Namespaces
namespace	detail
	The following three functions are a low-level part of the RewriteRule API.

Classes
struct	ASTEdit

struct	Edit
	A concrete description of a source edit, represented by a character range in the source to be replaced and a corresponding replacement string. More...

class	MatchComputation
	A failable computation over nodes bound by AST matchers, with (limited) reflection via the `toString` method. More...

struct	RewriteRuleBase
	Description of a source-code transformation. More...

struct	RewriteRuleWith
	A source-code transformation with accompanying metadata. More...

struct	RewriteRuleWith< void >

Typedefs
template<typename T >
using	MatchConsumer = std::function< Expected< T >(const ast_matchers::MatchFinder::MatchResult &)>
	A failable computation over nodes bound by AST matchers.

using	RangeSelector = MatchConsumer< CharSourceRange >

using	EditGenerator = MatchConsumer< llvm::SmallVector< Edit, 1 > >
	Maps a match result to a list of concrete edits (with possible failure).

template<typename T >
using	Generator = std::shared_ptr< MatchComputation< T > >

using	TextGenerator = Generator< std::string >

using	AnyGenerator = MatchConsumer< llvm::Any >

using	RewriteRule = RewriteRuleWith< void >

using	StencilInterface = MatchComputation< std::string >

using	Stencil = std::shared_ptr< StencilInterface >
	A sequence of code fragments, references to parameters and code-generation operations that together can be evaluated to (a fragment of) source code or a diagnostic message, given a match result.

Enumerations
enum class	EditKind { Range , AddInclude }

enum class	IncludeFormat { Quoted , Angled }
	Format of the path in an include directive – angle brackets or quotes. More...

Functions
llvm::Error	notBoundError (llvm::StringRef Id)
	Creates an error that signals that a `MatchConsumer` expected a certain node to be bound by AST matchers, but it was not actually bound.

template<typename T >
MatchConsumer< T >	ifBound (std::string ID, MatchConsumer< T > TrueC, MatchConsumer< T > FalseC)
	Chooses between the two consumers, based on whether `ID` is bound in the match.

llvm::Expected< RangeSelector >	parseRangeSelector (llvm::StringRef Input)
	Parses a string representation of a `RangeSelector`.

RangeSelector	charRange (CharSourceRange R)

RangeSelector	enclose (RangeSelector Begin, RangeSelector End)
	Selects from the start of `Begin` and to the end of `End`.

RangeSelector	encloseNodes (std::string BeginID, std::string EndID)
	Convenience version of `range` where end-points are bound nodes.

RangeSelector	range (RangeSelector Begin, RangeSelector End)
	DEPRECATED. Use `enclose`.

RangeSelector	range (std::string BeginID, std::string EndID)
	DEPRECATED. Use `encloseNodes`.

RangeSelector	before (RangeSelector Selector)
	Selects the (empty) range [B,B) when `Selector` selects the range [B,E).

RangeSelector	after (RangeSelector Selector)
	Selects the point immediately following `Selector`.

RangeSelector	between (RangeSelector R1, RangeSelector R2)
	Selects the range between `R1` and `R2.

RangeSelector	node (std::string ID)
	Selects a node, including trailing semicolon, if any (for declarations and non-expression statements).

RangeSelector	statement (std::string ID)
	Selects a node, including trailing semicolon (always).

RangeSelector	member (std::string ID)
	Given a `MemberExpr`, selects the member token.

RangeSelector	name (std::string ID)
	Given a node with a "name", (like `NamedDecl`, `DeclRefExpr`, `CxxCtorInitializer`, and `TypeLoc`) selects the name's token.

RangeSelector	callArgs (std::string ID)

RangeSelector	constructExprArgs (std::string ID)

RangeSelector	statements (std::string ID)

RangeSelector	initListElements (std::string ID)

RangeSelector	elseBranch (std::string ID)
	Given an \IfStmt (bound to `ID`), selects the range of the else branch, starting from the `else` keyword.

RangeSelector	expansion (RangeSelector S)
	Selects the range from which `S` was expanded (possibly along with other source), if `S` is an expansion, and `S` itself, otherwise.

EditGenerator	edit (ASTEdit E)
	Generates a single (specified) edit.

EditGenerator	editList (llvm::SmallVector< ASTEdit, 1 > Edits)
	Lifts a list of `ASTEdit`s into an `EditGenerator`.

EditGenerator	noEdits ()
	Generates no edits.

EditGenerator	noopEdit (RangeSelector Anchor)
	Generates a single, no-op edit anchored at the start location of the specified range.

ASTEdit	note (RangeSelector Anchor, TextGenerator Note)
	Generates a single, no-op edit with the associated note anchored at the start location of the specified range.

EditGenerator	ifBound (std::string ID, ASTEdit TrueEdit, ASTEdit FalseEdit)
	Version of `ifBound` specialized to `ASTEdit`.

EditGenerator	ifBound (std::string ID, ASTEdit TrueEdit)
	Version of `ifBound` that has no "False" branch.

