Module #02.02.04 : Deletion of structure elements

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DESCRIPTION: This module tests the ability of the programmer to
delete elements within an open and closed structure.

SEMANTIC REQUIREMENTS:


SR1.   <Delete element> deletes the element pointed to by the
`element pointer.'
#F 122
#D 7.3 4.3
#S 4.4.4/29/3
#T P01/3 P01/5 P01/7 P05/1 
SR2.   If <delete element> is used, and if the element position
is zero nothing is deleted.
#F 122
#D 7.3 4.3
#S 4.4.4/29/3
#T P01/1 
SR3.   <Delete element range> deletes all structure elements
between and including the lower element position and the higher
element position.
#F 123
#D 7.3
#S 4.4.4/29/3
#T P02/1 P02/2 P02/4 P02/6 P02/8 P02/10 P05/3 
SR4.   If <delete element range> is used, and if an element
position is less than 1, a value of 0 is used; if an element
position is greater than the number of elements in the open
structure, a value pointing to the last element in the structure
is used.
#F 123
#D 7.3
#S 4.4.4/29/3
#T P02/6 P02/8 P02/10 
SR5.   <Delete elements between labels> deletes elements between
but not including the occurrences of two specified labels.
#F 124
#D 7.3 7.3.5
#S 4.4.4/29/3
#T P03/1 P03/3 P03/5 P03/7 P05/5 
SR6.   For <delete elements between labels>, the labels specified
by label-identifier 1 and 2 are those found by successive forward
searches, starting from the position following the element
pointer.
#F 124
#D 7.3.5 4.3
#S 4.4.4/29/3
#T P03/1 P03/3 P03/5 P03/7 P05/5 
SR7.   Following all three delete functions, the `element
pointer' is positioned at the element immediately preceding the
element, or group of elements, which was deleted.  If no element
is deleted, the `element pointer' is unchanged.
#F 122 123 124
#D 7.3 4.3
#S 4.4.4/29/3
#T P01/2 P01/4 P01/6 P01/8 P02/3 P02/5 P02/7 P02/9 P02/11 P03/2 P03/4
#T P03/6 P03/8 P05/2 P05/4 P05/6 
SR8.   <Empty structure> deletes all elements of a specified open
or closed structure.
#F 125
#D 7.1 7.3
#S 4.4.4/29/4
#T P04/1 P04/3 P05/7 
SR9.   After using <empty structure> on a specified structure,
the specified structure will exist.
#F 125
#D 7.1
#S 4.4.4/29/4
#T P04/1 P04/3 P05/7 
SR10.  After using <empty structure> on a specified structure,
references to the now empty structure remain intact.
#F 125
#D 7.1 7.3.4
#S 4.4.4/29/4
#T P04/2 P04/4 
SR11.  If <empty structure> is used on a specified open
structure, the `element pointer' is set to 0.
#F 125
#D 7.1 7.3 4.3
#S 4.4.4/29/4
#T P04/5 
LOCAL DICTIONARY:

  Functions ---
  122: pdel    <delete element>
  123: pdelra  <delete element range>
  124: pdellb  <delete elements between labels>
  125: pemst   <empty structure>
 
  Data Structures ---
  4  ...  phigs_state_list
  4.3  ...  element_pointer
  7  ...  structure_state_list
  7.1  ...  structure_identifier
  7.3  ...  list_of_structure_elements
  7.3.4  ...  execute_structure
  7.3.5  ...  label
 
SEMANTIC CROSS-REFERENCES:
  02.01.01/SR02





PROGRAM 1:
Delete element

You may inspect either the
design or
code for this program.

PROGRAM 2:
Delete element range

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design or
code for this program.

PROGRAM 3:
Delete elements between labels

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design or
code for this program.

PROGRAM 4:
Empty structure

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design or
code for this program.

PROGRAM 5:
Deleting structure elements in REPLACE edit mode

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design or
code for this program.

End of documentation for 02.02.04