Added notes to README, minor changes to lexer and test file

README.md

@@ -1,3 +1,8 @@
 # peon
 
-Peon is a simple, functional, async-first programming language with a focus on correctness and speed
+Peon is a simple, functional, async-first programming language with a focus on correctness and speed
+
+## Disclaimer
+
+Currently the majority of this code comes from [japl](https://git.nocturn9x.space/japl/JustAnotherJAPL) and is
+being adapted to the new paradigm and type system. Nothing really works yet

src/frontend/lexer.nim

@@ -64,9 +64,6 @@ proc addSymbol*(self: SymbolTable, lexeme: string, token: TokenType) =
     self.symbols[lexeme] = token
 
 
-proc existsSymbol*(self: SymbolTable, lexeme: string): bool {.inline.} = lexeme in self.symbols
-
-
 proc removeSymbol*(self: SymbolTable, lexeme: string)  =
     ## Removes a symbol from the symbol table
     ## (does nothing if it does not exist)
@@ -85,10 +82,24 @@ proc removeKeyword*(self: SymbolTable, lexeme: string)  =
     self.keywords.del(lexeme)
 
 
+
+proc existsSymbol*(self: SymbolTable, lexeme: string): bool {.inline.} = 
+    ## Returns true if a given symbol exists 
+    ## in the symbol table already
+    lexeme in self.symbols
+
+
+proc existsKeyword*(self: SymbolTable, lexeme: string): bool {.inline.} = 
+    ## Returns true if a given keyword exists 
+    ## in the symbol table already
+    lexeme in self.keywords
+
+
 proc getToken(self: Lexer, lexeme: string): Token =
-    ## Gets the matching token object for a given string
-    ## or returns nil if there's no match
-    var table = self.symbols
+    ## Gets the matching token object for a given
+    ## string according to the symbol table or 
+    ## returns nil if there's no match
+    let table = self.symbols
     var kind = table.symbols.getOrDefault(lexeme, table.keywords.getOrDefault(lexeme, NoMatch))
     if kind == NoMatch:
         return nil
@@ -131,7 +142,8 @@ proc isAlphaNumeric(s: string): bool =
             return false
     return true
 
-# Simple public getters
+# Simple public getters used for error
+# formatting and whatnot
 proc getStart*(self: Lexer): int = self.start
 proc getCurrent*(self: Lexer): int = self.current
 proc getLine*(self: Lexer): int = self.line

src/test.nim

@@ -1,24 +1,24 @@
+# Builtins
 import sequtils
+import strutils
+import strformat
 
-import frontend/lexer
+# Our stuff
+import frontend/lexer as l
 import frontend/parser as p
-import jale/editor
+
+# Thanks art <3
+import jale/editor as ed
 import jale/templates
 import jale/plugin/defaults
 import jale/plugin/editor_history
 import jale/keycodes
 import jale/multiline
 
+
+# Forward declarations
 proc fillSymbolTable(tokenizer: Lexer)
-
-
-proc getLineEditor: LineEditor =
-    result = newLineEditor()
-    result.prompt = "=> "
-    result.populateDefaults()        # Setup default keybindings
-    let hist = result.plugHistory()  # Create history object
-    result.bindHistory(hist)         # Set default history keybindings
-
+proc getLineEditor: LineEditor
 
 
 when isMainModule:
@@ -27,21 +27,21 @@ when isMainModule:
     var tokens: seq[Token] = @[]
     var tokenizer = newLexer()
     var parser = newParser()
-    let lineEditor = getLineEditor()
+    let editor = getLineEditor()
     var input: string
-    lineEditor.bindEvent(jeQuit):
+    editor.bindEvent(jeQuit):
         keep = false
-    lineEditor.bindKey("ctrl+a"):
-        lineEditor.content.home()
-    lineEditor.bindKey("ctrl+e"):
-        lineEditor.content.`end`()
+    editor.bindKey("ctrl+a"):
+        editor.content.home()
+    editor.bindKey("ctrl+e"):
+        editor.content.`end`()
     tokenizer.fillSymbolTable()
     while keep:
         try:
-            input = lineEditor.read()
+            input = editor.read()
             if input.len() > 0:
                 # Currently the parser doesn't handle these tokens well
-                tokens = filter(tokenizer.lex(input, "<stdin>"), proc (x: Token): bool = x.kind notin {Whitespace, Tab})
+                tokens = filter(tokenizer.lex(input, "<stdin>"), proc (x: Token): bool = x.kind notin {TokenType.Whitespace, Tab})
                 echo "Tokenization step:"
                 for i, token in tokens:
                     if i == tokens.high():
@@ -55,9 +55,19 @@ when isMainModule:
         except IOError:
             break
         except LexingError:
+            let lineNo = tokenizer.getLine()
+            let relPos = tokenizer.getRelPos(lineNo)
+            let line = tokenizer.getSource().splitLines()[lineNo - 1].strip()
             echo getCurrentExceptionMsg()
+            echo &"Source line: {line}"
+            echo " ".repeat(relPos.start + len("Source line: ")) & "^".repeat(relPos.stop - relPos.start)
         except ParseError:
+            let lineNo = parser.getCurrentToken().line
+            let relPos = tokenizer.getRelPos(lineNo)
+            let line = tokenizer.getSource().splitLines()[lineNo - 1].strip()
             echo getCurrentExceptionMsg()
+            echo &"Source line: {line}"
+            echo " ".repeat(relPos.start + len("Source line: ")) & "^".repeat(relPos.stop - parser.getCurrentToken().lexeme.len())
     quit(0)
 
 
@@ -164,7 +174,14 @@ proc fillSymbolTable(tokenizer: Lexer) =
     tokenizer.symbols.addKeyword("not", LogicalNot)
 
     # P.S.: There's no reason for the order of addition of
-    # symbols to be ascending (the symbol table uses a hashmap
-    # intrernally). You can add/remove symbols (and keywords
-    # for that matter) as you like!
+    # symbols to be ascending in length (the symbol table uses 
+    # a hashmap internally). You can add/remove symbols (and
+    # keywords for that matter) as you like!
 
+
+proc getLineEditor: LineEditor =
+    result = newLineEditor()
+    result.prompt = "=> "
+    result.populateDefaults()        # Setup default keybindings
+    let hist = result.plugHistory()  # Create history object
+    result.bindHistory(hist)         # Set default history keybindings