EditGenerator	flattenVector (SmallVector< EditGenerator, 2 > Generators)
	Flattens a list of generators into a single generator whose elements are the concatenation of the results of the argument generators.

template<typename... Ts>
EditGenerator	flatten (Ts &&...Edits)

ASTEdit	changeTo (RangeSelector Target, TextGenerator Replacement)
	Replaces a portion of the source text with `Replacement`.

ASTEdit	change (RangeSelector Target, TextGenerator Replacement)
	DEPRECATED: use `changeTo`.

ASTEdit	changeTo (TextGenerator Replacement)
	Replaces the entirety of a RewriteRule's match with `Replacement`.

ASTEdit	change (TextGenerator Replacement)
	DEPRECATED: use `changeTo`.

ASTEdit	insertBefore (RangeSelector S, TextGenerator Replacement)
	Inserts `Replacement` before `S`, leaving the source selected by \S unchanged.

ASTEdit	insertAfter (RangeSelector S, TextGenerator Replacement)
	Inserts `Replacement` after `S`, leaving the source selected by \S unchanged.

ASTEdit	remove (RangeSelector S)
	Removes the source selected by `S`.

ASTEdit	addInclude (RangeSelector Target, StringRef Header, IncludeFormat Format=IncludeFormat::Quoted)
	Adds an include directive for the given header to the file of `Target`.

ASTEdit	addInclude (StringRef Header, IncludeFormat Format=IncludeFormat::Quoted)
	Adds an include directive for the given header to the file associated with `RootID`.

template<typename Callable >
ASTEdit	withMetadata (ASTEdit Edit, Callable Metadata)

EditGenerator	shrinkTo (RangeSelector outer, RangeSelector inner)
	Assuming that the inner range is enclosed by the outer range, creates precision edits to remove the parts of the outer range that are not included in the inner range.

void	addInclude (RewriteRuleBase &Rule, llvm::StringRef Header, IncludeFormat Format=IncludeFormat::Quoted)
	For every case in Rule, adds an include directive for the given header.

template<int & ..., typename MetadataT >
std::enable_if_t<!std::is_same< MetadataT, void >::value, RewriteRule >	stripMetadata (RewriteRuleWith< MetadataT > Rule)
	Converts a `RewriteRuleWith<T>` to a `RewriteRule` by stripping off the metadata generators.

EditGenerator	rewriteDescendants (std::string NodeId, RewriteRule Rule)
	Applies `Rule` to all descendants of the node bound to `NodeId`.

Stencil	catVector (std::vector< Stencil > Parts)
	Constructs the string representing the concatenation of the given `Parts`.

template<typename... Ts>
Stencil	cat (Ts &&... Parts)
	Concatenates 0+ stencil pieces into a single stencil.

Stencil	expression (llvm::StringRef Id)
	Generates the source of the expression bound to `Id`, wrapping it in parentheses if it may parse differently depending on context.

Stencil	deref (llvm::StringRef ExprId)
	Constructs an idiomatic dereferencing of the expression bound to `ExprId`.

Stencil	maybeDeref (llvm::StringRef ExprId)
	If `ExprId` is of pointer type, constructs an idiomatic dereferencing of the expression bound to `ExprId`, including wrapping it in parentheses, if needed.

Stencil	addressOf (llvm::StringRef ExprId)
	Constructs an expression that idiomatically takes the address of the expression bound to `ExprId`.

Stencil	maybeAddressOf (llvm::StringRef ExprId)
	If `ExprId` is not a pointer type, constructs an expression that idiomatically takes the address of the expression bound to `ExprId`, including wrapping `ExprId` in parentheses, if needed.

Stencil	access (llvm::StringRef BaseId, Stencil Member)
	Constructs a `MemberExpr` that accesses the named member (`Member`) of the object bound to `BaseId`.

Stencil	access (llvm::StringRef BaseId, llvm::StringRef Member)

Stencil	ifBound (llvm::StringRef Id, Stencil TrueStencil, Stencil FalseStencil)
	Chooses between the two stencil parts, based on whether `ID` is bound in the match.

Stencil	ifBound (llvm::StringRef Id, llvm::StringRef TrueText, llvm::StringRef FalseText)
	Chooses between the two strings, based on whether `ID` is bound in the match.

Stencil	selectBound (std::vector< std::pair< std::string, Stencil > > CaseStencils, Stencil DefaultStencil=nullptr)
	Chooses between multiple stencils, based on the presence of bound nodes.

Stencil	run (MatchConsumer< std::string > C)
	Wraps a `MatchConsumer` in a `Stencil`, so that it can be used in a `Stencil`.

Stencil	describe (llvm::StringRef Id)
	Produces a human-readable rendering of the node bound to `Id`, suitable for diagnostics and debugging.

Stencil	dPrint (llvm::StringRef Id)
	For debug use only; semantics are not guaranteed.


template<int & ..., typename EditsT >
RewriteRule	makeRule (ast_matchers::internal::DynTypedMatcher M, EditsT &&Edits)
	Constructs a simple `RewriteRule`.

