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index.js
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Mon, Nov 18, 15:42

index.js
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import { decode } from "@webassemblyjs/wasm-parser";
import { traverse } from "@webassemblyjs/ast";
import { cloneNode } from "@webassemblyjs/ast/lib/clone";
import { shrinkPaddedLEB128 } from "@webassemblyjs/wasm-opt";
import { getSectionForNode } from "@webassemblyjs/helper-wasm-bytecode";
import constants from "@webassemblyjs/helper-wasm-bytecode";
import { applyOperations } from "./apply";
function hashNode(node) {
return JSON.stringify(node);
}
function preprocess(ab) {
var optBin = shrinkPaddedLEB128(new Uint8Array(ab));
return optBin.buffer;
}
function sortBySectionOrder(nodes) {
var originalOrder = new Map();
var _iteratorNormalCompletion = true;
var _didIteratorError = false;
var _iteratorError = undefined;
try {
for (var _iterator = nodes[Symbol.iterator](), _step; !(_iteratorNormalCompletion = (_step = _iterator.next()).done); _iteratorNormalCompletion = true) {
var _node = _step.value;
originalOrder.set(_node, originalOrder.size);
}
} catch (err) {
_didIteratorError = true;
_iteratorError = err;
} finally {
try {
if (!_iteratorNormalCompletion && _iterator.return != null) {
_iterator.return();
}
} finally {
if (_didIteratorError) {
throw _iteratorError;
}
}
}
nodes.sort(function (a, b) {
var sectionA = getSectionForNode(a);
var sectionB = getSectionForNode(b);
var aId = constants.sections[sectionA];
var bId = constants.sections[sectionB];
if (typeof aId !== "number" || typeof bId !== "number") {
throw new Error("Section id not found");
}
if (aId === bId) {
// $FlowIgnore originalOrder is filled for all nodes
return originalOrder.get(a) - originalOrder.get(b);
}
return aId - bId;
});
}
export function edit(ab, visitors) {
ab = preprocess(ab);
var ast = decode(ab);
return editWithAST(ast, ab, visitors);
}
export function editWithAST(ast, ab, visitors) {
var operations = [];
var uint8Buffer = new Uint8Array(ab);
var nodeBefore;
function before(type, path) {
nodeBefore = cloneNode(path.node);
}
function after(type, path) {
if (path.node._deleted === true) {
operations.push({
kind: "delete",
node: path.node
}); // $FlowIgnore
} else if (hashNode(nodeBefore) !== hashNode(path.node)) {
operations.push({
kind: "update",
oldNode: nodeBefore,
node: path.node
});
}
}
traverse(ast, visitors, before, after);
uint8Buffer = applyOperations(ast, uint8Buffer, operations);
return uint8Buffer.buffer;
}
export function add(ab, newNodes) {
ab = preprocess(ab);
var ast = decode(ab);
return addWithAST(ast, ab, newNodes);
}
export function addWithAST(ast, ab, newNodes) {
// Sort nodes by insertion order
sortBySectionOrder(newNodes);
var uint8Buffer = new Uint8Array(ab); // Map node into operations
var operations = newNodes.map(function (n) {
return {
kind: "add",
node: n
};
});
uint8Buffer = applyOperations(ast, uint8Buffer, operations);
return uint8Buffer.buffer;
}

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