ABAP/4 ОКМ ДМ экономическая информатика 4GL Теория и практика обработки информации

Компьютерный язык ABAP/4 - ключевые слова

SHIFT

Variants

1. SHIFT c.
2. SHIFT c BY n PLACES.
3. SHIFT c UP TO c1.
4. SHIFT c LEFT DELETING LEADING c1.
5. SHIFT c RIGHT DELETING TRAILING c1.

Variant 1

SHIFT c.

Additions

1. ... CIRCULAR
2. ... RIGHT
3. ... LEFT

Effect

Shifts the field c one position to the left. Omits the first letter and inserts a blank on the right.

Example


DATA ALPHABET(10) VALUE 'ABCDEFGHIJ'.
SHIFT ALPHABET.

ALPHABET now contains 'BCDEFGHIJ ' .

Addition 1

... CIRCULAR

Effect

Shifts the field c , so that the "lost" character on the left appears on the right.

Example


DATA ALPHABET(10) VALUE 'ABCDEFGHIJ'.
SHIFT ALPHABET CIRCULAR.

ALPHABET now contains 'BCDEFGHIJA' .

Addition 2

... RIGHT

Effect

Shifts the field c to the right instead of the left.

Example


DATA ALPHABET(10) VALUE 'ABCDEFGHIJ'.
SHIFT ALPHABET RIGHT CIRCULAR.

ALPHABET now contains 'JABCDEFGHI' . The additional specifications can also be combined.

Addition 3

... LEFT

Effect

Shifts the field c to the left. Since this is the default, you can omit this addition.

Variant 2

SHIFT c BY n PLACES.

Additions

Similar to variant 1.

Effect

Shifts the field c by n positions to the left and inserts blanks on the right.

Example


DATA ALPHABET(10) VALUE 'ABCDEFGHIJ',
     FIVE TYPE I  VALUE 5.
SHIFT ALPHABET BY FIVE PLACES.

ALPHABET now contains 'FGHIJ ' .

Note

If n = 0 or has a negative value, c remains unchanged.
If n is greater than the field length of c , c is padded with blanks.

Variant 3

SHIFT c UP TO c1.

Additions

Similar to variant 1.

Effect

Searches c for the character string in c1 (starting on the left!). If it finds a match, it shifts the contents of c to the left until the character string concerned appears on the left. If no match is found, c remains unchanged.

The return code value is set as follows:

SY-SUBRC = 0 c1 was found in c .
SY_SUBRC = 4 c1 was not found in c ; c remains unchanged.

Example


DATA ALPHABET(10) VALUE 'ABCDEFGHIJ',
     THREE(3)     VALUE    'DEF',
     FOUR(4)      VALUE    'DEF '.
SHIFT ALPHABET UP TO FOUR.

SY-SUBRC is now set to 4 and the field ALPHABET remains unchanged.


SHIFT ALPHABET UP TO THREE CIRCULAR.

SY-SUBRC is now set to 0 and the field ALPHABET contains 'DEFGHIJABC'.

Note

The operation searches c for the full length of the string in c1 , together with any existing blanks.

Variant 4

SHIFT c LEFT DELETING LEADING c1.

Variant 5

SHIFT c RIGHT DELETING TRAILING c1.

Effect

Shifts the field c to the left or right so that it begins or ends with a character which occurs in c1 and pads it with blanks accordingly.
If c does not begin or end with a character from c1 , c remains unchanged.

Example


DATA: ALPHABET(15) VALUE '     ABCDEFGHIJ',
      M1(4)        VALUE 'ABCD',
      M2(6)        VALUE 'BJJCA '.
SHIFT ALPHABET LEFT DELETING LEADING M1.

The field ALPHABET is unchanged.


SHIFT ALPHABET LEFT DELETING LEADING SPACE.

The field ALPHABET now contains 'ABCDEFGHIJ ' .


SHIFT ALPHABET RIGHT DELETING TRAILING M2.

The field ALPHABET now contains ' ABCDEFGHI' .

Note

Performance
The use of the SHIFT command in WHILE loops should be avoided for performance reasons.
Shifting a field one position to the right or left requires approx. 5 msn (standardized microseconds), while cyclical shifting requires approx. 7 msn. The variant ... LEFT DELETING LEADING ... needs about 3,5 msn, the variant ...RIGHT DELETING TRAILING ... about 4,5 msn.
Related CONCATENATE , SEARCH , SPLIT

Index
© SAP AG 1996

ABAP/4 ОКМ ДМ экономическая информатика 4GL Теория и практика обработки информации

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