213 lines
8.4 KiB
Nim
213 lines
8.4 KiB
Nim
# Builtins
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import sequtils
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import strutils
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import strformat
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# Our stuff
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import frontend/lexer as l
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import frontend/parser as p
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import frontend/compiler as c
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import util/debugger
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# Thanks art <3
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import jale/editor as ed
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import jale/templates
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import jale/plugin/defaults
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import jale/plugin/editor_history
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import jale/keycodes
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import jale/multiline
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# Forward declarations
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proc fillSymbolTable(tokenizer: Lexer)
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proc getLineEditor: LineEditor
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const debugLexer = false
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const debugParser = true
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const debugCompiler = true
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when isMainModule:
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setControlCHook(proc () {.noconv.} = quit(0))
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var keep = true
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var tokens: seq[Token] = @[]
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var tree: seq[ASTNode] = @[]
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var compiled: Chunk
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var tokenizer = newLexer()
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var parser = newParser()
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var compiler = initCompiler()
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let editor = getLineEditor()
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var input: string
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editor.bindEvent(jeQuit):
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keep = false
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editor.bindKey("ctrl+a"):
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editor.content.home()
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editor.bindKey("ctrl+e"):
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editor.content.`end`()
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tokenizer.fillSymbolTable()
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while keep:
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try:
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input = editor.read()
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if input.len() > 0:
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# Currently the parser doesn't handle these tokens well
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tokens = filter(tokenizer.lex(input, "<stdin>"), proc (x: Token): bool = x.kind notin {TokenType.Whitespace, Tab})
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when debugLexer:
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echo "Tokenization step:"
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for i, token in tokens:
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if i == tokens.high():
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# Who cares about EOF?
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break
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echo "\t", token
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echo ""
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tree = parser.parse(tokens, "<stdin>")
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when debugParser:
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echo "Parsing step:"
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for node in tree:
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echo "\t", node
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echo ""
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compiled = compiler.compile(tree, "<stdin>")
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when debugCompiler:
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echo "Compilation step:"
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stdout.write("\t")
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echo &"""Raw byte stream: [{compiled.code.join(", ")}]"""
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echo "\nBytecode disassembler output below:\n"
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disassembleChunk(compiled, "<stdin>")
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echo ""
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except IOError:
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break
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# TODO: The code for error reporting completely
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# breaks down with multiline input, fix it
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except LexingError:
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let lineNo = tokenizer.getLine()
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let relPos = tokenizer.getRelPos(lineNo)
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let line = tokenizer.getSource().splitLines()[lineNo - 1].strip()
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echo getCurrentExceptionMsg()
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echo &"Source line: {line}"
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echo " ".repeat(relPos.start + len("Source line: ")) & "^".repeat(relPos.stop - relPos.start)
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except ParseError:
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let lineNo = parser.getCurrentToken().line
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let relPos = tokenizer.getRelPos(lineNo)
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let line = tokenizer.getSource().splitLines()[lineNo - 1].strip()
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echo getCurrentExceptionMsg()
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echo &"Source line: {line}"
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echo " ".repeat(relPos.start + len("Source line: ")) & "^".repeat(relPos.stop - parser.getCurrentToken().lexeme.len())
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quit(0)
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proc fillSymbolTable(tokenizer: Lexer) =
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## Initializes the Lexer's symbol
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## table with the builtin symbols
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## and keywords
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# 1-byte symbols
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tokenizer.symbols.addSymbol("`", Backtick)
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tokenizer.symbols.addSymbol("+", Plus)
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tokenizer.symbols.addSymbol("-", Minus)
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tokenizer.symbols.addSymbol("*", Star)
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tokenizer.symbols.addSymbol("/", Slash)
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tokenizer.symbols.addSymbol("{", LeftBrace)
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tokenizer.symbols.addSymbol("}", RightBrace)
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tokenizer.symbols.addSymbol("(", LeftParen)
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tokenizer.symbols.addSymbol(")", RightParen)
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tokenizer.symbols.addSymbol("[", LeftBracket)
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tokenizer.symbols.addSymbol("]", RightBracket)
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tokenizer.symbols.addSymbol(".", Dot)
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tokenizer.symbols.addSymbol(",", Comma)
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tokenizer.symbols.addSymbol(">", TokenType.GreaterThan)
