feat(trixy-lang_parser): Add type checking (2nd stage parsing)

trixy/trixy-lang_parser/example/failing_types.tri

@@ -0,0 +1,10 @@
+struct Callback {
+    func: Function,
+    timeout: Integer,
+};
+
+fn execute_callback(callback: Name);
+
+
+// That's a flat out lie, but it results in a rather nice syntax highlight compared to nothing:
+// vim: syntax=rust

trixy/trixy-lang_parser/example/full.tri

@@ -2,7 +2,7 @@
 // HACK(@soispha): The stdlib Lua `print()` function has stdout as output hardcoded,
 // redirecting stdout seems too much like a hack thus we are just redefining the print function
 // to output to a controlled output.  <2023-09-09>
-fn print(input: CommandTransferValue);
+//fn print(input: CommandTransferValue);
 
 nasp trinitrix {
     /// Language specific functions, which mirror the `trinitrix.api` namespace.
@@ -14,11 +14,21 @@ nasp trinitrix {
 
     /// Debug only functions, these are effectively useless
     nasp debug {
+        enum UserGreet {
+            Friendly,
+            Angrily,
+            Hastly
+        };
+        struct GreetedUser {
+            names: Vec<String>,
+            new: GreetedUser,
+            state: UserGreet
+        };
         /// Greets the user
         fn greet(input: String) -> String;
 
         /// Returns a table of greeted users
-        fn greet_multiple() -> Table;
+        fn greet_multiple() -> GreetedUser;
     }
 
     /// General API to change stuff in Trinitrix

trixy/trixy-lang_parser/src/command_spec/checked.rs

@@ -1,29 +1,92 @@
 //! This module contains the already type checked types.
-//!
-//!
 
-use crate::lexing::{Keyword, TokenKind};
-pub enum PrimitiveTypes {
-    String,
-    /// Nothing
-    Void,
+use std::fmt::Display;
+
+use crate::lexing::TokenKind;
+
+/// These are the "primitive" types used in trixy, you can use any of them to create new structures
+pub const BASE_TYPES: [ConstIdentifier; 8] = [
+    Identifier::from("Integer"),
+    Identifier::from("Float"),
+    Identifier::from("Decimal"),
+    Identifier::from("String"),
+    Identifier::from("Function"),
+    Identifier::from("Option"),
+    Identifier::from("Result"),
+    Identifier::from("Vec"),
+];
+
+#[derive(Debug, PartialEq, Eq, PartialOrd, Ord)]
+pub struct Namespace {
+    pub name: Identifier,
+
+    pub functions: Vec<Function>,
+    pub structures: Vec<Structure>,
+    pub enumerations: Vec<Enumeration>,
+    pub namespaces: Vec<Namespace>,
+}
+
+#[derive(Debug, PartialEq, Eq, PartialOrd, Ord)]
+pub struct CommandSpec {
+    pub structures: Vec<Structure>,
+    pub enumerations: Vec<Enumeration>,
+    pub functions: Vec<Function>,
+    pub namespaces: Vec<Namespace>,
+}
+
+impl From<Namespace> for CommandSpec {
+    fn from(value: Namespace) -> Self {
+        Self {
+            structures: value.structures,
+            enumerations: value.enumerations,
+            functions: value.functions,
+            namespaces: value.namespaces,
+        }
+    }
+}
+
+#[derive(Debug, PartialEq, Eq, PartialOrd, Ord)]
+pub struct Structure {
+    pub identifier: Identifier,
+    pub contents: Vec<NamedType>,
+}
+
+#[derive(Debug, PartialEq, Eq, PartialOrd, Ord)]
+pub struct Enumeration {
+    pub identifier: Identifier,
+    pub states: Vec<Identifier>,
+}
+
+#[derive(Debug, PartialEq, Eq, PartialOrd, Ord)]
+pub struct Function {
+    pub identifier: Identifier,
+    pub inputs: Vec<NamedType>,
+    pub output: Option<Type>,
+}
+
+#[derive(Debug, PartialEq, Eq, PartialOrd, Ord)]
+pub struct Type {
+    pub identifier: Identifier,
+    pub generic_args: Vec<Type>,
+}
+
+#[derive(Debug, PartialEq, Eq, PartialOrd, Ord)]
+pub struct NamedType {
+    pub name: Identifier,
+    pub r#type: Type,
 }
 
 impl From<TokenKind> for Identifier {
     fn from(value: TokenKind) -> Self {
         match value {
-            TokenKind::Identifier(ident) => Identifier(ident),
-            TokenKind::Keyword(_)
-            | TokenKind::Colon
-            | TokenKind::Semicolon
-            | TokenKind::Comma
-            | TokenKind::Arrow
-            | TokenKind::BraceOpen
-            | TokenKind::BraceClose
-            | TokenKind::ParenOpen
-            | TokenKind::Dummy
-            | TokenKind::ParenClose => {
-                panic!("Tried to convert a non Identifier TokenKind to a Identefier. This is a bug")
+            TokenKind::Identifier(ident) => Identifier { name: ident },
+            _ => {
+                panic!(
+                    "Tried to convert a non Identifier TokenKind to a Identefier. This is a bug
+                Token was: '{}'
+                ",
+                    value
+                )
             }
         }
     }
@@ -34,25 +97,26 @@ impl From<TokenKind> for Identifier {
 ///     - Variable names
 ///     - Function names
 ///     - Namespace names
-#[derive(Debug, PartialEq, Eq, PartialOrd, Ord)]
-pub struct Identifier(String);
+///     - Type names
+#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Clone)]
+pub struct Identifier {
+    pub name: String,
+}
 
