maplibre-gl/src/style/format_section_override.test.ts

import {createExpression, StyleExpression, ZoomConstantExpression} from '../style-spec/expression';
import EvaluationContext from '../style-spec/expression/evaluation_context';
import properties from './style_layer/symbol_style_layer_properties.g';
import {PossiblyEvaluatedPropertyValue} from './properties';
import FormatSectionOverride from './format_section_override';
import EvaluationParameters from './evaluation_parameters';
import {FormattedSection} from '../style-spec/expression/types/formatted';

describe('evaluate', () => {

    test('override constant', () => {
        const defaultColor = {'r': 0, 'g': 1, 'b': 0, 'a': 1};
        const overridenColor = {'r': 1, 'g': 0, 'b': 0, 'a': 1};
        const overriden = new PossiblyEvaluatedPropertyValue(
            properties.paint.properties['text-color'],
            {kind: 'constant', value: defaultColor},
            {zoom: 0, zoomHistory: {}} as EvaluationParameters
        );

        const override = new FormatSectionOverride(overriden);
        const ctx = new EvaluationContext();
        ctx.feature = {} as any;
        ctx.featureState = {};
        expect(override.evaluate(ctx)).toEqual(defaultColor);

        ctx.formattedSection = {textColor: overridenColor} as FormattedSection;
        expect(override.evaluate(ctx)).toEqual(overridenColor);

    });

    test('override expression', () => {
        const warn = console.warn;
        console.warn = (_) => {};
        const defaultColor = {'r': 0, 'g': 0, 'b': 0, 'a': 1};
        const propertyColor = {'r': 1, 'g': 0, 'b': 0, 'a': 1};
        const overridenColor = {'r': 0, 'g': 0, 'b': 1, 'a': 1};
        const styleExpr = createExpression(
            ['get', 'color'],
            properties.paint.properties['text-color'].specification);

        const sourceExpr = new ZoomConstantExpression('source', styleExpr.value as StyleExpression);
        const overriden = new PossiblyEvaluatedPropertyValue(
            properties.paint.properties['text-color'],
            sourceExpr,
            {zoom: 0, zoomHistory: {}} as EvaluationParameters
        );

        const override = new FormatSectionOverride(overriden);
        const ctx = new EvaluationContext();
        ctx.feature = {properties: {}} as any;
        ctx.featureState = {};

        expect(override.evaluate(ctx)).toEqual(defaultColor);

        ctx.feature.properties.color = 'red';
        expect(override.evaluate(ctx)).toEqual(propertyColor);

        ctx.formattedSection = {textColor: overridenColor} as FormattedSection;
        expect(override.evaluate(ctx)).toEqual(overridenColor);

        console.warn = warn;
    });

});