allow passing in parameters to functions that will be used as macros

src/lexical/token.rs

@@ -292,20 +292,38 @@ impl MacroStringLiteral {
     /// Returns the string content without escapement characters, leading and trailing double quotes.
     #[must_use]
     pub fn str_content(&self) -> String {
-        let span = self.span();
+        use std::fmt::Write;
+
+        let mut content = String::new();
+
+        for part in &self.parts {
+            match part {
+                MacroStringLiteralPart::Text(span) => {
                     let string = span.str();
-        let string = &string[1..string.len() - 1];
                     if string.contains('\\') {
-            string
+                        content += &string
                             .replace("\\n", "\n")
                             .replace("\\r", "\r")
                             .replace("\\t", "\t")
                             .replace("\\\"", "\"")
-                .replace("\\\\", "\\")
+                            .replace("\\\\", "\\");
                     } else {
-            string.to_string()
+                        content += string;
                     }
                 }
+                MacroStringLiteralPart::MacroUsage { identifier, .. } => {
+                    write!(
+                        content,
+                        "$({})",
+                        crate::transpile::util::identifier_to_macro(identifier.span.str())
+                    )
+                    .expect("can always write to string");
+                }
+            }
+        }
+
+        content
+    }
 
     /// Returns the parts that make up the macro string literal.
     #[must_use]
@@ -756,8 +774,7 @@ impl Token {
                     is_inside_macro = false;
                 } else if !encountered_open_parenthesis && character == '(' {
                     encountered_open_parenthesis = true;
-                } else if encountered_open_parenthesis
-                    && !Self::is_valid_macro_name_character(character)
+                } else if encountered_open_parenthesis && !Self::is_identifier_character(character)
                 {
                     if character == '`' {
                         return Err(UnclosedMacroUsage {
@@ -766,9 +783,7 @@ impl Token {
                         .into());
                     }
 
-                    Self::walk_iter(iter, |c| {
-                        c != ')' && !Self::is_valid_macro_name_character(c)
-                    });
+                    Self::walk_iter(iter, |c| c != ')' && !Self::is_identifier_character(c));
                     return Err(InvalidMacroNameCharacter {
                         span: Self::create_span(index, iter),
                     }
@@ -816,10 +831,6 @@ impl Token {
         }
     }
 
-    fn is_valid_macro_name_character(character: char) -> bool {
-        character.is_ascii_alphanumeric() || character == '_'
-    }
-
     /// Handles a command that is preceeded by a slash
     fn handle_command_literal(iter: &mut SourceIterator, start: usize) -> Self {
         Self::walk_iter(iter, |c| !(c.is_whitespace() && c.is_ascii_control()));

src/semantic/error.rs

@@ -241,3 +241,46 @@ impl Display for IncompatibleFunctionAnnotation {
 }
 
 impl std::error::Error for IncompatibleFunctionAnnotation {}
+
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub struct InvalidFunctionArguments {
+    pub span: Span,
+    pub expected: usize,
+    pub actual: usize,
+}
+
+impl Display for InvalidFunctionArguments {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(
+            f,
+            "{}",
+            Message::new(
+                Severity::Error,
+                format!(
+                    "Expected {} arguments, but got {}.",
+                    self.expected, self.actual
+                )
+            )
+        )?;
+
+        let help_message = if self.expected > self.actual {
+            format!(
+                "You might want to add {} more arguments.",
+                self.expected - self.actual
+            )
+        } else {
+            format!(
+                "You might want to remove {} arguments.",
+                self.actual - self.expected
+            )
+        };
+
+        write!(
+            f,
+            "\n{}",
+            SourceCodeDisplay::new(&self.span, Some(help_message))
+        )
+    }
+}
+
+impl std::error::Error for InvalidFunctionArguments {}

src/transpile/conversions.rs

@@ -70,7 +70,10 @@ impl From<&MacroStringLiteral> for MacroString {
                             MacroStringPart::String(span.str().to_string())
                         }
                         MacroStringLiteralPart::MacroUsage { identifier, .. } => {
-                            MacroStringPart::MacroUsage(identifier.span.str().to_string())
+                            MacroStringPart::MacroUsage(
+                                crate::transpile::util::identifier_to_macro(identifier.span.str())
+                                    .to_string(),
+                            )
                         }
                     })
                     .collect(),

src/transpile/error.rs

@@ -10,7 +10,7 @@ use crate::{
         log::{Message, Severity, SourceCodeDisplay},
         source_file::Span,
     },
-    semantic::error::UnexpectedExpression,
+    semantic::error::{ConflictingFunctionNames, InvalidFunctionArguments, UnexpectedExpression},
 };
 
 use super::transpiler::FunctionData;
@@ -29,6 +29,8 @@ pub enum TranspileError {
     LuaRuntimeError(#[from] LuaRuntimeError),
     #[error(transparent)]
     ConflictingFunctionNames(#[from] ConflictingFunctionNames),
+    #[error(transparent)]
+    InvalidFunctionArguments(#[from] InvalidFunctionArguments),
 }
 
 /// The result of a transpilation operation.
@@ -143,30 +145,3 @@ impl LuaRuntimeError {
         }
     }
 }
-
-#[derive(Debug, Clone, PartialEq, Eq)]
-pub struct ConflictingFunctionNames {
-    pub definition: Span,
-    pub name: String,
-}
-
-impl Display for ConflictingFunctionNames {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        write!(
-            f,
-            "{}",
-            Message::new(
-                Severity::Error,
-                format!("the following function declaration conflicts with an existing function with name `{}`", self.name)
-            )
-        )?;
-
-        write!(
-            f,
-            "\n{}",
-            SourceCodeDisplay::new(&self.definition, Option::<u8>::None)
-        )
-    }
-}
-
-impl std::error::Error for ConflictingFunctionNames {}

src/transpile/mod.rs

@@ -14,4 +14,4 @@ mod transpiler;
 #[doc(inline)]
 pub use transpiler::Transpiler;
 
-mod util;
+pub mod util;

src/transpile/transpiler.rs

@@ -14,7 +14,7 @@ use crate::{
         source_file::{SourceElement, Span},
         Handler,
     },
-    semantic::error::UnexpectedExpression,
+    semantic::error::{ConflictingFunctionNames, InvalidFunctionArguments, UnexpectedExpression},
     syntax::syntax_tree::{
         declaration::{Declaration, ImportItems},
         expression::{Expression, FunctionCall, Primary},
@@ -24,7 +24,7 @@ use crate::{
             Statement,
         },
     },
-    transpile::error::{ConflictingFunctionNames, TranspileMissingFunctionDeclaration},
+    transpile::error::TranspileMissingFunctionDeclaration,
 };
 
 use super::error::{TranspileError, TranspileResult};
@@ -103,7 +103,7 @@ impl Transpiler {
         );
 
         for identifier_span in always_transpile_functions {
-            self.get_or_transpile_function(&identifier_span, handler)?;
+            self.get_or_transpile_function(&identifier_span, None, handler)?;
         }
 
         Ok(())
@@ -221,8 +221,9 @@ impl Transpiler {
     fn get_or_transpile_function(
         &mut self,
         identifier_span: &Span,
+        arguments: Option<&[&Expression]>,
         handler: &impl Handler<base::Error>,
-    ) -> TranspileResult<String> {
+    ) -> TranspileResult<(String, Option<BTreeMap<String, String>>)> {
         let program_identifier = identifier_span.source_file().identifier();
         let program_query = (
             program_identifier.to_string(),
@@ -337,6 +338,30 @@ impl Transpiler {
             );
         }
 
+        let parameters = {
+            let functions = self.functions.read().unwrap();
+            let function_data = functions
+                .get(&program_query)
+                .or_else(|| {
+                    alias_query
+                        .clone()
+                        .and_then(|q| functions.get(&q).filter(|f| f.public))
+                })
+                .ok_or_else(|| {
+                    let error = TranspileError::MissingFunctionDeclaration(
+                        TranspileMissingFunctionDeclaration::from_context(
+                            identifier_span.clone(),
+                            &functions,
+                        ),
+                    );
+                    handler.receive(error.clone());
+                    error
+                })?;
+
+            function_data.parameters.clone()
+        };
+
+        let function_location = {
             let locations = self.function_locations.read().unwrap();
             locations
                 .get(&program_query)
@@ -351,7 +376,58 @@ impl Transpiler {
                     handler.receive(error.clone());
                     error
                 })
-            .map(|(s, _)| s.to_owned())
+                .map(|(s, _)| s.to_owned())?
+        };
+
+        let arg_count = arguments.iter().flat_map(|x| x.iter()).count();
+        if arg_count != parameters.len() {
+            let err = TranspileError::InvalidFunctionArguments(InvalidFunctionArguments {
+                expected: parameters.len(),
+                actual: arg_count,
+                span: identifier_span.clone(),
+            });
+            handler.receive(err.clone());
+            Err(err)
+        } else if arg_count > 0 {
+            let mut compiled_args = Vec::new();
+            let mut errs = Vec::new();
+            for expression in arguments.iter().flat_map(|x| x.iter()) {
+                let value = match expression {
+                    Expression::Primary(Primary::FunctionCall(func)) => self
+                        .transpile_function_call(func, handler)
+                        .map(|cmd| match cmd {
+                            Command::Raw(s) => s,
+                            _ => unreachable!("Function call should always return a raw command"),
+                        }),
+                    Expression::Primary(Primary::Lua(lua)) => {
+                        lua.eval_string(handler).map(Option::unwrap_or_default)
+                    }
+                    Expression::Primary(Primary::StringLiteral(string)) => {
+                        Ok(string.str_content().to_string())
+                    }
+                    Expression::Primary(Primary::MacroStringLiteral(literal)) => {
+                        Ok(literal.str_content())
+                    }
+                };
+
+                match value {
+                    Ok(value) => {
+                        compiled_args.push(value);
+                    }
+                    Err(err) => {
+                        compiled_args.push(String::new());
+                        errs.push(err.clone());
+                    }
+                }
+            }
+            if let Some(err) = errs.first() {
+                return Err(err.clone());
+            }
+            let function_args = parameters.into_iter().zip(compiled_args).collect();
+            Ok((function_location, Some(function_args)))
+        } else {
+            Ok((function_location, None))
+        }
     }
 
