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Interface IParserErrorMessageProvider

A set of methods used to customize parsing error messages. Call defaultParserErrorProvider to implement the default behavior

Hierarchy

  • IParserErrorMessageProvider

Index

Methods

buildEarlyExitMessage

  • buildEarlyExitMessage(options: { actual: IToken[]; customUserDescription?: string; expectedIterationPaths: TokenType[][]; previous: IToken; ruleName: string }): string
  • An Early Exit Error happens when the parser cannot detect the first mandatory iteration of a repetition. It corresponds to a failed {@link Parser.AT_LEAST_ONE} or {@link Parser.AT_LEAST_ONE_SEP} in Chevrotain DSL terms.

    Parameters

    • options: { actual: IToken[]; customUserDescription?: string; expectedIterationPaths: TokenType[][]; previous: IToken; ruleName: string }
      • actual: IToken[]

        The actual sequence of tokens encountered.

      • Optional customUserDescription?: string

        A user may provide custom error message descriptor in the {@link Parser.AT_LEAST_ONE} DSL method options parameter, this is that custom message.

      • expectedIterationPaths: TokenType[][]

        The valid (expected) paths in the first iteration.

      • previous: IToken

        The previous Token "instance". This is useful if options.actual[0] is of type chevrotain.EOF and you need to know the last token parsed.

      • ruleName: string

        The rule in which the error occurred.

    Returns string

buildMismatchTokenMessage

  • buildMismatchTokenMessage(options: { actual: IToken; expected: TokenType; previous: IToken; ruleName: string }): string
  • Mismatched Token Error happens when the parser attempted to consume a terminal and failed. It corresponds to a failed {@link Parser.CONSUME} in Chevrotain DSL terms.

    Parameters

    • options: { actual: IToken; expected: TokenType; previous: IToken; ruleName: string }
      • actual: IToken

        The actual Token "instance".

      • expected: TokenType

        The expected Token Type.

      • previous: IToken

        The previous Token "instance". This is useful if options.actual[0] is of type chevrotain.EOF and you need to know the last token parsed.

      • ruleName: string

        The rule in which the error occurred.

    Returns string

buildNoViableAltMessage

  • buildNoViableAltMessage(options: { actual: IToken[]; customUserDescription?: string; expectedPathsPerAlt: TokenType[][][]; previous: IToken; ruleName: string }): string
  • A No Viable Alternative Error happens when the parser cannot detect any valid alternative in an alternation. It corresponds to a failed {@link Parser.OR} in Chevrotain DSL terms.

    Parameters

    • options: { actual: IToken[]; customUserDescription?: string; expectedPathsPerAlt: TokenType[][][]; previous: IToken; ruleName: string }
      • actual: IToken[]

        The actual sequence of tokens encountered.

      • Optional customUserDescription?: string

        A user may provide custom error message descriptor in the {@link Parser.AT_LEAST_ONE} DSL method options parameter, this is that custom message.

      • expectedPathsPerAlt: TokenType[][][]

        First level of the array represents each alternative The next two levels represent valid (expected) paths in each alternative.

      • previous: IToken

        The previous Token "instance". This is useful if options.actual[0] is of type chevrotain.EOF and you need to know the last token parsed.

      • ruleName: string

        The rule in which the error occurred.

    Returns string

buildNotAllInputParsedMessage

  • buildNotAllInputParsedMessage(options: { firstRedundant: IToken; ruleName: string }): string
  • A Redundant Input Error happens when the parser has completed parsing but there is still unprocessed input remaining.

    Parameters

    • options: { firstRedundant: IToken; ruleName: string }
      • firstRedundant: IToken

        The first unprocessed token "instance".

      • ruleName: string

        The rule in which the error occurred.

    Returns string

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