lexer work

.gitignore

@@ -0,0 +1 @@
+kabel-rs/target

kabel-rs/src/lexer.rs

@@ -1,40 +1,45 @@
-pub mod variables;
+use crate::lexutil;
+use lexutil::{Token, StatementToken};
+use std::error::Error;
 
-enum ArithmeticOperatorToken {
-    Add
-    Subtract
-    Multiply
-    Divide
-    Exponentiate
-    Modulus
-}
+pub fn lexer(text_source: &str) -> Result<Vec<Token>, Box<dyn Error>> {
+    println!("Lexing!");
+    let mut lexed: Vec<Token> = Vec::new();
 
-enum BooleanOperatorToken {
-    And
-    Or
-}
+    let mut current_token = String::new();
 
-enum LiteralToken {
-    Str(String)
-    Num(f64)
-}
+    for (i, c) in text_source.chars().enumerate() {
+        current_token.push(c);
+        
+        // Known meaningful tokens
+        match current_token.as_str() {
+            ";" => {
+                lexed.push(Token::Statement(StatementToken::Terminator));
+                current_token = String::new();
+            }
+            "if " => {
+                lexed.push(Token::Statement(StatementToken::Conditional));
+                current_token = String::new();
+                continue;
+            }
+            "to " => {
+                lexed.push(Token::Statement(StatementToken::FunctionDef));
+                current_token = String::new();
+                continue;
+            }
+            "for " => {
+                lexed.push(Token::Statement(StatementToken::ForLoop));
+                current_token = String::new();
+                continue;
+            }
+            "while " => {
+                lexed.push(Token::Statement(StatementToken::WhileLoop));
+                current_token = String::new();
+                continue;
+            }
+            &_ => {}
+        }
+    }
 
-enum StatementToken {
-    If
-    Foreach
-    While
-    To
-}
-
-enum BracketToken {
-    Open
-    Close
-}
-
-enum Token {
-    Literal(LiteralToken)
-    ArithmeticOperator(ArithmeticOperatorToken)
-    Statement(StatementToken)
-    Bracket(BracketToken)
-    Variable(variables::VariableToken)
+    Ok(lexed)
 }

kabel-rs/src/lexutil.rs

@@ -0,0 +1,46 @@
+use crate::variables;
+
+
+// parts of Token
+
+pub enum ArithmeticOperatorToken {
+    Add,
+    Subtract,
+    Multiply,
+    Divide,
+    Exponentiate,
+    Modulus,
+}
+
+pub enum BooleanOperatorToken {
+    And,
+    Or,
+}
+
+pub enum LiteralToken {
+    Str(String),
+    Num(f64),
+}
+
+pub enum StatementToken {
+    Conditional,
+    ForLoop,
+    WhileLoop,
+    FunctionDef,
+    Terminator,
+}
+
+pub enum BracketToken {
+    Open,
+    Close,
+}
+
+pub enum Token {
+    Literal(LiteralToken),
+    ArithmeticOperator(ArithmeticOperatorToken),
+    Statement(StatementToken),
+    Bracket(BracketToken),
+    Variable(variables::VariableToken),
+}
+
+

kabel-rs/src/main.rs

@@ -1,9 +1,51 @@
 use std::env;
-use std::fs;
+use std::error::Error;
+use std::fs::File;
+use std::io::{self, Read};
+use lexutil::Token;
 
-pub mod lexer;
+mod lexer;
+mod lexutil;
+mod modules;
+mod variables;
 
-fn main() {
-    let args: Vec<String> = env::args().collect();
-    dbg!(&args[1]);
+fn main() -> Result<(), Box<dyn Error>> {
+    let argv: Vec<String> = env::args().collect();
+    if argv.len() != 2 {
+        println!("Usage: {} <file.kab>", &argv[0]);
+        std::process::exit(1);
+    }
+
+    let mut source_fd = match File::open(&argv[1]) {
+        Err(e) if e.kind() == io::ErrorKind::NotFound => {
+            std::process::exit(1);
+        }
+        Err(e) => {
+            eprintln!(
+                "Error: Tried opening `{}' and got unexpected error: {}",
+                argv[1],
+                e.kind()
+            );
+            std::process::exit(1);
+        }
+        Ok(fd) => fd,
+    };
+
+    let mut text_source = String::new();
+    source_fd.read_to_string(&mut text_source)?;
+    dbg!(&text_source);
+
+    // Lex!
+    let lexed: Vec<Token> = match lexer::lexer(&text_source) {
+        Err(e) => {
+            eprintln!(
+                "Lexer fail with {}",
+                e
+            );
+            std::process::exit(1);
+        }
+        Ok(lexed) => lexed
+    };
+
+    Ok(())
 }

kabel-rs/src/modules.rs

@@ -0,0 +1,5 @@
+struct Thruster {}
+
+pub enum ModuleVar {
+    Thruster(Thruster),
+}

kabel-rs/src/test.kab

@@ -0,0 +1,3 @@
+#!/usr/bin/env kabel
+declare p = 5;
+debug: print using (3 + p) * 2;

kabel-rs/src/variables.rs

@@ -0,0 +1,7 @@
+use crate::modules;
+
+pub enum VariableToken {
+    Module(modules::ModuleVar),
+    Num(f64),
+    Str(String),
+}