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Merge pull request #2073 from ewanmellor/swift-RecognitionException-remove-generic 

Tidy up the exception handling around RecognitionException.
This commit is contained in:
Terence Parr 2017-10-27 08:26:47 -07:00 committed by GitHub
parent 82854da434 fbe8c0d2a6
commit 20baa32b5a
12 changed files with 59 additions and 75 deletions
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4
runtime/Swift/Sources/Antlr4/ANTLRErrorStrategy.swift
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@ -63,7 +63,7 @@ public protocol ANTLRErrorStrategy {
/// - throws: _RecognitionException_ if the error strategy could not recover from
/// the recognition exception
///
func recover(_ recognizer: Parser, _ e: AnyObject) throws
func recover(_ recognizer: Parser, _ e: RecognitionException) throws
///
/// This method provides the error handler with an opportunity to handle
@ -115,5 +115,5 @@ public protocol ANTLRErrorStrategy {
/// - parameter recognizer: the parser instance
/// - parameter e: the recognition exception to report
///
func reportError(_ recognizer: Parser, _ e: AnyObject)
func reportError(_ recognizer: Parser, _ e: RecognitionException)
}

4
runtime/Swift/Sources/Antlr4/BailErrorStrategy.swift
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@ -40,7 +40,7 @@ public class BailErrorStrategy: DefaultErrorStrategy {
/// rule function catches. Use _Exception#getCause()_ to get the
/// original _org.antlr.v4.runtime.RecognitionException_.
///
override public func recover(_ recognizer: Parser, _ e: AnyObject) throws {
override public func recover(_ recognizer: Parser, _ e: RecognitionException) throws {
var context = recognizer.getContext()
while let contextWrap = context {
contextWrap.exception = e
@ -56,7 +56,7 @@ public class BailErrorStrategy: DefaultErrorStrategy {
///
override
public func recoverInline(_ recognizer: Parser) throws -> Token {
let e = try InputMismatchException(recognizer)
let e = InputMismatchException(recognizer)
var context = recognizer.getContext()
while let contextWrap = context {
contextWrap.exception = e

14
runtime/Swift/Sources/Antlr4/DefaultErrorStrategy.swift
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@ -90,7 +90,7 @@ public class DefaultErrorStrategy: ANTLRErrorStrategy {
/// the exception
///
public func reportError(_ recognizer: Parser,
_ e: AnyObject) {
_ e: RecognitionException) {
// if we've already reported an error and have not matched a token
// yet successfully, don't report any errors.
if inErrorRecoveryMode(recognizer) {
@ -109,8 +109,7 @@ public class DefaultErrorStrategy: ANTLRErrorStrategy {
}
else {
errPrint("unknown recognition error type: " + String(describing: type(of: e)))
let re = (e as! RecognitionException<ParserATNSimulator>)
recognizer.notifyErrorListeners(re.getOffendingToken(), re.message ?? "", e)
recognizer.notifyErrorListeners(e.getOffendingToken(), e.message ?? "", e)
}
}
@ -119,7 +118,7 @@ public class DefaultErrorStrategy: ANTLRErrorStrategy {
/// until we find one in the resynchronization set--loosely the set of tokens
/// that can follow the current rule.
///
public func recover(_ recognizer: Parser, _ e: AnyObject) throws {
public func recover(_ recognizer: Parser, _ e: RecognitionException) throws {
// print("recover in "+recognizer.getRuleInvocationStack()+
// " index="+getTokenStream(recognizer).index()+
// ", lastErrorIndex="+
@ -219,7 +218,7 @@ public class DefaultErrorStrategy: ANTLRErrorStrategy {
if try singleTokenDeletion(recognizer) != nil {
return
}
throw try ANTLRException.recognition(e: InputMismatchException(recognizer))
throw ANTLRException.recognition(e: InputMismatchException(recognizer))
case ATNState.PLUS_LOOP_BACK: fallthrough
case ATNState.STAR_LOOP_BACK:
@ -418,11 +417,8 @@ public class DefaultErrorStrategy: ANTLRErrorStrategy {
if try singleTokenInsertion(recognizer) {
return try getMissingSymbol(recognizer)
}
throw try ANTLRException.recognition(e: InputMismatchException(recognizer))
// throw try ANTLRException.InputMismatch(e: InputMismatchException(recognizer) )
//RuntimeException("InputMismatchException")
// even that didn't work; must throw the exception
//throwException() /* throw InputMismatchException(recognizer); */
throw ANTLRException.recognition(e: InputMismatchException(recognizer))
}
///

