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Code Issues Releases Wiki Activity

Remove the Pattern's dependency on java.util.function

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This commit is contained in:
Danila Fedorin 2017-09-24 00:12:25 -07:00
parent e82a13cde5
commit 0511c58b13
2 changed files with 19 additions and 4 deletions
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7
core/src/main/java/org/nwapw/abacus/lexing/pattern/Pattern.java
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@ -6,7 +6,6 @@ import java.util.Collection;
import java.util.HashMap; import java.util.HashMap;
import java.util.Map; import java.util.Map;
import java.util.Stack; import java.util.Stack;
import java.util.function.Function;
/** /**
* A pattern that can be compiled from a string and used in lexing. * A pattern that can be compiled from a string and used in lexing.
@ -36,8 +35,8 @@ public class Pattern<T> {
* A map of regex operator to functions that modify a PatternChain * A map of regex operator to functions that modify a PatternChain
* with the appropriate operation. * with the appropriate operation.
*/ */
private Map<Character, Function<PatternChain<T>, PatternChain<T>>> operations = private Map<Character, Transformation<T>> operations =
new HashMap<Character, Function<PatternChain<T>, PatternChain<T>>>() {{ new HashMap<Character, Transformation<T>>() {{
put('+', Pattern.this::transformPlus); put('+', Pattern.this::transformPlus);
put('*', Pattern.this::transformStar); put('*', Pattern.this::transformStar);
put('?', Pattern.this::transformQuestion); put('?', Pattern.this::transformQuestion);
@ -207,7 +206,7 @@ public class Pattern<T> {
if (operations.containsKey(currentChar)) { if (operations.containsKey(currentChar)) {
if (currentChain == null) return null; if (currentChain == null) return null;
currentChain = operations.get(currentChar).apply(currentChain); currentChain = operations.get(currentChar).transform(currentChain);
fullChain.append(currentChain); fullChain.append(currentChain);
currentChain = null; currentChain = null;
index++; index++;

16
core/src/main/java/org/nwapw/abacus/lexing/pattern/Transformation.java Normal file
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@ -0,0 +1,16 @@
package org.nwapw.abacus.lexing.pattern;
/**
* An interface that transforms a pattern chain into a different pattern chain.
* @param <T> the type used to identify the nodes in the pattern chain.
*/
public interface Transformation<T> {
/**
* Performs the actual transformation.
* @param from the original chain.
* @return the resulting chain.
*/
PatternChain<T> transform(PatternChain<T> from);
}