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Allow Declaring Instances of Structs

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Signed-off-by: Will Hawkins <hawkinsw@obs.cr>
This commit is contained in:
Will Hawkins
2026-03-20 04:25:36 -04:00
parent f0d816b99f
commit aac007f1f2
7 changed files with 178 additions and 58 deletions
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Sources/P4Compiler/Parser.swift
+12 -11
View File
@@ -64,9 +64,6 @@ public struct Parser {
"variableDeclaration": VariableDeclarationStatement.self,
"conditionalStatement": ConditionalStatement.self, "blockStatement": BlockStatement.self,
]
// Iterate through statement parsers and give each one a chance.
guard let parser = statementParsers[statement.nodeType ?? ""] else {
return Result.Error(
ErrorOnNode(
@@ -151,7 +148,7 @@ public struct Parser {
return Result.Error(ErrorOnNode(node: node, withError: "Did not find expected statements"))
}
var parse_err: Error? = .none
var parse_errs: [Error] = Array()
var current_context = context
var parsed_s: [EvaluatableStatement] = Array()
@@ -163,12 +160,14 @@ public struct Parser {
current_context = updated_context
parsed_s.append(parsed_statement)
case .Error(let e):
parse_err = e
parse_errs.append(e)
}
}
if let parse_err = parse_err {
return Result.Error(parse_err)
if !parse_errs.isEmpty {
return Result.Error(Error(withMessage: parse_errs.map() { err in
return String(err.msg)
}.joined(separator: ";")))
}
return Result.Ok((parsed_s, current_context))
}
@@ -224,7 +223,7 @@ public struct Parser {
currentChildIdx += 2
currentChildIdxSafe += 2
var parse_err: Error? = .none
var parse_errs: [Error] = Array()
var current_context = context
var parsed_s: [EvaluatableStatement] = Array()
@@ -240,14 +239,16 @@ public struct Parser {
parsed_s = state_statements
current_context = updated_context
case .Error(let error):
parse_err = error
parse_errs.append(error)
}
currentChildIdx += 1
currentChildIdxSafe += 1
}
if let parse_err = parse_err {
return Result.Error(parse_err)
if !parse_errs.isEmpty {
return Result.Error(Error(withMessage: parse_errs.map() { err in
return String(err.msg)
}.joined(separator: ";")))
}
if node.childCount < currentChildIdxSafe {
Sources/P4Compiler/Protocols.swift
+1 -1
View File
@@ -33,5 +33,5 @@ public protocol CompilableValue {
}
public protocol CompilableType {
static func CompileType(type: String) -> Result<P4Type?>
static func CompileType(type: SwiftTreeSitter.Node, withContext: CompilerContext) -> Result<P4Type?>
}
Sources/P4Compiler/Statement.swift
+26 -25
View File
@@ -182,14 +182,6 @@ extension VariableDeclarationStatement: CompilableStatement {
}
let maybe_rvalue = node.childCount > 3 ? node.child(at: 3) : .none
guard let rvalue = maybe_rvalue,
rvalue.nodeType == "expression"
else {
return Result.Error(
ErrorOnNode(
node: node,
withError: "Did not find initial value expression for variable declaration statement"))
}
guard
case .Ok(let parsed_variablename) = Identifier.Compile(
@@ -199,39 +191,48 @@ extension VariableDeclarationStatement: CompilableStatement {
Error(withMessage: "Could not parse variable name"))
}
let maybe_parsed_rvalue = Expression.Compile(node: rvalue, withContext: context)
guard case .Ok(let declaration_p4_type) = Types.CompileType(type: typeref, withContext: context) else {
return Result.Error(
Error(withMessage: "Could not parse a P4 type from \(typeref.text!)"))
}
var initializer: EvaluatableExpression = declaration_p4_type.def()
// If there is an initializer, it must be an expression.
if let rvalue = maybe_rvalue {
guard rvalue.nodeType == "expression" else {
return Result.Error(
ErrorOnNode(
node: node,
withError: "initial value for declaration statement is not an expression"))
}
let maybe_parsed_rvalue = Expression.Compile(node: rvalue, withContext: context)
guard
case .Ok(let parsed_rvalue) = maybe_parsed_rvalue
else {
return .Error(maybe_parsed_rvalue.error()!)