RewriteRule	makeRule (ast_matchers::internal::DynTypedMatcher M, std::initializer_list< ASTEdit > Edits)


template<typename MetadataT , int & ..., typename EditsT >
RewriteRuleWith< MetadataT >	makeRule (ast_matchers::internal::DynTypedMatcher M, EditsT &&Edits, Generator< MetadataT > Metadata)
	Overloads of `makeRule` that also generate metadata when matching.

template<typename MetadataT >
RewriteRuleWith< MetadataT >	makeRule (ast_matchers::internal::DynTypedMatcher M, std::initializer_list< ASTEdit > Edits, Generator< MetadataT > Metadata)


template<typename MetadataT >
RewriteRuleWith< MetadataT >	applyFirst (ArrayRef< RewriteRuleWith< MetadataT > > Rules)
	Applies the first rule whose pattern matches; other rules are ignored.

template<>
RewriteRuleWith< void >	applyFirst (ArrayRef< RewriteRuleWith< void > > Rules)

template<typename MetadataT >
RewriteRuleWith< MetadataT >	applyFirst (const std::vector< RewriteRuleWith< MetadataT > > &Rules)

template<typename MetadataT >
RewriteRuleWith< MetadataT >	applyFirst (std::initializer_list< RewriteRuleWith< MetadataT > > Rules)

Variables
const char	RootID [] = "___root___"

Typedef Documentation

◆ AnyGenerator

using clang::transformer::AnyGenerator = typedef MatchConsumer<llvm::Any>

Definition at line 69 of file RewriteRule.h.

◆ EditGenerator

using clang::transformer::EditGenerator = typedef MatchConsumer<llvm::SmallVector<Edit, 1> >

Maps a match result to a list of concrete edits (with possible failure).

This type is a building block of rewrite rules, but users will generally work in terms of ASTEdits (below) rather than directly in terms of EditGenerator.

Definition at line 63 of file RewriteRule.h.

◆ Generator

template<typename T >

using clang::transformer::Generator = typedef std::shared_ptr<MatchComputation<T> >

Definition at line 65 of file RewriteRule.h.

◆ MatchConsumer

template<typename T >

using clang::transformer::MatchConsumer = typedef std::function<Expected<T>(const ast_matchers::MatchFinder::MatchResult &)>

A failable computation over nodes bound by AST matchers.

The computation should report any errors though its return value (rather than terminating the program) to enable usage in interactive scenarios like clang-query.

This is a central abstraction of the Transformer framework.

Definition at line 34 of file MatchConsumer.h.

◆ RangeSelector

using clang::transformer::RangeSelector = typedef MatchConsumer<CharSourceRange>

Definition at line 27 of file RangeSelector.h.

◆ RewriteRule

using clang::transformer::RewriteRule = typedef RewriteRuleWith<void>

Definition at line 301 of file RewriteRule.h.

◆ Stencil

using clang::transformer::Stencil = typedef std::shared_ptr<StencilInterface>

A sequence of code fragments, references to parameters and code-generation operations that together can be evaluated to (a fragment of) source code or a diagnostic message, given a match result.

We use a shared_ptr to allow for easy and cheap copying of stencils. Since StencilInterface is an immutable interface, the sharing doesn't impose any risks. Otherwise, we would have to add a virtual copy method to the API and implement it for all derived classes.

Definition at line 46 of file Stencil.h.

◆ StencilInterface

using clang::transformer::StencilInterface = typedef MatchComputation<std::string>

Definition at line 36 of file Stencil.h.

◆ TextGenerator

using clang::transformer::TextGenerator = typedef Generator<std::string>

Definition at line 67 of file RewriteRule.h.

Enumeration Type Documentation

◆ EditKind

enum class clang::transformer::EditKind

strong

Enumerator
Range
AddInclude

Definition at line 35 of file RewriteRule.h.

◆ IncludeFormat

enum class clang::transformer::IncludeFormat

strong

Format of the path in an include directive – angle brackets or quotes.

Enumerator
Quoted
Angled

Definition at line 54 of file RewriteRule.h.

Function Documentation

◆ access() [1/2]

Stencil clang::transformer::access	(	llvm::StringRef	BaseId,
		llvm::StringRef	Member
	)

inline

Definition at line 104 of file Stencil.h.

References access(), clang::transformer::detail::makeStencil(), and clang::Member.

◆ access() [2/2]

Stencil clang::transformer::access	(	llvm::StringRef	BaseId,
		Stencil	Member
	)

Constructs a MemberExpr that accesses the named member (Member) of the object bound to BaseId.

The access is constructed idiomatically: if BaseId is bound to e and Member identifies member m, then returns e->m, when e is a pointer, e2->m when e = *e2 and e.m otherwise. Additionally, e is wrapped in parentheses, if needed.

Referenced by access().

◆ addInclude() [1/3]

ASTEdit clang::transformer::addInclude	(	RangeSelector	Target,
		StringRef	Header,
		IncludeFormat	Format = `IncludeFormat::Quoted`
	)

Adds an include directive for the given header to the file of Target.

The particular location specified by Target is ignored.

Definition at line 176 of file RewriteRule.cpp.

References E, formatHeaderPath(), and makeText().

Referenced by addInclude().

◆ addInclude() [2/3]

void clang::transformer::addInclude	(	RewriteRuleBase &	Rule,
		llvm::StringRef	Header,
		IncludeFormat	Format = `IncludeFormat::Quoted`
	)

For every case in Rule, adds an include directive for the given header.

