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src/main/java/com/google/api/generator/engine/ast/LambdaExpr.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,115 @@ | ||
| // Copyright 2021 Google LLC | ||
| // | ||
| // 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.google.api.generator.engine.ast; | ||
|
|
||
| import com.google.auto.value.AutoValue; | ||
| import com.google.common.base.Preconditions; | ||
| import com.google.common.collect.ImmutableList; | ||
| import java.util.Arrays; | ||
| import java.util.Collections; | ||
| import java.util.List; | ||
| import java.util.Set; | ||
| import java.util.stream.Collectors; | ||
|
|
||
| @AutoValue | ||
| public abstract class LambdaExpr implements Expr { | ||
| @Override | ||
| public TypeNode type() { | ||
| // TODO(v2): Support set of FunctionalInterface parameterized on the args and return type, | ||
| // which would enable assignment to an appropriate variable. | ||
| return TypeNode.VOID; | ||
| } | ||
|
|
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| public abstract ImmutableList<VariableExpr> arguments(); | ||
|
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| public abstract ReturnExpr returnExpr(); | ||
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| public abstract ImmutableList<Statement> body(); | ||
|
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| @Override | ||
| public void accept(AstNodeVisitor visitor) { | ||
| visitor.visit(this); | ||
| } | ||
|
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| public static Builder builder() { | ||
| return new AutoValue_LambdaExpr.Builder() | ||
| .setArguments(Collections.emptyList()) | ||
| .setBody(Collections.emptyList()); | ||
| } | ||
|
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| @AutoValue.Builder | ||
| public abstract static class Builder { | ||
| public Builder setArguments(VariableExpr... arguments) { | ||
| return setArguments(Arrays.asList(arguments)); | ||
| } | ||
|
|
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| public abstract Builder setArguments(List<VariableExpr> arguments); | ||
|
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| public abstract Builder setBody(List<Statement> body); | ||
|
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| public abstract Builder setReturnExpr(ReturnExpr returnExpr); | ||
|
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| public Builder setReturnExpr(Expr expr) { | ||
| return setReturnExpr(ReturnExpr.builder().setExpr(expr).build()); | ||
| } | ||
|
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| public abstract LambdaExpr autoBuild(); | ||
|
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| public LambdaExpr build() { | ||
| LambdaExpr lambdaExpr = autoBuild(); | ||
| Preconditions.checkState( | ||
| !lambdaExpr.returnExpr().expr().type().equals(TypeNode.VOID), | ||
| "Lambdas cannot return void-typed expressions."); | ||
| // Must be a declaration. | ||
| lambdaExpr.arguments().stream() | ||
| .forEach( | ||
| varExpr -> | ||
| Preconditions.checkState( | ||
| varExpr.isDecl(), | ||
| String.format( | ||
| "Argument %s must be a variable declaration", | ||
| varExpr.variable().identifier()))); | ||
| // No modifiers allowed. | ||
| lambdaExpr.arguments().stream() | ||
| .forEach( | ||
| varExpr -> | ||
| Preconditions.checkState( | ||
| varExpr.scope().equals(ScopeNode.LOCAL) | ||
| && !varExpr.isStatic() | ||
| && !varExpr.isFinal() | ||
| && !varExpr.isVolatile(), | ||
| String.format( | ||
| "Argument %s must have local scope, and cannot have static, final, or" | ||
| + " volatile modifiers", | ||
| varExpr.variable().identifier()))); | ||
|
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| // Check that there aren't any arguments with duplicate names. | ||
| List<String> allArgNames = | ||
| lambdaExpr.arguments().stream() | ||
| .map(v -> v.variable().identifier().name()) | ||
| .collect(Collectors.toList()); | ||
| Set<String> duplicateArgNames = | ||
| allArgNames.stream() | ||
| .filter(n -> Collections.frequency(allArgNames, n) > 1) | ||
| .collect(Collectors.toSet()); | ||
| Preconditions.checkState( | ||
| duplicateArgNames.isEmpty(), | ||
| String.format( | ||
| "Lambda arguments cannot have duplicate names: %s", duplicateArgNames.toString())); | ||
|
|
||
| return lambdaExpr; | ||
| } | ||
| } | ||
| } |
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