Using_SCAN

   This section contains some basic examples that illustrate what
   SCA can do to help you with your programs. The examples have very
   little explanation. If you want a more detailed explanation of the
   underlying concepts, see the Basic_Query_Concepts help topic. The
   remainder of this section is written in terms that are specific to
   SCAN programs.

   If you want to follow along and try the examples, you will need to
   have an SCA library available. If you do not know how to create
   an SCA library, read the Building_An_SCA_Library help topic. The
   examples use generic variable names (such as i). You will have to
   substitute variable names that actually exist in your code when
   trying the examples.

   The first example is the easiest query: It lets you find all the
   items in your SCA library named i, and shows you all the places
   where they appear (all occurrences of i).

   FIND i

   You can search for any name in this manner, including using
   wildcard characters (for example, FIND i*).

   Now let's say you are looking for an occurrence, and you know
   that it occurs in a particular file. The following query finds all
   occurrences of items that are named i but will then limit them to
   those which happen to occur in the file named 'PROG.SCN'.

   FIND i AND FILE_SPEC="PROG.SCN"

   Another typical question one might ask is "Find all the places
   where this item is assigned to (or read from, called, declared,
   and so forth)." The next example finds all occurrences of items
   that are named i, but then limits them to only those occurrences
   where i is assigned a value.

   FIND i AND OCCURRENCE=WRITE

   (SCA understands many occurrence classes other then WRITE. See the
   help subtopics under Getting_Started for tables containing all the
   SCA attributes and their corresponding meanings in SCAN.)

   Often, you only want to know where (in what file or module) a
   particular procedure is, so that you can go to it and edit it.
   You could use the first query (where i would be the name of the
   procedure) and then look through the output. The output would
   include all occurrences of the procedure, one of which would be
   its declaration, which you could then select. Or, you could ask
   SCA to limit the search for you by typing the following query:

   FIND i AND OCCURRENCE=PRIMARY

   In SCA terms, a primary declaration is the most significant
   declaration of an item. For a SCAN procedure, this means the
   place where the procedure is actually implemented, that is, the
   PROCEDURE declaration. This is in contrast to FORWARD or EXTERNAL
   declarations, which are associated declarations

   Another problem you might have is that there are many different
   items in your system having a given name. Some may be variables;
   others may be procedures, constants, labels, and so forth. Suppose
   you want to find only the procedures named i. Again, the query
   FIND i would give you what you wanted, but it would also give you
   much more. It is preferable to issue the following query:

   FIND i AND SYMBOL_CLASS=PROCEDURE

   The last four examples have all selected information based on two
   attributes. The last example selected information based on a name
   attribute (in this case, i) and a symbol class attribute (in this
   case, PROCEDURE). Note how the attributes are combined using the
   boolean operator AND. In general, you can select items out of your
   library based on any combination of attributes, using AND as well
   as the other logical operators OR, XOR and NOT.

   The next example shows another primary feature of SCA - the
   ability to display relationships between items. The example
   given here shows the most common use of this feature. It finds
   the complete call tree (that is, all procedures called directly
   and indirectly), of the procedure named i.

   FIND CALLED_BY (i, DEPTH=ALL)

   If you want to limit the depth of the call tree, you can replace
   the keyword ALL by any positive integer.

   The final part of this section describes how to go directly to the
   source code once you have issued a query. After issuing the query
   FIND i, for example, you can have an LSE query buffer containing
   something that looks like the following:

     I variable
         SCAN_MODULE\60     variable declaration
         SCAN_MODULE\75     write reference
         SCAN_MODULE\79     read reference
         SCAN_MODULE\122    read reference
         SCAN_MODULE\144    write reference
         SCAN_MODULE\146    read reference
         SCAN_MODULE\149    write reference
         SCAN_MODULE\149    read reference
         SCAN_MODULE\150    read reference
         SCAN_MODULE\166    read reference

   The first two lines of this display will be highlighted. The first
   line represents the item you looked for (i), and the rest of the
   lines represent the different places in the code where this item
   occurred (that is, the occurrences of i). By using the up and down
   arrows on your keyboard, or by clicking on an occurrence with your
   mouse, you can choose the occurrence you want to see. Then all
   you have to do is type CTRL/G (the keyboard equivalent of the GOTO
   SOURCE command), and LSE will bring the source file into a buffer
   and position you at the occurrence you chose.

   To obtain help on the following topics, request help as indicated.

   o  For help on query language, see the Basic_Query_Concepts help
      topic.

   o  For help on libraries, see the Building_An_SCA_Library help
      topic.