Slide 1
Slide 1 text
4XJGU4ZOUBYͰ
ศརΛ࣮ݱ͢Δجૅ
Kuniwak - DeNA Co.,Ltd.
2019.03.22 try! Swift Tokyo 2019
Slide 2
Slide 2 text
2
Some code will be presented in the slides,
you can see the slides and the code here:
ൃදதʹίʔυ͕ग़͖ͯ·͕͢ɺಡΈͮΒ͍߹
ҎԼ͔ΒεϥΠυΛ͝ཡ͍ͩ͘͞ɿ
speakerdeck.com/orgachem
Slide 3
Slide 3 text
"CPVUNF
Slide 4
Slide 4 text
,VOJXBL
w ॴଐˠ
• github.com/Kuniwak
• qiita.com/Kuniwak
w ߏจղੳ୯ମςετ͕
w "QQ$PEF͍
4
Slide 5
Slide 5 text
ؒͰ͍͑ͨ͜ͱ
Slide 6
Slide 6 text
4XJGU4ZOUBYΛ͏ͱɺ4XJGUͷ
੩తݕࠪίʔυੜΛ؆୯ʹͰ͖Δʂ
6
Slide 7
Slide 7 text
4XJGU4ZOUBYͱ
Slide 8
Slide 8 text
4XJGU4ZOUBY4XJGUͷެࣜϥΠϒϥϦ
github.com/apple/swift-syntax
8
Slide 9
Slide 9 text
4XJGU4ZOUBYͰ
Ͱ͖Δ͜ͱ
Slide 10
Slide 10 text
ಡΈॻ͖͍͢͠σʔλ
ίʔυΛɺಡΈॻ͖͍͢͠σʔλʹ͢Δ
ಡΈॻ͖͍͢͠σʔλΛɺίʔυʹ͢Δ
4XJGUͷίʔυ
ಡΈॻ͖͍͢͠σʔλ 4XJGUͷίʔυ
10
Slide 11
Slide 11 text
ಡΈॻ͖͍͢͠σʔλ
ίʔυΛɺಡΈॻ͖͍͢͠σʔλʹ͢Δ
ಡΈॻ͖͍͢͠σʔλΛɺίʔυʹ͢Δ
4XJGUͷίʔυ
ಡΈॻ͖͍͢͠σʔλ 4XJGUͷίʔυ
11
Slide 12
Slide 12 text
ίʔυΛɺಡΈॻ͖͍͢͠σʔλʹ͢Δ
if let self = self {}
12
આ໌ʹ͏αϯϓϧίʔυ
Slide 13
Slide 13 text
ίʔυΛɺಡΈॻ͖͍͢͠σʔλʹ͢Δ
if let self = self {}
JGจ
13
͜ΕʮJGจʯͱݺΕΔ
Slide 14
Slide 14 text
ίʔυΛɺಡΈॻ͖͍͢͠σʔλʹ͢Δ
if let self = self {}
if let self = self {}
JGจ
ෳจ
݅
14
JGจʮ݅ʯͱʮෳจʯͰ
ߏ͞Ε͍ͯΔ
Slide 15
Slide 15 text
ίʔυΛɺಡΈॻ͖͍͢͠σʔλʹ͢Δ
if let self = self {}
if let self = self {}
JGจ
ෳจ
0QUJPOଋറ݅
15
ࠓճͷ݅෦ʹɺ
ʮ0QUJPOଋറ݅ʯͱ
ݺΕ͍ͯΔͷ͕ೖΔ
Slide 16
Slide 16 text
ίʔυΛɺಡΈॻ͖͍͢͠σʔλʹ͢Δ
if let self = self {}
if let self = self {}
JGจ
ෳจ
0QUJPOଋറ݅
มࣜ
มύλʔϯ
if let self = self {}
16
0QUJPOଋറ݅ɺೖઌͷ
ʮมύλʔϯʯͱೖ͢Δͷ
ʮมࣜʯͰߏ͞Ε͍ͯΔ
Slide 17
Slide 17 text
ίʔυΛɺಡΈॻ͖͍͢͠σʔλʹ͢Δ
if let self = self {}
if let self = self {}
if let self = self {}
17
͜ͷΑ͏ʹɺίʔυΛղͯ͠
ߏཁૉΛḷ͍ͬͯ͘ͱɺ
ίʔυΛʮߏʯͱͯ͠
ѻ͍ͬͯΔ͜ͱʹؾͮ͘
Slide 18
Slide 18 text
ίʔυΛɺಡΈॻ͖͍͢͠σʔλʹ͢Δ
if let self = self {}
if let self = self {}
