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//===--- MacroExpander.h - Format C++ code ----------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
///
/// \file
/// This file contains the main building blocks of macro support in
/// clang-format.
///
/// In order to not violate the requirement that clang-format can format files
/// in isolation, clang-format's macro support uses expansions users provide
/// as part of clang-format's style configuration.
///
/// Macro definitions are of the form "MACRO(p1, p2)=p1 + p2", but only support
/// one level of expansion (\see MacroExpander for a full description of what
/// is supported).
///
/// As part of parsing, clang-format uses the MacroExpander to expand the
/// spelled token streams into expanded token streams when it encounters a
/// macro call. The UnwrappedLineParser continues to parse UnwrappedLines
/// from the expanded token stream.
/// After the expanded unwrapped lines are parsed, the MacroUnexpander matches
/// the spelled token stream into unwrapped lines that best resemble the
/// structure of the expanded unwrapped lines.
///
/// When formatting, clang-format formats the expanded unwrapped lines first,
/// determining the token types. Next, it formats the spelled unwrapped lines,
/// keeping the token types fixed, while allowing other formatting decisions
/// to change.
///
//===----------------------------------------------------------------------===//
#ifndef CLANG_LIB_FORMAT_MACROS_H
#define CLANG_LIB_FORMAT_MACROS_H
#include <string>
#include <unordered_map>
#include <vector>
#include "Encoding.h"
#include "FormatToken.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringRef.h"
namespace llvm {
class MemoryBuffer;
} // namespace llvm
namespace clang {
class IdentifierTable;
class SourceManager;
namespace format {
struct FormatStyle;
/// Takes a set of macro definitions as strings and allows expanding calls to
/// those macros.
///
/// For example:
/// Definition: A(x, y)=x + y
/// Call : A(int a = 1, 2)
/// Expansion : int a = 1 + 2
///
/// Expansion does not check arity of the definition.
/// If fewer arguments than expected are provided, the remaining parameters
/// are considered empty:
/// Call : A(a)
/// Expansion: a +
/// If more arguments than expected are provided, they will be discarded.
///
/// The expander does not support:
/// - recursive expansion
/// - stringification
/// - concatenation
/// - variadic macros
///
/// Furthermore, only a single expansion of each macro argument is supported,
/// so that we cannot get conflicting formatting decisions from different
/// expansions.
/// Definition: A(x)=x+x
/// Call : A(id)
/// Expansion : id+x
///
class MacroExpander {
public:
using ArgsList = llvm::ArrayRef<llvm::SmallVector<FormatToken *, 8>>;
/// Construct a macro expander from a set of macro definitions.
/// Macro definitions must be encoded as UTF-8.
///
/// Each entry in \p Macros must conform to the following simple
/// macro-definition language:
/// <definition> ::= <id> <expansion> | <id> "(" <params> ")" <expansion>
/// <params> ::= <id-list> | ""
/// <id-list> ::= <id> | <id> "," <params>
/// <expansion> ::= "=" <tail> | <eof>
/// <tail> ::= <tok> <tail> | <eof>
///
/// Macros that cannot be parsed will be silently discarded.
///
MacroExpander(const std::vector<std::string> &Macros,
clang::SourceManager &SourceMgr, const FormatStyle &Style,
llvm::SpecificBumpPtrAllocator<FormatToken> &Allocator,
IdentifierTable &IdentTable);
~MacroExpander();
/// Returns whether a macro \p Name is defined.
bool defined(llvm::StringRef Name) const;
/// Returns whether the macro has no arguments and should not consume
/// subsequent parentheses.
bool objectLike(llvm::StringRef Name) const;
/// Returns the expanded stream of format tokens for \p ID, where
/// each element in \p Args is a positional argument to the macro call.
llvm::SmallVector<FormatToken *, 8> expand(FormatToken *ID,
ArgsList Args) const;
private:
struct Definition;
class DefinitionParser;
void parseDefinition(const std::string &Macro);
clang::SourceManager &SourceMgr;
const FormatStyle &Style;
llvm::SpecificBumpPtrAllocator<FormatToken> &Allocator;
IdentifierTable &IdentTable;
std::vector<std::unique_ptr<llvm::MemoryBuffer>> Buffers;
llvm::StringMap<Definition> Definitions;
};
} // namespace format
} // namespace clang
#endif
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