-impl From<TokenKind> for Keyword {
-    fn from(value: TokenKind) -> Self {
-        match value {
-            TokenKind::Keyword(keyword) => keyword,
-            TokenKind::Identifier(_)
-            | TokenKind::Colon
-            | TokenKind::Semicolon
-            | TokenKind::Comma
-            | TokenKind::Arrow
-            | TokenKind::BraceOpen
-            | TokenKind::BraceClose
-            | TokenKind::ParenOpen
-            | TokenKind::Dummy
-            | TokenKind::ParenClose => {
-                panic!("Tried to convert a non Keyword TokenKind to a Keyword. This is a bug")
-            }
-        }
+/// A const version of [Identifier]
+#[derive(Debug, PartialEq, Eq, PartialOrd, Ord)]
+pub struct ConstIdentifier {
+    pub name: &'static str,
+}
+
+impl Display for Identifier {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.write_str(&self.name)
+    }
+}
+
+impl Identifier {
+    const fn from(value: &'static str) -> ConstIdentifier {
+        ConstIdentifier { name: value }
     }
 }

trixy/trixy-lang_parser/src/command_spec/mod.rs

@@ -1,2 +1,2 @@
-// pub mod checked;
+pub mod checked;
 pub mod unchecked;

trixy/trixy-lang_parser/src/command_spec/unchecked.rs

@@ -2,82 +2,101 @@
 //! These are generated on the first pass of the parser, to be later converted into the checked
 //! ones.
 
+use std::fmt::{Display, Write};
+
 use crate::lexing::Token;
 
-#[derive(Debug, PartialEq, Eq, PartialOrd, Ord)]
+#[derive(Debug, Default, PartialEq, Eq, PartialOrd, Ord)]
 pub struct CommandSpec {
-    pub declarations: Vec<Declaration>,
+    pub structures: Vec<Structure>,
+    pub enumerations: Vec<Enumeration>,
+    pub functions: Vec<Function>,
+    pub namespaces: Vec<Namespace>,
 }
 
-#[derive(Debug, PartialEq, Eq, PartialOrd, Ord)]
-pub struct Declaration {
-    pub namespace: Vec<Token>, // Will later be turned into Namespace
-    pub genus: Genus,
-}
-
-impl Declaration {
-    pub fn new_function(function: Function, namespace: Vec<Token>) -> Self {
-        Declaration {
-            namespace,
-            genus: Genus::Function(function),
-        }
-    }
-    pub fn new_structure(structure: Structure, namespace: Vec<Token>) -> Self {
-        Declaration {
-            namespace,
-            genus: Genus::Structure(structure),
-        }
-    }
-    pub fn new_enumeration(r#enum: Enumeration, namespace: Vec<Token>) -> Self {
-        Declaration {
-            namespace,
-            genus: Genus::Enumeration(r#enum),
+impl From<CommandSpec> for Namespace {
+    fn from(value: CommandSpec) -> Self {
+        Self {
+            name: Token::get_dummy(),
+            functions: value.functions,
+            structures: value.structures,
+            enumerations: value.enumerations,
+            namespaces: value.namespaces,
         }
     }
 }
 
-#[derive(Debug, PartialEq, Eq, PartialOrd, Ord)]
+#[derive(Debug, Default, PartialEq, Eq, PartialOrd, Ord, Clone)]
 pub struct Namespace {
     pub name: Token, // Will later become an Identifier
+
+    pub functions: Vec<Function>,
+    pub structures: Vec<Structure>,
+    pub enumerations: Vec<Enumeration>,
+    pub namespaces: Vec<Namespace>,
 }
 
 #[derive(Debug, PartialEq, Eq, PartialOrd, Ord)]
-pub enum Genus {
-    /// Not actually a genus, but used in parsing to accommodate multiple errors
-    Dummy,
-    /// A function
+pub enum Declaration {
     Function(Function),
     Structure(Structure),
     Enumeration(Enumeration),
+    Namespace(Namespace),
 }
 
-#[derive(Debug, PartialEq, Eq, PartialOrd, Ord)]
+#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Clone)]
 pub struct Function {
     pub identifier: Token, // Will later become an Identifier
     pub inputs: Vec<NamedType>,
     pub output: Option<Type>,
 }
 
-#[derive(Debug, PartialEq, Eq, PartialOrd, Ord)]
+#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Clone)]
 pub struct Structure {
     pub identifier: Token, // Will later become an Identifier
     pub contents: Vec<NamedType>,
 }
 
