Will Hawkins
63 lines
2.2 KiB
Swift
63 lines
2.2 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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public protocol EvaluatableExpression {
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/// Evaluate an expression for a given execution
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/// - Parameters
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/// - execution: The execution context in which to evaluate the expression
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/// - Returns: The value of expression
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func evaluate(execution: ProgramExecution) -> Result<P4Value>
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func type() -> any P4Type
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}
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public protocol EvaluatableStatement {
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/// Evaluate a statement for a given execution
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/// - Parameters
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/// - execution: The execution context in which to evaluate the parser statement
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/// - Returns: A tuple of
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/// 1. Whether this statement affects control flow.
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/// 2. An updated execution after evaluating the parser statement
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func evaluate(execution: ProgramExecution) -> (ControlFlow, ProgramExecution)
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}
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public protocol P4Type: CustomStringConvertible {
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func eq(rhs: any P4Type) -> Bool
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func def() -> P4Value
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}
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public protocol P4Value: EvaluatableExpression, CustomStringConvertible {
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func type() -> any P4Type
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func eq(rhs: P4Value) -> Bool
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func lt(rhs: P4Value) -> Bool
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func lte(rhs: P4Value) -> Bool
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func gt(rhs: P4Value) -> Bool
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func gte(rhs: P4Value) -> Bool
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}
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extension P4Value {
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public func evaluate(execution: ProgramExecution) -> Result<P4Value> {
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return Result.Ok(self)
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}
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}
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public protocol EvaluatableLValueExpression: EvaluatableExpression {
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func set(
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to: P4Value, inScopes scopes: VarValueScopes, duringExecution execution: ProgramExecution
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) -> Result<(VarValueScopes, P4Value)>
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func check(to: EvaluatableExpression, inScopes scopes: VarTypeScopes) -> Result<()>
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}
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