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import clone from "../Core/clone.js";
import defined from "../Core/defined.js";
import Expression from "./Expression.js";
/**
* An expression for a style applied to a {@link Cesium3DTileset}.
* <p>
* Evaluates a conditions expression defined using the
* {@link https://github.com/CesiumGS/3d-tiles/tree/main/specification/Styling|3D Tiles Styling language}.
* </p>
* <p>
* Implements the {@link StyleExpression} interface.
* </p>
*
* @alias ConditionsExpression
* @constructor
*
* @param {object} [conditionsExpression] The conditions expression defined using the 3D Tiles Styling language.
* @param {object} [defines] Defines in the style.
*
* @example
* const expression = new Cesium.ConditionsExpression({
* conditions : [
* ['${Area} > 10, 'color("#FF0000")'],
* ['${id} !== "1"', 'color("#00FF00")'],
* ['true', 'color("#FFFFFF")']
* ]
* });
* expression.evaluateColor(feature, result); // returns a Cesium.Color object
*/
function ConditionsExpression(conditionsExpression, defines) {
this._conditionsExpression = clone(conditionsExpression, true);
this._conditions = conditionsExpression.conditions;
this._runtimeConditions = undefined;
setRuntime(this, defines);
}
Object.defineProperties(ConditionsExpression.prototype, {
/**
* Gets the conditions expression defined in the 3D Tiles Styling language.
*
* @memberof ConditionsExpression.prototype
*
* @type {object}
* @readonly
*
* @default undefined
*/
conditionsExpression: {
get: function () {
return this._conditionsExpression;
},
},
});
function Statement(condition, expression) {
this.condition = condition;
this.expression = expression;
}
function setRuntime(expression, defines) {
const runtimeConditions = [];
const conditions = expression._conditions;
if (!defined(conditions)) {
return;
}
const length = conditions.length;
for (let i = 0; i < length; ++i) {
const statement = conditions[i];
const cond = String(statement[0]);
const condExpression = String(statement[1]);
runtimeConditions.push(
new Statement(
new Expression(cond, defines),
new Expression(condExpression, defines),
),
);
}
expression._runtimeConditions = runtimeConditions;
}
/**
* Evaluates the result of an expression, optionally using the provided feature's properties. If the result of
* the expression in the
* {@link https://github.com/CesiumGS/3d-tiles/tree/main/specification/Styling|3D Tiles Styling language}
* is of type <code>Boolean</code>, <code>Number</code>, or <code>String</code>, the corresponding JavaScript
* primitive type will be returned. If the result is a <code>RegExp</code>, a Javascript <code>RegExp</code>
* object will be returned. If the result is a <code>Cartesian2</code>, <code>Cartesian3</code>, or <code>Cartesian4</code>,
* a {@link Cartesian2}, {@link Cartesian3}, or {@link Cartesian4} object will be returned. If the <code>result</code> argument is
* a {@link Color}, the {@link Cartesian4} value is converted to a {@link Color} and then returned.
*
* @param {Cesium3DTileFeature} feature The feature whose properties may be used as variables in the expression.
* @param {object} [result] The object onto which to store the result.
* @returns {boolean|number|string|RegExp|Cartesian2|Cartesian3|Cartesian4|Color} The result of evaluating the expression.
*/
ConditionsExpression.prototype.evaluate = function (feature, result) {
const conditions = this._runtimeConditions;
if (!defined(conditions)) {
return undefined;
}
const length = conditions.length;
for (let i = 0; i < length; ++i) {
const statement = conditions[i];
if (statement.condition.evaluate(feature)) {
return statement.expression.evaluate(feature, result);
}
}
};
/**
* Evaluates the result of a Color expression, using the values defined by a feature.
* <p>
* This is equivalent to {@link ConditionsExpression#evaluate} but always returns a {@link Color} object.
* </p>
* @param {Cesium3DTileFeature} feature The feature whose properties may be used as variables in the expression.
* @param {Color} [result] The object in which to store the result
* @returns {Color} The modified result parameter or a new Color instance if one was not provided.
*/
ConditionsExpression.prototype.evaluateColor = function (feature, result) {
const conditions = this._runtimeConditions;
Iif (!defined(conditions)) {
return undefined;
}
const length = conditions.length;
for (let i = 0; i < length; ++i) {
const statement = conditions[i];
if (statement.condition.evaluate(feature)) {
return statement.expression.evaluateColor(feature, result);
}
}
};
/**
* Gets the shader function for this expression.
* Returns undefined if the shader function can't be generated from this expression.
*
* @param {string} functionSignature Signature of the generated function.
* @param {object} variableSubstitutionMap Maps variable names to shader variable names.
* @param {object} shaderState Stores information about the generated shader function, including whether it is translucent.
* @param {string} returnType The return type of the generated function.
*
* @returns {string} The shader function.
*
* @private
*/
ConditionsExpression.prototype.getShaderFunction = function (
functionSignature,
variableSubstitutionMap,
shaderState,
returnType,
) {
const conditions = this._runtimeConditions;
if (!defined(conditions) || conditions.length === 0) {
return undefined;
}
let shaderFunction = "";
const length = conditions.length;
for (let i = 0; i < length; ++i) {
const statement = conditions[i];
const condition = statement.condition.getShaderExpression(
variableSubstitutionMap,
shaderState,
);
const expression = statement.expression.getShaderExpression(
variableSubstitutionMap,
shaderState,
);
// Build the if/else chain from the list of conditions
shaderFunction +=
` ${i === 0 ? "if" : "else if"} (${condition})\n` +
` {\n` +
` return ${expression};\n` +
` }\n`;
}
shaderFunction =
`${returnType} ${functionSignature}\n` +
`{\n${shaderFunction} return ${returnType}(1.0);\n` + // Return a default value if no conditions are met
`}\n`;
return shaderFunction;
};
/**
* Gets the variables used by the expression.
*
* @returns {string[]} The variables used by the expression.
*
* @private
*/
ConditionsExpression.prototype.getVariables = function () {
let variables = [];
const conditions = this._runtimeConditions;
if (!defined(conditions) || conditions.length === 0) {
return variables;
}
const length = conditions.length;
for (let i = 0; i < length; ++i) {
const statement = conditions[i];
addAllToArray(variables, statement.condition.getVariables());
addAllToArray(variables, statement.expression.getVariables());
}
// Remove duplicates
variables = variables.filter(function (variable, index, variables) {
return variables.indexOf(variable) === index;
});
return variables;
};
export default ConditionsExpression;
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