text: function _sliceIterator(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i["return"] != null) _i["return"](); } finally { if (_d) throw _e; } } return _arr; }
  
  function _slicedToArray(arr, i) { if (Array.isArray(arr)) { return arr; } else if (Symbol.iterator in Object(arr)) { return _sliceIterator(arr, i); } else { throw new TypeError("Invalid attempt to destructure non-iterable instance"); } }
  
  import { encodeNode } from "@webassemblyjs/wasm-gen";
  import { encodeU32 } from "@webassemblyjs/wasm-gen/lib/encoder";
  import { isFunc, isGlobal, assertHasLoc, orderedInsertNode, getSectionMetadata, traverse, getEndOfSection } from "@webassemblyjs/ast";
  import { resizeSectionByteSize, resizeSectionVecSize, createEmptySection, removeSections } from "@webassemblyjs/helper-wasm-section";
  import { overrideBytesInBuffer } from "@webassemblyjs/helper-buffer";
  import { getSectionForNode } from "@webassemblyjs/helper-wasm-bytecode";
  
  function shiftLocNodeByDelta(node, delta) {
    assertHasLoc(node); // $FlowIgnore: assertHasLoc ensures that
  
    node.loc.start.column += delta; // $FlowIgnore: assertHasLoc ensures that
  
    node.loc.end.column += delta;
  }
  
  function applyUpdate(ast, uint8Buffer, _ref) {
    var _ref2 = _slicedToArray(_ref, 2),
        oldNode = _ref2[0],
        newNode = _ref2[1];
  
    var deltaElements = 0;
    assertHasLoc(oldNode);
    var sectionName = getSectionForNode(newNode);
    var replacementByteArray = encodeNode(newNode);
    /**
     * Replace new node as bytes
     */
  
    uint8Buffer = overrideBytesInBuffer(uint8Buffer, // $FlowIgnore: assertHasLoc ensures that
    oldNode.loc.start.column, // $FlowIgnore: assertHasLoc ensures that
    oldNode.loc.end.column, replacementByteArray);
    /**
     * Update function body size if needed
     */
  
    if (sectionName === "code") {
      // Find the parent func
      traverse(ast, {
        Func: function Func(_ref3) {
          var node = _ref3.node;
          var funcHasThisIntr = node.body.find(function (n) {
            return n === newNode;
          }) !== undefined; // Update func's body size if needed
  
          if (funcHasThisIntr === true) {
            // These are the old functions locations informations
            assertHasLoc(node);
            var oldNodeSize = encodeNode(oldNode).length;
            var bodySizeDeltaBytes = replacementByteArray.length - oldNodeSize;
  
            if (bodySizeDeltaBytes !== 0) {
              var newValue = node.metadata.bodySize + bodySizeDeltaBytes;
              var newByteArray = encodeU32(newValue); // function body size byte
              // FIXME(sven): only handles one byte u32
  
              var start = node.loc.start.column;
              var end = start + 1;
              uint8Buffer = overrideBytesInBuffer(uint8Buffer, start, end, newByteArray);
            }
          }
        }
      });
    }
    /**
     * Update section size
     */
  
  
    var deltaBytes = replacementByteArray.length - ( // $FlowIgnore: assertHasLoc ensures that
    oldNode.loc.end.column - oldNode.loc.start.column); // Init location informations
  
    newNode.loc = {
      start: {
        line: -1,
        column: -1
      },
      end: {
        line: -1,
        column: -1
      }
    }; // Update new node end position
    // $FlowIgnore: assertHasLoc ensures that
  
    newNode.loc.start.column = oldNode.loc.start.column; // $FlowIgnore: assertHasLoc ensures that
  
    newNode.loc.end.column = // $FlowIgnore: assertHasLoc ensures that
    oldNode.loc.start.column + replacementByteArray.length;
    return {
      uint8Buffer: uint8Buffer,
      deltaBytes: deltaBytes,
      deltaElements: deltaElements
    };
  }
  
  function applyDelete(ast, uint8Buffer, node) {
    var deltaElements = -1; // since we removed an element
  
    assertHasLoc(node);
    var sectionName = getSectionForNode(node);
  
    if (sectionName === "start") {
      var sectionMetadata = getSectionMetadata(ast, "start");
      /**
       * The start section only contains one element,
       * we need to remove the whole section
       */
  
      uint8Buffer = removeSections(ast, uint8Buffer, "start");
  
      var _deltaBytes = -(sectionMetadata.size.value + 1);
      /* section id */
  
  
      return {
        uint8Buffer: uint8Buffer,
        deltaBytes: _deltaBytes,
        deltaElements: deltaElements
      };
    } // replacement is nothing
  
  
    var replacement = [];
    uint8Buffer = overrideBytesInBuffer(uint8Buffer, // $FlowIgnore: assertHasLoc ensures that
    node.loc.start.column, // $FlowIgnore: assertHasLoc ensures that
    node.loc.end.column, replacement);
    /**
     * Update section
     */
    // $FlowIgnore: assertHasLoc ensures that
  
