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SyntaxModel.cpp
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//===--- SyntaxModel.cpp - Routines for IDE syntax model ------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "swift/IDE/SyntaxModel.h"
#include "swift/Basic/Defer.h"
#include "swift/AST/ASTContext.h"
#include "swift/AST/ASTWalker.h"
#include "swift/AST/Decl.h"
#include "swift/AST/Expr.h"
#include "swift/AST/NameLookup.h"
#include "swift/AST/Pattern.h"
#include "swift/AST/ParameterList.h"
#include "swift/AST/Module.h"
#include "swift/AST/SourceFile.h"
#include "swift/AST/Stmt.h"
#include "swift/AST/TypeRepr.h"
#include "swift/Basic/SourceManager.h"
#include "swift/Parse/Lexer.h"
#include "swift/Parse/Token.h"
#include "swift/Config.h"
#include "swift/Subsystems.h"
#include "clang/Basic/CharInfo.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/Support/MemoryBuffer.h"
#include <vector>
#include <regex>
using namespace swift;
using namespace ide;
void SyntaxModelWalker::anchor() {}
struct SyntaxModelContext::Implementation {
SourceFile &SrcFile;
const LangOptions &LangOpts;
const SourceManager &SrcMgr;
std::vector<SyntaxNode> TokenNodes;
Implementation(SourceFile &SrcFile)
: SrcFile(SrcFile),
LangOpts(SrcFile.getASTContext().LangOpts),
SrcMgr(SrcFile.getASTContext().SourceMgr) {}
};
/// Matches the tokens in the argument of an image or file literal expression if
/// its argument is itself a literal string, e.g:
/// #imageLiteral(resourceName: "foo.png")
/// #fileLiteral(resourceName: "foo.txt")
/// If the given tokens start with the expected tokens and they all appear on
/// the same line, the source location beyond the final matched token and
/// number of matched tokens are returned. Otherwise None is returned.
static llvm::Optional<Located<unsigned>>
matchImageOrFileLiteralArg(ArrayRef<Token> Tokens) {
const unsigned NUM_TOKENS = 5;
if (Tokens.size() < NUM_TOKENS)
return llvm::None;
const tok kinds[NUM_TOKENS] = {
tok::l_paren,
tok::identifier, tok::colon, tok::string_literal,
tok::r_paren
};
for (unsigned i = 0; i < NUM_TOKENS; ++i) {
// FIXME: some editors don't handle multi-line object literals very well,
// so don't report them as object literals for now.
if (Tokens[i].getKind() != kinds[i] || Tokens[i].isAtStartOfLine())
return llvm::None;
}
if (Tokens[1].getText() != "resourceName")
return llvm::None;
auto EndToken = Tokens[NUM_TOKENS-1];
return Located<unsigned>(NUM_TOKENS, EndToken.getLoc().getAdvancedLoc(EndToken.getLength()));
}
/// Matches the tokens in the argument of an image literal expression if its
/// arguments are themselves number literals, e.g:
/// #colorLiteral(red: 1.0, green: 1.0, blue: 0.5, alpha: 1.0)
/// If the given tokens start with the expected tokens and they all appear on
/// the same line, the source location beyond the final matched token and number
/// of matched tokens are returned. Otherwise None is returned.
static llvm::Optional<Located<unsigned>>
matchColorLiteralArg(ArrayRef<Token> Tokens) {
const unsigned NUM_TOKENS = 17;
if (Tokens.size() < NUM_TOKENS)
return llvm::None;
const tok kinds[NUM_TOKENS] = {
tok::l_paren,
tok::identifier, tok::colon, tok::floating_literal, tok::comma,
tok::identifier, tok::colon, tok::floating_literal, tok::comma,
tok::identifier, tok::colon, tok::floating_literal, tok::comma,
tok::identifier, tok::colon, tok::floating_literal,
tok::r_paren
};
for (unsigned i = 0; i < NUM_TOKENS; ++i) {
auto Kind = Tokens[i].getKind();
if (Kind == tok::integer_literal)
Kind = tok::floating_literal;
// FIXME: some editors don't handle multi-line object literals very well,
// so don't report them as object literals for now.
if (Kind != kinds[i] || Tokens[i].isAtStartOfLine())
return llvm::None;
}
if (Tokens[1].getText() != "red" || Tokens[5].getText() != "green" ||
Tokens[9].getText() != "blue" || Tokens[13].getText() != "alpha")
return llvm::None;
auto EndToken = Tokens[NUM_TOKENS-1];
return Located<unsigned>(NUM_TOKENS, EndToken.getLoc().getAdvancedLoc(EndToken.getLength()));
}
SyntaxModelContext::SyntaxModelContext(SourceFile &SrcFile)
: Impl(*new Implementation(SrcFile)) {
const bool IsPlayground = Impl.LangOpts.Playground;
const SourceManager &SM = Impl.SrcMgr;
ArrayRef<Token> Tokens = SrcFile.getAllTokens();
std::vector<SyntaxNode> Nodes;
SourceLoc AttrLoc;
SourceLoc UnaryMinusLoc;
for (unsigned I = 0, E = Tokens.size(); I != E; ++I) {
auto &Tok = Tokens[I];
// Ignore empty string literals between interpolations, e.g. "\(1)\(2)"
if (!Tok.getLength())
continue;
SyntaxNodeKind Kind;
SourceLoc Loc;
llvm::Optional<unsigned> Length;
if (AttrLoc.isValid()) {
// This token is following @, see if it's a known attribute name.
