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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2023 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
import SwiftDiagnostics
import SwiftOperators
import SwiftSyntax
/// Describes the state of a particular region guarded by `#if` or similar.
public enum IfConfigRegionState {
/// The region is not part of the compiled program and is not even parsed,
/// and therefore many contain syntax that is invalid.
case unparsed
/// The region is parsed but is not part of the compiled program.
case inactive
/// The region is active and is part of the compiled program.
case active
/// Evaluate the given `#if` condition using the given build configuration
/// to determine its state, whether syntax errors in inactive conditions are
/// permitted, and to identify any problems encountered along the way.
public static func evaluating(
_ condition: some ExprSyntaxProtocol,
in configuration: some BuildConfiguration
) -> (state: IfConfigRegionState, syntaxErrorsAllowed: Bool, diagnostics: [Diagnostic]) {
// Apply operator folding for !/&&/||.
let (foldedCondition, foldingDiagnostics) = IfConfigClauseSyntax.foldOperators(condition)
let (active, syntaxErrorsAllowed, evalDiagnostics) = evaluateIfConfig(
condition: foldedCondition,
configuration: configuration
)
let diagnostics = foldingDiagnostics + evalDiagnostics
switch (active, syntaxErrorsAllowed) {
case (true, _): return (.active, syntaxErrorsAllowed, diagnostics)
case (false, false): return (.inactive, syntaxErrorsAllowed, diagnostics)
case (false, true): return (.unparsed, syntaxErrorsAllowed, diagnostics)
}
}
}
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