diff --git a/experimental/src/compute/ast.rs b/experimental/src/compute/ast.rs
new file mode 100644
index 000000000..9b8b4cffc
--- /dev/null
+++ b/experimental/src/compute/ast.rs
@@ -0,0 +1,267 @@
+use snmp::{SnmpItem, SnmpResult};
+use std::str;
+
+#[derive(Debug)]
+pub enum Expr<'input> {
+    Id(&'input [u8]),
+    Number(f64),
+    OpPlus(Box<Expr<'input>>, Box<Expr<'input>>),
+    OpMinus(Box<Expr<'input>>, Box<Expr<'input>>),
+    OpStar(Box<Expr<'input>>, Box<Expr<'input>>),
+    OpSlash(Box<Expr<'input>>, Box<Expr<'input>>),
+    Fn(Func, Box<Expr<'input>>),
+}
+
+#[derive(Debug)]
+pub enum Func {
+    Average,
+    Min,
+    Max,
+}
+
+#[derive(Debug)]
+pub enum ExprResult {
+    Vector(Vec<f64>),
+    Scalar(f64),
+}
+
+impl std::ops::Add for ExprResult {
+    type Output = ExprResult;
+
+    fn add(self, other: Self) -> Self::Output {
+        match (self, other) {
+            (ExprResult::Scalar(a), ExprResult::Scalar(b)) => ExprResult::Scalar(a + b),
+            (ExprResult::Vector(a), ExprResult::Vector(b)) => {
+                let len_a = a.len();
+                let len_b = b.len();
+                if len_a == len_b {
+                    let mut result = Vec::with_capacity(len_a);
+                    for i in 0..len_a {
+                        result.push(a[i] + b[i]);
+                    }
+                    ExprResult::Vector(result)
+                } else {
+                    if len_a > len_b {
+                        let mut result = a.clone();
+                        for (idx, value) in b.iter().enumerate() {
+                            result[idx] += value;
+                        }
+                        ExprResult::Vector(result)
+                    } else {
+                        let mut result = b.clone();
+                        for (idx, value) in a.iter().enumerate() {
+                            result[idx] += value;
+                        }
+                        ExprResult::Vector(result)
+                    }
+                }
+            }
+            (ExprResult::Scalar(a), ExprResult::Vector(b)) => {
+                let mut result = b.clone();
+                for value in result.iter_mut() {
+                    *value += a;
+                }
+                ExprResult::Vector(result)
+            }
+            (ExprResult::Vector(a), ExprResult::Scalar(b)) => {
+                let mut result = a.clone();
+                for value in result.iter_mut() {
+                    *value += b;
+                }
+                ExprResult::Vector(result)
+            }
+        }
+    }
+}
+
+impl std::ops::Sub for ExprResult {
+    type Output = ExprResult;
+
+    fn sub(self, other: Self) -> Self::Output {
+        match (self, other) {
+            (ExprResult::Scalar(a), ExprResult::Scalar(b)) => ExprResult::Scalar(a - b),
+            (ExprResult::Vector(a), ExprResult::Vector(b)) => {
+                let len_a = a.len();
+                let len_b = b.len();
+                if len_a == len_b {
+                    let mut result = Vec::with_capacity(len_a);
+                    for i in 0..len_a {
+                        result.push(a[i] - b[i]);
+                    }
+                    ExprResult::Vector(result)
+                } else {
+                    if len_a > len_b {
+                        let mut result = a.clone();
+                        for (idx, value) in b.iter().enumerate() {
+                            result[idx] -= value;
+                        }
+                        ExprResult::Vector(result)
+                    } else {
+                        let mut result = b.clone();
+                        for (idx, value) in a.iter().enumerate() {
+                            result[idx] -= value;
+                        }
+                        ExprResult::Vector(result)
+                    }
+                }
+            }
+            (ExprResult::Scalar(a), ExprResult::Vector(b)) => {
+                let mut result = vec![0_f64; b.len()];
+                for (idx, value) in result.iter_mut().enumerate() {
+                    *value = a - b[idx];
+                }
+                ExprResult::Vector(result)
+            }
+            (ExprResult::Vector(a), ExprResult::Scalar(b)) => {
+                let mut result = a.clone();
+                for value in result.iter_mut() {
+                    *value -= b;
+                }
+                ExprResult::Vector(result)
+            }
+        }
+    }
+}
+
+impl std::ops::Mul for ExprResult {
+    type Output = ExprResult;
+
+    fn mul(self, other: Self) -> Self::Output {
+        match (self, other) {
+            (ExprResult::Scalar(a), ExprResult::Scalar(b)) => ExprResult::Scalar(a * b),
+            (ExprResult::Vector(a), ExprResult::Vector(b)) => {
+                let len_a = a.len();
+                let len_b = b.len();
+                if len_a == len_b {
+                    let mut result = Vec::with_capacity(len_a);
+                    for i in 0..len_a {
+                        result.push(a[i] * b[i]);
+                    }
