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Pipeline Operator proposal (#742)

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This commit is contained in:
Henry Zhu 2017-09-28 23:13:41 -04:00 committed by GitHub
parent 18c6b4e3e9
commit d2e06a9496
22 changed files with 968 additions and 3 deletions
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1
README.md
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@ -149,6 +149,7 @@ require("babylon").parse("code", {
| `bigInt` ([proposal](https://github.com/tc39/proposal-bigint)) | `100n` |
| `optionalCatchBinding` ([proposal](https://github.com/babel/proposals/issues/7)) | `try {throw 0;} catch{do();}` |
| `throwExpressions` ([proposal](https://github.com/babel/proposals/issues/23)) | `() => throw new Error("")` |
| `pipelineOperator` ([proposal](https://github.com/babel/proposals/issues/29)) | `a |> b` |
### FAQ

1
ast/spec.md
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@ -790,6 +790,7 @@ enum BinaryOperator {
| "+" | "-" | "*" | "/" | "%"
| "|" | "^" | "&" | "in"
| "instanceof"
| "|>"
}
```

7
src/parser/expression.js
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@ -290,6 +290,13 @@ export default class ExpressionParser extends LValParser {
const startPos = this.state.start;
const startLoc = this.state.startLoc;
if (node.operator === "|>") {
this.expectPlugin("pipelineOperator");
// Support syntax such as 10 |> x => x + 1
this.state.potentialArrowAt = startPos;
}
node.right = this.parseExprOp(
this.parseMaybeUnary(),
startPos,

11
src/tokenizer/index.js
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@ -453,9 +453,16 @@ export default class Tokenizer extends LocationParser {
const next = this.input.charCodeAt(this.state.pos + 1);
if (next === code)
return this.finishOp(code === 124 ? tt.logicalOR : tt.logicalAND, 2);
if (code === 124) {
// '|>'
if (next === 62) {
return this.finishOp(tt.pipeline, 2);
} else if (next === 125 && this.hasPlugin("flow")) {
// '|}'
return this.finishOp(tt.braceBarR, 2);
}
}
if (next === 61) return this.finishOp(tt.assign, 2);
if (code === 124 && next === 125 && this.hasPlugin("flow"))
return this.finishOp(tt.braceBarR, 2);
return this.finishOp(code === 124 ? tt.bitwiseOR : tt.bitwiseAND, 1);
}

3
src/tokenizer/types.js
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@ -61,7 +61,7 @@ export class TokenType {
this.isAssign = !!conf.isAssign;
this.prefix = !!conf.prefix;
this.postfix = !!conf.postfix;
this.binop = conf.binop || null;
this.binop = conf.binop === 0 ? 0 : conf.binop || null;
this.updateContext = null;
}
}
@ -131,6 +131,7 @@ export const types: { [name: string]: TokenType } = {
incDec: new TokenType("++/--", { prefix, postfix, startsExpr }),
bang: new TokenType("!", { beforeExpr, prefix, startsExpr }),
tilde: new TokenType("~", { beforeExpr, prefix, startsExpr }),
pipeline: new BinopTokenType("|>", 0),
logicalOR: new BinopTokenType("||", 1),
logicalAND: new BinopTokenType("&&", 2),
bitwiseOR: new BinopTokenType("|", 3),

1
test/fixtures/experimental/pipeline-operator/base/actual.js vendored Normal file
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@ -0,0 +1 @@
a |> b

99
test/fixtures/experimental/pipeline-operator/base/expected.json vendored Normal file
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@ -0,0 +1,99 @@
{
"type": "File",
"start": 0,
"end": 6,
"loc": {
"start": {
"line": 1,
"column": 0
},
"end": {
"line": 1,
"column": 6
}
},
"program": {
"type": "Program",
"start": 0,
"end": 6,
"loc": {
"start": {
"line": 1,
"column": 0
},
"end": {
"line": 1,
"column": 6
}
},
"sourceType": "script",
"body": [
{
"type": "ExpressionStatement",
"start": 0,
"end": 6,
"loc": {
"start": {
"line": 1,
"column": 0
},
"end": {
"line": 1,
"column": 6
}
},
"expression": {
"type": "BinaryExpression",
"start": 0,
"end": 6,
"loc": {
"start": {
"line": 1,
"column": 0
},
"end": {
"line": 1,
