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੩తݕࠪͷ͍Ζ
ࣄલࣝͳ͠Ͱཧղ͢Δ
Kuniwak - DeNA Co.,Ltd.
2018.09.07 builderscon tokyo 2018
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"CPVUNF
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,VOJXBL
w ॴଐˠ
w HJUIVCDPN,VOJXBL
w RJJUBDPN,VOJXBL
w ίϯϐϡʔλαΠΤϯεΛ
ֶΜͰ͖͍ͯ·ͤΜ
w ࣄલࣝͳ͠Ͱ੩తղੳ
πʔϧΛ։ൃ͖ͯͨ͠
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͜Ε·Ͱʹ͖ͭͬͯͨ͘
੩తݕࠪܥͷπʔϧͷհ
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7JNTDSJQUͷ੩తݕࠪπʔϧ
https://github.com/Kuniwak/Vint
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$44ͷมߋΛՄࢹԽ͢Δπʔϧ
https://github.com/mixi-inc/css-semdiff
$ css-astdiff a.css b.css --verbose
extra:
.extra-1 {
border: none;
}
missing:
.missing-1 {
border: none;
}
---------------------------------
1 extra rules and 1 missing rules
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मਖ਼ͷӨڹൣғΛڭ͑ͯ͘ΕΔπʔϧ
https://twitter.com/orga_chem/status/674847225684475905
˞લ৬
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͜ͷൃදΛฉ͘ͱ
Θ͔Δ͜ͱ
͡Ίʹ
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੩తղੳΛߏ͢Δ͍͔ͭ͘ͷߟ͑ํ
͕Θ͔ΔΑ͏ʹͳΔ
ߟ͑ํ͑͞ཧղͰ͖Εɺ੩తղੳΛ
࣮͢Δͷ͘͠ͳ͍͜ͱ͕Θ͔Δ
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͏ͪΐͬͱ۩ମతʹ
͜ͷൃදͷඪ
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if isEmpty('') {
//CATCH_ME_IF_YOU_CAN
}
CATCH_ME_IF_YOU_CANͱॻ͔Εͨੜҙؾͳ
ίϝϯτʢจࣈྻͷ/(ʣΛݕ͢Δ
੩తݕࠪΛ៉ྷʹ࣮Ͱ͖ΔΑ͏ʹͳΔ
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؆୯͗͢ͳ͍ʁͱ
ࢥͬͨ͋ͳͨ
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ಉ͡ϓϩάϥϜͰ࣍ͷίʔυ
ղੳͰ͖·͔͢ʁ
fake('', ' //CATCH_ME_IF_YOU_CAN ↩︎
')
͜ΕจࣈྻͳͷͰݕ͍͚ͯ͠ͳ͍
͜ͷվߦҙਤతͰ͢
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͜ͷൃදͰɺҙѱͳέʔεʹ
ରԠͰ͖Δ੩తղੳΛઆ໌͠·͢
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੩తղੳͱ
Ͱͬͦ͘͞
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੩తݕࠪͱɺݕ͍ࠪͨ͠ϓϩάϥϜΛ
࣮ߦ͠ͳ͍··֤छͷҟৗΛݕࠪ͢Δख๏ͷ͜ͱ
ݴޠ͝ͱʹ༷ʑͳ੩తݕࠪͷͨΊͷπʔϧ͕͋Δɿ
w 1ZUIPOͳΒ1ZqBLFTNZQZͳͲ
w 3VCZͳΒ3VCPDPQͳͲ
w +BWB4DSJQUͳΒ&4-JOUͳͲ
w +BWBͳΒ4QPU#VHTͳͲ
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͜͜Ͱٙ
ͳͥ੩తʹݕ͍ࠪͨ͠ͷ͔
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ݕ͍ࠪͨ͠ϓϩάϥϜΛ࣮ߦͯ͠ʢಈతʣ
ݕࠪ͢Δ߹ɺݕࠪதʹ௨ա͍ͯ͠ͳ͍
ίʔυݕࠪͰ͖ͳ͍
isFoo = true
if isFoo {
}
else {
}
ͪ͜ΒಈతʹݕࠪͰ͖Δ
ͪ͜ΒಈతʹݕࠪͰ͖ͳ͍
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੩తݕࠪಈతݕ͕ࠪۤखͳ
ཏతͳݕ͕ࠪಘҙ
͔͠͠੩తݕࠪಈతݕࠪ΄Ͳ
ݕࠪ݁Ռ͕ਖ਼֬ʹͳΒͳ͍
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੩తݕࠪΛΔ͜ͱͰ
։ൃΛޮԽͰ͖Δཧ༝
ͳΜͷʹཱͭͷ͔ٙͳ͋ͳͨ
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ίʔυϨϏϡʔͷҰ෦Λ
ࣗಈԽͰ͖ΔΑ͏ʹͳΔ
ศརͳࣾπʔϧΛͭͬͯ͘
͋Γ͕͕ͨΒΕΔ
طଘͷ੩తղੳπʔϧΛվྑɾ
σόοάͰ͖ΔΑ͏ʹͳΔ
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ίʔυϨϏϡʔࣗಈԽͷྫ
http://alpha.mixi.co.jp/entry/2015/12/20/000000
$ css-astdiff a.css b.css --verbose
extra:
.extra-1 {
border: none;
}
missing:
.missing-1 {
border: none;
}
---------------------------------
1 extra rules and 1 missing rules
ߦͷ$44Λ
োθϩͰ-FTT
Ҡߦͨ͠ࡍͷπʔϧ
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ศརͳࣾπʔϧʢʁʣͷྫ
https://twitter.com/orga_chem/status/674847225684475905
ऍ໌
WJTVBMJ[BUJPOఘΊ·͕ͨ͠ɺ
ґଘΛҰཡͰݟΒΕΔαʔϏε
ͭͬͨ͘ΒศརʹΘΕ·ͨ͠
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શମతͳઆ໌ͷྲྀΕ
͜Ε͔Βͷ
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֓೦Λཧղ͢Δ
நߏจΛཧղ͢Δ
நߏจͷ࡞ΓํΛཧղ͢Δ
நߏจͷѻ͍ํΛཧղ͢Δ
࡞ΓํΛཧղ͢Δ
؆୯ͳ੩తղੳΛ࣮͢Δ
੩తղੳͷσβΠϯύλʔϯΛΔ
࣮ࡍͷ੩తղੳΛಡΉ
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நߏจΛཧղ͢Δ
·ͣ
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੩తݕࠪͰऔΓѻ͏දతͳ
σʔλͷछྨ͍͔ͭ͋͘Δ
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நߏจ
ίʔυΛߏͰදݱͨ͠ͷ
ଟ͘ͷ੩తղੳͷجຊ
τʔΫϯྻ
ίʔυͷখ͞ͳߏ୯ҐΛ
ग़ݱॱʹฒͨͷ
ελΠϧʹؔ͢Δ੩తղੳͰ
Α͘ΘΕΔ
੍ޚϑϩʔάϥϑ
ίʔυͷ݅ذͳͲͷ
੍ޚߏΛ࿈݁ͨ͠ϒϩοΫͰ
දݱͨ͠ͷ
ίʔϧάϥϑ
ؔͷݺͼग़ؔ͠ΛάϥϑͰ
දݱͨ͠ͷ
ະ༻ؔͷղੳͳͲʹΑ͘
ΘΕΔ
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τʔΫϯྻ
ίʔυͷখ͞ͳߏ୯ҐΛ
ग़ݱॱʹฒͨͷ
ελΠϧʹؔ͢Δ੩తղੳͰ
Α͘ΘΕΔ
੍ޚϑϩʔάϥϑ
ίʔυͷ݅ذͳͲͷ
੍ޚߏΛ࿈݁ͨ͠ϒϩοΫͰ
දݱͨ͠ͷ
ίʔϧάϥϑ
ؔͷݺͼग़ؔ͠ΛάϥϑͰ
දݱͨ͠ͷ
ະ༻ؔͷղੳͳͲʹΑ͘
ΘΕΔ
நߏจ
ίʔυΛߏͰදݱͨ͠ͷ
ଟ͘ͷ੩తղੳͷجຊ ࠓճղઆ͢Δͷ
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if isEmpty('') {
// COMMENT
}
1SPHSBN
*G4UBUFNFOU
4USJOH-JUFSBM
'VOD$BMM
*EFOUJpFS
$PNNFOU
நߏจ
ίʔυ
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if isEmpty('') {
// COMMENT
}
நߏจ
ίʔυ
˞4UBUFNFOUʮจʯͷҙຯͳͷͰɺ*G4UBUFNFOUʮJGจʯͷҙຯͰ͢
1SPHSBN
4USJOH-JUFSBM
'VOD$BMM
*EFOUJpFS
$PNNFOU
*G4UBUFNFOU
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if isEmpty('') {
// COMMENT
}
1SPHSBN
*G4UBUFNFOU
4USJOH-JUFSBM
*EFOUJpFS
$PNNFOU
'VOD$BMM
நߏจ
ίʔυ
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if isEmpty('') {
// COMMENT
}
1SPHSBN
*G4UBUFNFOU
4USJOH-JUFSBM
'VOD$BMM $PNNFOU
*EFOUJpFS
நߏจ
ίʔυ
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if isEmpty('') {
// COMMENT
}
1SPHSBN
*G4UBUFNFOU
'VOD$BMM
*EFOUJpFS
$PNNFOU
4USJOH-JUFSBM
நߏจ
ίʔυ
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if isEmpty('') {
// COMMENT
}
1SPHSBN
*G4UBUFNFOU
4USJOH-JUFSBM
'VOD$BMM
*EFOUJpFS
$PNNFOU
நߏจ
ίʔυ
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if isEmpty('') {
// COMMENT
}
நߏจ
*G4UBUFNFOU
4USJOH-JUFSBM
'VOD$BMM
*EFOUJpFS
$PNNFOU
1SPHSBN
ίʔυ
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if isEmpty('') {
// COMMENT
}
1SPHSBN
*G4UBUFNFOU
4USJOH-JUFSBM
'VOD$BMM
*EFOUJpFS
$PNNFOU
நߏจ
ίʔυ
நߏจɺίʔυͷߏΛ
ߏͷσʔλͱͯ͠දݱͨ͠ͷ
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ߏͰ1SPHSBN
$PNNFOUͷΑ͏ͳ
Λߏ͢Δઅͷ͜ͱΛ
ʮϊʔυʯͱݺͿ
1SPHSBN
*G4UBUFNFOU
4USJOH-JUFSBM
'VOD$BMM
*EFOUJpFS
$PNNFOU
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࣮ࡍͷϝδϟʔͳݴޠͷ
நߏจΛݟͯΈΑ͏
நߏจͳΜͱͳ͘Θ͔ͬͨͷͰ
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ϝδϟʔͳݴޠͷநߏจ
ҙ֎ͱ؆୯ʹΈΒΕΔ
ݴޠʹΑͬͯඪ४ϥΠϒϥϦ͚ͩͰ
நߏจΛΈΒΕͨΓ͢Δ
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1ZUIPOͷநߏจͷݟํ
import ast
source = "if is_empty(''):\n" \
" pass\n"
node = ast.parse(source, "sample.py")
print(ast.dump(node))
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if is_empty(''):
pass
நߏจ
1ZUIPO
Module(
body=[
If(
test=Call(
func=Name(
id='is_empty',
ctx=Load()
),
args=[
Str(s='')
],
keywords=[]
),
body=[
Pass()
],
orelse=[]
)
]
)
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if is_empty(''):
pass
நߏจ
1ZUIPO
Module(
body=[
If(
test=Call(
func=Name(
id='is_empty',
ctx=Load()
),
args=[
Str(s='')
],
keywords=[]
),
body=[
Pass()
],
orelse=[]
)
]
)
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if is_empty(''):
pass
நߏจ
1ZUIPO
Module(
body=[
If(
test=Call(
func=Name(
id='is_empty',
ctx=Load()
),
args=[
Str(s='')
],
keywords=[]
),
body=[
Pass()
],
orelse=[]
)
]
)
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if is_empty(''):
pass
நߏจ
1ZUIPO
Module(
body=[
If(
test=Call(
func=Name(
id='is_empty',
ctx=Load()
),
args=[
Str(s='')
],
keywords=[]
),
body=[
Pass()
],
orelse=[]
)
]
)
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if is_empty(''):
pass
நߏจ
1ZUIPO
Module(
body=[
If(
test=Call(
func=Name(
id='is_empty',
ctx=Load()
),
args=[
Str(s='')
],
keywords=[]
),
body=[
Pass()
],
orelse=[]
)
]
)
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if is_empty(''):
pass
நߏจ
1ZUIPO
Module(
body=[
If(
test=Call(
func=Name(
id='is_empty',
ctx=Load()
),
args=[
Str(s='')
],
keywords=[]
),
body=[
Pass()
],
orelse=[]
)
]
)
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3VCZͷநߏจͷݟํ
require 'ripper'
require 'pp'
example = <<~END
if is_empty('')
end
END
pp Ripper.sexp(example)
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நߏจ
3VCZ
[:program,
[
[:if,
[:method_add_arg,
[:fcall,
[:@ident,
"is_empty",
[1, 3]
]
],
[:arg_paren,
[:args_add_block,
[[:string_literal, [:string_content]]],
false
]
]
],
[[:void_stmt]],
nil
]
]
]
if is_empty('')
end
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[:program,
[
[:if,
[:method_add_arg,
[:fcall,
[:@ident,
"is_empty",
[1, 3]
]
],
[:arg_paren,
[:args_add_block,
[[:string_literal, [:string_content]]],
false
]
]
],
[[:void_stmt]],
nil
]
]
]
நߏจ
3VCZ
if is_empty('')
end
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[:program,
