wrote more of the compressor and added some tests

1 files changed, 144 insertions, 0 deletions

diff --git a/test/run-tests.js b/test/run-tests.js
new file mode 100755
index 00000000..b6e8ee2b
--- /dev/null
+++ b/test/run-tests.js
@@ -0,0 +1,144 @@
+#! /usr/bin/env node
+
+var U = require("../tools/node");
+var path = require("path");
+var fs = require("fs");
+var assert = require("assert");
+var sys = require("util");
+
+var tests_dir = path.dirname(module.filename);
+
+run_compress_tests();
+
+/* -----[ utils ]----- */
+
+function tmpl() {
+    return U.string_template.apply(this, arguments);
+}
+
+function log() {
+    var txt = tmpl.apply(this, arguments);
+    sys.puts(txt);
+}
+
+function log_directory(dir) {
+    log("--- Entering [{dir}]", { dir: dir });
+}
+
+function log_start_file(file) {
+    log("*** {file}", { file: file });
+}
+
+function log_test(name) {
+    log("    Running test [{name}]", { name: name });
+}
+
+function find_test_files(dir) {
+    var files = fs.readdirSync(dir).filter(function(name){
+        return /\.js$/i.test(name);
+    });
+    return files;
+}
+
+function test_directory(dir) {
+    return path.resolve(tests_dir, dir);
+}
+
+function run_compress_tests() {
+    var dir = test_directory("compress");
+    log_directory("compress");
+    var files = find_test_files(dir);
+    function test_file(file) {
+        log_start_file(file);
+        function test_case(test) {
+            log_test(test.name);
+            var cmp = new U.Compressor(test.options || {}, true);
+            var expect = make_code(test.expect, false);
+            var output = make_code(test.input.squeeze(cmp), false);
+            if (expect != output) {
+                log("!!! failed\n---INPUT---\n{input}\n---OUTPUT---\n{output}\n---EXPECTED---\n{expected}\n\n", {
+                    input: make_code(test.input),
+                    output: output,
+                    expected: expect
+                });
+            }
+        }
+        var tests = parse_test(path.resolve(dir, file));
+        for (var i in tests) if (tests.hasOwnProperty(i)) {
+            test_case(tests[i]);
+        }
+    }
+    files.forEach(function(file){
+        test_file(file);
+    });
+}
+
+function parse_test(file) {
+    var script = fs.readFileSync(file, "utf8");
+    var ast = U.parse(script);
+    var tests = {};
+    var tw = new U.TreeWalker(function(node, descend){
+        if (node instanceof U.AST_LabeledStatement
+            && tw.parent() instanceof U.AST_Toplevel) {
+            var name = node.label.name;
+            tests[name] = get_one_test(name, node.statement);
+            return true;
+        }
+        if (!(node instanceof U.AST_Toplevel)) croak(node);
+    });
+    ast.walk(tw);
+    return tests;
+
+    function croak(node) {
+        throw new Error(tmpl("Can't understand test file {file} [{line},{col}]\n{code}", {
+            file: file,
+            line: node.start.line,
+            col: node.start.col,
+            code: make_code(node, false)
+        }));
+    }
+
+    function get_one_test(name, block) {
+        var test = { name: name, options: {} };
+        var tw = new U.TreeWalker(function(node, descend){
+            if (node instanceof U.AST_Assign) {
+                if (!(node.left instanceof U.AST_SymbolRef)) {
+                    croak(node);
+                }
+                var name = node.left.name;
+                test[name] = evaluate(node.right);
+                return true;
+            }
+            if (node instanceof U.AST_LabeledStatement) {
+                assert.ok(
+                    node.label.name == "input" || node.label.name == "expect",
+                    tmpl("Unsupported label {name} [{line},{col}]", {
+                        name: node.label.name,
+                        line: node.label.start.line,
+                        col: node.label.start.col
+                    })
+                );
+                var stat = node.statement;
+                if (stat instanceof U.AST_BlockStatement)
+                    stat.required = 1;
+                test[node.label.name] = stat;
+                return true;
+            }
+        });
+        block.walk(tw);
+        return test;
+    };
+}
+
+function make_code(ast, beautify) {
+    if (arguments.length == 1) beautify = true;
+    var stream = U.OutputStream({ beautify: beautify });
+    ast.print(stream);
+    return stream.get();
+}
+
+function evaluate(code) {
+    if (code instanceof U.AST_Node)
+        code = make_code(code);
+    return new Function("return(" + code + ")")();
+}