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opIndex, opDollar and opSlice override on ParseTree #275

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Mar 24, 2020
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opIndex, opDollar and opSlice override on ParseTree #275

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23 changes: 23 additions & 0 deletions pegged/peg.d
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Original file line number Diff line number Diff line change
Expand Up @@ -351,6 +351,24 @@ struct ParseTree
{
return cast(immutable)dup();
}

// Override opIndex operators
ref ParseTree opIndex(size_t index) {
return children[index];
}

ref ParseTree[] opIndex() {
return children;
}

size_t opDollar(size_t pos)()
{
return children.length;
}

ParseTree[] opSlice(size_t i, size_t j) {
return children[i..j];
}
}


Expand All @@ -365,6 +383,11 @@ unittest // ParseTree testing
ParseTree child = ParseTree("Child", true, ["abc", "", "def"], "input", 0, 1, null);
p.children = [child, child];

assert(p.children[0] == p[0], "override opIndex allows to write less verbose code to navigate the tree");
assert(p.children == p[] );
assert(p.children[0..1] == p[0..1] );
assert(p.children[0..$] == p[0..$] );

ParseTree q = p;
assert(p == q, "Copying creates equal trees.");

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