goyacc: filter expr of micsoft restful api ; yacc lex
实现以下表达式语法解析
| Operator | Description | Example |
|---|---|---|
| Comparison Operators | ||
| eq | Equal | city eq 'Redmond' |
| ne | Not equal | city ne 'London' |
| gt | Greater than | price gt 20 |
| ge | Greater than or equal | price ge 10 |
| lt | Less than | price lt 20 |
| le | Less than or equal | price le 100 |
| Logical Operators | ||
| and | Logical and | price le 200 and price gt 3.5 |
| or | Logical or | price le 3.5 or price gt 200 |
| not | Logical negation | not price le 3.5 |
| Grouping Operators | ||
| ( ) | Precedence grouping | (priority eq 1 or city eq 'Redmond') and price gt 100 |