The common use is assumed to be a rule with only one case. For example, to replace a function call and add headers corresponding to the new code, one could write:

auto R = makeRule(callExpr(callee(functionDecl(hasName("foo")))),
         changeTo(cat("bar()")));
addInclude(R, "path/to/bar_header.h");
addInclude(R, "vector", IncludeFormat::Angled);

◆ addInclude() [3/3]

ASTEdit clang::transformer::addInclude	(	StringRef	Header,
		IncludeFormat	Format = `IncludeFormat::Quoted`
	)

inline

Adds an include directive for the given header to the file associated with RootID.

If RootID matches inside a macro expansion, will add the directive to the file in which the macro was expanded (as opposed to the file in which the macro is defined).

Definition at line 226 of file RewriteRule.h.

References addInclude(), expansion(), node(), and RootID.

◆ addressOf()

Stencil clang::transformer::addressOf ( llvm::StringRef ExprId )

Constructs an expression that idiomatically takes the address of the expression bound to ExprId.

ExprId is wrapped in parentheses, if needed.

Definition at line 458 of file Stencil.cpp.

◆ after()

RangeSelector clang::transformer::after ( RangeSelector Selector )

Selects the point immediately following Selector.

That is, the (empty) range [E,E), when Selector selects either

the CharRange [B,E) or
the TokenRange [B,E'] where the token at E' spans the range [E',E).

Definition at line 108 of file RangeSelector.cpp.

References clang::CharSourceRange::getCharRange(), clang::SourceRange::getEnd(), clang::Decl::getLangOpts(), clang::CharSourceRange::getTokenRange(), invalidArgumentError(), clang::SourceRange::isInvalid(), clang::Lexer::makeFileCharRange(), and Range.

Referenced by between(), getUnaryRangeSelectors(), insertAfter(), and shrinkTo().

◆ applyFirst() [1/4]

template<typename MetadataT >

RewriteRuleWith< MetadataT > clang::transformer::applyFirst ( ArrayRef< RewriteRuleWith< MetadataT > > Rules )

Applies the first rule whose pattern matches; other rules are ignored.

If the matchers are independent then order doesn't matter. In that case, applyFirst is simply joining the set of rules into one.

Definition at line 414 of file RewriteRule.h.

References clang::transformer::RewriteRuleBase::Cases, and clang::transformer::RewriteRuleWith< MetadataT >::Metadata.

Referenced by applyFirst().

◆ applyFirst() [2/4]

template<>

RewriteRuleWith< void > clang::transformer::applyFirst ( ArrayRef< RewriteRuleWith< void > > Rules )

Definition at line 402 of file RewriteRule.cpp.

References clang::transformer::RewriteRuleBase::Cases.

◆ applyFirst() [3/4]

template<typename MetadataT >

RewriteRuleWith< MetadataT > clang::transformer::applyFirst ( const std::vector< RewriteRuleWith< MetadataT > > & Rules )

Definition at line 430 of file RewriteRule.h.

References applyFirst().

◆ applyFirst() [4/4]

template<typename MetadataT >

RewriteRuleWith< MetadataT > clang::transformer::applyFirst ( std::initializer_list< RewriteRuleWith< MetadataT > > Rules )

Definition at line 436 of file RewriteRule.h.

References applyFirst().

◆ before()

RangeSelector clang::transformer::before ( RangeSelector Selector )

Selects the (empty) range [B,B) when Selector selects the range [B,E).

Definition at line 99 of file RangeSelector.cpp.

References clang::CharSourceRange::getCharRange().

Referenced by between(), getUnaryRangeSelectors(), insertBefore(), note(), and shrinkTo().

◆ between()

RangeSelector clang::transformer::between	(	RangeSelector	R1,
		RangeSelector	R2
	)

inline

Selects the range between R1 and `R2.

Definition at line 60 of file RangeSelector.h.

References after(), before(), and enclose().

Referenced by getBinaryRangeSelectors().

◆ callArgs()

RangeSelector clang::transformer::callArgs ( std::string ID )

Definition at line 320 of file RangeSelector.cpp.

Referenced by getUnaryStringSelectors().

◆ cat()

template<typename... Ts>

Stencil clang::transformer::cat ( Ts &&... Parts )

Concatenates 0+ stencil pieces into a single stencil.

Arguments can be raw text, ranges in the matched code (RangeSelector) or other Stencils.

Definition at line 64 of file Stencil.h.

References catVector(), and clang::transformer::detail::makeStencil().

◆ catVector()

Stencil clang::transformer::catVector ( std::vector< Stencil > Parts )

Constructs the string representing the concatenation of the given Parts.

If only one element is passed in Parts, returns that element.

Definition at line 494 of file Stencil.cpp.

Referenced by cat().

◆ change() [1/2]

ASTEdit clang::transformer::change	(	RangeSelector	Target,
		TextGenerator	Replacement
	)

inline

DEPRECATED: use changeTo.

Definition at line 184 of file RewriteRule.h.

References changeTo().

Referenced by remove().

◆ change() [2/2]

ASTEdit clang::transformer::change ( TextGenerator Replacement )

inline

DEPRECATED: use changeTo.

Definition at line 198 of file RewriteRule.h.

References changeTo().