// Type attribute, decl attribute, or '@unknown' for swift case statement.
if (TypeAttribute::getAttrKindFromString(Tok.getText()).has_value() ||
DeclAttribute::getAttrKindFromString(Tok.getText()).has_value() ||
Tok.getText() == "unknown") {
// It's a known attribute, so treat it as a syntactic attribute node for
// syntax coloring. If swift gets user attributes then all identifiers
// will be treated as syntactic attribute nodes.
Loc = AttrLoc;
Length = SM.getByteDistance(Loc, Tok.getLoc()) + Tok.getLength();
Kind = SyntaxNodeKind::AttributeId;
}
AttrLoc = SourceLoc();
}
if (!Loc.isValid()) {
Loc = Tok.getLoc();
Length = Tok.getLength();
switch(Tok.getKind()) {
#define KEYWORD(X) case tok::kw_##X:
#include "swift/AST/TokenKinds.def"
#undef KEYWORD
case tok::contextual_keyword:
Kind = SyntaxNodeKind::Keyword;
break;
// Note: the below only handles object literals where each argument is a
// single literal. If the arguments are more complex than that we rely on
// there being an ObjectLiteralExpr in the AST and convert the individual
// tokens within its range into a single object literal in
// ModelASTWalker. We only bother with the below so that in the most
// common cases we still present object literals as object literals when
// the ObjectLiteralExpr doesn't appear in the AST (which can happen when
// they appear within an invalid expression).
case tok::pound_fileLiteral:
case tok::pound_imageLiteral:
if (auto Match = matchImageOrFileLiteralArg(Tokens.slice(I+1))) {
Kind = SyntaxNodeKind::ObjectLiteral;
Length = SM.getByteDistance(Loc, Match->Loc);
// skip over the extra matched tokens
I += Match->Item - 1;
} else {
Kind = SyntaxNodeKind::Keyword;
}
break;
case tok::pound_colorLiteral:
if (auto Match = matchColorLiteralArg(Tokens.slice(I+1))) {
Kind = SyntaxNodeKind::ObjectLiteral;
Length = SM.getByteDistance(Loc, Match->Loc);
// skip over the matches tokens
I += Match->Item - 1;
} else {
Kind = SyntaxNodeKind::Keyword;
}
break;
#define POUND_COND_DIRECTIVE_KEYWORD(Name) case tok::pound_##Name:
#include "swift/AST/TokenKinds.def"
Kind = SyntaxNodeKind::BuildConfigKeyword;
break;
#define POUND_DIRECTIVE_KEYWORD(Name) case tok::pound_##Name:
#define POUND_COND_DIRECTIVE_KEYWORD(Name)
#include "swift/AST/TokenKinds.def"
Kind = SyntaxNodeKind::PoundDirectiveKeyword;
break;
#define POUND_OBJECT_LITERAL(Name, Desc, Proto)
#define POUND_DIRECTIVE_KEYWORD(Name)
#define POUND_KEYWORD(Name) case tok::pound_##Name:
#include "swift/AST/TokenKinds.def"
Kind = SyntaxNodeKind::Keyword;
break;
case tok::identifier:
if (Tok.getText().startswith("<#"))
Kind = SyntaxNodeKind::EditorPlaceholder;
else
Kind = SyntaxNodeKind::Identifier;
break;
case tok::dollarident: Kind = SyntaxNodeKind::DollarIdent; break;
case tok::string_literal: Kind = SyntaxNodeKind::String; break;
case tok::integer_literal:
Kind = SyntaxNodeKind::Integer;
if (UnaryMinusLoc.isValid()) {
Loc = UnaryMinusLoc;
Length = *Length + SM.getByteDistance(UnaryMinusLoc, Tok.getLoc());
}
break;
case tok::floating_literal:
Kind = SyntaxNodeKind::Floating;
if (UnaryMinusLoc.isValid()) {
Loc = UnaryMinusLoc;
Length = *Length + SM.getByteDistance(UnaryMinusLoc, Tok.getLoc());
}
break;
case tok::oper_prefix:
if (Tok.getText() == "-" && I != E &&
(Tokens[I+1].getKind() == tok::integer_literal ||
Tokens[I+1].getKind() == tok::floating_literal)) {
UnaryMinusLoc = Loc;
continue;
} else {
Kind = SyntaxNodeKind::Operator;
break;
}
case tok::oper_postfix:
case tok::oper_binary_spaced:
case tok::oper_binary_unspaced:
Kind = SyntaxNodeKind::Operator;
break;
case tok::comment:
if (Tok.getText().startswith("///") ||
(IsPlayground && Tok.getText().startswith("//:")))
Kind = SyntaxNodeKind::DocCommentLine;
else if (Tok.getText().startswith("/**") ||
(IsPlayground && Tok.getText().startswith("/*:")))
Kind = SyntaxNodeKind::DocCommentBlock;
else if (Tok.getText().startswith("//"))
Kind = SyntaxNodeKind::CommentLine;
else
Kind = SyntaxNodeKind::CommentBlock;
break;
case tok::at_sign:
// Set the location of @ and continue. Next token should be the
// attribute name.
