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71 lines
1.8 KiB
Go
71 lines
1.8 KiB
Go
// Copyright 2017 Google LLC. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package compiler
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import "fmt"
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// Error represents compiler errors and their location in the document.
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type Error struct {
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Context *Context
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Message string
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}
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// NewError creates an Error.
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func NewError(context *Context, message string) *Error {
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return &Error{Context: context, Message: message}
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}
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func (err *Error) locationDescription() string {
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if err.Context.Node != nil {
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return fmt.Sprintf("[%d,%d] %s", err.Context.Node.Line, err.Context.Node.Column, err.Context.Description())
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}
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return err.Context.Description()
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}
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// Error returns the string value of an Error.
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func (err *Error) Error() string {
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if err.Context == nil {
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return err.Message
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}
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return err.locationDescription() + " " + err.Message
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}
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// ErrorGroup is a container for groups of Error values.
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type ErrorGroup struct {
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Errors []error
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}
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// NewErrorGroupOrNil returns a new ErrorGroup for a slice of errors or nil if the slice is empty.
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func NewErrorGroupOrNil(errors []error) error {
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if len(errors) == 0 {
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return nil
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} else if len(errors) == 1 {
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return errors[0]
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} else {
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return &ErrorGroup{Errors: errors}
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}
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}
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func (group *ErrorGroup) Error() string {
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result := ""
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for i, err := range group.Errors {
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if i > 0 {
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result += "\n"
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}
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result += err.Error()
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}
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return result
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}
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