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//===--- CompletionContextFinder.cpp --------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2022 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/Sema/CompletionContextFinder.h"
#include "swift/Parse/Lexer.h"
#include "swift/Sema/SyntacticElementTarget.h"
using namespace swift;
using namespace constraints;
using Fallback = CompletionContextFinder::Fallback;
CompletionContextFinder::CompletionContextFinder(
SyntacticElementTarget target, DeclContext *DC)
: InitialExpr(target.getAsExpr()), InitialDC(DC) {
assert(DC);
target.walk(*this);
}
ASTWalker::PreWalkResult<Expr *>
CompletionContextFinder::walkToExprPre(Expr *E) {
if (auto *closure = dyn_cast<ClosureExpr>(E)) {
// NOTE: We're querying hasSingleExpressionBody before the single-expression
// body transform has happened, so this won't take e.g SingleValueStmtExprs
// into account.
Contexts.push_back({closure->hasSingleExpressionBody()
? ContextKind::SingleStmtClosure
: ContextKind::MultiStmtClosure,
closure});
}
if (isa<InterpolatedStringLiteralExpr>(E)) {
Contexts.push_back({ContextKind::StringInterpolation, E});
}
if (isa<ApplyExpr>(E) || isa<SequenceExpr>(E) ||
isa<SingleValueStmtExpr>(E)) {
Contexts.push_back({ContextKind::FallbackExpression, E});
}
if (auto *Error = dyn_cast<ErrorExpr>(E)) {
Contexts.push_back({ContextKind::ErrorExpression, E});
if (auto *OrigExpr = Error->getOriginalExpr()) {
OrigExpr->walk(*this);
if (hasCompletionExpr())
return Action::Stop();
}
}
if (auto *CCE = dyn_cast<CodeCompletionExpr>(E)) {
CompletionNode = CCE;
return Action::Stop();
}
if (auto *KeyPath = dyn_cast<KeyPathExpr>(E)) {
for (auto &component : KeyPath->getComponents()) {
if (component.getKind() == KeyPathExpr::Component::Kind::CodeCompletion) {
CompletionNode = KeyPath;
return Action::Stop();
}
}
// Code completion in key paths is modelled by a code completion component
// Don't walk the key path's parsed expressions.
return Action::SkipNode(E);
}
return Action::Continue(E);
}
ASTWalker::PostWalkResult<Expr *>
CompletionContextFinder::walkToExprPost(Expr *E) {
if (isa<ClosureExpr>(E) || isa<InterpolatedStringLiteralExpr>(E) ||
isa<ApplyExpr>(E) || isa<SequenceExpr>(E) || isa<ErrorExpr>(E) ||
isa<SingleValueStmtExpr>(E)) {
assert(Contexts.back().E == E);
Contexts.pop_back();
}
return Action::Continue(E);
}
size_t CompletionContextFinder::getKeyPathCompletionComponentIndex() const {
size_t ComponentIndex = 0;
auto Components = getKeyPathContainingCompletionComponent()->getComponents();
for (auto &Component : Components) {
if (Component.getKind() == KeyPathExpr::Component::Kind::CodeCompletion) {
break;
} else {
ComponentIndex++;
}
}
assert(ComponentIndex < Components.size() &&
"No completion component in the key path?");
return ComponentIndex;
}
std::optional<Fallback>
CompletionContextFinder::getFallbackCompletionExpr() const {
if (!hasCompletionExpr()) {
// Creating a fallback expression only makes sense if we are completing in
// an expression, not when we're completing in a key path.
return std::nullopt;
}
std::optional<Fallback> fallback;
bool separatePrecheck = false;
DeclContext *fallbackDC = InitialDC;
// Find the outermost fallback expression within the innermost error
// expression or multi-statement closure, keeping track of its decl context.
for (auto context : Contexts) {
switch (context.Kind) {
case ContextKind::StringInterpolation:
LLVM_FALLTHROUGH;
case ContextKind::FallbackExpression:
if (!fallback && context.E != InitialExpr)
fallback = Fallback{context.E, fallbackDC, separatePrecheck};
continue;
case ContextKind::SingleStmtClosure:
if (!fallback && context.E != InitialExpr)
fallback = Fallback{context.E, fallbackDC, separatePrecheck};
fallbackDC = cast<AbstractClosureExpr>(context.E);
continue;
case ContextKind::MultiStmtClosure:
fallbackDC = cast<AbstractClosureExpr>(context.E);
LLVM_FALLTHROUGH;
case ContextKind::ErrorExpression:;
fallback = std::nullopt;
separatePrecheck = true;
continue;
}
}
if (fallback)
return fallback;
if (getCompletionExpr() != InitialExpr)
return Fallback{getCompletionExpr(), fallbackDC, separatePrecheck};
return std::nullopt;
}
bool swift::containsIDEInspectionTarget(SourceRange range,
const SourceManager &SourceMgr) {
if (range.isInvalid())
return false;
auto charRange = Lexer::getCharSourceRangeFromSourceRange(SourceMgr, range);
return SourceMgr.rangeContainsIDEInspectionTarget(charRange);
}
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