AttrLoc = Tok.getLoc();
continue;
case tok::string_interpolation_anchor: {
Kind = SyntaxNodeKind::StringInterpolationAnchor;
break;
}
case tok::unknown: {
if (Tok.getRawText().ltrim('#').startswith("\"")) {
// This is likely an invalid single-line ("), multi-line ("""),
// or raw (#", ##", #""", etc.) string literal.
Kind = SyntaxNodeKind::String;
break;
}
continue;
}
default:
continue;
}
}
UnaryMinusLoc = SourceLoc(); // Reset.
assert(Loc.isValid());
assert(Nodes.empty() || SM.isBeforeInBuffer(Nodes.back().Range.getStart(),
Loc));
Nodes.emplace_back(Kind, CharSourceRange(Loc, Length.value()));
}
Impl.TokenNodes = std::move(Nodes);
}
SyntaxModelContext::~SyntaxModelContext() {
delete &Impl;
}
namespace {
using ASTNodeType = ASTWalker::ParentTy;
struct StructureElement {
SyntaxStructureNode StructureNode;
ASTNodeType ASTNode;
StructureElement(const SyntaxStructureNode &StructureNode,
const ASTNodeType &ASTNode)
:StructureNode(StructureNode), ASTNode(ASTNode) { }
};
static const std::vector<std::string> URLProtocols = {
// Use RegexStrURL:
"acap", "afp", "afs", "cid", "data", "fax", "feed", "file", "ftp", "go",
"gopher", "http", "https", "imap", "ldap", "mailserver", "mid", "modem",
"news", "nntp", "opaquelocktoken", "pop", "prospero", "rdar", "rtsp", "service",
"sip", "soap.beep", "soap.beeps", "tel", "telnet", "tip", "tn3270", "urn",
"vemmi", "wais", "xcdoc", "z39.50r","z39.50s",
// Use RegexStrMailURL:
"mailto", "im",
// Use RegexStrRadarURL:
"radar"
};
static const char *const RegexStrURL =
"(acap|afp|afs|cid|data|fax|feed|file|ftp|go|"
"gopher|http|https|imap|ldap|mailserver|mid|modem|news|nntp|opaquelocktoken|"
"pop|prospero|rdar|rtsp|service|sip|soap\\.beep|soap\\.beeps|tel|telnet|tip|"
"tn3270|urn|vemmi|wais|xcdoc|z39\\.50r|z39\\.50s)://"
"([a-zA-Z0-9\\-_.]+/)?[a-zA-Z0-9;/?:@\\&=+$,\\-_.!~*'()%#]+";
static const char *const RegexStrMailURL =
"(mailto|im):[a-zA-Z0-9\\-_]+@[a-zA-Z0-9\\-_\\.!%]+";
static const char *const RegexStrRadarURL =
"radar:[a-zA-Z0-9;/?:@\\&=+$,\\-_.!~*'()%#]+";
class ModelASTWalker : public ASTWalker {
ArrayRef<Token> AllTokensInFile;
const LangOptions &LangOpts;
const SourceManager &SM;
unsigned BufferID;
ASTContext &Ctx;
std::vector<StructureElement> SubStructureStack;
SourceLoc LastLoc;
static const std::regex &getURLRegex(StringRef Protocol);
llvm::Optional<SyntaxNode> parseFieldNode(StringRef Text, StringRef OrigText,
SourceLoc OrigLoc);
llvm::DenseSet<ASTNode> NodesVisitedBefore;
/// When non-zero, we should avoid passing tokens as syntax nodes since a parent of several tokens
/// is considered as one, e.g. object literal expression.
uint8_t AvoidPassingSyntaxToken = 0;
class InactiveClauseRAII {
const bool wasInInactiveClause;
bool &isInInactiveClause;
public:
InactiveClauseRAII(bool &isInInactiveClauseArg, bool enteringInactiveClause)
: wasInInactiveClause(isInInactiveClauseArg),
isInInactiveClause(isInInactiveClauseArg) {
isInInactiveClause |= enteringInactiveClause;
}
~InactiveClauseRAII() { isInInactiveClause = wasInInactiveClause; }
};
friend class InactiveClauseRAII;
bool inInactiveClause = false;
public:
SyntaxModelWalker &Walker;
ArrayRef<SyntaxNode> TokenNodes;
ModelASTWalker(const SourceFile &File, SyntaxModelWalker &Walker)
: AllTokensInFile(File.getAllTokens()),
LangOpts(File.getASTContext().LangOpts),
SM(File.getASTContext().SourceMgr),
BufferID(File.getBufferID().value()),
Ctx(File.getASTContext()),
Walker(Walker) { }
// FIXME: Remove this
bool shouldWalkAccessorsTheOldWay() override { return true; }
/// Only walk the arguments of a macro, to represent the source as written.
