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moved.go
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moved.go
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package tfclean
import (
"bytes"
"fmt"
"strings"
"text/scanner"
"unicode"
"github.com/fujiwara/tfstate-lookup/tfstate"
"github.com/hashicorp/hcl/v2/hclsyntax"
)
type MoveBlock struct {
From string
To string
}
func (app *App) processMovedBlock(block *hclsyntax.Block, state *tfstate.TFState, data []byte) ([]byte, error) {
from, _ := app.getValueFromAttribute(block.Body.Attributes["from"])
to, _ := app.getValueFromAttribute(block.Body.Attributes["to"])
if state != nil {
isApplied, err := app.movedBlockIsApplied(state, from, to)
if err != nil {
return data, err
}
if isApplied {
data, err = app.cutMovedBlock(data, to, from)
if err != nil {
return data, err
}
}
} else {
data, err := app.cutMovedBlock(data, to, from)
if err != nil {
return data, err
}
return data, nil
}
return data, nil
}
func (app *App) movedBlockIsApplied(state *tfstate.TFState, from string, to string) (bool, error) {
if len(strings.Split(from, ".")) == 2 && len(strings.Split(to, ".")) == 2 {
// from and to is module
names, err := state.List()
if err != nil {
return false, err
}
existsFrom := false
for _, name := range names {
if strings.HasPrefix(name, from+".") {
existsFrom = true
break
}
}
existsTo := false
for _, name := range names {
if strings.HasPrefix(name, to+".") {
existsTo = true
break
}
}
if !existsFrom && existsTo {
return true, nil
}
if !existsFrom && !existsTo {
return true, nil
}
return false, nil
} else {
// from and to is resource
fromAttrs, err := state.Lookup(from)
if err != nil {
return false, err
}
toAttrs, err := state.Lookup(to)
if err != nil {
return false, err
}
if fromAttrs.String() == "null" && toAttrs.String() != "null" {
return true, nil
}
return false, nil
}
}
func (app *App) cutMovedBlock(data []byte, to string, from string) ([]byte, error) {
var s scanner.Scanner
s.Init(bytes.NewReader(data))
s.Mode = scanner.ScanIdents | scanner.ScanFloats
s.IsIdentRune = func(ch rune, i int) bool {
return ch == '-' || ch == '_' || ch == '.' || ch == '"' || ch == '[' || ch == ']' || unicode.IsLetter(ch) || unicode.IsDigit(ch) && i > 0
}
var lastPos int
for tok := s.Scan(); tok != scanner.EOF; tok = s.Scan() {
if s.TokenText() == "moved" && isAtLineStart(data, lastPos, s.Position.Offset) {
found, data, err := app.readMovedBlock(&s, data, to, from, s.Offset)
if err != nil {
return nil, err
}
if found {
return data, nil
}
}
lastPos = s.Position.Offset
}
return nil, nil
}
func (app *App) readMovedBlock(s *scanner.Scanner, data []byte, to string, from string, lastPos int) (bool, []byte, error) {
var spos, epos int
var movedBlock MoveBlock
var current string
spos = lastPos
for tok := s.Scan(); tok != scanner.EOF; tok = s.Scan() {
switch s.TokenText() {
case "{":
// Ignore
case "}":
// Remove moved block that includes `}` and newline
epos = s.Offset + 2
if movedBlock.To == to && movedBlock.From == from {
data = bytes.Join([][]byte{data[:spos], data[epos:]}, []byte(""))
return true, data, nil
}
return false, nil, nil
case "from":
current = "from"
case "to":
current = "to"
case "=":
// Ignore
default:
switch current {
case "from":
movedBlock.From = s.TokenText()
case "to":
movedBlock.To = s.TokenText()
default:
return false, nil, fmt.Errorf("unexpected token: " + s.TokenText())
}
}
}
return false, nil, nil
}