Will Hawkins
117 lines
3.0 KiB
Swift
117 lines
3.0 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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open class ProgramExecution: CustomStringConvertible {
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public var scopes: VarValueScopes = VarValueScopes()
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let initialValues: VarValueScopes?
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var error: Error?
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var debug: DebugLevel = DebugLevel.Error
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init(copy: ProgramExecution) {
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self.scopes = copy.scopes
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self.initialValues = copy.initialValues
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self.error = copy.error
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self.debug = copy.debug
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}
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public init() {
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initialValues = .none
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}
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public init(withGlobalValues values: VarValueScopes) {
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initialValues = values
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}
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open var description: String {
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return "Runtime:\nScopes: \(scopes)"
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}
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public func hasError() -> Bool {
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return self.error != nil
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}
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public func getError() -> Error? {
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return self.error
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}
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public func setError(error: Error) -> ProgramExecution {
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let npe = ProgramExecution(copy: self)
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npe.error = error
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return npe
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}
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public func getDebugLevel() -> DebugLevel {
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return self.debug
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}
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public func setDebugLevel(_ dl: DebugLevel) -> ProgramExecution {
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let pe = ProgramExecution(copy: self)
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pe.debug = dl
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return pe
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}
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open func isDone() -> Bool {
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return false
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}
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open func setDone() -> ProgramExecution {
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// For a bare ProgramExecution, setDone is a noop.
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return self
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}
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public func enter_scope() -> ProgramExecution {
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let new_pe = ProgramExecution(copy: self)
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new_pe.scopes = new_pe.scopes.enter()
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return new_pe
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}
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public func exit_scope() -> ProgramExecution {
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let new_pe = ProgramExecution(copy: self)
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new_pe.scopes = new_pe.scopes.exit()
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return new_pe
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}
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public func declare(identifier: Identifier, withValue value: P4Value) -> ProgramExecution {
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let new_pe = ProgramExecution(copy: self)
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let new_scopes = new_pe.scopes.declare(identifier: identifier, withValue: value)
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new_pe.scopes = new_scopes
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return new_pe
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}
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public func initial_values() -> VarValueScopes? {
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return self.initialValues
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}
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}
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/// A scope that resolves variable identifiers to their values.
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public typealias VarValueScope = Scope<P4Value>
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/// Scopes that resolves variable identifiers to their values.
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public typealias VarValueScopes = Scopes<P4Value>
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/// Indicate the control flow result of a particular statement.
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public enum ControlFlow {
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case Next
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case Continue
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case Break
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case Return(P4Value?)
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case Error
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}
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