Package io.codemodder.ast

Class ASTTransforms

java.lang.Object

io.codemodder.ast.ASTTransforms

public final class ASTTransforms
extends Object

Constructor Summary

Constructors

Constructor	Description
ASTTransforms()

Method Summary

Modifier and Type	Method	Description
static void	addImportIfMissing(com.github.javaparser.ast.CompilationUnit cu, Class<?> clazz)	Add an import in alphabetical order.
static void	addImportIfMissing(com.github.javaparser.ast.CompilationUnit cu, String className)	Add an import in alphabetical order.
static void	addStatementAfterStatement(com.github.javaparser.ast.stmt.Statement existingStatement, com.github.javaparser.ast.stmt.Statement newStatement)	Adds an Statement after another Statement.
static void	addStatementBeforeStatement(com.github.javaparser.ast.stmt.Statement existingStatement, com.github.javaparser.ast.stmt.Statement newStatement)	Adds an Statement before another Statement.
static void	addStaticImportIfMissing(com.github.javaparser.ast.CompilationUnit cu, String method)
static com.github.javaparser.ast.stmt.TryStmt	combineResources(com.github.javaparser.ast.stmt.TryStmt innerTry)	Given a TryStmt without any finally and catch clauses, and that is the first statement of a try with resources block, merge the two try statements into one.
static void	mergeConcatenatedLiterals(com.github.javaparser.ast.expr.Expression e)	Given a string expression, merge any literals that are directly concatenated.
static com.github.javaparser.ast.expr.Expression	removeEmptyStringConcatenation(com.github.javaparser.ast.expr.BinaryExpr binexp)	Removes concatenation with empty strings.
static void	removeEmptyStringConcatenation(com.github.javaparser.ast.Node subtree)	Removes all concatenations with empty strings in the given subtree.
static void	removeImportIfUnused(com.github.javaparser.ast.CompilationUnit cu, String className)	Remove an import if we can't find references to it in the code.
static void	removeUnusedLocalVariables(com.github.javaparser.ast.Node subtree)	Removes unused variables.
static com.github.javaparser.ast.stmt.TryStmt	splitResources(com.github.javaparser.ast.stmt.TryStmt stmt, int index)	Given a TryStmt split its resources into two nested TryStmts.
static com.github.javaparser.ast.stmt.TryStmt	wrapIntoResource(com.github.javaparser.ast.stmt.ExpressionStmt stmt, com.github.javaparser.ast.expr.VariableDeclarationExpr vdecl, LocalScope scope)	Given a local variable declaration stmt, where vdecl is a single initialized declaration of a variable v with scope scope, v is never assigned in its scope, then wrap the declaration into as a resource of a try stmt.

Methods inherited from class java.lang.Object

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

Constructor Details

ASTTransforms

public ASTTransforms()

Method Details

addImportIfMissing

public static void addImportIfMissing(com.github.javaparser.ast.CompilationUnit cu,
 String className)

Add an import in alphabetical order.

addImportIfMissing

public static void addImportIfMissing(com.github.javaparser.ast.CompilationUnit cu,
 Class<?> clazz)

Add an import in alphabetical order.

addStaticImportIfMissing

public static void addStaticImportIfMissing(com.github.javaparser.ast.CompilationUnit cu,
 String method)

addStatementBeforeStatement

public static void addStatementBeforeStatement(com.github.javaparser.ast.stmt.Statement existingStatement,
 com.github.javaparser.ast.stmt.Statement newStatement)

Adds an Statement before another Statement. Single Statements in the body of For/Do/While/If/Labeled Statements are replaced with a BlockStmt containing both statements.

addStatementAfterStatement

public static void addStatementAfterStatement(com.github.javaparser.ast.stmt.Statement existingStatement,
 com.github.javaparser.ast.stmt.Statement newStatement)

Adds an Statement after another Statement. Single Statements in the body of For/Do/While/If/Labeled Statements are replaced with a BlockStmt containing both statements.

wrapIntoResource

public static com.github.javaparser.ast.stmt.TryStmt wrapIntoResource(com.github.javaparser.ast.stmt.ExpressionStmt stmt,
 com.github.javaparser.ast.expr.VariableDeclarationExpr vdecl,
 LocalScope scope)

Given a local variable declaration stmt, where vdecl is a single initialized declaration of a variable v with scope scope, v is never assigned in its scope, then wrap the declaration into as a resource of a try stmt.

splitResources

public static com.github.javaparser.ast.stmt.TryStmt splitResources(com.github.javaparser.ast.stmt.TryStmt stmt,
 int index)

Given a TryStmt split its resources into two nested TryStmts.

combineResources

public static com.github.javaparser.ast.stmt.TryStmt combineResources(com.github.javaparser.ast.stmt.TryStmt innerTry)

Given a TryStmt without any finally and catch clauses, and that is the first statement of a try with resources block, merge the two try statements into one.

removeImportIfUnused

public static void removeImportIfUnused(com.github.javaparser.ast.CompilationUnit cu,
 String className)

Remove an import if we can't find references to it in the code.

removeEmptyStringConcatenation

public static com.github.javaparser.ast.expr.Expression removeEmptyStringConcatenation(com.github.javaparser.ast.expr.BinaryExpr binexp)

Removes concatenation with empty strings. For example, in : ``` String a = "some string"; String b = ""; a + "" + b; ``` The expression `a + "" + b` would be reduced to `a`. Returns the expression without the empty concatenations.

removeEmptyStringConcatenation

public static void removeEmptyStringConcatenation(com.github.javaparser.ast.Node subtree)

Removes all concatenations with empty strings in the given subtree.

removeUnusedLocalVariables

public static void removeUnusedLocalVariables(com.github.javaparser.ast.Node subtree)

Removes unused variables.

mergeConcatenatedLiterals

public static void mergeConcatenatedLiterals(com.github.javaparser.ast.expr.Expression e)

Given a string expression, merge any literals that are directly concatenated. This transform will recurse over any Names referenced.