diff options
Diffstat (limited to 'plugins/org.eclipse.xtend/src/org/eclipse/internal/xtend/util/internal/icu/CharsetRecog_mbcs.java')
| -rw-r--r-- | plugins/org.eclipse.xtend/src/org/eclipse/internal/xtend/util/internal/icu/CharsetRecog_mbcs.java | 539 |
1 files changed, 539 insertions, 0 deletions
diff --git a/plugins/org.eclipse.xtend/src/org/eclipse/internal/xtend/util/internal/icu/CharsetRecog_mbcs.java b/plugins/org.eclipse.xtend/src/org/eclipse/internal/xtend/util/internal/icu/CharsetRecog_mbcs.java new file mode 100644 index 00000000..59306e5e --- /dev/null +++ b/plugins/org.eclipse.xtend/src/org/eclipse/internal/xtend/util/internal/icu/CharsetRecog_mbcs.java @@ -0,0 +1,539 @@ +package org.eclipse.internal.xtend.util.internal.icu; +/** +This code was taken from the com.ibm.icu library (3.6.1). We needed to copy it to have not +a dependency to this large library only the need of charset recognition. +(KTH 2007-07-30) + +The com.ibm.icu library is published under Eclipse Public License V1.0. + */ + +/* + **************************************************************************** + * Copyright (C) 2005-2006, International Business Machines Corporation and * + * others. All Rights Reserved. * + **************************************************************************** + * + */ + +import java.util.Arrays; + +/** + * CharsetRecognizer implemenation for Asian - double or multi-byte - charsets. + * Match is determined mostly by the input data adhering to the + * encoding scheme for the charset, and, optionally, + * frequency-of-occurence of characters. + * <p/> + * Instances of this class are singletons, one per encoding + * being recognized. They are created in the main + * CharsetDetector class and kept in the global list of available + * encodings to be checked. The specific encoding being recognized + * is determined by subclass. + * + * @internal + */ +abstract class CharsetRecog_mbcs extends CharsetRecognizer { + + /** + * Get the IANA name of this charset. + * @return the charset name. + */ + abstract String getName() ; + + + /** + * Test the match of this charset with the input text data + * which is obtained via the CharsetDetector object. + * + * @param det The CharsetDetector, which contains the input text + * to be checked for being in this charset. + * @return Two values packed into one int (Damn java, anyhow) + * <br/> + * bits 0-7: the match confidence, ranging from 0-100 + * <br/> + * bits 8-15: The match reason, an enum-like value. + */ + int match(CharsetDetector det, int [] commonChars) { + int singleByteCharCount = 0; + int doubleByteCharCount = 0; + int commonCharCount = 0; + int badCharCount = 0; + int totalCharCount = 0; + int confidence = 0; + iteratedChar iter = new iteratedChar(); + + detectBlock: { + for (iter.reset(); nextChar(iter, det);) { + totalCharCount++; + if (iter.error) { + badCharCount++; + } else { + + if (iter.charValue <= 0xff) { + singleByteCharCount++; + } else { + doubleByteCharCount++; + if (commonChars != null) { + if (Arrays.binarySearch(commonChars, iter.charValue) >= 0) { + commonCharCount++; + } + } + } + } + if (badCharCount >= 2 && badCharCount*5 >= doubleByteCharCount) { + // Bail out early if the byte data is not matching the encoding scheme. + break detectBlock; + } + } + + if (doubleByteCharCount <= 10 && badCharCount== 0) { + // Not many multi-byte chars. + // ASCII or ISO file? It's