/*
* Copyright (C) 2010, Mathias Kinzler <mathias.kinzler@sap.com>
* Copyright (C) 2009, Constantine Plotnikov <constantine.plotnikov@gmail.com>
* Copyright (C) 2007, Dave Watson <dwatson@mimvista.com>
* Copyright (C) 2008-2010, Google Inc.
* Copyright (C) 2009, Google, Inc.
* Copyright (C) 2009, JetBrains s.r.o.
* Copyright (C) 2007-2008, Robin Rosenberg <robin.rosenberg@dewire.com>
* Copyright (C) 2006-2008, Shawn O. Pearce <spearce@spearce.org>
* Copyright (C) 2008, Thad Hughes <thadh@thad.corp.google.com>
* and other copyright owners as documented in the project's IP log.
*
* This program and the accompanying materials are made available
* under the terms of the Eclipse Distribution License v1.0 which
* accompanies this distribution, is reproduced below, and is
* available at http://www.eclipse.org/org/documents/edl-v10.php
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* - Neither the name of the Eclipse Foundation, Inc. nor the
* names of its contributors may be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.eclipse.jgit.lib;
import java.text.MessageFormat;
import java.util.AbstractSet;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.atomic.AtomicReference;
import org.eclipse.jgit.JGitText;
import org.eclipse.jgit.errors.ConfigInvalidException;
import org.eclipse.jgit.events.ConfigChangedEvent;
import org.eclipse.jgit.events.ConfigChangedListener;
import org.eclipse.jgit.events.ListenerHandle;
import org.eclipse.jgit.events.ListenerList;
import org.eclipse.jgit.util.StringUtils;
/**
* Git style {@code .config}, {@code .gitconfig}, {@code .gitmodules} file.
*/
public class Config {
private static final String[] EMPTY_STRING_ARRAY = {};
private static final long KiB = 1024;
private static final long MiB = 1024 * KiB;
private static final long GiB = 1024 * MiB;
/** the change listeners */
private final ListenerList listeners = new ListenerList();
/**
* Immutable current state of the configuration data.
* <p>
* This state is copy-on-write. It should always contain an immutable list
* of the configuration keys/values.
*/
private final AtomicReference<State> state;
private final Config baseConfig;
/**
* Magic value indicating a missing entry.
* <p>
* This value is tested for reference equality in some contexts, so we
* must ensure it is a special copy of the empty string. It also must
* be treated like the empty string.
*/
private static final String MAGIC_EMPTY_VALUE = new String();
/** Create a configuration with no default fallback. */
public Config() {
this(null);
}
/**
* Create an empty configuration with a fallback for missing keys.
*
* @param defaultConfig
* the base configuration to be consulted when a key is missing
* from this configuration instance.
*/
public Config(Config defaultConfig) {
baseConfig = defaultConfig;
state = new AtomicReference<State>(newState());
}
/**
* Escape the value before saving
*
* @param x
* the value to escape
* @return the escaped value
*/
private static String escapeValue(final String x) {
boolean inquote = false;
int lineStart = 0;
final StringBuilder r = new StringBuilder(x.length());
for (int k = 0; k < x.length(); k++) {
final char c = x.charAt(k);
switch (c) {
case '\n':
if (inquote) {
r.append('"');
inquote = false;
}
r.append("\\n\\\n");
lineStart = r.length();
break;
case '\t':
r.append("\\t");
break;
case '\b':
r.append("\\b");
break;
case '\\':
r.append("\\\\");
break;
case '"':
r.append("\\\"");
break;
case ';':
case '#':
if (!inquote) {
r.insert(lineStart, '"');
inquote = true;
}
r.append(c);
break;
case ' ':
if (!inquote && r.length() > 0
&& r.charAt(r.length() - 1) == ' ') {
r.insert(lineStart, '"');
inquote = true;
}
r.append(' ');
break;
default:
r.append(c);
break;
}
}
if (inquote) {
r.append('"');
}
return r.toString();
}
/**
* Obtain an integer value from the configuration.
*
* @param section
* section the key is grouped within.
* @param name
* name of the key to get.
* @param defaultValue
* default value to return if no value was present.
* @return an integer value from the configuration, or defaultValue.
*/
public int getInt(final String section, final String name,
final int defaultValue) {
return getInt(section, null, name, defaultValue);
}
/**
* Obtain an integer value from the configuration.