-#[derive(Debug, PartialEq, Eq, PartialOrd, Ord)]
+#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Clone)]
 pub struct Enumeration {
     pub identifier: Token,  // Will later become an Identifier
     pub states: Vec<Token>, // Will later become an Identifier
 }
 
-#[derive(Debug, PartialEq, Eq, PartialOrd, Ord)]
+#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Clone)]
 pub struct NamedType {
     pub name: Token, // Will later become an Identifier
     pub r#type: Type,
 }
 
-#[derive(Debug, PartialEq, Eq, PartialOrd, Ord)]
+#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Clone)]
 pub struct Type {
     pub identifier: Token, // Will later become an Identifier
     pub generic_args: Vec<Type>,
 }
+
+impl Display for Type {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        let ident = match self.identifier.kind() {
+            crate::lexing::TokenKind::Identifier(ident) => ident,
+            _ => panic!("Tried to display a non identifier token in the Type display implementation. This is a bug"),
+        };
+
+        f.write_str(ident)?;
+        if !self.generic_args.is_empty() {
+            f.write_char('<')?;
+            let mut first_run = true;
+            for arg in &self.generic_args {
+                if !first_run {
+                    f.write_str(", ")?;
+                } else {
+                    first_run = false;
+                }
+                write!(f, "{}", arg)?;
+            }
+            f.write_char('>')
+        } else {
+            f.write_str("")
+        }
+    }
+}

trixy/trixy-lang_parser/src/error.rs

@@ -11,7 +11,7 @@ pub enum TrixyError {
 }
 
 /// The context of an Error.
-#[derive(Debug)]
+#[derive(Debug, Clone)]
 pub struct ErrorContext {
     /// The span of the error in the source file
     pub span: TokenSpan,

trixy/trixy-lang_parser/src/lexing/mod.rs

@@ -72,7 +72,7 @@ impl TokenStream {
 /// }
 /// ```
 /// signals, that the token starts at the 20th char in the source file and ends on the 23rd.
-#[derive(Debug, PartialEq, PartialOrd, Ord, Eq, Clone, Copy)]
+#[derive(Debug, Default, PartialEq, PartialOrd, Ord, Eq, Clone, Copy)]
 pub struct TokenSpan {
     /// The start of the token span
     pub start: usize,
@@ -81,7 +81,7 @@ pub struct TokenSpan {
 }
 
 /// A Token
-#[derive(Debug, PartialEq, PartialOrd, Ord, Eq, Clone)]
+#[derive(Debug, Default, PartialEq, PartialOrd, Ord, Eq, Clone)]
 pub struct Token {
     /// The token's original location in the source file
     pub span: TokenSpan,
@@ -109,7 +109,7 @@ impl Token {
 }
 
 /// Possibly kinds of tokens
-#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Clone)]
+#[derive(Debug, Default, PartialEq, Eq, PartialOrd, Ord, Clone)]
 pub enum TokenKind {
     Keyword(Keyword),
     Identifier(String),
@@ -124,6 +124,7 @@ pub enum TokenKind {
     SquareOpen,
     SquareClose,
     /// This is not a real TokenKind, but only used for error handling
+    #[default]
     Dummy,
 }
 

trixy/trixy-lang_parser/src/main.rs

@@ -23,11 +23,18 @@ pub enum Command {
         /// The file containing the trixy code to tokenize
         file: PathBuf,
     },
+    /// Check syntax, without type checking
     Parse {
         #[clap(value_parser)]
         /// The file containing the trixy code to parse
         file: PathBuf,
     },
+    /// Type check
+    Process {
+        #[clap(value_parser)]
+        /// The file containing the trixy code to process
+        file: PathBuf,
+    },
 }
 
 pub fn main() {
@@ -68,5 +75,36 @@ pub fn main() {
             };
             println!("{:#?}", parsed);
         }
+        Command::Process { file } => {
+            let input = fs::read_to_string(file).unwrap();
+
+            let input_tokens = match TokenStream::lex(&input) {
+                Ok(ok) => ok,
+                Err(err) => {
+                    eprintln!("Error while tokenizing:");
+                    eprintln!("{}", err);
+                    exit(1);
+                }
+            };
+
+            let parsed = match input_tokens.parse_unchecked() {
+                Ok(ok) => ok,
+                Err(err) => {
+                    eprintln!("Error while doing the first (unchecked) parsing run:");
+                    eprintln!("{}", err);
+                    exit(1)
+                }
+            };
+
+            let processed = match parsed.process(input) {
+                Ok(ok) => ok,
+                Err(err) => {
+                    eprintln!("Error while doing the seconde (checked) parsing run:");
+                    eprintln!("{}", err);
+                    exit(1)
+                }
+            };
+            println!("{:#?}", processed);
+        },
     }
 }

