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Lior Spach
pascal-compiler
Commits
a1a9aeb7
Commit
a1a9aeb7
authored
10 years ago
by
Lior Spach
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Reconhece ; e retorna lista de tokens
parent
8feaf533
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1 changed file
compiler/Lexer.scala
+18
-11
18 additions, 11 deletions
compiler/Lexer.scala
with
18 additions
and
11 deletions
compiler/Lexer.scala
+
18
−
11
View file @
a1a9aeb7
...
...
@@ -7,12 +7,14 @@ case class Token(val value:String, val func:String)
val
palavrasReservadas
=
List
(
"begin"
,
"end"
,
"function"
,
"procedure"
,
"var"
,
"program"
)
val
letras
=
List
.
concat
(
'a'
to
'z'
,
'A'
to
'Z'
,
"_"
)
val
numeros
=
(
'0'
to
'9'
).
toList
val
separadores
=
List
(
' '
,
'\t'
,
'\n'
,
';'
)
//Funcoes booleanas
val
num
=
(
c
:
Char
)
=>
numeros
.
contains
(
c
)
val
op
=
(
c
:
Char
)
=>
"+-*/=:"
.
contains
(
c
)
val
letra
=
(
c
:
Char
)
=>
letras
.
contains
(
c
)
val
espacoLinTab
=
(
c
:
Char
)
=>
c
==
' '
||
c
==
'\t'
||
c
==
'\n'
val
separador
=
(
c
:
Char
)
=>
separadores
.
contains
(
c
)
val
palavraReservada
=
(
s
:
String
)
=>
palavrasReservadas
.
contains
(
s
)
//Verificadores
...
...
@@ -25,42 +27,47 @@ val erro = (msg:String) => {println("Erro: "+msg); sys.exit(1)}
def
take
(
iter
:
BufferedIterator
[
Char
])
=
{
var
acc
=
""
while
(
iter
.
hasNext
&&
!
espacoLinTab
(
iter
.
head
)
&&
!
op
(
iter
.
head
))
while
(
iter
.
hasNext
&&
!
separador
(
iter
.
head
)
&&
!
op
(
iter
.
head
))
acc
+=
iter
.
next
acc
}
def
atomo
(
str
:
String
)
{
def
atomo
(
str
:
String
)
:
List
[
Token
]
=
{
var
tokenList
=
List
[
Token
]()
val
iter
=
str
.
iterator
.
buffered
while
(
iter
.
hasNext
)
{
val
c
=
iter
.
next
println
(
c
match
{
tokenList
=
(
c
match
{
case
c
if
num
(
c
)
=>
//NUMERO
val
acc
=
c
+
take
(
iter
)
verificaNumero
(
acc
)
(
acc
,
"numero"
)
Token
(
acc
,
"numero"
)
case
c
if
op
(
c
)
=>
//OPERADOR
if
((
c
==
':'
)
&&
(
iter
.
head
==
'='
))
(
c
+
""
+
iter
.
next
,
"op"
)
Token
(
c
+
""
+
iter
.
next
,
"op"
)
else
(
c
,
"op"
)
Token
(
c
+
""
,
"op"
)
case
c
if
letra
(
c
)
=>
//IDENTIFICADOR
val
acc
=
c
+
take
(
iter
)
verificaIdentificador
(
acc
)
if
(
palavraReservada
(
acc
))
(
acc
,
"reservado"
)
Token
(
acc
,
"reservado"
)
else
(
acc
,
"identificador"
)
Token
(
acc
,
"identificador"
)
case
c
if
espacoLinTab
(
c
)
=>
/*pula*/
iter
.
dropWhile
(
espacoLinTab
)
""
null
;
// continue
case
c
if
c
==
';'
=>
Token
(
";"
,
"pontoevirgula"
)
case
erroCh
=>
erro
(
erroCh
+
""
)
//TODO:which line error occurred?
})
})
::
tokenList
}
tokenList
=
tokenList
.
filterNot
(
_
==
null
).
reverse
println
(
tokenList
)
tokenList
}
...
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