*
* @param section
* section the key is grouped within.
* @param subsection
* subsection name, such a remote or branch name.
* @param name
* name of the key to get.
* @param defaultValue
* default value to return if no value was present.
* @return an integer value from the configuration, or defaultValue.
*/
public int getInt(final String section, String subsection,
final String name, final int defaultValue) {
final long val = getLong(section, subsection, name, defaultValue);
if (Integer.MIN_VALUE <= val && val <= Integer.MAX_VALUE)
return (int) val;
throw new IllegalArgumentException(MessageFormat.format(JGitText.get().integerValueOutOfRange
, section, name));
}
/**
* Obtain an integer value from the configuration.
*
* @param section
* section the key is grouped within.
* @param name
* name of the key to get.
* @param defaultValue
* default value to return if no value was present.
* @return an integer value from the configuration, or defaultValue.
*/
public long getLong(String section, String name, long defaultValue) {
return getLong(section, null, name, defaultValue);
}
/**
* Obtain an integer value from the configuration.
*
* @param section
* section the key is grouped within.
* @param subsection
* subsection name, such a remote or branch name.
* @param name
* name of the key to get.
* @param defaultValue
* default value to return if no value was present.
* @return an integer value from the configuration, or defaultValue.
*/
public long getLong(final String section, String subsection,
final String name, final long defaultValue) {
final String str = getString(section, subsection, name);
if (str == null)
return defaultValue;
String n = str.trim();
if (n.length() == 0)
return defaultValue;
long mul = 1;
switch (StringUtils.toLowerCase(n.charAt(n.length() - 1))) {
case 'g':
mul = GiB;
break;
case 'm':
mul = MiB;
break;
case 'k':
mul = KiB;
break;
}
if (mul > 1)
n = n.substring(0, n.length() - 1).trim();
if (n.length() == 0)
return defaultValue;
try {
return mul * Long.parseLong(n);
} catch (NumberFormatException nfe) {
throw new IllegalArgumentException(MessageFormat.format(JGitText.get().invalidIntegerValue
, section, name, str));
}
}
/**
* Get a boolean value from the git config
*
* @param section
* section the key is grouped within.
* @param name
* name of the key to get.
* @param defaultValue
* default value to return if no value was present.
* @return true if any value or defaultValue is true, false for missing or
* explicit false
*/
public boolean getBoolean(final String section, final String name,
final boolean defaultValue) {
return getBoolean(section, null, name, defaultValue);
}
/**
* Get a boolean value from the git config
*
* @param section
* section the key is grouped within.
* @param subsection
* subsection name, such a remote or branch name.
* @param name
* name of the key to get.
* @param defaultValue
* default value to return if no value was present.
* @return true if any value or defaultValue is true, false for missing or
* explicit false
*/
public boolean getBoolean(final String section, String subsection,
final String name, final boolean defaultValue) {
String n = getRawString(section, subsection, name);
if (n == null)
return defaultValue;
if (MAGIC_EMPTY_VALUE == n)
return true;
try {
return StringUtils.toBoolean(n);
} catch (IllegalArgumentException err) {
throw new IllegalArgumentException(MessageFormat.format(JGitText.get().invalidBooleanValue
, section, name, n));
}
}
/**
* Parse an enumeration from the configuration.
*
* @param <T>
* type of the enumeration object.
* @param section
* section the key is grouped within.
* @param subsection
* subsection name, such a remote or branch name.
* @param name
* name of the key to get.
* @param defaultValue
* default value to return if no value was present.
* @return the selected enumeration value, or {@code defaultValue}.
*/
public <T extends Enum<?>> T getEnum(final String section,
final String subsection, final String name, final T defaultValue) {
final T[] all = allValuesOf(defaultValue);
return getEnum(all, section, subsection, name, defaultValue);
}
@SuppressWarnings("unchecked")
private static <T> T[] allValuesOf(final T value) {
try {
return (T[]) value.getClass().getMethod("values").invoke(null);
} catch (Exception err) {
String typeName = value.getClass().getName();
String msg = MessageFormat.format(
JGitText.get().enumValuesNotAvailable, typeName);
throw new IllegalArgumentException(msg, err);
}
}
/**
* Parse an enumeration from the configuration.
*
* @param <T>
* type of the enumeration object.
