diff options
Diffstat (limited to 'BJC-Utils2/src/main/java/bjc/utils/parserutils/pratt/blocks')
| -rw-r--r-- | BJC-Utils2/src/main/java/bjc/utils/parserutils/pratt/blocks/ParseBlocks.java | 73 |
1 files changed, 72 insertions, 1 deletions
diff --git a/BJC-Utils2/src/main/java/bjc/utils/parserutils/pratt/blocks/ParseBlocks.java b/BJC-Utils2/src/main/java/bjc/utils/parserutils/pratt/blocks/ParseBlocks.java index 43163e6..9df8355 100644 --- a/BJC-Utils2/src/main/java/bjc/utils/parserutils/pratt/blocks/ParseBlocks.java +++ b/BJC-Utils2/src/main/java/bjc/utils/parserutils/pratt/blocks/ParseBlocks.java @@ -1,6 +1,11 @@ package bjc.utils.parserutils.pratt.blocks; +import java.util.function.Predicate; +import java.util.function.UnaryOperator; + +import bjc.utils.data.ITree; import bjc.utils.parserutils.pratt.ParseBlock; +import bjc.utils.parserutils.pratt.Token; /** * Utility class for creating common implementations of {@link ParseBlock} @@ -9,5 +14,71 @@ import bjc.utils.parserutils.pratt.ParseBlock; * */ public class ParseBlocks { + /** + * Create a new repeating parse block. + * + * @param inner + * The parse block to repeat. + * + * @param delim + * The token type that seperates repetitions. + * + * @param term + * The token type that terminates repititions. + * + * @param mark + * The token to use as the node in the AST. + * + * @param action + * The action to perform on the state after every + * repitition. + * + * @return A configured repeating parse block. + */ + public static <K, V, C> ParseBlock<K, V, C> repeating(ParseBlock<K, V, C> inner, K delim, K term, + Token<K, V> mark, UnaryOperator<C> action) { + return new RepeatingParseBlock<>(inner, delim, term, mark, action); + } + + /** + * Create a new triggered parse block. + * + * @param source + * The block to trigger around. + * + * @param onEnter + * The action to perform upon the state before entering + * the block. + * + * @param onExit + * The action to perform upon the state after exiting the + * block. + * + * @return A configured trigger parse block. + */ + public static <K, V, C> ParseBlock<K, V, C> trigger(ParseBlock<K, V, C> source, UnaryOperator<C> onEnter, + UnaryOperator<C> onExit) { + return new TriggeredParseBlock<>(onEnter, onExit, source); + } -} + /** + * Create a new simple parse block. + * + * @param precedence + * The precedence of the expression inside the block. + * + * @param terminator + * The key type of the token expected after this block, + * or null if none is expected. + * + * @param validator + * The predicate to use to validate parsed expressions, + * or null if none is used. + * + * @return A configured simple parse block. + */ + public static <K, V, C> ParseBlock<K, V, C> simple(int precedence, K terminator, + Predicate<ITree<Token<K, V>>> validator) { + return new SimpleParseBlock<>(precedence, terminator, validator); + } +}
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