[
[:if,
[:method_add_arg,
[:fcall,
[:@ident,
"is_empty",
[1, 3]
]
],
[:arg_paren,
[:args_add_block,
[[:string_literal, [:string_content]]],
false
]
]
],
[[:void_stmt]],
nil
]
]
]
நߏจ
3VCZ
if is_empty('')
end
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[:program,
[
[:if,
[:method_add_arg,
[:fcall,
[:@ident,
"is_empty",
[1, 3]
]
],
[:arg_paren,
[:args_add_block,
[[:string_literal, [:string_content]]],
false
]
]
],
[[:void_stmt]],
nil
]
]
]
நߏจ
3VCZ
if is_empty('')
end
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[:program,
[
[:if,
[:method_add_arg,
[:fcall,
[:@ident,
"is_empty",
[1, 3]
]
],
[:arg_paren,
[:args_add_block,
[[:string_literal, [:string_content]]],
false
]
]
],
[[:void_stmt]],
nil
]
]
]
நߏจ
3VCZ
if is_empty('')
end
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+BWB4DSJQUͷநߏจͷݟํ
import {default as Esprima} from "esprima";
const program = "if (isEmpty('')) {\n"
+ "}\n";
const node = Esprima.parseScript(program);
console.log("%j", node);
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நߏจ
+BWB4DSJQU
{
"type": "Program",
"body": [
{
"type": "IfStatement",
"test": {
"type": "CallExpression",
"callee": {
"type": "Identifier",
"name": "isEmpty"
},
"arguments": [
{
"type": "Literal",
"value": "",
"raw": "''"
}
]
},
"consequent": {
"type": "BlockStatement",
"body": []
},
"alternate": null
}
],
"sourceType": "script"
}
if (isEmpty('')) {
}
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நߏจ
+BWB4DSJQU
{
"type": "Program",
"body": [
{
"type": "IfStatement",
"test": {
"type": "CallExpression",
"callee": {
"type": "Identifier",
"name": "isEmpty"
},
"arguments": [
{
"type": "Literal",
"value": "",
"raw": "''"
}
]
},
"consequent": {
"type": "BlockStatement",
"body": []
},
"alternate": null
}
],
"sourceType": "script"
}
if (isEmpty('')) {
}
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நߏจ
+BWB4DSJQU
if (isEmpty('')) {
}
{
"type": "Program",
"body": [
{
"type": "IfStatement",
"test": {
"type": "CallExpression",
"callee": {
"type": "Identifier",
"name": "isEmpty"
},
"arguments": [
{
"type": "Literal",
"value": "",
"raw": "''"
}
]
},
"consequent": {
"type": "BlockStatement",
"body": []
},
"alternate": null
}
],
"sourceType": "script"
}
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நߏจ
+BWB4DSJQU
if (isEmpty('')) {
}
{
"type": "Program",
"body": [
{
"type": "IfStatement",
"test": {
"type": "CallExpression",
"callee": {
"type": "Identifier",
"name": "isEmpty"
},
"arguments": [
{
"type": "Literal",
"value": "",
"raw": "''"
}
]
},
"consequent": {
"type": "BlockStatement",
"body": []
},
"alternate": null
}
],
"sourceType": "script"
}
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நߏจ
+BWB4DSJQU
{
"type": "Program",
"body": [
{
"type": "IfStatement",
"test": {
"type": "CallExpression",
"callee": {
"type": "Identifier",
"name": "isEmpty"
},
"arguments": [
{
"type": "Literal",
"value": "",
"raw": "''"
}
]
},
"consequent": {
"type": "BlockStatement",
"body": []
},
"alternate": null
}
],
"sourceType": "script"
}
if (isEmpty('')) {
}
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நߏจͷ·ͱΊ
w நߏจϓϩάϥϜΛߏͰදݱͨ͠ͷ
w ଟ͘ͷ੩తղੳʹநߏจ͕ొ͢Δ
w ϝδϟʔͳݴޠͰ͋Ε؆୯ʹΈΒΕΔ
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நߏจΛͭ͘Δ
ߏจղੳΛΖ͏
நߏจΛશʹཧղͨ͠ͷͰ
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ϓϩάϥϜͷςΩετ͔ΒநߏจΛ
࡞͢ΔॲཧΛߏจղੳͱݺͿ
ߏจղੳΛΔͱɺطଘͷߏจղੳ
ϥΠϒϥϦΛ͏ͱ͖ͷҙ͕Θ͔Δ
ͨͱ͑ɺੑೳྼԽ͍͢͠෦ͳͲ͕Θ͔Δ
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ߏจղੳͷදత࣮ख๏
w ࠶ؼԼ߱๏
w όοΫτϥοΫ͋Γ
w ૉͳ࣮
w 1BSTFS$PNCJOBUPS
w 1BSTFS&YQSFTTJPO(SBNNBS
w όοΫτϥοΫͳ͠
w ʜ
w ԋࢉࢠॱҐ๏
w ʜ
ࠓճղઆ͢Δ࣮
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ͪΌΜͱͨ͠ఆٛ͘͠ฉ͑͜Δ͕ɺ
࣮ࡍͷίʔυΛΈΕ͙͢ʹཧղͰ͖Δ
श͏ΑΓ׳ΕΑ͏
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จ๏نଇͷհ
ࠓ͔ΒߏจղੳΛ࣮͢Δ
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<ϓϩάϥϜ> := <จ>* EOF
<จ> := | <ࣜจ> | <ίϝϯτจ>
:= "if " <ࣜ> " {\n" <จ>* "}" "\n"
<ࣜจ> := <ࣜ> "\n"
<ίϝϯτจ> := "//" [A-Z_ ]* "\n"
<ࣜ> := <จࣈྻϦςϥϧ> | <ؔݺͼग़ࣜ͠>
<จࣈྻϦςϥϧ> := "'" ("\'" | [A-Z_ ])* "'"
<ؔݺͼग़ࣜ͠> := <໊ؔ> "(" <ࣜ> ")"
<໊ؔ> := [a-z] [a-z]*
͜ͷ··ͩͱΘ͔ΓͮΒ͍ͷͰɺ۩ମྫΛग़͠·͢
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ίϝϯτ͚ͩϓϩάϥϜ
// COMMENT ↩︎
EOF
&0'ϑΝΠϧͷऴྃʢ&OEPG'JMFʣΛҙຯ͢Δه߸
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<ϓϩάϥϜ> := <จ>* EOF
<จ> := | <ࣜจ> | <ίϝϯτจ>
<ίϝϯτจ> := "//" [A-Z_ ]* "\n"
ίϝϯτ͚ͩϓϩάϥϜ
ద༻͞Εͨจ๏نଇ
͔͜͜ΒݟΔ
// COMMENT ↩︎
EOF
Slide 69
Slide 69 text
<ϓϩάϥϜ> := <จ>* EOF
<จ> := | <ࣜจ> | <ίϝϯτจ>
<ίϝϯτจ> := "//" [A-Z_ ]* "\n"
ίϝϯτ͚ͩϓϩάϥϜ
ద༻͞Εͨจ๏نଇ
จͷ܁Γฦ͠ʹଓ͍ͯ&0'͕͘Δ
// COMMENT ↩︎
EOF
Slide 70
Slide 70 text
<ϓϩάϥϜ> := <จ>* EOF
<จ> := | <ࣜจ> | <ίϝϯτจ>
<ίϝϯτจ> := "//" [A-Z_ ]* "\n"
ίϝϯτ͚ͩϓϩάϥϜ
ద༻͞Εͨจ๏نଇ
จͷதΛݟʹ͍͘
// COMMENT ↩︎
EOF
Slide 71
Slide 71 text
<ϓϩάϥϜ> := <จ>* EOF
<จ> := | <ࣜจ> | <ίϝϯτจ>
<ίϝϯτจ> := "//" [A-Z_ ]* "\n"
ίϝϯτ͚ͩϓϩάϥϜ
ద༻͞Εͨจ๏نଇ
จ͜ͷ͏ͪͷͲΕ͔ͭ
// COMMENT ↩︎
EOF
Slide 72
Slide 72 text
<ϓϩάϥϜ> := <จ>* EOF
<จ> := | <ࣜจ> | <ίϝϯτจ>
<ίϝϯτจ> := "//" [A-Z_ ]* "\n"
ίϝϯτ͚ͩϓϩάϥϜ
ద༻͞Εͨจ๏نଇ
ࠓճͷจίϝϯτจ
// COMMENT ↩︎
EOF
Slide 73
Slide 73 text
<ϓϩάϥϜ> := <จ>* EOF
<จ> := | <ࣜจ> | <ίϝϯτจ>
<ίϝϯτจ> := "//" [A-Z_ ]* "\n"
ίϝϯτจͷதΛݟʹ͍͘
ίϝϯτ͚ͩϓϩάϥϜ
ద༻͞Εͨจ๏نଇ
// COMMENT ↩︎
EOF
Slide 74
Slide 74 text
<ϓϩάϥϜ> := <จ>* EOF
<จ> := | <ࣜจ> | <ίϝϯτจ>
<ίϝϯτจ> := "//" [A-Z_ ]* "\n"
ʹଓ͍ͯӳେจࣈͱ@ͱۭന͕Կճ͔ଓ͍ͯɺվߦͰऴΘΔ
ίϝϯτ͚ͩϓϩάϥϜ
ద༻͞Εͨจ๏نଇ
// COMMENT ↩︎
EOF
Slide 75
Slide 75 text
// COMMENT ↩︎
EOF
<ϓϩάϥϜ> := <จ>* EOF
<จ> := | <ࣜจ> | <ίϝϯτจ>
<ίϝϯτจ> := "//" [A-Z_ ]* "\n"
ίϝϯτ͚ͩϓϩάϥϜ
ద༻͞Εͨจ๏نଇ
Slide 76
Slide 76 text
// COMMENT ↩︎
EOF
<ϓϩάϥϜ> := <จ>* EOF
<จ> := | <ࣜจ> | <ίϝϯτจ>
<ίϝϯτจ> := "//" [A-Z_ ]* "\n"
ίϝϯτ͚ͩϓϩάϥϜ
ద༻͞Εͨจ๏نଇ
ίʔυͱͷରԠ͕Ͱ͖ͨΒɺݟͨॱ൪ΛٯʹḪ͍ͬͯ͘
Slide 77
Slide 77 text
// COMMENT ↩︎
EOF
<ϓϩάϥϜ> := <จ>* EOF
<จ> := | <ࣜจ> | <ίϝϯτจ>
<ίϝϯτจ> := "//" [A-Z_ ]* "\n"
จίϝϯτจͰରԠ͕औΕͨͷͰḪΔ
ίϝϯτ͚ͩϓϩάϥϜ
ద༻͞Εͨจ๏نଇ
Slide 78
Slide 78 text
<ϓϩάϥϜ> := <จ>* EOF
<จ> := | <ࣜจ> | <ίϝϯτจ>
<ίϝϯτจ> := "//" [A-Z_ ]* "\n"
// COMMENT
EOF
ࠓճͷจճ܁Γฦ͚ͩ͠Ͱɺதίϝϯτจ
ίϝϯτ͚ͩϓϩάϥϜ
ద༻͞Εͨจ๏نଇ
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<ϓϩάϥϜ> := <จ>* EOF
<จ> := | <ࣜจ> | <ίϝϯτจ>
<ίϝϯτจ> := "//" [A-Z_ ]* "\n"
// COMMENT
EOF
࠷ޙ&0'ͰऴΘΔ
ίϝϯτ͚ͩϓϩάϥϜ
ద༻͞Εͨจ๏نଇ
Slide 80
Slide 80 text
͜͜·ͰಡΊΕɺଞͷίʔυͷ
จ๏نଇಡΊΔΑ͏ʹͳΔ
Slide 81
Slide 81 text
print("TEXT")
EOF
ؔݺͼग़͚ͩ͠ϓϩάϥϜ
ద༻͞Εͨจ๏نଇ
<ϓϩάϥϜ> := <จ>* EOF
<จ> := | <ࣜจ> | <ίϝϯτจ>
<ࣜจ> := <ࣜ> "\n"
<ࣜ> := <จࣈྻϦςϥϧ> | <ؔݺͼग़ࣜ͠>
<ؔݺͼग़͠> := <໊ؔ> "(" <ࣜ> ")"
<໊ؔ> := [a-z] [a-z]*
Slide 82
Slide 82 text
print("TEXT")
EOF
ؔݺͼग़͚ͩ͠ϓϩάϥϜ
ద༻͞Εͨจ๏نଇ
<ϓϩάϥϜ> := <จ>* EOF
<จ> := | <ࣜจ> | <ίϝϯτจ>
<ࣜจ> := <ࣜ> "\n"
<ࣜ> := <จࣈྻϦςϥϧ> | <ؔݺͼग़ࣜ͠>
<ؔݺͼग़͠> := <໊ؔ> "(" <ࣜ> ")"
<໊ؔ> := [a-z] [a-z]*
ಉ͡Α͏ʹݟ͍͖ͯ·͠ΐ͏
Slide 83
Slide 83 text
print("TEXT")
EOF
ؔݺͼग़͚ͩ͠ϓϩάϥϜ
ద༻͞Εͨจ๏نଇ
<ϓϩάϥϜ> := <จ>* EOF
<จ> := | <ࣜจ> | <ίϝϯτจ>
<ࣜจ> := <ࣜ> "\n"
<ࣜ> := <จࣈྻϦςϥϧ> | <ؔݺͼग़ࣜ͠>
<ؔݺͼग़͠> := <໊ؔ> "(" <ࣜ> ")"
<໊ؔ> := [a-z] [a-z]* <จࣈྻϦςϥϧ>
Slide 84
Slide 84 text
EOF
ۭͷϓϩάϥϜ
ద༻͞Εͨจ๏نଇ
<ϓϩάϥϜ> := <จ>* EOF
࣮͜Εจ๏نଇ্ଥͳϓϩάϥϜ
Slide 85
Slide 85 text
EOF
ۭͷϓϩάϥϜ
ద༻͞Εͨจ๏نଇ
<ϓϩάϥϜ> := <จ>* EOF
܁Γฦ͠ճ
Slide 86
Slide 86 text
ෆਖ਼ͳϓϩάϥϜΈͯΈΑ͏
Slide 87
Slide 87 text
/ INVALID
EOF
ෆਖ਼ͳϓϩάϥϜ
ద༻͞Εͨจ๏نଇ
ద༻Ͱ͖Δจ๏نଇͳ͠
Slide 88
Slide 88 text
/ INVALID
EOF
ෆਖ਼ͳϓϩάϥϜ
ద༻͞Εͨจ๏نଇ
ͳ͠
͜ͷίʔυϓϩάϥϜͷจͷ͍ͣΕʹ
͋ͯ·Βͳ͍ͷͰɺϓϩάϥϜʹ͋ͯ·Βͳ͍
͜ͷঢ়گΛʮߏจΤϥʔʢTZOUBYFSSPSʣʯͱ͍͏
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จ๏نଇ·ͱΊ
w จ๏نଇ۩ମྫΛߟ͑ΔͱΘ͔Γ͍͢
w จ๏نଇʹ͋ͯ·Βͳ͍ͱ͖ߏจΤϥʔʹͳΔ
Slide 90
Slide 90 text
ߏจղੳͷ࣮
͖ͬ͞ͷจ๏نଇʹରԠ͢Δ
Slide 91
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จ๏نଇͷࠨଆʢͷ෦ʣʹ
ରԠ͢ΔநߏจͷϊʔυΛఆٛ͢Δ
ఆٛͨ͠ϊʔυ͝ͱʹղੳؔΛ༻ҙ͢Δ
ߏจղੳͷ࣮खॱ
Slide 92
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<ϓϩάϥϜ> := <จ>* EOF
<จ> := | <ࣜจ> | <ίϝϯτจ>
:= "if " <ࣜ> " {\n" <จ>* "}" "\n"
<ࣜจ> := <ࣜ> "\n"
<ίϝϯτจ> := "//" [A-Z_ ]* "\n"
<ࣜ> := <จࣈྻϦςϥϧ> | <ؔݺͼग़ࣜ͠>
<จࣈྻϦςϥϧ> := "'" ("\'" | [A-Z_ ])* "'"
