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+// © 2016 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+/*
+******************************************************************************
+*
+*   Copyright (C) 2008-2016, International Business Machines
+*   Corporation and others.  All Rights Reserved.
+*
+******************************************************************************
+*   file name:  uspoof_conf.h
+*   encoding:   UTF-8
+*   tab size:   8 (not used)
+*   indentation:4
+*
+*   created on: 2009Jan05
+*   created by: Andy Heninger
+*
+*   Internal classes for compiling confusable data into its binary (runtime) form.
+*/
+
+#ifndef __USPOOF_BUILDCONF_H__
+#define __USPOOF_BUILDCONF_H__
+
+#include "unicode/utypes.h"
+
+#if !UCONFIG_NO_NORMALIZATION
+
+#if !UCONFIG_NO_REGULAR_EXPRESSIONS
+
+#include "unicode/uregex.h"
+#include "uhash.h"
+#include "uspoof_impl.h"
+
+U_NAMESPACE_BEGIN
+
+// SPUString
+//              Holds a string that is the result of one of the mappings defined
+//              by the confusable mapping data (confusables.txt from Unicode.org)
+//              Instances of SPUString exist during the compilation process only.
+
+struct SPUString : public UMemory {
+    UnicodeString  *fStr;             // The actual string.
+    int32_t         fCharOrStrTableIndex;   // Index into the final runtime data for this
+                                      // string (or, for length 1, the single string char
+                                      // itself, there being no string table entry for it.)
+    SPUString(UnicodeString *s);
+    ~SPUString();
+};
+
+
+//  String Pool   A utility class for holding the strings that are the result of
+//                the spoof mappings.  These strings will utimately end up in the
+//                run-time String Table.
+//                This is sort of like a sorted set of strings, except that ICU's anemic
+//                built-in collections don't support those, so it is implemented with a
+//                combination of a uhash and a UVector.
+
+
+class SPUStringPool : public UMemory {
+  public:
+    SPUStringPool(UErrorCode &status);
+    ~SPUStringPool();
+
+    // Add a string. Return the string from the table.
+    // If the input parameter string is already in the table, delete the
+    //  input parameter and return the existing string.
+    SPUString *addString(UnicodeString *src, UErrorCode &status);
+
+
+    // Get the n-th string in the collection.
+    SPUString *getByIndex(int32_t i);
+
+    // Sort the contents; affects the ordering of getByIndex().
+    void sort(UErrorCode &status);
+
+    int32_t size();
+
+  private:
+    UVector     *fVec;    // Elements are SPUString *
+    UHashtable  *fHash;   // Key: UnicodeString  Value: SPUString
+};
+
+
+// class ConfusabledataBuilder
+//     An instance of this class exists while the confusable data is being built from source.
+//     It encapsulates the intermediate data structures that are used for building.
+//     It exports one static function, to do a confusable data build.
+
+class ConfusabledataBuilder : public UMemory {
+  private:
+    SpoofImpl  *fSpoofImpl;
+    UChar      *fInput;
+    UHashtable *fTable;
+    UnicodeSet *fKeySet;     // A set of all keys (UChar32s) that go into the four mapping tables.
+
+    // The binary data is first assembled into the following four collections, then
+    //   copied to its final raw-memory destination.
+    UVector            *fKeyVec;
+    UVector            *fValueVec;
+    UnicodeString      *fStringTable;
+
+    SPUStringPool      *stringPool;
+    URegularExpression *fParseLine;
+    URegularExpression *fParseHexNum;
+    int32_t             fLineNum;
+
+    ConfusabledataBuilder(SpoofImpl *spImpl, UErrorCode &status);
+    ~ConfusabledataBuilder();
+    void build(const char * confusables, int32_t confusablesLen, UErrorCode &status);
+
+    // Add an entry to the key and value tables being built
+    //   input:  data from SLTable, MATable, etc.
+    //   outut:  entry added to fKeyVec and fValueVec
+    void addKeyEntry(UChar32     keyChar,     // The key character
+                     UHashtable *table,       // The table, one of SATable, MATable, etc.
+                     int32_t     tableFlag,   // One of USPOOF_SA_TABLE_FLAG, etc.
+                     UErrorCode &status);
+
+    // From an index into fKeyVec & fValueVec
+    //   get a UnicodeString with the corresponding mapping.
+    UnicodeString getMapping(int32_t index);
+
+    // Populate the final binary output data array with the compiled data.
+    void outputData(UErrorCode &status);
+
+  public:
+    static void buildConfusableData(SpoofImpl *spImpl, const char * confusables,
+        int32_t confusablesLen, int32_t *errorType, UParseError *pe, UErrorCode &status);
+};
+U_NAMESPACE_END
+
+#endif
+#endif  // !UCONFIG_NO_REGULAR_EXPRESSIONS
+#endif  // __USPOOF_BUILDCONF_H__