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lexer grammar SchemaLexer;
@header {
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
}
// data types
// https://drill.apache.org/docs/supported-data-types/
INT: 'INT';
INTEGER: 'INTEGER';
BIGINT: 'BIGINT';
FLOAT: 'FLOAT';
DOUBLE: 'DOUBLE';
DEC: 'DEC';
DECIMAL: 'DECIMAL';
NUMERIC: 'NUMERIC';
BOOLEAN: 'BOOLEAN';
CHAR: 'CHAR';
CHARACTER: 'CHARACTER';
VARYING: 'VARYING';
VARCHAR: 'VARCHAR';
BINARY: 'BINARY';
VARBINARY: 'VARBINARY';
TIME: 'TIME';
DATE: 'DATE';
TIMESTAMP: 'TIMESTAMP';
INTERVAL: 'INTERVAL';
YEAR: 'YEAR';
MONTH: 'MONTH';
DAY: 'DAY';
HOUR: 'HOUR';
MINUTE: 'MINUTE';
SECOND: 'SECOND';
MAP: 'MAP';
ARRAY: 'ARRAY';
// symbols
COMMA: ',';
REVERSE_QUOTE: '`';
LEFT_PAREN: '(';
RIGHT_PAREN: ')';
LEFT_ANGLE_BRACKET: '<';
RIGHT_ANGLE_BRACKET: '>';
SINGLE_QUOTE: '\'';
DOUBLE_QUOTE: '"';
LEFT_BRACE: '{';
RIGHT_BRACE: '}';
EQUALS_SIGN: '=';
NOT: 'NOT';
NULL: 'NULL';
AS: 'AS';
FORMAT: 'FORMAT';
DEFAULT: 'DEFAULT';
PROPERTIES: 'PROPERTIES';
NUMBER: [1-9] DIGIT* | '0';
fragment DIGIT: [0-9];
// identifiers
// column name can start with any letter, dollar sign ($) or underscore (_),
// consequently can contain any letter, dollar sign ($), underscore (_) or digit
// if any other symbols are present, use QUOTED_ID
ID: ([A-Z$_]) ([A-Z$_] | DIGIT)*;
// column name should be enclosed into backticks, can contain any symbols including space
// if contains backtick, it should be escaped with backslash (`a\\`b` -> a`b)
// if contains backslash, it should be escaped as well (`a\\\\b` -> a\b)
QUOTED_ID: REVERSE_QUOTE (~[`\\] | '\\' [`\\])* REVERSE_QUOTE;
SINGLE_QUOTED_STRING: SINGLE_QUOTE (~['\\] | '\\' ['\\])* SINGLE_QUOTE;
DOUBLE_QUOTED_STRING: DOUBLE_QUOTE (~["\\] | '\\' ["\\])* DOUBLE_QUOTE;
// skip
LINE_COMMENT: '//' ~[\r\n]* -> skip;
BLOCK_COMMENT: '/*' .*? '*/' -> skip;
SPACE: [ \n\t\r\u000C]+ -> skip;
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