<ؔݺͼग़ࣜ͠> := <໊ؔ> "(" <ࣜ> ")"
<໊ؔ> := [a-z] [a-z]*
͜ͷ͝ͱʹநߏจͷϊʔυΛఆٛ͢Δ
Slide 93
Slide 93 text
1SPHSBN
4UBUFNFOU 4UBUFNFOU
# <ϓϩάϥϜ> := <จ>*
class ProgramNode(Node):
def __init__(self, statement_nodes):
# <ϓϩάϥϜ>ෳͷ<จ>͔ΒͳΔͷͰɺ
# ؚ·ΕΔ<จ>ΛྻͰอ࣋͢Δɻ
self.statements = statement_nodes
ϓϩάϥϜʹରԠ͢Δநߏจͷϊʔυ
จͷϊʔυͷྻ
Slide 94
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# <ϓϩάϥϜ> := <จ>*
class ProgramNode(Node):
def __init__(self, statement_nodes):
# <ϓϩάϥϜ>ෳͷ<จ>͔ΒͳΔͷͰɺ
# ؚ·ΕΔ<จ>ΛྻͰอ࣋͢Δɻ
self.statements = statement_nodes 4UBUFNFOU 4UBUFNFOU
1SPHSBN
Slide 95
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# <ϓϩάϥϜ> := <จ>*
class ProgramNode(Node):
def __init__(self, statement_nodes):
# <ϓϩάϥϜ>ෳͷ<จ>͔ΒͳΔͷͰɺ
# ؚ·ΕΔ<จ>ΛྻͰอ࣋͢Δɻ
self.statements = statement_nodes
1SPHSBN
4UBUFNFOU 4UBUFNFOU
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# := "if " <ࣜ> " {\n" จ* "}" "\n"
class IfStatementNode(Node):
def __init__(self, condition_node, then_statements):
# if ͷޙͷ݅෦ͷ <ࣜ> Λอ࣋͢Δɻ
self.condition_node = condition_node
# { ͱ } ͷؒͷෳͷ <จ> Λྻͱͯ͠อ࣋͢Δɻ
self.then_statements = then_statements
JGจʹରԠ͢Δநߏจͷϊʔυ
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ಉ༷ʹͯ͢ͷʹରԠ͢Δ
நߏจͷϊʔυΛఆٛ͠·͢
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ͯ͢ͷϊʔυΛఆٛ͠ऴΘͬͨΒɺ
͜ΕΛ࡞͢ΔؔΛॻ͍͍ͯ͘
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Slide 99 text
ʹରԠ͢ΔؔͷҾͱΓʹɺ
Α͋͘Δఆ൪ͷύλʔϯ͕͋Δ
͜ͷύλʔϯʹै͏ͱɺؔΛ
Έ߹Θͤ͘͢ͳΔͷͰ͓֮͑ͯ͜͏
Slide 100
Slide 100 text
͍͖ͳΓϓϩάϥϜʹରԠ͢ΔؔΛ
ॻ͘ͱઆ໌͕͍͠ͷͰɺίϝϯτจʹ
ରԠ͢Δ͔ؔΒઆ໌͢Δ
Slide 101
Slide 101 text
# <ίϝϯτจ> := "//" [A-Z_ ]* "\n"
def parse_comment_statement(text, index):
# TODO: ͪΌΜͱ࣮͢Δ
next_index = 1234 # TODO: Ծͷ࣮
node = CommentStatementNode(
comment_content=" COMMENT" # TODO: Ծͷ࣮
)
return node, next_index
ίϝϯτจʹରԠ͢ΔؔͷҾͱΓΛ֬ೝ͠Α͏
ؔͷ෦·ͩԾͷͷͰɺ͋ͱͰ࣮͍ͯ͘͠
Slide 102
Slide 102 text
# <ίϝϯτจ> := "//" [A-Z_ ]* "\n"
def parse_comment_statement(text, index):
# TODO: ͪΌΜͱ࣮͢Δ
next_index = 1234 # TODO: Ծͷ࣮
node = CommentStatementNode(
comment_content=" COMMENT" # TODO: Ծͷ࣮
)
return node, next_index
ʮQBSTFʯʮߏจղੳ͢Δʯͷҙຯ
Slide 103
Slide 103 text
# <ίϝϯτจ> := "//" [A-Z_ ]* "\n"
def parse_comment_statement(text, index):
# TODO: ͪΌΜͱ࣮͢Δ
next_index = 1234 # TODO: Ծͷ࣮
node = CommentStatementNode(
comment_content=" COMMENT" # TODO: Ծͷ࣮
)
return node, next_index
ղੳ͍ͨ͠ςΩετશମ ղੳ͍ͨ͠ςΩετͷҐஔ
Slide 104
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# <ίϝϯτจ> := "//" [A-Z_ ]* "\n"
def parse_comment_statement(text, index):
# TODO: ͪΌΜͱ࣮͢Δ
next_index = 1234 # TODO: Ծͷ࣮
node = CommentStatementNode(
comment_content=" COMMENT" # TODO: Ծͷ࣮
)
return node, next_index
ղੳͰ͖ͨίϝϯτจʹ
ରԠ͢Δநߏจͷϊʔυ ίϝϯτจ͕ऴΘͬͨҐஔ
Slide 105
Slide 105 text
ͱΓ͋͑ͣؔͷΘΕํΛΈͯΈΑ͏
Slide 106
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(comment_node, next_index) = parse_comment_statement("// COMMENT\n", 0)
ϓϩάϥϜͷઌ಄͔Βղੳ͢Δύλʔϯ ઌ಄ͳͷͰJOEFY
ղੳ͕ऴΘͬͨҐஔ
ίϝϯτจʹରԠ͢Δநߏจͷϊʔυ
Slide 107
Slide 107 text
(comment_node, next_index) = parse_comment_statement("'123'\n// COMMENT\n", 6)
ϓϩάϥϜͷ్த͔Βղੳ͢Δύλʔϯ
ղੳ͕ऴΘͬͨҐஔ
్தͷจࣈ͔Βղੳ͢Δ
ίϝϯτจʹରԠ͢Δநߏจͷϊʔυ
Slide 108
Slide 108 text
(comment_node, next_index) = parse_comment_statement("'123'\n/ INVALID", 6)
ղੳʹࣦഊ͢Δύλʔϯ
ࣦഊͨ͠ΒҐஔಈ͔͞ͳ͍Ͱͷ··ʹ͢Δ
͜ͷΑ͏ʹɺࣦഊͨ͠ΒԿͳ͔ͬͨΑ͏ʹ
ר͖Δ͜ͱΛʮόοΫτϥοΫʯͱݺͿ
ղੳʹࣦഊͨ͠ͷͰ/POF
్தͷจࣈ͔Βղੳ͢Δ
Slide 109
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Ҿ
w ղੳ͢Δจࣈྻશମͱ࢝ΊΔҐஔ
Γ
w ղੳͰ͖ͨநߏจͷϊʔυͱऴΘͬͨҐஔ
w ࣦഊͨ͠Β/POFΛฦͯ͠ɺ
Ґஔಈ͔͞ͳ͍
͜͜ͰҾͱΓΛཧ͠Α͏ɿ
Slide 110
Slide 110 text
Ҿ
w ղੳ͢Δจࣈྻશମͱ࢝ΊΔҐஔ
Γ
w ղੳͰ͖ͨநߏจͷϊʔυͱऴΘͬͨҐஔ
w ࣦഊͨ͠Β/POFΛฦͯ͠ɺ
Ґஔಈ͔͞ͳ͍
͜͜ͰҾͱΓΛཧ͠Α͏ɿ
͕ؔΈ߹Θͤ͘͢ͳΔͱ
ݴ͍ͬͯͨͷ͜ͷ෦
લͷؔʹΑΔղੳ͕ऴΘͬͨ
Ґஔ͔Βɺ࣍ͷؔʹΑΔղੳΛ
࠶։͢ΔΠϝʔδ
Slide 111
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࣮ࡍͷॲཧͷྲྀΕΛΈͯΈΑ͏
ҾͱΓ͕ͳΜͱͳ͘Θ͔ͬͨͷͰ
Slide 112
Slide 112 text
<ίϝϯτจ> := "//" [A-Z_ ]* "\n"
ίϝϯτจͷจ๏نଇͷಡΈํͷ͓͞Β͍ɿ
͡Ίʹ͕͋Δ
ଓ͚ͯӳେจࣈ͔@͔ۭന͕ճҎ্ଓ͘
࠷ޙʹվߦ͕͋Δ
Slide 113
Slide 113 text
def parse_comment_statement(text, index):
is_success, next_index = expect_keyword("//", text, index)
if not is_success:
return None, index
comment_content_chars = []
while True:
comment_content_char, next_index = \
expect_either(uppercase + [" ", "_"], text, next_index)
if comment_content_char is None:
break
comment_content_chars.append(comment_content_char)
is_success, next_index = expect_keyword("\n", text, next_index)
if not is_success:
return None, index
comment_content_chars = "".join(comment_content_chars)
return CommentStatementNode(comment_content_chars), next_index
<ίϝϯτจ> := "//" [A-Z_ ]* "\n"
Slide 114
Slide 114 text
def parse_comment_statement(text, index):
is_success, next_index = expect_keyword("//", text, index)
if not is_success:
return None, index
comment_content_chars = []
while True:
comment_content_char, next_index = \
expect_either(uppercase + [" ", "_"], text, next_index)
if comment_content_char is None:
break
comment_content_chars.append(comment_content_char)
is_success, next_index = expect_keyword("\n", text, next_index)
if not is_success:
return None, index
comment_content_chars = "".join(comment_content_chars)
return CommentStatementNode(comment_content_chars), next_index
<ίϝϯτจ> := "//" [A-Z_ ]* "\n"
ίϝϯτจʹରԠ͢Δؔ
Slide 115
Slide 115 text
def parse_comment_statement(text, index):
is_success, next_index = expect_keyword("//", text, index)
if not is_success:
return None, index
comment_content_chars = []
while True:
comment_content_char, next_index = \
expect_either(uppercase + [" ", "_"], text, next_index)
if comment_content_char is None:
break
comment_content_chars.append(comment_content_char)
is_success, next_index = expect_keyword("\n", text, next_index)
if not is_success:
return None, index
comment_content_chars = "".join(comment_content_chars)
return CommentStatementNode(comment_content_chars), next_index
͜͜Ͱ͕JOEFYͷҐஔʹ͋Δ͔Ͳ͏͔֬ೝ͍ͯ͠Δ
FYQFDU@LFZXPSEޙͰઆ໌͢Δ͕ɺΛݟ͚ͭͨΒ
JOEFYΛͷޙ·ͰҠಈͤ͞Δ
<ίϝϯτจ> := "//" [A-Z_ ]* "\n"
Slide 116
Slide 116 text
def parse_comment_statement(text, index):
is_success, next_index = expect_keyword("//", text, index)
if not is_success:
return None, index
comment_content_chars = []
while True:
comment_content_char, next_index = \
expect_either(uppercase + [" ", "_"], text, next_index)
if comment_content_char is None:
break
comment_content_chars.append(comment_content_char)
is_success, next_index = expect_keyword("\n", text, next_index)
if not is_success:
return None, index
comment_content_chars = "".join(comment_content_chars)
return CommentStatementNode(comment_content_chars), next_index
͕Έ͔ͭΒͳ͚ΕίϝϯτจͰͳ͍ͷͰऴྃ
<ίϝϯτจ> := "//" [A-Z_ ]* "\n"
Slide 117
Slide 117 text
def parse_comment_statement(text, index):
is_success, next_index = expect_keyword("//", text, index)
if not is_success:
return None, index
comment_content_chars = []
while True:
comment_content_char, next_index = \
expect_either(uppercase + [" ", "_"], text, next_index)
if comment_content_char is None:
break
comment_content_chars.append(comment_content_char)
is_success, next_index = expect_keyword("\n", text, next_index)
if not is_success:
return None, index
comment_content_chars = "".join(comment_content_chars)
return CommentStatementNode(comment_content_chars), next_index
͜ͷྻʹίϝϯτͷจࣈΛ֨ೲ͍ͯ͘͠
<ίϝϯτจ> := "//" [A-Z_ ]* "\n"
Slide 118
Slide 118 text
def parse_comment_statement(text, index):
is_success, next_index = expect_keyword("//", text, index)
if not is_success:
return None, index
comment_content_chars = []
while True:
comment_content_char, next_index = \
expect_either(uppercase + [" ", "_"], text, next_index)
if comment_content_char is None:
break
comment_content_chars.append(comment_content_char)
is_success, next_index = expect_keyword("\n", text, next_index)
if not is_success:
return None, index
comment_content_chars = "".join(comment_content_chars)
return CommentStatementNode(comment_content_chars), next_index
ίϝϯτͷจࣈ܁Γฦ͠ͳͷͰɺϧʔϓͰॲཧ͢Δ
<ίϝϯτจ> := "//" [A-Z_ ]* "\n"