MacroWalking getMacroWalkingBehavior() const override {
return MacroWalking::Arguments;
}
void visitSourceFile(SourceFile &SrcFile, ArrayRef<SyntaxNode> Tokens);
PreWalkAction walkToArgumentPre(const Argument &Arg) override;
PreWalkResult<Expr *> walkToExprPre(Expr *E) override;
PostWalkResult<Expr *> walkToExprPost(Expr *E) override;
PreWalkResult<Stmt *> walkToStmtPre(Stmt *S) override;
PostWalkResult<Stmt *> walkToStmtPost(Stmt *S) override;
PreWalkAction walkToDeclPre(Decl *D) override;
PostWalkAction walkToDeclPost(Decl *D) override;
PreWalkAction walkToTypeReprPre(TypeRepr *T) override;
bool shouldWalkIntoGenericParams() override { return true; }
private:
static bool findUrlStartingLoc(StringRef Text, unsigned &Start,
std::regex& Regex);
bool annotateIfConfigConditionIdentifiers(Expr *Cond);
bool handleAttrs(const ParsedDeclAttributes &Attrs);
bool handleAttrs(ArrayRef<TypeOrCustomAttr> Attrs);
using DeclAttributeAndRange = std::pair<const DeclAttribute *, SourceRange>;
bool handleSpecialDeclAttribute(const DeclAttribute *Decl,
ArrayRef<Token> Toks);
bool handleAttrRanges(ArrayRef<DeclAttributeAndRange> DeclRanges);
bool shouldPassBraceStructureNode(BraceStmt *S);
enum PassNodesBehavior {
/// Pass all nodes up to but not including the location.
ExcludeNodeAtLocation,
/// Pass all nodes up to and including the location.
IncludeNodeAtLocation,
/// Like ExcludeNodeAtLocation, and skip past any node at the location.
DisplaceNodeAtLocation
};
struct PassUntilResult {
bool shouldContinue;
llvm::Optional<SyntaxNode> MatchedToken;
};
PassUntilResult
passTokenNodesUntil(SourceLoc Loc, PassNodesBehavior Pass);
bool passNonTokenNode(const SyntaxNode &Node);
bool passNode(const SyntaxNode &Node);
bool pushStructureNode(const SyntaxStructureNode &Node,
const ASTNodeType& ASTNode);
bool popStructureNode();
bool processComment(CharSourceRange Range);
bool searchForURL(CharSourceRange Range);
bool findFieldsInDocCommentLine(SyntaxNode Node);
bool findFieldsInDocCommentBlock(SyntaxNode Node);
bool isVisitedBefore(ASTNode Node) {
return NodesVisitedBefore.count(Node) > 0;
}
};
const std::regex &ModelASTWalker::getURLRegex(StringRef Pro) {
static const std::regex Regexes[3] = {
std::regex{ RegexStrURL, std::regex::ECMAScript | std::regex::nosubs },
std::regex{ RegexStrMailURL, std::regex::ECMAScript | std::regex::nosubs },
std::regex{ RegexStrRadarURL, std::regex::ECMAScript | std::regex::nosubs }
};
static const auto MailToPosition = std::find(URLProtocols.begin(),
URLProtocols.end(),
"mailto");
static const auto RadarPosition = std::find(URLProtocols.begin(),
URLProtocols.end(),
"radar");
auto Found = std::find(URLProtocols.begin(), URLProtocols.end(), Pro);
assert(Found != URLProtocols.end() && "bad protocol name");
if (Found < MailToPosition)
return Regexes[0];
else if (Found < RadarPosition)
return Regexes[1];
else
return Regexes[2];
}
SyntaxStructureKind syntaxStructureKindFromNominalTypeDecl(NominalTypeDecl *N) {
if (isa<ClassDecl>(N))
return SyntaxStructureKind::Class;
else if (isa<StructDecl>(N))
return SyntaxStructureKind::Struct;
else if (isa<ProtocolDecl>(N))
return SyntaxStructureKind::Protocol;
else {
// All other known NominalTypeDecl derived classes covered, so assert() here.
assert(isa<EnumDecl>(N));
return SyntaxStructureKind::Enum;
}
}
CharSourceRange charSourceRangeFromSourceRange(const SourceManager &SM,
const SourceRange &SR) {
return Lexer::getCharSourceRangeFromSourceRange(SM, SR);
}
CharSourceRange innerCharSourceRangeFromSourceRange(const SourceManager &SM,
const SourceRange &SR) {
if (SR.isInvalid())
return CharSourceRange();
SourceLoc SRS = Lexer::getLocForEndOfToken(SM, SR.Start);
return CharSourceRange(SM, SRS, (SR.End != SR.Start) ? SR.End : SRS);
}
static void setDecl(SyntaxStructureNode &N, Decl *D) {
N.Dcl = D;
N.Attrs = D->getParsedAttrs();
N.DocRange = D->getRawComment().getCharSourceRange();
}
} // anonymous namespace
bool SyntaxModelContext::walk(SyntaxModelWalker &Walker) {
ModelASTWalker ASTWalk(Impl.SrcFile, Walker);
ASTWalk.visitSourceFile(Impl.SrcFile, Impl.TokenNodes);
return true;
}
void ModelASTWalker::visitSourceFile(SourceFile &SrcFile,
ArrayRef<SyntaxNode> Tokens) {
TokenNodes = Tokens;
SrcFile.walk(*this);
// Pass the rest of the token nodes.
for (auto &TokNode : TokenNodes)
passNode(TokNode);
}
static bool shouldTreatAsSingleToken(const SyntaxStructureNode &Node,
const SourceManager &SM) {
// Avoid passing the individual syntax tokens corresponding to single-line
// object literal expressions, as they will be reported as a single token.
