Package org.variantsync.diffdetective.feature.jpp

Class JPPDiffLineFormulaExtractor

java.lang.Object

org.variantsync.diffdetective.feature.AbstractingFormulaExtractor

org.variantsync.diffdetective.feature.jpp.JPPDiffLineFormulaExtractor

All Implemented Interfaces:

DiffLineFormulaExtractor

public class JPPDiffLineFormulaExtractor
extends AbstractingFormulaExtractor

Extracts the expression from a JavaPP (Java PreProcessor) statement . For example, given the annotation "//#if defined(A) || B()", the extractor would extract "DEFINED_A || B". The extractor detects if and elif annotations (other annotations do not have expressions). The given JPP statement might also be a line in a diff (i.e., preceeded by a - or +).

Author:

Alexander Schultheiß

Field Summary

Fields

Modifier and Type	Field	Description
private static final Pattern	JPP_ANNOTATION_PATTERN
private static final String	JPP_ANNOTATION_REGEX

Constructor Summary

Constructors

Constructor	Description
JPPDiffLineFormulaExtractor()

Method Summary

Modifier and Type	Method	Description
protected String	abstractFormula(String formula)	Abstract the given formula.

Methods inherited from class org.variantsync.diffdetective.feature.AbstractingFormulaExtractor

extractFormula

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

JPP_ANNOTATION_REGEX

private static final String JPP_ANNOTATION_REGEX

See Also:

• Constant Field Values

JPP_ANNOTATION_PATTERN

private static final Pattern JPP_ANNOTATION_PATTERN

Constructor Details

JPPDiffLineFormulaExtractor

public JPPDiffLineFormulaExtractor()

Method Details

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 AbstractingJPPExpressionVisitor. The visitor traverses the tree starting from the root, searching for subtrees that must be abstracted. If such a subtree is found, the visitor abstracts 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