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(function (tree) {
tree.JavaScript = function (string, index, escaped) {
this.escaped = escaped;
this.expression = string;
this.index = index;
};
tree.JavaScript.prototype = {
eval: function (env) {
var result,
that = this,
context = {};
var expression = this.expression.replace(/@\{([\w-]+)\}/g, function (_, name) {
return tree.jsify(new(tree.Variable)('@' + name, that.index).eval(env));
});
try {
expression = new(Function)('return (' + expression + ')');
} catch (e) {
throw { message: "JavaScript evaluation error: `" + expression + "`" ,
index: this.index };
}
for (var k in env.frames[0].variables()) {
context[k.slice(1)] = {
value: env.frames[0].variables()[k].value,
toJS: function () {
return this.value.eval(env).toCSS();
}
};
}
try {
result = expression.call(context);
} catch (e) {
throw { message: "JavaScript evaluation error: '" + e.name + ': ' + e.message + "'" ,
index: this.index };
}
if (typeof(result) === 'string') {
return new(tree.Quoted)('"' + result + '"', result, this.escaped, this.index);
} else if (Array.isArray(result)) {
return new(tree.Anonymous)(result.join(', '));
} else {
return new(tree.Anonymous)(result);
}
}
};
})(require('../tree'));
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