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exosql
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0.1.1
0.1.0
Universal SQL engine for Elixir. This library implements the SQL logic to perform queries on user provided databases using a simple interface based on Foreign Data Wrappers from PostgreSQL.
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src/sql_lexer.xrl
Definitions.
INT = [0-9]+
MINUS = -
RESERVEDL = (select|where|from|as|inner|cross|left|right|outer|join|on|group|by|order|asc|desc)
RESERVEDU = (SELECT|WHERE|FROM|AS|INNER|CROSS|LEFT|RIGHT|OUTER|JOIN|ON|GROUP|BY|ORDER|ASC|DESC)
ID = [_a-zA-Z][_a-zA-Z0-9]*
COMMA = ,
DOT = \.
OP = (<=|>=|==|!=|<>|-|\+|<|>|=|and|or|AND|OR|\|\||\*|/)
SPACE = [\n\t\s]+
OPEN_PAR = \(
CLOSE_PAR = \)
QUOTED_STRING = ("([^"])*"|'([^'])*')
%% "
VAR = \$[_a-zA-Z][_a-zA-Z0-9]*
Rules.
{SPACE} : skip_token.
{RESERVEDL} : {token, {list_to_atom(string:to_upper(TokenChars)), TokenLine}}.
{RESERVEDU} : {token, {list_to_atom(TokenChars), TokenLine}}.
{OP} : {token, {op, TokenLine, TokenChars}}.
{ID} : {token, {id, TokenLine, TokenChars}}.
{COMMA} : {token, {comma, TokenLine, TokenChars}}.
{DOT} : {token, {dot, TokenLine, TokenChars}}.
{OPEN_PAR} : {token, {open_par, TokenLine, TokenChars}}.
{CLOSE_PAR} : {token, {close_par, TokenLine, TokenChars}}.
{INT}{DOT}{INT} : {token, {lit, TokenLine, TokenChars}}.
{INT} : {token, {lit, TokenLine, TokenChars}}.
{MINUS}{INT}{DOT}{INT} : {token, {lit, TokenLine, TokenChars}}.
{MINUS}{INT} : {token, {lit, TokenLine, TokenChars}}.
{QUOTED_STRING} : {token, {lit, TokenLine, string:substr(TokenChars, 2, string:len(TokenChars)-2)}}.
{VAR} : {token, {var, TokenLine, string:substr(TokenChars, 2, string:len(TokenChars))}}.
Erlang code.