Implement simple comparison, conjunction and disjunction.

For example handle the following:

$match: color:#660e7a}$expr: {{color:#660e7a}$or: : [{{color:#660e7a}$eq: ["$a", 1]}, {{color:#660e7a}$eq: ["$b", 2" target="_blank" rel="noopener">{{color:#660e7a}$and: [{{color:#660e7a}$eq: ["$a", 1]}, {{color:#660e7a}$eq: ["$b", 2}]},{{color:#660e7a}$eq: ["$c", 3]},]