return Node.Kind == SyntaxStructureKind::ObjectLiteralExpression &&
SM.getLineAndColumnInBuffer(Node.Range.getStart()).first ==
SM.getLineAndColumnInBuffer(Node.Range.getEnd()).first;
}
ASTWalker::PreWalkAction
ModelASTWalker::walkToArgumentPre(const Argument &Arg) {
if (isVisitedBefore(Arg.getExpr()))
return Action::SkipChildren();
auto *Elem = Arg.getExpr();
if (isa<DefaultArgumentExpr>(Elem))
return Action::Continue();
auto NL = Arg.getLabelLoc();
auto Name = Arg.getLabel();
SyntaxStructureNode SN;
SN.Kind = SyntaxStructureKind::Argument;
SN.BodyRange = charSourceRangeFromSourceRange(SM, Elem->getSourceRange());
if (NL.isValid() && !Name.empty()) {
SN.NameRange = CharSourceRange(NL, Name.getLength());
SN.Range = charSourceRangeFromSourceRange(
SM, SourceRange(NL, Elem->getEndLoc()));
passTokenNodesUntil(NL, ExcludeNodeAtLocation);
} else {
SN.Range = SN.BodyRange;
}
pushStructureNode(SN, Elem);
return Action::Continue();
}
ASTWalker::PreWalkResult<Expr *> ModelASTWalker::walkToExprPre(Expr *E) {
if (isVisitedBefore(E))
return Action::SkipChildren(E);
if (E->isImplicit())
return Action::Continue(E);
auto addExprElem = [&](const Expr *Elem, SyntaxStructureNode &SN) {
if (isa<ErrorExpr>(Elem))
return;
SourceRange R = Elem->getSourceRange();
if (R.isInvalid())
return;
SN.Elements.emplace_back(SyntaxStructureElementKind::Expr,
charSourceRangeFromSourceRange(SM, R));
};
if (auto *CE = dyn_cast<CallExpr>(E)) {
SyntaxStructureNode SN;
SN.Kind = SyntaxStructureKind::CallExpression;
SN.Range = charSourceRangeFromSourceRange(SM, E->getSourceRange());
if (CE->getFn() && CE->getFn()->getSourceRange().isValid())
SN.NameRange = charSourceRangeFromSourceRange(SM,
CE->getFn()->getSourceRange());
if (CE->getArgs()->getSourceRange().isValid())
SN.BodyRange = innerCharSourceRangeFromSourceRange(
SM, CE->getArgs()->getSourceRange());
pushStructureNode(SN, CE);
} else if (auto *SE = dyn_cast<SubscriptExpr>(E)) {
SyntaxStructureNode SN;
SN.Kind = SyntaxStructureKind::CallExpression;
SN.Range = charSourceRangeFromSourceRange(SM, E->getSourceRange());
SN.NameRange =
charSourceRangeFromSourceRange(SM, SE->getBase()->getSourceRange());
if (SE->getArgs()->getSourceRange().isValid())
SN.BodyRange = innerCharSourceRangeFromSourceRange(
SM, SE->getArgs()->getSourceRange());
pushStructureNode(SN, SE);
} else if (auto *ObjectE = dyn_cast<ObjectLiteralExpr>(E)) {
SyntaxStructureNode SN;
SN.Kind = SyntaxStructureKind::ObjectLiteralExpression;
SN.Range = charSourceRangeFromSourceRange(SM, ObjectE->getSourceRange());
SourceLoc NRStart = ObjectE->getSourceLoc().getAdvancedLoc(1);
SourceLoc NREnd =
NRStart.getAdvancedLoc(ObjectE->getLiteralKindRawName().size());
SN.NameRange = CharSourceRange(SM, NRStart, NREnd);
SN.BodyRange =
innerCharSourceRangeFromSourceRange(SM, ObjectE->getSourceRange());
// Consider the object literal as a single syntax token for highlighting if
// it spans a single line.
if (shouldTreatAsSingleToken(SN, SM))
passNonTokenNode({SyntaxNodeKind::ObjectLiteral, SN.Range});
pushStructureNode(SN, E);
} else if (auto *ArrayE = dyn_cast<ArrayExpr>(E)) {
SyntaxStructureNode SN;
SN.Kind = SyntaxStructureKind::ArrayExpression;
SN.Range = charSourceRangeFromSourceRange(SM, E->getSourceRange());
for (auto *Elem : ArrayE->getElements())
addExprElem(Elem, SN);
SN.BodyRange = innerCharSourceRangeFromSourceRange(SM, E->getSourceRange());
pushStructureNode(SN, E);
} else if (auto *DictE = dyn_cast<DictionaryExpr>(E)) {
SyntaxStructureNode SN;
SN.Kind = SyntaxStructureKind::DictionaryExpression;
SN.Range = charSourceRangeFromSourceRange(SM, E->getSourceRange());
for (auto *Elem : DictE->getElements()) {
if (auto *TupleE = dyn_cast<TupleExpr>(Elem)) {
for (auto *TE : TupleE->getElements())
addExprElem(TE, SN);
} else {
addExprElem(Elem, SN);
}
}
SN.BodyRange = innerCharSourceRangeFromSourceRange(SM, E->getSourceRange());
pushStructureNode(SN, E);
} else if (auto *Tup = dyn_cast<TupleExpr>(E)) {
SyntaxStructureNode SN;
SN.Kind = SyntaxStructureKind::TupleExpression;
SN.Range = charSourceRangeFromSourceRange(SM, Tup->getSourceRange());
SN.BodyRange =
innerCharSourceRangeFromSourceRange(SM, Tup->getSourceRange());
for (auto *Elem : Tup->getElements()) {
addExprElem(Elem, SN);
}
pushStructureNode(SN, Tup);
} else if (auto *Closure = dyn_cast<ClosureExpr>(E)) {
SyntaxStructureNode SN;
SN.Kind = SyntaxStructureKind::ClosureExpression;
SN.Range = charSourceRangeFromSourceRange(SM, E->getSourceRange());
SN.BodyRange = innerCharSourceRangeFromSourceRange(SM, E->getSourceRange());
if (Closure->hasExplicitResultType())
SN.TypeRange = charSourceRangeFromSourceRange(SM,
Closure->getExplicitResultTypeRepr()->getSourceRange());
pushStructureNode(SN, Closure);
} else if (auto SE = dyn_cast<SequenceExpr>(E)) {
// In SequenceExpr, explicit cast expressions (e.g. 'as', 'is') appear
// twice. Skip pointers we've already seen.
