src/jdk.jdeps/share/classes/com/sun/tools/jdeprscan/CSV.java
changeset 47216 71c04702a3d5
parent 40596 43b19b36e8e6
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.jdeps/share/classes/com/sun/tools/jdeprscan/CSV.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,147 @@
+/*
+ * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package com.sun.tools.jdeprscan;
+
+import java.io.PrintStream;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.stream.Collectors;
+
+/**
+ * Utility class for manipulating comma-separated-value (CSV) data.
+ */
+public class CSV {
+    static String quote(String input) {
+        String result;
+        boolean needQuote = input.contains(",");
+
+        if (input.contains("\"")) {
+            needQuote = true;
+            result = input.replace("\"", "\"\"");
+        } else {
+            result = input;
+        }
+
+        if (needQuote) {
+            return "\"" + result + "\"";
+        } else {
+            return result;
+        }
+    }
+
+    /**
+     * Writes the objects' string representations to the output as a line of CSV.
+     * The objects are converted to String, quoted if necessary, joined with commas,
+     * and are written to the output followed by the line separator string.
+     *
+     * @param out the output destination
+     * @param objs the objects to write
+     */
+    public static void write(PrintStream out, Object... objs) {
+        out.println(Arrays.stream(objs)
+                          .map(Object::toString)
+                          .map(CSV::quote)
+                          .collect(Collectors.joining(",")));
+    }
+
+    /**
+     * The CSV parser state.
+     */
+    enum State {
+        START_FIELD, // the start of a field
+        IN_FIELD,    // within an unquoted field
+        IN_QFIELD,   // within a quoted field
+        END_QFIELD   // after the end of a quoted field
+    }
+
+    /**
+     * Splits an input line into a list of strings, handling quoting.
+     *
+     * @param input the input line
+     * @return the resulting list of strings
+     */
+    public static List<String> split(String input) {
+        List<String> result = new ArrayList<>();
+        StringBuilder cur = new StringBuilder();
+        State state = State.START_FIELD;
+
+        for (int i = 0; i < input.length(); i++) {
+            char ch = input.charAt(i);
+            switch (ch) {
+                case ',':
+                    switch (state) {
+                        case IN_QFIELD:
+                            cur.append(',');
+                            break;
+                        default:
+                            result.add(cur.toString());
+                            cur.setLength(0);
+                            state = State.START_FIELD;
+                            break;
+                    }
+                    break;
+                case '"':
+                    switch (state) {
+                        case START_FIELD:
+                            state = State.IN_QFIELD;
+                            break;
+                        case IN_QFIELD:
+                            state = State.END_QFIELD;
+                            break;
+                        case IN_FIELD:
+                            throw new CSVParseException("unexpected quote", input, i);
+                        case END_QFIELD:
+                            cur.append('"');
+                            state = State.IN_QFIELD;
+                            break;
+                    }
+                    break;
+                default:
+                    switch (state) {
+                        case START_FIELD:
+                            state = State.IN_FIELD;
+                            break;
+                        case IN_FIELD:
+                        case IN_QFIELD:
+                            break;
+                        case END_QFIELD:
+                            throw new CSVParseException("extra character after quoted string",
+                                                        input, i);
+                    }
+                    cur.append(ch);
+                    break;
+            }
+        }
+
+        if (state == State.IN_QFIELD) {
+            throw new CSVParseException("unclosed quote", input, input.length());
+        }
+
+        result.add(cur.toString());
+        return result;
+    }
+}