82 lines
1.7 KiB
Go
82 lines
1.7 KiB
Go
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package common
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import (
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"errors"
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"fmt"
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)
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type FilterResult byte
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const (
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No FilterResult = iota
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Maybe
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Yes
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)
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func IfThenElse(condition bool, onSuccess, onFailure FilterResult) FilterResult {
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var res FilterResult
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if condition {
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res = onSuccess
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} else {
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res = onFailure
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}
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return res
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}
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type SchemaEntry interface {
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String() string
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DetailedString() string
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Filter(typ string, val any) FilterResult
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}
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type (
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Parser func(key, value []byte) (SchemaEntry, Parser, error)
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FallbackParser func(key, value []byte) (SchemaEntry, Parser)
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)
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func Any(parsers ...Parser) Parser {
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return func(key, value []byte) (SchemaEntry, Parser, error) {
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var errs error
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for _, parser := range parsers {
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ret, next, err := parser(key, value)
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if err == nil {
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return ret, next, nil
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}
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errs = errors.Join(errs, err)
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}
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return nil, nil, fmt.Errorf("no parser succeeded: %w", errs)
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}
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}
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func WithFallback(parser Parser, fallback FallbackParser) Parser {
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if parser == nil {
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return fallback.ToParser()
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}
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return func(key, value []byte) (SchemaEntry, Parser, error) {
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entry, next, err := parser(key, value)
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if err == nil {
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return entry, WithFallback(next, fallback), nil
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}
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return fallback.ToParser()(key, value)
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}
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}
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func (fp FallbackParser) ToParser() Parser {
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return func(key, value []byte) (SchemaEntry, Parser, error) {
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entry, next := fp(key, value)
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return entry, next, nil
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}
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}
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func (p Parser) ToFallbackParser() FallbackParser {
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return func(key, value []byte) (SchemaEntry, Parser) {
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entry, next, err := p(key, value)
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if err != nil {
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panic(fmt.Errorf(
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"couldn't use that parser as a fallback parser, it returned an error: %w", err,
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))
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}
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return entry, next
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}
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}
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