walt-compiler
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Alternative syntax for WebAssembly text format
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<title>Code coverage report for src/plugin/index.js</title>
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<a href="../../index.html">All files</a> / <a href="index.html">src/plugin</a> index.js
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">// Return a single method which will chain all of the middleware provided
const combineMiddleware = transforms => {
let transform;
const chain = transforms.reduce((stack, go) => {
return go(args => {
// Each middleware get's a node and context object. The context allows for
// nested node to have knowledge of the outer/parent context. All of this is
// part of args array
return stack(args, transform);
});
// unroll last result
}, ([id]) => id);
return (args, topLevelTranfrom) => {
transform = topLevelTranfrom;
// kick off the chain of middleware, starting from right to left
return chain(args, transform);
};
};
export const combineParsers = sortedParsers => {
const wildcards = [];
// Normalize parsers by type
const parsersByType = sortedParsers.reduce((acc, parser) => {
Object.entries(parser).forEach(([type, cb]) => {
// Wildcards may only handle types which have other callbacks attached to
// them.
if (type === '*') {
wildcards.push(cb);
return;
}
if (acc[type] == null) {
// Prepend any previously defined wildcard to maintain precedence
acc[type] = [...wildcards];
}
acc[type].push(cb);
});
return acc;
}, {});
return Object.entries(parsersByType).reduce((acc, [key, transforms]) => {
acc[key] = combineMiddleware(transforms);
return acc;
}, {});
};
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