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|
package shell
import (
"errors"
"fmt"
"os"
"strings"
"github.com/jpappel/atlas/pkg/query"
)
type ValueType int
const (
INVALID ValueType = iota
STRING
TOKENS
CLAUSE
)
type Value struct {
Type ValueType
Val any
}
type State map[string]Value
func (v Value) String() string {
switch v.Type {
case STRING:
s, ok := v.Val.(string)
if !ok {
return "Corrupted Type (expected string)"
}
return s
case TOKENS:
ts, ok := v.Val.([]query.Token)
if !ok {
return "Corrupted Type (expected []query.Token)"
}
return query.TokensStringify(ts)
case CLAUSE:
rootClause, ok := v.Val.(*query.Clause)
if !ok {
return "Corrupted Type (expected query.Clause)"
}
return rootClause.String()
case INVALID:
return "Invalid"
}
return fmt.Sprintf("Unknown @ %p", v.Val)
}
func (s State) String() string {
b := strings.Builder{}
for k, v := range s {
b.WriteString(k)
b.WriteByte(':')
switch v.Type {
case INVALID:
b.WriteString(" Invalid")
case STRING:
b.WriteString(" String")
case TOKENS:
b.WriteString(" Tokens")
case CLAUSE:
b.WriteString(" Clause")
default:
fmt.Fprintf(&b, " Unknown (%d)", v.Val)
}
b.WriteByte('\n')
}
return b.String()
}
func (s State) CmdTokenize(input string) (Value, bool) {
if len(input) == 0 {
return Value{}, false
}
var rawQuery string
if input[0] == '`' {
rawQuery = input[1:]
} else {
variable, ok := s[input]
if !ok {
fmt.Fprintln(os.Stderr, "Cannot tokenize: no variable with name", input)
return Value{}, false
} else if variable.Type != STRING {
fmt.Fprintln(os.Stderr, "Cannot tokenize: variable is not a string")
return Value{}, false
}
rawQuery, ok = variable.Val.(string)
if !ok {
fmt.Fprintln(os.Stderr, "Cannot tokenize: type corruption")
fmt.Fprintln(os.Stderr, "Type corruption, expected string")
panic("Type corruption")
}
}
tokens := query.Lex(rawQuery)
return Value{TOKENS, tokens}, true
}
func (s State) CmdParse(args string) (Value, error) {
if len(args) == 0 {
return Value{}, errors.New("no arguments for parse")
}
var tokens []query.Token
if tokenizeArgs, found := strings.CutPrefix(args, "tokenize "); found {
val, ok := s.CmdTokenize(tokenizeArgs)
if !ok {
return Value{}, errors.New("error occured during tokenization")
}
tokens = val.Val.([]query.Token)
} else {
variable, ok := s[args]
if !ok {
fmt.Fprintln(os.Stderr, "Cannot parse: no variable with name", args)
return Value{}, errors.New("variable does not exist")
} else if variable.Type != TOKENS {
fmt.Fprintln(os.Stderr, "Cannot parse: variable is not []query.Tokens")
return Value{}, errors.New("bad variable type")
}
tokens, ok = variable.Val.([]query.Token)
if !ok {
fmt.Fprintln(os.Stderr, "Cannot parse: type corruption")
fmt.Fprintln(os.Stderr, "Type corruption, expected []query.Tokens")
panic("Type corruption")
}
}
clause, err := query.Parse(tokens)
if err != nil {
return Value{}, err
}
return Value{CLAUSE, *clause}, err
}
|
