planning

node_modules/@mapbox/mapbox-gl-style-spec/expression/values.js

@@ -0,0 +1,123 @@
+// @flow
+
+import assert from 'assert';
+
+import Color from '../util/color.js';
+import Collator from './types/collator.js';
+import Formatted from './types/formatted.js';
+import ResolvedImage from './types/resolved_image.js';
+import {NullType, NumberType, StringType, BooleanType, ColorType, ObjectType, ValueType, CollatorType, FormattedType, ResolvedImageType, array} from './types.js';
+
+import type {Type} from './types.js';
+
+export function validateRGBA(r: mixed, g: mixed, b: mixed, a?: mixed): string | null {
+    if (!(
+        typeof r === 'number' && r >= 0 && r <= 255 &&
+        typeof g === 'number' && g >= 0 && g <= 255 &&
+        typeof b === 'number' && b >= 0 && b <= 255
+    )) {
+        const value = typeof a === 'number' ? [r, g, b, a] : [r, g, b];
+        return `Invalid rgba value [${value.join(', ')}]: 'r', 'g', and 'b' must be between 0 and 255.`;
+    }
+
+    if (!(
+        typeof a === 'undefined' || (typeof a === 'number' && a >= 0 && a <= 1)
+    )) {
+        return `Invalid rgba value [${[r, g, b, a].join(', ')}]: 'a' must be between 0 and 1.`;
+    }
+
+    return null;
+}
+
+export type Value = null | string | boolean | number | Color | Collator | Formatted | ResolvedImage | $ReadOnlyArray<Value> | { +[string]: Value }
+
+export function isValue(mixed: mixed): boolean {
+    if (mixed === null) {
+        return true;
+    } else if (typeof mixed === 'string') {
+        return true;
+    } else if (typeof mixed === 'boolean') {
+        return true;
+    } else if (typeof mixed === 'number') {
+        return true;
+    } else if (mixed instanceof Color) {
+        return true;
+    } else if (mixed instanceof Collator) {
+        return true;
+    } else if (mixed instanceof Formatted) {
+        return true;
+    } else if (mixed instanceof ResolvedImage) {
+        return true;
+    } else if (Array.isArray(mixed)) {
+        for (const item of mixed) {
+            if (!isValue(item)) {
+                return false;
+            }
+        }
+        return true;
+    } else if (typeof mixed === 'object') {
+        for (const key in mixed) {
+            if (!isValue(mixed[key])) {
+                return false;
+            }
+        }
+        return true;
+    } else {
+        return false;
+    }
+}
+
+export function typeOf(value: Value): Type {
+    if (value === null) {
+        return NullType;
+    } else if (typeof value === 'string') {
+        return StringType;
+    } else if (typeof value === 'boolean') {
+        return BooleanType;
+    } else if (typeof value === 'number') {
+        return NumberType;
+    } else if (value instanceof Color) {
+        return ColorType;
+    } else if (value instanceof Collator) {
+        return CollatorType;
+    } else if (value instanceof Formatted) {
+        return FormattedType;
+    } else if (value instanceof ResolvedImage) {
+        return ResolvedImageType;
+    } else if (Array.isArray(value)) {
+        const length = value.length;
+        let itemType: Type | typeof undefined;
+
+        for (const item of value) {
+            const t = typeOf(item);
+            if (!itemType) {
+                itemType = t;
+            } else if (itemType === t) {
+                continue;
+            } else {
+                itemType = ValueType;
+                break;
+            }
+        }
+
+        return array(itemType || ValueType, length);
+    } else {
+        assert(typeof value === 'object');
+        return ObjectType;
+    }
+}
+
+export function toString(value: Value): string {
+    const type = typeof value;
+    if (value === null) {
+        return '';
+    } else if (type === 'string' || type === 'number' || type === 'boolean') {
+        return String(value);
+    } else if (value instanceof Color || value instanceof Formatted || value instanceof ResolvedImage) {
+        return value.toString();
+    } else {
+        return JSON.stringify(value);
+    }
+}
+
+export {Color, Collator};