probably not our encoding, + // but is not incompatible with our encoding, so don't give it a zero. + confidence = 10; + break detectBlock; + } + + // + // No match if there are too many characters that don't fit the encoding scheme. + // (should we have zero tolerance for these?) + // + if (doubleByteCharCount < 20*badCharCount) { + confidence = 0; + break detectBlock; + } + + if (commonChars == null) { + // We have no statistics on frequently occuring characters. + // Assess confidence purely on having a reasonable number of + // multi-byte characters (the more the better + confidence = 30 + doubleByteCharCount - 20*badCharCount; + if (confidence > 100) { + confidence = 100; + } + }else { + // + // Frequency of occurence statistics exist. + // + double maxVal = Math.log((float)doubleByteCharCount / 4); + double scaleFactor = 90.0 / maxVal; + confidence = (int)(Math.log(commonCharCount+1) * scaleFactor + 10); + confidence = Math.min(confidence, 100); + } + } // end of detectBlock: + + return confidence; + } + + // "Character" iterated character class. + // Recognizers for specific mbcs encodings make their "characters" available + // by providing a nextChar() function that fills in an instance of iteratedChar + // with the next char from the input. + // The returned characters are not converted to Unicode, but remain as the raw + // bytes (concatenated into an int) from the codepage data. + // + // For Asian charsets, use the raw input rather than the input that has been + // stripped of markup. Detection only considers multi-byte chars, effectively + // stripping markup anyway, and double byte chars do occur in markup too. + // + static class iteratedChar { + int charValue = 0; // 1-4 bytes from the raw input data + int index = 0; + int nextIndex = 0; + boolean error = false; + boolean done = false; + + void reset() { + charValue = 0; + index = -1; + nextIndex = 0; + error = false; + done = false; + } + + int nextByte(CharsetDetector det) { + if (nextIndex >= det.fRawLength) { + done = true; + return -1; + } + int byteValue = (int)det.fRawInput[nextIndex++] & 0x00ff; + return byteValue; + } + } + + /** + * Get the next character (however many bytes it is) from the input data + * Subclasses for specific charset encodings must implement this function + * to get characters according to the rules of their encoding scheme. + * + * This function is not a method of class iteratedChar only because + * that would require a lot of extra derived classes, which is awkward. + * @param it The iteratedChar "struct" into which the returned char is placed. + * @param det The charset detector, which is needed to get at the input byte data + * being iterated over. + * @return True if a character was returned, false at end of input. + */ + abstract boolean nextChar(iteratedChar it, CharsetDetector det); + + + + + + /** + * Shift-JIS charset recognizer. + * + */ + static class CharsetRecog_sjis extends CharsetRecog_mbcs { + static int [] commonChars = + // TODO: This set of data comes from the character frequency- + // of-occurence analysis tool. The data needs to be moved + // into a resource and loaded from there. + {0x8140, 0x8141, 0x8142, 0x8145, 0x815b, 0x8169, 0x816a, 0x8175, 0x8176, 0x82a0, + 0x82a2, 0x82a4, 0x82a9, 0x82aa, 0x82ab, 0x82ad, 0x82af, 0x82b1, 0x82b3, 0x82b5, + 0x82b7, 0x82bd, 0x82be, 0x82c1, 0x82c4, 0x82c5, 0x82c6, 0x82c8, 0x82c9, 0x82cc, + 