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# File 'lib/couch_potato/rspec/matchers/map_reduce_to_matcher.rb', line 27
def matches?(view_spec)
js = <<-JS
(function() {
var sum = function(values) {
return values.reduce(function(memo, value) { return memo + value; });
};
// Equivalents of couchdb built-in reduce functions whose names can be
// given as the reduce function in the view_spec:
var _sum = function(keys, values, rereduce) {
return sum(values);
}
var _count = function(keys, values, rereduce) {
if (rereduce) {
return sum(values);
} else {
return values.length;
}
}
var _stats = function(keys, values, rereduce) {
var result = {sum: 0, count: 0, min: Number.MAX_VALUE, max: Number.MIN_VALUE, sumsqr: 0};
if (rereduce) {
for (var i in values) {
var value = values[i];
result.sum += value.sum;
result.count += value.count;
result.min = Math.min(result.min, value.min);
result.max = Math.max(result.max, value.max);
result.sumsqr += value.sumsqr;
}
} else {
for (var i in values) {
var value = values[i];
result.sum += value;
result.count += 1;
result.min = Math.min(result.min, value);
result.max = Math.max(result.max, value);
result.sumsqr += Math.pow(value, 2);
}
}
return result;
}
var docs = #{@input_ruby.to_json};
var options = #{@options.to_json};
var map = #{view_spec.map_function};
var reduce = #{view_spec.reduce_function};
var lib = #{view_spec.respond_to?(:lib) && view_spec.lib.to_json};
var collate = (function() { var module = {exports: {}}; var exports = module.exports; eval(#{File.read(File.expand_path(File.dirname(__FILE__) + '/../../../../vendor/pouchdb-collate/pouchdb-collate.js')).to_json}); return module.exports.collate;})();
// Map the input docs
var require = function(modulePath) {
var module = {exports: {}};
var exports = module.exports;
var pathArray = modulePath.split("/").slice(2);
var result = lib;
for (var i in pathArray) {
result = result[pathArray[i]];
}
eval(result);
return module.exports;
}
var unfilteredMapResults = [];
var emit = function(key, value) {
unfilteredMapResults.push({key: key, value: value});
};
for (var i in docs) {
map(docs[i]);
}
// Filter results by key/keys/startkey/endkey (if given).
var mapResults = [];
if (options.key) {
for (var r in unfilteredMapResults) {
var result = unfilteredMapResults[r];
if (collate(result.key, options.key) == 0)
mapResults.push(result);
}
}
// couchdb does not support multiple keys for reduce views without group=true
else if (options.keys && options.group) {
for (var r in unfilteredMapResults) {
var result = unfilteredMapResults[r];
for (var k in options.keys) {
var key = options.keys[k];
if (collate(result.key, key) == 0) {
mapResults.push(result);
break;
}
}
}
}
else if (options.startkey || options.endkey) {
for (var r in unfilteredMapResults) {
var result = unfilteredMapResults[r];
if (options.startkey && collate(options.startkey, result.key) > 0)
continue;
if (options.endkey && collate(result.key, options.endkey) > 0)
continue;
mapResults.push(result);
}
}
else {
mapResults = unfilteredMapResults;
}
// Group the map results, honoring the group and group_level options
var grouped = [];
if (options.group || options.group_level) {
var groupLevel = options.group_level;
if (groupLevel == "exact" || options.group == true)
groupLevel = 9999;
for (var mr in mapResults) {
var mapResult = mapResults[mr];
var groupedKey = Array.isArray(mapResult.key) ? mapResult.key.slice(0, groupLevel) : mapResult.key;
var groupFound = false;
for (var g in grouped) {
var group = grouped[g];
if (collate(groupedKey, group.groupedKey) == 0) {
group.keys.push(mapResult.key);
group.values.push(mapResult.value);
groupFound = true;
break;
}
}
if (!groupFound)
grouped.push({keys: [mapResult.key], groupedKey: groupedKey, values: [mapResult.value]});
}
} else {
var group = {keys: null, groupedKey: null, values: []};
for (var mr in mapResults)
group.values.push(mapResults[mr].value);
grouped.push(group);
}
// Reduce the grouped map results
var results = [];
for (var g in grouped) {
var group = grouped[g], reduced = null;
if (group.values.length >= 2) {
// Split the values into two parts, reduce each part, then rereduce those results
var mid = parseInt(group.values.length / 2);
var keys1 = (group.keys || []).slice(0, mid),
values1 = group.values.slice(0, mid);
var reduced1 = reduce(keys1, values1, false);
var keys2 = (group.keys || []).slice(mid, group.values.length),
values2 = group.values.slice(mid, group.values.length);
var reduced2 = reduce(keys2, values2, false);
reduced = reduce(null, [reduced1, reduced2], true);
} else {
// Not enough values to split, so just reduce, and then rereduce the single result
reduced = reduce(group.keys, group.values, false);
reduced = reduce(null, [reduced], true);
}
results.push({key: group.groupedKey, value: reduced});
}
return JSON.stringify(results);
})()
JS
@actual_ruby = JSON.parse(ExecJS.eval(js))
@expected_ruby == @actual_ruby
end
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