added macro support, syntax is !(macro-type ...), i.e. !(mers my_file.mers) or !(mers { "value to compute at compile-time".regex("\\S+").assume_no_enum() })

mers/src/libs/mod.rs

@@ -121,7 +121,10 @@ impl Lib {
                             fn_signature.next();
                         } else {
                             loop {
-                                let mut t = match parse::parse_type_adv(&mut fn_signature, true) {
+                                let mut t = match parse::implementation::parse_type_adv(
+                                    &mut fn_signature,
+                                    true,
+                                ) {
                                     Ok(v) => v,
                                     Err(e) => panic!("{e}"),
                                 };
@@ -132,7 +135,8 @@ impl Lib {
                                 }
                             }
                         }
-                        let mut fn_out = match parse::parse_type(&mut fn_signature) {
+                        let mut fn_out = match parse::implementation::parse_type(&mut fn_signature)
+                        {
                             Ok(v) => v,
                             Err(e) => panic!("{e}"),
                         };

mers/src/libs/path.rs

@@ -1,16 +1,20 @@
 use std::path::PathBuf;
 
-pub fn path_from_string(path: &str, script_directory: &PathBuf) -> Option<PathBuf> {
+pub fn path_from_string(path: &str, script_path: &PathBuf) -> Option<PathBuf> {
     let path = PathBuf::from(path);
     if path.is_absolute() {
         return Some(path);
     }
-    if let Some(p) = script_directory
+    if let Some(p) = script_path
         .canonicalize()
-        .unwrap_or_else(|_| script_directory.clone())
+        .unwrap_or_else(|_| script_path.clone())
         .parent()
     {
+        #[cfg(debug_assertions)]
+        eprintln!("path: parent path: {p:?}");
         let p = p.join(&path);
+        #[cfg(debug_assertions)]
+        eprintln!("path: joined: {p:?}");
         if p.exists() {
             return Some(p);
         }

mers/src/parse/file.rs

@@ -108,12 +108,27 @@ impl File {
     }
     pub fn skip_whitespaces(&mut self) {
         loop {
-            match self.chars.get(self.pos.current_char_index) {
+            match self.peek() {
-                Some(ch) if ch.1.is_whitespace() => _ = self.next(),
+                Some(ch) if ch.is_whitespace() => _ = self.next(),
                 _ => break,
             }
         }
     }
+    pub fn collect_to_whitespace(&mut self) -> String {
+        let mut o = String::new();
+        loop {
+            if let Some(ch) = self.next() {
+                if ch.is_whitespace() {
+                    self.set_pos(*self.get_ppos());
+                    break;
+                }
+                o.push(ch);
+            } else {
+                break;
+            }
+        }
+        o
+    }
     pub fn path(&self) -> &PathBuf {
         &self.path
     }

mers/src/parse/parse.rs

@@ -3,6 +3,7 @@ use std::{process::Command, sync::Arc};
 use crate::{
     libs,
     script::{
+        code_macro::MacroError,
         code_parsed::*,
         code_runnable::RScript,
         global_info::GSInfo,
@@ -239,6 +240,7 @@ pub enum ParseErrors {
     CannotUseFixedIndexingWithThisType(VType),
     CannotWrapWithThisStatement(SStatementEnum),
     ErrorParsingFunctionArgs(Box<ParseError>),
+    MacroError(MacroError),
 }
 impl ParseErrors {
     fn fmtgs(
@@ -285,14 +287,21 @@ impl ParseErrors {
                 write!(f, "error parsing function args: ")?;
                 parse_error.fmt_custom(f, file)
             }
+            Self::MacroError(e) => write!(f, "error in macro: {e}"),
         }
     }
 }
 
+use implementation::*;
+
+pub mod implementation {
+
+    use super::*;
+
     fn parse_block(file: &mut File) -> Result<SBlock, ParseError> {
         parse_block_advanced(file, None, true, false, false)
     }
-fn parse_block_advanced(
+    pub(crate) fn parse_block_advanced(
         file: &mut File,
         assume_single_statement: Option<bool>,
         treat_closed_block_bracket_as_closing_delimeter: bool,
@@ -376,10 +385,75 @@ fn parse_block_advanced(
         Ok(SBlock::new(statements))
     }
 