SmallPtrSet<Expr *, 5> seenExpr;
for (auto subExpr : SE->getElements()) {
if (!seenExpr.insert(subExpr).second) {
continue;
}
llvm::SaveAndRestore<ASTWalker::ParentTy> SetParent(Parent, E);
subExpr->walk(*this);
}
// TODO: We should consider changing Action::SkipChildren to still call
// walkToExprPost, which would eliminate the need for this.
auto postWalkResult = walkToExprPost(SE);
switch (postWalkResult.Action.Action) {
case PostWalkAction::Stop:
return Action::Stop();
case PostWalkAction::Continue:
// We already visited the children.
return Action::SkipChildren(*postWalkResult.Value);
}
llvm_unreachable("Unhandled case in switch!");
} else if (auto *ISL = dyn_cast<InterpolatedStringLiteralExpr>(E)) {
// Don't visit the child expressions directly. Instead visit the arguments
// of each appendStringLiteral/appendInterpolation CallExpr so we don't
// try to output structure nodes for those calls.
llvm::SaveAndRestore<ASTWalker::ParentTy> SetParent(Parent, E);
ISL->forEachSegment(Ctx, [&](bool isInterpolation, CallExpr *CE) {
if (isInterpolation) {
for (auto arg : *CE->getArgs())
arg.getExpr()->walk(*this);
}
});
// TODO: We should consider changing Action::SkipChildren to still call
// walkToExprPost, which would eliminate the need for this.
auto postWalkResult = walkToExprPost(E);
switch (postWalkResult.Action.Action) {
case PostWalkAction::Stop:
return Action::Stop();
case PostWalkAction::Continue:
// We already visited the children.
return Action::SkipChildren(*postWalkResult.Value);
}
llvm_unreachable("Unhandled case in switch!");
}
return Action::Continue(E);
}
ASTWalker::PostWalkResult<Expr *> ModelASTWalker::walkToExprPost(Expr *E) {
while (!SubStructureStack.empty() &&
SubStructureStack.back().ASTNode.getAsExpr() == E)
popStructureNode();
return Action::Continue(E);
}
ASTWalker::PreWalkResult<Stmt *> ModelASTWalker::walkToStmtPre(Stmt *S) {
if (isVisitedBefore(S)) {
return Action::SkipChildren(S);
}
auto addExprElem = [&](SyntaxStructureElementKind K, const Expr *Elem,
SyntaxStructureNode &SN) {
if (isa<ErrorExpr>(Elem))
return;
SourceRange R = Elem->getSourceRange();
if (R.isInvalid())
return;
SN.Elements.emplace_back(K, charSourceRangeFromSourceRange(SM, R));
};
if (auto *ForEachS = dyn_cast<ForEachStmt>(S)) {
SyntaxStructureNode SN;
SN.Kind = SyntaxStructureKind::ForEachStatement;
SN.Range = charSourceRangeFromSourceRange(SM, S->getSourceRange());
if (ForEachS->getPattern()) {
auto Pat = ForEachS->getPattern();
if (!Pat->isImplicit()) {
SourceRange ElemRange = Pat->getSourceRange();
SN.Elements.emplace_back(SyntaxStructureElementKind::Id,
charSourceRangeFromSourceRange(SM, ElemRange));
}
}
if (auto *S = ForEachS->getParsedSequence())
addExprElem(SyntaxStructureElementKind::Expr, S, SN);
pushStructureNode(SN, S);
} else if (auto *WhileS = dyn_cast<WhileStmt>(S)) {
SyntaxStructureNode SN;
SN.Kind = SyntaxStructureKind::WhileStatement;
SN.Range = charSourceRangeFromSourceRange(SM, S->getSourceRange());
if (!WhileS->getCond().empty()) {
auto Conds = WhileS->getCond();
SourceRange ElemRange = SourceRange(Conds.front().getSourceRange().Start,
Conds.back().getSourceRange().End);
SN.Elements.emplace_back(SyntaxStructureElementKind::ConditionExpr,
charSourceRangeFromSourceRange(SM, ElemRange));
}
pushStructureNode(SN, S);
} else if (auto *RepeatWhileS = dyn_cast<RepeatWhileStmt>(S)) {
SyntaxStructureNode SN;
SN.Kind = SyntaxStructureKind::RepeatWhileStatement;
SN.Range = charSourceRangeFromSourceRange(SM, S->getSourceRange());
if (RepeatWhileS->getCond()) {
addExprElem(SyntaxStructureElementKind::Expr, RepeatWhileS->getCond(), SN);
}
pushStructureNode(SN, S);
} else if (auto *IfS = dyn_cast<IfStmt>(S)) {
SyntaxStructureNode SN;
SN.Kind = SyntaxStructureKind::IfStatement;
