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// Copyright 2021-present The Atlas Authors. All rights reserved.
// This source code is licensed under the Apache 2.0 license found
// in the LICENSE file in the root directory of this source tree.
package myparse
import (
"fmt"
"ariga.io/atlas/cmd/atlas/internal/sqlparse/parseutil"
"ariga.io/atlas/sql/migrate"
"ariga.io/atlas/sql/schema"
"github.com/pingcap/tidb/parser"
"github.com/pingcap/tidb/parser/ast"
"github.com/pingcap/tidb/parser/mysql"
_ "github.com/pingcap/tidb/parser/test_driver"
"golang.org/x/exp/slices"
)
// Parser implements the sqlparse.Parser
type Parser struct{}
// ColumnFilledBefore checks if the column was filled before the given position.
func (p *Parser) ColumnFilledBefore(f migrate.File, t *schema.Table, c *schema.Column, pos int) (bool, error) {
return parseutil.MatchStmtBefore(f, pos, func(s *migrate.Stmt) (bool, error) {
stmt, err := parser.New().ParseOneStmt(s.Text, "", "")
if err != nil {
return false, err
}
u, ok := stmt.(*ast.UpdateStmt)
// Ensure the table was updated.
if !ok || !tableUpdated(u, t) {
return false, nil
}
// Accept UPDATE that fills all rows or those with NULL values as we cannot
// determine if NULL values were filled in case there is a custom filtering.
affectC := func() bool {
if u.Where == nil {
return true
}
is, ok := u.Where.(*ast.IsNullExpr)
if !ok || is.Not {
return false
}
n, ok := is.Expr.(*ast.ColumnNameExpr)
return ok && n.Name.Name.O == c.Name
}()
idx := slices.IndexFunc(u.List, func(a *ast.Assignment) bool {
return a.Column.Name.String() == c.Name && a.Expr != nil && a.Expr.GetType().GetType() != mysql.TypeNull
})
// Ensure the column was filled.
return affectC && idx != -1, nil
})
}
// FixChange fixes the changes according to the given statement.
func (p *Parser) FixChange(d migrate.Driver, s string, changes schema.Changes) (schema.Changes, error) {
stmt, err := parser.New().ParseOneStmt(s, "", "")
if err != nil {
return nil, err
}
if len(changes) == 0 {
return changes, nil
}
switch stmt := stmt.(type) {
case *ast.AlterTableStmt:
if changes, err = renameTable(d, stmt, changes); err != nil {
return nil, err
}
modify, ok := changes[0].(*schema.ModifyTable)
if !ok {
return nil, fmt.Errorf("expected modify-table change for alter-table statement, but got: %T", changes[0])
}
for _, r := range renameColumns(stmt) {
parseutil.RenameColumn(modify, r)
}
for _, r := range renameIndexes(stmt) {
parseutil.RenameIndex(modify, r)
}
case *ast.RenameTableStmt:
for _, t := range stmt.TableToTables {
changes = parseutil.RenameTable(
changes,
&parseutil.Rename{
From: t.OldTable.Name.O,
To: t.NewTable.Name.O,
})
}
}
return changes, nil
}
// renameColumns returns all renamed columns that exist in the statement.
func renameColumns(stmt *ast.AlterTableStmt) (rename []*parseutil.Rename) {
for _, s := range stmt.Specs {
if s.Tp == ast.AlterTableRenameColumn {
rename = append(rename, &parseutil.Rename{
From: s.OldColumnName.Name.O,
To: s.NewColumnName.Name.O,
})
}
}
return
}
// renameIndexes returns all renamed indexes that exist in the statement.
func renameIndexes(stmt *ast.AlterTableStmt) (rename []*parseutil.Rename) {
for _, s := range stmt.Specs {
if s.Tp == ast.AlterTableRenameIndex {
rename = append(rename, &parseutil.Rename{
From: s.FromKey.O,
To: s.ToKey.O,
})
}
}
return
}
// renameTable fixes the changes from ALTER command with RENAME into ModifyTable and RenameTable.
func renameTable(drv migrate.Driver, stmt *ast.AlterTableStmt, changes schema.Changes) (schema.Changes, error) {
var r *ast.AlterTableSpec
for _, s := range stmt.Specs {
if s.Tp == ast.AlterTableRenameTable {
r = s
break
}
}
if r == nil {
return changes, nil
}
if len(changes) != 2 {
return nil, fmt.Errorf("unexected number fo changes for ALTER command with RENAME clause: %d", len(changes))
}
i, j := changes.IndexDropTable(stmt.Table.Name.O), changes.IndexAddTable(r.NewTable.Name.O)
if i == -1 {
return nil, fmt.Errorf("DropTable %q change was not found in changes", stmt.Table.Name)
}
if j == -1 {
return nil, fmt.Errorf("AddTable %q change was not found in changes", r.NewTable.Name)
}
fromT, toT := changes[0].(*schema.DropTable).T, changes[1].(*schema.AddTable).T
fromT.Name = toT.Name
diff, err := drv.TableDiff(fromT, toT)
if err != nil {
return nil, err
}
changeT := *toT
changeT.Name = stmt.Table.Name.O
return schema.Changes{
// Modify the table first.
&schema.ModifyTable{T: &changeT, Changes: diff},
// Then, apply the RENAME.
&schema.RenameTable{From: &changeT, To: toT},
}, nil
}
// tableUpdated checks if the table was updated in the statement.
func tableUpdated(u *ast.UpdateStmt, t *schema.Table) bool {
if u.TableRefs == nil || u.TableRefs.TableRefs == nil || u.TableRefs.TableRefs.Left == nil {
return false
}
ts, ok := u.TableRefs.TableRefs.Left.(*ast.TableSource)
if !ok {
return false
}
n, ok := ts.Source.(*ast.TableName)
return ok && n.Name.O == t.Name && (n.Schema.O == "" || n.Schema.O == t.Schema.Name)
}
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