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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
// This file has JavaScript functions that should be attached to the MongoHelpers object
// The contents of exportToMongoHelpers will be copied into the MongoHelpers object and
// this dictionary will be removed from the global scope.
exportToMongoHelpers = {
// This function accepts an expression or function body and returns a function definition
'functionExpressionParser': function functionExpressionParser(fnSrc) {
// Ensure that a provided expression or function body is not terminated with a ';'.
// This ensures we interpret the input as a single expression, rather than a sequence
// of expressions, and can wrap it in parentheses.
while (fnSrc.endsWith(";") || fnSrc != fnSrc.trimRight()) {
fnSrc = fnSrc.slice(0, -1).trimRight();
}
var parseTree;
try {
parseTree = this.Reflect.parse(fnSrc);
} catch (e) {
if (e == 'SyntaxError: function statement requires a name') {
return fnSrc;
} else if (e == 'SyntaxError: return not in function') {
return 'function() { ' + fnSrc + ' }';
} else {
throw (e);
}
}
// Input source is a series of expressions. we should prepend the last one with return
var lastStatement = parseTree.body.length - 1;
var lastStatementType = parseTree.body[lastStatement].type;
if (lastStatementType == 'ExpressionStatement') {
var prevExprEnd = 0;
var loc = parseTree.body[lastStatement].loc.start;
// When we're actually doing the pre-pending of return later on we need to know
// whether we've reached the beginning of the line, or the end of the 2nd-to-last
// expression.
if (lastStatement > 0) {
prevExprEnd = parseTree.body[lastStatement - 1].loc.end;
if (prevExprEnd.line != loc.line) {
prevExprEnd = 0;
} else {
prevExprEnd = prevExprEnd.column;
}
}
var lines = fnSrc.split('\n');
var col = loc.column;
var fnSrc;
var origLine = lines[loc.line - 1];
// The parser has a weird behavior where sometimes if you have an expression like
// ((x == 5)), it says that the expression string is "x == 5))", so we may need to
// adjust where we prepend "return".
while (col >= prevExprEnd) {
var modLine = origLine.substr(0, col) + "return " + origLine.substr(col);
lines[loc.line - 1] = modLine;
fnSrc = '{ ' + lines.join('\n') + ' }';
try {
tmpTree = this.Reflect.parse("function x() " + fnSrc);
} catch (e) {
col -= 1;
continue;
}
break;
}
return "function() " + fnSrc;
} else if (lastStatementType == 'FunctionDeclaration') {
return fnSrc;
} else {
return 'function() { ' + fnSrc + ' }';
}
}
};
// WARNING: Anything outside the exportToMongoHelpers dictionary will be available in the
// global scope and visible to users!
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