Indexing into lists/maps.

First test with literal list completed. When it's assigned to a var if fails

src/ast_compiler.rs

@@ -1,12 +1,14 @@
-use crate::ast_compiler::Expression::{FunctionCall, NamedParameter, Stop, Variable};
+use crate::ast_compiler::Expression::{
+    FieldGet, FunctionCall, ListGet, MapGet, NamedParameter, Stop, Variable,
+};
 use crate::errors::CompilerError::{
     self, Expected, IncompatibleTypes, ParseError, TooManyParameters, TypeError,
     UndeclaredVariable, UnexpectedIndent, UninitializedVariable,
 };
 use crate::errors::CompilerErrorAtLine;
 use crate::tokens::TokenType::{
-    Bang, Bool, Char, Colon, DateTime, Dot, Eof, Eol, Equal, F32, F64, False, FloatingPoint,
+    Bang, Bool, Char, Colon, DateTime, Dot, Eof, Eol, Equal, F32, F64, False, FloatingPoint, Fn,
-    Fn, Greater, GreaterEqual, GreaterGreater, I32, I64, Identifier, Indent, Integer, LeftBrace,
+    Greater, GreaterEqual, GreaterGreater, I32, I64, Identifier, Indent, Integer, LeftBrace,
     LeftBracket, LeftParen, Less, LessEqual, LessLess, Let, ListType, MapType, Minus, Object, Plus,
     Print, RightBrace, RightBracket, RightParen, SignedInteger, SingleRightArrow, Slash, Star,
     StringType, True, U32, U64, UnsignedInteger,
@@ -14,6 +16,7 @@ use crate::tokens::TokenType::{
 use crate::tokens::{Token, TokenType};
 use crate::value::Value;
 use log::debug;
+use tokio_postgres::fallible_iterator::FallibleIterator;
 
 pub fn compile(
     path: Option<&str>,
@@ -401,10 +404,63 @@ impl AstCompiler {
                 right: Box::new(right),
             })
         } else {
-            self.primary()
+            let expr = self.get();
+            expr
         }
     }
 
