freeipa/install/ui/util/uglifyjs/lib/squeeze-more.js

var jsp = require("./parse-js"),
    pro = require("./process"),
    slice = jsp.slice,
    member = jsp.member,
    curry = jsp.curry,
    MAP = pro.MAP,
    PRECEDENCE = jsp.PRECEDENCE,
    OPERATORS = jsp.OPERATORS;

function ast_squeeze_more(ast) {
    var w = pro.ast_walker(), walk = w.walk, scope;
    function with_scope(s, cont) {
        var save = scope, ret;
        scope = s;
        ret = cont();
        scope = save;
        return ret;
    };
    function _lambda(name, args, body) {
        return [ this[0], name, args, with_scope(body.scope, curry(MAP, body, walk)) ];
    };
    return w.with_walkers({
        "toplevel": function(body) {
            return [ this[0], with_scope(this.scope, curry(MAP, body, walk)) ];
        },
        "function": _lambda,
        "defun": _lambda,
        "new": function(ctor, args) {
            if (ctor[0] == "name") {
                if (ctor[1] == "Array" && !scope.has("Array")) {
                    if (args.length != 1) {
                        return [ "array", args ];
                    } else {
                        return walk([ "call", [ "name", "Array" ], args ]);
                    }
                } else if (ctor[1] == "Object" && !scope.has("Object")) {
                    if (!args.length) {
                        return [ "object", [] ];
                    } else {
                        return walk([ "call", [ "name", "Object" ], args ]);
                    }
                } else if ((ctor[1] == "RegExp" || ctor[1] == "Function" || ctor[1] == "Error") && !scope.has(ctor[1])) {
                    return walk([ "call", [ "name", ctor[1] ], args]);
                }
            }
        },
        "call": function(expr, args) {
            if (expr[0] == "dot" && expr[1][0] == "string" && args.length == 1
                && (args[0][1] > 0 && expr[2] == "substring" || expr[2] == "substr")) {
                return [ "call", [ "dot", expr[1], "slice"], args];
            }
            if (expr[0] == "dot" && expr[2] == "toString" && args.length == 0) {
                // foo.toString()  ==>  foo+""
                if (expr[1][0] == "string") return expr[1];
                return [ "binary", "+", expr[1], [ "string", "" ]];
            }
            if (expr[0] == "name") {
                if (expr[1] == "Array" && args.length != 1 && !scope.has("Array")) {
                    return [ "array", args ];
                }
                if (expr[1] == "Object" && !args.length && !scope.has("Object")) {
                    return [ "object", [] ];
                }
                if (expr[1] == "String" && !scope.has("String")) {
                    return [ "binary", "+", args[0], [ "string", "" ]];
                }
            }
        }
    }, function() {
        return walk(pro.ast_add_scope(ast));
    });
};

exports.ast_squeeze_more = ast_squeeze_more;

// Local variables:
// js-indent-level: 4
// End: