| // Copyright 2014 The Bazel Authors. All rights reserved. |
| // |
| // 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.devtools.build.lib.syntax; |
| |
| import com.google.common.collect.ImmutableList; |
| import java.util.List; |
| import javax.annotation.Nullable; |
| |
| /** Syntax node for an if or elif statement. */ |
| public final class IfStatement extends Statement { |
| |
| private final TokenKind token; // IF or ELIF |
| private final int ifOffset; |
| private final Expression condition; |
| // These blocks may be non-null but empty after a misparse: |
| private final ImmutableList<Statement> thenBlock; // non-empty |
| @Nullable ImmutableList<Statement> elseBlock; // non-empty if non-null; set after construction |
| |
| IfStatement( |
| FileLocations locs, |
| TokenKind token, |
| int ifOffset, |
| Expression condition, |
| List<Statement> thenBlock) { |
| super(locs); |
| this.token = token; |
| this.ifOffset = ifOffset; |
| this.condition = condition; |
| this.thenBlock = ImmutableList.copyOf(thenBlock); |
| } |
| |
| /** |
| * Reports whether this is an 'elif' statement. |
| * |
| * <p>An elif statement may appear only as the sole statement in the "else" block of another |
| * IfStatement. |
| */ |
| public boolean isElif() { |
| return token == TokenKind.ELIF; |
| } |
| |
| public Expression getCondition() { |
| return condition; |
| } |
| |
| public ImmutableList<Statement> getThenBlock() { |
| return thenBlock; |
| } |
| |
| @Nullable |
| public ImmutableList<Statement> getElseBlock() { |
| return elseBlock; |
| } |
| |
| void setElseBlock(ImmutableList<Statement> elseBlock) { |
| this.elseBlock = elseBlock; |
| } |
| |
| @Override |
| public int getStartOffset() { |
| return ifOffset; |
| } |
| |
| @Override |
| public int getEndOffset() { |
| List<Statement> body = elseBlock != null ? elseBlock : thenBlock; |
| return body.isEmpty() |
| ? condition.getEndOffset() // wrong, but tree is ill formed |
| : body.get(body.size() - 1).getEndOffset(); |
| } |
| |
| @Override |
| public String toString() { |
| return String.format("if %s: ...\n", condition); |
| } |
| |
| @Override |
| public void accept(NodeVisitor visitor) { |
| visitor.visit(this); |
| } |
| |
| @Override |
| public Kind kind() { |
| return Kind.IF; |
| } |
| } |