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Added node modules
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138
node_modules/uglify-js/tmp/instrument2.js
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138
node_modules/uglify-js/tmp/instrument2.js
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// sample on how to use the parser and walker API to instrument some code
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var jsp = require("uglify-js").parser;
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var pro = require("uglify-js").uglify;
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function instrument(code) {
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var ast = jsp.parse(code, false, true); // true for the third arg specifies that we want
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// to have start/end tokens embedded in the
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// statements
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var w = pro.ast_walker();
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function trace (line, comment) {
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var code = pro.gen_code(line, { beautify: true });
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var data = line[0]
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var args = []
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if (!comment) comment = ""
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if (typeof data === "object") {
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code = code.split(/\n/).shift()
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args = [ [ "string", data.toString() ],
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[ "string", code ],
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[ "num", data.start.line ],
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[ "num", data.start.col ],
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[ "num", data.end.line ],
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[ "num", data.end.col ]]
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} else {
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args = [ [ "string", data ],
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[ "string", code ]]
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}
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return [ "call", [ "name", "trace" ], args ];
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}
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// we're gonna need this to push elements that we're currently looking at, to avoid
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// endless recursion.
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var analyzing = [];
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function do_stat() {
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var ret;
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if (this[0].start && analyzing.indexOf(this) < 0) {
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// without the `analyzing' hack, w.walk(this) would re-enter here leading
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// to infinite recursion
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analyzing.push(this);
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ret = [ "splice",
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[ [ "stat", trace(this) ],
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w.walk(this) ]];
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analyzing.pop(this);
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}
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return ret;
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}
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function do_cond(c, t, f) {
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return [ this[0], w.walk(c),
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["seq", trace(t), w.walk(t) ],
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["seq", trace(f), w.walk(f) ]];
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}
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function do_binary(c, l, r) {
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if (c !== "&&" && c !== "||") {
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return [this[0], c, w.walk(l), w.walk(r)];
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}
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return [ this[0], c,
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["seq", trace(l), w.walk(l) ],
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["seq", trace(r), w.walk(r) ]];
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}
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var new_ast = w.with_walkers({
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"stat" : do_stat,
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"label" : do_stat,
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"break" : do_stat,
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"continue" : do_stat,
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"debugger" : do_stat,
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"var" : do_stat,
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"const" : do_stat,
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"return" : do_stat,
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"throw" : do_stat,
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"try" : do_stat,
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"defun" : do_stat,
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"if" : do_stat,
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"while" : do_stat,
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"do" : do_stat,
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"for" : do_stat,
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"for-in" : do_stat,
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"switch" : do_stat,
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"with" : do_stat,
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"conditional" : do_cond,
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"binary" : do_binary
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}, function(){
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return w.walk(ast);
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});
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return pro.gen_code(new_ast, { beautify: true });
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}
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////// test code follows.
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var code = instrument(test.toString());
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console.log(code);
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function test() {
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// simple stats
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a = 5;
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c += a + b;
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"foo";
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// var
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var foo = 5;
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const bar = 6, baz = 7;
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// switch block. note we can't track case lines the same way.
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switch ("foo") {
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case "foo":
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return 1;
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case "bar":
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return 2;
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}
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// for/for in
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for (var i = 0; i < 5; ++i) {
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console.log("Hello " + i);
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}
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for (var i in [ 1, 2, 3]) {
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console.log(i);
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}
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for (var i = 0; i < 5; ++i)
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console.log("foo");
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for (var i = 0; i < 5; ++i) {
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console.log("foo");
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}
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var k = plurp() ? 1 : 0;
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var x = a ? doX(y) && goZoo("zoo")
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: b ? blerg({ x: y })
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: null;
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var x = X || Y;
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}
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