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tokenizer.symbols.addSymbol("<", TokenType.LessThan)
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tokenizer.symbols.addSymbol(";", Semicolon)
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tokenizer.symbols.addSymbol("=", Equal)
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tokenizer.symbols.addSymbol("~", Tilde)
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tokenizer.symbols.addSymbol("%", Percentage)
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tokenizer.symbols.addSymbol(":", Colon)
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tokenizer.symbols.addSymbol("&", Ampersand)
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tokenizer.symbols.addSymbol("^", Caret)
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tokenizer.symbols.addSymbol("|", Pipe)
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# 2-byte symbols
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tokenizer.symbols.addSymbol("+=", InplaceAdd)
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tokenizer.symbols.addSymbol("-=", InplaceSub)
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tokenizer.symbols.addSymbol(">=", TokenType.GreaterOrEqual)
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tokenizer.symbols.addSymbol("<=", TokenType.LessOrEqual)
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tokenizer.symbols.addSymbol("*=", InplaceMul)
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tokenizer.symbols.addSymbol("/=", InplaceDiv)
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tokenizer.symbols.addSymbol("&=", InplaceAnd)
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tokenizer.symbols.addSymbol("!=", NotEqual)
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tokenizer.symbols.addSymbol("|=", InplaceOr)
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tokenizer.symbols.addSymbol("^=", InplaceXor)
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tokenizer.symbols.addSymbol("%=", InplaceMod)
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tokenizer.symbols.addSymbol("//", FloorDiv)
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tokenizer.symbols.addSymbol("==", DoubleEqual)
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tokenizer.symbols.addSymbol("**", DoubleStar)
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tokenizer.symbols.addSymbol(">>", RightShift)
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tokenizer.symbols.addSymbol("<<", LeftShift)
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# 3-byte symbols
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tokenizer.symbols.addSymbol("//=", InplaceFloorDiv)
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tokenizer.symbols.addSymbol("**=", InplacePow)
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tokenizer.symbols.addSymbol(">>=", InplaceRightShift)
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tokenizer.symbols.addSymbol("<<=", InplaceLeftShift)
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# Keywords
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tokenizer.symbols.addKeyword("type", Type)
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tokenizer.symbols.addKeyword("enum", Enum)
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tokenizer.symbols.addKeyword("case", Case)
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tokenizer.symbols.addKeyword("operator", Operator)
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tokenizer.symbols.addKeyword("generator", Generator)
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tokenizer.symbols.addKeyword("function", Function)
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tokenizer.symbols.addKeyword("coroutine", Coroutine)
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tokenizer.symbols.addKeyword("break", TokenType.Break)
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tokenizer.symbols.addKeyword("continue", Continue)
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tokenizer.symbols.addKeyword("while", While)
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tokenizer.symbols.addKeyword("for", For)
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tokenizer.symbols.addKeyword("foreach", Foreach)
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tokenizer.symbols.addKeyword("if", If)
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tokenizer.symbols.addKeyword("else", Else)
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tokenizer.symbols.addKeyword("await", TokenType.Await)
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tokenizer.symbols.addKeyword("defer", Defer)
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tokenizer.symbols.addKeyword("try", Try)
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tokenizer.symbols.addKeyword("except", Except)
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tokenizer.symbols.addKeyword("finally", Finally)
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tokenizer.symbols.addKeyword("raise", TokenType.Raise)
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tokenizer.symbols.addKeyword("assert", TokenType.Assert)
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tokenizer.symbols.addKeyword("const", Const)
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tokenizer.symbols.addKeyword("let", Let)
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tokenizer.symbols.addKeyword("var", Var)
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tokenizer.symbols.addKeyword("import", Import)
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tokenizer.symbols.addKeyword("yield", TokenType.Yield)
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tokenizer.symbols.addKeyword("return", TokenType.Return)
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# These are technically more like expressions
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# with a reserved name that produce a value of a
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# builtin type, but we don't need to care about
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# that until we're in the parsing and compilation
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# steps so it's fine
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tokenizer.symbols.addKeyword("nan", NotANumber)
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tokenizer.symbols.addKeyword("inf", Infinity)
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tokenizer.symbols.addKeyword("nil", TokenType.Nil)
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tokenizer.symbols.addKeyword("true", TokenType.True)
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tokenizer.symbols.addKeyword("false", TokenType.False)
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# These are technically operators, but since
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# they fit neatly into the definition for an
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# identifier/keyword we parse them as such
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# and specialize them later
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tokenizer.symbols.addKeyword("isnot", IsNot)
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tokenizer.symbols.addKeyword("is", Is)
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tokenizer.symbols.addKeyword("as", As)
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tokenizer.symbols.addKeyword("of", Of)
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tokenizer.symbols.addKeyword("and", TokenType.LogicalAnd)
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tokenizer.symbols.addKeyword("or", TokenType.LogicalOr)
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tokenizer.symbols.addKeyword("not", TokenType.LogicalNot)
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# P.S.: There's no reason for the order of addition of
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# symbols to be ascending in length (the symbol table uses
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# a hashmap internally). You can add/remove symbols (and
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# keywords for that matter) as you like!
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proc getLineEditor: LineEditor =
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result = newLineEditor()
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result.prompt = "=> "
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result.populateDefaults() # Setup default keybindings
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let hist = result.plugHistory() # Create history object
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result.bindHistory(hist) # Set default history keybindings
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