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// Copyright 2018 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package common
import (
"fmt"
"sort"
"strings"
)
// Errors type which contains a list of errors observed during parsing.
type Errors struct {
errors []*Error
source Source
numErrors int
maxErrorsToReport int
}
// NewErrors creates a new instance of the Errors type.
func NewErrors(source Source) *Errors {
return &Errors{
errors: []*Error{},
source: source,
maxErrorsToReport: 100,
}
}
// ReportError records an error at a source location.
func (e *Errors) ReportError(l Location, format string, args ...any) {
e.ReportErrorAtID(0, l, format, args...)
}
// ReportErrorAtID records an error at a source location and expression id.
func (e *Errors) ReportErrorAtID(id int64, l Location, format string, args ...any) {
e.numErrors++
if e.numErrors > e.maxErrorsToReport {
return
}
err := &Error{
ExprID: id,
Location: l,
Message: fmt.Sprintf(format, args...),
}
e.errors = append(e.errors, err)
}
// GetErrors returns the list of observed errors.
func (e *Errors) GetErrors() []*Error {
return e.errors[:]
}
// Append creates a new Errors object with the current and input errors.
func (e *Errors) Append(errs []*Error) *Errors {
return &Errors{
errors: append(e.errors[:], errs...),
source: e.source,
numErrors: e.numErrors + len(errs),
maxErrorsToReport: e.maxErrorsToReport,
}
}
// ToDisplayString returns the error set to a newline delimited string.
func (e *Errors) ToDisplayString() string {
errorsInString := e.maxErrorsToReport
if e.numErrors > e.maxErrorsToReport {
// add one more error to indicate the number of errors truncated.
errorsInString++
} else {
// otherwise the error set will just contain the number of errors.
errorsInString = e.numErrors
}
result := make([]string, errorsInString)
sort.SliceStable(e.errors, func(i, j int) bool {
ei := e.errors[i].Location
ej := e.errors[j].Location
return ei.Line() < ej.Line() ||
(ei.Line() == ej.Line() && ei.Column() < ej.Column())
})
for i, err := range e.errors {
// This can happen during the append of two errors objects
if i >= e.maxErrorsToReport {
break
}
result[i] = err.ToDisplayString(e.source)
}
if e.numErrors > e.maxErrorsToReport {
result[e.maxErrorsToReport] = fmt.Sprintf("%d more errors were truncated", e.numErrors-e.maxErrorsToReport)
}
return strings.Join(result, "\n")
}
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