X-Git-Url: http://www2.svjatoslav.eu/gitweb/?a=blobdiff_plain;f=src%2Fmain%2Fjava%2Feu%2Fsvjatoslav%2Fcommons%2Fstring%2Ftokenizer%2FTokenizer.java;h=939ede9dc5a8a7ecfe687745261254ba3b9b235b;hb=3bc3db3ceb288b82e48c349bf27dfafda2bcd444;hp=c4ca4d2e8dcd01e2b3a3218ea23224b1aa47ce47;hpb=2082c4e93c58ae61eac0bdf7955e8996f6a19768;p=svjatoslav_commons.git

diff --git a/src/main/java/eu/svjatoslav/commons/string/tokenizer/Tokenizer.java b/src/main/java/eu/svjatoslav/commons/string/tokenizer/Tokenizer.java
index c4ca4d2..939ede9 100755
--- a/src/main/java/eu/svjatoslav/commons/string/tokenizer/Tokenizer.java
+++ b/src/main/java/eu/svjatoslav/commons/string/tokenizer/Tokenizer.java
@@ -15,6 +15,7 @@ import java.util.Stack;
 import java.util.stream.Stream;
 
 import static eu.svjatoslav.commons.string.tokenizer.Terminator.TerminationStrategy.DROP;
+import static eu.svjatoslav.commons.string.tokenizer.Terminator.TerminationStrategy.PRESERVE;
 
 public class Tokenizer {
 
@@ -32,6 +33,7 @@ public class Tokenizer {
     public Tokenizer setSource(String source){
         this.source = source;
         currentIndex = 0;
+        tokenIndexes.clear();
         return this;
     }
 
@@ -55,49 +57,71 @@ public class Tokenizer {
                     + "\" but got \"" + match.token + "\" instead.");
     }
 
-    public TokenizerMatch getNextToken() {
+    public TokenizerMatch getNextToken() throws InvalidSyntaxException {
         tokenIndexes.push(currentIndex);
-        final StringBuilder result = new StringBuilder();
-
-        while (true) {
-            if (currentIndex >= source.length())
-                return null;
-
-            boolean accumulateCurrentChar = true;
-
-            for (final Terminator terminator : terminators)
-                if (sequenceMatches(terminator.startSequence))
-
-                    if (terminator.termination == DROP) {
-                        currentIndex += terminator.startSequence.length();
-
-                        if (terminator.endSequence != null)
-                            skipUntilSequence(terminator.endSequence);
-
-                        if (result.length() > 0)
-                            return new TokenizerMatch(result.toString(),
-                                    terminator);
-                        else {
-                            accumulateCurrentChar = false;
-                            break;
-                        }
-                    } else if (result.length() > 0)
-                        return new TokenizerMatch(result.toString(), terminator);
-                    else {
-                        currentIndex += terminator.startSequence.length();
-                        return new TokenizerMatch(terminator.startSequence,
-                                terminator);
-                    }
-
-            if (accumulateCurrentChar) {
-                result.append(source.charAt(currentIndex));
+
+        StringBuilder token = new StringBuilder();
+
+        while (true){
+            if (isOngoingToken()) {
+                token.append(source.charAt(currentIndex));
                 currentIndex++;
+                continue;
+            }
+
+            Terminator tokenTerminator = findTokenTerminator();
+
+            if (tokenTerminator.termination == PRESERVE){
+                return buildPreservedToken(token, tokenTerminator);
+            } else if (tokenTerminator.termination == DROP){
+                if (hasAccumulatedToken(token)){
+                    currentIndex++;
+                    return new TokenizerMatch(token.toString(), "", tokenTerminator);
+                } else {
+                    currentIndex++;
+                }
             }
         }
 
     }
 
-    public boolean consumeIfNextToken(final String token) {
+    private TokenizerMatch buildPreservedToken(StringBuilder token, Terminator terminator) throws InvalidSyntaxException {
+        if (hasAccumulatedToken(token))
+            return new TokenizerMatch(token.toString(), "", terminator);
+
+        if (terminator.hasEndSequence()){
+            int endSequenceIndex = source.indexOf(terminator.endSequence,
+                    currentIndex + terminator.startSequence.length());
+
+            if (endSequenceIndex < 0)
+                throw new InvalidSyntaxException("Expected \"" + terminator.endSequence + "\" but not found.");
+
+            String reminder = source.substring(currentIndex + terminator.startSequence.length(), endSequenceIndex);
+            currentIndex = endSequenceIndex + terminator.endSequence.length();
+
+            return new TokenizerMatch(terminator.startSequence, reminder, terminator);
+        } else {
+            currentIndex += terminator.startSequence.length();
+            return new TokenizerMatch(terminator.startSequence, "", terminator);
+        }
+    }
+
+    private boolean hasAccumulatedToken(StringBuilder token) {
+        return token.length() > 0;
+    }
+
+    private boolean isOngoingToken() {
+        return findTokenTerminator() == null;
+    }
+
+    public Terminator findTokenTerminator() {
+        for (Terminator terminator : terminators)
+            if (terminator.matches(source, currentIndex))
+                return terminator;
+        return null;
+    }
+
+    public boolean consumeIfNextToken(final String token) throws InvalidSyntaxException {
         if (token.equals(getNextToken().token))
             return true;
 
@@ -105,13 +129,13 @@ public class Tokenizer {
         return false;
     }
 
-    public TokenizerMatch peekNextToken(){
+    public TokenizerMatch peekNextToken() throws InvalidSyntaxException {
         TokenizerMatch result = getNextToken();
         unreadToken();
         return result;
     }
 
-    public boolean peekIsOneOf(String ... possibilities){
+    public boolean peekIsOneOf(String ... possibilities) throws InvalidSyntaxException {
         String nextToken = peekNextToken().token;
         return Stream.of(possibilities).anyMatch(possibility -> possibility.equals(nextToken));
     }