27
runtime/Swift/Sources/Antlr4/FailedPredicateException.swift
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@ -11,23 +11,12 @@
/// Disambiguating predicate evaluation occurs when we test a predicate during
/// prediction.
///
public class FailedPredicateException: RecognitionException<ParserATNSimulator> {
public class FailedPredicateException: RecognitionException {
private final var ruleIndex: Int
private final var predicateIndex: Int
private final var predicate: String?
public convenience init(_ recognizer: Parser) throws {
try self.init(recognizer, nil)
}
public convenience init(_ recognizer: Parser, _ predicate: String?)throws {
try self.init(recognizer, predicate, nil)
}
public init(_ recognizer: Parser,
_ predicate: String?,
_ message: String?) throws
{
public init(_ recognizer: Parser, _ predicate: String? = nil, _ message: String? = nil) {
let s = recognizer.getInterpreter().atn.states[recognizer.getState()]!
let trans = s.transition(0) as! AbstractPredicateTransition
@ -42,9 +31,10 @@ public class FailedPredicateException: RecognitionException<ParserATNSimulator>
self.predicate = predicate
super.init(FailedPredicateException.formatMessage(predicate!, message), recognizer , recognizer.getInputStream()!, recognizer._ctx)
try self.setOffendingToken(recognizer.getCurrentToken())
super.init(recognizer, recognizer.getInputStream()!, recognizer._ctx, FailedPredicateException.formatMessage(predicate, message))
if let token = try? recognizer.getCurrentToken() {
setOffendingToken(token)
}
}
public func getRuleIndex() -> Int {
@ -60,11 +50,12 @@ public class FailedPredicateException: RecognitionException<ParserATNSimulator>
}
private static func formatMessage(_ predicate: String, _ message: String?) -> String {
private static func formatMessage(_ predicate: String?, _ message: String?) -> String {
if message != nil {
return message!
}
return "failed predicate: {predicate}?" //String.format(Locale.getDefault(), "failed predicate: {%s}?", predicate);
let predstr = predicate ?? "<unknown>"
return "failed predicate: {\(predstr)}?"
}
}

8
runtime/Swift/Sources/Antlr4/InputMismatchException.swift
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@ -10,9 +10,11 @@
/// when the current input does not match the expected token.
///
public class InputMismatchException: RecognitionException<ParserATNSimulator> {
public init(_ recognizer: Parser) throws {
public class InputMismatchException: RecognitionException {
public init(_ recognizer: Parser) {
super.init(recognizer, recognizer.getInputStream()!, recognizer._ctx)
self.setOffendingToken(try recognizer.getCurrentToken())
if let token = try? recognizer.getCurrentToken() {
setOffendingToken(token)
}
}
}

2
runtime/Swift/Sources/Antlr4/LexerNoViableAltException.swift
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@ -5,7 +5,7 @@
///
public class LexerNoViableAltException: RecognitionException<LexerATNSimulator>, CustomStringConvertible {
public class LexerNoViableAltException: RecognitionException, CustomStringConvertible {
///
/// Matching attempted at what input index?
///

14
runtime/Swift/Sources/Antlr4/NoViableAltException.swift
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@ -10,7 +10,7 @@
/// in the various paths when the error. Reported by reportNoViableAlternative()
///
public class NoViableAltException: RecognitionException<ParserATNSimulator> {
public class NoViableAltException: RecognitionException {
/// Which configurations did we try at input.index() that couldn't match input.LT(1)?
private final var deadEndConfigs: ATNConfigSet?
@ -22,14 +22,15 @@ public class NoViableAltException: RecognitionException<ParserATNSimulator> {
///
private final var startToken: Token
public convenience init(_ recognizer: Parser?) throws {
public convenience init(_ recognizer: Parser) {
// LL(1) error
let token = try! recognizer.getCurrentToken()
self.init(recognizer,
recognizer!.getInputStream()!,
try recognizer!.getCurrentToken(),
try recognizer!.getCurrentToken(),
recognizer.getInputStream()!,
token,
token,
nil,
recognizer!._ctx)
recognizer._ctx)
}
public init(_ recognizer: Parser?,
@ -42,7 +43,6 @@ public class NoViableAltException: RecognitionException<ParserATNSimulator> {
self.deadEndConfigs = deadEndConfigs
self.startToken = startToken
// as? Recognizer<AnyObject, ATNSimulator>
super.init(recognizer, input, ctx)
self.setOffendingToken(offendingToken)
}

9
runtime/Swift/Sources/Antlr4/ParserInterpreter.swift
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@ -237,11 +237,8 @@ public class ParserInterpreter: Parser {
case Transition.PREDICATE:
let predicateTransition = transition as! PredicateTransition
if try !sempred(_ctx!, predicateTransition.ruleIndex, predicateTransition.predIndex) {
throw try ANTLRException.recognition(e: FailedPredicateException(self))
throw ANTLRException.recognition(e: FailedPredicateException(self))
}
break
case Transition.ACTION:
@ -251,9 +248,7 @@ public class ParserInterpreter: Parser {
case Transition.PRECEDENCE:
if !precpred(_ctx!, (transition as! PrecedencePredicateTransition).precedence) {
throw try ANTLRException.recognition(e: FailedPredicateException(self, "precpred(_ctx,\((transition as! PrecedencePredicateTransition).precedence))"))
throw ANTLRException.recognition(e: FailedPredicateException(self, "precpred(_ctx,\((transition as! PrecedencePredicateTransition).precedence))"))
}
break