◆ changeTo() [1/2]

ASTEdit clang::transformer::changeTo	(	RangeSelector	Target,
		TextGenerator	Replacement
	)

Replaces a portion of the source text with Replacement.

Definition at line 126 of file RewriteRule.cpp.

References E.

Referenced by change(), changeTo(), insertAfter(), and insertBefore().

◆ changeTo() [2/2]

ASTEdit clang::transformer::changeTo ( TextGenerator Replacement )

inline

Replaces the entirety of a RewriteRule's match with Replacement.

For example, to replace a function call, one could write:

makeRule(callExpr(callee(functionDecl(hasName("foo")))),

changeTo(cat("bar()")))

Definition at line 194 of file RewriteRule.h.

References changeTo(), node(), and RootID.

◆ charRange()

RangeSelector clang::transformer::charRange ( CharSourceRange R )

inline

Definition at line 29 of file RangeSelector.h.

◆ constructExprArgs()

RangeSelector clang::transformer::constructExprArgs ( std::string ID )

Definition at line 324 of file RangeSelector.cpp.

◆ deref()

Stencil clang::transformer::deref ( llvm::StringRef ExprId )

Constructs an idiomatic dereferencing of the expression bound to ExprId.

ExprId is wrapped in parentheses, if needed.

Definition at line 448 of file Stencil.cpp.

◆ describe()

Stencil clang::transformer::describe ( llvm::StringRef Id )

Produces a human-readable rendering of the node bound to Id, suitable for diagnostics and debugging.

This operator can be applied to any node, but is targeted at those whose source cannot be printed directly, including:

Types. represented based on their structure. Note that namespace qualifiers are always printed, with the anonymous namespace represented explicitly. No desugaring or canonicalization is applied.

◆ dPrint()

Stencil clang::transformer::dPrint ( llvm::StringRef Id )

For debug use only; semantics are not guaranteed.

Returns: the string resulting from calling the node's print() method.

◆ edit()

EditGenerator clang::transformer::edit ( ASTEdit E )

Generates a single (specified) edit.

Definition at line 84 of file RewriteRule.cpp.

References translateEdits().

Referenced by ifBound(), clang::transformer::detail::injectEdits(), and clang::transformer::detail::makeEditGenerator().

◆ editList()

EditGenerator clang::transformer::editList ( llvm::SmallVector< ASTEdit, 1 > Edits )

Lifts a list of ASTEdits into an EditGenerator.

The EditGenerator will return an empty vector if any of the edits apply to portions of the source that are ineligible for rewriting (certain interactions with macros, for example) and it will fail if any invariants are violated relating to bound nodes in the match. However, it does not fail in the case of conflicting edits – conflict handling is left to clients. We recommend use of the AtomicChange or Replacements classes for assistance in detecting such conflicts.

Definition at line 78 of file RewriteRule.cpp.

References translateEdits().

Referenced by clang::transformer::detail::makeEditGenerator(), noEdits(), and shrinkTo().

◆ elseBranch()

RangeSelector clang::transformer::elseBranch ( std::string ID )

Given an \IfStmt (bound to ID), selects the range of the else branch, starting from the else keyword.

Definition at line 352 of file RangeSelector.cpp.

Referenced by getUnaryStringSelectors().

◆ enclose()

RangeSelector clang::transformer::enclose	(	RangeSelector	Begin,
		RangeSelector	End
	)

Selects from the start of Begin and to the end of End.

Definition at line 157 of file RangeSelector.cpp.

References Begin, E, and invalidArgumentError().

Referenced by between(), encloseNodes(), getBinaryRangeSelectors(), range(), and shrinkTo().

◆ encloseNodes()

RangeSelector clang::transformer::encloseNodes	(	std::string	BeginID,
		std::string	EndID
	)

Convenience version of range where end-points are bound nodes.

Definition at line 176 of file RangeSelector.cpp.

References enclose(), and node().

Referenced by getBinaryStringSelectors(), and range().

◆ expansion()

RangeSelector clang::transformer::expansion ( RangeSelector S )

Selects the range from which S was expanded (possibly along with other source), if S is an expansion, and S itself, otherwise.

Corresponds to SourceManager::getExpansionRange.

Definition at line 356 of file RangeSelector.cpp.

Referenced by addInclude(), and getUnaryRangeSelectors().

◆ expression()

Stencil clang::transformer::expression ( llvm::StringRef Id )

Generates the source of the expression bound to Id, wrapping it in parentheses if it may parse differently depending on context.

For example, a binary operation is always wrapped, while a variable reference is never wrapped.

Definition at line 443 of file Stencil.cpp.

References Id.

◆ flatten()

template<typename... Ts>

EditGenerator clang::transformer::flatten ( Ts &&... Edits )

Definition at line 172 of file RewriteRule.h.

References flattenVector(), and clang::transformer::detail::injectEdits().

◆ flattenVector()

EditGenerator clang::transformer::flattenVector ( SmallVector< EditGenerator, 2 > Generators )

Flattens a list of generators into a single generator whose elements are the concatenation of the results of the argument generators.

Definition at line 109 of file RewriteRule.cpp.

Referenced by flatten().

