48 lines
1.2 KiB
Go
48 lines
1.2 KiB
Go
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package parse
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import (
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"bytes"
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"fmt"
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"io"
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)
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// Error is a parsing error returned by parser. It contains a message and an offset at which the error occurred.
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type Error struct {
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Message string
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Line int
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Column int
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Context string
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}
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// NewError creates a new error
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func NewError(r io.Reader, offset int, message string, a ...interface{}) *Error {
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line, column, context := Position(r, offset)
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if 0 < len(a) {
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message = fmt.Sprintf(message, a...)
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}
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return &Error{
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Message: message,
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Line: line,
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Column: column,
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Context: context,
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}
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}
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// NewErrorLexer creates a new error from an active Lexer.
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func NewErrorLexer(l *Input, message string, a ...interface{}) *Error {
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r := bytes.NewBuffer(l.Bytes())
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offset := l.Offset()
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return NewError(r, offset, message, a...)
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}
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// Position returns the line, column, and context of the error.
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// Context is the entire line at which the error occurred.
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func (e *Error) Position() (int, int, string) {
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return e.Line, e.Column, e.Context
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}
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// Error returns the error string, containing the context and line + column number.
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func (e *Error) Error() string {
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return fmt.Sprintf("%s on line %d and column %d\n%s", e.Message, e.Line, e.Column, e.Context)
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}
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