* @param all
* all possible values in the enumeration which should be
* recognized. Typically {@code EnumType.values()}.
* @param section
* section the key is grouped within.
* @param subsection
* subsection name, such a remote or branch name.
* @param name
* name of the key to get.
* @param defaultValue
* default value to return if no value was present.
* @return the selected enumeration value, or {@code defaultValue}.
*/
public <T extends Enum<?>> T getEnum(final T[] all, final String section,
final String subsection, final String name, final T defaultValue) {
String value = getString(section, subsection, name);
if (value == null)
return defaultValue;
String n = value.replace(' ', '_');
T trueState = null;
T falseState = null;
for (T e : all) {
if (StringUtils.equalsIgnoreCase(e.name(), n))
return e;
else if (StringUtils.equalsIgnoreCase(e.name(), "TRUE"))
trueState = e;
else if (StringUtils.equalsIgnoreCase(e.name(), "FALSE"))
falseState = e;
}
// This is an odd little fallback. C Git sometimes allows boolean
// values in a tri-state with other things. If we have both a true
// and a false value in our enumeration, assume its one of those.
//
if (trueState != null && falseState != null) {
try {
return StringUtils.toBoolean(n) ? trueState : falseState;
} catch (IllegalArgumentException err) {
// Fall through and use our custom error below.
}
}
if (subsection != null)
throw new IllegalArgumentException(MessageFormat.format(JGitText
.get().enumValueNotSupported3, section, name, value));
else
throw new IllegalArgumentException(MessageFormat.format(JGitText
.get().enumValueNotSupported2, section, name, value));
}
/**
* Get string value
*
* @param section
* the section
* @param subsection
* the subsection for the value
* @param name
* the key name
* @return a String value from git config.
*/
public String getString(final String section, String subsection,
final String name) {
return getRawString(section, subsection, name);
}
/**
* Get a list of string values
* <p>
* If this instance was created with a base, the base's values are returned
* first (if any).
*
* @param section
* the section
* @param subsection
* the subsection for the value
* @param name
* the key name
* @return array of zero or more values from the configuration.
*/
public String[] getStringList(final String section, String subsection,
final String name) {
final String[] baseList;
if (baseConfig != null)
baseList = baseConfig.getStringList(section, subsection, name);
else
baseList = EMPTY_STRING_ARRAY;
final List<String> lst = getRawStringList(section, subsection, name);
if (lst != null) {
final String[] res = new String[baseList.length + lst.size()];
int idx = baseList.length;
System.arraycopy(baseList, 0, res, 0, idx);
for (final String val : lst)
res[idx++] = val;
return res;
}
return baseList;
}
/**
* @param section
* section to search for.
* @return set of all subsections of specified section within this
* configuration and its base configuration; may be empty if no
* subsection exists.
*/
public Set<String> getSubsections(final String section) {
return get(new SubsectionNames(section));
}
/**
* @return the sections defined in this {@link Config}
*/
public Set<String> getSections() {
return get(new SectionNames());
}
/**
* @param section
* the section
* @return the list of names defined for this section
*/
public Set<String> getNames(String section) {
return getNames(section, null);
}
/**
* @param section
* the section
* @param subsection
* the subsection
* @return the list of names defined for this subsection
*/
public Set<String> getNames(String section, String subsection) {
return get(new NamesInSection(section, subsection));
}
/**
* Obtain a handle to a parsed set of configuration values.
*
* @param <T>
* type of configuration model to return.
* @param parser
* parser which can create the model if it is not already
* available in this configuration file. The parser is also used
* as the key into a cache and must obey the hashCode and equals
* contract in order to reuse a parsed model.
* @return the parsed object instance, which is cached inside this config.
*/
@SuppressWarnings("unchecked")
public <T> T get(final SectionParser<T> parser) {
final State myState = getState();
T obj = (T) myState.cache.get(parser);
if (obj == null) {
obj = parser.parse(this);
myState.cache.put(parser, obj);
}
return obj;
}
/**
* Remove a cached configuration object.
* <p>
* If the associated configuration object has not yet been cached, this
* method has no effect.
*
* @param parser
* parser used to obtain the configuration object.
* @see #get(SectionParser)
*/
public void uncache(final SectionParser<?> parser) {
state.get().cache.remove(parser);
}
/**
* Adds a listener to be notified about changes.