◆ ifBound() [1/5]

Stencil clang::transformer::ifBound	(	llvm::StringRef	Id,
		llvm::StringRef	TrueText,
		llvm::StringRef	FalseText
	)

inline

Chooses between the two strings, based on whether ID is bound in the match.

Definition at line 114 of file Stencil.h.

References Id, ifBound(), and clang::transformer::detail::makeStencil().

◆ ifBound() [2/5]

Stencil clang::transformer::ifBound	(	llvm::StringRef	Id,
		Stencil	TrueStencil,
		Stencil	FalseStencil
	)

Chooses between the two stencil parts, based on whether ID is bound in the match.

◆ ifBound() [3/5]

EditGenerator clang::transformer::ifBound	(	std::string	ID,
		ASTEdit	TrueEdit
	)

inline

Version of ifBound that has no "False" branch.

If the node is not bound, then no edits are produced.

Definition at line 155 of file RewriteRule.h.

References edit(), ID, ifBound(), and noEdits().

◆ ifBound() [4/5]

EditGenerator clang::transformer::ifBound	(	std::string	ID,
		ASTEdit	TrueEdit,
		ASTEdit	FalseEdit
	)

inline

Version of ifBound specialized to ASTEdit.

Definition at line 147 of file RewriteRule.h.

References edit(), ID, and ifBound().

◆ ifBound() [5/5]

template<typename T >

MatchConsumer< T > clang::transformer::ifBound	(	std::string	ID,
		MatchConsumer< T >	TrueC,
		MatchConsumer< T >	FalseC
	)

Chooses between the two consumers, based on whether ID is bound in the match.

Definition at line 47 of file MatchConsumer.h.

References ID, and clang::Result.

Referenced by ifBound().

◆ initListElements()

RangeSelector clang::transformer::initListElements ( std::string ID )

Definition at line 339 of file RangeSelector.cpp.

Referenced by getUnaryStringSelectors().

◆ insertAfter()

ASTEdit clang::transformer::insertAfter	(	RangeSelector	S,
		TextGenerator	Replacement
	)

inline

Inserts Replacement after S, leaving the source selected by \S unchanged.

Definition at line 210 of file RewriteRule.h.

References after(), and changeTo().

◆ insertBefore()

ASTEdit clang::transformer::insertBefore	(	RangeSelector	S,
		TextGenerator	Replacement
	)

inline

Inserts Replacement before S, leaving the source selected by \S unchanged.

Definition at line 204 of file RewriteRule.h.

References before(), and changeTo().

◆ makeRule() [1/4]

template<int & ..., typename EditsT >

RewriteRule clang::transformer::makeRule	(	ast_matchers::internal::DynTypedMatcher	M,
		EditsT &&	Edits
	)

Constructs a simple RewriteRule.

Edits can be an EditGenerator, multiple ASTEdits, or a single ASTEdit.

Definition at line 328 of file RewriteRule.h.

References clang::transformer::detail::makeEditGenerator(), and clang::transformer::detail::makeRule().

◆ makeRule() [2/4]

template<typename MetadataT , int & ..., typename EditsT >

RewriteRuleWith< MetadataT > clang::transformer::makeRule	(	ast_matchers::internal::DynTypedMatcher	M,
		EditsT &&	Edits,
		Generator< MetadataT >	Metadata
	)

Overloads of makeRule that also generate metadata when matching.

Definition at line 341 of file RewriteRule.h.

References clang::transformer::detail::makeEditGenerator(), and clang::transformer::detail::makeRule().

◆ makeRule() [3/4]

RewriteRule clang::transformer::makeRule	(	ast_matchers::internal::DynTypedMatcher	M,
		std::initializer_list< ASTEdit >	Edits
	)

Definition at line 201 of file RewriteRule.cpp.

References clang::transformer::detail::makeEditGenerator(), and clang::transformer::detail::makeRule().

◆ makeRule() [4/4]

template<typename MetadataT >

RewriteRuleWith< MetadataT > clang::transformer::makeRule	(	ast_matchers::internal::DynTypedMatcher	M,
		std::initializer_list< ASTEdit >	Edits,
		Generator< MetadataT >	Metadata
	)

Definition at line 350 of file RewriteRule.h.

References clang::transformer::detail::makeEditGenerator(), and clang::transformer::detail::makeRule().

◆ maybeAddressOf()

Stencil clang::transformer::maybeAddressOf ( llvm::StringRef ExprId )

If ExprId is not a pointer type, constructs an expression that idiomatically takes the address of the expression bound to ExprId, including wrapping ExprId in parentheses, if needed.

Otherwise, generates the original expression source.

Definition at line 463 of file Stencil.cpp.

◆ maybeDeref()

Stencil clang::transformer::maybeDeref ( llvm::StringRef ExprId )

If ExprId is of pointer type, constructs an idiomatic dereferencing of the expression bound to ExprId, including wrapping it in parentheses, if needed.

Otherwise, generates the original expression source.

Definition at line 453 of file Stencil.cpp.

◆ member()

RangeSelector clang::transformer::member ( std::string ID )

Given a MemberExpr, selects the member token.

ID is the node's binding in the match result.

Definition at line 181 of file RangeSelector.cpp.

