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Original file line number | Diff line number | Diff line change |
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module.exports = pluginBabelBitDecorator; | ||
|
||
/** @param {{ types: import("@babel/types") }} api */ | ||
function pluginBabelBitDecorator({ types: t, template }) { | ||
const bodyTemplate = template.statement({ allowReturnOutsideFunction: true }); | ||
|
||
return { | ||
manipulateOptions({ parserOpts }) { | ||
parserOpts.plugins.push("decorators", "decoratorAutoAccessors"); | ||
}, | ||
visitor: { | ||
Class(path) { | ||
let storageField; | ||
let storageName; | ||
|
||
for (const element of path.get("body.body")) { | ||
if ( | ||
(element.isClassProperty() || element.isClassPrivateProperty()) && | ||
element.node.decorators?.some(dec => | ||
t.matchesPattern(dec.expression, "bit.storage") | ||
) | ||
) { | ||
element.node.decorators = element.node.decorators.filter( | ||
dec => !t.matchesPattern(dec.expression, "bit.storage") | ||
); | ||
storageField = element; | ||
storageName = element.node.key; | ||
break; | ||
} | ||
} | ||
|
||
let initial = 0; | ||
let nextMask = 1; | ||
|
||
for (const element of path.get("body.body")) { | ||
let dec; | ||
if ( | ||
element.isClassAccessorProperty() && | ||
(dec = element | ||
.get("decorators") | ||
?.find( | ||
({ node: dec }) => | ||
t.isIdentifier(dec.expression, { name: "bit" }) || | ||
(t.isCallExpression(dec.expression) && | ||
t.isIdentifier(dec.expression.callee, { name: "bit" })) | ||
)) | ||
) { | ||
if (element.node.static || t.isPrivateName(element.node.key)) { | ||
throw element.buildCodeFrameError( | ||
"@bit cannot be used on static or private fields" | ||
); | ||
} | ||
if (element.node.decorators.length > 1) { | ||
throw element.buildCodeFrameError( | ||
"@bit cannot be used with other decorators" | ||
); | ||
} | ||
if (!t.isBooleanLiteral(element.node.value)) { | ||
throw element.buildCodeFrameError( | ||
"@bit fields must be initialized to a boolean literal" | ||
); | ||
} | ||
if (!storageName) { | ||
throw path.buildCodeFrameError( | ||
"Cannot use @bit withuot also declaring a @bit.storage field" | ||
); | ||
} | ||
if (nextMask === 0) { | ||
// overflow | ||
throw path.buildCodeFrameError( | ||
"A class can contain at most 32 @bit decorators" | ||
); | ||
} | ||
|
||
let val; | ||
if ( | ||
t.isCallExpression(dec.node.expression) && | ||
dec.node.expression.arguments.length > 0 && | ||
(val = dec.get("expression.arguments.0").evaluate().value) !== | ||
nextMask | ||
) { | ||
throw dec.buildCodeFrameError( | ||
`Bit mask is ${nextMask.toString(2)}, but found ${val?.toString(2)} (or couldn't evaluate)` | ||
); | ||
} | ||
|
||
if (element.node.value.value) { | ||
initial |= nextMask; | ||
} | ||
|
||
element.replaceWithMultiple([ | ||
t.classMethod( | ||
"get", | ||
element.node.key, | ||
[], | ||
bodyTemplate.ast`{ | ||
return ( | ||
this.${t.cloneNode(storageName)} & ${t.numericLiteral(nextMask)} | ||
) > 0; | ||
}` | ||
), | ||
t.classMethod( | ||
"set", | ||
element.node.key, | ||
[t.identifier("v")], | ||
bodyTemplate.ast`{ | ||
if (v) this.${t.cloneNode(storageName)} |= ${t.numericLiteral(nextMask)}; | ||
else this.${t.cloneNode(storageName)} &= ${t.valueToNode(~nextMask)}; | ||
}` | ||
), | ||
]); | ||
|
||
nextMask <<= 1; | ||
} | ||
} | ||
|
||
if (storageField) { | ||
storageField.node.value = t.numericLiteral(initial); | ||
} | ||
}, | ||
}, | ||
}; | ||
} |
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