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errors.go
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/
errors.go
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//Copyright 2012 Vastech SA (PTY) LTD
//
// 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 golang
import (
"bytes"
"path"
"text/template"
"github.com/johnkerl/gocc/internal/io"
)
func GenErrors(pkg, outDir string) {
tmpl, err := template.New("parser errors").Parse(errorsSrc[1:])
if err != nil {
panic(err)
}
wr := new(bytes.Buffer)
if err := tmpl.Execute(wr, path.Join(pkg, "token")); err != nil {
panic(err)
}
io.WriteFile(path.Join(outDir, "errors", "errors.go"), wr.Bytes())
}
const errorsSrc = `
// Code generated by gocc; DO NOT EDIT.
package errors
import (
"fmt"
"strings"
"{{.}}"
)
type ErrorSymbol interface {
}
type Error struct {
Err error
ErrorToken *token.Token
ErrorSymbols []ErrorSymbol
ExpectedTokens []string
StackTop int
}
func (e *Error) String() string {
w := new(strings.Builder)
fmt.Fprintf(w, "Error")
if e.Err != nil {
fmt.Fprintf(w, " %s\n", e.Err)
} else {
fmt.Fprintf(w, "\n")
}
fmt.Fprintf(w, "Token: type=%d, lit=%s\n", e.ErrorToken.Type, e.ErrorToken.Lit)
fmt.Fprintf(w, "Pos: offset=%d, line=%d, column=%d\n", e.ErrorToken.Pos.Offset, e.ErrorToken.Pos.Line, e.ErrorToken.Pos.Column)
fmt.Fprintf(w, "Expected one of: ")
for _, sym := range e.ExpectedTokens {
fmt.Fprintf(w, "%s ", sym)
}
fmt.Fprintf(w, "ErrorSymbol:\n")
for _, sym := range e.ErrorSymbols {
fmt.Fprintf(w, "%v\n", sym)
}
return w.String()
}
func (e *Error) Error() string {
w := new(strings.Builder)
fmt.Fprintf(w, "Error in S%d: %s, %s", e.StackTop, token.TokMap.TokenString(e.ErrorToken), e.ErrorToken.Pos.String())
if e.Err != nil {
fmt.Fprintf(w, ": %+v", e.Err)
} else {
fmt.Fprintf(w, ", expected one of: ")
for _, expected := range e.ExpectedTokens {
fmt.Fprintf(w, "%s ", expected)
}
}
return w.String()
}
`