+    fn get(&mut self) -> Result<Expression, CompilerErrorAtLine> {
+        let expr = self.primary()?;
+
+        if self.match_token(vec![LeftParen]) {
+            let name = self.peek().clone();
+            self.advance();
+            self.function_call(name)
+        } else if self.match_token(vec![LeftBracket]) {
+            let name = self.peek().clone();
+            self.advance();
+            self.index(expr, name)
+        } else if self.match_token(vec![Dot]){
+            let name = self.peek().clone();
+            self.advance();
+            self.field(expr, name)
+        } else {
+            Ok(expr)
+        }
+    }
+
+    fn index(
+        &mut self,
+        operand: Expression,
+        index: Token,
+    ) -> Result<Expression, CompilerErrorAtLine> {
+        let get = (match operand {
+            Expression::Map { .. } => MapGet {
+                key: index.lexeme.clone(),
+            },
+            Expression::List { .. } => ListGet {
+                list: Box::new(operand),
+                index: index.lexeme.clone().parse().map_err(|_| {
+                    self.raise(CompilerError::IllegalTypeToIndex(index.lexeme.clone()))
+                })?,
+            },
+            _ => return Err(self.raise(CompilerError::IllegalTypeToIndex("".to_string()))),
+        });
+        self.consume(RightBracket, Expected("']' after index."))?;
+        Ok(get)
+    }
+
+    fn field(
+        &mut self,
+        operand: Expression,
+        index: Token,
+    ) -> Result<Expression, CompilerErrorAtLine> {
+        //TODO?
+        Ok(Expression::FieldGet {
+            field: index.lexeme.clone(),
+        })
+    }
+
     fn primary(&mut self) -> Result<Expression, CompilerErrorAtLine> {
         debug!("primary {:?}", self.peek());
         Ok(if self.match_token(vec![LeftBracket]) {
@@ -500,34 +556,35 @@ impl AstCompiler {
             debug!("{:?}", token);
             // function call?
             if self.match_token(vec![LeftParen]) {
-                self.function_call(token.lexeme)?
+                self.function_call(token.clone())?
             } else if self.match_token(vec![Colon]) {
                 self.named_parameter(&token)?
-            } else if self.check(Dot) {
+            } else {
+                // } else if self.check(Dot) {
                 // chain of variable or function lookups?
-                let mut name = "/".to_string();
+                // let mut name = "/".to_string();
-                name.push_str(&self.previous().lexeme);
+                // name.push_str(&self.previous().lexeme);
-                while self.match_token(vec![Dot]) {
+                // while self.match_token(vec![Dot]) {
-                    name.push_str("/");
+                //     name.push_str("/");
-                    name.push_str(&self.peek().lexeme);
+                //     name.push_str(&self.peek().lexeme);
-                    self.advance();
+                //     self.advance();
-                }
+                // }
                 // chained function call?
-                if self.match_token(vec![LeftParen]) {
+                // if self.match_token(vec![LeftParen]) {
-                    self.function_call(name)?
+                //     self.function_call(name())?
-                } else {
+                // } else {
                 // empty line
-                    return if self.match_token(vec![Eol, Eof]) {
+                // return if self.match_token(vec![Eol, Eof]) {
-                        Ok(Expression::Literal {
+                //     Ok(Expression::Literal {
-                            value: Value::Void,
+                //         value: Value::Void,
-                            literaltype: Object,
+                //         literaltype: Object,
-                            line: token.line,
+                //         line: token.line,
-                        })
+                //     })
-                    } else {
+                // } else {
-                        Err(self.raise(UndeclaredVariable(token.lexeme.clone())))
+                //     Err(self.raise(UndeclaredVariable(token.lexeme.clone())))
-                    };
+                // };
-                }
+                // }
-            } else {
+                // } else {
                 // none of the above, must be a variable lookup
                 self.variable_lookup(&token)?
             }
@@ -591,7 +648,7 @@ impl AstCompiler {
         })
     }
 
-    fn function_call(&mut self, name: String) -> Result<Expression, CompilerErrorAtLine> {
+    fn function_call(&mut self, name: Token) -> Result<Expression, CompilerErrorAtLine> {
         let mut arguments = vec![];
         while !self.match_token(vec![RightParen]) {
             if arguments.len() >= 25 {
@@ -608,7 +665,7 @@ impl AstCompiler {
         }
         Ok(FunctionCall {
             line: self.peek().line,
-            name,
+            name: name.lexeme.to_string(),
             arguments,
         })
     }
@@ -759,15 +816,25 @@ pub enum Expression {
     Stop {
         line: usize,
     },
-    PathMatch {
+    // PathMatch {
-        line: usize,
+    //     line: usize,
-        condition: Box<Expression>,
+    //     condition: Box<Expression>,
-    },
+    // },
     NamedParameter {
         line: usize,
         name: Token,
         value: Box<Expression>,
     },
+    MapGet {
+        key: String,
+    },
+    ListGet {
+        list: Box<Expression>,
+        index: usize,
+    },
+    FieldGet {
+        field: String,
+    },
 }
 
 impl Expression {
@@ -782,8 +849,28 @@ impl Expression {
             Variable { line, .. } => *line,
             FunctionCall { line, .. } => *line,
             Stop { line } => *line,
-            Expression::PathMatch { line, .. } => *line,
+            // Expression::PathMatch { line, .. } => *line,
             NamedParameter { line, .. } => *line,
+            MapGet { .. } => 0,
+            ListGet { .. } => 0,
+            FieldGet { .. } => 0,
         }
     }
+
+    // pub fn get_type(&self) -> &str {
+    //     match self {
+    //         Expression::Binary { .. } => "binary",
+    //         Expression::Unary { .. } => TokenType::Unknown,
+    //         Expression::Grouping { .. } => TokenType::Unknown,
+    //         Expression::Literal { literaltype, .. } => literaltype.clone(),
+    //         Expression::List { literaltype, .. } => literaltype.clone(),
+    //         Expression::Map { literaltype, .. } => literaltype.clone(),
+    //         Expression::Variable { var_type, .. } => var_type.clone(),
+    //         Expression::FunctionCall { .. } => TokenType::Unknown,
+    //         Expression::Stop { .. } => TokenType::Unknown,
+    //         Expression::NamedParameter { .. } => TokenType::Unknown,
+    //         Expression::MapGet { .. } => TokenType::Unknown,
+    //         Expression::ListGet { .. } => TokenType::Unknown,
+    //     }
+    // }
 }