if let self = self {}
18
ෳจ
JGจ
ෳจ
มύλʔϯ มࣜ
0QUJPOଋറ݅
Slide 19
Slide 19 text
ίʔυΛɺಡΈॻ͖͍͢͠σʔλʹ͢Δ
if let self = self {}
if let self = self {}
JGจ
ෳจ
0QUJPOଋറ
มࣜ
มύλʔϯ
if let self = self {}
JGจ
ෳจ
มύλʔϯ มࣜ
͜ΕΛʮߏจʯͱΑͿ
19
0QUJPOଋറ݅
Slide 20
Slide 20 text
4XJGU4ZOUBYͰ
ʮߏจʯΛಡΉ
Slide 21
Slide 21 text
4XJGU4ZUOBYͰߏจΛಡΉ
if let self = self {}
if let self = self {}
JGจ
ෳจ
0QUJPOଋറ
มࣜ
มύλʔϯ
if let self = self {}
ม໊ΛಡΜͰΈΑ͏
21
Slide 22
Slide 22 text
import SwiftSyntax
let url = URL(fileURLWithPath: "example.swift")
let source = try String(contentsOf: url)
let syntax = try SyntaxParser.parse(source: source)
4XJGU4ZOUBYͰ
ಡΈॻ͖͍͢͠σʔλʢߏจʣʹ͢Δ
4XJGUͷίʔυΛ
22
Slide 23
Slide 23 text
if let self = self {}
if let self = self {}
JGจ
ෳจ
0QUJPOଋറ
มࣜ
มύλʔϯ
if let self = self {}
ifStmt
4XJGU4ZUOBYͰߏจΛಡΉ
JGจ·ͰͷऔΓํ
গ͠໘ͳͷͰޙड़
23
Slide 24
Slide 24 text
if let self = self {}
if let self = self {}
JGจ
ෳจ
0QUJPOଋറ
มࣜ
มύλʔϯ
if let self = self {}
ifStmt
.conditions[0]
.condition
4XJGU4ZUOBYͰߏจΛಡΉ
24
Slide 25
Slide 25 text
if let self = self {}
if let self = self {}
JGจ
ෳจ
0QUJPOଋറ
มࣜ
มύλʔϯ
if let self = self {}
"self"
ifStmt
.conditions[0]
.condition
.pattern
.identifier
.text
4XJGU4ZUOBYͰߏจΛಡΉ
25
Slide 26
Slide 26 text
let name = ifStmt
.conditions[0]
.condition
.pattern
.identifier
.text
if name == "this" {
print("Oops!")
}
ྫ͑ɺif let self = ͷม໊͕
౷Ұ͞Ε͍ͯͳ͍߹ʹܯࠂͰ͖Δ
ߏจΛಡΊΕɺΦϨΦϨ4XJGU-JOU͕ॻ͚Δ
26
Slide 27
Slide 27 text
import SwiftSyntax
let url = URL(fileURLWithPath: "example.swift")
let source = try String(contentsOf: url)
let syntax = try SyntaxParser.parse(source: source)
let stmts = Array(syntax.statements)
guard let ifStmt = stmts.first?.item as? IfStmtSyntax else {
print("If statement not found at the position.")