+                    ExprResult::Vector(result)
+                } else {
+                    if len_a > len_b {
+                        let mut result = a.clone();
+                        for (idx, value) in b.iter().enumerate() {
+                            result[idx] *= value;
+                        }
+                        ExprResult::Vector(result)
+                    } else {
+                        let mut result = b.clone();
+                        for (idx, value) in a.iter().enumerate() {
+                            result[idx] *= value;
+                        }
+                        ExprResult::Vector(result)
+                    }
+                }
+            }
+            (ExprResult::Scalar(a), ExprResult::Vector(b)) => {
+                let mut result = b.clone();
+                for value in result.iter_mut() {
+                    *value *= a;
+                }
+                ExprResult::Vector(result)
+            }
+            (ExprResult::Vector(a), ExprResult::Scalar(b)) => {
+                let mut result = a.clone();
+                for value in result.iter_mut() {
+                    *value *= b;
+                }
+                ExprResult::Vector(result)
+            }
+        }
+    }
+}
+
+impl std::ops::Div for ExprResult {
+    type Output = ExprResult;
+
+    fn div(self, other: Self) -> Self::Output {
+        match (self, other) {
+            (ExprResult::Scalar(a), ExprResult::Scalar(b)) => ExprResult::Scalar(a / b),
+            (ExprResult::Vector(a), ExprResult::Vector(b)) => {
+                let len_a = a.len();
+                let len_b = b.len();
+                if len_a == len_b {
+                    let mut result = Vec::with_capacity(len_a);
+                    for i in 0..len_a {
+                        result.push(a[i] / b[i]);
+                    }
+                    ExprResult::Vector(result)
+                } else {
+                    if len_a > len_b {
+                        let mut result = a.clone();
+                        for (idx, value) in b.iter().enumerate() {
+                            result[idx] /= value;
+                        }
+                        ExprResult::Vector(result)
+                    } else {
+                        let mut result = b.clone();
+                        for (idx, value) in a.iter().enumerate() {
+                            result[idx] /= value;
+                        }
+                        ExprResult::Vector(result)
+                    }
+                }
+            }
+            (ExprResult::Scalar(a), ExprResult::Vector(b)) => {
+                let mut result = vec![0_f64; b.len()];
+                for (idx, value) in result.iter_mut().enumerate() {
+                    *value = a / b[idx];
+                }
+                ExprResult::Vector(result)
+            }
+            (ExprResult::Vector(a), ExprResult::Scalar(b)) => {
+                let mut result = a.clone();
+                for value in result.iter_mut() {
+                    *value /= b;
+                }
+                ExprResult::Vector(result)
+            }
+        }
+    }
+}
+
+impl<'input> Expr<'input> {
+    pub fn eval(&self, collect: &Vec<SnmpResult>) -> ExprResult {
+        match self {
+            Expr::Number(n) => ExprResult::Scalar(*n),
+            Expr::Id(key) => {
+                for result in collect {
+                    let k = str::from_utf8(key).unwrap();
+                    let item = &result.items[k];
+                    match item {
+                        SnmpItem::Nbr(n) => {
+                            if n.len() == 1 {
+                                return ExprResult::Scalar(n[0]);
+                            } else {
+                                return ExprResult::Vector(n.clone());
+                            }
+                        }
+                        _ => panic!("Should be a number"),
+                    }
+                }
+                ExprResult::Scalar(0.0)
+            }
+            Expr::OpPlus(left, right) => left.eval(collect) + right.eval(collect),
+            Expr::OpMinus(left, right) => left.eval(collect) - right.eval(collect),
+            Expr::OpStar(left, right) => left.eval(collect) * right.eval(collect),
+            Expr::OpSlash(left, right) => left.eval(collect) / right.eval(collect),
+            Expr::Fn(func, expr) => {
+                let v = expr.eval(collect);
+                match func {
+                    Func::Average => v,
+                    Func::Min => v,
+                    Func::Max => v,
+                }
+            }
+        }
+    }
+
+    pub fn eval_as_str(&self) -> &[u8] {
+        if let Expr::Id(id) = self {
+            return id;
+        } else {
+            return b"Bad value";
+        }
+    }
+}
diff --git a/experimental/src/compute/lexer.rs b/experimental/src/compute/lexer.rs
index c44e837c7..d7ffd2098 100644
--- a/experimental/src/compute/lexer.rs
+++ b/experimental/src/compute/lexer.rs
@@ -4,20 +4,23 @@ use std::str;
 pub type Spanned<Tok, Loc, Error> = Result<(Loc, Tok, Loc), Error>;
 
