliterationRule& rule1,
                          const icu::TransliterationRule& rule2,
                          UParseError& parseError) {
     icu::UnicodeString r;
     int32_t len;
     parseError.line = parseError.offset = -1;
     // for pre-context
     rule1.toRule(r, FALSE);
     len = uprv_min(r.length(), U_PARSE_CONTEXT_LEN-1);
     r.extract(0, len, parseError.preContext);
     parseError.preContext[len] = 0;
     //for post-context
     r.truncate(0);
     rule2.toRule(r, FALSE);
     len = uprv_min(r.length(), U_PARSE_CONTEXT_LEN-1);
     r.extract(0, len, parseError.postContext);
     parseError.postContext[len] = 0;
 }
 U_NAMESPACE_BEGIN
 /**
  * Construct a new empty rule set.
  */
 TransliterationRuleSet::TransliterationRuleSet(UErrorCode& status) : UMemory() {
     ruleVector = new UVector(&_deleteRule, NULL, status);
     if (U_FAILURE(status)) {
         return;
     }
     if (ruleVector == NULL) {
         status = U_MEMORY_ALLOCATION_ERROR;
     }
     rules = NULL;
     maxContextLength = 0;
 }
 /**
  * Copy constructor.
  */
 TransliterationRuleSet::TransliterationRuleSet(const TransliterationRuleSet& other) :
     UMemory(other),
     ruleVector(0),
     rules(0),
     maxContextLength(other.maxContextLength) {
     int32_t i, len;
     uprv_memcpy(index, other.index, sizeof(index));
     UErrorCode status = U_ZERO_ERROR;
     ruleVector = new UVector(&_deleteRule, NULL, status);
     if (other.ruleVector != 0 && ruleVector != 0 && U_SUCCESS(status)) {
         len = other.ruleVector->size();
         for (i=0; i<len && U_SUCCESS(status); ++i) {
             TransliterationRule *tempTranslitRule = new TransliterationRule(*(TransliterationRule*)other.ruleVector->elementAt(i));
             // Null pointer test
             if (tempTranslitRule == NULL) {
                 status = U_MEMORY_ALLOCATION_ERROR;
                 break;
             }
             ruleVector->addElement(tempTranslitRule, status);
             if (U_FAILURE(status)) {
                 break;
             }
         }
     }
     if (other.rules != 0 && U_SUCCESS(status)) {
         UParseError p;
         freeze(p, status);
     }
 }
 /**
  * Destructor.
  */
 TransliterationRuleSet::~TransliterationRuleSet() {
     delete ruleVector; // This deletes the contained rules
     uprv_free(rules);
 }
 void TransliterationRuleSet::setData(const TransliterationRuleData* d) {
     /**
      * We assume that the ruleset has already been frozen.
      */
     int32_t len = index[256]; // see freeze()
     for (int32_t i=0; i<len; ++i) {
         rules[i]->setData(d);
     }
 }
 /**
  * Return the maximum context length.
  * @return the length of the longest preceding context.
  */
 int32_t TransliterationRuleSet::getMaximumContextLength(void) const {
     return maxContextLength;
 }
 /**
  * Add a rule to this set.  Rules are added in order, and order is
  * significant.  The last call to this method must be followed by
  * a call to <code>freeze()</code> before the rule set is used.
  *
  * <p>If freeze() has already been called, calling addRule()
  * unfreezes the rules, and freeze() must be called again.
  *
  * @param adoptedRule the rule to add
  */
 void TransliterationRuleSet::addRule(TransliterationRule* adoptedRule,
                                      UErrorCode& status) {
     if (U_FAILURE(status)) {
         delete adoptedRule;
         return;
     }
     ruleVector->addElement(adoptedRule, status);
     int32_t len;
     if ((len = adoptedRule->getContextLength()) > maxContextLength) {
         maxContextLength = len;
     }
     uprv_free(rules);
     rules = 0;
 }
 /**
  * Check this for masked rules and index it to optimize performance.
  * The sequence of operations is: (1) add rules to a set using
  * <code>addRule()</code>; (2) freeze the set using
  * <code>freeze()</code>; (3) use the rule set.  If
  * <code>addRule()</code> is called after calling this method, it
  * invalidates this object, and this method must be called again.
  * That is, <code>freeze()</code> may be called multiple times,
  * although for optimal performance it shouldn't be.
  */
 void TransliterationRuleSet::freeze(UParseError& parseError,UErrorCode& status) {
     /* Construct the rule array and index table.  We reorder the
      * rules by sorting them into 256 bins.  Each bin contains all
      * rules matching the index value for that bin.  A rule
      * matches an index value if string whose first key character
      * has a low byte equal to the index value can match the rule.
      *
      * Each bin contains zero or more rules, in the same order
      * they were found originally.  However, the total rules in
      * the bins may exceed the number in the original vector,
      * since rules that have a variable as their first key
      * character will generally fall into more than one bin.
      *
      * That is, each bin contains all rules that either have that
      * first index value as their first key character, or have
      * a set containing the index value as their first character.
      */
     int32_t n = ruleVector->size();
     int32_t j;
     int16_t x;
     UVector v(2*n, status); // heuristic; adjust as needed
     if (U_FAILURE(status)) {
         return;
     }
     /* Precompute the index values.  This saves a LOT of time.
      * Be careful not to call malloc(0).
