less/lib/less/tree/call.js

Leaner CSS

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var tslib_1 = require("tslib");
var node_1 = tslib_1.__importDefault(require("./node"));
var anonymous_1 = tslib_1.__importDefault(require("./anonymous"));
var function_caller_1 = tslib_1.__importDefault(require("../functions/function-caller"));
//
// A function call node.
//
var Call = function (name, args, index, currentFileInfo) {
    this.name = name;
    this.args = args;
    this.calc = name === 'calc';
    this._index = index;
    this._fileInfo = currentFileInfo;
};
Call.prototype = Object.assign(new node_1.default(), {
    type: 'Call',
    accept: function (visitor) {
        if (this.args) {
            this.args = visitor.visitArray(this.args);
        }
    },
    //
    // When evaluating a function call,
    // we either find the function in the functionRegistry,
    // in which case we call it, passing the  evaluated arguments,
    // if this returns null or we cannot find the function, we
    // simply print it out as it appeared originally [2].
    //
    // The reason why we evaluate the arguments, is in the case where
    // we try to pass a variable to a function, like: `saturate(@color)`.
    // The function should receive the value, not the variable.
    //
    eval: function (context) {
        var _this = this;
        /**
         * Turn off math for calc(), and switch back on for evaluating nested functions
         */
        var currentMathContext = context.mathOn;
        context.mathOn = !this.calc;
        if (this.calc || context.inCalc) {
            context.enterCalc();
        }
        var exitCalc = function () {
            if (_this.calc || context.inCalc) {
                context.exitCalc();
            }
            context.mathOn = currentMathContext;
        };
        var result;
        var funcCaller = new function_caller_1.default(this.name, context, this.getIndex(), this.fileInfo());
        if (funcCaller.isValid()) {
            try {
                result = funcCaller.call(this.args);
                exitCalc();
            }
            catch (e) {
                // eslint-disable-next-line no-prototype-builtins
                if (e.hasOwnProperty('line') && e.hasOwnProperty('column')) {
                    throw e;
                }
                throw {
                    type: e.type || 'Runtime',
                    message: "Error evaluating function `".concat(this.name, "`").concat(e.message ? ": ".concat(e.message) : ''),
                    index: this.getIndex(),
                    filename: this.fileInfo().filename,
                    line: e.lineNumber,
                    column: e.columnNumber
                };
            }
        }
        if (result !== null && result !== undefined) {
            // Results that that are not nodes are cast as Anonymous nodes
            // Falsy values or booleans are returned as empty nodes
            if (!(result instanceof node_1.default)) {
                if (!result || result === true) {
                    result = new anonymous_1.default(null);
                }
                else {
                    result = new anonymous_1.default(result.toString());
                }
            }
            result._index = this._index;
            result._fileInfo = this._fileInfo;
            return result;
        }
        var args = this.args.map(function (a) { return a.eval(context); });
        exitCalc();
        return new Call(this.name, args, this.getIndex(), this.fileInfo());
    },
    genCSS: function (context, output) {
        output.add("".concat(this.name, "("), this.fileInfo(), this.getIndex());
        for (var i = 0; i < this.args.length; i++) {
            this.args[i].genCSS(context, output);
            if (i + 1 < this.args.length) {
                output.add(', ');
            }
        }
        output.add(')');
    }
});
exports.default = Call;
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