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