Will Hawkins
294f76acd4
There were significant overlaps in the names of data structures between the compiler and the language that made it necessary to litter the code with P4Lang.xxxx. This refactor removes that requirement in most places (Parser is ambiguous wherever TreeSitter is used -- cannot avoid that!) Signed-off-by: Will Hawkins <hawkinsw@obs.cr>
93 lines
2.8 KiB
Swift
93 lines
2.8 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 Runtime<U, T: LibraryCallable<U>>: CustomStringConvertible {
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public var callable: T
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let initialValues: VarValueScopes?
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init(callable: T) {
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self.callable = callable
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self.initialValues = .none
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}
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init(callable: T, withGlobalValues initial: VarValueScopes?) {
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self.callable = callable
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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(
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program: Program
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) -> Result<Runtime<InstantiatedParserState, ParserValue>> {
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return Runtime.create(program: program, withGlobalValues: .none)
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}
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public static func create(
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program: Program, withGlobalValues initial: VarValueScopes?
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) -> Result<Runtime<InstantiatedParserState, ParserValue>> {
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return switch program.starting_parser() {
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case .Ok(let parser):
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.Ok(
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P4Runtime.Runtime<InstantiatedParserState, ParserValue>(
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callable: parser.instantiate(Identifier(name: "starting_parser")),
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withGlobalValues: initial))
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case .Error(let error): .Error(error)
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}
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}
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public static func create(
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control: Control, withGlobalValues initial: VarValueScopes?
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) -> Result<Runtime<P4TableHitMissValue, Control>> {
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return .Ok(
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P4Runtime.Runtime<P4TableHitMissValue, Control>(callable: control, withGlobalValues: initial))
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}
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/// Run a P4 parser with no arguments
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public func run() -> Result<(U, 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(
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withArguments arguments: ArgumentList, inExecution pe: ProgramExecution = ProgramExecution()
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) -> Result<(U, ProgramExecution)> {
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let npe =
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if let globals = initialValues {
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pe.setGlobalValues(globals)
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} else {
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pe
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}
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let (end_state, execution) = callable.call(execution: npe, 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: \(callable)"
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}
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}
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