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The initial version of the metrics tool should compute the
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following metrics for each user-defined unit in the Context:
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- the total number of statements in the code of the unit;
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- the total number of declarations in the code of the unit;
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Add to the initial version of the metrics tool computation for the
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- the total number of simple statements (that is, statements
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which do not contain some other statement as its subcomponent);
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- the total number of compound statements (that is,
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statements which do contain other some statement as its
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- the total number of all the names explicitly declared in the
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The subdirectory 'task_1' contains four files:
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- actuals_for_traversing-pre_op.adb - actual Pre-Operation to
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instantiate Traverse_Element, this file should replace the file
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with the same name in ASIS Application Templates to get the
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- unit_processing.adb - the modified version of the
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unit_processing.adb file from the ASIS Application templates; the
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modification consists of adding the calls to subprograms which
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reset and print out the data structures used to collect metrics
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values. This file is the same for the solutions of Task 1 and
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- metrics_utilities.ads and metrics_utilities.adb - the package
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Metrics_Utilities, contains the data structures to
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collect metrics information and the procedures for printing this
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information out and to reset these data structures before
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processing the next unit.
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The subdirectory 'task_2' contains three files:
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- actuals_for_traversing-pre_op.adb - actual Pre-Operation to
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instantiate Traverse_Element, this file should replace the file
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with the same name in ASIS Application Templates to get the
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solution for Task 2, it is the extended version of the same
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file from subdirectory 'task_1', and it contains the code for
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computing new metrics information, as required by Task 2.
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- metrics_utilities.ads and metrics_utilities.adb - the package
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Metrics_Utilities, updated to collect and output the new
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metrics information as required by Task 2
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To solve Task 1, you have to provide the real code for actual
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Pre-Operation for Traverse_Element (this code should collect the
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metrics information) and to add the calls to some procedures which
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reset and which output the metrics values to the procedure providing
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the general processing of a Compilation Unit (in the ASIS Application
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Templates this is the Unit_Processing.Process_Unit). You have to
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modify the general unit processing routine because you can only
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collect the metrics information when traversing the unit structure,
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and you have to reset the metrics data structures to the initial
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values before starting the traversal, and you can print out the
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metrics values only when the traversal is over.
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The metrics to collect are very simple. In Pre-Operation, you have to
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detect the kind of the Element being visited, and if it is a
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statement or a declaration, you have to add 1 to the corresponding
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Hints for Task 2 are given as comments in the solution for Task 1
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(file task_1/actuals_for_traversing-pre_op.adb).
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tutorial/using_templets/metrics/README
