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/*
* Copyright 2019, Continual.io
*
* 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.
*/
package io.continual.util.data;
import java.util.LinkedList;
import java.util.List;
import io.continual.util.data.exprEval.EnvDataSource;
import io.continual.util.data.exprEval.ExprDataSource;
import io.continual.util.data.exprEval.ExpressionEvaluator;
import io.continual.util.data.exprEval.SpecialFnsDataSource;
import io.continual.util.nv.NvReadable;
public class StringUtils
{
/**
* Return true if the string is not empty.
* @param s
* @return true if the string is not null and not empty
*/
public static boolean isNotEmpty ( String s )
{
return s != null && s.length () > 0;
}
/**
* Return true if the string is empty or null
* @param s
* @return true if the string is empty or null
*/
public static boolean isEmpty ( String s )
{
return !isNotEmpty ( s );
}
/**
* If the input string is null, return an empty string. Otherwise return the input string.
* @param s
* @return a non-null string
*/
public static String emptyIfNull ( String s )
{
return s == null ? "" : s;
}
/**
* Return s, up to the first occurrence of delim. If delim does not occur, s
* is returned in full.
*
* @param s original string
* @param delim the delimiter
* @return s, up to the first occurrence of delim
*/
public static String substringTo ( String s, char delim )
{
final int found = s.indexOf ( delim );
return ( found > -1 ) ? s.substring ( 0, found ) : s;
}
public static int isOneOf ( char c, char[] set )
{
int result = -1;
for ( result = 0; result < set.length && c != set[result]; result++ )
{
}
return result >= set.length ? -1 : result;
}
public static int indexOfAnyOf ( String s, char[] chars )
{
return indexOfAnyOf ( s, chars, 0 );
}
public static int indexOfAnyOf ( String s, char[] chars, int fromIndex )
{
int result = -1;
for ( int i = fromIndex; i < s.length () && result == -1; i++ )
{
final int one = isOneOf ( s.charAt ( i ), chars );
if ( -1 != one )
{
result = i;
}
}
return result;
}
public static String toFirstUpperRestLower ( String s )
{
return toFirstUpper ( s == null ? null : s.toLowerCase () );
}
public static String toFirstUpper ( String s )
{
if ( s == null )
return s;
final int len = s.length ();
if ( len == 0 )
{
return s;
}
final StringBuffer sb = new StringBuffer ();
sb.append ( Character.toUpperCase ( s.charAt ( 0 ) ) );
if ( len > 1 )
{
sb.append ( s.substring ( 1 ) );
}
return sb.toString ();
}
/**
* Remove surrounding quotes, either double quote or single quote, if one occurs
* on both ends of the string. This method does *not* deal with escaped internal quotes.
* @param s
* @return an unquoted string
*/
public static String dequote ( String s )
{
return dequote ( s, new char [] { '"', '\'' } );
}
/**
* Remove surrounding characters, if one occurs on both ends of the string.
* This method does *not* deal with escaped internal quotes.
* @param s
* @param quoteChars chars considered quotes
* @return an unquoted string
*/
public static String dequote ( String s, char[] quoteChars )
{
String result = s;
if ( indexOfAnyOf ( s, quoteChars ) == 0 )
{
final char leading = s.charAt ( 0 );
if ( s.charAt ( s.length () - 1 ) == leading )
{
result = s.substring ( 1, s.length () - 1 );
}
}
return result;
}
public static String[] splitList ( String s )
{
final List resultList = splitListToList ( s );
return resultList.toArray ( new String [resultList.size ()] );
}
public static String[] splitList ( String s, char[] separators, char[] quoteChars )
{
final List resultList = splitListToList ( s, separators, quoteChars );
return resultList.toArray ( new String [resultList.size ()] );
}
public static List splitListToList ( String s )
{
return splitListToList ( s, new char [] { ',', ';' }, new char [] { '\'', '"' } );
}
public static List splitListToList ( String s, char[] separators, char[] quoteChars )
{
final LinkedList resultList = new LinkedList ();
String remains = s;
while ( remains.length () > 0 )
{
valueInfo vi = getLeadingValue ( remains, quoteChars, separators );
if ( vi != null )
{
if ( vi.fValue == null )
{
vi = new valueInfo ( "", vi.fNextFieldAt );
}
resultList.add ( vi.fValue.trim () );
if ( vi.fNextFieldAt > -1 )
{
remains = remains.substring ( vi.fNextFieldAt ).trim ();
}
else
{
remains = "";
}
}
}
return resultList;
}
public static class valueInfo
{
public valueInfo ()
{
this ( null, -1 );
}
public valueInfo ( String val, int next )
{
fValue = val;
fNextFieldAt = next;
}
public final String fValue;
public final int fNextFieldAt;
}
public static valueInfo getLeadingValue ( String from )
{
return getLeadingValue ( from, '\"', ',' );
}
public static valueInfo getLeadingValue ( String from, char quoteChar, char delimChar )
{
return getLeadingValue ( from, new char [] { quoteChar }, new char [] { delimChar } );
}
public static valueInfo getLeadingValue ( String from, char[] quoteChars, char[] delimChars )
{
valueInfo vi = new valueInfo ();
if ( from.length () > 0 )
{
char current = from.charAt ( 0 );
final int quoteId = isOneOf ( current, quoteChars );
boolean quoted = ( quoteId != -1 );
if ( quoted )
{
final char quoteChar = quoteChars[quoteId];
// scan for close quote
int foundEnd = -1;
int quoteScanFrom = 1;
while ( -1 == foundEnd )
{
int quote = from.indexOf ( quoteChar, quoteScanFrom );
if ( quote == -1 )
{
// improper format!
