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jdk/src/java.base/share/classes/sun/text/bidi/BidiRun.java

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  38  */
  39 
  40 package sun.text.bidi;
  41 
  42 /**
  43  * A BidiRun represents a sequence of characters at the same embedding level.
  44  * The Bidi algorithm decomposes a piece of text into sequences of characters
  45  * at the same embedding level, each such sequence is called a "run".
  46  *
  47  * <p>A BidiRun represents such a run by storing its essential properties,
  48  * but does not duplicate the characters which form the run.
  49  *
  50  * <p>The &quot;limit&quot; of the run is the position just after the
  51  * last character, i.e., one more than that position.
  52  *
  53  * <p>This class has no public constructor, and its members cannot be
  54  * modified by users.
  55  *
  56  * @see com.ibm.icu.text.Bidi
  57  */
  58 public class BidiRun {
  59 
  60     int start;              /* first logical position of the run */
  61     int limit;              /* last visual position of the run +1 */
  62     int insertRemove;       /* if >0, flags for inserting LRM/RLM before/after run,
  63                                if <0, count of bidi controls within run            */
  64     byte level;
  65 
  66     /*
  67      * Default constructor
  68      *
  69      * Note that members start and limit of a run instance have different
  70      * meanings depending whether the run is part of the runs array of a Bidi
  71      * object, or if it is a reference returned by getVisualRun() or
  72      * getLogicalRun().
  73      * For a member of the runs array of a Bidi object,
  74      *   - start is the first logical position of the run in the source text.
  75      *   - limit is one after the last visual position of the run.
  76      * For a reference returned by getLogicalRun() or getVisualRun(),
  77      *   - start is the first logical position of the run in the source text.
  78      *   - limit is one after the last logical position of the run.


  89     {
  90         this.start = start;
  91         this.limit = limit;
  92         this.level = embeddingLevel;
  93     }
  94 
  95     /*
  96      * Copy the content of a BidiRun instance
  97      */
  98     void copyFrom(BidiRun run)
  99     {
 100         this.start = run.start;
 101         this.limit = run.limit;
 102         this.level = run.level;
 103         this.insertRemove = run.insertRemove;
 104     }
 105 
 106     /**
 107      * Get level of run
 108      */
 109     public byte getEmbeddingLevel()
 110     {
 111         return level;
 112     }
 113 
 114     /**
 115      * Check if run level is even
 116      * @return true if the embedding level of this run is even, i.e. it is a
 117      *  left-to-right run.
 118      */
 119     boolean isEvenRun()
 120     {
 121         return (level & 1) == 0;
 122     }
 123 
 124 }


  38  */
  39 
  40 package sun.text.bidi;
  41 
  42 /**
  43  * A BidiRun represents a sequence of characters at the same embedding level.
  44  * The Bidi algorithm decomposes a piece of text into sequences of characters
  45  * at the same embedding level, each such sequence is called a "run".
  46  *
  47  * <p>A BidiRun represents such a run by storing its essential properties,
  48  * but does not duplicate the characters which form the run.
  49  *
  50  * <p>The &quot;limit&quot; of the run is the position just after the
  51  * last character, i.e., one more than that position.
  52  *
  53  * <p>This class has no public constructor, and its members cannot be
  54  * modified by users.
  55  *
  56  * @see com.ibm.icu.text.Bidi
  57  */
  58 class BidiRun {
  59 
  60     int start;              /* first logical position of the run */
  61     int limit;              /* last visual position of the run +1 */
  62     int insertRemove;       /* if >0, flags for inserting LRM/RLM before/after run,
  63                                if <0, count of bidi controls within run            */
  64     byte level;
  65 
  66     /*
  67      * Default constructor
  68      *
  69      * Note that members start and limit of a run instance have different
  70      * meanings depending whether the run is part of the runs array of a Bidi
  71      * object, or if it is a reference returned by getVisualRun() or
  72      * getLogicalRun().
  73      * For a member of the runs array of a Bidi object,
  74      *   - start is the first logical position of the run in the source text.
  75      *   - limit is one after the last visual position of the run.
  76      * For a reference returned by getLogicalRun() or getVisualRun(),
  77      *   - start is the first logical position of the run in the source text.
  78      *   - limit is one after the last logical position of the run.


  89     {
  90         this.start = start;
  91         this.limit = limit;
  92         this.level = embeddingLevel;
  93     }
  94 
  95     /*
  96      * Copy the content of a BidiRun instance
  97      */
  98     void copyFrom(BidiRun run)
  99     {
 100         this.start = run.start;
 101         this.limit = run.limit;
 102         this.level = run.level;
 103         this.insertRemove = run.insertRemove;
 104     }
 105 
 106     /**
 107      * Get level of run
 108      */
 109     byte getEmbeddingLevel()
 110     {
 111         return level;
 112     }
 113 
 114     /**
 115      * Check if run level is even
 116      * @return true if the embedding level of this run is even, i.e. it is a
 117      *  left-to-right run.
 118      */
 119     boolean isEvenRun()
 120     {
 121         return (level & 1) == 0;
 122     }
 123 
 124 }
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