walt-compiler/src/generator/table.js

Alternative syntax for WebAssembly text format

// @flow
import Syntax from 'walt-syntax';
import walkNode from 'walt-parser-tools/walk-node';
import type { NodeType, IntermediateTableType } from './flow/types';

export default function generateMemory(node: NodeType): IntermediateTableType {
  const table = { max: 0, initial: 0, type: 'element' };

  walkNode({
    [Syntax.Pair]: ({ params }) => {
      // This could produce garbage values but that is a fault of the source code
      const [{ value: key }, { value }] = params;
      switch (key) {
        case 'initial':
          table.initial = parseInt(value);
          break;
        case 'element':
          table.type = value;
          break;
        case 'max':
          table.max = parseInt(value);
          break;
      }
    },
  })(node);

  return table;
}