/
warnings.go
148 lines (133 loc) · 3.15 KB
/
warnings.go
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// Copyright 2020-2021 Dolthub, Inc.
//
// 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 parse
import (
"bufio"
"bytes"
"io"
"strconv"
"strings"
"unicode"
errors "gopkg.in/src-d/go-errors.v1"
"github.com/dolthub/go-mysql-server/sql"
"github.com/dolthub/go-mysql-server/sql/expression"
"github.com/dolthub/go-mysql-server/sql/plan"
)
var errInvalidIndex = errors.NewKind("invalid %s index %d (index must be non-negative)")
func parseShowWarnings(ctx *sql.Context, s string) (sql.Node, error) {
var (
offstr string
cntstr string
)
r := bufio.NewReader(strings.NewReader(s))
for _, fn := range []parseFunc{
expect("show"),
skipSpaces,
expect("warnings"),
skipSpaces,
func(in *bufio.Reader) error {
if expect("limit")(in) == nil {
skipSpaces(in)
readValue(&cntstr)(in)
skipSpaces(in)
if expectRune(',')(in) == nil {
if readValue(&offstr)(in) == nil {
offstr, cntstr = cntstr, offstr
}
}
}
return nil
},
skipSpaces,
checkEOF,
} {
if err := fn(r); err != nil {
return nil, err
}
}
var (
node sql.Node = plan.ShowWarnings(ctx.Session.Warnings())
offset int
count int
err error
)
if offstr != "" {
if offset, err = strconv.Atoi(offstr); err != nil {
return nil, err
}
if offset < 0 {
return nil, errInvalidIndex.New("offset", offset)
}
}
node = plan.NewOffset(expression.NewLiteral(offset, sql.Int64), node)
if cntstr != "" {
if count, err = strconv.Atoi(cntstr); err != nil {
return nil, err
}
if count < 0 {
return nil, errInvalidIndex.New("count", count)
}
if count > 0 {
node = plan.NewLimit(expression.NewLiteral(count, sql.Int64), node)
}
}
return node, nil
}
func readValue(val *string) parseFunc {
return func(rd *bufio.Reader) error {
var buf bytes.Buffer
var singleQuote, doubleQuote, ignoreNext bool
var first = true
for {
r, _, err := rd.ReadRune()
if err == io.EOF {
break
}
if err != nil {
return err
}
if singleQuote || doubleQuote {
switch true {
case ignoreNext:
ignoreNext = false
case r == '\\':
ignoreNext = true
continue
case r == '\'' && singleQuote:
singleQuote = false
continue
case r == '"' && doubleQuote:
doubleQuote = false
continue
}
} else if first && (r == '\'' || r == '"') {
if r == '\'' {
singleQuote = true
} else {
doubleQuote = true
}
first = false
continue
} else if !unicode.IsLetter(r) && !unicode.IsNumber(r) && r != '_' {
if err := rd.UnreadRune(); err != nil {
return err
}
break
}
buf.WriteRune(r)
}
*val = strings.ToLower(buf.String())
return nil
}
}