-fn parse_statement(file: &mut File) -> Result<SStatement, ParseError> {
+    /// convenience function. If you require a string, use this. If the first character is a " it will parse
+    /// until it finds a closing ". If the first character is anything else it will parse until it finds a character matching closing_char.
+    /// Escape sequences (like \n) will only be interpreted as such if "" is used.
+    pub(crate) fn parse_string_val<F>(file: &mut File, closing_char: F) -> String
+    where
+        F: Fn(char) -> bool,
+    {
+        match file.peek() {
+            Some('"') => {
+                file.next();
+                parse_string(file).unwrap_or(String::new())
+            }
+            _ => {
+                let mut buf = String::new();
+                loop {
+                    if let Some(ch) = file.next() {
+                        if closing_char(ch) {
+                            file.set_pos(*file.get_ppos());
+                            break;
+                        }
+                        buf.push(ch);
+                    } else {
+                        break;
+                    }
+                }
+                buf
+            }
+        }
+    }
+    /// assumes the starting " has already been consumed.
+    pub(crate) fn parse_string(file: &mut File) -> Result<String, ParseError> {
+        let mut buf = String::new();
+        let err_start_of_statement = *file.get_pos();
+        loop {
+            match file.next() {
+                Some('\\') => {
+                    if let Some(ch) = file.next() {
+                        buf.push(match ch {
+                                '\\' => '\\',
+                                'n' => '\n',
+                                't' => '\t',
+                                '"' => '"',
+                                ch => {
+                                    eprintln!("Warn: Weird char escape \"\\{ch}\", will be replaced with \"{ch}\".");
+                                    ch
+                                },
+                            })
+                    }
+                }
+                Some('"') => break,
+                Some(ch) => buf.push(ch),
+                None => {
+                    return Err(ParseError {
+                        err: ParseErrors::FoundEofInString,
+                        location: err_start_of_statement,
+                        location_end: Some(*file.get_pos()),
+                        context: vec![],
+                        info: None,
+                    })
+                }
+            }
+        }
+        Ok(buf)
+    }
+
+    pub(crate) fn parse_statement(file: &mut File) -> Result<SStatement, ParseError> {
         parse_statement_adv(file, false)
     }
-fn parse_statement_adv(
+    pub(crate) fn parse_statement_adv(
         file: &mut File,
         is_part_of_chain_already: bool,
     ) -> Result<SStatement, ParseError> {
@@ -415,37 +489,7 @@ fn parse_statement_adv(
             }
             Some('"') => {
                 file.next();
-            let mut buf = String::new();
+                Some(SStatementEnum::Value(VDataEnum::String(parse_string(file)?).to()).to())
-            loop {
-                match file.next() {
-                    Some('\\') => {
-                        if let Some(ch) = file.next() {
-                            buf.push(match ch {
-                                '\\' => '\\',
-                                'n' => '\n',
-                                't' => '\t',
-                                '"' => '"',
-                                ch => {
-                                    eprintln!("Warn: Weird char escape \"\\{ch}\", will be replaced with \"{ch}\".");
-                                    ch
-                                },
-                            })
-                        }
-                    }
-                    Some('"') => break,
-                    Some(ch) => buf.push(ch),
-                    None => {
-                        return Err(ParseError {
-                            err: ParseErrors::FoundEofInString,
-                            location: err_start_of_statement,
-                            location_end: Some(*file.get_pos()),
-                            context: vec![],
-                            info: None,
-                        })
-                    }
-                }
-            }
-            Some(SStatementEnum::Value(VDataEnum::String(buf).to()).to())
             }
             _ => None,
         };
@@ -643,7 +687,9 @@ fn parse_statement_adv(
                                 break SStatementEnum::Match(match_what, cases).to();
                             }
                             "true" => break SStatementEnum::Value(VDataEnum::Bool(true).to()).to(),
-                        "false" => break SStatementEnum::Value(VDataEnum::Bool(false).to()).to(),
+                            "false" => {
+                                break SStatementEnum::Value(VDataEnum::Bool(false).to()).to()
+                            }
                             _ => {
                                 // int, float, var
                                 break {
@@ -672,7 +718,8 @@ fn parse_statement_adv(
                                     //     SStatementEnum::Value(VDataEnum::Float(v).to()).to()
                                     } else {
                                         if start.starts_with('&') {
-                                        SStatementEnum::Variable(start[1..].to_string(), true).to()
+                                            SStatementEnum::Variable(start[1..].to_string(), true)
+                                                .to()
                                         } else {
                                             SStatementEnum::Variable(start.to_string(), false).to()
                                         }
@@ -684,21 +731,48 @@ fn parse_statement_adv(
                     Some('(') => {
                         // parse_block_advanced: only treat ) as closing delimeter, don't use single-statement (missing {, so would be assumed otherwise)
                         let name = start.trim();
-                    if name.is_empty() {
+                        match name {
+                            "" => {
                                 break SStatementEnum::FunctionDefinition(
                                     None,
                                     parse_function(file, Some(err_start_of_statement))?,
                                 )
                                 .to();
-                    } else {
+                            }
+                            "!" => {
+                                break SStatementEnum::Macro(
+                                    match crate::script::code_macro::parse_macro(file) {
+                                        Ok(v) => v,
+                                        Err(e) => {
+                                            return Err(ParseError {
+                                                err: ParseErrors::MacroError(e),
+                                                location: err_start_of_statement,
+                                                location_end: Some(*file.get_pos()),
+                                                context: vec![],
+                                                info: None,
+                                            });
+                                        }
+                                    },
+                                )
+                                .to()
+                            }
+                            _ => {
                                 break SStatementEnum::FunctionCall(
                                     name.to_string(),
-                            match parse_block_advanced(file, Some(false), false, false, true) {
+                                    match parse_block_advanced(
+                                        file,
+                                        Some(false),
+                                        false,
+                                        false,
+                                        true,
+                                    ) {
                                         Ok(block) => block.statements,
                                         Err(e) => {
                                             // NOTE: Alternatively, just add an entry to the original error's context.
                                             return Err(ParseError {
-                                        err: ParseErrors::ErrorParsingFunctionArgs(Box::new(e)),
+                                                err: ParseErrors::ErrorParsingFunctionArgs(
+                                                    Box::new(e),
+                                                ),
                                                 location: err_start_of_statement,
                                                 location_end: Some(*file.get_pos()),
                                                 context: vec![],
@@ -710,6 +784,7 @@ fn parse_statement_adv(
                                 .to();
                             }
                         }
+                    }
                     Some(ch) => start.push(ch),
                     None => {
                         return Err(ParseError {
@@ -734,7 +809,8 @@ fn parse_statement_adv(
             if !is_part_of_chain_already {
                 let mut chain_length = 0;
                 let mut err_end_of_prev = err_end_of_original_statement;
-            while let Some('.') = file.get_char(file.get_pos().current_char_index.saturating_sub(1))
+                while let Some('.') =
+                    file.get_char(file.get_pos().current_char_index.saturating_sub(1))
                 {
                     let err_start_of_wrapper = *file.get_pos();
                     let wrapper = parse_statement_adv(file, true)?;
@@ -815,7 +891,7 @@ fn parse_statement_adv(
     /// Assumes the function name and opening bracket have already been parsed. File should continue like "name type name type ...) <statement>"
     fn parse_function(
         file: &mut File,
-    err_fn_start: Option<super::file::FilePosition>,
+        err_fn_start: Option<crate::parse::file::FilePosition>,
     ) -> Result<SFunction, ParseError> {
         file.skip_whitespaces();
         // find the arguments to the function
@@ -1098,3 +1174,4 @@ fn parse_single_type_adv(
             closed_bracket_in_fn_args,
         ))
     }
+}

