listener

Documentation

Overview

Package listener adds semantic error handling to a standard antlr.DiagnosticListener and conforms to the go error handling infrastructure

Index

• type Diagnostic
  • func (d Diagnostic) String() string
• type Listener
  • func New(path string) *Listener
  • func (el *Listener) Error() string
  • func (el *Listener) ErrorCount() int
  • func (el *Listener) SemErr(offendingToken antlr.Token, msg string)
  • func (el *Listener) SemanticError(line, column int, msg string)
  • func (el *Listener) SyntaxError(recognizer antlr.Recognizer, offendingSymbol interface{}, line, column int, ...)

Types

type Diagnostic

type Diagnostic struct {
	Type    string
	Path    string
	Line    int
	Column  int
	Message string
}

Diagnostic represents a locatable error in an FSE spec

func (Diagnostic) String

func (d Diagnostic) String() string

type Listener

type Listener struct {
	Path string
	*antlr.DiagnosticErrorListener
	Diagnostics []Diagnostic
}

Listener records and logs syntax errors produced by the antlr4 parser

func New

func New(path string) *Listener

New creates a new Listener

func (*Listener) Error

func (el *Listener) Error() string

Error makes Listener itself an error

func (*Listener) ErrorCount

func (el *Listener) ErrorCount() int

ErrorCount counts the number of Diagnostic messages

func (*Listener) SemErr

func (el *Listener) SemErr(
	offendingToken antlr.Token,
	msg string,
)

SemErr logs a semantic error

func (*Listener) SemanticError

func (el *Listener) SemanticError(
	line, column int,
	msg string,
)

SemanticError logs a semantic error

func (*Listener) SyntaxError

func (el *Listener) SyntaxError(
	recognizer antlr.Recognizer,
	offendingSymbol interface{},
	line, column int,
	msg string,
	e antlr.RecognitionException,
)

SyntaxError implements an interface method of antlr.DiagnosticListener