trixy/trixy-lang_parser/src/parsing/checked/error.rs

@@ -0,0 +1,82 @@
+use thiserror::Error;
+
+use std::{error::Error, fmt::Display};
+
+use crate::{
+    command_spec::checked::Identifier,
+    error::{AdditionalHelp, ErrorContext, ErrorContextDisplay},
+    lexing::TokenSpan,
+    parsing::unchecked::error::SpannedParsingError as OldSpannedParsingError,
+};
+
+#[derive(Error, Debug)]
+pub enum ParsingError {
+    #[error("The type ('{r#type}') was not declared before!")]
+    TypeNotDeclared { r#type: Identifier, span: TokenSpan },
+    #[error(transparent)]
+    PreParseError(#[from] OldSpannedParsingError),
+}
+
+impl ParsingError {
+    pub fn span(&self) -> &TokenSpan {
+        match self {
+            ParsingError::TypeNotDeclared { span, .. } => span,
+            ParsingError::PreParseError(err) => err.source.span(),
+        }
+    }
+}
+
+impl AdditionalHelp for ParsingError {
+    fn additional_help(&self) -> String {
+        match self {
+            ParsingError::TypeNotDeclared { .. } => "This type should have been mentioned in the namespaces above, or in the namespace of this type usage".to_owned(),
+            ParsingError::PreParseError(err) => ErrorContextDisplay::source(err).additional_help(),
+        }
+    }
+}
+
+#[derive(Debug)]
+pub struct SpannedParsingError {
+    pub source: ParsingError,
+    pub context: ErrorContext,
+}
+
+impl Error for SpannedParsingError {
+    fn source(&self) -> Option<&(dyn Error + 'static)> {
+        Some(&self.source)
+    }
+}
+
+impl Display for SpannedParsingError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        self.error_fmt(f)
+    }
+}
+
+impl ErrorContextDisplay for SpannedParsingError {
+    type Error = ParsingError;
+
+    fn context(&self) -> &crate::error::ErrorContext {
+        &self.context
+    }
+
+    fn line_number(&self) -> usize {
+        self.context.line_number
+    }
+
+    fn line_above(&self) -> &str {
+        &self.context.line_above
+    }
+
+    fn line_below(&self) -> &str {
+        &self.context.line_below
+    }
+
+    fn line(&self) -> &str {
+        &self.context.line
+    }
+
+    fn source(&self) -> &<SpannedParsingError as ErrorContextDisplay>::Error {
+        &self.source
+    }
+}