* <p>
* Clients are supposed to remove the listeners after they are done with
* them using the {@link ListenerHandle#remove()} method
*
* @param listener
* the listener
* @return the handle to the registered listener
*/
public ListenerHandle addChangeListener(ConfigChangedListener listener) {
return listeners.addConfigChangedListener(listener);
}
/**
* Determine whether to issue change events for transient changes.
* <p>
* If <code>true</code> is returned (which is the default behavior),
* {@link #fireConfigChangedEvent()} will be called upon each change.
* <p>
* Subclasses that override this to return <code>false</code> are
* responsible for issuing {@link #fireConfigChangedEvent()} calls
* themselves.
*
* @return <code></code>
*/
protected boolean notifyUponTransientChanges() {
return true;
}
/**
* Notifies the listeners
*/
protected void fireConfigChangedEvent() {
listeners.dispatch(new ConfigChangedEvent());
}
private String getRawString(final String section, final String subsection,
final String name) {
final List<String> lst = getRawStringList(section, subsection, name);
if (lst != null)
return lst.get(0);
else if (baseConfig != null)
return baseConfig.getRawString(section, subsection, name);
else
return null;
}
private List<String> getRawStringList(final String section,
final String subsection, final String name) {
List<String> r = null;
for (final Entry e : state.get().entryList) {
if (e.match(section, subsection, name))
r = add(r, e.value);
}
return r;
}
private static List<String> add(final List<String> curr, final String value) {
if (curr == null)
return Collections.singletonList(value);
if (curr.size() == 1) {
final List<String> r = new ArrayList<String>(2);
r.add(curr.get(0));
r.add(value);
return r;
}
curr.add(value);
return curr;
}
private State getState() {
State cur, upd;
do {
cur = state.get();
final State base = getBaseState();
if (cur.baseState == base)
return cur;
upd = new State(cur.entryList, base);
} while (!state.compareAndSet(cur, upd));
return upd;
}
private State getBaseState() {
return baseConfig != null ? baseConfig.getState() : null;
}
/**
* Add or modify a configuration value. The parameters will result in a
* configuration entry like this.
*
* <pre>
* [section "subsection"]
* name = value
* </pre>
*
* @param section
* section name, e.g "branch"
* @param subsection
* optional subsection value, e.g. a branch name
* @param name
* parameter name, e.g. "filemode"
* @param value
* parameter value
*/
public void setInt(final String section, final String subsection,
final String name, final int value) {
setLong(section, subsection, name, value);
}
/**
* Add or modify a configuration value. The parameters will result in a
* configuration entry like this.
*
* <pre>
* [section "subsection"]
* name = value
* </pre>
*
* @param section
* section name, e.g "branch"
* @param subsection
* optional subsection value, e.g. a branch name
* @param name
* parameter name, e.g. "filemode"
* @param value
* parameter value
*/
public void setLong(final String section, final String subsection,
final String name, final long value) {
final String s;
if (value >= GiB && (value % GiB) == 0)
s = String.valueOf(value / GiB) + " g";
else if (value >= MiB && (value % MiB) == 0)
s = String.valueOf(value / MiB) + " m";
else if (value >= KiB && (value % KiB) == 0)
s = String.valueOf(value / KiB) + " k";
else
s = String.valueOf(value);
setString(section, subsection, name, s);
}
/**
* Add or modify a configuration value. The parameters will result in a
* configuration entry like this.
*
* <pre>
* [section "subsection"]
* name = value
* </pre>
*
* @param section
* section name, e.g "branch"
* @param subsection
* optional subsection value, e.g. a branch name
* @param name
* parameter name, e.g. "filemode"
* @param value
* parameter value
*/
public void setBoolean(final String section, final String subsection,
final String name, final boolean value) {
setString(section, subsection, name, value ? "true" : "false");
}
/**
* Add or modify a configuration value. The parameters will result in a
* configuration entry like this.
*
* <pre>
* [section "subsection"]
* name = value
* </pre>
*
* @param <T>
* type of the enumeration object.
* @param section
* section name, e.g "branch"
* @param subsection
* optional subsection value, e.g. a branch name
* @param name
* parameter name, e.g. "filemode"
* @param value
* parameter value
*/
public <T extends Enum<?>> void setEnum(final String section,
final String subsection, final String name, final T value) {
String n = value.name().toLowerCase().replace('_', ' ');
setString(section, subsection, name, n);
}
/**
* Add or modify a configuration value. The parameters will result in a
* configuration entry like this.