}
guard case .Ok(let declaration_p4_type) = Types.CompileBasicType(type: typeref.text!) else {
return Result.Error(
Error(withMessage: "Could not parse a P4 type from \(typeref.text!)"))
}
if parsed_rvalue.type().eq(rhs: declaration_p4_type) {
return Result.Ok(
(
VariableDeclarationStatement(
identifier: parsed_variablename, withInitializer: parsed_rvalue),
// Context with updated names to include the newly declared name.
context.update(
newNames: context.names.declare(
identifier: parsed_variablename, withValue: declaration_p4_type))
))
initializer = parsed_rvalue
} else {
return Result.Error(
Error(
withMessage:
"Cannot initialize \(parsed_variablename) (with type \(declaration_p4_type)) from rvalue with type \(parsed_rvalue.type())"
))
}
}
return Result.Ok(
(
VariableDeclarationStatement(
identifier: parsed_variablename, withInitializer: initializer),
// Context with updated names to include the newly declared name.
context.update(
newNames: context.names.declare(
identifier: parsed_variablename, withValue: declaration_p4_type))
))
}
}
extension ExpressionStatement: CompilableStatement {
Sources/P4Compiler/Types.swift
+24 -9
View File
@@ -23,27 +23,42 @@ import TreeSitterExtensions
import TreeSitterP4
extension P4Boolean: CompilableType {
public static func CompileType(type: String) -> Common.Result<(any Common.P4Type)?> {
return type == "bool" ? .Ok(P4Boolean()) : .Ok(.none)
public static func CompileType(type: SwiftTreeSitter.Node, withContext: CompilerContext) -> Common.Result<(any Common.P4Type)?> {
return type.text == "bool" ? .Ok(P4Boolean()) : .Ok(.none)
}
}
extension P4Int: CompilableType {
public static func CompileType(type: String) -> Common.Result<(any Common.P4Type)?> {
return type == "int" ? .Ok(P4Int()) : .Ok(.none)
public static func CompileType(type: SwiftTreeSitter.Node, withContext: CompilerContext) -> Common.Result<(any Common.P4Type)?> {
return type.text == "int" ? .Ok(P4Int()) : .Ok(.none)
}
}
extension P4String: CompilableType {
public static func CompileType(type: String) -> Common.Result<(any Common.P4Type)?> {
return type == "string" ? .Ok(P4String()) : .Ok(.none)
public static func CompileType(type: SwiftTreeSitter.Node, withContext: CompilerContext) -> Common.Result<(any Common.P4Type)?> {
return type.text == "string" ? .Ok(P4String()) : .Ok(.none)
}
}
extension P4Struct: CompilableType {
public static func CompileType(type: SwiftTreeSitter.Node, withContext context: CompilerContext) -> Common.Result<(any Common.P4Type)?> {
let maybe_parsed_type_id = Identifier.Compile(node: type, withContext: context)
guard case .Ok(let parsed_type_id) = maybe_parsed_type_id else {
return .Error(maybe_parsed_type_id.error()!)
