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<a href="../../index.html">All files</a> / <a href="index.html">src/generator</a> import.js
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">// @flow
import Syntax from 'walt-syntax';
import walkNode from 'walt-parser-tools/walk-node';
import { stringToType } from '../emitter/value_type';
import { parseBounds } from '../utils/resizable-limits';
import {
EXTERN_FUNCTION,
EXTERN_MEMORY,
EXTERN_GLOBAL,
EXTERN_TABLE,
} from '../emitter/external_kind';
import { TYPE_INDEX } from '../semantics/metadata';
import type { IntermediateImportType, NodeType } from './flow/types';
export const getKindConstant = (value: string) => {
switch (value) {
case 'Memory':
return EXTERN_MEMORY;
case 'Table':
return EXTERN_TABLE;
case 'i32':
case 'f32':
case 'i64':
case 'f64':
return EXTERN_GLOBAL;
default:
return EXTERN_FUNCTION;
}
};
const getFieldName = node => {
let name = node.value;
if (node.meta.AS != null) {
return node.meta.AS;
}
return name;
};
export default function generateImportFromNode(
node: NodeType
): IntermediateImportType[] {
const [importsNode, moduleStringLiteralNode] = node.params;
const { value: module } = moduleStringLiteralNode;
const imports: IntermediateImportType[] = [];
// Look for Pair Types, encode them into imports array
walkNode({
[Syntax.Pair]: (pairNode, _) => {
const [fieldIdentifierNode, typeOrIdentifierNode] = pairNode.params;
const field = getFieldName(fieldIdentifierNode);
const { value: importTypeValue } = typeOrIdentifierNode;
const kind = getKindConstant(importTypeValue);
const typeIndex = (() => {
const typeIndexMeta = typeOrIdentifierNode.meta[TYPE_INDEX];
if (typeIndexMeta) {
return typeIndexMeta;
}
return null;
})();
const bounds =
importTypeValue === 'Memory' ? parseBounds(typeOrIdentifierNode) : {};
imports.push({
module,
field,
global: kind === EXTERN_GLOBAL,
kind,
type: stringToType[importTypeValue],
typeIndex,
...bounds,
});
},
})(importsNode);
return imports;
}
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