Will Hawkins
79 lines
2.4 KiB
Swift
79 lines
2.4 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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/// The runtime for a parser
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public struct ParserRuntime: CustomStringConvertible {
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public var parser: Parser
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let initialValues: VarValueScopes?
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init(parser: Parser) {
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self.parser = parser
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self.initialValues = .none
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}
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init(parser: Parser, withInitialValues initial: VarValueScopes?) {
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self.parser = parser
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self.initialValues = initial
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}
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/// Create a parser runtime from a P4 program
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public static func create(program: P4Lang.Program) -> Result<ParserRuntime> {
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return ParserRuntime.create(program: program, withInitialValues: .none)
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}
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public static func create(
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program: P4Lang.Program, withInitialValues initial: VarValueScopes?
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) -> Result<ParserRuntime> {
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return switch program.starting_parser() {
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case .Ok(let parser):
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.Ok(P4Runtime.ParserRuntime(parser: parser, withInitialValues: initial))
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case .Error(let error): .Error(error)
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}
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}
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/// Run a P4 parser with no arguments
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public func run() -> Result<(ParserState, ProgramExecution)> {
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return self.run(withArguments: ArgumentList([]))
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}
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/// Run the P4 parser on a given packet
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public func run(withArguments arguments: ArgumentList) -> Result<(ParserState, ProgramExecution)>
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{
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let pe =
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if let initial = initialValues {
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ProgramExecution(withGlobalValues: initial)
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} else {
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ProgramExecution()
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}
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let (end_state, execution) = parser.call(execution: pe, arguments: arguments)
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if let error = execution.getError() {
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return .Error(error)
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}
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return .Ok((end_state, execution))
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}
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public var description: String {
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return "Runtime:\nExecution: \(parser)"
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}
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}
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