Slide 119
Slide 119 text
def parse_comment_statement(text, index):
is_success, next_index = expect_keyword("//", text, index)
if not is_success:
return None, index
comment_content_chars = []
while True:
comment_content_char, next_index = \
expect_either(uppercase + [" ", "_"], text, next_index)
if comment_content_char is None:
break
comment_content_chars.append(comment_content_char)
is_success, next_index = expect_keyword("\n", text, next_index)
if not is_success:
return None, index
comment_content_chars = "".join(comment_content_chars)
return CommentStatementNode(comment_content_chars), next_index
JOEFYͷҐஔʹ<";@>͕͋Δ͔֬ೝ͍ͯ͠Δ
FYQFDU@FJUIFSʹ͍ͭͯޙͰઆ໌͢Δ
<ίϝϯτจ> := "//" [A-Z_ ]* "\n"
Slide 120
Slide 120 text
def parse_comment_statement(text, index):
is_success, next_index = expect_keyword("//", text, index)
if not is_success:
return None, index
comment_content_chars = []
while True:
comment_content_char, next_index = \
expect_either(uppercase + [" ", "_"], text, next_index)
if comment_content_char is None:
break
comment_content_chars.append(comment_content_char)
is_success, next_index = expect_keyword("\n", text, next_index)
if not is_success:
return None, index
comment_content_chars = "".join(comment_content_chars)
return CommentStatementNode(comment_content_chars), next_index
͠<";@>ʹҰக͠ͳ͔ͬͨΒɺίϝϯτͷ
༰෦͕ऴΘͬͨͷͰɺϧʔϓ͔Βग़
<ίϝϯτจ> := "//" [A-Z_ ]* "\n"
Slide 121
Slide 121 text
def parse_comment_statement(text, index):
is_success, next_index = expect_keyword("//", text, index)
if not is_success:
return None, index
comment_content_chars = []
while True:
comment_content_char, next_index = \
expect_either(uppercase + [" ", "_"], text, next_index)
if comment_content_char is None:
break
comment_content_chars.append(comment_content_char)
is_success, next_index = expect_keyword("\n", text, next_index)
if not is_success:
return None, index
comment_content_chars = "".join(comment_content_chars)
return CommentStatementNode(comment_content_chars), next_index
͠<";@>Ͱ͋Εɺίϝϯτจࣈྻ͕·ͩଓ͔͘
͠Εͳ͍ͷͰɺจࣈΛهͯ͠ϧʔϓΛ࠶։
<ίϝϯτจ> := "//" [A-Z_ ]* "\n"
Slide 122
Slide 122 text
def parse_comment_statement(text, index):
is_success, next_index = expect_keyword("//", text, index)
if not is_success:
return None, index
comment_content_chars = []
while True:
comment_content_char, next_index = \
expect_either(uppercase + [" ", "_"], text, next_index)
if comment_content_char is None:
break
comment_content_chars.append(comment_content_char)
is_success, next_index = expect_keyword("\n", text, next_index)
if not is_success:
return None, index
comment_content_chars = "".join(comment_content_chars)
return CommentStatementNode(comment_content_chars), next_index
ίϝϯτͷจࣈ͕ऴΘͬͨͷͰɺ࠷ޙʹ
վߦ͕͋Δ͔Ͳ͏͔֬ೝ͍ͯ͠Δ
<ίϝϯτจ> := "//" [A-Z_ ]* "\n"
Slide 123
Slide 123 text
def parse_comment_statement(text, index):
is_success, next_index = expect_keyword("//", text, index)
if not is_success:
return None, index
comment_content_chars = []
while True:
comment_content_char, next_index = \
expect_either(uppercase + [" ", "_"], text, next_index)
if comment_content_char is None:
break
comment_content_chars.append(comment_content_char)
is_success, next_index = expect_keyword("\n", text, next_index)
if not is_success:
return None, index
comment_content_chars = "".join(comment_content_chars)
return CommentStatementNode(comment_content_chars), next_index
aO͕ͳ͚ΕɺίϝϯτจͰͳ͍ͷͰ/POFͱ
ݩͷJOEFYΛฦ͢
<ίϝϯτจ> := "//" [A-Z_ ]* "\n"
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Slide 124 text
def parse_comment_statement(text, index):
is_success, next_index = expect_keyword("//", text, index)
if not is_success:
return None, index
comment_content_chars = []
while True:
comment_content_char, next_index = \
expect_either(uppercase + [" ", "_"], text, next_index)
if comment_content_char is None:
break
comment_content_chars.append(comment_content_char)
is_success, next_index = expect_keyword("\n", text, next_index)
if not is_success:
return None, index
comment_content_chars = "".join(comment_content_chars)
return CommentStatementNode(comment_content_chars), next_index
ه͓͍ͯͨ͠ίϝϯτͷจࣈΛ݁߹ͯ͠ɺ
ίϝϯτͷ༰จࣈྻΛ෮ݩ͢Δ
<ίϝϯτจ> := "//" [A-Z_ ]* "\n"
Slide 125
Slide 125 text
def parse_comment_statement(text, index):
is_success, next_index = expect_keyword("//", text, index)
if not is_success:
return None, index
comment_content_chars = []
while True:
comment_content_char, next_index = \
expect_either(uppercase + [" ", "_"], text, next_index)
if comment_content_char is None:
break
comment_content_chars.append(comment_content_char)
is_success, next_index = expect_keyword("\n", text, next_index)
if not is_success:
return None, index
comment_content_chars = "".join(comment_content_chars)
return CommentStatementNode(comment_content_chars), next_index
෮ݩͨ͠ίϝϯτจࣈྻ͔ΒίϝϯτจʹରԠ͢Δ
நߏจͷϊʔυΛ࡞ͯ͠ɺਐΊͨJOEFYͱฦ͢
<ίϝϯτจ> := "//" [A-Z_ ]* "\n"
Slide 126
Slide 126 text
<ίϝϯτจ> := "//" [A-Z_ ]* "\n"
def parse_comment_statement(text, index):
is_success, next_index = expect_keyword("//", text, index)
if not is_success:
return None, index
comment_content_chars = []
while True:
comment_content_char, next_index = \
expect_either(uppercase + [" ", "_"], text, next_index)
if comment_content_char is None:
break
comment_content_chars.append(comment_content_char)
is_success, next_index = expect_keyword("\n", text, next_index)
if not is_success:
return None, index
comment_content_chars = "".join(comment_content_chars)
return CommentStatementNode(comment_content_chars), next_index
ίϝϯτจʹରԠ͢ΔؔΛॻ͚ͨ
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Slide 127 text
FYQFDUdͳؔͷͨΒ͖
్தͰͰ͖ͯͨFYQFDUd͕ؾʹͳΔํ
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ઌ΄ͲͷQBSTF@DPNNFOU@TUBUFNFOUͷ࣮࣌ʹ
͋Γ͕ͪͳϛε͕ɺJOEFYͷਐΊΕਐΊ෯ͷؒҧ͍
FYQFDU@LFZXPSEFYQFDU@FJUIFS͜ΕΒͷؒҧ͍Λ
༧͢ΔͨΊͷϢʔςΟϦςΟؔ
Slide 129
Slide 129 text
text = "abc"
is_success, next_index = expect_keyword("a", text, 0)
is_success, next_index = expect_keyword("x", text, 0)
Bͷ࣍ͷJOEFYͳͷͰ
JOEFYͷҐஔʢͳͷͰઌ಄ʣʹB͕͋ΔͷͰ5SVF
ͳ͍߹JOEFYΛม͑ͳ͍ͷͰ
JOEFYͷҐஔʢͳͷͰઌ಄ʣʹYͳ͍ͷͰ'BMTF
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ൺֱͨ͠จࣈྻͷ͚ͩ͞JOEFYΛਐΊΔͷͰɺ
ਐΊ෯ͷؒҧ͍ͱਐΊΕΛ͛Δ
ศརʜ
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def expect_keyword(expected, text, index):
expected_len = len(expected)
actual = text[index:index+expected_len]
if actual != expected:
return False, index
return True, index + expected_len
def expect_either(expected_list, text, index):
for expected in expected_list:
is_success, next_index = expect_keyword(expected, text, index)
if is_success:
return expected, next_index
return None, index
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Slide 132 text
def expect_keyword(expected, text, index):
expected_len = len(expected)
actual = text[index:index+expected_len]
if actual != expected:
return False, index
return True, index + expected_len
def expect_either(expected_list, text, index):
for expected in expected_list:
is_success, next_index = expect_keyword(expected, text, index)
if is_success:
return expected, next_index
return None, index
ৄࡉͳ࣮͋ͱͰղಡͯ͠Έ͍ͯͩ͘͞ʂ
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͜͜·ͰͰίϝϯτจͷ
ղੳؔΛ࣮Ͱ͖ͨ
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࣍ʹɺจʹର͢Δ͔ؔΒઌ΄Ͳ
࣮ͨ͠ίϝϯτจʹରԠ͢ΔؔΛ
͏ํ๏ΛΈͯΈΑ͏
ϙΠϯτɺจ๏نଇͷͷӈଆʹ͕
͋ͬͨΒରԠ͢ΔղੳؔʹͤΔ͜ͱ
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<จ> := | <ࣜจ> | <ίϝϯτจ>
จͷจ๏نଇͷಡΈํͷ͓͞Β͍ɿ
จɺJGจɺࣜจɺίϝϯτจͷ͍ͣΕ͔
Slide 136
Slide 136 text
def parse_statement(text, index):
if_statement_node, next_index = parse_if_statement(text, index)
if if_statement_node is not None:
return if_statement_node, next_index
expr_statement_node, next_index = parse_expr_statement(text, index)
if expr_statement_node is not None:
return expr_statement_node, next_index
