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Provide example for SpEL's exponential power operator (^)

This commit is contained in:
Sam Brannen 2024-01-28 15:46:00 +01:00
parent e34ad6bf5f
commit 24d6565cad
3 changed files with 46 additions and 24 deletions
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30
framework-docs/modules/ROOT/pages/core/expressions/language-ref/operators.adoc
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@ -290,30 +290,33 @@ Java::
[source,java,indent=0,subs="verbatim,quotes",role="primary"]
----
// Addition
int two = parser.parseExpression("1 + 1").getValue(Integer.class); // 2
int two = parser.parseExpression("1 + 1").getValue(int.class); // 2
// Subtraction
int four = parser.parseExpression("1 - -3").getValue(Integer.class); // 4
int four = parser.parseExpression("1 - -3").getValue(int.class); // 4
double d = parser.parseExpression("1000.00 - 1e4").getValue(Double.class); // -9000
double d = parser.parseExpression("1000.00 - 1e4").getValue(double.class); // -9000
// Multiplication
int six = parser.parseExpression("-2 * -3").getValue(Integer.class); // 6
int six = parser.parseExpression("-2 * -3").getValue(int.class); // 6
double twentyFour = parser.parseExpression("2.0 * 3e0 * 4").getValue(Double.class); // 24.0
double twentyFour = parser.parseExpression("2.0 * 3e0 * 4").getValue(double.class); // 24.0
// Division
int minusTwo = parser.parseExpression("6 / -3").getValue(Integer.class); // -2
int minusTwo = parser.parseExpression("6 / -3").getValue(int.class); // -2
double one = parser.parseExpression("8.0 / 4e0 / 2").getValue(Double.class); // 1.0
double one = parser.parseExpression("8.0 / 4e0 / 2").getValue(double.class); // 1.0
// Modulus
int three = parser.parseExpression("7 % 4").getValue(Integer.class); // 3
int three = parser.parseExpression("7 % 4").getValue(int.class); // 3
int one = parser.parseExpression("8 / 5 % 2").getValue(Integer.class); // 1
int one = parser.parseExpression("8 / 5 % 2").getValue(int.class); // 1
// Exponential power
int maxInt = parser.parseExpression("(2^31) - 1").getValue(int.class); // Integer.MAX_VALUE
// Operator precedence
int minusTwentyOne = parser.parseExpression("1+2-3*8").getValue(Integer.class); // -21
int minusTwentyOne = parser.parseExpression("1+2-3*8").getValue(int.class); // -21
----
Kotlin::
@ -343,7 +346,12 @@ Kotlin::
val one = parser.parseExpression("8 / 5 % 2").getValue(Int::class.java) // 1
// Operator precedence
// -- Exponential power --
var maxInt = parser.parseExpression("(2^31) - 1").getValue(Int::class.java) // Integer.MAX_VALUE
// -- Operator precedence --
val minusTwentyOne = parser.parseExpression("1+2-3*8").getValue(Int::class.java) // -21
----
======

9
spring-expression/src/test/java/org/springframework/expression/spel/ParsingTests.java
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@ -392,6 +392,15 @@ class ParsingTests {
parseCheck("7--", "7--");
parseCheck("foo--", "foo--");
}
@Test
void mathOperatorPower() {
parseCheck("3^2", "(3 ^ 2)");
parseCheck("3.0d^2.0d", "(3.0 ^ 2.0)");
parseCheck("3L^2L", "(3 ^ 2)");
parseCheck("(2^32)^2", "((2 ^ 32) ^ 2)");
parseCheck("new java.math.BigDecimal('5') ^ 3", "(new java.math.BigDecimal('5') ^ 3)");
}
}
@Nested

31
spring-expression/src/test/java/org/springframework/expression/spel/SpelDocumentationTests.java
View File

@ -73,17 +73,17 @@ class SpelDocumentationTests extends AbstractExpressionTests {
@Test
void methodInvocation() {
evaluate("'Hello World'.concat('!')","Hello World!",String.class);
evaluate("'Hello World'.concat('!')", "Hello World!", String.class);
}
@Test
void beanPropertyAccess() {
evaluate("new String('Hello World'.bytes)","Hello World",String.class);
evaluate("new String('Hello World'.bytes)", "Hello World", String.class);
}
@Test
void arrayLengthAccess() {
evaluate("'Hello World'.bytes.length",11,Integer.class);
evaluate("'Hello World'.bytes.length", 11, Integer.class);
}
@Test
@ -307,39 +307,44 @@ class SpelDocumentationTests extends AbstractExpressionTests {
@Test
void mathematicalOperators() {
// Addition
int two = parser.parseExpression("1 + 1").getValue(Integer.class); // 2
int two = parser.parseExpression("1 + 1").getValue(int.class); // 2
assertThat(two).isEqualTo(2);
// Subtraction
int four = parser.parseExpression("1 - -3").getValue(Integer.class); // 4
int four = parser.parseExpression("1 - -3").getValue(int.class); // 4
assertThat(four).isEqualTo(4);
double d = parser.parseExpression("1000.00 - 1e4").getValue(Double.class); // -9000
double d = parser.parseExpression("1000.00 - 1e4").getValue(double.class); // -9000
assertThat(d).isCloseTo(-9000.0d, within((double) 0));
// Multiplication
int six = parser.parseExpression("-2 * -3").getValue(Integer.class); // 6
int six = parser.parseExpression("-2 * -3").getValue(int.class); // 6
assertThat(six).isEqualTo(6);
double twentyFour = parser.parseExpression("2.0 * 3e0 * 4").getValue(Double.class); // 24.0
double twentyFour = parser.parseExpression("2.0 * 3e0 * 4").getValue(double.class); // 24.0
assertThat(twentyFour).isCloseTo(24.0d, within((double) 0));
// Division
int minusTwo = parser.parseExpression("6 / -3").getValue(Integer.class); // -2
int minusTwo = parser.parseExpression("6 / -3").getValue(int.class); // -2
assertThat(minusTwo).isEqualTo(-2);
double one = parser.parseExpression("8.0 / 4e0 / 2").getValue(Double.class); // 1.0
double one = parser.parseExpression("8.0 / 4e0 / 2").getValue(double.class); // 1.0
assertThat(one).isCloseTo(1.0d, within((double) 0));
// Modulus
int three = parser.parseExpression("7 % 4").getValue(Integer.class); // 3
int three = parser.parseExpression("7 % 4").getValue(int.class); // 3
assertThat(three).isEqualTo(3);
int oneInt = parser.parseExpression("8 / 5 % 2").getValue(Integer.class); // 1
int oneInt = parser.parseExpression("8 / 5 % 2").getValue(int.class); // 1
assertThat(oneInt).isEqualTo(1);
// Exponential power
int maxInt = parser.parseExpression("(2^31) - 1").getValue(int.class); // Integer.MAX_VALUE
assertThat(maxInt).isEqualTo(Integer.MAX_VALUE);
// Operator precedence
int minusTwentyOne = parser.parseExpression("1+2-3*8").getValue(Integer.class); // -21
int minusTwentyOne = parser.parseExpression("1+2-3*8").getValue(int.class); // -21
assertThat(minusTwentyOne).isEqualTo(-21);
}