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Remove declarations in an order-preserving way

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This commit is contained in:
Robin Voetter
2020-06-15 13:50:07 +02:00
parent 101654900d
commit baa1a68b53
1 changed files with 12 additions and 12 deletions
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24
generator/generator.zig
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@@ -132,22 +132,22 @@ const DeclarationResolver = struct {
} }
} }
// Swap-remove all declarations that are not required. // Remove all declarations that are not required.
// Some declarations may exist in `self.declarations` that do not exit in // Some declarations may exist in `self.declarations` that do not exit in
// `self.registry.decls`, these are mostly macros and other stuff not parsed. // `self.registry.decls`, these are mostly macros and other stuff not pa
var i: usize = 0; var read_index: usize = 0;
var count = self.registry.decls.len; var write_index: usize = 0;
while (i < count) { while (read_index < self.registry.decls.len) {
const decl = self.registry.decls[i]; const decl = self.registry.decls[read_index];
if (self.declarations.contains(decl.name)) { if (self.declarations.contains(decl.name)) {
i += 1; self.registry.decls[write_index] = decl;
} else { write_index += 1;
count -= 1;
self.registry.decls[i] = self.registry.decls[count];
} }
read_index += 1;
} }
self.registry.decls = self.reg_arena.shrink(self.registry.decls, count); self.registry.decls = self.reg_arena.shrink(self.registry.decls, write_index);
} }
}; };