*
* <pre>
* [section "subsection"]
* name = value
* </pre>
*
* @param section
* section name, e.g "branch"
* @param subsection
* optional subsection value, e.g. a branch name
* @param name
* parameter name, e.g. "filemode"
* @param value
* parameter value, e.g. "true"
*/
public void setString(final String section, final String subsection,
final String name, final String value) {
setStringList(section, subsection, name, Collections
.singletonList(value));
}
/**
* Remove a configuration value.
*
* @param section
* section name, e.g "branch"
* @param subsection
* optional subsection value, e.g. a branch name
* @param name
* parameter name, e.g. "filemode"
*/
public void unset(final String section, final String subsection,
final String name) {
setStringList(section, subsection, name, Collections
.<String> emptyList());
}
/**
* Remove all configuration values under a single section.
*
* @param section
* section name, e.g "branch"
* @param subsection
* optional subsection value, e.g. a branch name
*/
public void unsetSection(String section, String subsection) {
State src, res;
do {
src = state.get();
res = unsetSection(src, section, subsection);
} while (!state.compareAndSet(src, res));
}
private State unsetSection(final State srcState, final String section,
final String subsection) {
final int max = srcState.entryList.size();
final ArrayList<Entry> r = new ArrayList<Entry>(max);
boolean lastWasMatch = false;
for (Entry e : srcState.entryList) {
if (e.match(section, subsection)) {
// Skip this record, it's for the section we are removing.
lastWasMatch = true;
continue;
}
if (lastWasMatch && e.section == null && e.subsection == null)
continue; // skip this padding line in the section.
r.add(e);
}
return newState(r);
}
/**
* Set a configuration value.
*
* <pre>
* [section "subsection"]
* name = value
* </pre>
*
* @param section
* section name, e.g "branch"
* @param subsection
* optional subsection value, e.g. a branch name
* @param name
* parameter name, e.g. "filemode"
* @param values
* list of zero or more values for this key.
*/
public void setStringList(final String section, final String subsection,
final String name, final List<String> values) {
State src, res;
do {
src = state.get();
res = replaceStringList(src, section, subsection, name, values);
} while (!state.compareAndSet(src, res));
if (notifyUponTransientChanges())
fireConfigChangedEvent();
}
private State replaceStringList(final State srcState,
final String section, final String subsection, final String name,
final List<String> values) {
final List<Entry> entries = copy(srcState, values);
int entryIndex = 0;
int valueIndex = 0;
int insertPosition = -1;
// Reset the first n Entry objects that match this input name.
//
while (entryIndex < entries.size() && valueIndex < values.size()) {
final Entry e = entries.get(entryIndex);
if (e.match(section, subsection, name)) {
entries.set(entryIndex, e.forValue(values.get(valueIndex++)));
insertPosition = entryIndex + 1;
}
entryIndex++;
}
// Remove any extra Entry objects that we no longer need.
//
if (valueIndex == values.size() && entryIndex < entries.size()) {
while (entryIndex < entries.size()) {
final Entry e = entries.get(entryIndex++);
if (e.match(section, subsection, name))
entries.remove(--entryIndex);
}
}
// Insert new Entry objects for additional/new values.
//
if (valueIndex < values.size() && entryIndex == entries.size()) {
if (insertPosition < 0) {
// We didn't find a matching key above, but maybe there
// is already a section available that matches. Insert
// after the last key of that section.
//
insertPosition = findSectionEnd(entries, section, subsection);
}
if (insertPosition < 0) {
// We didn't find any matching section header for this key,
// so we must create a new section header at the end.
//
final Entry e = new Entry();
e.section = section;
e.subsection = subsection;
entries.add(e);
insertPosition = entries.size();
}
while (valueIndex < values.size()) {
final Entry e = new Entry();
e.section = section;
e.subsection = subsection;
e.name = name;
e.value = values.get(valueIndex++);
entries.add(insertPosition++, e);
}
}
return newState(entries);
}
private static List<Entry> copy(final State src, final List<String> values) {
// At worst we need to insert 1 line for each value, plus 1 line
// for a new section header. Assume that and allocate the space.
