ANTLR v4中mysql语法文件中的语法错误

Question

我正在使用来自ANTLR v4 repo 这里的Lexer和Parser来解析java中的mysql。但是，我在以下几行的MySqlLexer.g4可用这里文件中遇到了一个错误：

lexer grammar MySqlLexer;

channels { MYSQLCOMMENT, ERRORCHANNEL }

// SKIP

SPACE:                               [ \t\r\n]+    -> channel(HIDDEN);
SPEC_MYSQL_COMMENT:                  '/*!' .+? '*/' -> channel(MYSQLCOMMENT);
COMMENT_INPUT:                       '/*' .*? '*/' -> channel(HIDDEN);
LINE_COMMENT:                        (
                                   ('-- ' | '#') ~[\r\n]* ('\r'? '\n' | EOF) 
                                   | '--' ('\r'? '\n' | EOF) 
                                 ) -> channel(HIDDEN);  

第一个错误：

语法错误：“{ MYSQLCOMMENT，ERRORCHANNEL }”在匹配规则序言时给我一个完全的惊喜

第二个错误：(在“空格：”行)

语法错误：“(”在匹配规则序言时，我完全感到惊讶“) 语法错误:外来输入‘)在匹配规则时期望半个

下面是我的pom.xml，用于检查我正在使用的版本：

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>autoGem</groupId>
  <artifactId>autoGem</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>autoGem</name>
  <url>http://maven.apache.org</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <antlr4.visitor>true</antlr4.visitor>
    <antlr4.listener>true</antlr4.listener>
    <target.jvm>1.6</target.jvm>
    <antlr.version>4.7.1</antlr.version>
    <antlr4test-maven-plugin.version>1.10</antlr4test-maven-plugin.version>
  </properties>

  <dependencies>
  <dependency>
      <groupId>org.antlr</groupId>
      <artifactId>antlr4-runtime</artifactId>
      <version>${antlr.version}</version>
      <type>jar</type>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
  </dependencies>

  <build>
    <plugins>
    <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.0</version>
        <configuration>
          <source>${target.jvm}</source>
          <target>${target.jvm}</target>
          <showWarnings>true</showWarnings>
          <showDeprecation>true</showDeprecation>
          <compilerArguments>
            <Xlint />
          </compilerArguments>
        </configuration>
      </plugin>
      <plugin>
        <groupId>org.codehaus.mojo</groupId>
        <artifactId>build-helper-maven-plugin</artifactId>
        <version>1.7</version>
        <executions>
          <execution>
            <phase>generate-sources</phase>
            <goals>
              <goal>add-source</goal>
            </goals>
            <configuration>
              <sources>
                <source>target/generated-sources/antlr4</source>
              </sources>
            </configuration>
          </execution>
        </executions>
      </plugin>
      <plugin>
        <groupId>org.antlr</groupId>
        <artifactId>antlr4-maven-plugin</artifactId>
        <version>4.3</version>
        <configuration>
            <includes>
                <include>MySqlLexer.g4</include>
                <include>MySqlParser.g4</include>
            </includes>
            <visitor>true</visitor>
            <listener>true</listener>
        </configuration>
        <executions>
          <execution>
            <id>antlr4</id>
            <goals>
              <goal>antlr4</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
    </plugins>
    <pluginManagement>
      <plugins>
        <!--This plugin's configuration is used to store Eclipse m2e settings 
          only. It has no influence on the Maven build itself. -->
        <plugin>
          <groupId>org.eclipse.m2e</groupId>
          <artifactId>lifecycle-mapping</artifactId>
          <version>1.0.0</version>
          <configuration>
            <lifecycleMappingMetadata>
              <pluginExecutions>
                <pluginExecution>
                  <pluginExecutionFilter>
                    <groupId>org.antlr</groupId>
                    <artifactId>antlr4-maven-plugin</artifactId>
                    <versionRange>[4.0,)</versionRange>
                    <goals>
                      <goal>antlr4</goal>
                    </goals>
                  </pluginExecutionFilter>
                  <action>
                    <execute>
                      <runOnIncremental>true</runOnIncremental>
                    </execute>
                  </action>
                </pluginExecution>
              </pluginExecutions>
            </lifecycleMappingMetadata>
          </configuration>
        </plugin>
      </plugins>
    </pluginManagement>
  </build>
</project>

我对ANTLR语法非常陌生。请帮帮忙。

谢谢:)

Answer 1

我从终端下载了ANTLR4 JAR：

wget http://www.antlr.org/download/antlr-4.7.1-complete.jar

并下载了语法：

wget https://raw.githubusercontent.com/antlr/grammars-v4/master/mysql/MySqlLexer.g4
wget https://raw.githubusercontent.com/antlr/grammars-v4/master/mysql/MySqlParser.g4

然后从这些语法中生成lexer和解析器：

java -cp antlr-4.7.1-complete.jar org.antlr.v4.Tool MySqlLexer.g4
java -cp antlr-4.7.1-complete.jar org.antlr.v4.Tool MySqlParser.g4

换句话说，它工作得很好。你一定做错什么了。我猜您正在使用ANTLR3 Tool来生成lexer和解析器。

编辑

把这个从你的pom.xml中删除

<plugin>
  <groupId>org.antlr</groupId>
  <artifactId>antlr4-maven-plugin</artifactId>
  <version>4.3</version>
  <configuration>
    <includes>
      <include>MySqlLexer.g4</include>
      <include>MySqlParser.g4</include>
    </includes>
    <visitor>true</visitor>
    <listener>true</listener>
  </configuration>
  <executions>
    <execution>
      <id>antlr4</id>
      <goals>
        <goal>antlr4</goal>
      </goals>
    </execution>
  </executions>
</plugin>

并将其替换为：

<plugin>
  <groupId>org.antlr</groupId>
  <artifactId>antlr4-maven-plugin</artifactId>
  <version>${antlr.version}</version>
  <configuration>
    <arguments>
      <argument>-visitor</argument>
    </arguments>
  </configuration>
  <executions>
    <execution>
      <goals>
        <goal>antlr4</goal>
      </goals>
    </execution>
  </executions>
</plugin>

我已经测试过了，而且效果很好。