106 lines
2.7 KiB
D
106 lines
2.7 KiB
D
module substitution;
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import std.file : slurp;
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import std.meta : AliasSeq;
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import std.traits : Parameters;
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public:
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/***********************************
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* Loads a substitution dictonary from a file.
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*/
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void loadSubstitutionFile(alias slurpFun = slurp)(string fileName)
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if (is(Parameters!(slurpFun!(string, string)) == AliasSeq!(string, const char[])))
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{
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import std.algorithm.iteration : each;
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map = (string[string]).init;
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slurpFun!(string, string)(fileName, `"%s" = "%s"`).each!(pair => map[pair[0]] = pair[1]);
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}
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///
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@safe unittest
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{
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import std.typecons : Tuple, tuple;
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static Tuple!(string, string)[] mockSlurpEmpty(Type1, Type2)(string filename, in char[] format)
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{
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return [];
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}
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loadSubstitutionFile!mockSlurpEmpty("");
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assert(map.length == 0);
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static Tuple!(string, string)[] mockSlurpEmptyEntry(Type1, Type2)(string filename,
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in char[] format)
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{
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return [tuple("", "")];
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}
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loadSubstitutionFile!mockSlurpEmptyEntry("");
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assert("" in map);
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assert(map.length == 1);
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assert(map[""] == "");
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static Tuple!(string, string)[] mockSlurpSingleEntry(Type1, Type2)(string filename,
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in char[] format)
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{
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return [tuple("foo", "bar")];
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}
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loadSubstitutionFile!mockSlurpSingleEntry("");
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assert("foo" in map);
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assert(map.length == 1);
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assert(map["foo"] == "bar");
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static Tuple!(string, string)[] mockSlurpMultipleEntries(Type1, Type2)(
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string filename, in char[] format)
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{
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return [tuple("", ""), tuple("0", "1"), tuple("Text in", "wird durch diesen ersetzt")];
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}
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loadSubstitutionFile!mockSlurpMultipleEntries("");
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assert("" in map);
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assert("0" in map);
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assert("Text in" in map);
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assert(map.length == 3);
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assert(map[""] == "");
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assert(map["0"] == "1");
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assert(map["Text in"] == "wird durch diesen ersetzt");
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}
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/***********************************
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* Substitutes a string with its corresponding replacement, if one is available.
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* Otherwise just returns the original string.
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*/
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auto substitute(string s) @safe nothrow
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{
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return s in map ? map[s] : s;
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}
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///
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@safe unittest
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{
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map[""] = "";
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assert(substitute("") == "");
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map["a"] = "b";
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assert(substitute("a") == "b");
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map["Regensburg Danziger Freiheit"] = "Danziger Freiheit";
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assert(substitute("Regensburg Danziger Freiheit") == "Danziger Freiheit");
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map["Regensburg Danziger Freiheit"] = "Anderer Test";
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assert(substitute("Regensburg Danziger Freiheit") == "Anderer Test");
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assert(substitute("z") == "z");
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assert(substitute("Regensburg Hauptbahnhof") == "Regensburg Hauptbahnhof");
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}
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private:
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string[string] map;
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