Rewriting statement system for expr statements

mist-test/Cargo.toml

@@ -5,6 +5,6 @@ edition = "2024"
 
 [[bin]]
 name = "main"
-path = "build/main.rs"
+path = ".mist/src/main.rs"
 
 [dependencies]

mist-test/src/app.mist

@@ -1,95 +0,0 @@
-use <super::task>;
-use <super::logger>;
-use <super::event>;
-
-pub class Application {
-    String name;
-
-    Vec<task::Task> tasks;
-    Vec<String> plugins;
-
-    logger::Logger logger;
-
-    bool running;
-    i32 ticks;
-
-    pub constructor(str* name) {
-        self.name = name.to_string();
-
-        self.tasks = new Vec();
-        self.plugins = new Vec();
-
-        self.logger = new logger::Logger("app");
-
-        self.running = false;
-        self.ticks = 0;
-    }
-
-    pub void boot(self mut*) {
-        self.logger.info("booting application");
-
-        self.running = true;
-
-        self.emit(event::Event::Startup);
-    }
-
-    pub void run(self mut*) {
-        while(self.running) {
-            self.tick();
-
-            if(self.ticks >= 5) {
-                self.shutdown();
-            }
-        }
-    }
-
-    void tick(self mut*) {
-        self.logger.info("tick");
-
-        self.ticks++;
-
-        var task = task::create_task("background-job");
-
-        self.tasks.push(task);
-
-        println!("tasks: {}", self.tasks.len());
-    }
-
-    pub void shutdown(self mut*) {
-        self.emit(event::Event::Shutdown);
-
-        self.logger.warning("shutdown");
-
-        self.running = false;
-    }
-
-    pub void register_plugin(self mut*, String name) {
-        self.plugins.push(name.clone());
-
-        self.emit(event::Event::PluginLoaded(name));
-    }
-
-    void emit(self*, event::Event event) {
-        match(event) {
-            event::Event::Startup => {
-                self.logger.info("startup event");
-            }
-
-            event::Event::Shutdown => {
-                self.logger.info("shutdown event");
-            }
-
-            event::Event::PluginLoaded(name) => {
-                println!("plugin loaded: {}", name);
-            }
-
-            event::Event::TaskExecuted(name) => {
-                println!("task executed: {}", name);
-            }
-
-            event::Event::Error(message) => {
-                self.logger.error(&message);
-            }
-        }
-    }
-}

mist-test/src/event.mist

@@ -1,7 +0,0 @@
-pub enum Event {
-    Startup,
-    Shutdown,
-    TaskExecuted(String),
-    PluginLoaded(String),
-    Error(String),
-}

mist-test/src/logger.mist

@@ -1,78 +0,0 @@
-use <std::fmt::Formatter>;
-use <std::fmt>;
-
-pub trait TestLogging<T: fmt::Display>: fmt::Display {
-    String get(self*);
-}
-
-pub enum LogLevel {
-    Info,
-    Warning,
-    Error,
-}
-
-impl fmt::Display for LogLevel {
-    fmt::Result fmt(self*, Formatter<'_> mut* f) {
-        match (self) {
-            LogLevel::Info => {
-                return write!(f, "[INFO]");
-            }
-
-            LogLevel::Warning => {
-                return write!(f, "[WARN]");
-            }
-
-            LogLevel::Error => {
-                return write!(f, "[ERROR]");
-            }
-        }
-    }
-}
-
-impl TestLogging<LogLevel> for LogLevel {
-    String get(self*) {
-        return format!("{self}");
-    }
-}
-
-pub class Logger {
-    String prefix;
-
-    pub constructor(str* prefix) {
-        self.prefix = prefix.to_string();
-    }
-
-    pub void info(self*, str* message) {
-        self.log(LogLevel::Info, message);
-    }
-
-    pub void warning(self*, str* message) {
-        self.log(LogLevel::Warning, message);
-    }
-
-    pub void error(self*, str* message) {
-        self.log(LogLevel::Error, message);
-    }
-
-    void log(self*, LogLevel level, str* message) {
-        match(level) {
-            LogLevel::Info => {
-                println!("{level} {} {}", self.prefix, message);
-            }
-
-            LogLevel::Warning => {
-                println!("{} {} {}", level.get(), self.prefix, message);
-            }
-
-            LogLevel::Error => {
-                println!("{level} {} {}", self.prefix, message);
-            }
-        }
-    }
-
-    impl fmt::Display {
-        fmt::Result fmt(self*, Formatter<'_> mut* f) {
-            return write!(f, "logger ({})", self.prefix);
-        }
-    }
-}