}
if case .Ok(let found_type) = context.types.lookup(identifier: parsed_type_id),
let found_struct_type = found_type as? P4Struct {
return .Ok(found_struct_type)
}
return .Ok(.none)
}
}
public struct Types {
static func CompileBasicType(type: String) -> Result<P4Type> {
let type_parsers: [CompilableType.Type] = [P4Boolean.self, P4Int.self, P4String.self]
static func CompileType(type: SwiftTreeSitter.Node, withContext context: CompilerContext) -> Result<P4Type> {
let type_parsers: [CompilableType.Type] = [P4Boolean.self, P4Int.self, P4String.self, P4Struct.self]
for type_parser in type_parsers {
switch type_parser.CompileType(type: type) {
switch type_parser.CompileType(type: type, withContext: context) {
case .Ok(.some(let type)): return .Ok(type)
case .Ok(.none): continue
case .Error(let e): return .Error(e)
Tests/p4rseTests/StructTests.swift
+59
View File
@@ -62,6 +62,65 @@ import TreeSitterP4
#expect(state_result == P4Lang.accept)
}
@Test func test_field_access_declared() async throws {
let simple_parser_declaration = """
parser main_parser() {
state start {
Testing ts;
ts.yesno = true;
bool where_to = ts.yesno;
transition select (where_to) {
true: accept;
false: reject;
};
}
};
"""
var test_types = TypeTypeScopes().enter()
let fields = P4StructFields([
P4StructFieldIdentifier(name: "yesno", withType: P4Boolean()),
P4StructFieldIdentifier(name: "count", withType: P4Int()),
])
let struct_type = P4Struct(withName: Identifier(name: "Testing"), andFields: fields)
test_types = test_types.declare(identifier: Identifier(name: "Testing"), withValue: struct_type)
let program = try #UseOkResult(
Program.Compile(simple_parser_declaration, withGlobalInstances: .none, withGlobalTypes: test_types))
let runtime = try #UseOkResult(P4Runtime.ParserRuntime.create(program: program))
let (state_result, _) = try! #UseOkResult(runtime.run())
#expect(state_result == P4Lang.accept)
}
@Test func test_field_access_declared2() async throws {
let simple_parser_declaration = """
parser main_parser() {
state start {
Testing ts;
ts.yesno = true;
ts.count = 5;
bool where_to = ts.yesno;
transition select (ts.count == 5) {
true: accept;
false: reject;
};
}
};
"""
var test_types = TypeTypeScopes().enter()
let fields = P4StructFields([
P4StructFieldIdentifier(name: "yesno", withType: P4Boolean()),
P4StructFieldIdentifier(name: "count", withType: P4Int()),
])
let struct_type = P4Struct(withName: Identifier(name: "Testing"), andFields: fields)
test_types = test_types.declare(identifier: Identifier(name: "Testing"), withValue: struct_type)
let program = try #UseOkResult(
Program.Compile(simple_parser_declaration, withGlobalInstances: .none, withGlobalTypes: test_types))
let runtime = try #UseOkResult(P4Runtime.ParserRuntime.create(program: program))
let (state_result, _) = try! #UseOkResult(runtime.run())
#expect(state_result == P4Lang.accept)
}
@Test func test_field_access_opp() async throws {
let simple_parser_declaration = """
parser main_parser() {
tree-sitter-p4/grammar.js
+4 -4
View File
@@ -34,7 +34,7 @@ export default grammar({
direction: $ => choice($.in, $.out, $.inout),
// Common - Types
typeRef: $ => $.baseType,
typeRef: $ => choice($.baseType, $.type_identifier),
baseType: $ => choice($.bool, $.error, $.string, $.int, $.bit /* omitting "templated" types" */),
constructorParameters: $ => seq('(', optional($.parameterList), ')'),
@@ -148,11 +148,11 @@ export default grammar({
varbit: $ => "varbit",
valueset: $ => "valueset",
void: $ => "void",
identifier: $ => /[a-z_]+/,
type_identifier: $ => /[a-z]+/,
identifier: $ => /[A-Za-z_]+/,
type_identifier: $ => /[A-Za-z_]+/,
string_literal: $ => /".*"/,
integer: $ => /[0-9]+/,
annotation_literal: $ => /@[a-z_]+/,
annotation_literal: $ => /@[A-Za-z_]+/,
double_equal: $=> '==',
open_bracket: $=> '[',
close_bracket: $=> ']',
tree-sitter-p4/test/corpus/declarations.txt
+44
View File
@@ -186,3 +186,47 @@ parser simple() {
)
)
=========================
Non Basic Type Declaration (No Initial Value)
=========================
parser simple() {
state start {
header_t header;
transition accept;
}
};
---
(p4program
(declaration
(parserDeclaration
(parserType
(parser)
(identifier)
)
(parserStates
(parserState
(state)
(identifier)
(parserStatements
(parserStatement
(variableDeclaration
(typeRef
(type_identifier)
)
(identifier)
)
)
)
(parserTransitionStatement
(transition)
(transitionSelectionExpression
(identifier)
)
)
)
)
)
)
)