    var deltaBytes = -(node.loc.end.column - node.loc.start.column);
    return {
      uint8Buffer: uint8Buffer,
      deltaBytes: deltaBytes,
      deltaElements: deltaElements
    };
  }
  
  function applyAdd(ast, uint8Buffer, node) {
    var deltaElements = +1; // since we added an element
  
    var sectionName = getSectionForNode(node);
    var sectionMetadata = getSectionMetadata(ast, sectionName); // Section doesn't exists, we create an empty one
  
    if (typeof sectionMetadata === "undefined") {
      var res = createEmptySection(ast, uint8Buffer, sectionName);
      uint8Buffer = res.uint8Buffer;
      sectionMetadata = res.sectionMetadata;
    }
    /**
     * check that the expressions were ended
     */
  
  
    if (isFunc(node)) {
      // $FlowIgnore
      var body = node.body;
  
      if (body.length === 0 || body[body.length - 1].id !== "end") {
        throw new Error("expressions must be ended");
      }
    }
  
    if (isGlobal(node)) {
      // $FlowIgnore
      var body = node.init;
  
      if (body.length === 0 || body[body.length - 1].id !== "end") {
        throw new Error("expressions must be ended");
      }
    }
    /**
     * Add nodes
     */
  
  
    var newByteArray = encodeNode(node); // The size of the section doesn't include the storage of the size itself
    // we need to manually add it here
  
    var start = getEndOfSection(sectionMetadata);
    var end = start;
    /**
     * Update section
     */
  
    var deltaBytes = newByteArray.length;
    uint8Buffer = overrideBytesInBuffer(uint8Buffer, start, end, newByteArray);
    node.loc = {
      start: {
        line: -1,
        column: start
      },
      end: {
        line: -1,
        column: start + deltaBytes
      }
    }; // for func add the additional metadata in the AST
  
    if (node.type === "Func") {
      // the size is the first byte
      // FIXME(sven): handle LEB128 correctly here
      var bodySize = newByteArray[0];
      node.metadata = {
        bodySize: bodySize
      };
    }
  
    if (node.type !== "IndexInFuncSection") {
      orderedInsertNode(ast.body[0], node);
    }
  
    return {
      uint8Buffer: uint8Buffer,
      deltaBytes: deltaBytes,
      deltaElements: deltaElements
    };
  }
  
  export function applyOperations(ast, uint8Buffer, ops) {
    ops.forEach(function (op) {
      var state;
      var sectionName;
  
      switch (op.kind) {
        case "update":
          state = applyUpdate(ast, uint8Buffer, [op.oldNode, op.node]);
          sectionName = getSectionForNode(op.node);
          break;
  
        case "delete":
          state = applyDelete(ast, uint8Buffer, op.node);
          sectionName = getSectionForNode(op.node);
          break;
  
        case "add":
          state = applyAdd(ast, uint8Buffer, op.node);
          sectionName = getSectionForNode(op.node);
          break;
  
        default:
          throw new Error("Unknown operation");
      }
      /**
       * Resize section vec size.
       * If the length of the LEB-encoded size changes, this can change
       * the byte length of the section and the offset for nodes in the
       * section. So we do this first before resizing section byte size
       * or shifting following operations' nodes.
       */
  
  
      if (state.deltaElements !== 0 && sectionName !== "start") {
        var oldBufferLength = state.uint8Buffer.length;
        state.uint8Buffer = resizeSectionVecSize(ast, state.uint8Buffer, sectionName, state.deltaElements); // Infer bytes added/removed by comparing buffer lengths
  
        state.deltaBytes += state.uint8Buffer.length - oldBufferLength;
      }
      /**
       * Resize section byte size.
       * If the length of the LEB-encoded size changes, this can change
       * the offset for nodes in the section. So we do this before
       * shifting following operations' nodes.
       */
  
  
      if (state.deltaBytes !== 0 && sectionName !== "start") {
        var _oldBufferLength = state.uint8Buffer.length;
        state.uint8Buffer = resizeSectionByteSize(ast, state.uint8Buffer, sectionName, state.deltaBytes); // Infer bytes added/removed by comparing buffer lengths
  
        state.deltaBytes += state.uint8Buffer.length - _oldBufferLength;
      }
      /**
       * Shift following operation's nodes
       */
  
  
      if (state.deltaBytes !== 0) {
        ops.forEach(function (op) {
          // We don't need to handle add ops, they are positioning independent
          switch (op.kind) {
            case "update":
              shiftLocNodeByDelta(op.oldNode, state.deltaBytes);
              break;
  
            case "delete":
              shiftLocNodeByDelta(op.node, state.deltaBytes);
              break;
          }
        });
      }
  
      uint8Buffer = state.uint8Buffer;
    });
    return uint8Buffer;
  }