//
final int max = src.entryList.size() + values.size() + 1;
final ArrayList<Entry> r = new ArrayList<Entry>(max);
r.addAll(src.entryList);
return r;
}
private static int findSectionEnd(final List<Entry> entries,
final String section, final String subsection) {
for (int i = 0; i < entries.size(); i++) {
Entry e = entries.get(i);
if (e.match(section, subsection, null)) {
i++;
while (i < entries.size()) {
e = entries.get(i);
if (e.match(section, subsection, e.name))
i++;
else
break;
}
return i;
}
}
return -1;
}
/**
* @return this configuration, formatted as a Git style text file.
*/
public String toText() {
final StringBuilder out = new StringBuilder();
for (final Entry e : state.get().entryList) {
if (e.prefix != null)
out.append(e.prefix);
if (e.section != null && e.name == null) {
out.append('[');
out.append(e.section);
if (e.subsection != null) {
out.append(' ');
String escaped = escapeValue(e.subsection);
// make sure to avoid double quotes here
boolean quoted = escaped.startsWith("\"")
&& escaped.endsWith("\"");
if (!quoted)
out.append('"');
out.append(escaped);
if (!quoted)
out.append('"');
}
out.append(']');
} else if (e.section != null && e.name != null) {
if (e.prefix == null || "".equals(e.prefix))
out.append('\t');
out.append(e.name);
if (MAGIC_EMPTY_VALUE != e.value) {
out.append(" =");
if (e.value != null) {
out.append(' ');
out.append(escapeValue(e.value));
}
}
if (e.suffix != null)
out.append(' ');
}
if (e.suffix != null)
out.append(e.suffix);
out.append('\n');
}
return out.toString();
}
/**
* Clear this configuration and reset to the contents of the parsed string.
*
* @param text
* Git style text file listing configuration properties.
* @throws ConfigInvalidException
* the text supplied is not formatted correctly. No changes were
* made to {@code this}.
*/
public void fromText(final String text) throws ConfigInvalidException {
final List<Entry> newEntries = new ArrayList<Entry>();
final StringReader in = new StringReader(text);
Entry last = null;
Entry e = new Entry();
for (;;) {
int input = in.read();
if (-1 == input)
break;
final char c = (char) input;
if ('\n' == c) {
// End of this entry.
newEntries.add(e);
if (e.section != null)
last = e;
e = new Entry();
} else if (e.suffix != null) {
// Everything up until the end-of-line is in the suffix.
e.suffix += c;
} else if (';' == c || '#' == c) {
// The rest of this line is a comment; put into suffix.
e.suffix = String.valueOf(c);
} else if (e.section == null && Character.isWhitespace(c)) {
// Save the leading whitespace (if any).
if (e.prefix == null)
e.prefix = "";
e.prefix += c;
} else if ('[' == c) {
// This is a section header.
e.section = readSectionName(in);
input = in.read();
if ('"' == input) {
e.subsection = readValue(in, true, '"');
input = in.read();
}
if (']' != input)
throw new ConfigInvalidException(JGitText.get().badGroupHeader);
e.suffix = "";
} else if (last != null) {
// Read a value.
e.section = last.section;
e.subsection = last.subsection;
in.reset();
e.name = readKeyName(in);
if (e.name.endsWith("\n")) {
e.name = e.name.substring(0, e.name.length() - 1);
e.value = MAGIC_EMPTY_VALUE;
} else
e.value = readValue(in, false, -1);
} else
throw new ConfigInvalidException(JGitText.get().invalidLineInConfigFile);
}
state.set(newState(newEntries));
}
private State newState() {
return new State(Collections.<Entry> emptyList(), getBaseState());
}
private State newState(final List<Entry> entries) {
return new State(Collections.unmodifiableList(entries), getBaseState());
}
/**
* Clear the configuration file
*/
protected void clear() {
state.set(newState());
}
private static String readSectionName(final StringReader in)
throws ConfigInvalidException {
final StringBuilder name = new StringBuilder();
for (;;) {
int c = in.read();
if (c < 0)
throw new ConfigInvalidException(JGitText.get().unexpectedEndOfConfigFile);
if (']' == c) {
in.reset();
break;
}
if (' ' == c || '\t' == c) {
for (;;) {
c = in.read();
if (c < 0)
throw new ConfigInvalidException(JGitText.get().unexpectedEndOfConfigFile);
if ('"' == c) {
in.reset();
break;
}
if (' ' == c || '\t' == c)
continue; // Skipped...