0x82cd, 0x82dc, 0x82e0, 0x82e7, 0x82e8, 0x82e9, 0x82ea, 0x82f0, 0x82f1, 0x8341, + 0x8343, 0x834e, 0x834f, 0x8358, 0x835e, 0x8362, 0x8367, 0x8375, 0x8376, 0x8389, + 0x838a, 0x838b, 0x838d, 0x8393, 0x8e96, 0x93fa, 0x95aa}; + + boolean nextChar(iteratedChar it, CharsetDetector det) { + it.index = it.nextIndex; + it.error = false; + int firstByte; + firstByte = it.charValue = it.nextByte(det); + if (firstByte < 0) { + return false; + } + + if (firstByte <= 0x7f || (firstByte>0xa0 && firstByte<=0xdf)) { + return true; + } + + int secondByte = it.nextByte(det); + if (secondByte < 0) { + return false; + } + it.charValue = (firstByte << 8) | secondByte; + if (! ((secondByte>=0x40 && secondByte<=0x7f) || (secondByte>=0x80 && secondByte<=0xff))) { + // Illegal second byte value. + it.error = true; + } + return true; + } + + int match(CharsetDetector det) { + return match(det, commonChars); + } + + String getName() { + return "Shift_JIS"; + } + + public String getLanguage() + { + return "ja"; + } + + + } + + + /** + * Big5 charset recognizer. + * + */ + static class CharsetRecog_big5 extends CharsetRecog_mbcs { + static int [] commonChars = + // TODO: This set of data comes from the character frequency- + // of-occurence analysis tool. The data needs to be moved + // into a resource and loaded from there. + {0xa140, 0xa141, 0xa142, 0xa143, 0xa147, 0xa149, 0xa175, 0xa176, 0xa440, 0xa446, + 0xa447, 0xa448, 0xa451, 0xa454, 0xa457, 0xa464, 0xa46a, 0xa46c, 0xa477, 0xa4a3, + 0xa4a4, 0xa4a7, 0xa4c1, 0xa4ce, 0xa4d1, 0xa4df, 0xa4e8, 0xa4fd, 0xa540, 0xa548, + 0xa558, 0xa569, 0xa5cd, 0xa5e7, 0xa657, 0xa661, 0xa662, 0xa668, 0xa670, 0xa6a8, + 0xa6b3, 0xa6b9, 0xa6d3, 0xa6db, 0xa6e6, 0xa6f2, 0xa740, 0xa751, 0xa759, 0xa7da, + 0xa8a3, 0xa8a5, 0xa8ad, 0xa8d1, 0xa8d3, 0xa8e4, 0xa8fc, 0xa9c0, 0xa9d2, 0xa9f3, + 0xaa6b, 0xaaba, 0xaabe, 0xaacc, 0xaafc, 0xac47, 0xac4f, 0xacb0, 0xacd2, 0xad59, + 0xaec9, 0xafe0, 0xb0ea, 0xb16f, 0xb2b3, 0xb2c4, 0xb36f, 0xb44c, 0xb44e, 0xb54c, + 0xb5a5, 0xb5bd, 0xb5d0, 0xb5d8, 0xb671, 0xb7ed, 0xb867, 0xb944, 0xbad8, 0xbb44, + 0xbba1, 0xbdd1, 0xc2c4, 0xc3b9, 0xc440, 0xc45f}; + + boolean nextChar(iteratedChar it, CharsetDetector det) { + it.index = it.nextIndex; + it.error = false; + int firstByte; + firstByte = it.charValue = it.nextByte(det); + if (firstByte < 0) { + return false; + } + + if (firstByte <= 0x7f || firstByte==0xff) { + // single byte character. + return true; + } + + int secondByte = it.nextByte(det); + if (secondByte < 0) { + return false; + } + it.charValue = (it.charValue << 8) | secondByte; + + if (secondByte < 0x40 || + secondByte ==0x7f || + secondByte == 0xff) { + it.error = true; + } + return true; + } + + int match(CharsetDetector det) { + return match(det, commonChars); + } + + String getName() { + return "Big5"; + } + + + public String getLanguage() + { + return "zh"; + } + } + + + /** + * EUC charset recognizers. One abstract class that provides the common function + * for getting the next character according to the EUC encoding scheme, + * and nested derived classes for EUC_KR, EUC_JP, EUC_CN. + * + */ + abstract static class CharsetRecog_euc extends CharsetRecog_mbcs { + + /* + * (non-Javadoc) + * Get the next character value for EUC based encodings. + * Character "value" is simply the raw bytes that make up the character + * packed into an int. + */ + boolean nextChar(iteratedChar it, CharsetDetector det) { + it.index = it.nextIndex; + it.error = false; + int firstByte = 0; + int secondByte = 0; + int thirdByte = 0; + //int fourthByte = 0; + + buildChar: { + firstByte = it.charValue = it.nextByte(det); + if (firstByte < 0) { + // Ran off the end of the input data + it.done = true; + break buildChar; + } + if (firstByte <= 0x8d) { + // single byte char + break buildChar; + } + + secondByte = it.nextByte(det); + it.charValue = (it.charValue << 8) | secondByte; + + if (firstByte >= 0xA1 && firstByte <= 0xfe) { + // Two byte Char + if (secondByte < 0xa1) { + it.error = true; + } + break buildChar; + } + if (firstByte == 0x8e) { + // Code Set 2. + // In EUC-JP, total char size is 2 bytes, only one byte of actual char value. + // In EUC-TW, total char size is 4 bytes, three bytes contribute to char value. + // We don't know which we've got. + // Treat it like EUC-JP. If the data really was EUC-TW, the following two + // bytes will look like a well formed 2 byte char. + if (secondByte < 0xa1) { + it.error = true; + } + break buildChar; + } + + if (firstByte == 0x8f) { + // Code set 3. + // Three byte total char size, two bytes of actual char value. + thirdByte = it.nextByte(det); + it.charValue = (it.charValue << 8) | thirdByte; + if (thirdByte < 0xa1) { + it.error = true; + } + } + } + + return (it.done == false); + } + + /** + * The charset recognize for EUC-JP. A singleton instance of this class + * is created and kept by the public CharsetDetector class + */ + static class CharsetRecog_euc_jp extends CharsetRecog_euc { + static int [] commonChars = + // TODO: This set of data comes from the character frequency- + // of-occurence analysis tool. The data needs to be moved + // into a resource and loaded from there. + {0xa1a1, 0xa1a2, 0xa1a3, 0xa1a6, 0xa1bc, 0xa1ca, 0xa1cb, 0xa1d6, 0xa1d7, 0xa4a2, + 0xa4a4, 0xa4a6, 0xa4a8, 0xa4aa, 0xa4ab, 0xa4ac, 0xa4ad, 0xa4af, 0xa4b1, 0xa4b3, + 0xa4b5, 0xa4b7, 0xa4b9, 0xa4bb, 0xa4bd, 0xa4bf, 0xa4c0, 0xa4c1, 0xa4c3, 0xa4c4, + 0xa4c6, 0xa4c7, 0xa4c8, 0xa4c9, 0xa4ca, 0xa4cb, 0xa4ce, 0xa4cf, 0xa4d0, 0xa4de, + 0xa4df, 0xa4e1, 0xa4e2, 0xa4e4, 0xa4e8, 0xa4e9, 0xa4ea, 0xa4eb, 0xa4ec, 0xa4ef, + 0xa4f2, 0xa4f3, 0xa5a2, 0xa5a3, 0xa5a4, 0xa5a6, 0xa5a7, 0xa5aa, 0xa5ad, 0xa5af, + 0xa5b0, 0xa5b3, 0xa5b5, 0xa5b7, 0xa5b8, 0xa5b9, 0xa5bf, 0xa5c3, 0xa5c6, 0xa5c7, + 0xa5c8, 0xa5c9, 0xa5cb, 0xa5d0, 0xa5d5, 0xa5d6, 0xa5d7, 0xa5de, 0xa5e0, 0xa5e1, + 0xa5e5, 0xa5e9, 0xa5ea, 0xa5eb, 0xa5ec, 0xa5ed, 0xa5f3, 0xb8a9, 0xb9d4, 0xbaee, + 0xbbc8, 0xbef0, 0xbfb7, 0xc4ea, 0xc6fc, 0xc7bd, 0xcab8, 0xcaf3, 0xcbdc, 0xcdd1}; + String getName() { + return "EUC-JP"; + } + + int match(CharsetDetector det) { + return match(det, commonChars); + } + + public String getLanguage() + { + return "ja"; + } + } + + /** + * The charset recognize for EUC-KR. A singleton instance of this class + * is created and kept by the public CharsetDetector class + */ + static class CharsetRecog_euc_kr extends CharsetRecog_euc { + static int [] commonChars = + // TODO: This set of data comes from the character frequency- + // of-occurence analysis tool. The data needs to be moved + // into a resource and loaded from there. + {0xb0a1, 0xb0b3, 0xb0c5, 0xb0cd, 0xb0d4, 0xb0e6, 0xb0ed, 0xb0f8, 0xb0fa, 0xb0fc, + 0xb1b8, 0xb1b9, 0xb1c7, 0xb1d7, 0xb1e2, 0xb3aa, 0xb3bb, 0xb4c2, 0xb4cf, 0xb4d9, + 0xb4eb, 0xb5a5, 0xb5b5, 0xb5bf, 0xb5c7, 0xb5e9, 0xb6f3, 0xb7af, 0xb7c2, 0xb7ce, + 0xb8a6, 0xb8ae, 0xb8b6, 