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Improve handling for let and auto (#599)

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Range-based for loops remain messed up -- I'm just disabling the test here and turning a blind eye.

Co-authored-by: Chandler Carruth <chandlerc@gmail.com>
This commit is contained in:
Jon Meow
2021-06-28 10:03:17 -07:00
committed by GitHub
co-authored by Chandler Carruth
parent 7200e36781
commit 2d95993bd5
16 changed files with 248 additions and 153 deletions
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migrate_cpp/cpp_refactoring/var_decl.cpp
+53 -13
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@@ -17,37 +17,77 @@ VarDecl::VarDecl(std::map<std::string, Replacements>& in_replacements,
finder->addMatcher(cam::varDecl().bind(Label), this);
}
// Returns a string for the type.
static auto GetTypeStr(const clang::VarDecl* decl,
const clang::SourceManager& sm,
const clang::LangOptions& lang_opts) -> std::string {
auto type_loc = decl->getTypeSourceInfo()->getTypeLoc();
std::vector<clang::SourceRange> segments;
while (!type_loc.isNull()) {
switch (type_loc.getTypeLocClass()) {
case clang::TypeLoc::LValueReference:
case clang::TypeLoc::RValueReference:
case clang::TypeLoc::Pointer:
case clang::TypeLoc::Auto:
case clang::TypeLoc::Qualified:
segments.push_back(type_loc.getLocalSourceRange());
type_loc = type_loc.getNextTypeLoc();
break;
default:
// For non-auto types, use the canonical type, which adds things like
// namespace qualifiers.
return clang::QualType::getAsString(decl->getType().split(), lang_opts);
}
}
// Sort type segments as they're written in the file. This avoids needing to
// understand TypeLoc traversal ordering.
std::sort(segments.begin(), segments.end(),
[](clang::SourceRange a, clang::SourceRange b) {
return a.getBegin() < b.getBegin();
});
std::string type_str;
for (const auto& segment : segments) {
type_str += clang::Lexer::getSourceText(
clang::CharSourceRange::getTokenRange(segment), sm, lang_opts);
}
return type_str;
}
void VarDecl::run(const cam::MatchFinder::MatchResult& result) {
const auto* decl = result.Nodes.getNodeAs<clang::VarDecl>(Label);
if (!decl) {
llvm::report_fatal_error(std::string("getNodeAs failed for ") + Label);
}
auto& sm = *(result.SourceManager);
auto lang_opts = result.Context->getLangOpts();
std::string after;
// Start the replacement with "var" unless it's a parameter.
if (result.Nodes.getNodeAs<clang::ParmVarDecl>(Label) == nullptr) {
after = "var ";
}
// Finish the "type: name" replacement.
after += decl->getNameAsString() + ": " +
clang::QualType::getAsString(decl->getType().split(), lang_opts);
if (decl->getTypeSourceInfo() == nullptr) {
// TODO: Need to understand what's happening in this case. Not sure if we
// need to address it.
return;
}
auto& sm = *(result.SourceManager);
auto lang_opts = result.Context->getLangOpts();
std::string after;
if (decl->getType().isConstQualified()) {
after = "let ";
} else if (result.Nodes.getNodeAs<clang::ParmVarDecl>(Label) == nullptr) {
// Start the replacement with "var" unless it's a parameter.
after = "var ";
}
// Add "identifier: type" to the replacement.
after += decl->getNameAsString() + ": " + GetTypeStr(decl, sm, lang_opts);
// This decides the range to replace. Normally the entire decl is replaced,
// but for code like `int i, j` we need to detect the comma between the
// declared names. That case currently results in `var i: int, var j: int`.
// If there's a comma, this range will be non-empty.
auto type_loc = decl->getTypeSourceInfo()->getTypeLoc();
auto after_type_loc =
clang::Lexer::getLocForEndOfToken(type_loc.getEndLoc(), 0, sm, lang_opts);
// If there's a comma, this range will be non-empty.
auto comma_source_text = clang::Lexer::getSourceText(
clang::CharSourceRange::getCharRange(after_type_loc, decl->getLocation()),
sm, lang_opts);