     fn transpile_function(
@@ -456,8 +532,30 @@ impl Transpiler {
         func: &FunctionCall,
         handler: &impl Handler<base::Error>,
     ) -> TranspileResult<Command> {
-        let location = self.get_or_transpile_function(&func.identifier().span, handler)?;
-        Ok(Command::Raw(format!("function {location}")))
+        let arguments = func.arguments().as_ref().map(|l| {
+            l.elements()
+                .map(derive_more::Deref::deref)
+                .collect::<Vec<_>>()
+        });
+        let (location, arguments) =
+            self.get_or_transpile_function(&func.identifier().span, arguments.as_deref(), handler)?;
+        let mut function_call = format!("function {location}");
+        if let Some(arguments) = arguments {
+            use std::fmt::Write;
+            let arguments = arguments
+                .iter()
+                .map(|(ident, v)| {
+                    format!(
+                        r#"{macro_name}:"{escaped}""#,
+                        macro_name = super::util::identifier_to_macro(ident),
+                        escaped = super::util::escape_str(v)
+                    )
+                })
+                .collect::<Vec<_>>()
+                .join(",");
+            write!(function_call, " {{{arguments}}}").unwrap();
+        }
+        Ok(Command::Raw(function_call))
     }
 
     fn transpile_execute_block(

src/transpile/util.rs

@@ -1,3 +1,8 @@
+//! Utility methods for transpiling
+
+use chksum_md5 as md5;
+use std::borrow::Cow;
+
 fn normalize_program_identifier<S>(identifier: S) -> String
 where
     S: AsRef<str>,
@@ -19,6 +24,8 @@ where
         .join("/")
 }
 
+/// Calculate the identifier to import the function based on the current identifier and the import path
+#[must_use]
 pub fn calculate_import_identifier<S, T>(current_identifier: S, import_path: T) -> String
 where
     S: AsRef<str>,
@@ -32,3 +39,53 @@ where
         normalize_program_identifier(identifier_elements.join("/") + "/" + import_path.as_ref())
     }
 }
+
+/// Escapes `"` and `\` in a string.
+#[must_use]
+pub fn escape_str(s: &str) -> Cow<str> {
+    if s.contains('"') || s.contains('\\') {
+        let mut escaped = String::with_capacity(s.len());
+        for c in s.chars() {
+            match c {
+                '"' => escaped.push_str("\\\""),
+                '\\' => escaped.push_str("\\\\"),
+                _ => escaped.push(c),
+            }
+        }
+        Cow::Owned(escaped)
+    } else {
+        Cow::Borrowed(s)
+    }
+}
+
+/// Transforms an identifier to a macro name that only contains `a-zA-Z0-9_`.
+#[must_use]
+pub fn identifier_to_macro(ident: &str) -> Cow<str> {
+    if ident
+        .chars()
+        .any(|c| !(c == '_' && c.is_ascii_alphanumeric()))
+    {
+        let new_ident = ident
+            .chars()
+            .filter(|c| *c == '_' || c.is_ascii_alphanumeric())
+            .collect::<String>();
+
+        let chksum = md5::hash(ident).to_hex_lowercase();
+
+        Cow::Owned(new_ident + "_" + &chksum[..8])
+    } else {
+        Cow::Borrowed(ident)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_escape_str() {
+        assert_eq!(escape_str("Hello, world!"), "Hello, world!");
+        assert_eq!(escape_str(r#"Hello, "world"!"#), r#"Hello, \"world\"!"#);
+        assert_eq!(escape_str(r"Hello, \world\!"), r"Hello, \\world\\!");
+    }
+}