Last active
October 15, 2017 00:05
-
-
Save unleashy/c40e9e6503c473d8c3fd07dd990b7e7f to your computer and use it in GitHub Desktop.
generate is-spec
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| import std.string, std.algorithm, std.range.primitives; | |
| // a | void a() | |
| // a :: b, c, ... | void a(b, c, ...) | |
| // a :: b, c, ... -> r | r a(b, c, ...) | |
| // a -> r | r a() | |
| string generateIsSpec(string typename, string spec) | |
| { | |
| auto buf = "{\nimport std.traits : lvalueOf;\n" ~ | |
| "return is(typeof(" ~ typename ~ ".init) == " ~ typename ~ ") &&\n"; | |
| auto specSplitted = spec.lineSplitter; | |
| size_t i = 0; | |
| foreach (const l; specSplitted) { | |
| if (l.strip.empty) { | |
| continue; | |
| } | |
| if (i != 0 && !specSplitted.empty) { | |
| buf ~= " &&\n"; | |
| } | |
| buf ~= "is(typeof(lvalueOf!(" ~ typename ~ ")."; | |
| if (auto parts = l.findSplit("::")) { | |
| auto fname = parts[0].strip; | |
| buf ~= fname ~ "("; | |
| auto fspec = parts[2].findSplit("->"); | |
| auto fparams = (fspec ? fspec[0] : parts[2]).splitter(','); | |
| if (!fparams.empty) { | |
| auto j = 0; | |
| foreach (const param; fparams) { | |
| if (j != 0 && !fparams.empty) { | |
| buf ~= ", "; | |
| } | |
| buf ~= "lvalueOf!(" ~ param.strip ~ ")"; | |
| ++j; | |
| } | |
| buf ~= ")"; | |
| } | |
| buf ~= ")"; | |
| auto fretType = fspec[2].strip; | |
| if (!fretType.empty && fretType != "void") { | |
| buf ~= " == " ~ fretType; | |
| } | |
| } else if (auto parts = l.findSplit("->")) { | |
| auto fname = parts[0].strip; | |
| buf ~= fname ~ "())"; | |
| auto fretType = parts[2].strip; | |
| if (!fretType.empty && fretType != "void") { | |
| buf ~= " == " ~ fretType; | |
| } | |
| } else { | |
| buf ~= l.strip ~ "())"; | |
| } | |
| buf ~= ")"; | |
| ++i; | |
| } | |
| return buf ~ ";\n}()"; | |
| } | |
| enum isThing(T) = mixin(generateIsSpec( | |
| "T", | |
| " | |
| hello :: int, string -> Asd | |
| ayy :: real | |
| wellShit -> string | |
| doit | |
| " | |
| )); | |
| struct Asd | |
| { | |
| int a; | |
| string b; | |
| } | |
| struct Thing | |
| { | |
| static assert(isThing!Thing); | |
| Asd hello(int a, string b) | |
| { | |
| return Asd(a, b); | |
| } | |
| void ayy(real hurr) | |
| { | |
| } | |
| string wellShit() | |
| { | |
| return "ohoho"; | |
| } | |
| void doit() {} | |
| } | |
| struct Foo(Thingo) if (isThing!Thingo) | |
| { | |
| Thingo t; | |
| } | |
| void main(string[] args) | |
| { | |
| auto foo = Foo!Thing(); | |
| } |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment