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78 changes: 78 additions & 0 deletions
78
src/main/java/com/github/curiousoddman/rgxgen/iterators/ValidatedIterator.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,78 @@ | ||
| package com.github.curiousoddman.rgxgen.iterators; | ||
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| import com.github.curiousoddman.rgxgen.validation.Validator; | ||
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| import java.util.List; | ||
| import java.util.NoSuchElementException; | ||
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| public class ValidatedIterator implements StringIterator { | ||
| private final List<Validator> aValidatorList; | ||
| private final StringIterator aStringIterator; | ||
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| private boolean isInitialized = false; | ||
| private String aCurrentValue = null; | ||
| private boolean hasNext = true; | ||
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| public ValidatedIterator(List<Validator> validatorList, StringIterator stringIterator) { | ||
| aValidatorList = validatorList; | ||
| aStringIterator = stringIterator; | ||
| } | ||
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| @Override | ||
| public void reset() { | ||
| isInitialized = false; | ||
| hasNext = true; | ||
| aCurrentValue = null; | ||
| aStringIterator.reset(); | ||
| } | ||
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| @Override | ||
| public String current() { | ||
| return aCurrentValue; | ||
| } | ||
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| private boolean findNextValid() { | ||
| while (aStringIterator.hasNext()) { | ||
| String next = aStringIterator.next(); | ||
| if (aValidatorList.stream() | ||
| .allMatch(v -> v.validate(next))) { | ||
| return true; | ||
| } | ||
| } | ||
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| return false; | ||
| } | ||
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| private void initialize() { | ||
| isInitialized = true; | ||
| boolean hasValid = findNextValid(); | ||
| if (hasValid) { | ||
| aCurrentValue = aStringIterator.current(); | ||
| hasNext = findNextValid(); | ||
| } | ||
| } | ||
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| @Override | ||
| public boolean hasNext() { | ||
| if (isInitialized) { | ||
| return hasNext; | ||
| } else { | ||
| initialize(); | ||
| return aCurrentValue != null; | ||
| } | ||
| } | ||
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| @Override | ||
| public String next() { | ||
| if (isInitialized) { | ||
| aCurrentValue = aStringIterator.current(); | ||
| hasNext = findNextValid(); | ||
| } else { | ||
| initialize(); | ||
| if (aCurrentValue == null) { | ||
| throw new NoSuchElementException("No texts can be produced by this pattern."); | ||
| } | ||
| } | ||
| return aCurrentValue; | ||
| } | ||
| } |
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32 changes: 32 additions & 0 deletions
32
src/main/java/com/github/curiousoddman/rgxgen/validation/Validator.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,32 @@ | ||
| package com.github.curiousoddman.rgxgen.validation; | ||
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| /* ************************************************************************** | ||
| Copyright 2019 Vladislavs Varslavans | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| /* **************************************************************************/ | ||
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| /** | ||
| * Validators are introduced to tackle lookaround generation. | ||
| * They check if the text (or part of it) matches lookahead or lookbehind patterns. | ||
| */ | ||
| public interface Validator { | ||
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| /** | ||
| * Checks if {@code text} is valid | ||
| * | ||
| * @param text text to check | ||
| * @return true if text is valid, false otherwise | ||
| */ | ||
| boolean validate(String text); | ||
| } |
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