SN.Range = charSourceRangeFromSourceRange(SM, S->getSourceRange());
if (!IfS->getCond().empty()) {
auto Conds = IfS->getCond();
SourceRange ElemRange = SourceRange(Conds.front().getSourceRange().Start,
Conds.back().getSourceRange().End);
SN.Elements.emplace_back(SyntaxStructureElementKind::ConditionExpr,
charSourceRangeFromSourceRange(SM, ElemRange));
}
pushStructureNode(SN, S);
} else if (auto *GS = dyn_cast<GuardStmt>(S)) {
SyntaxStructureNode SN;
SN.Kind = SyntaxStructureKind::GuardStatement;
SN.Range = charSourceRangeFromSourceRange(SM, S->getSourceRange());
if (!GS->getCond().empty()) {
auto Conds = GS->getCond();
SourceRange ElemRange = SourceRange(Conds.front().getSourceRange().Start,
Conds.back().getSourceRange().End);
SN.Elements.emplace_back(SyntaxStructureElementKind::ConditionExpr,
charSourceRangeFromSourceRange(SM, ElemRange));
}
pushStructureNode(SN, S);
} else if (auto *SwitchS = dyn_cast<SwitchStmt>(S)) {
SyntaxStructureNode SN;
SN.Kind = SyntaxStructureKind::SwitchStatement;
SN.Range = charSourceRangeFromSourceRange(SM, S->getSourceRange());
if (SwitchS->getSubjectExpr()) {
addExprElem(SyntaxStructureElementKind::Expr, SwitchS->getSubjectExpr(),
SN);
}
pushStructureNode(SN, S);
} else if (auto *CaseS = dyn_cast<CaseStmt>(S)) {
SyntaxStructureNode SN;
SN.Kind = SyntaxStructureKind::CaseStatement;
SN.Range = charSourceRangeFromSourceRange(SM, S->getSourceRange());
for (const CaseLabelItem &Item : CaseS->getCaseLabelItems()) {
SN.Elements.emplace_back(SyntaxStructureElementKind::Pattern,
charSourceRangeFromSourceRange(SM,
Item.getSourceRange()));
}
pushStructureNode(SN, S);
} else if (isa<BraceStmt>(S) && shouldPassBraceStructureNode(cast<BraceStmt>(S))) {
// Pass BraceStatement structure node.
SyntaxStructureNode SN;
SN.Kind = SyntaxStructureKind::BraceStatement;
SN.Range = charSourceRangeFromSourceRange(SM, S->getSourceRange());
SN.BodyRange = innerCharSourceRangeFromSourceRange(SM,
S->getSourceRange());
pushStructureNode(SN, S);
} else if (auto *SW = dyn_cast<SwitchStmt>(S)) {
if (SW->getLBraceLoc().isValid() && SW->getRBraceLoc().isValid()) {
SourceRange BraceRange(SW->getLBraceLoc(), SW->getRBraceLoc());
SyntaxStructureNode SN;
SN.Kind = SyntaxStructureKind::BraceStatement;
SN.Range = charSourceRangeFromSourceRange(SM, BraceRange);
SN.BodyRange = innerCharSourceRangeFromSourceRange(SM, BraceRange);
pushStructureNode(SN, SW);
}
} else if (auto *DeferS = dyn_cast<DeferStmt>(S)) {
// Since 'DeferStmt::getTempDecl()' is marked as implicit, we manually walk
// into the body.
if (auto *FD = DeferS->getTempDecl()) {
if (auto *Body = FD->getBody()) {
auto *RetS = Body->walk(*this);
assert(RetS == Body);
(void)RetS;
}
walkToStmtPost(DeferS);
}
// Already walked children.
return Action::SkipChildren(DeferS);
}
return Action::Continue(S);
}
ASTWalker::PostWalkResult<Stmt *> ModelASTWalker::walkToStmtPost(Stmt *S) {
while (!SubStructureStack.empty() &&
SubStructureStack.back().ASTNode.getAsStmt() == S)
popStructureNode();
return Action::Continue(S);
}
ASTWalker::PreWalkAction ModelASTWalker::walkToDeclPre(Decl *D) {
if (isVisitedBefore(D))
return Action::SkipChildren();
if (D->isImplicit())
return Action::SkipChildren();
// The attributes of EnumElementDecls and VarDecls are handled when visiting
// their parent EnumCaseDecl/PatternBindingDecl (which the attributes are
// attached to syntactically).
if (!isa<EnumElementDecl>(D) &&
!(isa<VarDecl>(D) && cast<VarDecl>(D)->getParentPatternBinding())) {
if (!handleAttrs(D->getParsedAttrs()))
return Action::SkipChildren();
}
if (isa<AccessorDecl>(D)) {
// Don't push structure nodes for accessors.
} else if (auto *AFD = dyn_cast<AbstractFunctionDecl>(D)) {
// Pass Function / Method structure node.