trixy/trixy-lang_parser/src/parsing/checked/mod.rs

@@ -0,0 +1,230 @@
+use std::mem;
+
+use crate::{
+    command_spec::{
+        checked::{
+            CommandSpec, Enumeration, Function, Identifier, NamedType, Namespace, Structure, Type,
+            BASE_TYPES,
+        },
+        unchecked::{
+            CommandSpec as UncheckedCommandSpec, Enumeration as UncheckedEnumeration,
+            Function as UncheckedFunction, NamedType as UncheckedNamedType,
+            Namespace as UncheckedNamespace, Structure as UncheckedStructure,
+            Type as UncheckedType,
+        },
+    },
+    error::ErrorContext,
+    lexing::{TokenKind, TokenStream},
+};
+
+use self::error::{ParsingError, SpannedParsingError};
+
+mod error;
+#[cfg(test)]
+mod test;
+
+struct Parser {
+    command_spec: UncheckedCommandSpec,
+    structures: Vec<UncheckedStructure>,
+    enumerations: Vec<UncheckedEnumeration>,
+    original_file: String,
+}
+
+impl TokenStream {
+    pub fn parse(mut self) -> Result<CommandSpec, SpannedParsingError> {
+        let original_file = mem::take(&mut self.original_file);
+
+        let unchecked = self.parse_unchecked().map_err(|err| {
+            let span = *err.source.span();
+            SpannedParsingError {
+                source: ParsingError::from(err),
+                context: ErrorContext::from_span(span, &original_file),
+            }
+        })?;
+
+        let checked = Parser {
+            command_spec: unchecked,
+            structures: vec![],
+            enumerations: vec![],
+            original_file,
+        }
+        .parse()?;
+        Ok(checked)
+    }
+}
+
+impl UncheckedCommandSpec {
+    pub fn process(self, original_file: String) -> Result<CommandSpec, SpannedParsingError> {
+        let checked = Parser {
+            command_spec: self,
+            structures: vec![],
+            enumerations: vec![],
+            original_file,
+        }
+        .parse()?;
+        Ok(checked)
+    }
+}
+
+impl Parser {
+    fn parse(mut self) -> Result<CommandSpec, SpannedParsingError> {
+        let namespace: UncheckedNamespace =
+            UncheckedNamespace::from(mem::take(&mut self.command_spec));
+        let namespace = self.process_namespace(namespace).map_err(|err| {
+            let span = *err.span();
+            SpannedParsingError {
+                source: err,
+                context: ErrorContext::from_span(span, &self.original_file),
+            }
+        })?;
+        Ok(namespace.into())
+    }
+
+    fn process_namespace(
+        &mut self,
+        namespace: UncheckedNamespace,
+    ) -> Result<Namespace, ParsingError> {
+        let name = match namespace.name.kind {
+            TokenKind::Identifier(ident) => Identifier { name: ident },
+            // This is not really used, so the value put here does not matter
+            TokenKind::Dummy => Identifier {
+                name: "".to_owned(),
+            },
+            _ => unreachable!("This should never be more than these two enum veriants"),
+        };
+
+        let mut enumerations = vec![];
+        let mut enumerations_counter = 0;
+        for enumeration in namespace.enumerations {
+            enumerations.push(self.process_enumeration(enumeration)?);
+            enumerations_counter += 1;
+        }
+        let mut structures = vec![];
+        let mut structures_counter = 0;
+        for structure in namespace.structures {
+            structures.push(self.process_structure(structure)?);
+            structures_counter += 1;
+        }
+
+        let mut functions = vec![];
+        for function in namespace.functions {
+            functions.push(self.process_function(function)?);
+        }
+        let mut namespaces = vec![];
+        for namespace in namespace.namespaces {
+            namespaces.push(self.process_namespace(namespace)?);
+        }
+
+        // Remove added enums and structs again
+        (0..structures_counter).for_each(|_| {
+            self.structures.pop();
+        });
+        (0..enumerations_counter).for_each(|_| {
+            self.enumerations.pop();
+        });
+
+        Ok(Namespace {
+            name,
+            functions,
+            structures,
+            enumerations,
+            namespaces,
+        })
+    }
+
+    fn process_function(
+        &mut self,
+        mut function: UncheckedFunction,
+    ) -> Result<Function, ParsingError> {
+        let identifier = mem::take(&mut function.identifier.kind).into();
+        let mut inputs = vec![];
+        for input in function.inputs {
+            inputs.push(self.process_named_type(input)?);
+        }
+        let output = if let Some(r#type) = function.output {
+            Some(self.process_type(r#type)?)
+        } else {
+            None
+        };
+
+        Ok(Function {
+            identifier,
+            inputs,
+            output,
+        })
+    }
+
+    fn process_enumeration(
+        &mut self,
+        mut enumeration: UncheckedEnumeration,
+    ) -> Result<Enumeration, ParsingError> {
+        self.enumerations.push(enumeration.clone());
+
+        let identifier = mem::take(&mut enumeration.identifier.kind).into();
+
+        let mut states = vec![];
+        for mut state in enumeration.states {
+            states.push(mem::take(&mut state.kind).into())
+        }
+
+        Ok(Enumeration { identifier, states })
+    }
+
+    fn process_structure(
+        &mut self,
+        mut structure: UncheckedStructure,
+    ) -> Result<Structure, ParsingError> {
+        self.structures.push(structure.clone());
+
+        let identifier: Identifier = mem::take(&mut structure.identifier.kind).into();
+        let mut contents = vec![];
+        for named_type in structure.contents {
+            contents.push(self.process_named_type(named_type)?);
+        }
+
+        Ok(Structure {
+            identifier,
+            contents,
+        })
+    }
+
+    fn process_named_type(
+        &mut self,
+        mut named_type: UncheckedNamedType,
+    ) -> Result<NamedType, ParsingError> {
+        let name: Identifier = mem::take(&mut named_type.name.kind).into();
+        let r#type: Type = self.process_type(named_type.r#type)?;
+        Ok(NamedType { name, r#type })
+    }
+
+    fn process_type(&mut self, mut r#type: UncheckedType) -> Result<Type, ParsingError> {
+        let identifier: Identifier = mem::take(&mut r#type.identifier.kind).into();
+
+        if !self
+            .structures
+            .iter()
+            .map(|r#struct| Into::<Identifier>::into(r#struct.identifier.kind.clone()))
+            .any(|ident| ident == identifier)
+            && !self
+                .enumerations
+                .iter()
+                .map(|r#enum| Into::<Identifier>::into(r#enum.identifier.kind.clone()))
+                .any(|ident| ident == identifier)
+            && !BASE_TYPES.iter().any(|ident| ident.name == identifier.name)
+        {
+            return Err(ParsingError::TypeNotDeclared {
+                r#type: identifier,
+                span: r#type.identifier.span,
+            });
+        }
+
+        let mut generic_args = vec![];
+        for generic_arg in r#type.generic_args {
+            generic_args.push(self.process_type(generic_arg)?);
+        }
+        Ok(Type {
+            identifier,
+            generic_args,
+        })
+    }
+}