"column": 6
}
},
"left": {
"type": "Identifier",
"start": 0,
"end": 1,
"loc": {
"start": {
"line": 1,
"column": 0
},
"end": {
"line": 1,
"column": 1
},
"identifierName": "a"
},
"name": "a"
},
"operator": "|>",
"right": {
"type": "Identifier",
"start": 5,
"end": 6,
"loc": {
"start": {
"line": 1,
"column": 5
},
"end": {
"line": 1,
"column": 6
},
"identifierName": "b"
},
"name": "b"
}
}
}
],
"directives": []
}
}

3
test/fixtures/experimental/pipeline-operator/base/options.json vendored Normal file
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@ -0,0 +1,3 @@
{
"plugins": ["pipelineOperator"]
}

1
test/fixtures/experimental/pipeline-operator/chain/actual.js vendored Normal file
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@ -0,0 +1 @@
x => x |> inc |> double

170
test/fixtures/experimental/pipeline-operator/chain/expected.json vendored Normal file
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@ -0,0 +1,170 @@
{
"type": "File",
"start": 0,
"end": 23,
"loc": {
"start": {
"line": 1,
"column": 0
},
"end": {
"line": 1,
"column": 23
}
},
"program": {
"type": "Program",
"start": 0,
"end": 23,
"loc": {
"start": {
"line": 1,
"column": 0
},
"end": {
"line": 1,
"column": 23
}
},
"sourceType": "script",
"body": [
{
"type": "ExpressionStatement",
"start": 0,
"end": 23,
"loc": {
"start": {
"line": 1,
"column": 0
},
"end": {
"line": 1,
"column": 23
}
},
"expression": {
"type": "ArrowFunctionExpression",
"start": 0,
"end": 23,
"loc": {
"start": {
"line": 1,
"column": 0
},
"end": {
"line": 1,
"column": 23
}
},
"id": null,
"generator": false,
"expression": true,
"async": false,
"params": [
{
"type": "Identifier",
"start": 0,
"end": 1,
"loc": {
"start": {
"line": 1,
"column": 0
},
"end": {
"line": 1,
"column": 1
},
"identifierName": "x"
},
"name": "x"
}
],
"body": {
"type": "BinaryExpression",
"start": 5,
"end": 23,
"loc": {
"start": {
"line": 1,
"column": 5
},
"end": {
"line": 1,
"column": 23
}
},
"left": {
"type": "BinaryExpression",
"start": 5,
"end": 13,
"loc": {
"start": {
"line": 1,
"column": 5
},
"end": {
"line": 1,
"column": 13
}
},
"left": {
"type": "Identifier",
"start": 5,
"end": 6,
"loc": {
"start": {
"line": 1,
"column": 5
},
"end": {
"line": 1,
"column": 6
},
"identifierName": "x"
},
"name": "x"
},
"operator": "|>",
"right": {
"type": "Identifier",
"start": 10,
"end": 13,
"loc": {
"start": {
"line": 1,
"column": 10
},
"end": {
"line": 1,
"column": 13
},
"identifierName": "inc"
},
"name": "inc"
}
},
"operator": "|>",
"right": {
"type": "Identifier",
"start": 17,
"end": 23,
"loc": {
"start": {
"line": 1,
"column": 17
},
"end": {
"line": 1,
"column": 23
},
"identifierName": "double"
},
"name": "double"
}
}
}
}
],
"directives": []
}
}

3
test/fixtures/experimental/pipeline-operator/chain/options.json vendored Normal file
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@ -0,0 +1,3 @@
{
"plugins": ["pipelineOperator"]
}

4
test/fixtures/experimental/pipeline-operator/multiline/actual.js vendored Normal file
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@ -0,0 +1,4 @@
let result = "hello"
|> doubleSay
|> capitalize
|> exclaim;

203
test/fixtures/experimental/pipeline-operator/multiline/expected.json vendored Normal file
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@ -0,0 +1,203 @@
{
"type": "File",
"start": 0,
"end": 65,
"loc": {
"start": {
"line": 1,
"column": 0
},
"end": {
"line": 4,
"column": 13
}
},
"program": {
"type": "Program",
"start": 0,
"end": 65,
"loc": {
"start": {
"line": 1,
"column": 0
},
"end": {
"line": 4,
"column": 13
}
},
"sourceType": "script",
"body": [
{
"type": "VariableDeclaration",
"start": 0,
"end": 65,
"loc": {
"start": {
"line": 1,
"column": 0
},
"end": {
"line": 4,
"column": 13
}
},
"declarations": [
{
"type": "VariableDeclarator",
"start": 4,
"end": 64,
"loc": {
"start": {
"line": 1,
"column": 4
},
"end": {
"line": 4,
"column": 12
}
},
"id": {
"type": "Identifier",