return
}
JGจগ͠ख͕ؒͩ͜ͷΑ͏ʹऔΕΔɻ࣮ࡍͷߏจΛEVNQ͢ΔͱΘ͔Δ
JGจ·ͰͷऔΓํ
27
ൃ
ද
Ͱ
ল
ུ
Slide 28
Slide 28 text
ಡΈॻ͖͍͢͠ߏจ
ίʔυΛɺಡΈॻ͖͍͢͠ߏจʹ͢Δ
ಡΈॻ͖͍͢͠ߏจΛɺίʔυʹ͢Δ
4XJGUͷίʔυ
ಡΈॻ͖͍͢͠σʔλ 4XJGUͷίʔυ
DONE
28
Slide 29
Slide 29 text
ίʔυΛɺಡΈॻ͖͍͢͠σʔλʹ͢Δ
ಡΈॻ͖͍͢͠ߏจΛɺίʔυʹ͢Δ
4XJGUͷίʔυ
4XJGUͷίʔυ
ಡΈॻ͖͍͢͠ߏจ
ಡΈॻ͖͍͢͠ߏจ
DONE
29
Slide 30
Slide 30 text
if let this = self {}
4XJGU4ZUOBYͰमਖ਼ͨ͠ίʔυΛੜ͢Δ
if let self = self {}
30
Slide 31
Slide 31 text
import SwiftSyntax
class RenameRewriter: SyntaxRewriter {
override func visit(_ node: IdentifierPatternSyntax) -> PatternSyntax {
if node.identifier.text == "this" {
var modifiedNode = node
modifiedNode.identifier = SyntaxFactory
.makeIdentifier("self")
return modifiedNode
}
return node
}
}
let syntax = try SyntaxParser.parse(source: String(contentsOf: url))
print(RenameRewriter().visit(syntax))
31
Slide 32
Slide 32 text
import SwiftSyntax
class RenameRewriter: SyntaxRewriter {
override func visit(_ node: IdentifierPatternSyntax) -> PatternSyntax {
if node.identifier.text == "this" {
var modifiedNode = node
modifiedNode.identifier = SyntaxFactory
.makeIdentifier("self")
return modifiedNode
}
return node
}
}
let syntax = try SyntaxParser.parse(source: String(contentsOf: url))
print(RenameRewriter().visit(syntax))
4XJGU4ZOUBYΛ͏
32
Slide 33
Slide 33 text
import SwiftSyntax
class RenameRewriter: SyntaxRewriter {
override func visit(_ node: IdentifierPatternSyntax) -> PatternSyntax {
if node.identifier.text == "this" {
var modifiedNode = node
modifiedNode.identifier = SyntaxFactory
.makeIdentifier("self")
return modifiedNode
}
return node
}
}
let syntax = try SyntaxParser.parse(source: String(contentsOf: url))
print(RenameRewriter().visit(syntax))
4XJGU4ZOUBYͰಡΈॻ͖͍͢͠ߏจʹ͢Δ
33
Slide 34
Slide 34 text
import SwiftSyntax
class RenameRewriter: SyntaxRewriter {
override func visit(_ node: IdentifierPatternSyntax) -> PatternSyntax {
if node.identifier.text == "this" {
var modifiedNode = node
modifiedNode.identifier = SyntaxFactory
.makeIdentifier("self")
return modifiedNode
}
return node
}
}
let syntax = try SyntaxParser.parse(source: String(contentsOf: url))
print(RenameRewriter().visit(syntax))
ߏจΛॻ͖͑ͯɺ݁ՌΛදࣔ͢Δ
34
Slide 35
Slide 35 text
import SwiftSyntax
class RenameRewriter: SyntaxRewriter {
override func visit(_ node: IdentifierPatternSyntax) -> PatternSyntax {
if node.identifier.text == "this" {
var modifiedNode = node
modifiedNode.identifier = SyntaxFactory
.makeIdentifier("self")
return modifiedNode
}
return node
}
}
let syntax = try SyntaxParser.parse(source: String(contentsOf: url))
print(RenameRewriter().visit(syntax))
ߏจΛॻ͖͑ΔͨΊͷΫϥε
35
Slide 36
Slide 36 text
import SwiftSyntax
class RenameRewriter: SyntaxRewriter {
override func visit(_ node: IdentifierPatternSyntax) -> PatternSyntax {
if node.identifier.text == "this" {
var modifiedNode = node
modifiedNode.identifier = SyntaxFactory
.makeIdentifier("self")
return modifiedNode
}
return node
}
}
let syntax = try SyntaxParser.parse(source: String(contentsOf: url))
print(RenameRewriter().visit(syntax))
ॻ͖͍͑ͨߏจͷWJTJUؔΛPWFSSJEF͢Δ
ࠓճJGMFU9ͷ9෦͕ର
ʢܕͷ໊લEVNQͰௐΔͱΘ͔Δʣ
36
Slide 37
