GSoC: Move scrptrun header and source file out of unx

Scrptrun class will be used by the new layout engine for script
itemisation. It will need to be compiled on all platforms. Therefore
move the header and source file to vcl/inc/ and vcl/source/gdi/
respectively.

Change-Id: If4e1e0e76ffb94f9d0ca08f7d5f9982dd907c1c6

1 files changed, 234 insertions, 0 deletions

diff --git a/vcl/source/gdi/scrptrun.cxx b/vcl/source/gdi/scrptrun.cxx
new file mode 100644
index 000000000000..d6557d79a894
--- /dev/null
+++ b/vcl/source/gdi/scrptrun.cxx
@@ -0,0 +1,234 @@
+/*
+ *******************************************************************************
+ *
+ *   Copyright (c) 1995-2013 International Business Machines Corporation and others
+ *
+ *   All rights reserved.
+ *
+ *   Permission is hereby granted, free of charge, to any person obtaining a copy of
+ *   this software and associated documentation files (the "Software"), to deal in
+ *   the Software without restriction, including without limitation the rights to
+ *   use, copy, modify, merge, publish, distribute, and/or sell copies of the
+ *   Software, and to permit persons to whom the Software is furnished to do so,
+ *   provided that the above copyright notice(s) and this permission notice appear
+ *   in all copies of the Software and that both the above copyright notice(s) and
+ *   this permission notice appear in supporting documentation.
+ *
+ *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. IN
+ *   NO EVENT SHALL THE COPYRIGHT HOLDER OR HOLDERS INCLUDED IN THIS NOTICE BE
+ *   LIABLE FOR ANY CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY
+ *   DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ *   ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ *   CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ *   Except as contained in this notice, the name of a copyright holder shall not be
+ *   used in advertising or otherwise to promote the sale, use or other dealings in
+ *   this Software without prior written authorization of the copyright holder.
+ *
+ *******************************************************************************
+ *   file name:  scrptrun.cpp
+ *
+ *   created on: 10/17/2001
+ *   created by: Eric R. Mader
+ */
+/**
+  * This file is largely copied from the ICU project,
+  * under folder source/extra/scrptrun/scrptrun.cpp
+  */
+#include "unicode/utypes.h"
+#include "unicode/uscript.h"
+
+#include "scrptrun.h"
+#include <algorithm>
+
+namespace {
+
+struct PairIndices
+{
+    int8_t ma00[0xff];
+    int8_t ma20[0x7f];
+    int8_t ma30[0x7f];
+
+    PairIndices()
+    {
+        std::fill_n(ma00, 0xff, -1);
+        std::fill_n(ma20, 0x7f, -1);
+        std::fill_n(ma30, 0x7f, -1);
+
+        // characters in the range 0x0000 - 0x007e (inclusive)
+        // ascii paired punctuation
+        ma00[0x28] =  0;
+        ma00[0x29] =  1;
+        ma00[0x3c] =  2;
+        ma00[0x3e] =  3;
+        ma00[0x5b] =  4;
+        ma00[0x5d] =  5;
+        ma00[0x7b] =  6;
+        ma00[0x7d] =  7;
+        // guillemets
+        ma00[0xab] =  8;
+        ma00[0xbb] =  9;
+
+        // characters in the range 0x2000 - 0x207e (inclusive)
+        // general punctuation
+        ma20[0x18] = 10;
+        ma20[0x19] = 11;
+        ma20[0x1c] = 12;
+        ma20[0x1d] = 13;
+        ma20[0x39] = 14;
+        ma20[0x3a] = 15;
+
+        // characters in the range 0x3000 - 0x307e (inclusive)
+        // chinese paired punctuation
+        ma30[0x08] = 16;
+        ma30[0x09] = 17;
+        ma30[0x0a] = 18;
+        ma30[0x0b] = 19;
+        ma30[0x0c] = 20;
+        ma30[0x0d] = 21;
+        ma30[0x0e] = 22;
+        ma30[0x0f] = 23;
+        ma30[0x10] = 24;
+        ma30[0x11] = 25;
+        ma30[0x14] = 26;
+        ma30[0x15] = 27;
+        ma30[0x16] = 28;
+        ma30[0x17] = 29;
+        ma30[0x18] = 30;
+        ma30[0x19] = 31;
+        ma30[0x1a] = 32;
+        ma30[0x1b] = 33;
+    }
+
+    inline int32_t getPairIndex(UChar32 ch) const
+    {
+        if (ch < 0xff)
+            return ma00[ch];