26
runtime/Swift/Sources/Antlr4/RecognitionException.swift
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@ -11,12 +11,11 @@
/// and what kind of problem occurred.
///
public class RecognitionException<T:ATNSimulator> {
public class RecognitionException {
///
/// The _org.antlr.v4.runtime.Recognizer_ where this exception originated.
///
private final var recognizer: Recognizer<T>?
//Recognizer<AnyObject,ATNSimulator>? ;
private final var recognizer: RecognizerProtocol?
private final let ctx: RuleContext?
@ -32,25 +31,15 @@ public class RecognitionException<T:ATNSimulator> {
private var offendingState = -1
public var message: String?
public init(_ recognizer: Recognizer<T>?,
_ input: IntStream,
_ ctx: ParserRuleContext?) {
self.recognizer = recognizer
self.input = input
self.ctx = ctx
if let recognizer = recognizer {
self.offendingState = recognizer.getState()
}
}
public init(_ message: String,
_ recognizer: Recognizer<T>?,
public init(_ recognizer: RecognizerProtocol?,
_ input: IntStream,
_ ctx: ParserRuleContext?) {
self.message = message
_ ctx: ParserRuleContext? = nil,
_ message: String? = nil) {
self.recognizer = recognizer
self.input = input
self.ctx = ctx
self.message = message
if let recognizer = recognizer {
self.offendingState = recognizer.getState()
}
@ -87,7 +76,6 @@ public class RecognitionException<T:ATNSimulator> {
if let recognizer = recognizer {
return try? recognizer.getATN().getExpectedTokens(offendingState, ctx!)
}
return nil
}
@ -134,7 +122,7 @@ public class RecognitionException<T:ATNSimulator> {
/// - Returns: The recognizer where this exception occurred, or `null` if
/// the recognizer is not available.
///
public func getRecognizer() -> Recognizer<T>? {
public func getRecognizer() -> RecognizerProtocol? {
return recognizer
}
}

20
runtime/Swift/Sources/Antlr4/Recognizer.swift
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@ -5,13 +5,25 @@
import Foundation
open class Recognizer<ATNInterpreter:ATNSimulator> {
public protocol RecognizerProtocol {
func getATN() -> ATN
func getGrammarFileName() -> String
func getParseInfo() -> ParseInfo?
func getRuleNames() -> [String]
func getSerializedATN() -> String
func getState() -> Int
func getTokenType(_ tokenName: String) -> Int
func getVocabulary() -> Vocabulary
}
open class Recognizer<ATNInterpreter: ATNSimulator>: RecognizerProtocol {
//TODO: WeakKeyDictionary NSMapTable Dictionary MapTable<Vocabulary,HashMap<String, Int>>
private let tokenTypeMapCache = HashMap<Vocabulary, [String : Int]>()
private let ruleIndexMapCache = HashMap<ArrayWrapper<String>, [String : Int]>()
private var _listeners: [ANTLRErrorListener] = [ConsoleErrorListener.INSTANCE]
public var _interp: ATNInterpreter!
@ -151,8 +163,8 @@ open class Recognizer<ATNInterpreter:ATNSimulator> {
///
/// What is the error header, normally line/character position information?
///
open func getErrorHeader(_ e: AnyObject) -> String {
let offending = (e as! RecognitionException).getOffendingToken()
open func getErrorHeader(_ e: RecognitionException) -> String {
let offending = e.getOffendingToken()
let line = offending.getLine()
let charPositionInLine = offending.getCharPositionInLine()
return "line \(line):\(charPositionInLine)"

2
runtime/Swift/Sources/Antlr4/misc/exception/ANTLRException.swift
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@ -16,5 +16,5 @@ import Foundation
public enum ANTLRException: Error {
case cannotInvokeStartRule
case recognition(e:AnyObject)
case recognition(e: RecognitionException)
}

4
tool/resources/org/antlr/v4/tool/templates/codegen/Swift/Swift.stg
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@ -589,7 +589,7 @@ case <i><if(!choice.ast.greedy)>+1<endif>:
Sync(s) ::= "sync(<s.expecting.name>);"
ThrowNoViableAlt(t) ::= "throw try ANTLRException.recognition(e: NoViableAltException(self))"
ThrowNoViableAlt(t) ::= "throw ANTLRException.recognition(e: NoViableAltException(self))"
TestSetInline(s) ::= <<
<!<s.bitsets:{bits | <if(rest(rest(bits.ttypes)))><bitsetBitfieldComparison(s, bits)><else><bitsetInlineComparison(s, bits)><endif>}; separator=" || ">!>
@ -694,7 +694,7 @@ ArgAction(a, chunks) ::= "<chunks>"
SemPred(p, chunks, failChunks) ::= <<
setState(<p.stateNumber>)
if (!(<chunks>)) {
throw try ANTLRException.recognition(e:FailedPredicateException(self, <p.predicate><if(failChunks)>, <failChunks><elseif(p.msg)>, <p.msg><endif>))
throw ANTLRException.recognition(e:FailedPredicateException(self, <p.predicate><if(failChunks)>, <failChunks><elseif(p.msg)>, <p.msg><endif>))
}
>>