Slide 37 text
import SwiftSyntax
class RenameRewriter: SyntaxRewriter {
override func visit(_ node: IdentifierPatternSyntax) -> PatternSyntax {
if node.identifier.text == "this" {
var modifiedNode = node
modifiedNode.identifier = SyntaxFactory
.makeIdentifier("self")
return modifiedNode
}
return node
}
}
let syntax = try SyntaxParser.parse(source: String(contentsOf: url))
print(RenameRewriter().visit(syntax))
JGMFU9ͷ9෦͕UIJTͳΒॻ͖͑Δ
37
Slide 38
Slide 38 text
import SwiftSyntax
class RenameRewriter: SyntaxRewriter {
override func visit(_ node: IdentifierPatternSyntax) -> PatternSyntax {
if node.identifier.text == "this" {
var modifiedNode = node
modifiedNode.identifier = SyntaxFactory
.makeIdentifier("self")
return modifiedNode
}
return node
}
}
let syntax = try SyntaxParser.parse(source: String(contentsOf: url))
print(RenameRewriter().visit(syntax))
9෦ΛTFMGʹॻ͖͑Δ
38
Slide 39
Slide 39 text
import SwiftSyntax
class RenameRewriter: SyntaxRewriter {
override func visit(_ node: IdentifierPatternSyntax) -> PatternSyntax {
if node.identifier.text == "this" {
var modifiedNode = node
modifiedNode.identifier = SyntaxFactory
.makeIdentifier("self")
return modifiedNode
}
return node
}
}
let syntax = try SyntaxParser.parse(source: String(contentsOf: url))
print(RenameRewriter().visit(syntax))
39
Slide 40
Slide 40 text
import SwiftSyntax
class RenameRewriter: SyntaxRewriter {
override func visit(_ node: IdentifierPatternSyntax) -> PatternSyntax {
if node.identifier.text == "this" {
var modifiedNode = node
modifiedNode.identifier = SyntaxFactory
.makeIdentifier("self")
return modifiedNode
}
return node
}
}
let syntax = try SyntaxParser.parse(source: String(contentsOf: url))
print(RenameRewriter().visit(syntax)) "if let self= self {}"
40
ίʔυΛੜͰ͖ͨʂ
Slide 41
Slide 41 text
import SwiftSyntax
class RenameRewriter: SyntaxRewriter {
override func visit(_ node: IdentifierPatternSyntax) -> PatternSyntax {
if node.identifier.text == "this" {
var modifiedNode = node
modifiedNode.identifier = SyntaxFactory
.makeIdentifier("self")
return modifiedNode
}
return node
}
}
let syntax = try SyntaxParser.parse(source: String(contentsOf: url))
print(RenameRewriter().visit(syntax)) "if let self= self {}"
41
Α͘ݟΔͱۭന͕
ফ͑ͯ͠·͍ͬͯΔ
Slide 42
Slide 42 text
import SwiftSyntax
class RenameRewriter: SyntaxRewriter {
override func visit(_ node: IdentifierPatternSyntax) -> PatternSyntax {
if node.identifier.text == "this" {
var modifiedNode = node
let originalIdentifier = node.identifier
modifiedNode.identifier = SyntaxFactory
.makeIdentifier("self")
.withTrailingTrivia(originalIdentifier.trailingTrivia)
return modifiedNode
}
return node
}
}
let syntax = try SyntaxParser.parse(source: String(contentsOf: url))
print(RenameRewriter().visit(syntax))
TFMGޙͷۭന͕ͳ͘ͳΔ5SJWJBͰௐͰ͖Δ
ൃ
ද
Ͱ
ল
ུ
42
Slide 43
Slide 43 text
if let this = self {}
4XJGU4ZUOBYͰमਖ਼ͨ͠ίʔυΛੜ͢Δ
if let self = self {}
43
DONE
Slide 44
Slide 44 text
ίʔυΛɺಡΈॻ͖͍͢͠ߏจʹ͢Δ
ಡΈॻ͖͍͢͠ߏจΛɺίʔυʹ͢Δ
4XJGUͷίʔυ
4XJGUͷίʔυ
ಡΈॻ͖͍͢͠ߏจ
ಡΈॻ͖͍͢͠ߏจ
DONE
44
DONE
Slide 45
Slide 45 text
4XJGU4ZOUBYΛ͏ͱɺ
4XJGUͷߏจͷݕࠪ
मਖ਼ͨ͠ίʔυΛੜͰ͖ͨʂ
·ͱΊ
45