mist-test/src/main.mist

@@ -1,15 +1,3 @@
-pub mod app;
-pub mod task;
-pub mod plugin;
-pub mod logger;
-pub mod event;
-
 void main() {
-    var mut app_instance = new app::Application("mist-app");
-
-    // greeting::register(&mut app_instance);
-    // statistics::register(&mut app_instance);
-
-    app_instance.boot();
-    app_instance.run();
-}
+    println!("hello, world");
+}

mist-test/src/plugin.mist

@@ -1,16 +0,0 @@
-pub struct PluginInfo {
-    pub String name,
-    pub String version,
-}
-
-pub class PluginRegistry<T> {
-    T plugins;
-
-    pub constructor(T plugins) {
-        self.plugins = plugins;
-    }
-
-    pub T plugins(self) {
-        return self.plugins;
-    }
-}

mist-test/src/task.mist

@@ -1,20 +0,0 @@
-pub enum TaskState {
-    Pending,
-    Running,
-    Finished,
-    Failed,
-}
-
-pub struct Task {
-    pub String name,
-    pub TaskState state,
-    pub i32 executions,
-}
-
-pub Task create_task(str* name) {
-    return Task {
-        name: name.to_string(),
-        state: TaskState::Pending,
-        executions: 0,
-    };
-}

parser/src/grammar.pest

@@ -342,53 +342,49 @@ block = {
     "{" ~ (statement | unexpected_statement)* ~ "}"
 }
 
-statement = _{
-    match_stmt
-  | if_stmt
-  | while_stmt
-  | c_for_stmt
-  | for_stmt
-  | return_stmt
-  | break_stmt
-  | continue_stmt
-  | block
-  | increment_statement
-  | decrement_statement
-  | var_decl_statement
-  | assign_statement
-  | expr_stmt
+statement = {
+    (expr | basic_stmt_left_recurse) ~ semicolon
 }
 
 // ------------------------------------------------------
 // BASIC STATEMENTS
 // ------------------------------------------------------
 
-expr_stmt = {
-    expr ~ semicolon
+basic_stmt = {
+    return_stmt
+  | break_stmt
+  | continue_stmt
+  | var_decl_statement
+}
+
+basic_stmt_left_recurse = {
+    increment_statement
+  | decrement_statement
+  | assign_statement
 }
 
 return_stmt = {
-    "return" ~ expr? ~ semicolon
+    "return" ~ expr?
 }
 
 break_stmt = {
-    "break" ~ semicolon
+    "break"
 }
 
 continue_stmt = {
-    "continue" ~ semicolon
+    "continue"
 }
 
 var_decl_statement = {
-    var_decl ~ ("=" ~ expr)? ~ semicolon
+    var_decl ~ ("=" ~ expr)?
 }
 
 increment_statement = {
-    expr ~ "++" ~ semicolon
+    expr ~ "++"
 }
 
 decrement_statement = {
-    expr ~ "--" ~ semicolon
+    expr ~ "--"
 }
 
 compound_assign = {
@@ -497,7 +493,8 @@ expr_path = {
 }
 
 primary = {
-    literal
+    basic_stmt
+  | literal
   | expr_path
   | tuple
   | array

parser/src/parser/common/statement.rs

@@ -41,10 +41,6 @@ impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for Statement {
         match rule {
             Rule::statement => Statement::try_from(inner.next().unwrap()),
 
-            Rule::expr_stmt => {
-                ast_expr!(Statement::Expression(inner.next().unwrap().try_into()))
-            }
-
             Rule::block => ast_expr!(Statement::Block(pair.try_into())),
 
             Rule::var_decl_statement => ast_expr!(Statement::VarDecl(pair.try_into())),