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//===--- ASTNode.cpp - Swift Language ASTs --------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
//
// This file implements the ASTNode, which is a union of Stmt, Expr, and Decl.
//
//===----------------------------------------------------------------------===//
#include "swift/AST/ASTNode.h"
#include "swift/AST/Decl.h"
#include "swift/AST/Expr.h"
#include "swift/AST/Stmt.h"
#include "swift/AST/Pattern.h"
#include "swift/AST/TypeRepr.h"
#include "swift/Basic/SourceLoc.h"
#include "swift/Parse/Token.h"
using namespace swift;
SourceRange ASTNode::getSourceRange() const {
if (const auto *E = this->dyn_cast<Expr*>())
return E->getSourceRange();
if (const auto *S = this->dyn_cast<Stmt*>())
return S->getSourceRange();
if (const auto *D = this->dyn_cast<Decl*>())
return D->getSourceRange();
if (const auto *P = this->dyn_cast<Pattern*>())
return P->getSourceRange();
if (const auto *T = this->dyn_cast<TypeRepr *>())
return T->getSourceRange();
if (const auto *C = this->dyn_cast<StmtConditionElement *>())
return C->getSourceRange();
if (const auto *I = this->dyn_cast<CaseLabelItem *>()) {
return I->getSourceRange();
}
assert(!isNull() && "Null ASTNode doesn't have a source range");
llvm_unreachable("unsupported AST node");
}
/// Return the location of the start of the statement.
SourceLoc ASTNode::getStartLoc() const {
return getSourceRange().Start;
}
/// Return the location of the end of the statement.
SourceLoc ASTNode::getEndLoc() const {
return getSourceRange().End;
}
DeclContext *ASTNode::getAsDeclContext() const {
if (auto *E = this->dyn_cast<Expr*>()) {
if (isa<AbstractClosureExpr>(E))
return static_cast<AbstractClosureExpr*>(E);
} else if (is<Stmt*>()) {
return nullptr;
} else if (auto *D = this->dyn_cast<Decl*>()) {
if (isa<DeclContext>(D))
return cast<DeclContext>(D);
} else if (getOpaqueValue())
llvm_unreachable("unsupported AST node");
return nullptr;
}
bool ASTNode::isImplicit() const {
if (const auto *E = this->dyn_cast<Expr*>())
return E->isImplicit();
if (const auto *S = this->dyn_cast<Stmt*>())
return S->isImplicit();
if (const auto *D = this->dyn_cast<Decl*>())
return D->isImplicit();
if (const auto *P = this->dyn_cast<Pattern*>())
return P->isImplicit();
if (const auto *T = this->dyn_cast<TypeRepr*>())
return false;
if (const auto *C = this->dyn_cast<StmtConditionElement *>())
return false;
if (const auto *I = this->dyn_cast<CaseLabelItem *>())
return false;
llvm_unreachable("unsupported AST node");
}
void ASTNode::walk(ASTWalker &Walker) {
if (auto *E = this->dyn_cast<Expr*>())
E->walk(Walker);
else if (auto *S = this->dyn_cast<Stmt*>())
S->walk(Walker);
else if (auto *D = this->dyn_cast<Decl*>())
D->walk(Walker);
else if (auto *P = this->dyn_cast<Pattern*>())
P->walk(Walker);
else if (auto *T = this->dyn_cast<TypeRepr*>())
T->walk(Walker);
else if (auto *C = this->dyn_cast<StmtConditionElement *>())
C->walk(Walker);
else if (auto *I = this->dyn_cast<CaseLabelItem *>()) {
if (auto *P = I->getPattern())
P->walk(Walker);
if (auto *G = I->getGuardExpr())
G->walk(Walker);
} else
llvm_unreachable("unsupported AST node");
}
void ASTNode::dump(raw_ostream &OS, unsigned Indent) const {
if (isNull())
OS << "(null)";
else if (auto S = dyn_cast<Stmt*>())
S->dump(OS, /*context=*/nullptr, Indent);
else if (auto E = dyn_cast<Expr*>())
E->dump(OS, Indent);
else if (auto D = dyn_cast<Decl*>())
D->dump(OS, Indent);
else if (auto P = dyn_cast<Pattern*>())
P->dump(OS, Indent);
else if (auto T = dyn_cast<TypeRepr*>())
T->print(OS);
else if (auto *C = dyn_cast<StmtConditionElement *>())
OS.indent(Indent) << "(statement condition)";
else if (auto *I = dyn_cast<CaseLabelItem *>()) {
OS.indent(Indent) << "(case label item)";
} else
llvm_unreachable("unsupported AST node");
}
void ASTNode::dump() const {
dump(llvm::errs());
}
StringRef swift::getTokenText(tok kind) {
switch(kind) {
#define KEYWORD(KW) case tok::kw_##KW: return #KW;
#define POUND_KEYWORD(KW) case tok::pound_##KW: return "#"#KW;
#define PUNCTUATOR(PUN, TEXT) case tok::PUN: return TEXT;
#include "swift/AST/TokenKinds.def"
default: return StringRef();
}
}
#define FUNC(T) \
bool ASTNode::is##T(T##Kind Kind) const { \
if (!is<T*>()) \
return false; \
return get<T*>()->getKind() == Kind; \
}
FUNC(Stmt)
FUNC(Expr)
FUNC(Decl)
FUNC(Pattern)
#undef FUNC
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