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[operators]feat: add final keyword check on assignment expr #366

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Merged
merged 4 commits into from
Oct 6, 2020
Merged

[operators]feat: add final keyword check on assignment expr #366

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7ef2585
fix: add final keyword check on assignment expr
summer-ji-eng Oct 4, 2020
975d59e
Merge branch 'master' into fix_assignment_expr
summer-ji-eng Oct 5, 2020
fd4cf71
Merge branch 'master' into fix_assignment_expr
summer-ji-eng Oct 6, 2020
8305e9b
Merge branch 'master' into fix_assignment_expr
summer-ji-eng Oct 6, 2020
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10 changes: 10 additions & 0 deletions src/main/java/com/google/api/generator/engine/ast/AssignmentExpr.java
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,7 @@
package com.google.api.generator.engine.ast;

import com.google.auto.value.AutoValue;
import com.google.common.base.Preconditions;

@AutoValue
public abstract class AssignmentExpr implements Expr {
Expand Down Expand Up @@ -67,6 +68,15 @@ public AssignmentExpr build() {
lhsType.reference().name(), rhsType.reference().name()));
}
}

if (!assignmentExpr.variableExpr().isDecl()) {
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What if the decl is final too? That is, I think we can remove the outer check.

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Never mind, that would apply only on the general for statement.

Preconditions.checkState(
!assignmentExpr.variableExpr().isFinal(),
String.format(
"Cannot assign a value to final variable '%s'.",
assignmentExpr.variableExpr().variable().name()));
}

return assignmentExpr;
}
}
Expand Down
26 changes: 26 additions & 0 deletions src/test/java/com/google/api/generator/engine/ast/AssignmentExprTest.java
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Expand Up @@ -137,6 +137,32 @@ public void writeAssignmentExpr_invalidBoxedPrimitiveType() {
assertInvalidAssignmentExpr(lVariableExpr, rVariableExpr);
}

@Test
public void writeAssignmentExpr_validIsDeclFinalVariableExpr() {
Variable lVariable = Variable.builder().setName("x").setType(TypeNode.INT).build();
VariableExpr lVariableExpr =
VariableExpr.builder().setVariable(lVariable).setIsDecl(true).setIsFinal(true).build();

ValueExpr valueExpr =
ValueExpr.withValue(PrimitiveValue.builder().setType(TypeNode.INT).setValue("0").build());
assertValidAssignmentExpr(lVariableExpr, valueExpr);
}

@Test
public void writeAssignmentExpr_invalidIsNotDeclFinalVariableExpr() {
Variable lVariable = Variable.builder().setName("x").setType(TypeNode.INT).build();
VariableExpr lVariableExpr =
VariableExpr.builder().setVariable(lVariable).setIsDecl(false).setIsFinal(true).build();

ValueExpr valueExpr =
ValueExpr.withValue(PrimitiveValue.builder().setType(TypeNode.INT).setValue("0").build());
assertThrows(
IllegalStateException.class,
() -> {
AssignmentExpr.builder().setVariableExpr(lVariableExpr).setValueExpr(valueExpr).build();
});
}

private static void assertInvalidAssignmentExpr(VariableExpr variableExpr, Expr valueExpr) {
assertThrows(
TypeMismatchException.class,
Expand Down