243 lines
8.7 KiB
D
243 lines
8.7 KiB
D
module fahrplanparser;
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import std.algorithm : map;
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import std.array : empty, front;
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import std.conv : to;
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import std.datetime : dur, TimeOfDay, DateTimeException;
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import std.string : format;
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import kxml.xml : readDocument, XmlNode;
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import substitution;
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private:
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enum departureNodeName = "dp";
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enum timeNodeName = "t";
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enum realTimeNodeName = "rt";
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enum departuresXPath = "/efa/dps/" ~ departureNodeName;
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template timeXPath(string _timeNodeName = timeNodeName)
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{
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enum timeXPath = "/st/" ~ _timeNodeName;
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}
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enum useRealTimeXPath = "/realtime";
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enum lineXPath = "/m/nu";
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enum directionXPath = "/m/des";
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public:
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/***********************************
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* Parses the departure monitor data and returns it as an associative array.
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* data is expected to contain valid XML as returned by queries sent to http://mobile.defas-fgi.de/beg/.
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*/
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auto parsedFahrplan(in string data)
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{
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// dfmt off
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return data.readDocument
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.parseXPath(departuresXPath)
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.map!(dp => ["departure" : "%02s:%02s".format(dp.departureTime.hour, dp.departureTime.minute),
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"delay" : dp.delay.total!"minutes".to!string,
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"line": dp.parseXPath(lineXPath).front.getCData,
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"direction": dp.parseXPath(directionXPath).front.getCData.substitute]);
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// dfmt on
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}
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///
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@system unittest
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{
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import std.array : array;
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auto xml = "";
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assert(xml.parsedFahrplan.array == []);
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xml = "<efa><dps></dps></efa>";
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assert(xml.parsedFahrplan.array == []);
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xml = "<efa><dps><dp><realtime>1</realtime><st><t>1224</t><rt>1242</rt></st><m><nu>6</nu><des>Wernerwerkstraße</des></m></dp></dps></efa>";
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assert(xml.parsedFahrplan.array == [["direction" : "Wernerwerkstraße",
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"line" : "6", "departure" : "12:24", "delay" : "18"]]);
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xml = "<efa><dps><dp><realtime>0</realtime><st><t>1224</t></st><m><nu>6</nu><des>Wernerwerkstraße</des></m></dp></dps></efa>";
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assert(xml.parsedFahrplan.array == [["direction" : "Wernerwerkstraße",
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"line" : "6", "departure" : "12:24", "delay" : "0"]]);
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xml = "<efa><dps><dp><realtime>0</realtime><st><t>1224</t></st><m><nu>6</nu><des>Wernerwerkstraße</des></m></dp><dp><realtime>1</realtime><st><t>1353</t><rt>1356</rt></st><m><nu>11</nu><des>Burgweinting</des></m></dp></dps></efa>";
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assert(xml.parsedFahrplan.array == [["direction" : "Wernerwerkstraße", "line" : "6",
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"departure" : "12:24", "delay" : "0"], ["direction" : "Burgweinting",
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"line" : "11", "departure" : "13:53", "delay" : "3"]]);
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}
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private:
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class UnexpectedValueException(T) : Exception
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{
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this(T t, string node) @safe pure
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{
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super(`Unexpected value "%s" for node "%s"`.format(t, node));
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}
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}
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class CouldNotFindeNodeException : Exception
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{
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this(string node) @safe pure
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{
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super(`Could not find node "%s"`.format(node));
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}
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}
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auto departureTime(string _timeNodeName = timeNodeName)(XmlNode dp)
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in
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{
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assert(dp.getName == departureNodeName);
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}
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body
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{
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auto timeNodes = dp.parseXPath(timeXPath!_timeNodeName);
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if (timeNodes.empty)
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throw new CouldNotFindeNodeException(_timeNodeName);
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return TimeOfDay.fromISOString(timeNodes.front.getCData ~ "00");
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}
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@system unittest
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{
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import std.exception : assertThrown;
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auto xml = "<dp><st><t>0000</t></st></dp>".readDocument.parseXPath("/dp").front;
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assert(xml.departureTime == TimeOfDay(0, 0));
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xml = "<dp><st><t>0013</t></st></dp>".readDocument.parseXPath("/dp").front;
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assert(xml.departureTime == TimeOfDay(0, 13));
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xml = "<dp><st><t>1100</t></st></dp>".readDocument.parseXPath("/dp").front;
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assert(xml.departureTime == TimeOfDay(11, 00));
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xml = "<dp><st><t>1242</t></st></dp>".readDocument.parseXPath("/dp").front;
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assert(xml.departureTime == TimeOfDay(12, 42));
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xml = "<dp><st><t>2359</t></st></dp>".readDocument.parseXPath("/dp").front;
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assert(xml.departureTime == TimeOfDay(23, 59));
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assertThrown!DateTimeException("<dp><st><t>2400</t></st></dp>".readDocument.parseXPath("/dp")
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.front.departureTime);
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assertThrown!DateTimeException("<dp><st><t>0061</t></st></dp>".readDocument.parseXPath("/dp")
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.front.departureTime);
