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d53a88d920
The tool is currently hard-coded to find functions in the SwiftUI library that take parameters of type `(...) -> T` where `T: View` but where the parameter isn't annotated with `@ViewBuilder`. The long-term vision here, of course, is that this reads and interprets a script file, but that's quite a bit more work (especially to generate a million bindings to the AST). In the meantime, I think having a functional harness that people familiar with the C++ API can easily hack on to make their own tools is still pretty useful. The harness does try to open a script file and lex the first token of it, because that's exactly as far as I got before deciding to hard-code the query I wanted. Since this input is otherwise ignored, you can just point the tool at any old `.swift` file (or just an empty file) and it'll be fine.
119 lines
3.5 KiB
C++
119 lines
3.5 KiB
C++
//===--- ASTScriptParser.cpp ----------------------------------------------===//
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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 - 2019 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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/// AST script parsing.
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///
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//===----------------------------------------------------------------------===//
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#include "swift/Basic/QuotedString.h"
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#include "swift/Frontend/Frontend.h"
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#include "swift/Parse/Lexer.h"
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#include "swift/Parse/Token.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "ASTScript.h"
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#include "ASTScriptConfiguration.h"
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using namespace swift;
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using namespace scripting;
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namespace {
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class ASTScriptParser {
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ASTScriptConfiguration &Config;
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ASTContext &Context;
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DiagnosticEngine &Diags;
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std::unique_ptr<llvm::MemoryBuffer> Buffer;
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Optional<Lexer> TheLexer;
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Token Tok;
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public:
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ASTScriptParser(ASTScriptConfiguration &config)
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: Config(config), Context(config.Compiler.getASTContext()),
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Diags(config.Compiler.getDiags()) {
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auto &compiler = config.Compiler;
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// Open the file and give it to the source manager.
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auto bufferOrErr = llvm::MemoryBuffer::getFile(config.ScriptFile);
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if (!bufferOrErr) {
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llvm::errs() << "error opening file " << QuotedString(config.ScriptFile)
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<< ": " << bufferOrErr.getError().message() << "\n";
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return;
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}
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auto &sourceManager = compiler.getSourceMgr();
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auto bufferID = sourceManager.addNewSourceBuffer(std::move(*bufferOrErr));
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// Build and prime the lexer.
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TheLexer.emplace(Context.LangOpts, sourceManager, bufferID,
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&Diags, LexerMode::Swift);
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TheLexer->lex(Tok);
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}
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std::unique_ptr<ASTScript> parseFile() {
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if (!TheLexer) return nullptr;
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return parseTopLevel();
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}
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private:
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/***************************************************************************/
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/*** Parsing primitives ****************************************************/
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/***************************************************************************/
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void consume(tok kind) {
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assert(Tok.is(kind));
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TheLexer->lex(Tok);
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}
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bool consumeIf(tok kind) {
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if (Tok.isNot(kind)) return false;
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consume(kind);
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return true;
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}
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bool consumeIfExactly(StringRef literal) {
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if (Tok.isNot(tok::identifier) || Tok.getText() != literal)
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return false;
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consume(tok::identifier);
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return true;
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}
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bool consumeIfIdentifier(StringRef &ident) {
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if (Tok.isNot(tok::identifier)) return false;
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ident = Tok.getText();
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consume(tok::identifier);
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return true;
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}
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Optional<StringRef> consumeIfIdentifier() {
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StringRef ident;
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return consumeIfIdentifier(ident) ? Optional<StringRef>(ident) : None;
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}
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/***************************************************************************/
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/*** ASTScript parsing *****************************************************/
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/***************************************************************************/
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std::unique_ptr<ASTScript> parseTopLevel();
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};
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} // end anonymous namespace
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/// ast-script ::= ???
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std::unique_ptr<ASTScript> ASTScriptParser::parseTopLevel() {
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return std::unique_ptr<ASTScript>(new ASTScript(Config));
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}
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std::unique_ptr<ASTScript> ASTScript::parse(ASTScriptConfiguration &config) {
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return ASTScriptParser(config).parseFile();
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}
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