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kql: only allow top() at start of selector #388

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merged 3 commits into from
Apr 17, 2024
Merged

kql: only allow top() at start of selector #388

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b08fc43
kql: only allow top() at start of selector
alightgoesout Apr 14, 2024
6c4c27e
kql: add some explanation for top() matcher
alightgoesout Apr 16, 2024
b6a4627
kql: rename selector rules in grammar
alightgoesout Apr 17, 2024
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10 changes: 8 additions & 2 deletions QUERY-SPEC.md
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Original file line number Diff line number Diff line change
Expand Up @@ -30,6 +30,11 @@ properties, node names, etc). With the exception of `top()` and `()`, they are a
used inside a `[]` selector. Some matchers are unary, but most of them involve
binary operators.

The `top()` matcher can only be used as the first matcher of a selector. This means
that it cannot be the right operand of the `>`, `>>`, `+`, or `++` operators. As `||`
combines selectors, the `top()` can appear just after it. For instance,
`a > b || top() > b` is valid, but `a > top()` is not.

* `top()`: Returns all toplevel children of the current document.
* `top() > []`: Equivalent to `top()` on its own.
* `(foo)`: Selects any element whose type annotation is `foo`.
Expand Down Expand Up @@ -110,8 +115,9 @@ what they expand to.

```
query-str := $bom? query
query := selector q-ws* "||" q-ws* query | selector
selector := filter q-ws* selector-operator q-ws* selector | filter
query := selector-start q-ws* "||" q-ws* query | selector-start
selector-start := filter q-ws* selector-operator q-ws* selector | filter
selector := matchers q-ws* selector-operator q-ws* selector | matchers
selector-operator := ">>" | ">" | "++" | "+"
filter := "top(" q-ws* ")" | matchers
matchers := type-matcher $string? accessor-matcher* | $string accessor-matcher* | accessor-matcher+
Expand Down