Grammar file for pegjs to parse query expression in the form: strVar="asdf", numVar>=2314

gistfile1.txt

// Generate the parser either by pasting this grammar into 
// http://pegjs.majda.cz/online or using the node.js pegjs 
// parser.  Set the generated class to "aviParser".
//

{
  function clearNode() {
    this.node = null;
  };

  function startNode(type, field) {
    this.node = {
      type: type,
      value: field,
    };
    return field;
  };

  function parseNumber(integral, fractional) {
    if (fractional) {
        return parseFloat(integral.join('') + '.' + fractional[1].join(''));
    } else {
        return parseInt(integral.join(''));
    }
  };

  function finishExpr(field, op, query) {
    clearNode();
    return {
      field: field,
      op: op,
      query: query,
    };
  };

  function finishExprList(list) {
    var ret=[];
    for (var i=0; i < list.length; ++i) {
      ret.push(list[i][0]);
    }
    return ret;
  }
}

// main expression
start 
  = expr_list_l4
  / expr_list_l7

// whitespace, quotes
quote_double = "\""
quote_single = "'"
space = [ ]+

// words, reserved field names, and ops
word 
  = chars:[a-zA-Z0-9/()'?#\\\[\]]+ {
    return chars.join('');
  }

number
  = integral:[0-9]+ fractional:( '.' [0-9]+ )? {
    return parseNumber(integral, fractional);
  }

// l4 fields
l4_number_fields 
  = "significant"
  / "client_src_port"
  / "client_dest_port"
  / "start_timestamp"
  / "report_timestamp"
  / "duration"
  / "rtt"
  / "mss"
  / "rx_bytes"
  / "tx_bytes"
  / "total_bytes"
  / "rx_pkts"
  / "tx_pkts"
  / "total_pkts"
  / "out_of_orders"
  / "retransmits"
  / "timeouts"
  / "zero_window_size_events"
  / "vcpu_id"
  / "log_id"
  / "server_dest_port"
  / "server_src_port"
  / "server_rtt"
  / "server_total_bytes"
  / "server_rx_bytes"
  / "server_tx_bytes"
  / "server_total_pkts"
  / "server_rx_pkts"
  / "server_tx_pkts"
  / "server_out_of_orders"
  / "server_retransmits"
  / "server_timeouts"
  / "server_zero_window_size_events"

l4_string_fields
  = "significance"
  / "virtualserver"
  / "client_country"
  / "service_engine"
  / "network_security_policy_rule_name"
  / "analytics_policy_rule_name"
  / "pool"
  / "server_name"

// app fields
l7_number_fields 
  = "significant"
  / "report_timestamp"
  / "vcpu_id"
  / "log_id"
  / "client_src_port"
  / "client_dest_port"
  / "client_rtt"
  / "request_length"
  / "server_dest_port"
  / "server_src_port"
  / "server_rtt"
  / "server_resp_length"
  / "server_resp_code"
  / "server_resp_time_first_byte"
  / "server_resp_time_last_byte"
  / "resp_length"
  / "resp_code"
  / "resp_time_first_byte"
  / "resp_time_last_byte"
  / "compression_percentage"

l7_string_fields
  = "significance"
  / "virtualserver"
  / "service_engine"
  / "client_country"
  / "ssl_session_id"
  / "http_version"
  / "method"
  / "uri_path"
  / "uri_query"
  / "referer"
  / "user_agent"
  / "client_device"
  / "client_browser"
  / "xff"
  / "persistent_cookie"
  / "host"
  / "etag"
  / "http_security_policy_rule_name"
  / "http_request_policy_rule_name"
  / "http_response_policy_rule_name"
  / "pool"
  / "server_name"
  / "connection_error_info"

// operations
string_ops
  = "="     { return "eq"; }
  / "!="    { return "ne"; }
  / "~="    { return "co"; }
  / "!~="   { return "nc"; }
  / "^="    { return "sw"; }
  / "$="    { return "ew"; }

number_ops
  = "="     { return "eq"; }
  / "!="    { return "ne"; }
  / ">="    { return "gte"; }
  / ">"     { return "ge"; }
  / "<="    { return "lte"; }
  / "<"     { return "le"; }

// tracking failure points
expr_l4_number_field 
  = field:l4_number_fields {
    return startNode('l4_number_field', field);
  }

expr_l7_number_field 
  = field:l7_number_fields {
    return startNode('l7_number_field', field);
  }

expr_l4_string_field 
  = field:l4_string_fields {
    return startNode('l4_number_field', field);
  }

expr_l7_string_field 
  = field:l7_string_fields {
    return startNode('l7_number_field', field);
  }

expr_string_op
  = space? op:string_ops space? {
    return startNode('string_op', op);
  }

expr_number_op
  = space? op:number_ops space? {
    return startNode('number_op', op);
  }

expr_query_string
  = query:word {
    return startNode('string', query);
  }

expr_query_number
  = query:number {
    return startNode('number', query);
  }

// various expression types
expr_l4
  = field:expr_l4_string_field op:expr_string_op quote_double query:expr_query_string quote_double {
    return finishExpr(field, op, query);
  }
  / field:expr_l4_string_field op:expr_string_op quote_single query:expr_query_string quote_single {
    return finishExpr(field, op, query);
  }
  / field:expr_l4_number_field op:expr_number_op query:expr_query_number {
    return finishExpr(field, op, query);
  }

expr_l7
  = field:expr_l7_string_field op:expr_string_op quote_double query:expr_query_string quote_double {
    return finishExpr(field, op, query);
  }
  / field:expr_l7_string_field op:expr_string_op quote_single query:expr_query_string quote_single {
    return finishExpr(field, op, query);
  }
  / field:expr_l7_number_field op:expr_number_op query:expr_query_number {
    return finishExpr(field, op, query);
  }

// the repeated list of expression
expr_list_delim
  = space? ","? space?

expr_list_l4
  = "l4:" space? list:(expr_l4 expr_list_delim?)+ {
    return finishExprList(list);
  }

expr_list_l7
  = "l7:" space? list:(expr_l7 expr_list_delim?)+ {
    return finishExprList(list);
  }