comment_statement_node, next_index = parse_comment_statement(text, index)
if comment_statement_node is not None:
return comment_statement_node, next_index
return None, index
<จ> := | <ࣜจ> | <ίϝϯτจ>
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Slide 137 text
def parse_statement(text, index):
if_statement_node, next_index = parse_if_statement(text, index)
if if_statement_node is not None:
return if_statement_node, next_index
expr_statement_node, next_index = parse_expr_statement(text, index)
if expr_statement_node is not None:
return expr_statement_node, next_index
comment_statement_node, next_index = parse_comment_statement(text, index)
if comment_statement_node is not None:
return comment_statement_node, next_index
return None, index
·ͣɺJGจʹରԠ͢ΔؔͰղੳͰ͖Δ͔Ͳ͏͔ࢼ͢
<จ> := | <ࣜจ> | <ίϝϯτจ>
Slide 138
Slide 138 text
def parse_statement(text, index):
if_statement_node, next_index = parse_if_statement(text, index)
if if_statement_node is not None:
return if_statement_node, next_index
expr_statement_node, next_index = parse_expr_statement(text, index)
if expr_statement_node is not None:
return expr_statement_node, next_index
comment_statement_node, next_index = parse_comment_statement(text, index)
if comment_statement_node is not None:
return comment_statement_node, next_index
return None, index
͠ɺJGจͱͯ͠ͷղੳʹޭ͢ΕจJGจͩͬͨͱ͍͏͜ͱ
JGจʹରԠ͢ΔநߏจͱɺJGจͷղੳͰਐΜͩJOEFYΛฦ͢
<จ> := | <ࣜจ> | <ίϝϯτจ>
Slide 139
Slide 139 text
def parse_statement(text, index):
if_statement_node, next_index = parse_if_statement(text, index)
if if_statement_node is not None:
return if_statement_node, next_index
expr_statement_node, next_index = parse_expr_statement(text, index)
if expr_statement_node is not None:
return expr_statement_node, next_index
comment_statement_node, next_index = parse_comment_statement(text, index)
if comment_statement_node is not None:
return comment_statement_node, next_index
return None, index
JGจͱͯ͠ͷղੳʹࣦഊͨ͠Βɺ࣍ʹࣜจͱͯ͠ͷղੳΛࢼ͢
<จ> := | <ࣜจ> | <ίϝϯτจ>
Slide 140
Slide 140 text
def parse_statement(text, index):
if_statement_node, next_index = parse_if_statement(text, index)
if if_statement_node is not None:
return if_statement_node, next_index
expr_statement_node, next_index = parse_expr_statement(text, index)
if expr_statement_node is not None:
return expr_statement_node, next_index
comment_statement_node, next_index = parse_comment_statement(text, index)
if comment_statement_node is not None:
return comment_statement_node, next_index
return None, index
͠ɺࣜจͱͯ͠ͷղੳʹޭ͢Εจࣜจͩͬͨͱ͍͏͜ͱ
ࣜจʹରԠ͢ΔநߏจͱɺࣜจͷղੳͰਐΜͩJOEFYΛฦ͢
<จ> := | <ࣜจ> | <ίϝϯτจ>
Slide 141
Slide 141 text
def parse_statement(text, index):
if_statement_node, next_index = parse_if_statement(text, index)
if if_statement_node is not None:
return if_statement_node, next_index
expr_statement_node, next_index = parse_expr_statement(text, index)
if expr_statement_node is not None:
return expr_statement_node, next_index
comment_statement_node, next_index = parse_comment_statement(text, index)
if comment_statement_node is not None:
return comment_statement_node, next_index
return None, index
ࣜจͱͯ͠ͷղੳʹࣦഊͨ͠Βɺ࠷ޙʹίϝϯτจͱͯ͠ͷղੳΛࢼ͢
<จ> := | <ࣜจ> | <ίϝϯτจ>
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Slide 142 text
def parse_statement(text, index):
if_statement_node, next_index = parse_if_statement(text, index)
if if_statement_node is not None:
return if_statement_node, next_index
expr_statement_node, next_index = parse_expr_statement(text, index)
if expr_statement_node is not None:
return expr_statement_node, next_index
comment_statement_node, next_index = parse_comment_statement(text, index)
if comment_statement_node is not None:
return comment_statement_node, next_index
return None, index
͠ɺίϝϯτจͱͯ͠ͷղੳʹޭ͢Εจίϝϯτจͩͬͨͱ͍͏͜ͱ
ίϝϯτจʹରԠ͢ΔநߏจͱɺίϝϯτจͷղੳͰਐΜͩJOEFYΛฦ͢
<จ> := | <ࣜจ> | <ίϝϯτจ>
Slide 143
Slide 143 text
def parse_statement(text, index):
if_statement_node, next_index = parse_if_statement(text, index)
if if_statement_node is not None:
return if_statement_node, next_index
expr_statement_node, next_index = parse_expr_statement(text, index)
if expr_statement_node is not None:
return expr_statement_node, next_index
comment_statement_node, next_index = parse_comment_statement(text, index)
if comment_statement_node is not None:
return comment_statement_node, next_index
return None, index
JGจɺࣜจɺίϝϯτจͷ͍ͣΕͰͳ͚Εɺ
จͰͳ͍ͷͰɺ/POFͱݩͷJOEFYΛฦͯ͠ऴྃ
<จ> := | <ࣜจ> | <ίϝϯτจ>
Slide 144
Slide 144 text
def parse_statement(text, index):
if_statement_node, next_index = parse_if_statement(text, index)
if if_statement_node is not None:
return if_statement_node, next_index
expr_statement_node, next_index = parse_expr_statement(text, index)
if expr_statement_node is not None:
return expr_statement_node, next_index
comment_statement_node, next_index = parse_comment_statement(text, index)
if comment_statement_node is not None:
return comment_statement_node, next_index
return None, index
<จ> := | <ࣜจ> | <ίϝϯτจ>
͜ͷΑ͏ʹʹରԠ͢ΔؔΛఆ͍ٛͯ͘͠ͱɺ
࠷ऴతʹϓϩάϥϜʹରԠ͢ΔؔΛఆٛͰ͖Δ
͜ͷϓϩάϥϜʹରԠ͢Δ͕ؔɺҰൠతʹ
ఏڙ͞Ε͍ͯΔߏจղੳثͱݺΕΔͷ
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ࠓճͷઆ໌Ͱ৮Εͳ͔ͬͨ͜ͱ
w ࣮༻తͳߏจղੳثʹ͢Δʹɺநߏจ
ߏจΤϥʔʹίʔυ্ͷҐஔใΛؚΊͨํ͕Α͍
w όοΫτϥοΫ͋Γͷ࣮ɺ୯७͔͔ͭͳΓ͍ൣғͷ
จ๏نଇΛղੳͰ͖Δ͕ɺܭࢉྔେ͖͍
w ࣮Ұ൪͍͠ͷόάͷͳ͍จ๏نଇΛߟ͑Δ͜ͱ
w όά͕͋Δͱߏจղੳث͕ແݶϧʔϓͨ͠Γ͢Δ
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ૉͳ࣮ͷ·ͱΊ
w ࣮ҎԼͷεςοϓͰͰ͖Δɿ
w ʹରԠ͢ΔநߏจΛఆٛ͢Δ
w ʹରԠ͢ΔؔΛఆٛ͢Δ
w จ๏نଇͷӈଆʹ͕͋Δ߹ɺ
ͦͷʹରԠ͢ΔؔʹղੳΛͤΔ
Slide 147
Slide 147 text
1BSTFS$PNCJOBUPSͷҖྗ
ͬͱΤϨΨϯτͳํ๏Λνϥݟͤ
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ࠓճհͨ͠ૉͳ࣮Λ1BSTFS$PNCJOBUPSͰ࣮͢Δͱɺ
ಉ͡ॲཧͳͷʹڻ͘΄Ͳ࣮͕͘ͳΓɺ͔ͭ࠶ར༻ੑ্͕͕Δɿ
parse_comment = sequence(
string("//"),
sequence(
many(char(uppercase + ["_", " "])),
string("\n")
)
)
ؾʹͳΔਓɺεϥΠυඌͷࢀߟจݙ#Λࢀর
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ߏจղੳͷ·ͱΊ
w ߏจղੳίʔυΛղੳͯ͠நߏจΛ
࡞͢Δॲཧ
w ͞·͟·ͳߏจղੳͷΞϧΰϦζϜ͕͋Δ
w ࠓճόοΫτϥοΫ͋Γͷ
࠶ؼԼ߱ੳΛૉʹ࣮ͨ͠
Slide 150
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நߏจΛॲཧ͢Δ
දతͳ࣮ύλʔϯ
ߏจղੳͷ͓࣍
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͜Ε·Ͱɺநߏจͷ֓ཁ࡞ํ๏ΛΈ͖ͯͨ
࣍ʹɺ͜͜ͰநߏจΛ͔͋ͭ͏දతͳ
࣮ύλʔϯΛհ͢Δ
ͬͱසൟʹ͏࣮ύλʔϯͱͯ͠ɺநߏจΛ
ॱ൪ʹ୳ࡧ͍ͯࠪؔ͘͠Λհ͢Δ
Slide 152
Slide 152 text
ࠪؔ
நߏจΛ͔͋ͭ͏දతύλʔϯ
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ࠪؔɺநߏจͷϊʔυΛॱʹḷ͍ͬͯͬͯɺ
ϊʔυʹ๚ΕΔΕΔͨͼʹॲཧΛ࣮ߦ͢Δؔ
traverse(node, on_enter, on_leave)
PO@FOUFSͱPO@MFBWFͲͪΒؔΛ͢
ϊʔυʹ๚ΕΔΕΔͱ࣮ߦ͞ΕΔ
Կ͕ى͜Δ͔Θ͔ΓͮΒ͍ͷͰਤղ͠·͢
Slide 154
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def print_enter(node):
print("enter: {node}".format(node=type(node)))
def print_leave(node):
print("leave: {node}".format(node=type(node)))
traverse(node, print_enter, print_leave)
PO@FOUFSͱPO@MFBWF͕Θ͔ΔΑ͏ʹQSJOU͢ΔؔΛ༻ҙ
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͜ͷUSBWFSTFʹΑͬͯQSJOU͞ΕΔ݁ՌΛΈͯΈ·͠ΐ͏
QSJOU݁Ռ
1SPHSBN
*G4UBUFNFOU
4USJOH-JUFSBM
'VOD$BMM
*EFOUJpFS
$PNNFOU
Slide 156
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*G4UBUFNFOU
4USJOH-JUFSBM
'VOD$BMM
*EFOUJpFS
$PNNFOU
1SPHSBN
·ͣ1SPHSBNʹ๚ΕΔʢFOUFS1SPHSBNΛQSJOUʣ
FOUFS1SPHSBN
QSJOU݁Ռ
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1SPHSBN
4USJOH-JUFSBM
'VOD$BMM
*EFOUJpFS
$PNNFOU
*G4UBUFNFOU
࣍ʹ1SPHSBNͷࢠͰ͋Δ*G4UBUFNFOU๚ΕΔ
FOUFS1SPHSBN
FOUFS*G4UBUFNFOU
QSJOU݁Ռ
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1SPHSBN
*G4UBUFNFOU
4USJOH-JUFSBM
*EFOUJpFS
$PNNFOU
'VOD$BMM
࣍ʹ*G4UBUFNFOUͷࢠͰ͋Δ'VOD$BMMΛ๚ΕΔ
FOUFS1SPHSBN
FOUFS*G4UBUFNFOU
FOUFS'VOD$BMM
QSJOU݁Ռ
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1SPHSBN
*G4UBUFNFOU
4USJOH-JUFSBM
'VOD$BMM $PNNFOU
*EFOUJpFS
QSJOU݁Ռ
࣍ʹ'VOD$BMMͷࢠͰ͋Δ*EFOUJpFSΛ๚ΕΔ
FOUFS1SPHSBN
FOUFS*G4UBUFNFOU
FOUFS'VOD$BMM
FOUFS*EFOUJpFS
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1SPHSBN
*G4UBUFNFOU
4USJOH-JUFSBM
'VOD$BMM $PNNFOU
*EFOUJpFS
QSJOU݁Ռ
*EFOUJpFSʹࢠ͍ͳ͍ͷͰɺ*EFOUJpFS͔ΒΕΔ
FOUFS1SPHSBN
FOUFS*G4UBUFNFOU
FOUFS'VOD$BMM
FOUFS*EFOUJpFS
MFBWF*EFOUJpFS
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1SPHSBN