 #[derive(Debug, PartialEq, Clone)]
-pub enum Tok {
-    Num(f32),
-    Id,
+pub enum Tok<'input> {
+    Num(f64),
+    Id(&'input [u8]),
     OpStar,
     OpSlash,
     OpPlus,
     OpMinus,
     LParen,
     RParen,
+    LBrace,
+    RBrace,
 }
 
 #[derive(Debug, PartialEq)]
 pub enum LexicalError {
     NotPossible,
+    UnmatchedBrace,
     // Not possible
 }
 
@@ -35,8 +38,9 @@ impl<'input> Lexer<'input> {
         }
     }
 
-    fn number(&mut self, start: usize, chars: &[u8]) -> Option<Spanned<Tok, usize, LexicalError>> {
+    fn number(&mut self, start: usize) -> Option<Spanned<Tok<'input>, usize, LexicalError>> {
         // Consume digits and decimal points
+        let chars = self.chars.as_bytes();
         let mut end = start;
         let mut done = false;
         for c in chars[(start + 1)..].iter() {
@@ -59,22 +63,19 @@ impl<'input> Lexer<'input> {
         self.offset = end;
         let value = str::from_utf8(&chars[start..end])
             .unwrap_or("Bad value")
-            .parse::<f32>()
+            .parse::<f64>()
             .unwrap_or(0.0);
         Some(Ok((start, Tok::Num(value), end)))
     }
 
-    fn identifier(
-        &mut self,
-        start: usize,
-        chars: &[u8],
-    ) -> Option<Spanned<Tok, usize, LexicalError>> {
+    fn identifier(&mut self, start: usize) -> Option<Spanned<Tok<'input>, usize, LexicalError>> {
         // Consume identifier
+        let chars = self.chars.as_bytes();
         let mut end = start;
         let mut done = false;
         for c in chars[(start + 1)..].iter() {
             end += 1;
-            if !c.is_ascii_alphanumeric() && *c != b'_' {
+            if !c.is_ascii_alphanumeric() && *c != b'_' && *c != b'.' {
                 done = true;
                 break;
             }
@@ -89,12 +90,12 @@ impl<'input> Lexer<'input> {
             str::from_utf8(&chars[start..end]).unwrap_or("Bad value")
         );
         self.offset = end;
-        Some(Ok((start, Tok::Id, end)))
+        Some(Ok((start, Tok::Id(&chars[start..end]), end)))
     }
 }
 
 impl<'input> Iterator for Lexer<'input> {
-    type Item = Spanned<Tok, usize, LexicalError>;
+    type Item = Spanned<Tok<'input>, usize, LexicalError>;
 
