diff --git a/Cargo.toml b/Cargo.toml
index d788e76..392cfcf 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,7 +1,8 @@
 [workspace]
 members = [
     "sv-parser",
-    "sv-parser-syntaxtree",
-    "sv-parser-parser",
     "sv-parser-macros",
+    "sv-parser-parser",
+    "sv-parser-pp",
+    "sv-parser-syntaxtree",
 ]
diff --git a/sv-parser-pp/Cargo.toml b/sv-parser-pp/Cargo.toml
new file mode 100644
index 0000000..8eb9b76
--- /dev/null
+++ b/sv-parser-pp/Cargo.toml
@@ -0,0 +1,13 @@
+[package]
+name = "sv-parser-pp"
+version = "0.1.0"
+authors = ["dalance <dalance@gmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+nom          = "5.0.0"
+nom_locate   = "1.0.0"
+nom-tracable = "0.3.1"
+str-concat   = "0.1.4"
diff --git a/sv-parser-pp/src/lib.rs b/sv-parser-pp/src/lib.rs
new file mode 100644
index 0000000..42954fd
--- /dev/null
+++ b/sv-parser-pp/src/lib.rs
@@ -0,0 +1,100 @@
+use nom::branch::*;
+use nom::bytes::complete::*;
+use nom::character::complete::*;
+use nom::combinator::*;
+use nom::multi::*;
+use nom::sequence::*;
+use nom::IResult;
+use str_concat::concat;
+
+pub fn preprocessor_text(s: &str) -> IResult<&str, &str> {
+    alt((multispace1, comment, string_literal, other))(s)
+}
+
+fn comment(s: &str) -> IResult<&str, &str> {
+    alt((one_line_comment, block_comment))(s)
+}
+
+fn one_line_comment(s: &str) -> IResult<&str, &str> {
+    let (s, a) = tag("//")(s)?;
+    let (s, b) = is_not("\n")(s)?;
+    let a = concat(a, b).unwrap();
+    Ok((s, a))
+}
+
+fn block_comment(s: &str) -> IResult<&str, &str> {
+    let (s, a) = tag("/*")(s)?;
+    let (s, b) = is_not("*/")(s)?;
+    let (s, c) = tag("*/")(s)?;
+    let a = concat(a, b).unwrap();
+    let a = concat(a, c).unwrap();
+    Ok((s, a))
+}
+
+fn string_literal(s: &str) -> IResult<&str, &str> {
+    let (s, a) = tag("\"")(s)?;
+    let (s, b) = many0(alt((
+        is_not("\\\""),
+        map(pair(tag("\\"), take(1usize)), |(x, y)| {
+            concat(x, y).unwrap()
+        }),
+    )))(s)?;
+    let (s, c) = tag("\"")(s)?;
+
+    let mut ret = None;
+    for x in b {
+        ret = if let Some(ret) = ret {
+            Some(concat(ret, x).unwrap())
+        } else {
+            Some(x)
+        };
+    }
+
+    let a = if let Some(b) = ret {
+        let a = concat(a, b).unwrap();
+        let a = concat(a, c).unwrap();
+        a
+    } else {
+        let a = concat(a, c).unwrap();
+        a
+    };
+
+    Ok((s, a))
+}
+
+fn other(s: &str) -> IResult<&str, &str> {
+    let (s, a) = many1(alt((
+        is_not("\"`/"),
+        terminated(tag("/"), peek(not(alt((tag("/"), tag("*")))))),
+    )))(s)?;
+
+    let mut ret = None;
+    for x in a {
+        ret = if let Some(ret) = ret {
+            Some(concat(ret, x).unwrap())
+        } else {
+            Some(x)
+        };
+    }
+    let a = ret.unwrap();
+    Ok((s, a))
+}
+
+fn ws<'a, F>(f: F) -> impl Fn(&'a str) -> IResult<&'a str, &'a str>
+where
+    F: Fn(&'a str) -> IResult<&'a str, &'a str>,
+{
+    move |s: &'a str| {
+        let (s, x) = f(s)?;
+        let (s, y) = multispace0(s)?;
+        Ok((s, concat(x, y).unwrap()))
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn it_works() {
+        assert_eq!(2 + 2, 4);
+    }
+}