src/bytecode_compiler.rs

@@ -1,7 +1,7 @@
 use crate::ast_compiler::Expression::NamedParameter;
-use crate::ast_compiler::{Expression, Function, Parameter, Statement};
+use crate::ast_compiler::{Expression, Function, Statement};
 use crate::chunk::Chunk;
-use crate::errors::{CompilerError, CompilerErrorAtLine, RuntimeError};
+use crate::errors::{CompilerError, CompilerErrorAtLine};
 use crate::symbol_builder::{Symbol, calculate_type, infer_type};
 use crate::tokens::TokenType;
 use crate::tokens::TokenType::Unknown;
@@ -9,7 +9,8 @@ use crate::value::Value;
 use crate::vm::{
     OP_ADD, OP_AND, OP_ASSIGN, OP_BITAND, OP_BITOR, OP_BITXOR, OP_CALL, OP_CONSTANT, OP_DEF_LIST,
     OP_DEF_MAP, OP_DIVIDE, OP_EQUAL, OP_GET, OP_GREATER, OP_GREATER_EQUAL, OP_LESS, OP_LESS_EQUAL,
-    OP_MULTIPLY, OP_NEGATE, OP_NOT, OP_OR, OP_PRINT, OP_RETURN, OP_SHL, OP_SHR, OP_SUBTRACT,
+    OP_LIST_GET, OP_MULTIPLY, OP_NEGATE, OP_NOT, OP_OR, OP_PRINT, OP_RETURN, OP_SHL, OP_SHR,
+    OP_SUBTRACT,
 };
 use std::collections::HashMap;
 
@@ -292,9 +293,16 @@ impl Compiler {
                     _ => unimplemented!("binary other than plus, minus, star, slash"),
                 }
             }
-            Expression::Stop { line } => {}
+            Expression::Stop { .. } => {}
-            Expression::PathMatch { line, .. } => {}
+            // Expression::PathMatch { line, .. } => {}
-            Expression::NamedParameter { line, .. } => {}
+            NamedParameter { .. } => {}
+            Expression::ListGet { index, list} => {
+                self.compile_expression(namespace, list, symbols, registry)?;
+                self.emit_byte(OP_LIST_GET);
+                self.emit_bytes((index >> 16) as u16, *index as u16);
+            }
+            Expression::MapGet { .. } => {}
+            Expression::FieldGet { .. } => {}
         }
         Ok(())
     }

src/compiler_tests.rs

@@ -2,7 +2,7 @@
 mod tests {
     use crate::value::Value;
     use crate::{compile, run};
-    use chrono::{DateTime, FixedOffset, NaiveDate, TimeZone};
+    use chrono::{DateTime};
 
     #[test]
     fn literal_int() {
@@ -35,6 +35,17 @@ mod tests {
         );
     }
 
+    #[test]
+    fn index_in_list_literal() {
+        assert_eq!(run(r#"["abc","def"][0]"#), Ok(Value::String("abc".into())))
+    }
+
+    #[test]
+    fn index_in_list_as_var() {
+        assert_eq!(run(r#"let a:list = ["abc","def"]
+a[1]"#), Ok(Value::String("def".into())))
+    }
+
     #[test]
     fn infer_type() {
         assert_eq!(
@@ -209,11 +220,21 @@ m"#);
             run(r#"let date:datetime = d"2025-11-09 16:44:28.000 +0100"
 date"#),
             Ok(Value::DateTime(
-                 DateTime::parse_from_str("2025-11-09 16:44:28.000 +0100", "%Y-%m-%d %H:%M:%S%.3f %z").unwrap().into()
+                DateTime::parse_from_str(
+                    "2025-11-09 16:44:28.000 +0100",
+                    "%Y-%m-%d %H:%M:%S%.3f %z"
+                )
+                .unwrap()
+                .into()
             ))
         );
     }
 
