Will Hawkins
89 lines
2.7 KiB
Swift
89 lines
2.7 KiB
Swift
// p4rse, Copyright 2026, Will Hawkins
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//
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// This file is part of p4rse.
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//
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// This file is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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import Common
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import P4Lang
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extension KeysetExpression: EvaluatableExpression {
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public func evaluate(execution: Common.ProgramExecution) -> Common.Result<any Common.P4Value> {
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return execution.scopes.lookup(identifier: next_state_identifier)
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}
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public func type() -> any Common.P4Type {
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// TODO
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return reject
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}
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}
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extension SelectExpression: EvaluatableExpression {
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public func evaluate(execution: Common.ProgramExecution) -> Common.Result<any Common.P4Value> {
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switch self.selector.evaluate(execution: execution) {
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case .Ok(let selector_value):
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for kse in self.keyset_expressions {
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if case .Ok(let kse_key) = kse.key.evaluate(execution: execution),
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kse_key.eq(rhs: selector_value)
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{
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let result = kse.evaluate(execution: execution)
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return result
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}
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}
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return .Error(Error(withMessage: "No key matched the selector"))
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case .Error(let e): return .Error(e)
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}
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}
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// TODO
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public func type() -> any Common.P4Type {
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return reject
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}
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}
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extension P4StringValue: EvaluatableExpression {
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public func evaluate(execution: Common.ProgramExecution) -> Common.Result<any Common.P4Value> {
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return .Ok(self)
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}
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}
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extension P4BooleanValue: EvaluatableExpression {
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public func evaluate(execution: Common.ProgramExecution) -> Common.Result<any Common.P4Value> {
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return .Ok(self)
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}
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}
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extension P4StructValue: EvaluatableExpression {
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public func evaluate(execution: Common.ProgramExecution) -> Common.Result<any Common.P4Value> {
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return .Ok(self)
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}
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}
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extension P4IntValue: EvaluatableExpression {
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public func evaluate(execution: Common.ProgramExecution) -> Common.Result<any Common.P4Value> {
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return .Ok(self)
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}
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}
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// Variables are evaluatable because they can be looked up by identifiers.
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extension TypedIdentifier: EvaluatableExpression {
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public func type() -> any Common.P4Type {
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return self.parsed_type
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}
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public func evaluate(execution: Common.ProgramExecution) -> Result<P4Value> {
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return execution.scopes.lookup(identifier: self)
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}
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}
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