"start": 4,
"end": 10,
"loc": {
"start": {
"line": 1,
"column": 4
},
"end": {
"line": 1,
"column": 10
},
"identifierName": "result"
},
"name": "result"
},
"init": {
"type": "BinaryExpression",
"start": 13,
"end": 64,
"loc": {
"start": {
"line": 1,
"column": 13
},
"end": {
"line": 4,
"column": 12
}
},
"left": {
"type": "BinaryExpression",
"start": 13,
"end": 51,
"loc": {
"start": {
"line": 1,
"column": 13
},
"end": {
"line": 3,
"column": 15
}
},
"left": {
"type": "BinaryExpression",
"start": 13,
"end": 35,
"loc": {
"start": {
"line": 1,
"column": 13
},
"end": {
"line": 2,
"column": 14
}
},
"left": {
"type": "StringLiteral",
"start": 13,
"end": 20,
"loc": {
"start": {
"line": 1,
"column": 13
},
"end": {
"line": 1,
"column": 20
}
},
"extra": {
"rawValue": "hello",
"raw": "\"hello\""
},
"value": "hello"
},
"operator": "|>",
"right": {
"type": "Identifier",
"start": 26,
"end": 35,
"loc": {
"start": {
"line": 2,
"column": 5
},
"end": {
"line": 2,
"column": 14
},
"identifierName": "doubleSay"
},
"name": "doubleSay"
}
},
"operator": "|>",
"right": {
"type": "Identifier",
"start": 41,
"end": 51,
"loc": {
"start": {
"line": 3,
"column": 5
},
"end": {
"line": 3,
"column": 15
},
"identifierName": "capitalize"
},
"name": "capitalize"
}
},
"operator": "|>",
"right": {
"type": "Identifier",
"start": 57,
"end": 64,
"loc": {
"start": {
"line": 4,
"column": 5
},
"end": {
"line": 4,
"column": 12
},
"identifierName": "exclaim"
},
"name": "exclaim"
}
}
}
],
"kind": "let"
}
],
"directives": []
}
}

3
test/fixtures/experimental/pipeline-operator/multiline/options.json vendored Normal file
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@ -0,0 +1,3 @@
{
"plugins": ["pipelineOperator"]
}

1
test/fixtures/experimental/pipeline-operator/no-plugin/actual.js vendored Normal file
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@ -0,0 +1 @@
a |> b

3
test/fixtures/experimental/pipeline-operator/no-plugin/options.json vendored Normal file
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@ -0,0 +1,3 @@
{
"throws": "This experimental syntax requires enabling the parser plugin: 'pipelineOperator' (1:5)"
}

2
test/fixtures/experimental/pipeline-operator/precedence/actual.js vendored Normal file
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@ -0,0 +1,2 @@
4 || 9 |> inc;
10 |> f || h |> inc

272
test/fixtures/experimental/pipeline-operator/precedence/expected.json vendored Normal file
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@ -0,0 +1,272 @@
{
"type": "File",
"start": 0,
"end": 34,
"loc": {
"start": {
"line": 1,
"column": 0
},
"end": {
"line": 2,
"column": 19
}
},
"program": {
"type": "Program",
"start": 0,
"end": 34,
"loc": {
"start": {
"line": 1,
"column": 0
},
"end": {
"line": 2,
"column": 19
}
},
"sourceType": "script",
"body": [
{
"type": "ExpressionStatement",
"start": 0,
"end": 14,
"loc": {
"start": {
"line": 1,
"column": 0
},
"end": {
"line": 1,
"column": 14
}
},
"expression": {
"type": "BinaryExpression",
"start": 0,
"end": 13,
"loc": {
"start": {
"line": 1,
"column": 0
},
"end": {
"line": 1,
"column": 13
}
},
"left": {
"type": "LogicalExpression",
"start": 0,
"end": 6,
"loc": {
"start": {
"line": 1,
"column": 0
},
"end": {
"line": 1,
"column": 6
}
},
"left": {
"type": "NumericLiteral",
"start": 0,
"end": 1,
"loc": {
"start": {
"line": 1,
"column": 0
},
"end": {
"line": 1,
"column": 1
}
},
"extra": {
"rawValue": 4,
"raw": "4"
},
"value": 4
},
"operator": "||",
"right": {
"type": "NumericLiteral",
"start": 5,
"end": 6,
"loc": {
"start": {
"line": 1,
"column": 5
},
"end": {
"line": 1,
"column": 6
}
},
"extra": {
"rawValue": 9,
"raw": "9"
},
"value": 9
}
},
"operator": "|>",
"right": {
"type": "Identifier",
"start": 10,
"end": 13,
"loc": {
"start": {
"line": 1,
"column": 10
},
"end": {
"line": 1,
"column": 13
},
"identifierName": "inc"
},
"name": "inc"
}
}
},
{
"type": "ExpressionStatement",
"start": 15,
