Working on parser source code. Main statements implemented. WIP

pom.xml

@@ -117,6 +117,10 @@
                         </goals>
                     </execution>
                 </executions>
+                <configuration>
+                    <listener>false</listener>
+                    <visitor>true</visitor>
+                </configuration>
             </plugin>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>

src/main/antlr4/io/github/willena/influxql/parser/InfluxqlLexer.g4

@@ -0,0 +1,146 @@
+lexer grammar InfluxqlLexer;
+
+options {
+    caseInsensitive = true;
+}
+
+QUOTE: '"';
+SCOL : ';';
+DOT : '.';
+OPEN_PAR : '(';
+CLOSE_PAR : ')';
+COMMA : ',';
+ASSIGN : '=';
+STAR : '*';
+PLUS : '+';
+MINUS : '-';
+TILDE : '~';
+SLASH : '/';
+MOD : '%';
+LT2 : '<<';
+GT2 : '>>';
+AMP : '&';
+LT : '<';
+LT_EQ : '<=';
+GT : '>';
+GT_EQ : '>=';
+EQ : '==';
+NOT_EQ1 : '!=';
+NOT_EQ2 : '<>';
+REG_MATCH: '=~';
+OR_EX: '^';
+PIPE: '|';
+PIPE2: '||';
+START_TAGS: STAR '::tag';
+START_FIELD: STAR '::field';
+
+// Keywords
+AND: 'AND';
+OR: 'OR';
+ALL: 'ALL';
+ALTER: 'ALTER';
+ANALYZE: 'ANALYZE';
+ANY: 'ANY';
+AS: 'AS';
+ASC: 'ASC';
+BEGIN: 'BEGIN';
+BY: 'BY';
+CREATE: 'CREATE';
+CONTINUOUS: 'CONTINUOUS';
+DATABASE: 'DATABASE';
+DATABASES: 'DATABASES';
+DEFAULT: 'DEFAULT';
+DELETE: 'DELETE';
+DESC: 'DESC';
+DESTINATIONS: 'DESTINATIONS';
+DIAGNOSTICS: 'DIAGNOSTICS';
+DISTINCT: 'DISTINCT';
+DROP: 'DROP';
+DURATION: 'DURATION';
+END: 'END';
+EVERY: 'EVERY';
+EXPLAIN: 'EXPLAIN';
+FIELD: 'FIELD';
+FOR: 'FOR';
+FROM: 'FROM';
+GRANT: 'GRANT';
+GRANTS: 'GRANTS';
+GROUP: 'GROUP';
+GROUPS: 'GROUPS';
+IN: 'IN';
+INF: 'INF';
+INSERT: 'INSERT';
+INTO: 'INTO';
+KEY: 'KEY';
+KEYS: 'KEYS';
+KILL: 'KILL';
+LIMIT: 'LIMIT';
+SHOW: 'SHOW';
+MEASUREMENT: 'MEASUREMENT';
+MEASUREMENTS: 'MEASUREMENTS';
+NAME: 'NAME';
+OFFSET: 'OFFSET';
+ON: 'ON';
+ORDER: 'ORDER';
+PASSWORD: 'PASSWORD';
+POLICY: 'POLICY';
+POLICIES: 'POLICIES';
+PRIVILEGES: 'PRIVILEGES';
+QUERIES: 'QUERIES';
+QUERY: 'QUERY';
+READ: 'READ';
+REPLICATION: 'REPLICATION';
+RESAMPLE: 'RESAMPLE';
+RETENTION: 'RETENTION';
+REVOKE: 'REVOKE';
+SELECT: 'SELECT';
+SERIES: 'SERIES';
+SET: 'SET';
+SHARD: 'SHARD';
+SHARDS: 'SHARDS';
+SLIMIT: 'SLIMIT';
+SOFFSET: 'SOFFSET';
+STATS: 'STATS';
+SUBSCRIPTION: 'SUBSCRIPTION';
+SUBSCRIPTIONS: 'SUBSCRIPTIONS';
+TAG: 'TAG';
+TO: 'TO';
+USER: 'USER';
+USERS: 'USERS';
+VALUES: 'VALUES';
+WHERE: 'WHERE';
+WITH: 'WITH';
+WRITE: 'WRITE';
+CARDINALITY: 'CARDINALITY';
+EXACT: 'EXACT';
+
+FILL: 'FILL';
+NULL: 'NULL';
+NONE: 'NONE';
+PREVIOUS: 'PREVIOUS';
+LINEAR: 'LINEAR';
+TZ: 'TZ';
+TRUE: 'TRUE';
+FALSE: 'FALSE';
+MEASUREMENT_BACK_REF: '.:MEASUREMENT';
+
+IDENTIFIER:
+    '"' (~'"' | '""')* '"'
+    | '`' (~'`' | '``')* '`'
+    | [A-Z_\u007F-\uFFFF] [A-Z_0-9\u007F-\uFFFF]*
+    ;
+
+INTEGER_LITERAL: DIGIT+;
+NUMERIC_LITERAL: (DIGIT+ ('.' DIGIT*)? | '.' DIGIT+);
+STRING_LITERAL: '\'' ( ~'\'' | '\'\'')* '\'';
+
+DURATION_LITERAL: INTEGER_LITERAL ('ns' | 'u' | 'µ' | 'ms' | 's' | 'm' | 'h' | 'd' | 'w');
+
+REGULAR_EXPRESSION_LITERAL: '/' UNICODE_CHAR* '/';
+
+UNICODE_CHAR: ~[ \t\r\n];
+
+fragment DIGIT: [0-9];
+
+SPACES: [ \u000B\t\r\n] -> channel(HIDDEN);
+UNEXPECTED_CHAR: .;