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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.
var cmd;
var map_funs = []; // The map functions to compute against documents
var map_results = [];
try {
var sandbox = evalcx('');
sandbox.map = function(key, value) {
map_results.push([key, value]);
}
} catch (e) {
// fallback for older versions of spidermonkey that don't have evalcx
var sandbox = null;
map = function(key, value) {
map_results.push([key, value]);
}
}
// Commands are in the form of json arrays:
// ["commandname",..optional args...]\n
//
// Responses are json values followed by a new line ("\n")
while (cmd = eval(readline())) {
switch (cmd[0]) {
case "reset":
// clear the map_functions and run gc
map_funs = [];
gc();
print("true"); // indicates success
break;
case "add_fun":
// The second arg is a string that will compile to a function.
// and then we add it to map_functions array
try {
var functionObject = sandbox ? evalcx(cmd[1], sandbox) : eval(cmd[1]);
} catch (err) {
print(toJSON({error: {id: "map_compilation_error",
reason: err.toString() + " (" + toJSON(cmd[1]) + ")"}}));
break;
}
if (typeof(functionObject) == "function") {
map_funs.push(functionObject);
print("true");
} else {
print(toJSON({error: "map_compilation_error",
reason: "expression does not eval to a function. (" + cmd[1] + ")"}));
}
break;
case "map_doc":
// The second arg is a document. We compute all the map functions against
// it.
//
// Each function can output multiple keys value, pairs for each document
//
// Example output of map_doc after three functions set by add_fun cmds:
// [
// [["Key","Value"]], <- fun 1 returned 1 key value
// [], <- fun 2 returned 0 key values
// [["Key1","Value1"],["Key2","Value2"]] <- fun 3 returned 2 key values
// ]
//
var doc = cmd[1];
seal(doc); // seal to prevent map functions from changing doc
var buf = [];
for (var i = 0; i < map_funs.length; i++) {
map_results = [];
try {
map_funs[i](doc);
buf.push(map_results.filter(function(pair) {
return pair[0] !== undefined && pair[1] !== undefined;
}));
} catch (err) {
if (err == "fatal_error") {
// Only if it's a "fatal_error" do we exit. What's a fatal error?
// That's for the query to decide.
//
// This will make it possible for queries to completely error out,
// by catching their own local exception and rethrowing a
// fatal_error. But by default if they don't do error handling we
// just eat the exception and carry on.
print(toJSON({error: "map_runtime_error",
reason: "function raised fatal exception"}));
quit();
}
print(toJSON({log: "function raised exception (" + err + ")"}));
buf.push([]);
}
}
print(toJSON(buf));
break;
default:
print(toJSON({error: "query_server_error",
reason: "unknown command '" + cmd[0] + "'"}));
quit();
}
}
function toJSON(val) {
if (typeof(val) == "undefined") {
throw new TypeError("Cannot encode undefined value as JSON");
}
var subs = {'\b': '\\b', '\t': '\\t', '\n': '\\n', '\f': '\\f',
'\r': '\\r', '"' : '\\"', '\\': '\\\\'};
if (typeof(val) == "xml") { // E4X support
val = val.toXMLString();
}
return {
"Array": function(v) {
var buf = [];
for (var i = 0; i < v.length; i++) {
buf.push(toJSON(v[i]));
}
return "[" + buf.join(",") + "]";
},
"Boolean": function(v) {
return v.toString();
},
"Date": function(v) {
var f = function(n) { return n < 10 ? '0' + n : n }
return '"' + v.getUTCFullYear() + '-' +
f(v.getUTCMonth() + 1) + '-' +
f(v.getUTCDate()) + 'T' +
f(v.getUTCHours()) + ':' +
f(v.getUTCMinutes()) + ':' +
f(v.getUTCSeconds()) + 'Z"';
},
"Number": function(v) {
return isFinite(v) ? v.toString() : "null";
},
"Object": function(v) {
if (v === null) return "null";
var buf = [];
for (var k in v) {
if (!v.hasOwnProperty(k) || typeof(k) !== "string" || v[k] === undefined) {
continue;
}
buf.push(toJSON(k, val) + ": " + toJSON(v[k]));
}
return "{" + buf.join(",") + "}";
},
"String": function(v) {
if (/["\\\x00-\x1f]/.test(v)) {
v = v.replace(/([\x00-\x1f\\"])/g, function(a, b) {
var c = subs[b];
if (c) return c;
c = b.charCodeAt();
return '\\u00' + Math.floor(c / 16).toString(16) + (c % 16).toString(16);
});
}
return '"' + v + '"';
}
}[val != null ? val.constructor.name : "Object"](val);
}
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