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expr = isString(expr) ? expr : (stringValue(expr) + '');
ast = parse(expr);
} catch (err) {
error('Expression parse error: ' + expr);
}
// analyze ast function calls for dependencies
ast.visit(function visitor(node) {
if (node.type !== CallExpression) return;
var name = node.callee.name,
visit = codegenParams.visitors[name];
if (visit) visit(name, node.arguments, scope, params);
});
// perform code generation
gen = codeGenerator(ast);
// collect signal dependencies
gen.globals.forEach(function(name) {
var signalName = SignalPrefix + name;
if (!hasOwnProperty(params, signalName) && scope.getSignal(name)) {
params[signalName] = scope.signalRef(name);
}
});
// return generated expression code and dependencies
return {
$expr: preamble ? preamble + 'return(' + gen.code + ');' : gen.code,
$fields: gen.fields,
$params: params
};
}
ast.visit(function visitor(node) {
if (node.type !== CallExpression) return;
var name = node.callee.name,
visit = codegenParams.visitors[name];
if (visit) visit(name, node.arguments, scope, params);
});