diff options
Diffstat (limited to 'JPratt/src/main/java/bjc/pratt/TokenStream.java')
| -rw-r--r-- | JPratt/src/main/java/bjc/pratt/TokenStream.java | 104 |
1 files changed, 0 insertions, 104 deletions
diff --git a/JPratt/src/main/java/bjc/pratt/TokenStream.java b/JPratt/src/main/java/bjc/pratt/TokenStream.java deleted file mode 100644 index 7390e5f..0000000 --- a/JPratt/src/main/java/bjc/pratt/TokenStream.java +++ /dev/null @@ -1,104 +0,0 @@ -package bjc.pratt; - -import java.util.Arrays; -import java.util.HashSet; -import java.util.Iterator; -import java.util.Set; - -import bjc.utils.funcutils.StringUtils; -import bjc.utils.parserutils.ParserException; - -/** - * A stream of tokens. - * - * @author EVE - * - * @param <K> - * The key type of the token. - * - * @param <V> - * The value type of the token. - */ -public abstract class TokenStream<K, V> implements Iterator<Token<K, V>> { - /** - * The exception thrown when an expectation fails. - * - * @author EVE - * - */ - public static class ExpectationException extends ParserException { - private static final long serialVersionUID = 4299299480127680805L; - - /** - * Create a new exception with the specified message. - * - * @param msg - * The message of the exception. - */ - public ExpectationException(final String msg) { - super(msg); - } - } - - /** - * Get the current token. - * - * @return The current token. - */ - public abstract Token<K, V> current(); - - @Override - public abstract Token<K, V> next(); - - @Override - public abstract boolean hasNext(); - - /** - * Utility method for checking that the next token is one of a specific - * set of types, and then consuming it. - * - * @param expectedKeys - * The expected values - * - * @throws ExpectationException - * If the token is not one of the expected types. - */ - public void expect(final Set<K> expectedKeys) throws ExpectationException { - final K curKey = current().getKey(); - - if (!expectedKeys.contains(curKey)) { - final String expectedList = StringUtils.toEnglishList(expectedKeys.toArray(), false); - - throw new ExpectationException("One of '" + expectedList + "' was expected, not " + curKey); - } - - next(); - } - - /** - * Utility method for checking that the next token is one of a specific - * set of types, and then consuming it. - * - * @param expectedKeys - * The expected values - * - * @throws ExpectationException - * If the token is not one of the expected types. - */ - @SafeVarargs - public final void expect(final K... expectedKeys) throws ExpectationException { - expect(new HashSet<>(Arrays.asList(expectedKeys))); - } - - /** - * Check whether the head token is a certain type. - * - * @param val - * The type to check for. - * - * @return Whether or not the head token is of that type. - */ - public boolean headIs(final K val) { - return current().getKey().equals(val); - } -} |
