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19caca7890
Since all parsing contexts need a reference to the current token of the parser, we should pass the token reference to the root context. Therefore, the derived sub-contexts can just copy it while being spawned.
129 lines
4.0 KiB
C++
129 lines
4.0 KiB
C++
//===----------- SyntaxParsingContext.h -==============----------*- C++ -*-===//
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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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#ifndef SWIFT_SYNTAX_PARSING_CONTEXT_H
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#define SWIFT_SYNTAX_PARSING_CONTEXT_H
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#include "swift/Syntax/RawTokenSyntax.h"
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#include "swift/Syntax/TokenSyntax.h"
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#include "swift/Syntax/References.h"
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#include "swift/Syntax/RawSyntax.h"
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#include "swift/Syntax/Syntax.h"
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#include "swift/Syntax/TokenKinds.h"
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#include "swift/Syntax/Trivia.h"
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namespace swift {
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class SourceFile;
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class Token;
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namespace syntax {
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/// The handler for parser to generate libSyntax entities.
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struct RawSyntaxInfo {
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/// Start location of this syntax node.
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SourceLoc StartLoc;
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/// The number of tokens belong to the syntax node.
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unsigned TokCount;
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/// The raw node.
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RC<RawSyntax> RawNode;
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RawSyntaxInfo(SourceLoc StartLoc, RC<RawSyntax> RawNode):
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RawSyntaxInfo(StartLoc, 1, RawNode) {}
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RawSyntaxInfo(SourceLoc StartLoc, unsigned TokCount, RC<RawSyntax> RawNode);
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template <typename SyntaxNode>
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SyntaxNode makeSyntax() const { return make<SyntaxNode>(RawNode); }
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template <typename RawSyntaxNode>
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RC<RawSyntaxNode> getRaw() const {
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return RC<RawSyntaxNode>(cast<RawSyntaxNode>(RawNode));
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}
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};
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enum class SyntaxParsingContextKind: uint8_t {
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Root,
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Child,
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};
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/// The base class of different kinds of Syntax context that Parser should use to
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/// create syntax nodes.
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class SyntaxParsingContext {
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protected:
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SyntaxParsingContext(SourceFile &SF, unsigned BufferID, Token &Tok);
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SyntaxParsingContext(SyntaxParsingContext &Another);
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public:
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struct ContextInfo;
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ContextInfo &ContextData;
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const Token &Tok;
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// Add a token syntax at the given source location to the context; this
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// token node can be used to build more complex syntax nodes in later call
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// back.
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virtual void addTokenSyntax(SourceLoc Loc) = 0;
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// Get the context kind.
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virtual SyntaxParsingContextKind getKind() = 0;
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// Create a syntax node of the given kind.
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virtual void makeNode(SyntaxKind Kind) = 0;
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virtual ~SyntaxParsingContext();
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// Disable the building of syntax tree in the current context.
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void disable();
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};
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// The start point of syntax tree parsing. This context is the root
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// of all other entity-specific contexts. This is the context Parser
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// has when the parser instance is firstly created.
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class SyntaxParsingContextRoot: public SyntaxParsingContext {
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SourceFile &File;
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public:
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SyntaxParsingContextRoot(SourceFile &File, unsigned BufferID, Token &Tok):
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SyntaxParsingContext(File, BufferID, Tok), File(File) {}
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~SyntaxParsingContextRoot();
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void addTokenSyntax(SourceLoc Loc) override {};
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void makeNode(SyntaxKind Kind) override {};
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SyntaxParsingContextKind getKind() override {
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return SyntaxParsingContextKind::Root;
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};
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};
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enum class SyntaxContextKind: uint8_t{
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Expr,
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Decl,
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};
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// The base class for contexts that are created from a parent context.
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// The stack instance will set the context holder when the context
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// is firstly created and reset the context holder to the parent when
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// it's destructed.
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class SyntaxParsingContextChild: public SyntaxParsingContext {
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SyntaxParsingContext *Parent;
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SyntaxParsingContext *&ContextHolder;
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const SyntaxContextKind Kind;
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public:
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SyntaxParsingContextChild(SyntaxParsingContext *&ContextHolder,
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SyntaxContextKind Kind);
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~SyntaxParsingContextChild();
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void makeNode(SyntaxKind Kind) override;
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void addTokenSyntax(SourceLoc Loc) override;
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SyntaxParsingContext* getParent() { return Parent; }
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SyntaxParsingContextRoot &getRoot();
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SyntaxParsingContextKind getKind() override {
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return SyntaxParsingContextKind::Child;
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};
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};
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}
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}
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#endif // SWIFT_SYNTAX_PARSING_CONTEXT_H
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