Replace no-op style filter expressions #62
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zmiao
reviewed
Jul 26, 2024
test/styleToFilter.test.js
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| [ | ||
| "case", | ||
| [">=", ["distance-from-center"], 1], | ||
| true, | ||
| [">=", ["pitch"], 45] | ||
| ], |
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If we change the expression a little to be:
[
"case",
[">=", ["distance-from-center"], 1],
false,
[">=", ["pitch"], 45]
],
The case expression will return false, excluding the feature. Therefore, we probably need to aggressively set the entire case expression to ['literal', true].
zmiao
reviewed
Jul 29, 2024
lib/styleToFilters.js
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| @@ -33,15 +33,15 @@ function styleToFilters(style) { | |||
| if (styleMin < layers[layerName].minzoom) layers[layerName].minzoom = styleMin; | |||
| if (styleMax > layers[layerName].maxzoom) layers[layerName].maxzoom = styleMax; | |||
| // Modify filter | |||
| if (layers[layerName].filters === true || !style.layers[i].filter) { | |||
| if (layers[layerName].filters === true || !style.layers[i].filter || isNoOpFilter(style.layers[i].filter)) { | |||
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this would be too aggressive, so for such case:
"filter": [
"all",
[
"case",
["<=", ["pitch"], 45],
true,
["<=", ["distance-from-center"], 1]
],
["match", ["get", "type"], ["Toll booth"], true, false]
],
we would want to replace it with:
"filter": [
"all",
[
"literal",
true
],
["match", ["get", "type"], ["Toll booth"], true, false]
],
instead of just ['literal', true]
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This PR adds a "pre-filter" that removes no-op style filter expressions as
['pitch'],['distance-from-center']by replacing them with an expression that always evaluates to true.