diff options
Diffstat (limited to 'jetty-util/src/main/java/org/eclipse/jetty/util/StringUtil.java')
| -rw-r--r-- | jetty-util/src/main/java/org/eclipse/jetty/util/StringUtil.java | 183 |
1 files changed, 182 insertions, 1 deletions
diff --git a/jetty-util/src/main/java/org/eclipse/jetty/util/StringUtil.java b/jetty-util/src/main/java/org/eclipse/jetty/util/StringUtil.java index e82b8c9387..9c3315f7cc 100644 --- a/jetty-util/src/main/java/org/eclipse/jetty/util/StringUtil.java +++ b/jetty-util/src/main/java/org/eclipse/jetty/util/StringUtil.java @@ -21,6 +21,8 @@ package org.eclipse.jetty.util; import java.io.UnsupportedEncodingException; import java.nio.charset.Charset; import java.nio.charset.StandardCharsets; +import java.util.ArrayList; +import java.util.List; import org.eclipse.jetty.util.log.Log; import org.eclipse.jetty.util.log.Logger; @@ -721,6 +723,11 @@ public class StringUtil return str.substring(0,maxSize); } + /** + * Parse the string representation of a list using {@link #csvSplit(List,String,int,int)} + * @param s The string to parse, expected to be enclosed as '[...]' + * @return An array of parsed values. + */ public static String[] arrayFromString(String s) { if (s==null) @@ -731,9 +738,183 @@ public class StringUtil if (s.length()==2) return new String[]{}; - return s.substring(1,s.length()-1).split(" *, *"); + return csvSplit(s,1,s.length()-2); + } + + /** + * Parse a CSV string using {@link #csvSplit(List,String, int, int)} + * @param s The string to parse + * @return An array of parsed values. + */ + public static String[] csvSplit(String s) + { + if (s==null) + return null; + return csvSplit(s,0,s.length()); } + /** + * Parse a CSV string using {@link #csvSplit(List,String, int, int)} + * @param s The string to parse + * @param off The offset into the string to start parsing + * @param len The len in characters to parse + * @return An array of parsed values. + */ + public static String[] csvSplit(String s, int off,int len) + { + if (s==null) + return null; + if (off<0 || len<0 || off>s.length()) + throw new IllegalArgumentException(); + + List<String> list = new ArrayList<>(); + csvSplit(list,s,off,len); + return list.toArray(new String[list.size()]); + } + + enum CsvSplitState { PRE_DATA, QUOTE, SLOSH, DATA, WHITE, POST_DATA }; + + /** Split a quoted comma separated string to a list + * <p>Handle <a href="https://www.ietf.org/rfc/rfc4180.txt">rfc4180</a>-like + * CSV strings, with the exceptions:<ul> + * <li>quoted values may contain double quotes escaped with back-slash + * <li>Non-quoted values are trimmed of leading trailing white space + * <li>trailing commas are ignored + * <li>double commas result in a empty string value + * </ul> + * @param list The Collection to split to (or null to get a new list) + * @param s The string to parse + * @param off The offset into the string to start parsing + * @param len The len in characters to parse + * @return list containing the parsed list values + */ + public static List<String> csvSplit(List<String> list,String s, int off,int len) + { + if (list==null) + list=new ArrayList<>(); + CsvSplitState state = CsvSplitState.PRE_DATA; + StringBuilder out = new StringBuilder(); + int last=-1; + while (len>0) + { + char ch = s.charAt(off++); + len--; + + switch(state) + { + case PRE_DATA: + if (Character.isWhitespace(ch)) + continue; + + if ('"'==ch) + { + state=CsvSplitState.QUOTE; + continue; + } + + if (','==ch) + { + list.add(""); + continue; + } + + state=CsvSplitState.DATA; + out.append(ch); + continue; + + case DATA: + if (Character.isWhitespace(ch)) + { + last=out.length(); + out.append(ch); + state=CsvSplitState.WHITE; + continue; + } + + if (','==ch) + { + list.add(out.toString()); + out.setLength(0); + state=CsvSplitState.PRE_DATA; + continue; + } + + out.append(ch); + continue; + + case WHITE: + if (Character.isWhitespace(ch)) + { + out.append(ch); + continue; + } + + if (','==ch) + { + out.setLength(last); + list.add(out.toString()); + out.setLength(0); + state=CsvSplitState.PRE_DATA; + continue; + } + + state=CsvSplitState.DATA; + out.append(ch); + last=-1; + continue; + + case QUOTE: + if ('\\'==ch) + { + state=CsvSplitState.SLOSH; + continue; + } + if ('"'==ch) + { + list.add(out.toString()); + out.setLength(0); + state=CsvSplitState.POST_DATA; + continue; + } + out.append(ch); + continue; + + case SLOSH: + out.append(ch); + state=CsvSplitState.QUOTE; + continue; + + case POST_DATA: + if (','==ch) + { + state=CsvSplitState.PRE_DATA; + continue; + } + continue; + } + } + + switch(state) + { + case PRE_DATA: + case POST_DATA: + break; + + case DATA: + case QUOTE: + case SLOSH: + list.add(out.toString()); + break; + + case WHITE: + out.setLength(last); + list.add(out.toString()); + break; + } + + return list; + } + public static String sanitizeXmlString(String html) { if (html==null) |