Will Hawkins
66 lines
2.2 KiB
Swift
66 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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import Common
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import Lang
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extension ParserState: EvaluatableParserTransition {
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public func evaluate(execution: ProgramExecution) -> (ParserState, ProgramExecution) {
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var currentExecution = execution
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// First, evaluate the local elements.
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for local_element in local_elements {
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currentExecution = local_element.evaluate(execution: currentExecution)
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}
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// Then, evaluate the statements.
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for statement in statements {
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currentExecution = statement.evaluate(execution: currentExecution)
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}
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if direct_transition() {
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return (next_state!, currentExecution)
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}
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if let transition_expression = self.transition,
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let transition_select_expression = transition_expression.transition_expression
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{
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return transition_select_expression.evaluate(execution: currentExecution)
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}
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return (reject, currentExecution)
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}
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}
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extension ParserTransitionSelectExpression: EvaluatableParserTransition {
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func evaluate(execution: Common.ProgramExecution) -> (Lang.ParserState, Common.ProgramExecution) {
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// First, evaluate the selector.
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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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return (kse.next_state!, execution)
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}
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}
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case .Error(let e): return (reject, execution.setError(error: e))
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}
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return (reject, execution)
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}
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}
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