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