dyaml/examples/yaml_gen/yaml_gen.d

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///Random YAML generator. Used to generate benchmarking inputs.
import std.algorithm;
import std.conv;
import std.datetime;
import std.math;
import std.random;
import std.stdio;
import std.string;
import dyaml;
Node config;
Node function(bool)[string] generators;
auto typesScalar = ["string", "int", "float", "bool", "timestamp", "binary"];
auto typesScalarKey = ["string", "int", "float", "timestamp"];
auto typesCollection = ["map","omap", "pairs", "seq", "set"];
ulong minNodesDocument;
ulong totalNodes;
static this()
{
generators["string"] = &genString;
generators["int"] = &genInt;
generators["float"] = &genFloat;
generators["bool"] = &genBool;
generators["timestamp"] = &genTimestamp;
generators["binary"] = &genBinary;
generators["map"] = &genMap;
generators["omap"] = &genOmap;
generators["pairs"] = &genPairs;
generators["seq"] = &genSeq;
generators["set"] = &genSet;
}
real randomNormalized(const string distribution = "linear")
{
auto generator = Random(unpredictableSeed());
const r = uniform!"[]"(0.0L, 1.0L, generator);
switch(distribution)
{
case "linear":
return r;
case "quadratic":
return r * r;
case "cubic":
return r * r * r;
default:
writeln("Unknown random distribution: ", distribution,
", falling back to linear");
return randomNormalized("linear");
}
}
long randomLong(const long min, const long max, const string distribution = "linear")
{
return min + cast(long)round((max - min) * randomNormalized(distribution));
}
real randomReal(const real min, const real max, const string distribution = "linear")
{
return min + (max - min) * randomNormalized(distribution);
}
dchar randomChar(const dstring chars)
{
return chars[randomLong(0, chars.length - 1)];
}
string randomType(string[] types)
{
auto probabilities = new uint[types.length];
foreach(index, type; types)
{
probabilities[index] = config[type]["probability"].as!uint;
}
return types[dice(probabilities)];
}
Node genString(bool root = false)
{
auto range = config["string"]["range"];
auto alphabet = config["string"]["alphabet"].as!dstring;
const chars = randomLong(range["min"].as!uint, range["max"].as!uint,
range["dist"].as!string);
dchar[] result = new dchar[chars];
result[0] = randomChar(alphabet);
foreach(i; 1 .. chars)
{
result[i] = randomChar(alphabet);
}
return Node(result.to!string);
}
Node genInt(bool root = false)
{
auto range = config["int"]["range"];
const result = randomLong(range["min"].as!int, range["max"].as!int,
range["dist"].as!string);
return Node(result);
}
Node genFloat(bool root = false)
{
auto range = config["float"]["range"];
const result = randomReal(range["min"].as!real, range["max"].as!real,
range["dist"].as!string);
return Node(result);
}
Node genBool(bool root = false)
{
return Node([true, false][randomLong(0, 1)]);
}
Node genTimestamp(bool root = false)
{
auto range = config["timestamp"]["range"];
auto hnsecs = randomLong(range["min"].as!ulong, range["max"].as!ulong,
range["dist"].as!string);
if(randomNormalized() <= config["timestamp"]["round-chance"].as!real)
{
hnsecs -= hnsecs % 10000000;
}
return Node(SysTime(hnsecs));
}
Node genBinary(bool root = false)
{
auto range = config["binary"]["range"];
const bytes = randomLong(range["min"].as!uint, range["max"].as!uint,
range["dist"].as!string);
ubyte[] result = new ubyte[bytes];
foreach(i; 0 .. bytes)
{
result[i] = cast(ubyte)randomLong(0, 255);
}
return Node(result);
}
Node nodes(const bool root, Node range, const string tag, const bool set = false)
{
auto types = config["collection-keys"].as!bool ? typesCollection : [];