throw new ConfigInvalidException(MessageFormat.format(JGitText.get().badSectionEntry, name));
}
break;
}
if (Character.isLetterOrDigit((char) c) || '.' == c || '-' == c)
name.append((char) c);
else
throw new ConfigInvalidException(MessageFormat.format(JGitText.get().badSectionEntry, name));
}
return name.toString();
}
private static String readKeyName(final StringReader in)
throws ConfigInvalidException {
final StringBuilder name = new StringBuilder();
for (;;) {
int c = in.read();
if (c < 0)
throw new ConfigInvalidException(JGitText.get().unexpectedEndOfConfigFile);
if ('=' == c)
break;
if (' ' == c || '\t' == c) {
for (;;) {
c = in.read();
if (c < 0)
throw new ConfigInvalidException(JGitText.get().unexpectedEndOfConfigFile);
if ('=' == c)
break;
if (';' == c || '#' == c || '\n' == c) {
in.reset();
break;
}
if (' ' == c || '\t' == c)
continue; // Skipped...
throw new ConfigInvalidException(JGitText.get().badEntryDelimiter);
}
break;
}
if (Character.isLetterOrDigit((char) c) || c == '-') {
// From the git-config man page:
// The variable names are case-insensitive and only
// alphanumeric characters and - are allowed.
name.append((char) c);
} else if ('\n' == c) {
in.reset();
name.append((char) c);
break;
} else
throw new ConfigInvalidException(MessageFormat.format(JGitText.get().badEntryName, name));
}
return name.toString();
}
private static String readValue(final StringReader in, boolean quote,
final int eol) throws ConfigInvalidException {
final StringBuilder value = new StringBuilder();
boolean space = false;
for (;;) {
int c = in.read();
if (c < 0) {
if (value.length() == 0)
throw new ConfigInvalidException(JGitText.get().unexpectedEndOfConfigFile);
break;
}
if ('\n' == c) {
if (quote)
throw new ConfigInvalidException(JGitText.get().newlineInQuotesNotAllowed);
in.reset();
break;
}
if (eol == c)
break;
if (!quote) {
if (Character.isWhitespace((char) c)) {
space = true;
continue;
}
if (';' == c || '#' == c) {
in.reset();
break;
}
}
if (space) {
if (value.length() > 0)
value.append(' ');
space = false;
}
if ('\\' == c) {
c = in.read();
switch (c) {
case -1:
throw new ConfigInvalidException(JGitText.get().endOfFileInEscape);
case '\n':
continue;
case 't':
value.append('\t');
continue;
case 'b':
value.append('\b');
continue;
case 'n':
value.append('\n');
continue;
case '\\':
value.append('\\');
continue;
case '"':
value.append('"');
continue;
default:
throw new ConfigInvalidException(MessageFormat.format(JGitText.get().badEscape, ((char) c)));
}
}
if ('"' == c) {
quote = !quote;
continue;
}
value.append((char) c);
}
return value.length() > 0 ? value.toString() : null;
}
/**
* Parses a section of the configuration into an application model object.
* <p>
* Instances must implement hashCode and equals such that model objects can
* be cached by using the {@code SectionParser} as a key of a HashMap.
* <p>
* As the {@code SectionParser} itself is used as the key of the internal
* HashMap applications should be careful to ensure the SectionParser key
* does not retain unnecessary application state which may cause memory to
* be held longer than expected.
*
* @param <T>
* type of the application model created by the parser.
*/
public static interface SectionParser<T> {
/**
* Create a model object from a configuration.
*
* @param cfg
* the configuration to read values from.
* @return the application model instance.
