forked from src-d/go-mysql-server
/
show_create.go
113 lines (97 loc) · 2.02 KB
/
show_create.go
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package parse
import (
"bufio"
"io"
"strings"
"github.com/src-d/go-mysql-server/sql"
"github.com/src-d/go-mysql-server/sql/plan"
"gopkg.in/src-d/go-errors.v1"
)
var errUnsupportedShowCreateQuery = errors.NewKind("Unsupported query: SHOW CREATE %s")
func parseShowCreate(s string) (sql.Node, error) {
r := bufio.NewReader(strings.NewReader(s))
var thingToShow string
err := parseFuncs{
expect("show"),
skipSpaces,
expect("create"),
skipSpaces,
readIdent(&thingToShow),
skipSpaces,
}.exec(r)
if err != nil {
return nil, err
}
switch strings.ToLower(thingToShow) {
case "table":
var db, table string
if err := readQuotableIdent(&table)(r); err != nil {
return nil, err
}
ru, _, err := r.ReadRune()
if err != nil && err != io.EOF {
return nil, err
} else if err == nil && ru == '.' {
db = table
if err = readQuotableIdent(&table)(r); err != nil {
return nil, err
}
}
err = parseFuncs{
skipSpaces,
checkEOF,
}.exec(r)
if err != nil {
return nil, err
}
return plan.NewShowCreateTable(
db,
nil,
table), nil
case "database", "schema":
var ifNotExists bool
var next string
nextByte, err := r.Peek(1)
if err != nil {
return nil, err
}
// If ` is the next character, it's a db name. Otherwise it may be
// a table name or IF NOT EXISTS.
if nextByte[0] == '`' {
if err = readQuotableIdent(&next)(r); err != nil {
return nil, err
}
} else {
if err = readIdent(&next)(r); err != nil {
return nil, err
}
if next == "if" {
ifNotExists = true
err = parseFuncs{
skipSpaces,
expect("not"),
skipSpaces,
expect("exists"),
skipSpaces,
readQuotableIdent(&next),
}.exec(r)
if err != nil {
return nil, err
}
}
}
err = parseFuncs{
skipSpaces,
checkEOF,
}.exec(r)
if err != nil {
return nil, err
}
return plan.NewShowCreateDatabase(
sql.UnresolvedDatabase(next),
ifNotExists,
), nil
default:
return nil, errUnsupportedShowCreateQuery.New(thingToShow)
}
}