From dfc1f89bfa4161fac1c022ba758956640f730763 Mon Sep 17 00:00:00 2001
From: Lior Spach <ls12@inf.ufpr.br>
Date: Mon, 27 Apr 2015 15:13:59 -0300
Subject: [PATCH] =?UTF-8?q?Lexer=20novo,=20ainda=20em=20vers=C3=A3o=20scri?=
=?UTF-8?q?pt.?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
---
compiler/Lexer.scala | 58 +++++++++++++++++++++++++++++++-------------
1 file changed, 41 insertions(+), 17 deletions(-)
diff --git a/compiler/Lexer.scala b/compiler/Lexer.scala
index 6590f57..d36d6e0 100644
--- a/compiler/Lexer.scala
+++ b/compiler/Lexer.scala
@@ -1,23 +1,47 @@
-import io.{Source,BufferedSource}
+#!/usr/bin/scala
+!#
+println("started...")
+case class Token(val value:String, val func:String)
-case class Atomo(val valor:String, val token:String)
+val palavrasReservadas = List("begin", "end", "function", "procedure", "var", "program")
+
+// Conjuntos
+val num = (c:Char) => ('0' to '9').contains(c)
+val op = (c:Char) => "+-*/=:".contains(c)
+val letra = (c:Char) => ('a' to 'z').contains(c) || ('A' to 'Z').contains(c) || c=='_'
+val espacoLinTab = (c:Char) => c==' ' || c=='\t' || c=='\n'
+val palavraReservada = (s:String) => palavrasReservadas.contains(s)
+
+//Acoes
+val erro = (msg:String) => {println("Erro: "+msg); sys.exit(1)}
-object Lexer {
- def getTokens(stream:Iterator[Char]):List[atomo] = {
- var proximo: Char = ''
- var acc = ""
-
- def PROX = if (stream.hasNext) proximo = stream.next
- def ADD = acc + proximo
- PROX
- proximo match { //TODO: Pattern Matching
- case ' ' || '\t' || '\n' =>
- case letra =>
- case numero =>
- case simbolo_especial =>
+def atomo(str:String) {
+ val iter = str.iterator
+ while (iter.hasNext) {
+ def take(iter:Iterator[Char]) = iter.takeWhile{(c) => ! espacoLinTab(c)}.mkString
+ iter.dropWhile(espacoLinTab)
+ val c = iter.next
+ var acc = ""
+ println(
+ c match {
+ case c if num(c) =>
+ acc = c + take(iter)
+ if ( acc.exists{(c) => !num(c)} ) erro(acc+" nao eh numero")
+ (acc,"numero")
+ case c if op(c) => (c, "op")
+ case c if letra(c) => (c, "letra")
+ acc = c + take(iter)
+ if ( acc.exists{(c) => !(num(c) || letra(c)) } ) erro(acc+" nao eh identificador valido")
+ if (palavraReservada(acc)) (acc,"reservado")
+ else (acc, "identificador")
+ case c if espacoLinTab(c) => /*pula*/
+ case erroCh => erro(erroCh+"")
}
-
+ )
}
-
}
+
+
+while (true)
+ atomo(readLine)
\ No newline at end of file
--
GitLab