From 25dadc85140b1f688a4cf0c2de8b961a07b10f11 Mon Sep 17 00:00:00 2001
From: Peter Mount <peter@retep.org.uk>
Date: Mon, 17 Apr 2000 20:07:56 +0000
Subject: Another attempt at 7.0

---
 .../jdbc/org/postgresql/util/PGtokenizer.java      | 197 +++++++++++++++++++++
 1 file changed, 197 insertions(+)
 create mode 100644 src/interfaces/jdbc/org/postgresql/util/PGtokenizer.java

(limited to 'src/interfaces/jdbc/org/postgresql/util/PGtokenizer.java')

diff --git a/src/interfaces/jdbc/org/postgresql/util/PGtokenizer.java b/src/interfaces/jdbc/org/postgresql/util/PGtokenizer.java
new file mode 100644
index 0000000000..b9d1bb68ff
--- /dev/null
+++ b/src/interfaces/jdbc/org/postgresql/util/PGtokenizer.java
@@ -0,0 +1,197 @@
+package org.postgresql.util;
+
+import java.sql.*;
+import java.util.*;
+
+/**
+ * This class is used to tokenize the text output of org.postgres.
+ *
+ * <p>It's mainly used by the geometric classes, but is useful in parsing any
+ * output from custom data types output from org.postgresql.
+ *
+ * @see org.postgresql.geometric.PGbox
+ * @see org.postgresql.geometric.PGcircle
+ * @see org.postgresql.geometric.PGlseg
+ * @see org.postgresql.geometric.PGpath
+ * @see org.postgresql.geometric.PGpoint
+ * @see org.postgresql.geometric.PGpolygon
+ */
+public class PGtokenizer
+{
+  // Our tokens
+  protected Vector	tokens;
+  
+  /**
+   * Create a tokeniser.
+   *
+   * <p>We could have used StringTokenizer to do this, however, we needed to
+   * handle nesting of '(' ')' '[' ']' '&lt;' and '&gt;' as these are used
+   * by the geometric data types.
+   *
+   * @param string containing tokens
+   * @param delim single character to split the tokens
+   */
+  public PGtokenizer(String string,char delim)
+  {
+    tokenize(string,delim);
+  }
+  
+  /**
+   * This resets this tokenizer with a new string and/or delimiter.
+   *
+   * @param string containing tokens
+   * @param delim single character to split the tokens
+   */
+  public int tokenize(String string,char delim)
+  {
+    tokens = new Vector();
+    
+    // nest holds how many levels we are in the current token.
+    // if this is > 0 then we don't split a token when delim is matched.
+    //
+    // The Geometric datatypes use this, because often a type may have others
+    // (usualls PGpoint) imbedded within a token.
+    //
+    // Peter 1998 Jan 6 - Added < and > to the nesting rules
+    int nest=0,p,s;
+    
+    for(p=0,s=0;p<string.length();p++) {
+      char c = string.charAt(p);
+      
+      // increase nesting if an open character is found
+      if(c == '(' || c == '[' || c == '<')
+	nest++;
+      
+      // decrease nesting if a close character is found
+      if(c == ')' || c == ']' || c == '>')
+	nest--;
+      
+      if(nest==0 && c==delim) {
+	tokens.addElement(string.substring(s,p));
+	s=p+1; // +1 to skip the delimiter
+      }
+      
+    }
+    
+    // Don't forget the last token ;-)
+    if(s<string.length())
+      tokens.addElement(string.substring(s));
+    
+    return tokens.size();
+  }
+  
+  /**
+   * @return the number of tokens available
+   */
+  public int getSize()
+  {
+    return tokens.size();
+  }
+  
+  /**
+   * @param n Token number ( 0 ... getSize()-1 )
+   * @return The token value
+   */
+  public String getToken(int n)
+  {
+    return (String)tokens.elementAt(n);
+  }
+  
+  /**
+   * This returns a new tokenizer based on one of our tokens.
+   *
+   * The geometric datatypes use this to process nested tokens (usually
+   * PGpoint).
+   *
+   * @param n Token number ( 0 ... getSize()-1 )
+   * @param delim The delimiter to use
+   * @return A new instance of PGtokenizer based on the token
+   */
+  public PGtokenizer tokenizeToken(int n,char delim)
+  {
+    return new PGtokenizer(getToken(n),delim);
+  }
+  
+  /**
+   * This removes the lead/trailing strings from a string
+   * @param s Source string
+   * @param l Leading string to remove
+   * @param t Trailing string to remove
+   * @return String without the lead/trailing strings
+   */
+  public static String remove(String s,String l,String t)
+  {
+    if(s.startsWith(l))	s = s.substring(l.length());
+    if(s.endsWith(t))	s = s.substring(0,s.length()-t.length());
+    return s;
+  }
+  
+  /**
+   * This removes the lead/trailing strings from all tokens
+   * @param l Leading string to remove
+   * @param t Trailing string to remove
+   */
+  public void remove(String l,String t)
+  {
+    for(int i=0;i<tokens.size();i++) {
+      tokens.setElementAt(remove((String)tokens.elementAt(i),l,t),i);
+    }
+  }
+  
+  /**
+   * Removes ( and ) from the beginning and end of a string
+   * @param s String to remove from
+   * @return String without the ( or )
+   */
+  public static String removePara(String s)
+  {
+    return remove(s,"(",")");
+  }
+  
+  /**
+   * Removes ( and ) from the beginning and end of all tokens
+   * @return String without the ( or )
+   */
+  public void removePara()
+  {
+    remove("(",")");
+  }
+  
+  /**
+   * Removes [ and ] from the beginning and end of a string
+   * @param s String to remove from
+   * @return String without the [ or ]
+   */
+  public static String removeBox(String s)
+  {
+    return remove(s,"[","]");
+  }
+  
+  /**
+   * Removes [ and ] from the beginning and end of all tokens
+   * @return String without the [ or ]
+   */
+  public void removeBox()
+  {
+    remove("[","]");
+  }
+  
+  /**
+   * Removes &lt; and &gt; from the beginning and end of a string
+   * @param s String to remove from
+   * @return String without the &lt; or &gt;
+   */
+  public static String removeAngle(String s)
+  {
+    return remove(s,"<",">");
+  }
+  
+  /**
+   * Removes &lt; and &gt; from the beginning and end of all tokens
+   * @return String without the &lt; or &gt;
+   */
+  public void removeAngle()
+  {
+    remove("<",">");
+  }
+}
-- 
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