     fn next(&mut self) -> Option<Self::Item> {
         for (i, c) in self.chars.as_bytes().iter().enumerate().skip(self.offset) {
@@ -124,12 +125,20 @@ impl<'input> Iterator for Lexer<'input> {
                     self.offset = i + 1;
                     return Some(Ok((i, Tok::RParen, i + 1)));
                 }
+                b'{' => {
+                    self.offset = i + 1;
+                    return Some(Ok((i, Tok::LBrace, i + 1)));
+                }
+                b'}' => {
+                    self.offset = i + 1;
+                    return Some(Ok((i, Tok::RBrace, i + 1)));
+                }
                 b'0'..=b'9' => {
                     // Consume digits and decimal points
-                    return self.number(i, &self.chars.as_bytes());
+                    return self.number(i);
                 }
                 b'a'..=b'z' | b'A'..=b'Z' | b'_' => {
-                    return self.identifier(i, &self.chars.as_bytes());
+                    return self.identifier(i);
                 }
                 _ => {
                     // Unknown character
@@ -151,9 +160,9 @@ mod Test {
     fn test_lexer_num_id_num() {
         let input = "123 abc 456";
         let mut lexer = Lexer::new(input);
-        assert_eq!(lexer.next(), Some(Ok((0, Tok::Num(123_f32), 3))));
-        assert_eq!(lexer.next(), Some(Ok((4, Tok::Id, 7))));
-        assert_eq!(lexer.next(), Some(Ok((8, Tok::Num(456_f32), 11))));
+        assert_eq!(lexer.next(), Some(Ok((0, Tok::Num(123_f64), 3))));
+        assert_eq!(lexer.next(), Some(Ok((4, Tok::Id(b"abc"), 7))));
+        assert_eq!(lexer.next(), Some(Ok((8, Tok::Num(456_f64), 11))));
         assert_eq!(lexer.next(), None);
     }
 
@@ -161,20 +170,20 @@ mod Test {
     fn test_lexer_id_num_id() {
         let input = "abc 123 def";
         let mut lexer = Lexer::new(input);
-        assert_eq!(lexer.next(), Some(Ok((0, Tok::Id, 3))));
-        assert_eq!(lexer.next(), Some(Ok((4, Tok::Num(123_f32), 7))));
-        assert_eq!(lexer.next(), Some(Ok((8, Tok::Id, 11))));
+        assert_eq!(lexer.next(), Some(Ok((0, Tok::Id(b"abc"), 3))));
+        assert_eq!(lexer.next(), Some(Ok((4, Tok::Num(123_f64), 7))));
+        assert_eq!(lexer.next(), Some(Ok((8, Tok::Id(b"def"), 11))));
     }
 
     #[test]
     fn test_lexer_num_op() {
         let input = "1+2*3";
         let mut lexer = Lexer::new(input);
-        assert_eq!(lexer.next(), Some(Ok((0, Tok::Num(1_f32), 1))));
+        assert_eq!(lexer.next(), Some(Ok((0, Tok::Num(1_f64), 1))));
         assert_eq!(lexer.next(), Some(Ok((1, Tok::OpPlus, 2))));
-        assert_eq!(lexer.next(), Some(Ok((2, Tok::Num(2_f32), 3))));
+        assert_eq!(lexer.next(), Some(Ok((2, Tok::Num(2_f64), 3))));
         assert_eq!(lexer.next(), Some(Ok((3, Tok::OpStar, 4))));
-        assert_eq!(lexer.next(), Some(Ok((4, Tok::Num(3_f32), 5))));
+        assert_eq!(lexer.next(), Some(Ok((4, Tok::Num(3_f64), 5))));
         assert_eq!(lexer.next(), None);
     }
 }
diff --git a/experimental/src/compute/mod.rs b/experimental/src/compute/mod.rs
index f22cf1233..0afce862a 100644
--- a/experimental/src/compute/mod.rs
+++ b/experimental/src/compute/mod.rs
@@ -1,6 +1,9 @@
+pub mod ast;
 pub mod lexer;
 
