Package org.variantsync.diffdetective.feature.cpp

Class CPPDiffLineFormulaExtractor

java.lang.Object

org.variantsync.diffdetective.feature.AbstractingFormulaExtractor

org.variantsync.diffdetective.feature.cpp.CPPDiffLineFormulaExtractor

All Implemented Interfaces:

DiffLineFormulaExtractor

Direct Known Subclasses:

MarlinCPPDiffLineFormulaExtractor

public class CPPDiffLineFormulaExtractor
extends AbstractingFormulaExtractor

Extracts the expression from a C preprocessor statement. For example, given the annotation "#if defined(A) || B()", the extractor would extract "A || B". The extractor detects if, ifdef, ifndef and elif annotations. (Other annotations do not have expressions.) The given pre-processor statement might also a line in a diff (i.e., preceeded by a - or +).

Author:

Paul Bittner, Sören Viegener, Benjamin Moosherr, Alexander Schultheiß

Field Summary

Fields

Modifier and Type	Field	Description
private static final Pattern	CPP_ANNOTATION_PATTERN
private static final String	CPP_ANNOTATION_REGEX

Constructor Summary

Constructors

Constructor	Description
CPPDiffLineFormulaExtractor()

Method Summary

Modifier and Type	Method	Description
protected String	abstractFormula(String formula)	Abstract the given formula.
String	extractFormula(String line)	Extracts the feature formula as a string from a macro line (possibly within a diff).

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.variantsync.diffdetective.feature.DiffLineFormulaExtractor

resolveFeatureMacroFunctions

Field Details

CPP_ANNOTATION_REGEX

private static final String CPP_ANNOTATION_REGEX

See Also:

• Constant Field Values

CPP_ANNOTATION_PATTERN

private static final Pattern CPP_ANNOTATION_PATTERN

Constructor Details

CPPDiffLineFormulaExtractor

public CPPDiffLineFormulaExtractor()

Method Details

extractFormula

public String extractFormula(String line)
                      throws UnparseableFormulaException

Extracts the feature formula as a string from a macro line (possibly within a diff).

Specified by:

extractFormula in interface DiffLineFormulaExtractor

Overrides:

extractFormula in class AbstractingFormulaExtractor

Parameters:

line - The line of which to get the feature mapping

Returns:

The feature mapping as a String of the given line

Throws:

UnparseableFormulaException

abstractFormula

protected String abstractFormula(String formula)

Abstract the given formula.

First, the visitor uses ANTLR to parse the formula into a parse tree gives the tree to a ControllingCExpressionVisitor. The visitor traverses the tree starting from the root, searching for subtrees that must be abstracted. If such a subtree is found, the visitor calls an AbstractingCExpressionVisitor to abstract the part of the formula in the subtree.

Specified by:

abstractFormula in class AbstractingFormulaExtractor

Parameters:

formula - that is to be abstracted

Returns:

the abstracted formula