diff options
Diffstat (limited to 'Emby.Server.Implementations/TextEncoding/UniversalDetector/Core/HebrewProber.cs')
| -rw-r--r-- | Emby.Server.Implementations/TextEncoding/UniversalDetector/Core/HebrewProber.cs | 130 |
1 files changed, 65 insertions, 65 deletions
diff --git a/Emby.Server.Implementations/TextEncoding/UniversalDetector/Core/HebrewProber.cs b/Emby.Server.Implementations/TextEncoding/UniversalDetector/Core/HebrewProber.cs index 92974d3a8..2cbf33075 100644 --- a/Emby.Server.Implementations/TextEncoding/UniversalDetector/Core/HebrewProber.cs +++ b/Emby.Server.Implementations/TextEncoding/UniversalDetector/Core/HebrewProber.cs @@ -21,7 +21,7 @@ * Contributor(s): * Shy Shalom <shooshX@gmail.com> * Rudi Pettazzi <rudi.pettazzi@gmail.com> (C# port) - * + * * Alternatively, the contents of this file may be used under the terms of * either the GNU General Public License Version 2 or later (the "GPL"), or * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), @@ -43,40 +43,40 @@ using System; * * Four main charsets exist in Hebrew: * "ISO-8859-8" - Visual Hebrew - * "windows-1255" - Logical Hebrew + * "windows-1255" - Logical Hebrew * "ISO-8859-8-I" - Logical Hebrew * "x-mac-hebrew" - ?? Logical Hebrew ?? * * Both "ISO" charsets use a completely identical set of code points, whereas - * "windows-1255" and "x-mac-hebrew" are two different proper supersets of + * "windows-1255" and "x-mac-hebrew" are two different proper supersets of * these code points. windows-1255 defines additional characters in the range - * 0x80-0x9F as some misc punctuation marks as well as some Hebrew-specific + * 0x80-0x9F as some misc punctuation marks as well as some Hebrew-specific * diacritics and additional 'Yiddish' ligature letters in the range 0xc0-0xd6. - * x-mac-hebrew defines similar additional code points but with a different + * x-mac-hebrew defines similar additional code points but with a different * mapping. * - * As far as an average Hebrew text with no diacritics is concerned, all four - * charsets are identical with respect to code points. Meaning that for the - * main Hebrew alphabet, all four map the same values to all 27 Hebrew letters + * As far as an average Hebrew text with no diacritics is concerned, all four + * charsets are identical with respect to code points. Meaning that for the + * main Hebrew alphabet, all four map the same values to all 27 Hebrew letters * (including final letters). * * The dominant difference between these charsets is their directionality. * "Visual" directionality means that the text is ordered as if the renderer is - * not aware of a BIDI rendering algorithm. The renderer sees the text and - * draws it from left to right. The text itself when ordered naturally is read + * not aware of a BIDI rendering algorithm. The renderer sees the text and + * draws it from left to right. The text itself when ordered naturally is read * backwards. A buffer of Visual Hebrew generally looks like so: * "[last word of first line spelled backwards] [whole line ordered backwards - * and spelled backwards] [first word of first line spelled backwards] + * and spelled backwards] [first word of first line spelled backwards] * [end of line] [last word of second line] ... etc' " * adding punctuation marks, numbers and English text to visual text is * naturally also "visual" and from left to right. - * + * * "Logical" directionality means the text is ordered "naturally" according to - * the order it is read. It is the responsibility of the renderer to display - * the text from right to left. A BIDI algorithm is used to place general + * the order it is read. It is the responsibility of the renderer to display + * the text from right to left. A BIDI algorithm is used to place general * punctuation marks, numbers and English text in the text. * - * Texts in x-mac-hebrew are almost impossible to find on the Internet. From + * Texts in x-mac-hebrew are almost impossible to find on the Internet. From * what little evidence I could find, it seems that its general directionality * is Logical. * @@ -84,17 +84,17 @@ using System; * charsets: * Visual Hebrew - "ISO-8859-8" - backwards text - Words and sentences are * backwards while line order is natural. For charset recognition purposes - * the line order is unimportant (In fact, for this implementation, even + * the line order is unimportant (In fact, for this implementation, even * word order is unimportant). * Logical Hebrew - "windows-1255" - normal, naturally ordered text. * - * "ISO-8859-8-I" is a subset of windows-1255 and doesn't need to be + * "ISO-8859-8-I" is a subset of windows-1255 and doesn't need to be * specifically identified. * "x-mac-hebrew" is also identified as windows-1255. A text in x-mac-hebrew * that contain special punctuation marks or diacritics is displayed with * some unconverted characters showing as question marks. This problem might * be corrected using another model prober for x-mac-hebrew. Due to the fact - * that x-mac-hebrew texts are so rare, writing another model prober isn't + * that x-mac-hebrew texts are so rare, writing another model prober isn't * worth the effort and performance hit. * * *** The Prober *** @@ -136,7 +136,7 @@ using System; */ namespace UniversalDetector.Core { - + /// <summary> /// This prober doesn't actually recognize a language or a charset. /// It is a helper prober for the use of the Hebrew model probers @@ -165,49 +165,49 @@ namespace UniversalDetector.Core protected const string VISUAL_HEBREW_NAME = "ISO-8859-8"; protected const string LOGICAL_HEBREW_NAME = "windows-1255"; - + // owned by the group prober. protected CharsetProber logicalProber, visualProber; - protected int finalCharLogicalScore, finalCharVisualScore; - + protected int finalCharLogicalScore, finalCharVisualScore; + // The two last bytes seen in the previous buffer. protected byte prev, beforePrev; - + public HebrewProber() { Reset(); } - - public void SetModelProbers(CharsetProber logical, CharsetProber visual) - { - logicalProber = logical; - visualProber = visual; + + public void SetModelProbers(CharsetProber logical, CharsetProber visual) + { + logicalProber = logical; + visualProber = visual; } - - /** + + /** * Final letter analysis for logical-visual decision. - * Look for evidence that the received buffer is either logical Hebrew or + * Look for evidence that the received buffer is either logical Hebrew or * visual Hebrew. * The following cases are checked: - * 1) A word longer than 1 letter, ending with a final letter. This is an - * indication that the text is laid out "naturally" since the final letter + * 1) A word longer than 1 letter, ending with a final letter. This is an + * indication that the text is laid out "naturally" since the final letter * really appears at the end. +1 for logical score. * 2) A word longer than 1 letter, ending with a Non-Final letter. In normal * Hebrew, words ending with Kaf, Mem, Nun, Pe or Tsadi, should not end with * the Non-Final form of that letter. Exceptions to this rule are mentioned * above in isNonFinal(). This is an indication that the text is laid out * backwards. +1 for visual score - * 3) A word longer than 1 letter, starting with a final letter. Final letters - * should not appear at the beginning of a word. This is an indication that + * 3) A word longer than 1 letter, starting with a final letter. Final letters + * should not appear at the beginning of a word. This is an indication that * the text is laid out backwards. +1 for visual score. * - * The visual score and logical score are accumulated throughout the text and + * The visual score and logical score are accumulated throughout the text and * are finally checked against each other in GetCharSetName(). * No checking for final letters in the middle of words is done since that case * is not an indication for either Logical or Visual text. * * The input buffer should not contain any white spaces that are not (' ') - * or any low-ascii punctuation marks. + * or any low-ascii punctuation marks. */ public override ProbingState HandleData(byte[] buf, int offset, int len) { @@ -218,31 +218,31 @@ namespace UniversalDetector.Core int max = offset + len; for (int i = offset; i < max; i++) { - + byte b = buf[i]; - + // a word just ended if (b == 0x20) { // *(curPtr-2) was not a space so prev is not a 1 letter word if (beforePrev != 0x20) { // case (1) [-2:not space][-1:final letter][cur:space] - if (IsFinal(prev)) + if (IsFinal(prev)) finalCharLogicalScore++; - // case (2) [-2:not space][-1:Non-Final letter][cur:space] + // case (2) [-2:not space][-1:Non-Final letter][cur:space] else if (IsNonFinal(prev)) finalCharVisualScore++; } - + } else { // case (3) [-2:space][-1:final letter][cur:not space] - if ((beforePrev == 0x20) && (IsFinal(prev)) && (b != ' ')) + if ((beforePrev == 0x20) && (IsFinal(prev)) && (b != ' ')) ++finalCharVisualScore; } beforePrev = prev; prev = b; } - // Forever detecting, till the end or until both model probers + // Forever detecting, till the end or until both model probers // return NotMe (handled above). return ProbingState.Detecting; } @@ -252,7 +252,7 @@ namespace UniversalDetector.Core { // If the final letter score distance is dominant enough, rely on it. int finalsub = finalCharLogicalScore - finalCharVisualScore; - if (finalsub >= MIN_FINAL_CHAR_DISTANCE) + if (finalsub >= MIN_FINAL_CHAR_DISTANCE) return LOGICAL_HEBREW_NAME; if (finalsub <= -(MIN_FINAL_CHAR_DISTANCE)) return VISUAL_HEBREW_NAME; @@ -263,9 +263,9 @@ namespace UniversalDetector.Core return LOGICAL_HEBREW_NAME; if (modelsub < -(MIN_MODEL_DISTANCE)) return VISUAL_HEBREW_NAME; - + // Still no good, back to final letter distance, maybe it'll save the day. - if (finalsub < 0) + if (finalsub < 0) return VISUAL_HEBREW_NAME; // (finalsub > 0 - Logical) or (don't know what to do) default to Logical. @@ -280,10 +280,10 @@ namespace UniversalDetector.Core beforePrev = 0x20; } - public override ProbingState GetState() + public override ProbingState GetState() { // Remain active as long as any of the model probers are active. - if (logicalProber.GetState() == ProbingState.NotMe && + if (logicalProber.GetState() == ProbingState.NotMe && visualProber.GetState() == ProbingState.NotMe) return ProbingState.NotMe; return ProbingState.Detecting; @@ -293,31 +293,31 @@ namespace UniversalDetector.Core { //Console.WriteLine(" HEB: {0} - {1} [Logical-Visual score]", finalCharLogicalScore, finalCharVisualScore); } - + public override float GetConfidence() - { + { return 0.0f; } - + protected static bool IsFinal(byte b) { - return (b == FINAL_KAF || b == FINAL_MEM || b == FINAL_NUN - || b == FINAL_PE || b == FINAL_TSADI); + return (b == FINAL_KAF || b == FINAL_MEM || b == FINAL_NUN + || b == FINAL_PE || b == FINAL_TSADI); } - + protected static bool IsNonFinal(byte b) { - // The normal Tsadi is not a good Non-Final letter due to words like - // 'lechotet' (to chat) containing an apostrophe after the tsadi. This - // apostrophe is converted to a space in FilterWithoutEnglishLetters causing - // the Non-Final tsadi to appear at an end of a word even though this is not + // The normal Tsadi is not a good Non-Final letter due to words like + // 'lechotet' (to chat) containing an apostrophe after the tsadi. This + // apostrophe is converted to a space in FilterWithoutEnglishLetters causing + // the Non-Final tsadi to appear at an end of a word even though this is not // the case in the original text. - // The letters Pe and Kaf rarely display a related behavior of not being a - // good Non-Final letter. Words like 'Pop', 'Winamp' and 'Mubarak' for - // example legally end with a Non-Final Pe or Kaf. However, the benefit of - // these letters as Non-Final letters outweighs the damage since these words - // are quite rare. - return (b == NORMAL_KAF || b == NORMAL_MEM || b == NORMAL_NUN + // The letters Pe and Kaf rarely display a related behavior of not being a + // good Non-Final letter. Words like 'Pop', 'Winamp' and 'Mubarak' for + // example legally end with a Non-Final Pe or Kaf. However, the benefit of + // these letters as Non-Final letters outweighs the damage since these words + // are quite rare. + return (b == NORMAL_KAF || b == NORMAL_MEM || b == NORMAL_NUN || b == NORMAL_PE); } } |