References clang::DynTypedNode::get(), getNode(), clang::DynTypedNode::getNodeKind(), clang::CharSourceRange::getTokenRange(), Node, and typeError().

Referenced by getUnaryStringSelectors().

◆ name()

RangeSelector clang::transformer::name ( std::string ID )

Given a node with a "name", (like NamedDecl, DeclRefExpr, CxxCtorInitializer, and TypeLoc) selects the name's token.

Only selects the final identifier of a qualified name, but not any qualifiers or template arguments. For example, for ::foo::bar::baz and ::foo::bar::baz<int>, it selects only baz.

Parameters

ID	is the node's binding in the match result.

Definition at line 193 of file RangeSelector.cpp.

References D, E, clang::DynTypedNode::get(), clang::Decl::getLocation(), getNode(), clang::DynTypedNode::getNodeKind(), clang::tooling::getText(), clang::CharSourceRange::getTokenRange(), clang::TypeLoc::isNull(), Loc, missingPropertyError(), Node, clang::T, and typeError().

Referenced by getUnaryStringSelectors().

◆ node()

RangeSelector clang::transformer::node ( std::string ID )

Selects a node, including trailing semicolon, if any (for declarations and non-expression statements).

ID is the node's binding in the match result.

Definition at line 134 of file RangeSelector.cpp.

References clang::DynTypedNode::get(), clang::tooling::getExtendedRange(), getNode(), clang::DynTypedNode::getSourceRange(), clang::CharSourceRange::getTokenRange(), and Node.

Referenced by addInclude(), changeTo(), encloseNodes(), and getUnaryStringSelectors().

◆ noEdits()

EditGenerator clang::transformer::noEdits ( )

inline

Generates no edits.

Definition at line 135 of file RewriteRule.h.

References editList().

Referenced by ifBound().

◆ noopEdit()

EditGenerator clang::transformer::noopEdit ( RangeSelector Anchor )

Generates a single, no-op edit anchored at the start location of the specified range.

A noopEdit may be preferred over noEdits to associate a diagnostic Explanation with the rule.

Definition at line 90 of file RewriteRule.cpp.

References Begin, E, clang::SourceRange::getBegin(), clang::CharSourceRange::getCharRange(), and Range.

◆ notBoundError()

llvm::Error clang::transformer::notBoundError ( llvm::StringRef Id )

inline

Creates an error that signals that a MatchConsumer expected a certain node to be bound by AST matchers, but it was not actually bound.

Definition at line 39 of file MatchConsumer.h.

References Id.

◆ note()

ASTEdit clang::transformer::note	(	RangeSelector	Anchor,
		TextGenerator	Note
	)

Generates a single, no-op edit with the associated note anchored at the start location of the specified range.

Definition at line 133 of file RewriteRule.cpp.

References before(), E, and clang::Note.

◆ parseRangeSelector()

Expected< RangeSelector > clang::transformer::parseRangeSelector ( llvm::StringRef Input )

Parses a string representation of a RangeSelector.

The grammar of these strings is closely based on the (sub)grammar of RangeSelectors as they'd appear in C++ code. However, this language constrains the set of permissible strings (for node ids) – it does not support escapes in the string. Additionally, the charRange combinator is not supported, because there is no representation of values of type CharSourceRange in this (little) language.

Definition at line 267 of file Parsing.cpp.

References consumeWhitespace(), makeParseError(), and parseRangeSelectorImpl().

◆ range() [1/2]

RangeSelector clang::transformer::range	(	RangeSelector	Begin,
		RangeSelector	End
	)

inline

DEPRECATED. Use enclose.

Definition at line 41 of file RangeSelector.h.

References Begin, and enclose().

◆ range() [2/2]

RangeSelector clang::transformer::range	(	std::string	BeginID,
		std::string	EndID
	)

inline

DEPRECATED. Use encloseNodes.

Definition at line 46 of file RangeSelector.h.

References encloseNodes().

◆ remove()

ASTEdit clang::transformer::remove ( RangeSelector S )

Removes the source selected by S.

Definition at line 162 of file RewriteRule.cpp.

References change(), and makeText().

Referenced by shrinkTo().

◆ rewriteDescendants()

EditGenerator clang::transformer::rewriteDescendants	(	std::string	NodeId,
		RewriteRule	Rule
	)

Applies Rule to all descendants of the node bound to NodeId.

Rule can refer to nodes bound by the calling rule. Rule is not applied to the node itself.

For example,

auto InlineX =
    makeRule(declRefExpr(to(varDecl(hasName("x")))), changeTo(cat("3")));
makeRule(functionDecl(hasName("f"), hasBody(stmt().bind("body"))).bind("f"),
         flatten(
           changeTo(name("f"), cat("newName")),
           rewriteDescendants("body", InlineX)));

Here, we find the function f, change its name to newName and change all appearances of x in its body to 3.

Definition at line 344 of file RewriteRule.cpp.

References clang::transformer::detail::rewriteDescendants().

◆ run()

Stencil clang::transformer::run ( MatchConsumer< std::string > C )

Wraps a MatchConsumer in a Stencil, so that it can be used in a Stencil.

This supports user-defined extensions to the Stencil language.

Definition at line 490 of file Stencil.cpp.

