mirror of
https://github.com/carbon-language/carbon-lang.git
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Geoff RomerandJon Meow
6ac3adfa53
`Pattern` is intended to pilot some changes I would like to apply to all our sum types: - The alternatives are expressed as derived classes rather than members of a `std::variant`. - The alternatives are classes in the [style guide sense](https://google.github.io/styleguide/cppguide.html#Structs_vs._Classes), meaning they can have invariants, but can't have public data members. - Creating an object is expressed using a constructor rather than a factory function. - Accessing an alternative is expressed as a cast (using LLVM's RTTI system) rather than `std::get` or a `Get` method. Co-authored-by: Jon Meow <46229924+jonmeow@users.noreply.github.com>
110 lines
2.7 KiB
C++
110 lines
2.7 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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#include "executable_semantics/interpreter/action.h"
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#include <iterator>
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#include <map>
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#include <optional>
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#include <utility>
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#include <vector>
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#include "executable_semantics/ast/expression.h"
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#include "executable_semantics/ast/function_definition.h"
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#include "executable_semantics/interpreter/stack.h"
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#include "llvm/ADT/StringExtras.h"
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namespace Carbon {
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auto Action::MakeLValAction(const Expression* e) -> Action* {
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auto* act = new Action();
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act->value = LValAction({.exp = e});
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return act;
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}
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auto Action::MakeExpressionAction(const Expression* e) -> Action* {
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auto* act = new Action();
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act->value = ExpressionAction({.exp = e});
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return act;
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}
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auto Action::MakePatternAction(const Pattern* p) -> Action* {
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auto* act = new Action();
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act->value = PatternAction({.pattern = p});
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return act;
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}
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auto Action::MakeStatementAction(const Statement* s) -> Action* {
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auto* act = new Action();
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act->value = StatementAction({.stmt = s});
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return act;
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}
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auto Action::MakeValAction(const Value* v) -> Action* {
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auto* act = new Action();
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act->value = ValAction({.val = v});
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return act;
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}
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auto Action::GetLValAction() const -> const LValAction& {
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return std::get<LValAction>(value);
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}
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auto Action::GetExpressionAction() const -> const ExpressionAction& {
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return std::get<ExpressionAction>(value);
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}
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auto Action::GetPatternAction() const -> const PatternAction& {
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return std::get<PatternAction>(value);
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}
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auto Action::GetStatementAction() const -> const StatementAction& {
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return std::get<StatementAction>(value);
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}
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auto Action::GetValAction() const -> const ValAction& {
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return std::get<ValAction>(value);
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}
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void Action::Print(llvm::raw_ostream& out) const {
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switch (tag()) {
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case ActionKind::LValAction:
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out << *GetLValAction().exp;
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break;
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case ActionKind::ExpressionAction:
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out << *GetExpressionAction().exp;
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break;
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case ActionKind::PatternAction:
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out << *GetPatternAction().pattern;
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break;
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case ActionKind::StatementAction:
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GetStatementAction().stmt->PrintDepth(1, out);
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break;
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case ActionKind::ValAction:
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out << *GetValAction().val;
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break;
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}
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out << "<" << pos << ">";
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if (results.size() > 0) {
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out << "(";
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llvm::ListSeparator sep;
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for (auto& result : results) {
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out << sep;
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if (result) {
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out << *result;
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}
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}
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out << ")";
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}
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}
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void Action::PrintList(const Stack<Action*>& ls, llvm::raw_ostream& out) {
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llvm::ListSeparator sep(" :: ");
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for (const auto& action : ls) {
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out << sep << *action;
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}
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}
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} // namespace Carbon
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