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Jon Ross-Perkins
53af8f04b2
With the toolchain splitting namespaces, ostream.h's `operator<<` templates aren't reliably found with name lookup, likely due to the loss of associated namespaces (zygoloid commented on this at https://github.com/carbon-language/carbon-lang/pull/3161#discussion_r1307941999). This is especially a barrier to moving the lex files into `Carbon::Lex`; versus other parts of the toolchain, they contain more printable types which are used cross-namespace, including `Carbon::Testing`. As a consequence, I'm looking at migrating ostream.h to a more reliable approach that doesn't rely as much on everything being in the `Carbon` namespace.
74 lines
2.4 KiB
C++
74 lines
2.4 KiB
C++
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#ifndef CARBON_EXPLORER_BASE_SOURCE_LOCATION_H_
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#define CARBON_EXPLORER_BASE_SOURCE_LOCATION_H_
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#include <string>
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#include <string_view>
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#include "common/ostream.h"
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#include "explorer/base/nonnull.h"
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namespace Carbon {
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// Describes the kind of file that the source location is within.
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enum class FileKind { Main, Prelude, Import, Unknown, Last = Unknown };
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class SourceLocation : public Printable<SourceLocation> {
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public:
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// Produce a source location that is known to not be used, because it is fed
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// into an operation that creates no AST nodes and whose diagnostics are
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// discarded.
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static auto DiagnosticsIgnored() -> SourceLocation {
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return SourceLocation("", 0, FileKind::Unknown);
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}
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// The filename should be eternal or arena-allocated to eliminate copies.
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explicit constexpr SourceLocation(std::string_view filename, int line_num,
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FileKind file_kind)
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: filename_(filename), line_num_(line_num), file_kind_(file_kind) {}
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explicit SourceLocation(Nonnull<const std::string*> filename, int line_num,
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FileKind file_kind)
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: filename_(*filename), line_num_(line_num), file_kind_(file_kind) {}
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SourceLocation(const SourceLocation&) = default;
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SourceLocation(SourceLocation&&) = default;
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auto operator=(const SourceLocation&) -> SourceLocation& = default;
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auto operator=(SourceLocation&&) -> SourceLocation& = default;
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auto operator==(SourceLocation other) const -> bool {
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return filename_ == other.filename_ && line_num_ == other.line_num_ &&
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file_kind_ == other.file_kind_;
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}
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auto filename() const -> std::string_view { return filename_; }
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auto file_kind() const -> FileKind { return file_kind_; }
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void Print(llvm::raw_ostream& out) const {
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if (file_kind_ == FileKind::Prelude) {
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out << llvm::StringRef(filename_).rsplit("/").second << ":" << line_num_;
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} else {
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out << filename_ << ":" << line_num_;
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}
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}
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auto ToString() const -> std::string {
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std::string result;
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llvm::raw_string_ostream out(result);
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Print(out);
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return result;
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}
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private:
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std::string_view filename_;
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int line_num_;
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FileKind file_kind_;
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};
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} // namespace Carbon
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#endif // CARBON_EXPLORER_BASE_SOURCE_LOCATION_H_
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