Function parser

docs/app/js/sanddance-app.js:143285–143313

(expr, scope)

expressionFunction("vlSelectionResolve", (0, _vegaSelections.selectionResolve), (0, _vegaSelections.selectionVisitor));
expressionFunction("vlSelectionTuples", (0, _vegaSelections.selectionTuples));
function parser(expr, scope) {
    const params = {}; // parse the expression to an abstract syntax tree (ast)
    let ast;
    try {
        expr = (0, _vegaUtil.isString)(expr) ? expr : (0, _vegaUtil.stringValue)(expr) + "";
        ast = (0, _vegaExpression.parseExpression)(expr);
    } catch (err) {
        (0, _vegaUtil.error)("Expression parse error: " + expr);
    } // analyze ast function calls for dependencies
    ast.visit((node)=>{
        if (node.type !== (0, _vegaExpression.CallExpression)) return;
        const name = node.callee.name, visit = codegenParams.visitors[name];
        if (visit) visit(name, node.arguments, scope, params);
    }); // perform code generation
    const gen = codeGenerator(ast); // collect signal dependencies
    gen.globals.forEach((name)=>{
        const signalName = SignalPrefix + name;
        if (!(0, _vegaUtil.hasOwnProperty)(params, signalName) && scope.getSignal(name)) params[signalName] = scope.signalRef(name);
    }); // return generated expression code and dependencies
    return {
        $expr: (0, _vegaUtil.extend)({
            code: gen.code
        }, scope.options.ast ? {
            ast
        } : null),
        $fields: gen.fields,
        $params: params
    };
}

},{"vega-util":"dPFAY","vega-expression":"ic0a8","d3-geo":"1UFrq","d3-color":"2I9cJ","vega-dataflow":"4kvYg","vega-scale":"evQIv","vega-scenegraph":"gIB0Z","vega-selections":"7uoGs","vega-statistics":"hZmG3","vega-time":"hDlOp","d3-array":"8JMcC","@parcel/transformer-js/src/esmodule-helpers.js":"jA2du"}],"ic0a8":[function(require,module,exports) {
var parcelHelpers = require("@parcel/transformer-js/src/esmodule-helpers.js");