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assertThrown!DateTimeException("<dp><st><t>2567</t></st></dp>".readDocument.parseXPath("/dp")
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.front.departureTime);
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assertThrown!DateTimeException("<dp><st><t></t></st></dp>".readDocument.parseXPath("/dp")
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.front.departureTime);
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assertThrown!DateTimeException("<dp><st><t>0</t></st></dp>".readDocument.parseXPath("/dp")
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.front.departureTime);
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assertThrown!DateTimeException("<dp><st><t>00</t></st></dp>".readDocument.parseXPath("/dp")
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.front.departureTime);
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assertThrown!DateTimeException("<dp><st><t>000000</t></st></dp>".readDocument.parseXPath("/dp")
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.front.departureTime);
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assertThrown!DateTimeException("<dp><st><t>00:00</t></st></dp>".readDocument.parseXPath("/dp")
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.front.departureTime);
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assertThrown!DateTimeException("<dp><st><t>abcd</t></st></dp>".readDocument.parseXPath("/dp")
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.front.departureTime);
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}
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auto delay(XmlNode dp)
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in
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{
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assert(dp.getName == departureNodeName);
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}
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body
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{
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immutable useRealtimeString = dp.parseXPath(useRealTimeXPath).front.getCData;
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if (useRealtimeString == "0")
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return dur!"minutes"(0);
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else if (useRealtimeString == "1")
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{
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try
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{
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immutable expectedTime = dp.departureTime;
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immutable realTime = dp.departureTime!realTimeNodeName;
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auto timeDiff = realTime - expectedTime;
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if (timeDiff < dur!"minutes"(0))
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timeDiff = dur!"hours"(24) + timeDiff;
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return timeDiff;
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}
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catch (CouldNotFindeNodeException e)
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{
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return dur!"minutes"(0);
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}
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}
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else
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throw new UnexpectedValueException!string(useRealtimeString, "realtime");
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}
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@system unittest
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{
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import std.exception : assertThrown;
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import core.exception : AssertError;
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auto xml = "<dp><realtime>0</realtime></dp>".readDocument.parseXPath("/dp").front;
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assert(xml.delay == dur!"minutes"(0));
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xml = "<dp><realtime></realtime></dp>".readDocument.parseXPath("/dp").front;
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assertThrown!(UnexpectedValueException!string)(xml.delay);
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xml = "<dp><realtime>2</realtime></dp>".readDocument.parseXPath("/dp").front;
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assertThrown!(UnexpectedValueException!string)(xml.delay);
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xml = "<dp><realtime>a</realtime></dp>".readDocument.parseXPath("/dp").front;
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assertThrown!(UnexpectedValueException!string)(xml.delay);
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xml = "<dp><realtime>1</realtime></dp>".readDocument.parseXPath("/dp").front;
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assert(xml.delay == dur!"seconds"(0));
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xml = "<dp><realtime>1</realtime><st><t></t></st></dp>".readDocument.parseXPath("/dp").front;
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assertThrown!DateTimeException(xml.delay);
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xml = "<dp><realtime>1</realtime><st><rt></rt></st></dp>".readDocument.parseXPath("/dp").front;
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assert(xml.delay == dur!"seconds"(0));
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xml = "<dp><st><rt></rt><t></t></st></dp>".readDocument.parseXPath("/dp").front;
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assertThrown!AssertError(xml.delay);
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xml = "<dp><realtime>1</realtime><st><rt></rt><t></t></st></dp>".readDocument.parseXPath("/dp")
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.front;
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assertThrown!DateTimeException(xml.delay);
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xml = "<dp><realtime>1</realtime><st><rt>0000</rt><t></t></st></dp>".readDocument.parseXPath("/dp")
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.front;
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assertThrown!DateTimeException(xml.delay);
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xml = "<dp><realtime>1</realtime><st><rt></rt><t>0000</t></st></dp>".readDocument.parseXPath("/dp")
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.front;
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assertThrown!DateTimeException(xml.delay);
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xml = "<dp><realtime>1</realtime><st><rt>0000</rt><t>0000</t></st></dp>"
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.readDocument.parseXPath("/dp").front;
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assert(xml.delay == dur!"minutes"(0));
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xml = "<dp><realtime>1</realtime><st><rt>0001</rt><t>0000</t></st></dp>"
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.readDocument.parseXPath("/dp").front;
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assert(xml.delay == dur!"minutes"(1));
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xml = "<dp><realtime>1</realtime><st><rt>1753</rt><t>1751</t></st></dp>"
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.readDocument.parseXPath("/dp").front;
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assert(xml.delay == dur!"minutes"(2));
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xml = "<dp><realtime>1</realtime><st><rt>1010</rt><t>1000</t></st></dp>"
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.readDocument.parseXPath("/dp").front;
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assert(xml.delay == dur!"minutes"(10));
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xml = "<dp><realtime>1</realtime><st><rt>1301</rt><t>1242</t></st></dp>"
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.readDocument.parseXPath("/dp").front;
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assert(xml.delay == dur!"minutes"(19));
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xml = "<dp><realtime>1</realtime><st><rt>0000</rt><t>1242</t></st></dp>"
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.readDocument.parseXPath("/dp").front;
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assert(xml.delay == dur!"minutes"(678));
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xml = "<dp><realtime>1</realtime><st><rt>0000</rt><t>2359</t></st></dp>"
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.readDocument.parseXPath("/dp").front;
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assert(xml.delay == dur!"minutes"(1));
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}
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