"end": 34,
"loc": {
"start": {
"line": 2,
"column": 0
},
"end": {
"line": 2,
"column": 19
}
},
"expression": {
"type": "BinaryExpression",
"start": 15,
"end": 34,
"loc": {
"start": {
"line": 2,
"column": 0
},
"end": {
"line": 2,
"column": 19
}
},
"left": {
"type": "BinaryExpression",
"start": 15,
"end": 27,
"loc": {
"start": {
"line": 2,
"column": 0
},
"end": {
"line": 2,
"column": 12
}
},
"left": {
"type": "NumericLiteral",
"start": 15,
"end": 17,
"loc": {
"start": {
"line": 2,
"column": 0
},
"end": {
"line": 2,
"column": 2
}
},
"extra": {
"rawValue": 10,
"raw": "10"
},
"value": 10
},
"operator": "|>",
"right": {
"type": "LogicalExpression",
"start": 21,
"end": 27,
"loc": {
"start": {
"line": 2,
"column": 6
},
"end": {
"line": 2,
"column": 12
}
},
"left": {
"type": "Identifier",
"start": 21,
"end": 22,
"loc": {
"start": {
"line": 2,
"column": 6
},
"end": {
"line": 2,
"column": 7
},
"identifierName": "f"
},
"name": "f"
},
"operator": "||",
"right": {
"type": "Identifier",
"start": 26,
"end": 27,
"loc": {
"start": {
"line": 2,
"column": 11
},
"end": {
"line": 2,
"column": 12
},
"identifierName": "h"
},
"name": "h"
}
}
},
"operator": "|>",
"right": {
"type": "Identifier",
"start": 31,
"end": 34,
"loc": {
"start": {
"line": 2,
"column": 16
},
"end": {
"line": 2,
"column": 19
},
"identifierName": "inc"
},
"name": "inc"
}
}
}
],
"directives": []
}
}

3
test/fixtures/experimental/pipeline-operator/precedence/options.json vendored Normal file
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@ -0,0 +1,3 @@
{
"plugins": ["pipelineOperator"]
}

1
test/fixtures/experimental/pipeline-operator/with-arrow/actual.js vendored Normal file
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@ -0,0 +1 @@
10 |> x => x + 1;

176
test/fixtures/experimental/pipeline-operator/with-arrow/expected.json vendored Normal file
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@ -0,0 +1,176 @@
{
"type": "File",
"start": 0,
"end": 17,
"loc": {
"start": {
"line": 1,
"column": 0
},
"end": {
"line": 1,
"column": 17
}
},
"program": {
"type": "Program",
"start": 0,
"end": 17,
"loc": {
"start": {
"line": 1,
"column": 0
},
"end": {
"line": 1,
"column": 17
}
},
"sourceType": "script",
"body": [
{
"type": "ExpressionStatement",
"start": 0,
"end": 17,
"loc": {
"start": {
"line": 1,
"column": 0
},
"end": {
"line": 1,
"column": 17
}
},
"expression": {
"type": "BinaryExpression",
"start": 0,
"end": 16,
"loc": {
"start": {
"line": 1,
"column": 0
},
"end": {
"line": 1,
"column": 16
}
},
"left": {
"type": "NumericLiteral",
"start": 0,
"end": 2,
"loc": {
"start": {
"line": 1,
"column": 0
},
"end": {
"line": 1,
"column": 2
}
},
"extra": {
"rawValue": 10,
"raw": "10"
},
"value": 10
},
"operator": "|>",
"right": {
"type": "ArrowFunctionExpression",
"start": 6,
"end": 16,
"loc": {
"start": {
"line": 1,
"column": 6
},
"end": {
"line": 1,
"column": 16
}
},
"id": null,
"generator": false,
"expression": true,
"async": false,
"params": [
{
"type": "Identifier",
"start": 6,
"end": 7,
"loc": {
"start": {
"line": 1,
"column": 6
},
"end": {
"line": 1,
"column": 7
},
"identifierName": "x"
},
"name": "x"
}
],
"body": {
"type": "BinaryExpression",
"start": 11,
"end": 16,
"loc": {
"start": {
"line": 1,
"column": 11
},
"end": {
"line": 1,
"column": 16
}
},
"left": {
"type": "Identifier",
"start": 11,
"end": 12,
"loc": {
"start": {
"line": 1,
"column": 11
},
"end": {
"line": 1,
"column": 12
},
"identifierName": "x"
},
"name": "x"
},
"operator": "+",
"right": {
"type": "NumericLiteral",
"start": 15,
"end": 16,
"loc": {
"start": {
"line": 1,
"column": 15
},
"end": {
"line": 1,
"column": 16
}
},
"extra": {
"rawValue": 1,
"raw": "1"
},
"value": 1
}
}
}
}
}
],
"directives": []
}
}

3
test/fixtures/experimental/pipeline-operator/with-arrow/options.json vendored Normal file
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@ -0,0 +1,3 @@
{
"plugins": ["pipelineOperator"]
}