-use lalrpop_util::lalrpop_mod;
+use self::ast::ExprResult;
+use self::lexer::{LexicalError, Tok};
+use lalrpop_util::{lalrpop_mod, ParseError};
 use serde::Deserialize;
 use snmp::SnmpResult;
 
@@ -10,10 +13,10 @@ lalrpop_mod!(grammar);
 pub struct Metric {
     pub name: String,
     pub prefix: Option<String>,
-    value: String,
+    pub value: String,
     uom: Option<String>,
-    min: Option<f32>,
-    max: Option<f32>,
+    min: Option<f64>,
+    max: Option<f64>,
 }
 
 #[derive(Deserialize, Debug)]
@@ -35,8 +38,19 @@ impl<'a> Parser<'a> {
         }
     }
 
-    pub fn eval(&self, expr: &str) -> f32 {
-        2.0_f32
+    pub fn eval(
+        &self,
+        expr: &'a str,
+    ) -> Result<ExprResult, ParseError<usize, Tok<'a>, LexicalError>> {
+        let lexer = lexer::Lexer::new(expr);
+        let res = self.parser.parse(lexer);
+        match res {
+            Ok(res) => {
+                let res = res.eval(self.collect);
+                Ok(res)
+            }
+            Err(e) => Err(e),
+        }
     }
 }
 
@@ -48,7 +62,7 @@ mod Test {
         let lexer = lexer::Lexer::new("123");
         let res = grammar::ExprParser::new().parse(lexer);
         assert!(res.is_ok());
-        assert!(res.unwrap() == 123_f32);
+        assert!(res.unwrap().eval() == 123_f32);
         let lexer = lexer::Lexer::new("123");
         assert!(grammar::ExprParser::new().parse(lexer).is_ok());
         let lexer = lexer::Lexer::new("(((123))");
@@ -61,27 +75,27 @@ mod Test {
         let lexer = lexer::Lexer::new("1 + 2");
         let res = grammar::ExprParser::new().parse(lexer);
         assert!(res.is_ok());
-        assert!(res.unwrap() == 3_f32);
+        assert!(res.unwrap().eval() == 3_f32);
 
         let lexer = lexer::Lexer::new("1 + 2 - 3");
         let res = grammar::ExprParser::new().parse(lexer);
         assert!(res.is_ok());
-        assert!(res.unwrap() == 0_f32);
+        assert!(res.unwrap().eval() == 0_f32);
 
         let lexer = lexer::Lexer::new("1 - 2 + 3");
         let res = grammar::ExprParser::new().parse(lexer);
         assert!(res.is_ok());
-        assert!(res.unwrap() == 2_f32);
+        assert!(res.unwrap().eval() == 2_f32);
 
         let lexer = lexer::Lexer::new("1 - (2 + 3)");
         let res = grammar::ExprParser::new().parse(lexer);
         assert!(res.is_ok());
-        assert!(res.unwrap() == -4_f32);
+        assert!(res.unwrap().eval() == -4_f32);
 
         let lexer = lexer::Lexer::new("1 - (2 + (3 - (4 + (5 - (6 + 7)))))");
         let res = grammar::ExprParser::new().parse(lexer);
         assert!(res.is_ok());
-        assert!(res.unwrap() == -8_f32);
+        assert!((res.unwrap()).eval() == -8_f32);
     }
 
     #[test]
@@ -89,27 +103,27 @@ mod Test {
         let lexer = lexer::Lexer::new("2 * 3");
         let res = grammar::ExprParser::new().parse(lexer);
         assert!(res.is_ok());
-        assert!(res.unwrap() == 6_f32);
+        assert!(res.unwrap().eval() == 6_f32);
 
         let lexer = lexer::Lexer::new("1 + 2 * 3");
         let res = grammar::ExprParser::new().parse(lexer);
         assert!(res.is_ok());
-        assert!(res.unwrap() == 7_f32);
+        assert!(res.unwrap().eval() == 7_f32);
 