*/
T parse(Config cfg);
}
private static class SubsectionNames implements SectionParser<Set<String>> {
private final String section;
SubsectionNames(final String sectionName) {
section = sectionName;
}
public int hashCode() {
return section.hashCode();
}
public boolean equals(Object other) {
if (other instanceof SubsectionNames) {
return section.equals(((SubsectionNames) other).section);
}
return false;
}
public Set<String> parse(Config cfg) {
final Set<String> result = new LinkedHashSet<String>();
while (cfg != null) {
for (final Entry e : cfg.state.get().entryList) {
if (e.subsection != null && e.name == null
&& StringUtils.equalsIgnoreCase(section, e.section))
result.add(e.subsection);
}
cfg = cfg.baseConfig;
}
return Collections.unmodifiableSet(result);
}
}
private static class NamesInSection implements SectionParser<Set<String>> {
private final String section;
private final String subsection;
NamesInSection(final String sectionName, final String subSectionName) {
section = sectionName;
subsection = subSectionName;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + section.hashCode();
result = prime * result
+ ((subsection == null) ? 0 : subsection.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
NamesInSection other = (NamesInSection) obj;
if (!section.equals(other.section))
return false;
if (subsection == null) {
if (other.subsection != null)
return false;
} else if (!subsection.equals(other.subsection))
return false;
return true;
}
public Set<String> parse(Config cfg) {
final Map<String, String> m = new LinkedHashMap<String, String>();
while (cfg != null) {
for (final Entry e : cfg.state.get().entryList) {
if (e.name == null)
continue;
if (!StringUtils.equalsIgnoreCase(section, e.section))
continue;
if ((subsection == null && e.subsection == null)
|| (subsection != null && subsection
.equals(e.subsection))) {
String lc = StringUtils.toLowerCase(e.name);
if (!m.containsKey(lc))
m.put(lc, e.name);
}
}
cfg = cfg.baseConfig;
}
return new CaseFoldingSet(m);
}
}
private static class SectionNames implements SectionParser<Set<String>> {
public Set<String> parse(Config cfg) {
final Map<String, String> m = new LinkedHashMap<String, String>();
while (cfg != null) {
for (final Entry e : cfg.state.get().entryList) {
if (e.section != null) {
String lc = StringUtils.toLowerCase(e.section);
if (!m.containsKey(lc))
m.put(lc, e.section);
}
}
cfg = cfg.baseConfig;
}
return new CaseFoldingSet(m);
}
}
private static class CaseFoldingSet extends AbstractSet<String> {
private final Map<String, String> names;
CaseFoldingSet(Map<String, String> names) {
this.names = Collections.unmodifiableMap(names);
}
@Override
public boolean contains(Object needle) {
if (!(needle instanceof String))
return false;
String n = (String) needle;
return names.containsKey(n)
|| names.containsKey(StringUtils.toLowerCase(n));
}
@Override
public Iterator<String> iterator() {
return names.values().iterator();
}
@Override
public int size() {
return names.size();
}
}
private static class State {
final List<Entry> entryList;
final Map<Object, Object> cache;
final State baseState;
State(List<Entry> entries, State base) {
entryList = entries;
cache = new ConcurrentHashMap<Object, Object>(16, 0.75f, 1);
baseState = base;
}
}
/**
* The configuration file entry
*/
private static class Entry {
/**
* The text content before entry
*/
String prefix;
/**
* The section name for the entry
*/
String section;
/**
* Subsection name
*/
String subsection;
/**
* The key name
*/
String name;
/**
* The value
*/
String value;
/**
* The text content after entry
*/
String suffix;
Entry forValue(final String newValue) {
final Entry e = new Entry();
e.prefix = prefix;
e.section = section;
e.subsection = subsection;
e.name = name;
e.value = newValue;
e.suffix = suffix;
return e;
}
boolean match(final String aSection, final String aSubsection,
final String aKey) {
return eqIgnoreCase(section, aSection)
&& eqSameCase(subsection, aSubsection)
&& eqIgnoreCase(name, aKey);
}
boolean match(final String aSection, final String aSubsection) {
return eqIgnoreCase(section, aSection)
&& eqSameCase(subsection, aSubsection);
}
private static boolean eqIgnoreCase(final String a, final String b) {
if (a == null && b == null)
return true;
if (a == null || b == null)
return false;
return StringUtils.equalsIgnoreCase(a, b);
}
private static boolean eqSameCase(final String a, final String b) {
if (a == null && b == null)
return true;
if (a == null || b == null)
return false;
return a.equals(b);
}
}
private static class StringReader {
private final char[] buf;
private int pos;
StringReader(final String in) {
buf = in.toCharArray();
}
int read() {
try {
return buf[pos++];
} catch (ArrayIndexOutOfBoundsException e) {
pos = buf.length;
return -1;
}
}
void reset() {
pos--;
}
}
}