From ad231866fd627dd5c942c63039ade1dee6d632a9 Mon Sep 17 00:00:00 2001
From: Raamakrishnan <raamakrishnan1997@gmail.com>
Date: Sat, 25 Jan 2020 11:55:50 +0530
Subject: [PATCH] Moving line parser to its own mod

---
 src/line_parser.rs | 97 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100644 src/line_parser.rs

diff --git a/src/line_parser.rs b/src/line_parser.rs
new file mode 100644
index 0000000..f128639
--- /dev/null
+++ b/src/line_parser.rs
@@ -0,0 +1,97 @@
+use std::collections::HashMap;
+
+#[derive(PartialEq, Debug)]
+pub enum LineType<'a> {
+    File(&'a str),
+    IncDir(Vec<&'a str>),
+    Define(HashMap<&'a str, &'a str>),
+    Filelist(&'a str),
+    Comment,
+    // Unknown,
+}
+
+pub fn parse_line(line: &str) -> LineType {
+    let line = line.trim();
+    if line.starts_with("-f ") {
+        let filelist_name = line.trim_start_matches("-f ");
+        LineType::Filelist(filelist_name)
+    } else if line.starts_with("+define+") {
+        // remove +define+ from start and "+" from end
+        let defines = line.trim_start_matches("+define+").trim_end_matches('+');
+        let mut define_map = HashMap::new();
+        for define in defines.split('+') {
+            let split: Vec<&str> = define.splitn(2, '=').collect();
+            define_map.insert(split[0], split[1]);
+        }
+        LineType::Define(define_map)
+    } else if line.starts_with("+incdir+") {
+        // remove +incdir+ from start and "+" from end
+        let incdirs = line.trim_start_matches("+incdir+").trim_end_matches('+');
+        let incdir_vec: Vec<&str> = incdirs.split('+').collect();
+        LineType::IncDir(incdir_vec)
+    } else if line.starts_with("//") {
+        LineType::Comment
+    } else {
+        // Mark everything else as a File
+        LineType::File(line)
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn parse_line_filelist() {
+        let line = "-f sample/files.f\n";
+        assert_eq!(parse_line(line), LineType::Filelist("sample/files.f"));
+    }
+
+    #[test]
+    fn parse_line_define_single() {
+        let line = "+define+CONST1=const1=23\n";
+        let mut define_map = HashMap::new();
+        define_map.insert("CONST1", "const1=23");
+        assert_eq!(parse_line(line), LineType::Define(define_map));
+    }
+
+    #[test]
+    fn parse_line_define_multiple() {
+        let line = "+define+CONST1=const1+CONST2=const2+CONST3=const3=1+\n";
+        let mut define_map = HashMap::new();
+        define_map.insert("CONST1", "const1");
+        define_map.insert("CONST2", "const2");
+        define_map.insert("CONST3", "const3=1");
+        assert_eq!(parse_line(line), LineType::Define(define_map));
+    }
+
+    #[test]
+    fn parse_line_incdir_single() {
+        let line = "+incdir+../sample_dir1/sample_dir2\n";
+        let incdir_vec = vec!["../sample_dir1/sample_dir2"];
+        assert_eq!(parse_line(line), LineType::IncDir(incdir_vec));
+    }
+
+    #[test]
+    fn parse_line_incdir_multiple() {
+        let line = "+incdir+../sample_dir1/sample_dir2+../sample_dir2/sample_dir3+sample_dir4/sample_dir5+\n";
+        let incdir_vec = vec![
+            "../sample_dir1/sample_dir2",
+            "../sample_dir2/sample_dir3",
+            "sample_dir4/sample_dir5",
+        ];
+        assert_eq!(parse_line(line), LineType::IncDir(incdir_vec));
+    }
+
+    #[test]
+    fn parse_line_comment() {
+        let line = "//random_comment";
+        assert_eq!(parse_line(line), LineType::Comment);
+    }
+
+    #[test]
+    fn parse_line_file() {
+        let line = "any_random_line_is_a_file";
+        assert_eq!(parse_line(line), LineType::File("any_random_line_is_a_file"));
+    }
+}