         let lexer = lexer::Lexer::new("(1 + 2) * 3");
         let res = grammar::ExprParser::new().parse(lexer);
         assert!(res.is_ok());
-        assert!(res.unwrap() == 9_f32);
+        assert!(res.unwrap().eval() == 9_f32);
 
         let lexer = lexer::Lexer::new("2 * 3 * 4");
         let res = grammar::ExprParser::new().parse(lexer);
         assert!(res.is_ok());
-        assert!(res.unwrap() == 24_f32);
+        assert!(res.unwrap().eval() == 24_f32);
 
         let lexer = lexer::Lexer::new("2 * 3 / 2");
         let res = grammar::ExprParser::new().parse(lexer);
         assert!(res.is_ok());
-        assert!(res.unwrap() == 3_f32);
+        assert!(res.unwrap().eval() == 3_f32);
 
         // We have an issue with 2/0, I know it but we'll fix it later.
     }
@@ -119,7 +133,20 @@ mod Test {
         let lexer = lexer::Lexer::new("1 + (3 + 2 * 3) / 3");
         let res = grammar::ExprParser::new().parse(lexer);
         assert!(res.is_ok());
-        assert!(res.unwrap() == 4_f32);
+        assert!(res.unwrap().eval() == 4_f32);
+    }
+
+    #[test]
+    fn identifier() {
+        let lexer = lexer::Lexer::new("{abc} + 1");
+        let res = grammar::ExprParser::new().parse(lexer);
+        assert!(res.is_ok());
+        println!("{:?}", res);
+        assert!(res.unwrap().eval() == 1_f32);
+
+        let lexer = lexer::Lexer::new("abc + 1");
+        let res = grammar::ExprParser::new().parse(lexer);
+        assert!(res.is_err());
     }
 
     #[test]
diff --git a/experimental/src/generic/mod.rs b/experimental/src/generic/mod.rs
index d6f5b782a..0266520da 100644
--- a/experimental/src/generic/mod.rs
+++ b/experimental/src/generic/mod.rs
@@ -4,7 +4,7 @@ extern crate serde_json;
 use compute::{Compute, Parser};
 use serde::Deserialize;
 use snmp::{snmp_bulk_get, snmp_bulk_walk, snmp_bulk_walk_with_labels};
-use std::collections::{BTreeMap, HashMap};
+use std::collections::HashMap;
 
 #[derive(Copy, Clone, PartialEq)]
 pub enum Status {
@@ -56,7 +56,7 @@ pub struct Snmp {
     name: String,
     oid: String,
     query: QueryType,
-    labels: Option<BTreeMap<String, String>>,
+    labels: Option<HashMap<String, String>>,
 }
 
 #[derive(Deserialize, Debug)]
@@ -82,7 +82,7 @@ pub struct CommandExt {
     pub critical_agregation: Option<String>,
 }
 
-fn compute_status(value: f32, warn: &Option<String>, crit: &Option<String>) -> Status {
+fn compute_status(value: f64, warn: &Option<String>, crit: &Option<String>) -> Status {
     if let Some(c) = crit {
         let crit = c.parse().unwrap();
         if value > crit {
@@ -130,12 +130,20 @@ impl Command {
             }
         }
 
-        let p = Parser::new(&collect);
-        for (idx, metric) in self.compute.metrics.iter().enumerate() {
+        for (i, metric) in self.compute.metrics.iter().enumerate() {
             let name = match &metric.prefix {
-                Some(prefix) => format!("{}#{}", p.eval(prefix), metric.name),
-                None => format!("{}#{}", idx, metric.name),
+                Some(prefix) => {
+                    format!("{:?}#{}", prefix, metric.name)
+                }
+
+                None => format!("{}#{}", i, metric.name),
             };
+            println!("name: {}", name);
+            let value = &metric.value;
+            println!("value: {}", value);
+            let parser = Parser::new(&collect);
+            let value = parser.eval(value).unwrap();
+            println!("value result: {:?}", value);
         }
 
         if !to_get.is_empty() {
diff --git a/experimental/src/grammar.lalrpop b/experimental/src/grammar.lalrpop
index f9b0f8eb2..7924053b1 100644
--- a/experimental/src/grammar.lalrpop
+++ b/experimental/src/grammar.lalrpop
@@ -1,23 +1,24 @@
-use std::str::FromStr;
 use compute::lexer;
+use compute::ast;
 