break;
}
else
{
// check if this is a double quote inside the string or
// if this quote terminates the field
if ( quote + 1 < from.length () && from.charAt ( quote + 1 ) == quoteChar )
{
quoteScanFrom = quote + 2;
}
else
{
foundEnd = quote;
}
}
}
if ( foundEnd > -1 )
{
StringBuffer fixedUp = new StringBuffer ();
String val = from.substring ( 1, foundEnd );
boolean lastWasQuote = false;
for ( int i = 0; i < val.length (); i++ )
{
char c = val.charAt ( i );
if ( c == quoteChar )
{
if ( !lastWasQuote )
{
fixedUp.append ( c );
}
// else: drop it
lastWasQuote = !lastWasQuote;
}
else
{
fixedUp.append ( c );
lastWasQuote = false;
}
}
final int nextFieldAt = indexOfAnyOf ( from, delimChars, foundEnd + 1 );
vi = new valueInfo ( fixedUp.toString (), nextFieldAt != -1 ? nextFieldAt + 1 : nextFieldAt );
}
}
else
{
// scan for delimiter
int delim = indexOfAnyOf ( from, delimChars );
if ( delim == -1 )
{
vi = new valueInfo ( from, -1 );
}
else
{
if ( delim == 0 )
{
vi = new valueInfo ( null, 1 );
}
else
{
vi = new valueInfo ( from.substring ( 0, delim ), delim + 1 );
}
}
}
}
return vi;
}
public static class fieldInfo
{
public fieldInfo ( String val, int startPos )
{
fValue = val;
fStartsAt = startPos;
}
public String toString ()
{
return fValue + " [" + fStartsAt + "]";
}
public final String fValue;
public final int fStartsAt;
}
public static List split ( String from, char quoteChar, char delimChar )
{
final LinkedList result = new LinkedList ();
String remains = from;
int pos = 0;
while ( remains.length () > 0 )
{
final valueInfo vi = getLeadingValue ( remains, quoteChar, delimChar );
final fieldInfo fi = new fieldInfo ( vi.fValue, pos );
result.add ( fi );
if ( vi.fNextFieldAt > -1 )
{
pos += vi.fNextFieldAt;
remains = remains.substring ( vi.fNextFieldAt );
}
else
{
remains = "";
}
}
return result;
}
public interface charSelector
{
boolean select ( Character c );
}
public static int indexOf ( String s, charSelector cc )
{
final int len = s.length ();
int current = 0;
while ( current < len )
{
final Character currChar = s.charAt ( current );
if ( cc.select ( currChar ) )
{
return current;
}
current++;
}
return -1;
}
public static String evaluate ( NvReadable data, String val )
{
return ExpressionEvaluator.evaluateText (
val,
new ExprDataSource ()
{
public Object eval ( String label )
{
return data.getString ( label, null );
}
},
new EnvDataSource (),
new SpecialFnsDataSource ()
);
}
public static String limitLengthTo ( String s, int maxlen )
{
final int len = s.length ();
if ( len > maxlen )
{
return s.substring ( 0, maxlen );
}
return s;
}
public static String appendIfMissing ( String base, String ending )
{
return ( base.endsWith ( ending ) ? base : base + ending );
}
private StringUtils() {
}
}
