/usr/lib/nodejs/uglify-js/bin/extract-props.js is in node-uglify 2.7.5-2+deb9u1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 | #!/usr/bin/nodejs
"use strict";
var U2 = require("../tools/node");
var fs = require("fs");
var yargs = require("yargs");
var ARGS = yargs
.describe("o", "Output file")
.argv;
var files = ARGS._.slice();
var output = {
vars: {},
props: {}
};
if (ARGS.o) try {
output = JSON.parse(fs.readFileSync(ARGS.o, "utf8"));
} catch(ex) {}
files.forEach(getProps);
if (ARGS.o) {
fs.writeFileSync(ARGS.o, JSON.stringify(output, null, 2), "utf8");
} else {
console.log("%s", JSON.stringify(output, null, 2));
}
function getProps(filename) {
var code = fs.readFileSync(filename, "utf8");
var ast = U2.parse(code);
ast.walk(new U2.TreeWalker(function(node){
if (node instanceof U2.AST_ObjectKeyVal) {
add(node.key);
}
else if (node instanceof U2.AST_ObjectProperty) {
add(node.key.name);
}
else if (node instanceof U2.AST_Dot) {
add(node.property);
}
else if (node instanceof U2.AST_Sub) {
addStrings(node.property);
}
}));
function addStrings(node) {
var out = {};
try {
(function walk(node){
node.walk(new U2.TreeWalker(function(node){
if (node instanceof U2.AST_Seq) {
walk(node.cdr);
return true;
}
if (node instanceof U2.AST_String) {
add(node.value);
return true;
}
if (node instanceof U2.AST_Conditional) {
walk(node.consequent);
walk(node.alternative);
return true;
}
throw out;
}));
})(node);
} catch(ex) {
if (ex !== out) throw ex;
}
}
function add(name) {
output.props[name] = true;
}
}
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