-grammar;
+grammar<'input>;
 
-pub Expr: f32 = {
-    <s:Expr> "+" <p:Product> => s + p,
-    <s:Expr> "-" <p:Product> => s - p,
-    <p:Product> => p,
+pub Expr: Box<ast::Expr<'input>> = {
+    <s:Expr> "+" <p:Product> => Box::new(ast::Expr::OpPlus(<>)),
+    <s:Expr> "-" <p:Product> => Box::new(ast::Expr::OpMinus(<>)),
+    Product,
 };
 
-pub Product: f32 = {
-    <s:Product> "*" <v:Term> => s * v,
-    <s:Product> "/" <v:Term> => s / v,
-    <v:Term> => v,
+pub Product: Box<ast::Expr<'input>> = {
+    <s:Product> "*" <v:Term> => Box::new(ast::Expr::OpStar(<>)),
+    <s:Product> "/" <v:Term> => Box::new(ast::Expr::OpSlash(<>)),
+    <v:Term> => <>,
 };
 
-pub Term: f32 = {
-    "num" => <>,
-    "(" <v:Expr> ")" => v,
+pub Term: Box<ast::Expr<'input>> = {
+    "num" => Box::new(ast::Expr::Number(<>)),
+    "(" <v:Expr> ")" => <>,
+    "{" <"id"> "}" => Box::new(ast::Expr::Id(<>)),
 };
 
 extern {
@@ -26,13 +27,16 @@ extern {
 
     // ...
 
-    enum lexer::Tok {
+    enum lexer::Tok<'input> {
 	"*" => lexer::Tok::OpStar,
 	"/" => lexer::Tok::OpSlash,
 	"+" => lexer::Tok::OpPlus,
 	"-" => lexer::Tok::OpMinus,
 	"(" => lexer::Tok::LParen,
 	")" => lexer::Tok::RParen,
-	"num" => lexer::Tok::Num(<f32>)
+	"{" => lexer::Tok::LBrace,
+	"}" => lexer::Tok::RBrace,
+	"num" => lexer::Tok::Num(<f64>),
+	"id" => lexer::Tok::Id(<&'input [u8]>),
     }
 }
diff --git a/experimental/src/main.rs b/experimental/src/main.rs
index ebc8ea290..c5494af1b 100644
--- a/experimental/src/main.rs
+++ b/experimental/src/main.rs
@@ -12,7 +12,7 @@ mod compute;
 mod generic;
 mod snmp;
 
-use generic::{Command, CommandExt};
+use generic::Command;
 use lalrpop_util::lalrpop_mod;
 use serde_json::Result;
 //use snmp::snmp_get;
diff --git a/experimental/src/snmp/mod.rs b/experimental/src/snmp/mod.rs
index df54abd45..9534c7ec2 100644
--- a/experimental/src/snmp/mod.rs
+++ b/experimental/src/snmp/mod.rs
@@ -11,26 +11,26 @@ use rasn_snmp::v2::VarBind;
 use rasn_snmp::v2::VarBindValue;
 use rasn_snmp::v2::{GetBulkRequest, GetNextRequest, GetRequest};
 use rasn_snmp::v2c::Message;
-use std::collections::BTreeMap;
+use std::collections::HashMap;
 use std::convert::TryInto;
 use std::net::UdpSocket;
 
 pub enum ValueType {
     None(()),
     Integer(i64),
-    Float(f32),
+    Float(f64),
     String(String),
 }
 
 #[derive(Debug)]
 pub enum SnmpItem {
-    Nbr(Vec<f32>),
+    Nbr(Vec<f64>),
     Str(Vec<String>),
 }
 
 #[derive(Debug)]
 pub struct SnmpResult {
-    items: BTreeMap<String, SnmpItem>,
+    pub items: HashMap<String, SnmpItem>,
     last_oid: Vec<u32>,
 }
 
