diff options
Diffstat (limited to 'JPratt/src/main/java/bjc/pratt/blocks/RepeatingParseBlock.java')
| -rw-r--r-- | JPratt/src/main/java/bjc/pratt/blocks/RepeatingParseBlock.java | 100 |
1 files changed, 0 insertions, 100 deletions
diff --git a/JPratt/src/main/java/bjc/pratt/blocks/RepeatingParseBlock.java b/JPratt/src/main/java/bjc/pratt/blocks/RepeatingParseBlock.java deleted file mode 100644 index 722e395..0000000 --- a/JPratt/src/main/java/bjc/pratt/blocks/RepeatingParseBlock.java +++ /dev/null @@ -1,100 +0,0 @@ -package bjc.pratt.blocks; - -import java.util.function.UnaryOperator; - -import bjc.pratt.ParserContext; -import bjc.pratt.commands.CommandResult; -import bjc.pratt.commands.CommandResult.Status; -import bjc.pratt.tokens.Token; -import bjc.data.Tree; -import bjc.data.SimpleTree; -import bjc.utils.parserutils.ParserException; - -/** - * A parse block that can parse a sequnce of zero or more occurances of another - * block. - * - * @author bjculkin - * - * @param <K> - * The key type of the tokens. - * - * @param <V> - * The value type of the tokens. - * - * @param <C> - * The state type of the parser. - */ -public class RepeatingParseBlock<K, V, C> implements ParseBlock<K, V, C> { - private final ParseBlock<K, V, C> innerBlock; - - private final K delim; - private final K term; - - private final UnaryOperator<C> onDelim; - - private final Token<K, V> mark; - - /** - * Create a new repeating block. - * - * @param inner - * The inner block for elements. - * - * @param delimiter - * The token that delimits elements in the sequence. - * - * @param terminator - * The token that terminates the sequence. - * - * @param marker - * The token to use as the node in the AST. - * - * @param action - * The action to apply to the state after every delimiter. - */ - public RepeatingParseBlock(final ParseBlock<K, V, C> inner, final K delimiter, final K terminator, - final Token<K, V> marker, final UnaryOperator<C> action) { - super(); - - if(inner == null) - throw new NullPointerException("Inner block must not be null"); - else if(delimiter == null) - throw new NullPointerException("Delimiter must not be null"); - else if(terminator == null) throw new NullPointerException("Terminator must not be null"); - - innerBlock = inner; - - delim = delimiter; - term = terminator; - - mark = marker; - - onDelim = action; - } - - @Override - public CommandResult<K, V> parse(final ParserContext<K, V, C> ctx) throws ParserException { - final Tree<Token<K, V>> ret = new SimpleTree<>(mark); - - Token<K, V> tok = ctx.tokens.current(); - - while(!tok.getKey().equals(term)) { - final CommandResult<K,V> resKid = innerBlock.parse(ctx); - if (resKid.status != Status.SUCCESS) return resKid; - Tree<Token<K, V>> kid = resKid.success(); - ret.addChild(kid); - - tok = ctx.tokens.current(); - - ctx.tokens.expect(delim, term); - - if(onDelim != null) { - ctx.state = onDelim.apply(ctx.state); - } - } - - return CommandResult.success(ret); - } - -} |