+        if (ch >= 0x2000 && ch < 0x207f)
+            return ma20[ch - 0x2000];
+        if (ch >= 0x3000 && ch < 0x307f)
+            return ma30[ch - 0x3000];
+        return -1;
+    }
+
+};
+
+}
+
+static const PairIndices gPairIndices;
+
+
+namespace vcl {
+
+const char ScriptRun::fgClassID=0;
+
+static inline UBool sameScript(int32_t scriptOne, int32_t scriptTwo)
+{
+    return scriptOne <= USCRIPT_INHERITED || scriptTwo <= USCRIPT_INHERITED || scriptOne == scriptTwo;
+}
+
+UBool ScriptRun::next()
+{
+    int32_t startSP  = parenSP;  // used to find the first new open character
+    UErrorCode error = U_ZERO_ERROR;
+
+    // if we've fallen off the end of the text, we're done
+    if (scriptEnd >= charLimit) {
+        return false;
+    }
+
+    scriptCode = USCRIPT_COMMON;
+
+    for (scriptStart = scriptEnd; scriptEnd < charLimit; scriptEnd += 1) {
+        UChar   high = charArray[scriptEnd];
+        UChar32 ch   = high;
+
+        // if the character is a high surrogate and it's not the last one
+        // in the text, see if it's followed by a low surrogate
+        if (high >= 0xD800 && high <= 0xDBFF && scriptEnd < charLimit - 1)
+        {
+            UChar low = charArray[scriptEnd + 1];
+
+            // if it is followed by a low surrogate,
+            // consume it and form the full character
+            if (low >= 0xDC00 && low <= 0xDFFF) {
+                ch = (high - 0xD800) * 0x0400 + low - 0xDC00 + 0x10000;
+                scriptEnd += 1;
+            }
+        }
+
+        UScriptCode sc = uscript_getScript(ch, &error);
+        int32_t pairIndex = gPairIndices.getPairIndex(ch);
+
+        // Paired character handling:
+
+        // if it's an open character, push it onto the stack.
+        // if it's a close character, find the matching open on the
+        // stack, and use that script code. Any non-matching open
+        // characters above it on the stack will be poped.
+        if (pairIndex >= 0) {
+            if ((pairIndex & 1) == 0) {
+                ++parenSP;
+                int32_t nVecSize = parenStack.size();
+                if (parenSP == nVecSize)
+                    parenStack.resize(nVecSize + 128);
+                parenStack[parenSP].pairIndex = pairIndex;
+                parenStack[parenSP].scriptCode  = scriptCode;
+            } else if (parenSP >= 0) {
+                int32_t pi = pairIndex & ~1;
+
+                while (parenSP >= 0 && parenStack[parenSP].pairIndex != pi) {
+                    parenSP -= 1;
+                }
+
+                if (parenSP < startSP) {
+                    startSP = parenSP;
+                }
+
+                if (parenSP >= 0) {
+                    sc = parenStack[parenSP].scriptCode;
+                }
+            }
+        }
+
+        if (sameScript(scriptCode, sc)) {
+            if (scriptCode <= USCRIPT_INHERITED && sc > USCRIPT_INHERITED) {
+                scriptCode = sc;
+
+                // now that we have a final script code, fix any open
+                // characters we pushed before we knew the script code.
+                while (startSP < parenSP) {
+                    parenStack[++startSP].scriptCode = scriptCode;
+                }
+            }
+
+            // if this character is a close paired character,
+            // pop it from the stack
+            if (pairIndex >= 0 && (pairIndex & 1) != 0 && parenSP >= 0) {
+                parenSP -= 1;
+                /* decrement startSP only if it is >= 0,
+                   decrementing it unnecessarily will lead to memory corruption
+                   while processing the above while block.
+                   e.g. startSP = -4 , parenSP = -1
+                */
+                if (startSP >= 0) {
+                    startSP -= 1;
+                }
+            }
+        } else {
+            // if the run broke on a surrogate pair,
+            // end it before the high surrogate
+            if (ch >= 0x10000) {
+                scriptEnd -= 1;
+            }
+
+            break;
+        }
+    }
+
+    return true;
+}
+
+}