*G4UBUFNFOU
'VOD$BMM $PNNFOU
*EFOUJpFS 4USJOH-JUFSBM
QSJOU݁Ռ
'VOD$BMMͷ࣍ͷࢠͰ͋Δ4USJOH-JUFSBMΛ๚ΕΔ
FOUFS1SPHSBN
FOUFS*G4UBUFNFOU
FOUFS'VOD$BMM
FOUFS*EFOUJpFS
MFBWF*EFOUJpFS
FOUFS4USJOH-JUFSBM
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Slide 162 text
1SPHSBN
*G4UBUFNFOU
'VOD$BMM $PNNFOU
*EFOUJpFS 4USJOH-JUFSBM
QSJOU݁Ռ
4USJOH-JUFSBMʹࢠ͍ͳ͍ͷͰɺ4USJOH-JUFSBM͔ΒΕΔ
FOUFS1SPHSBN
FOUFS*G4UBUFNFOU
FOUFS'VOD$BMM
FOUFS*EFOUJpFS
MFBWF*EFOUJpFS
FOUFS4USJOH-JUFSBM
MFBWF4USJOH-JUFSBM
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Slide 163 text
1SPHSBN
*G4UBUFNFOU
$PNNFOU
*EFOUJpFS 4USJOH-JUFSBM
'VOD$BMM
QSJOU݁Ռ
'VOD$BMMͷͯ͢ͷࢠΛ๚ͨ͠ͷͰɺ'VOD$BMM͔ΒΕΔ
FOUFS1SPHSBN
FOUFS*G4UBUFNFOU
FOUFS'VOD$BMM
FOUFS*EFOUJpFS
MFBWF*EFOUJpFS
FOUFS4USJOH-JUFSBM
MFBWF4USJOH-JUFSBM
MFBWF'VOD$BMM
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1SPHSBN
*G4UBUFNFOU
*EFOUJpFS 4USJOH-JUFSBM
'VOD$BMM $PNNFOU
QSJOU݁Ռ
*G4UBUFNFOUͷ࣍ͷࢠͰ͋Δ$PNNFOUΛ๚ΕΔ
FOUFS1SPHSBN
FOUFS*G4UBUFNFOU
FOUFS'VOD$BMM
FOUFS*EFOUJpFS
MFBWF*EFOUJpFS
FOUFS4USJOH-JUFSBM
MFBWF4USJOH-JUFSBM
MFBWF'VOD$BMM
FOUFS$PNNFOU
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1SPHSBN
*G4UBUFNFOU
*EFOUJpFS 4USJOH-JUFSBM
'VOD$BMM $PNNFOU
QSJOU݁Ռ
$PNNFOUʹࢠ͍ͳ͍ͷͰɺ$PNNFOU͔ΒΕΔ
FOUFS1SPHSBN
FOUFS*G4UBUFNFOU
FOUFS'VOD$BMM
FOUFS*EFOUJpFS
MFBWF*EFOUJpFS
FOUFS4USJOH-JUFSBM
MFBWF4USJOH-JUFSBM
MFBWF'VOD$BMM
FOUFS$PNNFOU
MFBWF$PNNFOU
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1SPHSBN
*EFOUJpFS 4USJOH-JUFSBM
'VOD$BMM $PNNFOU
*G4UBUFNFOU
QSJOU݁Ռ
*G4UBUFNFOUͷͯ͢ͷࢠΛ๚ͨ͠ͷͰɺΕΔ
FOUFS1SPHSBN
FOUFS*G4UBUFNFOU
FOUFS'VOD$BMM
FOUFS*EFOUJpFS
MFBWF*EFOUJpFS
FOUFS4USJOH-JUFSBM
MFBWF4USJOH-JUFSBM
MFBWF'VOD$BMM
FOUFS$PNNFOU
MFBWF$PNNFOU
MFBWF*G4UBUFNFOU
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*EFOUJpFS 4USJOH-JUFSBM
'VOD$BMM $PNNFOU
*G4UBUFNFOU
1SPHSBN
QSJOU݁Ռ
1SPHSBNͷͯ͢ͷࢠΛ๚ͨ͠ͷͰɺࠪྃ
FOUFS1SPHSBN
FOUFS*G4UBUFNFOU
FOUFS'VOD$BMM
FOUFS*EFOUJpFS
MFBWF*EFOUJpFS
FOUFS4USJOH-JUFSBM
MFBWF4USJOH-JUFSBM
MFBWF'VOD$BMM
FOUFS$PNNFOU
MFBWF$PNNFOU
MFBWF*G4UBUFNFOU
MFBWF1SPHSBN
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*EFOUJpFS 4USJOH-JUFSBM
'VOD$BMM $PNNFOU
*G4UBUFNFOU
1SPHSBN
QSJOU݁Ռ
ཁ͢ΔʹɺநߏจΛਂ͞༏ઌ୳ࡧ͢Δؔ
FOUFS1SPHSBN
FOUFS*G4UBUFNFOU
FOUFS'VOD$BMM
FOUFS*EFOUJpFS
MFBWF*EFOUJpFS
FOUFS4USJOH-JUFSBM
MFBWF4USJOH-JUFSBM
MFBWF'VOD$BMM
FOUFS$PNNFOU
MFBWF$PNNFOU
MFBWF*G4UBUFNFOU
MFBWF1SPHSBN
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͜ͷΑ͏ͳநߏจΛࠪ͢Δ͕ؔ
༻ҙ͞Ε͍ͯΔͱɺ͞ΒʹޙͰհ͢Δ
੩తݕࠪͷίʔυ͕ͱͯॻ͖͘͢ͳΔ
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ͯ͢ͷநߏจͷϊʔυʹɺࣗͷ
ࢠͷҰཡΛฦؔ͢ΛՃ͢Δ
ϊʔυΛ๚ΕͨΒͷࢠͷҰཡΛऔಘͯ͠ɺ
࠶ؼతʹ๚Ε͍ͯؔ͘Λ࣮͢Δ
ࠪؔͷ࣮खॱ
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class Node:
def children(self):
raise NotImplementedError()
class ProgramNode(Node):
def __init__(self, statement_nodes):
self.statements = statement_nodes
def children(self):
return self.statements
நߏจͷϊʔυ͕ࣗͷࢠΛฦ͢Α͏ʹཁٻ͢ΔجఈΫϥεΛ༻ҙ
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class Node:
def children(self):
raise NotImplementedError()
class ProgramNode(Node):
def __init__(self, statement_nodes):
self.statements = statement_nodes
def children(self):
return self.statements
ͦΕͧΕͷநߏจͷϊʔυʹ࣮ͯ͠Β͏
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class Node:
def children(self):
raise NotImplementedError()
class ProgramNode(Node):
def __init__(self, statement_nodes):
self.statements = statement_nodes
def children(self):
return self.statements
ϓϩάϥϜͷͯ͢ͷࢠͷҰཡΛྻͱͯ͠ฦ͢
ࠓճจͷྻҎ֎ʹࢠͳ͍ͷͰͦͷ··ฦͤΑ͍
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class IfStatementNode(Node):
def __init__(self, condition_node, then_statements):
self.condition_node = condition_node
self.then_statements = then_statements
def children(self):
children = [self.condition_node]
return children + self.then_statements
ผͷέʔεͱͯ͠ɺJGจͷநߏจͷϊʔυΈͯΈΑ͏
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class IfStatementNode(Node):
def __init__(self, condition_node, then_statements):
self.condition_node = condition_node
self.then_statements = then_statements
def children(self):
children = [self.condition_node]
return children + self.then_statements
JGจͷࢠ݅෦ͷࣜͱɺ\^ͷதͷ
ෳͷจͳͷͰɺ·ͱΊͯҰཡʹͯ͠ฦ͢
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class IfStatementNode(Node):
def __init__(self, condition_node, then_statements):
self.condition_node = condition_node
self.then_statements = then_statements
def children(self):
children = [self.condition_node]
return children + self.then_statements
ಉ༷ʹɺͯ͢ͷநߏจͷϊʔυʹDIJMESFOΛ࣮ͤ͞Δ
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४උ͕ͬͨͷͰɺࠪؔͷ
ຊମΛ࣮͍ͯ͘͠
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def traverse(node, on_enter=None, on_leave=None):
if on_enter is not None:
on_enter(node)
for child in node.children():
traverse(child, on_enter, on_leave)
if on_leave is not None:
on_leave(node)
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def traverse(node, on_enter=None, on_leave=None):
if on_enter is not None:
on_enter(node)
for child in node.children():
traverse(child, on_enter, on_leave)
if on_leave is not None:
on_leave(node)
நߏจͷϊʔυΛ๚ΕͨͷͰPO@FOUFSΛ࣮ߦ͢Δ
͠PO@FOUFS͕লུ͞Ε͍ͯΔ߹Կ͠ͳ͍
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def traverse(node, on_enter=None, on_leave=None):
if on_enter is not None:
on_enter(node)
for child in node.children():
traverse(child, on_enter, on_leave)
if on_leave is not None:
on_leave(node)
நߏจͷϊʔυ͔ΒࢠͷҰཡΛ
औಘ͠ɺࢠΛ࠶ؼతʹ͍ࠪͯ͘͠
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def traverse(node, on_enter=None, on_leave=None):
if on_enter is not None:
on_enter(node)
for child in node.children():
traverse(child, on_enter, on_leave)
if on_leave is not None:
on_leave(node)
ࢠͷ͕ࠪऴΘͬͨͷͰɺࠓͷϊʔυ͔Βୀग़͢Δ
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͜͜·ͰͰ؆୯ʹࠪؔΛ࣮Ͱ͖ͨ
ࠪؔྻͰ͍͏GPS&BDIͷΑ͏ͳ
جૅతͳؔͩͱߟ͑ΔͱΘ͔Γ͍͢
ͦͷͨΊɺͱͯԠ༻ͷൣғ͕͍
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w ݅ʹ͋ͬͨநߏจͷϊʔυͷநग़
w มؔͷείʔϓղੳ
w ʜ
ࠪؔͰͰ͖Δ͜ͱ
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found = find_nodes(node, condition)
݅ʹ͋ͬͨநߏจͷϊʔυͷநग़
୳ࡧ͍ͨ͠நߏจ ݕࡧ͍ͨ݅͠ͷؔ
͜ͷநग़ؔࠪؔΛͬͯ
؆୯ʹ࣮Ͱ͖Δ
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def find_nodes(node, condition):
found_nodes = []
def collect_nodes(entered_node):
if not condition(entered_node):
return
found_nodes.append(entered_node)
traverse(node, collect_nodes)
return found_nodes
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def find_nodes(node, condition):
found_nodes = []
def collect_nodes(entered_node):
if not condition(entered_node):
return
found_nodes.append(entered_node)
traverse(node, collect_nodes)
return found_nodes
ݕࡧ݅ʹ͋ͯ·ΔநߏจͷϊʔυΛूΊΔྻ
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def find_nodes(node, condition):
found_nodes = []
def collect_nodes(entered_node):
if not condition(entered_node):
return
found_nodes.append(entered_node)
traverse(node, collect_nodes)
return found_nodes
நߏจͷϊʔυΛ๚ΕΔλΠϛϯάͰݕࡧ݅ͷ
ؔΛ࣮͠ɺ݅ʹ͋ͯ·ΔϊʔυΛूΊΔؔ
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def find_nodes(node, condition):
found_nodes = []
def collect_nodes(entered_node):
if not condition(entered_node):
return
found_nodes.append(entered_node)
traverse(node, collect_nodes)
return found_nodes
நߏจͷϊʔυΛूΊΔؔΛ
PO@FOUFSʹࢦఆͯࠪ͠Λ։࢝
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def find_nodes(node, condition):
found_nodes = []
def collect_nodes(entered_node):
if not condition(entered_node):
return
found_nodes.append(entered_node)
traverse(node, collect_nodes)
return found_nodes
ݟ͔ͭͬͨநߏจͷϊʔυͷྻΛฦ͢
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def find_nodes(node, condition):
found_nodes = []
def collect_nodes(entered_node):
if not condition(entered_node):
return
found_nodes.append(entered_node)
traverse(node, collect_nodes)
return found_nodes
ࠪؔΛ͏͜ͱͰɺͱͯ؆୯ʹ࣮Ͱ͖ͨ
