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refactor build() to simplify the duck-typing logic
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,104 @@ | ||
| const React = require("react"); | ||
| const isAnimated = require("../isAnimated"); | ||
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| // infer the uniform value type and validate it (throw error if invalid) | ||
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| module.exports = function (obj) { | ||
| let typ = typeof obj; | ||
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| if (typ==="number") { | ||
| if(isNaN(obj) || !isFinite(obj)) throw new Error("invalid number: '"+obj+"'"); | ||
| return typ; | ||
| } | ||
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| if (typ==="boolean") { | ||
| return typ; | ||
| } | ||
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| if (typ==="string") { | ||
| return typ; | ||
| } | ||
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| if (typ==="undefined") { | ||
| return null; | ||
| } | ||
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| if (typ === "object") { | ||
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| if (!obj) { | ||
| return null; | ||
| } | ||
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| if (typeof obj.uri === "string") { | ||
| return "{uri}"; | ||
| } | ||
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| if (obj.data && obj.shape && obj.stride) { | ||
| return "ndarray"; | ||
| } | ||
|
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| if (obj instanceof Array) { | ||
| const length = obj.length; | ||
| if (!length) throw new Error("array is empty"); | ||
| let foundAnimated = false; | ||
| let foundVDOM = false; | ||
| let foundNumber = false; | ||
| let foundBoolean = false; | ||
| for (let i=0; i<length; i++) { | ||
| const val = obj[i]; | ||
| const t = typeof val; | ||
| switch (t) { | ||
| case "object": | ||
| if (val && isAnimated(val)) | ||
| foundAnimated = true; | ||
| else if (val && React.isValidElement(val)) | ||
| foundVDOM = true; | ||
| else | ||
| throw new Error("at index "+i+", Unrecognized object: '"+val+"'"); | ||
| break; | ||
|
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| case "number": | ||
| if(isNaN(val) || !isFinite(val)) | ||
| throw new Error("at index "+i+", invalid number: '"+val+"'"); | ||
| foundNumber = true; | ||
| break; | ||
|
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| case "boolean": | ||
| foundBoolean = true; | ||
| break; | ||
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| default: | ||
| throw new Error("at index "+i+", Unrecognized object: "+val); | ||
| } | ||
| } | ||
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| const foundNumberOrBooleanOrAnimated = foundNumber || foundBoolean || foundAnimated; | ||
| if (foundNumberOrBooleanOrAnimated && foundVDOM) { | ||
| throw new Error("Invalid array. Found both VDOM value and numbers/booleans/animated"); | ||
| } | ||
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| if (foundVDOM) { | ||
| return "vdom[]"; | ||
| } | ||
| if (foundAnimated) { | ||
| return "animated[]"; | ||
| } | ||
| if (foundNumber) { | ||
| return "number[]"; | ||
| } | ||
| if (foundBoolean) { | ||
| return "boolean[]"; | ||
| } | ||
| } | ||
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| if (isAnimated(obj)) { | ||
| return "animated"; | ||
| } | ||
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| if (React.isValidElement(obj)) { | ||
| return "vdom"; | ||
| } | ||
| } | ||
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| throw new Error("Unrecognized object: "+obj); | ||
| }; |
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