trixy/trixy-lang_parser/src/parsing/checked/test.rs

@@ -0,0 +1,134 @@
+use crate::command_spec::checked::{
+    CommandSpec, Enumeration, Function, Identifier, NamedType, Namespace, Structure, Type,
+};
+use crate::lexing::TokenStream;
+
+#[test]
+fn test_full() {
+    let input = "nasp trinitrix {
+    struct Callback {
+        func: Function,
+        timeout: Integer,
+    };
+
+    enum CallbackPriority {
+        High,
+        Medium,
+        Low,
+    };
+
+    fn execute_callback(callback: Callback, priority: CallbackPriority);
+}";
+    let output = TokenStream::lex(&input).unwrap().parse().unwrap();
+    let expected = CommandSpec {
+        structures: vec![],
+        enumerations: vec![],
+        functions: vec![],
+        namespaces: vec![Namespace {
+            name: Identifier {
+                name: "trinitrix".to_owned(),
+            },
+            functions: vec![Function {
+                identifier: Identifier {
+                    name: "execute_callback".to_owned(),
+                },
+                inputs: vec![
+                    NamedType {
+                        name: Identifier {
+                            name: "callback".to_owned(),
+                        },
+                        r#type: Type {
+                            identifier: Identifier {
+                                name: "Callback".to_owned(),
+                            },
+                            generic_args: vec![],
+                        },
+                    },
+                    NamedType {
+                        name: Identifier {
+                            name: "priority".to_owned(),
+                        },
+                        r#type: Type {
+                            identifier: Identifier {
+                                name: "CallbackPriority".to_owned(),
+                            },
+                            generic_args: vec![],
+                        },
+                    },
+                ],
+                output: None,
+            }],
+            structures: vec![Structure {
+                identifier: Identifier {
+                    name: "Callback".to_owned(),
+                },
+                contents: vec![
+                    NamedType {
+                        name: Identifier {
+                            name: "func".to_owned(),
+                        },
+                        r#type: Type {
+                            identifier: Identifier {
+                                name: "Function".to_owned(),
+                            },
+                            generic_args: vec![],
+                        },
+                    },
+                    NamedType {
+                        name: Identifier {
+                            name: "timeout".to_owned(),
+                        },
+                        r#type: Type {
+                            identifier: Identifier {
+                                name: "Integer".to_owned(),
+                            },
+                            generic_args: vec![],
+                        },
+                    },
+                ],
+            }],
+            enumerations: vec![Enumeration {
+                identifier: Identifier {
+                    name: "CallbackPriority".to_owned(),
+                },
+                states: vec![
+                    Identifier {
+                        name: "High".to_owned(),
+                    },
+                    Identifier {
+                        name: "Medium".to_owned(),
+                    },
+                    Identifier {
+                        name: "Low".to_owned(),
+                    },
+                ],
+            }],
+            namespaces: vec![],
+        }],
+    };
+    assert_eq!(output, expected);
+}
+
+#[test]
+fn test_failing() {
+    let input = "struct Callback {
+    func: Function,
+    timeout: Integer,
+};
+
+// The type \"Name\" should not be defined
+fn execute_callback(callback: Name);
+";
+    let output = TokenStream::lex(&input).unwrap().parse();
+    match output.unwrap_err().source {
+        super::error::ParsingError::TypeNotDeclared { r#type, .. } => {
+            assert_eq!(
+                r#type,
+                Identifier {
+                    name: "Name".to_owned()
+                }
+            )
+        }
+        _ => panic!("Wrong error in test!"),
+    };
+}

trixy/trixy-lang_parser/src/parsing/mod.rs

@@ -1,4 +1,2 @@
-mod error;
 mod unchecked;
-#[cfg(test)]
-mod test;
+mod checked;

trixy/trixy-lang_parser/src/parsing/test.rs

@@ -1,88 +0,0 @@
-use crate::{
-    command_spec::unchecked::{CommandSpec, Declaration, Function, FunctionInput, Genus},
-    lexing::{Token, TokenKind, TokenSpan, TokenStream},
-};
-
-use super::error::ParsingError;
-
-use pretty_assertions::assert_eq;
-
-#[test]
-fn test_failing() {
-    let input = "
-fn print(message: CommandTransferValue);
-
-nasp trinitrix { {}
-    fn hi honner(name: String) -> String; ;
-}
-
-";
-    let parsed = TokenStream::lex(input).unwrap().parse_unchecked();
-    let err = parsed.unwrap_err().source;
-    match err {
-        ParsingError::ExpectedDifferentToken { .. } => panic!("Wrong error"),
-        ParsingError::ExpectedKeyword { .. } => {}
-    }
-}
-
-#[test]
-fn test_full() {
-    let input = "fn print(message: CommandTransferValue);
-
-nasp trinitrix {
-    fn hi(name: String) -> String;
-}
-";
-    let parsed = TokenStream::lex(input).unwrap().parse_unchecked().unwrap();
-    let expected = CommandSpec {
-        declarations: vec![
-            Declaration {
-                namespace: vec![],
-                genus: Genus::Function(Function {
-                    identifier: Token {
-                        span: TokenSpan { start: 3, end: 8 },
-                        kind: TokenKind::Identifier("print".to_owned()),
-                    },
-                    inputs: vec![FunctionInput {
-                        name: Token {
-                            span: TokenSpan { start: 9, end: 16 },
-                            kind: TokenKind::Identifier("message".to_owned()),
-                        },
-                        r#type: Token {
-                            span: TokenSpan { start: 18, end: 38 },
-                            kind: TokenKind::Identifier("CommandTransferValue".to_owned()),
-                        },
-                    }],
-                    output: None,
-                }),
-            },
-            Declaration {
-                namespace: vec![Token {
-                    span: TokenSpan { start: 47, end: 56 },
-                    kind: TokenKind::Identifier("trinitrix".to_owned()),
-                }],
-                genus: Genus::Function(Function {
-                    identifier: Token {
-                        span: TokenSpan { start: 66, end: 68 },
-                        kind: TokenKind::Identifier("hi".to_owned()),
-                    },
-                    inputs: vec![FunctionInput {
-                        name: Token {
-                            span: TokenSpan { start: 69, end: 73 },
-                            kind: TokenKind::Identifier("name".to_owned()),
-                        },
-                        r#type: Token {
-                            span: TokenSpan { start: 75, end: 81 },
-                            kind: TokenKind::Identifier("String".to_owned()),
-                        },
-                    }],
-                    output: Some(Token {
-                        span: TokenSpan { start: 86, end: 92 },
-                        kind: TokenKind::Identifier("String".to_owned()),
-                    }),
-                }),
-            },
-        ],
-    };
-    assert_eq!(parsed, expected);
-}