types ~= (set ? typesScalarKey : typesScalar);
Node[] nodes;
if(root)
{
while(!(totalNodes >= minNodesDocument))
{
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nodes.assumeSafeAppend;
nodes ~= generateNode(randomType(types));
}
}
else
{
const elems = randomLong(range["min"].as!uint, range["max"].as!uint,
range["dist"].as!string);
nodes = new Node[elems];
foreach(i; 0 .. elems)
{
nodes[i] = generateNode(randomType(types));
}
}
return Node(nodes, tag);
}
Node genSeq(bool root = false)
{
return nodes(root, config["seq"]["range"], "tag:yaml.org,2002:seq");
}
Node genSet(bool root = false)
{
return nodes(root, config["seq"]["range"], "tag:yaml.org,2002:set", true);
}
Node pairs(bool root, bool complex, Node range, string tag)
{
Node[] keys, values;
if(root)
{
while(!(totalNodes >= minNodesDocument))
{
const key = generateNode(randomType(typesScalarKey ~ (complex ? typesCollection : [])));
// Maps can't contain duplicate keys
if(tag.endsWith("map") && keys.canFind(key)) { continue; }
keys.assumeSafeAppend;
values.assumeSafeAppend;
keys ~= key;
values ~= generateNode(randomType(typesScalar ~ typesCollection));
}
}
else
{
const pairs = randomLong(range["min"].as!uint, range["max"].as!uint,
range["dist"].as!string);
keys = new Node[pairs];
values = new Node[pairs];
outer: foreach(i; 0 .. pairs)
{
auto key = generateNode(randomType(typesScalarKey ~ (complex ? typesCollection : [])));
// Maps can't contain duplicate keys
while(tag.endsWith("map") && keys[0 .. i].canFind(key))
{
key = generateNode(randomType(typesScalarKey ~ (complex ? typesCollection : [])));
}
keys[i] = key;
values[i] = generateNode(randomType(typesScalar ~ typesCollection));
}
}
return Node(keys, values, tag);
}
Node genMap(bool root = false)
{
Node range = config["map"]["range"];
const complex = config["complex-keys"].as!bool;
return pairs(root, complex, range, "tag:yaml.org,2002:map");
}
Node genOmap(bool root = false)
{
Node range = config["omap"]["range"];
const complex = config["complex-keys"].as!bool;
return pairs(root, complex, range, "tag:yaml.org,2002:omap");
}
Node genPairs(bool root = false)
{
Node range = config["pairs"]["range"];
const complex = config["complex-keys"].as!bool;
return pairs(root, complex, range, "tag:yaml.org,2002:pairs");
}
Node generateNode(const string type, bool root = false)
{
++totalNodes;
return generators[type](root);
}
Node[] generate(const string configFileName)
{
config = Loader.fromFile(configFileName).load();
minNodesDocument = config["min-nodes-per-document"].as!long;
Node[] result;
foreach(i; 0 .. config["documents"].as!uint)
{
result ~= generateNode(config["root-type"].as!string, true);
totalNodes = 0;
}
return result;
}
void main(string[] args)
{
//Help message.
if(args.length == 1)
{
writeln("Usage: yaml_gen FILE [CONFIG_FILE]\n");
writeln("Generates a random YAML file and writes it to FILE.");
writeln("If provided, CONFIG_FILE overrides the default config file.");
return;
}
string configFile = args.length >= 3 ? args[2] : "config.yaml";
try
{
//Generate and dump the nodes.
Node[] generated = generate(configFile);
auto dumper = dumper();
auto encoding = config["encoding"];
dumper.indent = config["indent"].as!uint;
dumper.textWidth = config["text-width"].as!uint;
switch(encoding.as!string)
{
case "utf-16": dumper.dump!wchar(File(args[1], "w").lockingTextWriter, generated); break;
case "utf-32": dumper.dump!dchar(File(args[1], "w").lockingTextWriter, generated); break;
default: dumper.dump!char(File(args[1], "w").lockingTextWriter, generated); break;
}
}
catch(YAMLException e)
{
writeln("ERROR: ", e.msg);
}
}