      */
     int16_t* indexValue = (int16_t*) uprv_malloc( sizeof(int16_t) * (n > 0 ? n : 1) );
     /* test for NULL */
     if (indexValue == 0) {
         status = U_MEMORY_ALLOCATION_ERROR;
         return;
     }
     for (j=0; j<n; ++j) {
         TransliterationRule* r = (TransliterationRule*) ruleVector->elementAt(j);
         indexValue[j] = r->getIndexValue();
     }
     for (x=0; x<256; ++x) {
         index[x] = v.size();
         for (j=0; j<n; ++j) {
             if (indexValue[j] >= 0) {
                 if (indexValue[j] == x) {
                     v.addElement(ruleVector->elementAt(j), status);
                 }
             } else {
                 // If the indexValue is < 0, then the first key character is
                 // a set, and we must use the more time-consuming
                 // matchesIndexValue check.  In practice this happens
                 // rarely, so we seldom tread this code path.
                 TransliterationRule* r = (TransliterationRule*) ruleVector->elementAt(j);
                 if (r->matchesIndexValue((uint8_t)x)) {
                     v.addElement(r, status);
                 }
             }
         }
     }
     uprv_free(indexValue);
     index[256] = v.size();
     /* Freeze things into an array.
      */
     uprv_free(rules); // Contains alias pointers
     /* You can't do malloc(0)! */
     if (v.size() == 0) {
         rules = NULL;
         return;
     }
     rules = (TransliterationRule **)uprv_malloc(v.size() * sizeof(TransliterationRule *));
     /* test for NULL */
     if (rules == 0) {
         status = U_MEMORY_ALLOCATION_ERROR;
         return;
     }
     for (j=0; j<v.size(); ++j) {
         rules[j] = (TransliterationRule*) v.elementAt(j);
     }
     // TODO Add error reporting that indicates the rules that
     //      are being masked.
     //UnicodeString errors;
     /* Check for masking.  This is MUCH faster than our old check,
      * which was each rule against each following rule, since we
      * only have to check for masking within each bin now.  It's
      * 256*O(n2^2) instead of O(n1^2), where n1 is the total rule
      * count, and n2 is the per-bin rule count.  But n2<<n1, so
      * it's a big win.
      */
     for (x=0; x<256; ++x) {
         for (j=index[x]; j<index[x+1]-1; ++j) {
             TransliterationRule* r1 = rules[j];
             for (int32_t k=j+1; k<index[x+1]; ++k) {
                 TransliterationRule* r2 = rules[k];
                 if (r1->masks(*r2)) {
 //|                 if (errors == null) {
 //|                     errors = new StringBuffer();
 //|                 } else {
 //|                     errors.append("\n");
 //|                 }
 //|                 errors.append("Rule " + r1 + " masks " + r2);
                     status = U_RULE_MASK_ERROR;
                     maskingError(*r1, *r2, parseError);
                     return;
                 }
             }
         }
     }
     //if (errors != null) {
     //    throw new IllegalArgumentException(errors.toString());
     //}
 }
 /**
  * Transliterate the given text with the given UTransPosition
  * indices.  Return TRUE if the transliteration should continue
  * or FALSE if it should halt (because of a U_PARTIAL_MATCH match).
  * Note that FALSE is only ever returned if isIncremental is TRUE.
  * @param text the text to be transliterated
  * @param pos the position indices, which will be updated
  * @param incremental if TRUE, assume new text may be inserted
  * at index.limit, and return FALSE if thre is a partial match.
  * @return TRUE unless a U_PARTIAL_MATCH has been obtained,
  * indicating that transliteration should stop until more text
  * arrives.
  */
 UBool TransliterationRuleSet::transliterate(Replaceable& text,
                                             UTransPosition& pos,
                                             UBool incremental) {
     int16_t indexByte = (int16_t) (text.char32At(pos.start) & 0xFF);
     for (int32_t i=index[indexByte]; i<index[indexByte+1]; ++i) {
         UMatchDegree m = rules[i]->matchAndReplace(text, pos, incremental);
         switch (m) {
         case U_MATCH:
             _debugOut("match", rules[i], text, pos);
             return TRUE;
         case U_PARTIAL_MATCH:
             _debugOut("partial match", rules[i], text, pos);
             return FALSE;
         default: /* Ram: added default to make GCC happy */
             break;
         }
     }
     // No match or partial match from any rule
     pos.start += U16_LENGTH(text.char32At(pos.start));
     _debugOut("no match", NULL, text, pos);
     return TRUE;
 }
 /**
  * Create rule strings that represents this rule set.
  */
 UnicodeString& TransliterationRuleSet::toRules(UnicodeString& ruleSource,
                                                UBool escapeUnprintable) const {
     int32_t i;
     int32_t count = ruleVector->size();
     ruleSource.truncate(0);
     for (i=0; i<count; ++i) {
         if (i != 0) {
             ruleSource.append((UChar) 0x000A /*\n*/);
         }
         TransliterationRule *r =
             (TransliterationRule*) ruleVector->elementAt(i);
         r->toRule(ruleSource, escapeUnprintable);
     }
     return ruleSource;
 }
 /**
  * Return the set of all characters that may be modified
  * (getTarget=false) or emitted (getTarget=true) by this set.
  */
 UnicodeSet& TransliterationRuleSet::getSourceTargetSet(UnicodeSet& result,
                                UBool getTarget) const
 {
     result.clear();
     int32_t count = ruleVector->size();
     for (int32_t i=0; i<count; ++i) {
         TransliterationRule* r =
             (TransliterationRule*) ruleVector->elementAt(i);
         if (getTarget) {
             r->addTargetSetTo(result);
         } else {
             r->addSourceSetTo(result);
         }
     }
     return result;
 }
 U_NAMESPACE_END
 #endif /* #if !UCONFIG_NO_TRANSLITERATION */

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intl/icu/source/i18n/rbt_set.cpp@b8a032363ba2 (annotated)

intl/icu/source/i18n/rbt_set.cpp