mers/src/script/code_parsed.rs

@@ -1,6 +1,6 @@
 use std::fmt::{self, Display, Formatter, Pointer};
 
-use super::{global_info::GSInfo, val_data::VData, val_type::VType};
+use super::{code_macro::Macro, global_info::GSInfo, val_data::VData, val_type::VType};
 
 pub enum SStatementEnum {
     Value(VData),
@@ -17,6 +17,7 @@ pub enum SStatementEnum {
     Match(String, Vec<(SStatement, SStatement)>),
     IndexFixed(SStatement, usize),
     EnumVariant(String, SStatement),
+    Macro(Macro),
 }
 impl SStatementEnum {
     pub fn to(self) -> SStatement {
@@ -172,6 +173,9 @@ impl SStatementEnum {
                 write!(f, "{variant}: ")?;
                 inner.fmtgs(f, info)
             }
+            Self::Macro(m) => {
+                write!(f, "!({m})")
+            }
         }
     }
 }

mers/src/script/mod.rs

@@ -1,4 +1,5 @@
 pub mod builtins;
+pub mod code_macro;
 pub mod code_parsed;
 pub mod code_runnable;
 pub mod global_info;

mers/src/script/to_runnable.rs

@@ -16,6 +16,7 @@ use crate::{
 
 use super::{
     builtins::BuiltinFunction,
+    code_macro::Macro,
     code_parsed::{SBlock, SFunction, SStatement, SStatementEnum},
     code_runnable::{RBlock, RFunction, RScript, RStatement, RStatementEnum},
 };
@@ -565,6 +566,9 @@ fn statement(
                     v
                 }
             }, statement(s, ginfo, linfo)?),
+            SStatementEnum::Macro(m) => match m {
+                Macro::StaticMers(val) => RStatementEnum::Value(val.clone()),
+            },
         }
         .to();
     // if force_output_type is set, verify that the real output type actually fits in the forced one.

mers/src/script/val_data.rs

@@ -47,6 +47,9 @@ impl PartialEq for VDataEnum {
 }
 
 impl VData {
+    pub fn safe_to_share(&self) -> bool {
+        self.data.safe_to_share()
+    }
     pub fn out(&self) -> VType {
         VType {
             types: vec![self.out_single()],
@@ -82,6 +85,15 @@ impl VDataEnum {
 
 // get()
 impl VDataEnum {
+    pub fn safe_to_share(&self) -> bool {
+        match self {
+            Self::Bool(_) | Self::Int(_) | Self::Float(_) | Self::String(_) | Self::Function(_) => {
+                true
+            }
+            Self::Tuple(v) | Self::List(_, v) => v.iter().all(|v| v.safe_to_share()),
+            Self::Thread(..) | Self::Reference(..) | Self::EnumVariant(..) => false,
+        }
+    }
     pub fn noenum(self) -> VData {
         match self {
             Self::EnumVariant(_, v) => *v,