Merge pull request #38 from mholthausen/extract-nested-expressions

Fixes extraction of nested expressions with more than two filter

data/mapfiles/line_set_of_expressions.map

@@ -0,0 +1,14 @@
+IMAGECOLOR "#f3f3e9"
+LAYER
+    NAME roads_inline
+    TYPE LINE
+    EXTENT -20026376.39 -20048966.10 20026376.39 20048966.10
+    PROJECTION
+      "init=epsg:3857"
+    END
+    CLASS
+      MAXSCALEDENOM 500000
+      MINSCALEDENOM 25000
+      EXPRESSION (('[class]' = 'railways') AND ('[service]' != 'spur') AND ('[type]' = 'rail'))
+    END
+END

data/styles/line_set_of_expressions.ts

@@ -0,0 +1,20 @@
+import { Style } from 'geostyler-style';
+
+const lineExpressionStyle: Style = [{
+  name: 'roads_inline',
+  rules: [
+    {
+      name: '',
+      filter: [
+        '&&',
+        ['==', 'class', 'railways'],
+        ['!=', 'service', 'spur'],
+        ['==', 'type', 'rail']
+      ],
+      scaleDenominator: { max: 500000, min: 25000 },
+      symbolizers: []
+    }
+  ]
+}];
+
+export default lineExpressionStyle;