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error.go
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error.go
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// seehuhn.de/go/postscript - a rudimentary PostScript interpreter
// Copyright (C) 2023 Jochen Voss <voss@seehuhn.de>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
package postscript
import (
"errors"
"fmt"
)
var defaultErrorHandler = builtin(defaultErrorHandlerFn)
func defaultErrorHandlerFn(intp *Interpreter) error {
return intp.errors[len(intp.errors)-1]
}
func (intp *Interpreter) e(tp Name, format string, a ...any) error {
return &postScriptError{tp, fmt.Sprintf(format, a...)}
}
type postScriptError struct {
tp Name
msg string
}
func (err *postScriptError) Error() string {
return fmt.Sprintf("%s: %s", string(err.tp), err.msg)
}
var (
eConfigurationerror = Name("configurationerror")
eDictfull = Name("dictfull")
eDictstackoverflow = Name("dictstackoverflow")
eDictstackunderflow = Name("dictstackunderflow")
eExecstackoverflow = Name("execstackoverflow")
eHandleerror = Name("handleerror")
eInterrupt = Name("interrupt")
eInvalidaccess = Name("invalidaccess")
eInvalidexit = Name("invalidexit")
eInvalidfileaccess = Name("invalidfileaccess")
eInvalidfont = Name("invalidfont")
eInvalidrestore = Name("invalidrestore")
eIoerror = Name("ioerror")
eLimitcheck = Name("limitcheck")
eNocurrentpoint = Name("nocurrentpoint")
eRangecheck = Name("rangecheck")
eStackoverflow = Name("stackoverflow")
eStackunderflow = Name("stackunderflow")
eSyntaxerror = Name("syntaxerror")
eTimeout = Name("timeout")
eTypecheck = Name("typecheck")
eUndefined = Name("undefined")
eUndefinedfilename = Name("undefinedfilename")
eUndefinedresource = Name("undefinedresource")
eUndefinedresult = Name("undefinedresult")
eUnmatchedmark = Name("unmatchedmark")
eUnregistered = Name("unregistered")
eVMerror = Name("VMerror")
)
var allErrors = []Name{
eConfigurationerror,
eDictfull,
eDictstackoverflow,
eDictstackunderflow,
eExecstackoverflow,
eHandleerror,
eInterrupt,
eInvalidaccess,
eInvalidexit,
eInvalidfileaccess,
eInvalidfont,
eInvalidrestore,
eIoerror,
eLimitcheck,
eNocurrentpoint,
eRangecheck,
eStackoverflow,
eStackunderflow,
eSyntaxerror,
eTimeout,
eTypecheck,
eUndefined,
eUndefinedfilename,
eUndefinedresource,
eUndefinedresult,
eUnmatchedmark,
eUnregistered,
eVMerror,
}
var (
ErrExecutionLimitExceeded = &postScriptError{eInterrupt, "execution limit exceeded"}
ErrNoPostScript = errors.New("not a PostScript file")
)