diff options
Diffstat (limited to 'JPratt/src/main/java/bjc/pratt/commands/impls/InitialCommands.java')
| -rw-r--r-- | JPratt/src/main/java/bjc/pratt/commands/impls/InitialCommands.java | 29 |
1 files changed, 28 insertions, 1 deletions
diff --git a/JPratt/src/main/java/bjc/pratt/commands/impls/InitialCommands.java b/JPratt/src/main/java/bjc/pratt/commands/impls/InitialCommands.java index bfc4e4f..6af6954 100644 --- a/JPratt/src/main/java/bjc/pratt/commands/impls/InitialCommands.java +++ b/JPratt/src/main/java/bjc/pratt/commands/impls/InitialCommands.java @@ -7,9 +7,10 @@ import static bjc.pratt.blocks.ParseBlocks.trigger; import java.util.function.UnaryOperator; import bjc.pratt.blocks.ParseBlock; -import bjc.pratt.commands.InitialCommand; +import bjc.pratt.commands.*; import bjc.pratt.tokens.Token; import bjc.data.Tree; +import bjc.functypes.MapBuilder; /** * * Contains factory methods for producing common implementations of @@ -211,4 +212,30 @@ public class InitialCommands { public static <K, V, C> InitialCommand<K, V, C> panfix(final int precedence, final K term, final Token<K, V> marker) { return new PanfixCommand<>(marker, term, precedence); } + + /** + * Create a command that unconditionally returns a failure result. + * + * @param <K> Token key type + * @param <V> Token value type + * @param <C> Context type + * + * @return A command that unconditionally fails + */ + public static <K, V, C> InitialCommand<K, V, C> fail() { + return (operator, ctx) -> CommandResult.fail(); + } + + /** + * Create a new builder for branching/sub-command style commands. + * + * @param <K> Token key type + * @param <V> Value key type + * @param <C> Context type + * + * @return A builder for branching/sub-command style commands + */ + public static <K, V, C> MapBuilder<K, InitialCommand<K, V, C>, InitialCommand<K, V, C>> branch() { + return MapBuilder.from(BranchInitialCommand::new); + } }
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