[core] Rework spec function/expression taxonomy

Ports https://github.com/mapbox/mapbox-gl-js/pull/6521, updating codegen scripts to parse new expression taxonomy.

1 files changed, 8 insertions, 3 deletions

diff --git a/platform/darwin/scripts/generate-style-code.js b/platform/darwin/scripts/generate-style-code.js
index c7b54b326a..47106eeac4 100755
--- a/platform/darwin/scripts/generate-style-code.js
+++ b/platform/darwin/scripts/generate-style-code.js
@@ -318,10 +318,11 @@ global.propertyDoc = function (propertyName, property, layerType, kind) {
         doc += '* Predefined functions, including mathematical and string operators\n' +
             '* Conditional expressions\n' +
             '* Variable assignments and references to assigned variables\n';
-        const inputVariable = property.name === 'heatmap-color' ? '$heatmapDensity' : '$zoomLevel';
-        if (property["property-function"]) {
+        const inputVariable = property.expression && property['property-type'] === 'color-ramp' ?
+            '$' + camelizeWithLeadingLowercase(property.expression.parameters[0]) : '$zoomLevel';
+        if (isDataDriven(property)) {
             doc += `* Interpolation and step functions applied to the \`${inputVariable}\` variable and/or feature attributes\n`;
-        } else if (property.function === "interpolated") {
+        } else if (property.expression && property.expression.interpolated) {
             doc += `* Interpolation and step functions applied to the \`${inputVariable}\` variable\n\n` +
                 'This property does not support applying interpolation or step functions to feature attributes.';
         } else {
@@ -332,6 +333,10 @@ global.propertyDoc = function (propertyName, property, layerType, kind) {
     return doc;
 };
 
+global.isDataDriven = function (property) {
+  return property['property-type'] === 'data-driven' || property['property-type'] === 'cross-faded-data-driven';
+};
+
 global.propertyReqs = function (property, propertiesByName, type) {
     return 'This property is only applied to the style if ' + property.requires.map(function (req) {
         if (typeof req === 'string') {