trixy/trixy-lang_parser/src/parsing/unchecked/error.rs

@@ -6,7 +6,7 @@ use crate::{
     lexing::{TokenKind, TokenSpan},
 };
 
-#[derive(Error, Debug)]
+#[derive(Error, Debug, Clone)]
 pub enum ParsingError {
     #[error("Expected '{expected}' but received '{actual}'")]
     ExpectedDifferentToken {
@@ -18,6 +18,14 @@ pub enum ParsingError {
     #[error("Expected a Keyword to start a new declaration, but found: '{actual}'")]
     ExpectedKeyword { actual: TokenKind, span: TokenSpan },
 }
+impl ParsingError {
+    pub fn span(&self) -> &TokenSpan {
+        match self {
+            ParsingError::ExpectedDifferentToken { span, .. } => span,
+            ParsingError::ExpectedKeyword { span, .. } => span,
+        }
+    }
+}
 
 impl ParsingError {
     pub fn get_span(&self) -> TokenSpan {
@@ -46,7 +54,7 @@ impl AdditionalHelp for ParsingError {
     }
 }
 
-#[derive(Debug)]
+#[derive(Debug, Clone)]
 pub struct SpannedParsingError {
     pub source: ParsingError,
     pub context: ErrorContext,

trixy/trixy-lang_parser/src/parsing/unchecked/mod.rs

@@ -1,13 +1,17 @@
 use crate::{
     command_spec::unchecked::{
-        CommandSpec, Declaration, Enumeration, Function, NamedType, Structure, Type,
+        CommandSpec, Declaration, Enumeration, Function, NamedType, Namespace, Structure, Type,
     },
     error::ErrorContext,
     lexing::{Token, TokenKind, TokenStream},
     token,
 };
 
-use super::error::{ParsingError, SpannedParsingError};
+use self::error::{ParsingError, SpannedParsingError};
+
+pub mod error;
+#[cfg(test)]
+mod test;
 
 impl TokenStream {
     pub fn parse_unchecked(self) -> Result<CommandSpec, SpannedParsingError> {
@@ -18,50 +22,41 @@ impl TokenStream {
 
 pub(super) struct Parser {
     token_stream: TokenStream,
-    current_namespaces: Vec<Token>, // This should in the second pass turn into Identifiers
 }
 
 impl Parser {
     fn new(mut token_stream: TokenStream) -> Self {
         token_stream.reverse();
-        Self {
-            token_stream,
-            current_namespaces: vec![],
-        }
+        Self { token_stream }
     }
 
     fn parse(&mut self) -> Result<CommandSpec, SpannedParsingError> {
-        let mut declarations = vec![];
+        let mut output = CommandSpec::default();
         while !self.token_stream.is_empty() {
-            let mut next = self.parse_next().map_err(|err| {
+            let next = self.parse_next().map_err(|err| {
                 let span = err.get_span();
                 SpannedParsingError {
                     source: err,
                     context: ErrorContext::from_span(span, &self.token_stream.original_file),
                 }
             })?;
-
-            declarations.append(&mut next);
+            match next {
+                Declaration::Function(function) => output.functions.push(function),
+                Declaration::Structure(structure) => output.structures.push(structure),
+                Declaration::Enumeration(enumeration) => output.enumerations.push(enumeration),
+                Declaration::Namespace(namespace) => output.namespaces.push(namespace),
+            }
         }
 
-        Ok(CommandSpec { declarations })
+        Ok(output)
     }
 
-    fn parse_next(&mut self) -> Result<Vec<Declaration>, ParsingError> {
+    fn parse_next(&mut self) -> Result<Declaration, ParsingError> {
         match self.peek().kind() {
-            token![nasp] => Ok(self.parse_namespace()?),
-            token![fn] => Ok(vec![Declaration::new_function(
-                self.parse_function()?,
-                self.current_namespaces.clone(),
-            )]),
-            token![struct] => Ok(vec![Declaration::new_structure(
-                self.parse_structure()?,
-                self.current_namespaces.clone(),
-            )]),
-            token![enum] => Ok(vec![Declaration::new_enumeration(
-                self.parse_enumeration()?,
-                self.current_namespaces.clone(),
-            )]),
+            token![nasp] => Ok(Declaration::Namespace(self.parse_namespace()?)),
+            token![fn] => Ok(Declaration::Function(self.parse_function()?)),
+            token![struct] => Ok(Declaration::Structure(self.parse_structure()?)),
+            token![enum] => Ok(Declaration::Enumeration(self.parse_enumeration()?)),
             _ => {
                 let err = ParsingError::ExpectedKeyword {
                     span: *self.peek().span(),
@@ -93,20 +88,28 @@ impl Parser {
         })
     }
 