◆ selectBound()

Stencil clang::transformer::selectBound	(	std::vector< std::pair< std::string, Stencil > >	CaseStencils,
		Stencil	DefaultStencil = `nullptr`
	)

Chooses between multiple stencils, based on the presence of bound nodes.

CaseStencils takes a vector of (ID, Stencil) pairs and checks each ID in order to see if it's bound to a node. If so, the associated Stencil is run and all other cases are ignored. An optional DefaultStencil can be provided to be run if all cases are exhausted beacause none of the provided IDs are bound. If no default case is provided and all cases are exhausted, the stencil will fail with error llvm::errc::result_out_of_range.

For example, say one matches a statement's type with: anyOf( qualType(isInteger()).bind("int"), qualType(realFloatingPointType()).bind("float"), qualType(isAnyCharacter()).bind("char"), booleanType().bind("bool"))

Then, one can decide in a stencil how to construct a literal. cat("a = ", selectBound( {{"int", cat("0")}, {"float", cat("0.0")}, {"char", cat("'\\0'")}, {"bool", cat("false")}}))

In addition, one could supply a default case for all other types: selectBound( {{"int", cat("0")}, ... {"bool", cat("false")}}, cat("{}"))

Definition at line 483 of file Stencil.cpp.

◆ shrinkTo()

EditGenerator clang::transformer::shrinkTo	(	RangeSelector	outer,
		RangeSelector	inner
	)

inline

Assuming that the inner range is enclosed by the outer range, creates precision edits to remove the parts of the outer range that are not included in the inner range.

Definition at line 257 of file RewriteRule.h.

References after(), before(), editList(), enclose(), and remove().

◆ statement()

RangeSelector clang::transformer::statement ( std::string ID )

Selects a node, including trailing semicolon (always).

Useful for selecting expression statements. ID is the node's binding in the match result.

Definition at line 147 of file RangeSelector.cpp.

References clang::tooling::getExtendedRange(), getNode(), and Node.

Referenced by getUnaryStringSelectors().

◆ statements()

RangeSelector clang::transformer::statements ( std::string ID )

Definition at line 278 of file RangeSelector.cpp.

Referenced by getUnaryStringSelectors().

◆ stripMetadata()

template<int & ..., typename MetadataT >

std::enable_if_t<!std::is_same< MetadataT, void >::value, RewriteRule > clang::transformer::stripMetadata ( RewriteRuleWith< MetadataT > Rule )

Converts a RewriteRuleWith<T> to a RewriteRule by stripping off the metadata generators.

Definition at line 445 of file RewriteRule.h.

References clang::transformer::RewriteRuleBase::Cases.

◆ withMetadata()

template<typename Callable >

ASTEdit clang::transformer::withMetadata	(	ASTEdit	Edit,
		Callable	Metadata
	)

inline

Definition at line 244 of file RewriteRule.h.

References clang::transformer::Edit::Metadata.

Variable Documentation

◆ RootID

const char clang::transformer::RootID = "___root___"

extern

Definition at line 32 of file RewriteRule.cpp.

Referenced by addInclude(), clang::transformer::detail::buildMatchers(), changeTo(), and clang::transformer::detail::getRuleMatchLoc().

Namespaces

Classes

Typedefs

Enumerations

Functions

Variables

Typedef Documentation

◆ AnyGenerator

◆ EditGenerator

◆ Generator

◆ MatchConsumer

◆ RangeSelector

◆ RewriteRule

◆ Stencil

◆ StencilInterface

◆ TextGenerator

Enumeration Type Documentation

◆ EditKind

◆ IncludeFormat

Function Documentation

◆ access() [1/2]

◆ access() [2/2]

◆ addInclude() [1/3]

◆ addInclude() [2/3]

◆ addInclude() [3/3]

◆ addressOf()

◆ after()

◆ applyFirst() [1/4]

◆ applyFirst() [2/4]

◆ applyFirst() [3/4]

◆ applyFirst() [4/4]

◆ before()

◆ between()

◆ callArgs()

◆ cat()

◆ catVector()

◆ change() [1/2]

◆ change() [2/2]

◆ changeTo() [1/2]

◆ changeTo() [2/2]

◆ charRange()

◆ constructExprArgs()

◆ deref()

◆ describe()

◆ dPrint()

◆ edit()

◆ editList()

◆ elseBranch()

◆ enclose()

◆ encloseNodes()

◆ expansion()

◆ expression()

◆ flatten()

◆ flattenVector()

◆ ifBound() [1/5]

◆ ifBound() [2/5]

◆ ifBound() [3/5]

◆ ifBound() [4/5]

◆ ifBound() [5/5]

◆ initListElements()

◆ insertAfter()

◆ insertBefore()

◆ makeRule() [1/4]

◆ makeRule() [2/4]

◆ makeRule() [3/4]

◆ makeRule() [4/4]

◆ maybeAddressOf()

◆ maybeDeref()

◆ member()

◆ name()

◆ node()

◆ noEdits()

◆ noopEdit()

◆ notBoundError()

◆ note()

◆ parseRangeSelector()

◆ range() [1/2]

◆ range() [2/2]

◆ remove()

◆ rewriteDescendants()