+    // #[test]
+    // fn string_reverse(){
+    //     assert_eq!(run(r#""abc".reverse()"#), Ok(Value::String("cba".into())));
+    // }
+
     // #[test]
     // fn package() {
     //     assert_eq!(run(r#"a.b.c()"#), Ok(Value::U32(48)));

src/errors.rs

@@ -1,5 +1,5 @@
+use crate::tokens::TokenType;
 use std::fmt::Display;
-use crate::tokens::{Token, TokenType};
 use thiserror::Error;
 
 #[derive(Error, Debug, PartialEq)]
@@ -64,7 +64,11 @@ pub enum CompilerError {
     #[error("Crud does not support numbers above 2^64")]
     Overflow,
     #[error("Undeclared function: '{0}'")]
-    FunctionNotFound(String)
+    FunctionNotFound(String),
+    #[error("Illegal argument: '{0}' cannot be used as an index into a list")]
+    IllegalIndexArgument(TokenType),
+    #[error("Illegal argument: '{0}' cannot be indexed")]
+    IllegalTypeToIndex(String),
 }
 
 #[derive(Error, Debug, PartialEq)]

src/symbol_builder.rs

@@ -75,7 +75,7 @@ pub fn build(path: &str, ast: &[Statement], symbols: &mut HashMap<String, Symbol
     }
 }
 
-pub fn add_types(
+pub fn _add_types(
     path: &str,
     ast: &[Statement],
     symbols: &mut HashMap<String, Symbol>,
@@ -225,7 +225,10 @@ pub fn infer_type(expr: &Expression, symbols: &HashMap<String, Symbol>) -> Token
             }
         }
         Expression::Stop { .. } => TokenType::Unknown,
-        Expression::PathMatch { .. } => TokenType::Unknown,
+        // Expression::PathMatch { .. } => TokenType::Unknown,
         Expression::NamedParameter { .. } => TokenType::Unknown,
+        Expression::ListGet { .. } => TokenType::Unknown,
+        Expression::MapGet { .. } => TokenType::Unknown,
+        Expression::FieldGet { .. } => TokenType::Unknown,
     }
 }

src/tokens.rs

@@ -156,7 +156,6 @@ impl fmt::Display for TokenType {
             TokenType::SingleRightArrow => write!(f, "->"),
             TokenType::Slash => write!(f, "/"),
             TokenType::Star => write!(f, "*"),
-            TokenType::DateTime => write!(f, "t\""),
             TokenType::True => write!(f, "true"),
             TokenType::Unknown => write!(f, "?"),
             TokenType::Void => write!(f, "()"),

src/vm.rs

@@ -190,6 +190,15 @@ impl Vm {
                     let value = self.local_vars.get(name_index).unwrap();
                     self.push(value.clone()); // not happy , take ownership, no clone
                 }
+                OP_LIST_GET => {
+                    let index_high = self.read(chunk);
+                    let index_low = self.read(chunk);
+                    let index = index_high <<16 + index_low;
+                    let list = self.pop();
+                    if let Value::List(list) = list {
+                        self.push(list.get(index).cloned().unwrap())
+                    }
+                }
                 OP_CALL => {
                     let function_name_index = self.read(chunk);
                     let num_args = self.read(chunk);
@@ -309,3 +318,4 @@ pub const OP_DEF_STRUCT: u16 = 38;
 pub const OP_DEF_F32: u16 = 39;
 pub const OP_DEF_F64: u16 = 40;
 pub const OP_ASSIGN: u16 = 41;
+pub const OP_LIST_GET: u16 = 42;