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// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
//
// Based on the normalizeFunction which can be
// found here:
//
// https://github.com/dmunch/couch-chakra/blob/master/js/normalizeFunction.js
function rewriteFunInt(fun) {
const hash = new Sha256();
hash.update(fun);
const key = hash.toString();
if (State.cache[key]) {
return State.cache[key];
}
const ast = esprima.parse(fun);
let idx = ast.body.length - 1;
let decl = {};
// Search for the first FunctionDeclaration beginning from the end
do {
decl = ast.body[idx--];
} while (idx >= 0 && decl.type !== "FunctionDeclaration");
idx++;
// If we have a function declaration without an Id, wrap it
// in an ExpressionStatement and change it into
// a FuntionExpression
if (decl.type == "FunctionDeclaration" && decl.id == null) {
decl.type = "FunctionExpression";
ast.body[idx] = {
type: "ExpressionStatement",
expression: decl
};
}
// Generate source from the rewritten AST
const newSource = escodegen.generate(ast);
State.cache[key] = newSource;
return State.cache[key];
}
function rewriteFun(funJSON) {
const fun = JSON.parse(funJSON);
return JSON.stringify(rewriteFunInt(fun));
}
function rewriteFuns(funsJSON) {
let funs = JSON.parse(funsJSON);
const results = Array.from(funs, (fun) => {
return rewriteFunInt(fun);
});
return JSON.stringify(results);
}
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