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ଞʹɺࠪؔΛ͏ͱείʔϓղੳΛ
࣮͘͢͠ͳΔ
είʔϓղੳͱɺมͷఆٛ͞Ε͍ͯΔ
είʔϓΛղੳ͢Δ͜ͱͰɺະఆٛͷม
ະ༻ͷมΛݟ͚ͭΔख๏
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ίʔυ͕͔ͳΓ͘ͳΔͷͰɺ࣮ࡍͷίʔυׂѪ͢Δ͕ɺ
େ·͔ʹҎԼͷखॱͰείʔϓΛղੳͰ͖Δɿ
ؔએݴͷߏจͷPO@FOUFSͰ
είʔϓΦϒδΣΫτΛ࡞͢Δ
࡞ͨ͠είʔϓΦϒδΣΫτΛ
ݱࡏͷείʔϓͷελοΫʹੵΉ
ݟ͔ͭͬͨมએݴΛελοΫͷઌ಄ͷ
είʔϓΦϒδΣΫτՃ͍͑ͯ͘
ؔએݴͷߏจ͔ΒͷPO@MFBWFͰ
ઌ಄ͷείʔϓΦϒδΣΫτΛ
ελοΫ͔ΒऔΓআ͘
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• https://github.com/estools/escope
• https://github.com/rubocop-hq/rubocop
ͷ VariableForce
• https://github.com/Kuniwak/vint
ͷ scope_plugin
ࢀߟʹͳΔείʔϓղੳͷ࣮
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ࠪؔͷ࣮Ͱઆ໌͠ͳ͔ͬͨ͜ͱ
w ࠪͷதஅࢠͷ୳ࡧͷεΩοϓػೳ
w ύϑΥʔϚϯεվળͷͨΊʹॏཁ
w ୈڃؔΛΘͳ͍ࠪؔͷ࣮
w ݴޠʹΑͬͯؔΛҾʹͤͳ͍͜ͱ͋Δ
w ͦͷ߹(P'ͷ7JTJUPSύλʔϯͰସՄೳ
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ࠪؔͷ·ͱΊ
w நߏจͷࠪؔΛఆ͓ٛͯ͘͠ͱศར
w ࠪؔͷ࣮͘͠ͳ͍
w ࠪؔ͞·͟·ͳॲཧԠ༻Ͱ͖Δ
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؆୯ͳ੩తղੳΛ
࣮ͯ͠ΈΑ͏
Α͏͘ΰʔϧ
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if isEmpty('') {
//CATCH_ME_IF_YOU_CAN
}
͓ɺੜҙؾͳίϝϯτΛใࠂ͢Δ੩తղੳ
report_specific_comments(text)
# Found 1 namaiki comments!
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ߏจղੳͯ͠நߏจΛ࡞͢Δ
நߏจΛࠪͯ͠ྫͷίϝϯτΛूΊΔ
ूΊͨίϝϯτΛใࠂ͢Δ
࣮ͷྲྀΕ
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def report_namaiki_comments(text):
node = parse_program(text)
if node is None:
print("Syntax Error!")
return
namaiki_comments = find_nodes(node, is_namaiki_comment)
print("Found {count} comments!".format(count=len(namaiki_comments)))
def is_namaiki_comment(entered_node):
if not isinstance(entered_node, CommentStatementNode):
return False
comment_node = entered_node
return "CATCH_ME_IF_YOU_CAN" in comment_node.comment_content
ίʔυ͔ΒੜҙؾͳίϝϯτΛݟ͚ͭͯΛใࠂ͢Δؔ
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def report_namaiki_comments(text):
node = parse_program(text)
if node is None:
print("Syntax Error!")
return
namaiki_comments = find_nodes(node, is_namaiki_comment)
print("Found {count} comments!".format(count=len(namaiki_comments)))
def is_namaiki_comment(entered_node):
if not isinstance(entered_node, CommentStatementNode):
return False
comment_node = entered_node
return "CATCH_ME_IF_YOU_CAN" in comment_node.comment_content
ίʔυΛߏจղੳͯ͠நߏจΛ࡞͢Δ
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def report_namaiki_comments(text):
node = parse_program(text)
if node is None:
print("Syntax Error!")
return
namaiki_comments = find_nodes(node, is_namaiki_comment)
print("Found {count} comments!".format(count=len(namaiki_comments)))
def is_namaiki_comment(entered_node):
if not isinstance(entered_node, CommentStatementNode):
return False
comment_node = entered_node
return "CATCH_ME_IF_YOU_CAN" in comment_node.comment_content
ߏจղੳʹࣦഊͨ͠ΒɺߏจΤϥʔΛදࣔ
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def report_namaiki_comments(text):
node = parse_program(text)
if node is None:
print("Syntax Error!")
return
namaiki_comments = find_nodes(node, is_namaiki_comment)
print("Found {count} comments!".format(count=len(namaiki_comments)))
def is_namaiki_comment(entered_node):
if not isinstance(entered_node, CommentStatementNode):
return False
comment_node = entered_node
return "CATCH_ME_IF_YOU_CAN" in comment_node.comment_content
ࠪؔͷར༻ྫͱ࣮ͯͨ͠͠ɺݕࡧؔΛͬͯੜҙؾͳίϝϯτΛूΊΔ
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def report_namaiki_comments(text):
node = parse_program(text)
if node is None:
print("Syntax Error!")
return
namaiki_comments = find_nodes(node, is_namaiki_comment)
print("Found {count} comments!".format(count=len(namaiki_comments)))
def is_namaiki_comment(entered_node):
if not isinstance(entered_node, CommentStatementNode):
return False
comment_node = entered_node
return "CATCH_ME_IF_YOU_CAN" in comment_node.comment_content
ݕࡧؔͷ݅ʹࢦఆͨ͠ɺੜҙؾίϝϯτ͔Ͳ͏͔ఆ͢Δؔ
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def report_namaiki_comments(text):
node = parse_program(text)
if node is None:
print("Syntax Error!")
return
namaiki_comments = find_nodes(node, is_namaiki_comment)
print("Found {count} comments!".format(count=len(namaiki_comments)))
def is_namaiki_comment(entered_node):
if not isinstance(entered_node, CommentStatementNode):
return False
comment_node = entered_node
return "CATCH_ME_IF_YOU_CAN" in comment_node.comment_content
·ͣɺநߏจ͕ίϝϯτจͰͳ͚Εɺ
ੜҙؾͳίϝϯτͰͳ͍ͷͰɺ'BMTFΛฦͯ͠ऴྃ
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def report_namaiki_comments(text):
node = parse_program(text)
if node is None:
print("Syntax Error!")
return
namaiki_comments = find_nodes(node, is_namaiki_comment)
print("Found {count} comments!".format(count=len(namaiki_comments)))
def is_namaiki_comment(entered_node):
if not isinstance(entered_node, CommentStatementNode):
return False
comment_node = entered_node
return "CATCH_ME_IF_YOU_CAN" in comment_node.comment_content
ίϝϯτจͩͬͨ߹ɺίϝϯτͷ༰ʹੜҙؾͳ
ͷؚ͕·Ε͍ͯΕ5SVFɺͦΕҎ֎'BMTFΛฦ͢
Slide 206
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def report_namaiki_comments(text):
node = parse_program(text)
if node is None:
print("Syntax Error!")
return
namaiki_comments = find_nodes(node, is_namaiki_comment)
print("Found {count} comments!".format(count=len(namaiki_comments)))
def is_namaiki_comment(entered_node):
if not isinstance(entered_node, CommentStatementNode):
return False
comment_node = entered_node
return "CATCH_ME_IF_YOU_CAN" in comment_node.comment_content
ઌ΄ͲͷؔͰ5SVF͕ฦ͞Εͨநߏจʢੜҙؾͳίϝϯτʣ͕
Ұཡʹͯ͠ฦ͞ΕΔ
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def report_namaiki_comments(text):
node = parse_program(text)
if node is None:
print("Syntax Error!")
return
namaiki_comments = find_nodes(node, is_namaiki_comment)
print("Found {count} comments!".format(count=len(namaiki_comments)))
def is_namaiki_comment(entered_node):
if not isinstance(entered_node, CommentStatementNode):
return False
comment_node = entered_node
return "CATCH_ME_IF_YOU_CAN" in comment_node.comment_content
ੜҙؾͳίϝϯτͷΛใࠂͯ͠ऴྃ
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def report_namaiki_comments(text):
node = parse_program(text)
if node is None:
print("Syntax Error!")
return
namaiki_comments = find_nodes(node, is_namaiki_comment)
print("Found {count} comments!".format(count=len(namaiki_comments)))
def is_namaiki_comment(entered_node):
if not isinstance(entered_node, CommentStatementNode):
return False
comment_node = entered_node
return "CATCH_ME_IF_YOU_CAN" in comment_node.comment_content
ߏจղੳثɾࠪؔɾݕࡧؔΛ
Έ߹Θͤͯ͏͜ͱͰɺͱͯ
؆୯ʹ੩తݕࠪΛ࣮Ͱ͖ͨ
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؆୯ͳ੩తݕࠪͷ࣮·ͱΊ
੩తݕࠪɺߏจղੳثɾࠪؔɾݕࡧؔΛ
Έ߹ΘͤΔ͜ͱͰɺ͘͝؆୯ʹ࣮Ͱ͖Δ
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ෳࡶͳ੩తղੳΛ
ׂ͢ΔςΫχοΫ
ΰʔϧୡͷͦͷઌ
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ઌ΄Ͳͭͷ੩తݕࠪϧʔϧͷΈΛ࣮͕ͨ͠ɺ
ݱ࣮ʹෳͷݕࠪϧʔϧΛ࣮͢Δ͜ͱ͕ଟ͍
͜ͷͱ͖ɺͲͷΑ͏ʹίʔυΛׂ͢Δ͔ʹΑͬͯ
อकੑ͕େ͖͘มΘΔ
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ݕࠪϧʔϧʹΑΔׂΛհ
༗໊ͳ੩తղੳπʔϧͷҎ্͕࠾༻͍ͯ͠Δ
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ݕࠪϧʔϧʹΑΔׂͰɺͭͷݕࠪϧʔϧ͕
ͭͷίϯϙʔωϯτʢΫϥεPSؔʣʹରԠ͢Δ
͜ΕʹΑͬͯݕࠪϧʔϧ͕͓ޓ͍ʹૄʹͳΓɺ
ݕࠪϧʔϧͷՃमਖ਼আΛΓ͘͢ͳΔ
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class Policy:
def get_violations(self, node):
raise NotImplementedError()
ݕࠪϧʔϧͷڞ௨ΠϯλʔϑΣʔεΛܾΊΔ
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class Policy:
def get_violations(self, node):
raise NotImplementedError()
நߏจͷϊʔυ͔Βݟ͔ͭͬͨΛɺจࣈྻͷ
ྻͱͯ͠ฦ͢ϝιουɻ͜ͷϝιουɺ΄͔ͷ
ίϯϙʔωϯτͰ͔ࠪؔΒݺΕΔΠϝʔδ
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class Policy:
def get_violations(self, node):
raise NotImplementedError()
ྫ͑ɺҾʹੜҙؾͳίϝϯτจ͕͖ͨΒ
ࢦఠϝοηʔδΛฦ࣮͢ɺJGจ͕͖ͨΒ
݅෦ͷࣜΛݕࠪ͢Δͧɺͱ͍͏࣮͕͋Γ͑Δ
ॏཁͳͷɺݕࠪϧʔϧ͕ผͳΒผͷΫϥεʹ
ׂ࣮ͯ͢͠Δ͜ͱɻҰॹʹ͢Δͱอक͕େมʹͳΔ
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class NamaikiCommentPolicy(Policy):
def get_violations(self, node):
if not is_namaiki_comment(node):
return []
return ["FOUND YOU!"]