-    fn parse_namespace(&mut self) -> Result<Vec<Declaration>, ParsingError> {
+    fn parse_namespace(&mut self) -> Result<Namespace, ParsingError> {
         self.expect(token![nasp])?;
-        let namespace_name = self.expect(token![Ident])?;
-        self.current_namespaces.push(namespace_name);
+
+        let mut namespace = Namespace::default();
+        namespace.name = self.expect(token![Ident])?;
+
         self.expect(token![BraceOpen])?;
 
-        let mut declarations = vec![];
         while !self.expect_peek(token![BraceClose]) {
-            declarations.append(&mut self.parse_next()?);
+            let next = self.parse_next()?;
+            match next {
+                Declaration::Function(function) => namespace.functions.push(function),
+                Declaration::Structure(structure) => namespace.structures.push(structure),
+                Declaration::Enumeration(enumeration) => namespace.enumerations.push(enumeration),
+                Declaration::Namespace(input_namespace) => {
+                    namespace.namespaces.push(input_namespace)
+                }
+            }
         }
 
         self.expect(token![BraceClose])?;
-        self.current_namespaces.pop();
-        Ok(declarations)
+        Ok(namespace)
     }
 
     fn parse_enumeration(&mut self) -> Result<Enumeration, ParsingError> {

trixy/trixy-lang_parser/src/parsing/unchecked/test.rs

@@ -0,0 +1,98 @@
+use pretty_assertions::assert_eq;
+
+use crate::{
+    command_spec::unchecked::{CommandSpec, Function, NamedType, Namespace, Type},
+    lexing::{Token, TokenKind, TokenSpan, TokenStream},
+};
+
+use super::error::ParsingError;
+
+#[test]
+fn test_failing() {
+    let input = "
+fn print(message: CommandTransferValue);
+
+nasp trinitrix { {}
+    fn hi honner(name: String) -> String; ;
+}
+
+";
+    let parsed = TokenStream::lex(input).unwrap().parse_unchecked();
+    let err = parsed.unwrap_err().source;
+    match err {
+        ParsingError::ExpectedDifferentToken { .. } => panic!("Wrong error"),
+        ParsingError::ExpectedKeyword { .. } => {}
+    }
+}
+
+#[test]
+fn test_full() {
+    let input = "fn print(message: CommandTransferValue);
+
+nasp trinitrix {
+    fn hi(name: String) -> String;
+}
+";
+    let parsed = TokenStream::lex(input).unwrap().parse_unchecked().unwrap();
+    let expected = CommandSpec {
+        structures: vec![],
+        enumerations: vec![],
+        functions: vec![Function {
+            identifier: Token {
+                span: TokenSpan { start: 3, end: 8 },
+                kind: TokenKind::Identifier("print".to_owned()),
+            },
+            inputs: vec![NamedType {
+                name: Token {
+                    span: TokenSpan { start: 9, end: 16 },
+                    kind: TokenKind::Identifier("message".to_owned()),
+                },
+                r#type: Type {
+                    identifier: Token {
+                        span: TokenSpan { start: 18, end: 38 },
+                        kind: TokenKind::Identifier("CommandTransferValue".to_owned()),
+                    },
+                    generic_args: vec![],
+                },
+            }],
+            output: None,
+        }],
+        namespaces: vec![Namespace {
+            name: Token {
+                span: TokenSpan { start: 47, end: 56 },
+                kind: TokenKind::Identifier("trinitrix".to_owned()),
+            },
+            functions: vec![Function {
+                identifier: Token {
+                    span: TokenSpan { start: 66, end: 68 },
+                    kind: TokenKind::Identifier("hi".to_owned()),
+                },
+                inputs: vec![NamedType {
+                    name: Token {
+                        span: TokenSpan { start: 69, end: 73 },
+                        kind: TokenKind::Identifier("name".to_owned()),
+                    },
+                    r#type: Type {
+                        identifier: Token {
+                            span: TokenSpan { start: 75, end: 81 },
+                            kind: TokenKind::Identifier("String".to_owned()),
+                        },
+                        generic_args: vec![],
+                    },
+                }],
+                output: Some(Type {
+                    identifier: Token {
+                        span: TokenSpan { start: 86, end: 92 },
+                        kind: TokenKind::Identifier("String".to_owned()),
+                    },
+                    generic_args: vec![],
+                }),
+            }],
+            structures: vec![],
+            enumerations: vec![],
+            namespaces: vec![],
+        }],
+    };
+
+    assert_eq!(parsed, expected);
+}