upload android base code part3

android/bootable/recovery/edify/edify_parser.cpp

@@ -0,0 +1,79 @@
+/*
+ * Copyright (C) 2009 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * This is a host-side tool for validating a given edify script file.
+ *
+ * We used to have edify test cases here, which have been moved to
+ * tests/component/edify_test.cpp.
+ *
+ * Caveat: It doesn't recognize functions defined through updater, which
+ * makes the tool less useful. We should either extend the tool or remove it.
+ */
+
+#include <errno.h>
+#include <stdio.h>
+
+#include <memory>
+#include <string>
+
+#include <android-base/file.h>
+
+#include "expr.h"
+
+static void ExprDump(int depth, const std::unique_ptr<Expr>& n, const std::string& script) {
+    printf("%*s", depth*2, "");
+    printf("%s %p (%d-%d) \"%s\"\n",
+           n->name.c_str(), n->fn, n->start, n->end,
+           script.substr(n->start, n->end - n->start).c_str());
+    for (size_t i = 0; i < n->argv.size(); ++i) {
+        ExprDump(depth+1, n->argv[i], script);
+    }
+}
+
+int main(int argc, char** argv) {
+    RegisterBuiltins();
+
+    if (argc != 2) {
+        printf("Usage: %s <edify script>\n", argv[0]);
+        return 1;
+    }
+
+    std::string buffer;
+    if (!android::base::ReadFileToString(argv[1], &buffer)) {
+        printf("%s: failed to read %s: %s\n", argv[0], argv[1], strerror(errno));
+        return 1;
+    }
+
+    std::unique_ptr<Expr> root;
+    int error_count = 0;
+    int error = parse_string(buffer.data(), &root, &error_count);
+    printf("parse returned %d; %d errors encountered\n", error, error_count);
+    if (error == 0 || error_count > 0) {
+
+        ExprDump(0, root, buffer);
+
+        State state(buffer, nullptr);
+        std::string result;
+        if (!Evaluate(&state, root, &result)) {
+            printf("result was NULL, message is: %s\n",
+                   (state.errmsg.empty() ? "(NULL)" : state.errmsg.c_str()));
+        } else {
+            printf("result is [%s]\n", result.c_str());
+        }
+    }
+    return 0;
+}