Will Hawkins
87 lines
3.2 KiB
Swift
87 lines
3.2 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 P4Lang
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import P4Runtime
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import SwiftTreeSitter
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import TreeSitterExtensions
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import TreeSitterP4
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extension VariableDeclarationStatement: ParseableStatement {
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public static func Parse(
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node: Node, inTree tree: MutableTree, withScopes scopes: LexicalScopes
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) -> Result<(EvaluatableStatement?, LexicalScopes)> {
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guard
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let variable_declaration_query = try? SwiftTreeSitter.Query(
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language: p4lang,
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data: String(
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"(variableDeclaration (annotations)? (typeRef) @type-name variable_name: (identifier) @identifier ((assignment) (expression) @value)?)"
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).data(using: String.Encoding.utf8)!)
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else {
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return Result.Ok((.none, scopes))
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}
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let qr = variable_declaration_query.execute(node: node, in: tree)
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guard let variable_declaration = qr.next() else {
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return .Ok((.none, scopes))
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}
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let type_name_capture = variable_declaration.captures(named: "type-name")
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let variable_name_capture = variable_declaration.captures(named: "identifier")
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let value_capture = variable_declaration.captures(named: "value")
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// There must be a type name and a variable name
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guard !type_name_capture.isEmpty,
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!variable_name_capture.isEmpty,
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!value_capture.isEmpty,
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let variable_name = variable_name_capture[0].node.text,
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let type_name = type_name_capture[0].node.text
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else {
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return Result.Error(
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Error(withMessage: "Could not parse a parser variable declaration statement"))
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}
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guard case .Ok(let declaration_p4_type) = Types.ParseBasicType(type: type_name) else {
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return Result.Error(
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Error(withMessage: "Could not parse a P4 type from \(type_name)"))
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}
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let rvalue_raw = value_capture[0].node
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let maybe_parsed_rvalue = Expression.Parse(node: rvalue_raw, inTree: tree, withScopes: scopes)
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guard case Result.Ok(let rvalue) = maybe_parsed_rvalue else {
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return Result.Error(maybe_parsed_rvalue.error()!)
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}
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if rvalue.type().eq(rhs: declaration_p4_type) {
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return Result.Ok(
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(
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VariableDeclarationStatement(identifier: Identifier(name: variable_name), withInitializer: rvalue),
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scopes.declare(identifier: Identifier(name: variable_name), withValue: declaration_p4_type)
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))
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} else {
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return Result.Error(
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Error(
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withMessage:
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"Cannot initialize \(variable_name) (with type \(declaration_p4_type)) from rvalue with type \(rvalue.type())"
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))
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}
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}
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}
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