hopper/lib/ast/node.js

An interpreter for the Grace programming language

var Task, prim, rt, util;

Task = require("../task");
prim = require("../runtime/primitives");
rt = require("../runtime");
util = require("../util");

// Top-level abstract Node constructor, used as a type in Grace.
function Node(located) {
  this.location = located.location;
}

// A list of nodes, equivalent to a standard list but can also accept visitors.
function NodeList(nodes) {
  Node.call(this, nodes[0]);
  prim.List.call(this, nodes);
}

util.inherits(NodeList, prim.List);

NodeList.prototype.accept = rt.method("accept()", [[1, 1]], function (part) {
  return Task.each(this.object.nodes, function (node) {
    return node.accept(part);
  }).then(function (list) {
    return rt.list(list);
  });
});

// Abstract statement constructor, used as a type in Grace.
function Statement(located) {
  Node.call(this, located);
}

util.inherits(Statement, Node);

// Abstract expression constructor, used as a type in Grace.
// All expressions are valid statements.
function Expression(located) {
  Statement.call(this, located);
}

util.inherits(Expression, Statement);