def is_namaiki_comment(entered_node):
if not isinstance(entered_node, CommentStatementNode):
return False
comment_node = entered_node
return "CATCH_ME_IF_YOU_CAN" in comment_node.comment_content
લʹ࣮ͨ͠ͷͱಉ͡ɺੜҙؾͳίϝϯτจΛࢦఠ͢Δݕࠪϧʔϧ
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class NamaikiCommentPolicy(Policy):
def get_violations(self, node):
if not is_namaiki_comment(node):
return []
return ["FOUND YOU!"]
def is_namaiki_comment(entered_node):
if not isinstance(entered_node, CommentStatementNode):
return False
comment_node = entered_node
return "CATCH_ME_IF_YOU_CAN" in comment_node.comment_content
Ҿͷநߏจͷϊʔυ͕ੜҙؾͳίϝϯτจʼͳΒɺ
ʮݟ͚ͭͨͧʂʯͱ͍͏ϝοηʔδΛฦ͢Α͏ʹ࣮
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class NamaikiCommentPolicy(Policy):
def get_violations(self, node):
if not is_namaiki_comment(node):
return []
return ["FOUND YOU!"]
def is_namaiki_comment(entered_node):
if not isinstance(entered_node, CommentStatementNode):
return False
comment_node = entered_node
return "CATCH_ME_IF_YOU_CAN" in comment_node.comment_content
ੜҙؾͳίϝϯτจΛఆ͢ΔؔલͷͷΛྲྀ༻
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class Policies(Policy):
def __init__(self, policies):
self.policies = policies
def get_violations(self, node):
return reduce(
lambda violations, policy: violations + policy.get_violations(node),
self.policies,
[]
)
ෳͷݕࠪϧʔϧΛଋͶΔݕࠪϧʔϧΛ४උ
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class Policies(Policy):
def __init__(self, policies):
self.policies = policies
def get_violations(self, node):
return reduce(
lambda violations, policy: violations + policy.get_violations(node),
self.policies,
[]
)
ݕࠪϧʔϧͱಉ͡ڞ௨ΠϯλʔϑΣʔεΛ࣮͢Δ
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class Policies(Policy):
def __init__(self, policies):
self.policies = policies
def get_violations(self, node):
return reduce(
lambda violations, policy: violations + policy.get_violations(node),
self.policies,
[]
)
෦ͷෳͷݕࠪϧʔϧΛϧʔϓͯ͠ݕࠪͯ͠ɺ݁ՌΛ߹ͯ͠ฦ͢
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def lint(text):
node = parse_program(text)
if node is None:
return ["Syntax Error!"]
policies = Policies([NamaikiCommentPolicy()])
violations_buffer = []
def collect_violations(entered_node):
violations = policies.get_violations(entered_node)
violations_buffer.append(violations)
traverse(node, collect_violations)
all_violations = []
return reduce(add, violations_buffer, all_violations)
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def lint(text):
node = parse_program(text)
if node is None:
return ["Syntax Error!"]
policies = Policies([NamaikiCommentPolicy()])
violations_buffer = []
def collect_violations(entered_node):
violations = policies.get_violations(entered_node)
violations_buffer.append(violations)
traverse(node, collect_violations)
all_violations = []
return reduce(add, violations_buffer, all_violations)
ෳͷݕࠪϧʔϧͰ·ͱΊͯݕࠪ͢Δؔ
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def lint(text):
node = parse_program(text)
if node is None:
return ["Syntax Error!"]
policies = Policies([NamaikiCommentPolicy()])
violations_buffer = []
def collect_violations(entered_node):
violations = policies.get_violations(entered_node)
violations_buffer.append(violations)
traverse(node, collect_violations)
all_violations = []
return reduce(add, violations_buffer, all_violations)
༩͑ΒΕͯจࣈྻΛߏจղੳͯ͠நߏจΛ࡞
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def lint(text):
node = parse_program(text)
if node is None:
return ["Syntax Error!"]
policies = Policies([NamaikiCommentPolicy()])
violations_buffer = []
def collect_violations(entered_node):
violations = policies.get_violations(entered_node)
violations_buffer.append(violations)
traverse(node, collect_violations)
all_violations = []
return reduce(add, violations_buffer, all_violations)
ߏจղੳʹࣦഊͨ͠ΒɺߏจղੳࣦഊͷϝοηʔδΛ݁Ռͱͯ͠ฦ͢
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def lint(text):
node = parse_program(text)
if node is None:
return ["Syntax Error!"]
policies = Policies([NamaikiCommentPolicy()])
violations_buffer = []
def collect_violations(entered_node):
violations = policies.get_violations(entered_node)
violations_buffer.append(violations)
traverse(node, collect_violations)
all_violations = []
return reduce(add, violations_buffer, all_violations)
ෳͷݕࠪϧʔϧΛଋͶͯɺͭͷݕࠪϧʔϧʹ·ͱΊΔ
ʢ͜ͷྫͰɺੜҙؾͳίϝϯτΛݕࠪ͢Δϧʔϧ͚ͩʣ
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def lint(text):
node = parse_program(text)
if node is None:
return ["Syntax Error!"]
policies = Policies([NamaikiCommentPolicy()])
violations_buffer = []
def collect_violations(entered_node):
violations = policies.get_violations(entered_node)
violations_buffer.append(violations)
traverse(node, collect_violations)
all_violations = []
return reduce(add, violations_buffer, all_violations)
ݕࠪϝοηʔδΛूΊΔྻΛ४උ
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def lint(text):
node = parse_program(text)
if node is None:
return ["Syntax Error!"]
policies = Policies([NamaikiCommentPolicy()])
violations_buffer = []
def collect_violations(entered_node):
violations = policies.get_violations(entered_node)
violations_buffer.append(violations)
traverse(node, collect_violations)
all_violations = []
return reduce(add, violations_buffer, all_violations)
༩͑ΒΕͨநߏจͷϊʔυ͔ΒɺݕࠪϝοηʔδΛूΊΔؔ
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def lint(text):
node = parse_program(text)
if node is None:
return ["Syntax Error!"]
policies = Policies([NamaikiCommentPolicy()])
violations_buffer = []
def collect_violations(entered_node):
violations = policies.get_violations(entered_node)
violations_buffer.append(violations)
traverse(node, collect_violations)
all_violations = []
return reduce(add, violations_buffer, all_violations)
நߏจΛࠪͯ͠ɺݕࠪϝοηʔδΛूΊ͍ͯ͘
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def lint(text):
node = parse_program(text)
if node is None:
return ["Syntax Error!"]
policies = Policies([NamaikiCommentPolicy()])
violations_buffer = []
def collect_violations(entered_node):
violations = policies.get_violations(entered_node)
violations_buffer.append(violations)
traverse(node, collect_violations)
all_violations = []
return reduce(add, violations_buffer, all_violations)
ू·ͬͨݕࠪϝοηʔδΛͭͷྻʹ·ͱΊͯฦ͢
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text = "if isEmpty('') {\n// CATCH_ME_IF_YOU_CAN\n}\n"
violations = lint(text)
ෳͷݕࠪϧʔϧͰ੩తղੳͰ͖ΔΑ͏ʹͳͬͨ
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ݕࠪϧʔϧʹΑΔׂͷ·ͱΊ
w ੩తݕࠪͷݕࠪϧʔϧݸผͷίϯϙʔωϯτ
ͱ࣮ͯ͢͠Δͱอक͍͢͠
w ଟ͘ͷ੩తݕࠪπʔϧ͜ͷύλʔϯʹԊͬͯ
࣮͞Ε͍ͯΔ
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ଞʹ࣮ύλʔϯͨ͘͞Μ͋Δ͕ɺ
࣌ؒͷ߹ʢͱࠓͷମྗʣͰհ͖͠Εͳ͍
͞ΒʹΓ͍ͨํɺʮ7JNTDSJQUͷ-JOU࡞ऀʹ
ΑΔ୭ಘσβΠϯύλʔϯʯͱ͍͏هࣄΛࢀর
https://qiita.com/Kuniwak/items/d6a2d22711e4d7856edd
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࣮ࡍͷ੩తݕࠪπʔϧͷ
࣮ΛಡΜͰΈΑ͏
ීஈ͍ͬͯΔ
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1ZUIPO
w ߏจղੳث
w BTUQBSTFʢඪ४ϥΠϒϥϦʣ
w ࠪؔ
w BTU/PEF7JTJUPSʢඪ४ϥΠϒϥϦʣ
w ੩తݕࠪϧʔϧ
w $IFDLFS53:ʢQZqBLFTͷQZqBLTDIFDLFSQZʣ
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3VCZ
w ߏจղੳث
w 1BSTFS3VCZ
(JU)VCͷXIJUFRVBSLQBSTFSͷMJCQBSTFSSVCZZ
w ࠪؔ
w 3VCPDPQ"455SBWFSTBM
3VCPDPQͷMJCSVCPDPQBTUUSBWFSTBMSC
w ੩తݕࠪϧʔϧ
w 3VCPDPQ$PQ-JOU&NQUZ&OTVSF
3VCPDPQͷMJCSVCPDPQDPQMJOUFNQUZ@FOTVSFSC
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+BWB4DSJQU
w ߏจղੳث
w 1BSTFSʢ(JU)VCͷBDPSOKTBDPSOͷTSDTUBUFKT
w ࠪؔ
w 5SBWFSTFUSBWFSTF
&4-JOUͷMJCVUJMUSBWFSTFKT
w ੩తݕࠪϧʔϧ
w SVMFTOPFNQUZGVODUJPO
&4-JOUͷMJCSVMFTOPFNQUZGVODUJPOKT
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͜Ε·ͰͷࣝʹΑͬͯ
࡞ΕΔΑ͏ʹͳΔͷ
కΊ͘͘Γʹ
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ෳͷݕࠪϧʔϧʹΑΔ੩తݕࠪ
https://github.com/Kuniwak/Vint
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$44ͷநߏจΛൺֱ͢Δπʔϧ
https://github.com/mixi-inc/css-semdiff
$ css-astdiff a.css b.css --verbose
extra:
.extra-1 {
border: none;
}
missing:
.missing-1 {
border: none;
}
---------------------------------
1 extra rules and 1 missing rules
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؆қతͳߏจղੳͰґଘؔσʔλϕʔεΛ࡞
https://twitter.com/orga_chem/status/674847225684475905
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·ͱΊ
੩తղੳΛߏ͢Δجຊతͳߟ͑ํΛհɿ
w நߏจ
w ߏจղੳ
w ࠪؔ
w ݕࠪϧʔϧͷׂ
੩తղੳҙ֎ͱ؆୯ʹ࣮Ͱ͖·͢
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ࢀߟจݙ
͍·Ͳ͖ͷϓϩάϥϜݴޠͷ࡞ΓํʢஶSBOEZʣ
https://www.amazon.co.jp/dp/4839919232
.POBEJD1BSTFS$PNCJOBUPS
http://www.cs.nott.ac.uk/~pszgmh/monparsing.pdf
#
"