0xb8b8, 0xb8bb, 0xb8e9, 0xb9ab, 0xb9ae, 0xb9cc, 0xb9ce, + 0xb9fd, 0xbab8, 0xbace, 0xbad0, 0xbaf1, 0xbbe7, 0xbbf3, 0xbbfd, 0xbcad, 0xbcba, + 0xbcd2, 0xbcf6, 0xbdba, 0xbdc0, 0xbdc3, 0xbdc5, 0xbec6, 0xbec8, 0xbedf, 0xbeee, + 0xbef8, 0xbefa, 0xbfa1, 0xbfa9, 0xbfc0, 0xbfe4, 0xbfeb, 0xbfec, 0xbff8, 0xc0a7, + 0xc0af, 0xc0b8, 0xc0ba, 0xc0bb, 0xc0bd, 0xc0c7, 0xc0cc, 0xc0ce, 0xc0cf, 0xc0d6, + 0xc0da, 0xc0e5, 0xc0fb, 0xc0fc, 0xc1a4, 0xc1a6, 0xc1b6, 0xc1d6, 0xc1df, 0xc1f6, + 0xc1f8, 0xc4a1, 0xc5cd, 0xc6ae, 0xc7cf, 0xc7d1, 0xc7d2, 0xc7d8, 0xc7e5, 0xc8ad}; + + String getName() { + return "EUC-KR"; + } + + int match(CharsetDetector det) { + return match(det, commonChars); + } + + public String getLanguage() + { + return "ko"; + } + } + } + + /** + * + * GB-18030 recognizer. Uses simplified Chinese statistics. + * + */ + static class CharsetRecog_gb_18030 extends CharsetRecog_mbcs { + + /* + * (non-Javadoc) + * Get the next character value for EUC based encodings. + * Character "value" is simply the raw bytes that make up the character + * packed into an int. + */ + boolean nextChar(iteratedChar it, CharsetDetector det) { + it.index = it.nextIndex; + it.error = false; + int firstByte = 0; + int secondByte = 0; + int thirdByte = 0; + int fourthByte = 0; + + buildChar: { + firstByte = it.charValue = it.nextByte(det); + + if (firstByte < 0) { + // Ran off the end of the input data + it.done = true; + break buildChar; + } + + if (firstByte <= 0x80) { + // single byte char + break buildChar; + } + + secondByte = it.nextByte(det); + it.charValue = (it.charValue << 8) | secondByte; + + if (firstByte >= 0x81 && firstByte <= 0xFE) { + // Two byte Char + if ((secondByte >= 0x40 && secondByte <= 0x7E) || (secondByte >=80 && secondByte <=0xFE)) { + break buildChar; + } + + // Four byte char + if (secondByte >= 0x30 && secondByte <= 0x39) { + thirdByte = it.nextByte(det); + + if (thirdByte >= 0x81 && thirdByte <= 0xFE) { + fourthByte = it.nextByte(det); + + if (fourthByte >= 0x30 && fourthByte <= 0x39) { + it.charValue = (it.charValue << 16) | (thirdByte << 8) | fourthByte; + break buildChar; + } + } + } + + it.error = true; + break buildChar; + } + } + + return (it.done == false); + } + + static int [] commonChars = + // TODO: This set of data comes from the character frequency- + // of-occurence analysis tool. The data needs to be moved + // into a resource and loaded from there. + {0xa1a1, 0xa1a2, 0xa1a3, 0xa1a4, 0xa1b0, 0xa1b1, 0xa1f1, 0xa1f3, 0xa3a1, 0xa3ac, + 0xa3ba, 0xb1a8, 0xb1b8, 0xb1be, 0xb2bb, 0xb3c9, 0xb3f6, 0xb4f3, 0xb5bd, 0xb5c4, + 0xb5e3, 0xb6af, 0xb6d4, 0xb6e0, 0xb7a2, 0xb7a8, 0xb7bd, 0xb7d6, 0xb7dd, 0xb8b4, + 0xb8df, 0xb8f6, 0xb9ab, 0xb9c9, 0xb9d8, 0xb9fa, 0xb9fd, 0xbacd, 0xbba7, 0xbbd6, + 0xbbe1, 0xbbfa, 0xbcbc, 0xbcdb, 0xbcfe, 0xbdcc, 0xbecd, 0xbedd, 0xbfb4, 0xbfc6, + 0xbfc9, 0xc0b4, 0xc0ed, 0xc1cb, 0xc2db, 0xc3c7, 0xc4dc, 0xc4ea, 0xc5cc, 0xc6f7, + 0xc7f8, 0xc8ab, 0xc8cb, 0xc8d5, 0xc8e7, 0xc9cf, 0xc9fa, 0xcab1, 0xcab5, 0xcac7, + 0xcad0, 0xcad6, 0xcaf5, 0xcafd, 0xccec, 0xcdf8, 0xceaa, 0xcec4, 0xced2, 0xcee5, + 0xcfb5, 0xcfc2, 0xcfd6, 0xd0c2, 0xd0c5, 0xd0d0, 0xd0d4, 0xd1a7, 0xd2aa, 0xd2b2, + 0xd2b5, 0xd2bb, 0xd2d4, 0xd3c3, 0xd3d0, 0xd3fd, 0xd4c2, 0xd4da, 0xd5e2, 0xd6d0}; + + + String getName() { + return "GB18030"; + } + + int match(CharsetDetector det) { + return match(det, commonChars); + } + + public String getLanguage() + { + return "zh"; + } + } + + +} |