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exclude.go
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exclude.go
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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 schema
import (
"encoding/csv"
"fmt"
"path/filepath"
"regexp"
"strings"
)
// ExcludeRealm filters resources in the realm based on the given patterns.
func ExcludeRealm(r *Realm, patterns []string) (*Realm, error) {
if len(patterns) == 0 {
return r, nil
}
var schemas []*Schema
globs, err := split(patterns)
if err != nil {
return nil, err
}
Filter:
for _, s := range r.Schemas {
for i, g := range globs {
if len(g) > 3 {
return nil, fmt.Errorf("too many parts in pattern: %q", patterns[i])
}
match, err := filepath.Match(g[0], s.Name)
if err != nil {
return nil, err
}
if match {
// In case there is a match, and it is
// a single glob we exclude this
if len(g) == 1 {
continue Filter
}
if err := excludeS(s, g[1:]); err != nil {
return nil, err
}
}
}
schemas = append(schemas, s)
}
r.Schemas = schemas
return r, nil
}
// ExcludeSchema filters resources in the schema based on the given patterns.
func ExcludeSchema(s *Schema, patterns []string) (*Schema, error) {
if len(patterns) == 0 {
return s, nil
}
if s.Realm == nil {
return nil, fmt.Errorf("missing realm for schema %q", s.Name)
}
for i, p := range patterns {
patterns[i] = fmt.Sprintf("%s.%s", s.Name, p)
}
if _, err := ExcludeRealm(s.Realm, patterns); err != nil {
return nil, err
}
return s, nil
}
// split parses the list of patterns into chain of resource-globs.
// For example, 's*.t.*' is split to ['s*', 't', *].
func split(patterns []string) ([][]string, error) {
globs := make([][]string, len(patterns))
for i, p := range patterns {
r := csv.NewReader(strings.NewReader(p))
r.Comma = '.'
switch parts, err := r.ReadAll(); {
case err != nil:
return nil, err
case len(parts) != 1:
return nil, fmt.Errorf("unexpected pattern: %q", p)
case len(parts[0]) == 0:
return nil, fmt.Errorf("empty pattern: %q", p)
default:
globs[i] = parts[0]
}
}
return globs, nil
}
func excludeS(s *Schema, glob []string) error {
if globE, exclude := excludeType(typeE, glob[0]); exclude {
var objects []Object
for _, t := range s.Objects {
e, ok := t.(*EnumType)
if !ok {
objects = append(objects, t)
continue
}
match, err := filepath.Match(globE, e.T)
if err != nil {
return err
}
// No match or glob has more than one pattern.
if !match || len(glob) != 1 {
objects = append(objects, t)
}
}
s.Objects = objects
}
if globT, exclude := excludeType(typeT, glob[0]); exclude {
var tables []*Table
for _, t := range s.Tables {
match, err := filepath.Match(globT, t.Name)
if err != nil {
return err
}
if match {
// In case there is a match, and it is
// a single glob we exclude this table.
if len(glob) == 1 {
continue
}
if err := excludeT(t, glob[1]); err != nil {
return err
}
}
// No match or glob has more than one pattern.
tables = append(tables, t)
}
s.Tables = tables
}
if globV, exclude := excludeType(typeV, glob[0]); exclude {
var views []*View
for _, v := range s.Views {
match, err := filepath.Match(globV, v.Name)
if err != nil {
return err
}
if match {
if len(glob) == 1 {
continue
}
if err := excludeV(v, glob[1]); err != nil {
return err
}
}
views = append(views, v)
}
s.Views = views
}
if globF, exclude := excludeType(typeFn, glob[0]); exclude {
var err error
s.Funcs, err = filter(s.Funcs, func(f *Func) (bool, error) {
return filepath.Match(globF, f.Name)
})
if err != nil {
return err
}
}
if globP, exclude := excludeType(typePr, glob[0]); exclude {
var err error
s.Procs, err = filter(s.Procs, func(p *Proc) (bool, error) {
return filepath.Match(globP, p.Name)
})
if err != nil {
return err
}
}
return nil
}
func excludeT(t *Table, pattern string) (err error) {
ex := make(map[*Index]struct{})
ef := make(map[*ForeignKey]struct{})
if p, exclude := excludeType(typeC, pattern); exclude {
t.Columns, err = filter(t.Columns, func(c *Column) (bool, error) {
match, err := filepath.Match(p, c.Name)
if !match || err != nil {
return false, err
}
for _, idx := range c.Indexes {
ex[idx] = struct{}{}
}
for _, fk := range c.ForeignKeys {
ef[fk] = struct{}{}
}
return true, nil
})
}
if p, exclude := excludeType(typeI, pattern); exclude {
t.Indexes, err = filter(t.Indexes, func(idx *Index) (bool, error) {
if _, ok := ex[idx]; ok {
return true, nil
}
return filepath.Match(p, idx.Name)
})
}
if p, exclude := excludeType(typeF, pattern); exclude {
t.ForeignKeys, err = filter(t.ForeignKeys, func(fk *ForeignKey) (bool, error) {
if _, ok := ef[fk]; ok {
return true, nil
}
return filepath.Match(p, fk.Symbol)
})
}
if p, exclude := excludeType(typeK, pattern); exclude {
t.Attrs, err = filter(t.Attrs, func(a Attr) (bool, error) {
c, ok := a.(*Check)
if !ok {
return false, nil
}
match, err := filepath.Match(p, c.Name)
if !match || err != nil {
return false, err
}
return true, nil
})
}
return
}
func excludeV(t *View, pattern string) (err error) {
if p, exclude := excludeType(typeC, pattern); exclude {
t.Columns, err = filter(t.Columns, func(c *Column) (bool, error) {
match, err := filepath.Match(p, c.Name)
if !match || err != nil {
return false, err
}
return true, nil
})
}
return
}
const (
typeE = "enum"
typeV = "view"
typeT = "table"
typeC = "column"
typeI = "index"
typeF = "fk"
typeK = "check"
typeFn = "function"
typePr = "procedure"
)
var reTypeVT = regexp.MustCompile(`\[type=([a-z|]+)+\]$`)
func excludeType(t, v string) (string, bool) {
matches := reTypeVT.FindStringSubmatch(v)
if len(matches) != 2 {
return v, true
}
v = strings.TrimSuffix(v, matches[0])
for _, m := range strings.Split(matches[1], "|") {
if m == t {
// Selector matches.
return v, true
}
}
// There is a selector with no match.
return v, false
}
func filter[T any](s []T, f func(T) (bool, error)) ([]T, error) {
r := make([]T, 0, len(s))
for i := range s {
match, err := f(s[i])
if err != nil {
return nil, err
}
if !match {
r = append(r, s[i])
}
}
return r, nil
}