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Adds STR_LEFT and STR_RIGHT functions (#503)
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64 changes: 64 additions & 0 deletions
64
src/main/java/com/ezylang/evalex/functions/string/StringLeftFunction.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,64 @@ | ||
| /* | ||
| Copyright 2012-2024 Udo Klimaschewski | ||
| 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. | ||
| */ | ||
| package com.ezylang.evalex.functions.string; | ||
|
|
||
| import com.ezylang.evalex.Expression; | ||
| import com.ezylang.evalex.data.EvaluationValue; | ||
| import com.ezylang.evalex.functions.AbstractFunction; | ||
| import com.ezylang.evalex.functions.FunctionParameter; | ||
| import com.ezylang.evalex.parser.Token; | ||
|
|
||
| /** | ||
| * Represents a function that extracts a substring from the left side of a given string. This class | ||
| * extends the {@link AbstractFunction} and implements the logic for the `LEFT` string function, | ||
| * which returns a specified number of characters from the beginning (left) of the input string. | ||
| * | ||
| * <p>Two parameters are required for this function: | ||
| * | ||
| * <ul> | ||
| * <li><b>string</b> - The input string from which the substring will be extracted. | ||
| * <li><b>length</b> - The number of characters to extract from the left side of the string. If | ||
| * the specified length is greater than the string's length, the entire string is returned. If | ||
| * the length is negative or zero, an empty string is returned. | ||
| * </ul> | ||
| * | ||
| * <p>Example usage: If the input string is "hello" and the length is 2, the result will be "he". | ||
| */ | ||
| @FunctionParameter(name = "string") | ||
| @FunctionParameter(name = "length") | ||
| public class StringLeftFunction extends AbstractFunction { | ||
|
|
||
| /** | ||
| * Evaluates the `LEFT` string function by extracting a substring from the left side of the given | ||
| * string. | ||
| * | ||
| * @param expression the current expression being evaluated | ||
| * @param functionToken the token representing the function being called | ||
| * @param parameterValues the parameters passed to the function; expects exactly two parameters: a | ||
| * string and a numeric value for length | ||
| * @return the substring extracted from the left side of the input string as an {@link | ||
| * EvaluationValue} | ||
| */ | ||
| @Override | ||
| public EvaluationValue evaluate( | ||
| Expression expression, Token functionToken, EvaluationValue... parameterValues) { | ||
| String string = parameterValues[0].getStringValue(); | ||
| int length = | ||
| Math.max(0, Math.min(parameterValues[1].getNumberValue().intValue(), string.length())); | ||
| String substr = string.substring(0, length); | ||
| return expression.convertValue(substr); | ||
| } | ||
| } |
64 changes: 64 additions & 0 deletions
64
src/main/java/com/ezylang/evalex/functions/string/StringRightFunction.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,64 @@ | ||
| /* | ||
| Copyright 2012-2024 Udo Klimaschewski | ||
| 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. | ||
| */ | ||
| package com.ezylang.evalex.functions.string; | ||
|
|
||
| import com.ezylang.evalex.Expression; | ||
| import com.ezylang.evalex.data.EvaluationValue; | ||
| import com.ezylang.evalex.functions.AbstractFunction; | ||
| import com.ezylang.evalex.functions.FunctionParameter; | ||
| import com.ezylang.evalex.parser.Token; | ||
|
|
||
| /** | ||
| * Represents a function that extracts a substring from the right side of a given string. This class | ||
| * extends the {@link AbstractFunction} and implements the logic for the `RIGHT` string function, | ||
| * which returns a specified number of characters from the end (right) of the input string. | ||
| * | ||
| * <p>Two parameters are required for this function: | ||
| * | ||
| * <ul> | ||
| * <li><b>string</b> - The input string from which the substring will be extracted. | ||
| * <li><b>length</b> - The number of characters to extract from the right side of the string. If | ||
| * the specified length is greater than the string's length, the entire string is returned. If | ||
| * the length is negative or zero, an empty string is returned. | ||
| * </ul> | ||
| * | ||
| * <p>Example usage: If the input string is "hello" and the length is 2, the result will be "lo". | ||
| */ | ||
| @FunctionParameter(name = "string") | ||
| @FunctionParameter(name = "length") | ||
| public class StringRightFunction extends AbstractFunction { | ||
|
|
||
| /** | ||
| * Evaluates the `RIGHT` string function by extracting a substring from the right side of the | ||
| * given string. | ||
| * | ||
| * @param expression the current expression being evaluated | ||
| * @param functionToken the token representing the function being called | ||
| * @param parameterValues the parameters passed to the function; expects exactly two parameters: a | ||
| * string and a numeric value for length | ||
| * @return the substring extracted from the right side of the input string as an {@link | ||
| * EvaluationValue} | ||
| */ | ||
| @Override | ||
| public EvaluationValue evaluate( | ||
| Expression expression, Token functionToken, EvaluationValue... parameterValues) { | ||
| String string = parameterValues[0].getStringValue(); | ||
| int length = | ||
| Math.max(0, Math.min(parameterValues[1].getNumberValue().intValue(), string.length())); | ||
| String substr = string.substring(string.length() - length); | ||
| return expression.convertValue(substr); | ||
| } | ||
| } |
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