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1d961ba22d
Although I don't plan to bring over new assertions wholesale into the current qualification branch, it's entirely possible that various minor changes in main will use the new assertions; having this basic support in the release branch will simplify that. (This is why I'm adding the includes as a separate pass from rewriting the individual assertions)
85 lines
2.6 KiB
C++
85 lines
2.6 KiB
C++
//===--- EditorPlaceholder.cpp - Handling for editor placeholders ---------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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///
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/// \file
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/// Provides info about editor placeholders, <#such as this#>.
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///
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//===----------------------------------------------------------------------===//
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#include "swift/Basic/Assertions.h"
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#include "swift/Basic/EditorPlaceholder.h"
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#include <optional>
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using namespace swift;
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// Placeholder text must start with '<#' and end with
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// '#>'.
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//
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// Placeholder kinds:
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//
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// Typed:
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// 'T##' display-string '##' type-string ('##' type-for-expansion-string)?
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// 'T##' display-and-type-string
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//
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// Basic:
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// display-string
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//
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// NOTE: It is required that '##' is not a valid substring of display-string
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// or type-string. If this ends up not the case for some reason, we can consider
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// adding escaping for '##'.
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std::optional<EditorPlaceholderData>
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swift::parseEditorPlaceholder(llvm::StringRef PlaceholderText) {
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if (!PlaceholderText.starts_with("<#") ||
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!PlaceholderText.ends_with("#>"))
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return std::nullopt;
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PlaceholderText = PlaceholderText.drop_front(2).drop_back(2);
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EditorPlaceholderData PHDataBasic;
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PHDataBasic.Kind = EditorPlaceholderKind::Basic;
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PHDataBasic.Display = PlaceholderText;
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if (!PlaceholderText.starts_with("T##")) {
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// Basic.
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return PHDataBasic;
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}
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// Typed.
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EditorPlaceholderData PHDataTyped;
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PHDataTyped.Kind = EditorPlaceholderKind::Typed;
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assert(PlaceholderText.starts_with("T##"));
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PlaceholderText = PlaceholderText.drop_front(3);
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size_t Pos = PlaceholderText.find("##");
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if (Pos == llvm::StringRef::npos) {
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PHDataTyped.Display = PHDataTyped.Type = PHDataTyped.TypeForExpansion =
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PlaceholderText;
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return PHDataTyped;
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}
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PHDataTyped.Display = PlaceholderText.substr(0, Pos);
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PlaceholderText = PlaceholderText.substr(Pos+2);
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Pos = PlaceholderText.find("##");
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if (Pos == llvm::StringRef::npos) {
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PHDataTyped.Type = PHDataTyped.TypeForExpansion = PlaceholderText;
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} else {
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PHDataTyped.Type = PlaceholderText.substr(0, Pos);
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PHDataTyped.TypeForExpansion = PlaceholderText.substr(Pos+2);
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}
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return PHDataTyped;
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}
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bool swift::isEditorPlaceholder(llvm::StringRef IdentifierText) {
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return IdentifierText.starts_with("<#");
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}
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