SyntaxStructureNode SN;
setDecl(SN, D);
const DeclContext *DC = AFD->getDeclContext();
auto *FD = dyn_cast<FuncDecl>(AFD);
if (DC->isTypeContext()) {
if (FD && FD->isStatic()) {
if (FD->getStaticSpelling() == StaticSpellingKind::KeywordClass)
SN.Kind = SyntaxStructureKind::ClassFunction;
else
SN.Kind = SyntaxStructureKind::StaticFunction;
} else {
SN.Kind = SyntaxStructureKind::InstanceFunction;
}
}
else
SN.Kind = SyntaxStructureKind::FreeFunction;
SN.Range = charSourceRangeFromSourceRange(SM, AFD->getSourceRange());
SN.BodyRange = innerCharSourceRangeFromSourceRange(SM,
AFD->getBodySourceRange());
SN.NameRange = charSourceRangeFromSourceRange(SM,
AFD->getSignatureSourceRange());
if (FD) {
SN.TypeRange = charSourceRangeFromSourceRange(SM,
FD->getResultTypeSourceRange());
}
pushStructureNode(SN, AFD);
} else if (auto *NTD = dyn_cast<NominalTypeDecl>(D)) {
SyntaxStructureNode SN;
setDecl(SN, D);
SN.Kind = syntaxStructureKindFromNominalTypeDecl(NTD);
SN.Range = charSourceRangeFromSourceRange(SM, NTD->getSourceRange());
SN.BodyRange = innerCharSourceRangeFromSourceRange(SM, NTD->getBraces());
SourceLoc NRStart = NTD->getNameLoc();
SourceLoc NREnd = NRStart.getAdvancedLoc(NTD->getName().getLength());
SN.NameRange = CharSourceRange(SM, NRStart, NREnd);
for (const TypeLoc &TL : NTD->getInherited().getEntries()) {
CharSourceRange TR = charSourceRangeFromSourceRange(SM,
TL.getSourceRange());
SN.InheritedTypeRanges.push_back(TR);
SN.Elements.emplace_back(SyntaxStructureElementKind::TypeRef, TR);
}
pushStructureNode(SN, NTD);
} else if (auto *ED = dyn_cast<ExtensionDecl>(D)) {
SyntaxStructureNode SN;
setDecl(SN, D);
SN.Kind = SyntaxStructureKind::Extension;
SN.Range = charSourceRangeFromSourceRange(SM, ED->getSourceRange());
SN.BodyRange = innerCharSourceRangeFromSourceRange(SM, ED->getBraces());
SourceRange NSR = SourceRange();
if (auto *repr = ED->getExtendedTypeRepr())
NSR = repr->getSourceRange();
SN.NameRange = charSourceRangeFromSourceRange(SM, NSR);
for (const TypeLoc &TL : ED->getInherited().getEntries()) {
CharSourceRange TR = charSourceRangeFromSourceRange(SM,
TL.getSourceRange());
SN.InheritedTypeRanges.push_back(TR);
SN.Elements.emplace_back(SyntaxStructureElementKind::TypeRef, TR);
}
pushStructureNode(SN, ED);
} else if (auto *PD = dyn_cast<ParamDecl>(D)) {
SyntaxStructureNode SN;
SN.Dcl = D;
SN.Kind = SyntaxStructureKind::Parameter;
if (!PD->getArgumentName().empty()) {
SourceLoc ArgStart = PD->getSourceRange().Start;
SN.NameRange = CharSourceRange(ArgStart, PD->getArgumentName().getLength());
passTokenNodesUntil(ArgStart, PassNodesBehavior::ExcludeNodeAtLocation);
}
SN.Range = charSourceRangeFromSourceRange(SM, PD->getSourceRange());
SN.Attrs = PD->getParsedAttrs();
SN.TypeRange = charSourceRangeFromSourceRange(SM,
PD->getTypeSourceRangeForDiagnostics());
pushStructureNode(SN, PD);
} else if (auto *PBD = dyn_cast<PatternBindingDecl>(D)) {
// Process the attributes of one of the contained VarDecls. Attributes that
// are syntactically attached to the PatternBindingDecl end up on the
// contained VarDecls.
VarDecl *Contained = nullptr;
for (auto idx : range(PBD->getNumPatternEntries())) {
PBD->getPattern(idx)->forEachVariable([&](VarDecl *VD) -> void {
Contained = VD;
});
if (Contained) {
if (!handleAttrs(Contained->getParsedAttrs()))
return Action::SkipChildren();
break;
}
}
} else if (auto *VD = dyn_cast<VarDecl>(D)) {
const DeclContext *DC = VD->getDeclContext();
SyntaxStructureNode SN;
setDecl(SN, D);
SourceRange SR;
if (auto *PBD = VD->getParentPatternBinding())
SR = PBD->getSourceRange();
else
SR = VD->getSourceRange();
SN.Range = charSourceRangeFromSourceRange(SM, SR);
auto bracesRange = VD->getBracesRange();
if (bracesRange.isValid())
SN.BodyRange = innerCharSourceRangeFromSourceRange(SM, bracesRange);
SourceLoc NRStart = VD->getNameLoc();
SourceLoc NREnd = (!VD->getName().empty()
? NRStart.getAdvancedLoc(VD->getName().getLength())
: NRStart);
SN.NameRange = CharSourceRange(SM, NRStart, NREnd);
SN.TypeRange = charSourceRangeFromSourceRange(SM,
VD->getTypeSourceRangeForDiagnostics());
if (DC->isLocalContext()) {
SN.Kind = SyntaxStructureKind::LocalVariable;