pip install mindsdb_sql_parser 

from mindsdb_sql_parser import parse_sql query = parse_sql('select b from aaa where c=1') # result is abstract syntax tree (AST)  query # string representation of AST query.to_tree() # representation of tree as sql string. it can not exactly match with original sql query.to_string()

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ITIL Service Catalog Template Parsing consists of 2 stages, (separate module for every dialect): Timeline Spreadsheet Template

• Defining keywords in lexer.py module. It is made mostly with regexp
• Defining syntax rules in parser.py module. It is made by describing rules in Product History Timeline Template Airline
  • Syntax is defined in decorator of function. Inside of decorator you can use keyword itself or other function from parser
  • Output of function can be used as input in other functions of parser
  • Outputs of the parser is listed in "Top-level statements". It has to be Abstract syntax tree (AST) object.

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• Structure of AST is defined in separate modules (in parser/ast/).
• It can be inherited
• Every class have to have these methods:
  • to_tree - to return hierarchical representation of object
  • get_string - to return object as sql expression (or sub-expression)
  • copy - to copy AST-tree to new object

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1. it shows location of error if

• character isn't parsed (by lexer)
• token is unexpected (by parser)

2. it tries to propose correct token instead (or before) error location. Possible options

• Keyword will be showed as is.
• '[number]' - if float and integer is expected
• '[string]' - if string is expected
• '[identifier]' - if name of the objects is expected. For example, they are bold words here:
  • "select x as name from tbl1 where col=1"

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• it tries to replace bad token with other token from list of possible tokens
• tries to parse query once again, if there is no error:
  • add this token to suggestion list
• second iteration: put possible token before bad token (instead of replacement) and repeat the same operation.

pip install -r requirements_test.txt env PYTHONPATH=./ pytest