@@ -179,7 +179,7 @@ pub fn snmp_bulk_get<'a>(
         .collect::<Vec<Vec<u32>>>();
 
     let mut retval = SnmpResult {
-        items: BTreeMap::new(),
+        items: HashMap::new(),
         last_oid: Vec::new(),
     };
     let mut request_id: i32 = 1;
@@ -256,7 +256,7 @@ pub fn snmp_bulk_walk<'a>(
         .collect::<Vec<u32>>();
     let mut oid_tab = &oid_init;
     let mut retval = SnmpResult {
-        items: BTreeMap::new(),
+        items: HashMap::new(),
         last_oid: Vec::new(),
     };
     let request_id: i32 = 1;
@@ -314,7 +314,7 @@ pub fn snmp_bulk_walk_with_labels<'a>(
     community: &str,
     oid: &str,
     snmp_name: &str,
-    labels: &'a BTreeMap<String, String>,
+    labels: &'a HashMap<String, String>,
 ) -> SnmpResult {
     let oid_init = oid
         .split('.')
@@ -323,7 +323,7 @@ pub fn snmp_bulk_walk_with_labels<'a>(
 
     let mut oid_tab = &oid_init;
     let mut retval = SnmpResult {
-        items: BTreeMap::new(),
+        items: HashMap::new(),
         last_oid: Vec::new(),
     };
     let request_id: i32 = 1;
@@ -380,7 +380,7 @@ impl SnmpResult {
         decoded: Message<Pdus>,
         oid: &str,
         snmp_name: &str,
-        labels: &'a BTreeMap<String, String>,
+        labels: &'a HashMap<String, String>,
         walk: bool,
     ) -> bool {
         let mut completed = false;
@@ -461,7 +461,7 @@ impl SnmpResult {
                                     ValueType::String(_) => {
                                         panic!("Value should be a float");
                                     }
-                                    ValueType::Integer(i) => *i as f32,
+                                    ValueType::Integer(i) => *i as f64,
                                 }),
                                 SnmpItem::Str(v) => v.push(match &typ {
                                     ValueType::Float(_) => {
@@ -482,7 +482,7 @@ impl SnmpResult {
                                     panic!("Should not arrive");
                                 }
                                 ValueType::String(s) => SnmpItem::Str(vec![s]),
-                                ValueType::Integer(i) => SnmpItem::Nbr(vec![i as f32]),
+                                ValueType::Integer(i) => SnmpItem::Nbr(vec![i as f64]),
                             });
                     }
                 }
@@ -572,7 +572,7 @@ impl SnmpResult {
                             ValueType::String(_) => {
                                 panic!("Value should be a float");
                             }
-                            ValueType::Integer(i) => *i as f32,
+                            ValueType::Integer(i) => *i as f64,
                         }),
                         SnmpItem::Str(v) => v.push(match &typ {
                             ValueType::Float(_) => {
@@ -593,7 +593,7 @@ impl SnmpResult {
                             panic!("Should not arrive");
                         }
                         ValueType::String(s) => SnmpItem::Str(vec![s]),
-                        ValueType::Integer(i) => SnmpItem::Nbr(vec![i as f32]),
+                        ValueType::Integer(i) => SnmpItem::Nbr(vec![i as f64]),
                     });
             }
         }
@@ -714,7 +714,7 @@ impl SnmpResult {
                             ValueType::String(_) => {
                                 panic!("Value should be a float");
                             }
-                            ValueType::Integer(i) => *i as f32,
+                            ValueType::Integer(i) => *i as f64,
                         }),
                         SnmpItem::Str(v) => v.push(match &typ {
                             ValueType::Float(_) => {
@@ -735,7 +735,7 @@ impl SnmpResult {
                             panic!("Should not arrive");
                         }
                         ValueType::String(s) => SnmpItem::Str(vec![s]),
-                        ValueType::Integer(i) => SnmpItem::Nbr(vec![i as f32]),
+                        ValueType::Integer(i) => SnmpItem::Nbr(vec![i as f64]),
                     });
             }
         }