From 315d97b35884b10bef81c206463b40d7dcd9f716 Mon Sep 17 00:00:00 2001
From: Lilly Rosaline <lilly.rosaline@waterlilly.dev>
Date: Mon, 4 Oct 2021 22:22:41 -0500
Subject: [PATCH] began writing parser first pass

---
 src/lib.rs | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 54 insertions(+), 4 deletions(-)

diff --git a/src/lib.rs b/src/lib.rs
index ae350ca..d600349 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -6,22 +6,72 @@ mod tests {
     use crate::*;
 
     #[test]
-    fn tests() {
+    fn test_00() {
         dbg!(parse_args("Hello world", 0x00));
+    }
+    #[test]
+    fn test_01() {
         dbg!(parse_args("\"Hello world\'\"", 0x07));
     }
 }
 
 /// Parses the command line arguments into a list of parameters.
 pub fn parse_args(input: &str, mode: u8) -> Vec<String> {
-    let input: Vec<_> = input.chars().map(|arg| arg.clone()).collect();
+    let input: Vec<_> = input.chars().map(|arg| arg.clone()).collect(); // Converts from the input string to a vector of chars.
     dbg!(&input);
-
     match mode {
         /// Returns exact input string.
-        0x00 => {vec![String::from_iter(input.iter())]},
+        0x00 => {vec![String::from_iter(input.iter())]}, // Simply converts the vector of chars into a string, and puts it as the first element.
         /// Seperates all strings
         0x07 => {
+            // First pass: Quoting
+            let mut single_quote_begin: Vec<usize> = vec![]; // List of beginning single quotation marks.
+            let mut single_quote_end: Vec<usize> = vec![]; // List of ending single quotation marks.
+            let mut is_single_quoted: bool = false; // Boolean showing if the current contents are quoted.
+
+            let mut double_quote_begin: Vec<usize> = vec![]; // List of beginning double quotation marks.
+            let mut double_quote_end: Vec<usize> = vec![]; // List of ending double quotation marks.
+            let mut is_double_quoted: bool = false; // boolean showing if the current contents are quoted.
+
+            for (i, c) in input.iter().enumerate() {
+                let c = *c;
+
+
+                let escaped = if i != 0 {*input.get(i - 1).unwrap() == '\\'} else {false} // Checks if previous character is backslash (and index is not zero
+                    && if i > 1 {*input.get(i - 2).unwrap() == '\\'} else {false}; // Checks if 2 characters ago is backslash (and index is greater than 1)
+                match c {
+
+                    '\'' => { // Single quoted stuff will always be taken literally, no matter what they contain. See the bash manual§3.1.2.2.
+                        if !escaped && !is_double_quoted {
+                            if is_single_quoted {
+                                single_quote_end.push(i);
+                                is_single_quoted = false;
+                            } else {
+                                single_quote_begin.push(i);
+                                is_single_quoted = true;
+                            }
+                        }
+                    },
+                    '\"' => { // Double quoted stuff works kind of like graves do in JavaScript. See the bash manual§3.1.2.3.
+                        if !escaped && !is_single_quoted {
+                            if is_double_quoted {
+                                double_quote_end.push(i);
+                                is_double_quoted = false;
+                            } else {
+                                double_quote_begin.push(i);
+                                is_double_quoted = true;
+                            }
+                        }
+                    }
+                    _ => {}
+                }
+            }
+            if single_quote_begin.len() != single_quote_end.len() {
+                panic!("Hanging single quotation mark: {}", single_quote_begin.get(single_quote_begin.len()).unwrap_or(&0));
+            }
+            if double_quote_begin.len() != double_quote_end.len() {
+                panic!("Hanging double quotation mark: {}", double_quote_begin.get(double_quote_begin.len()).unwrap_or(&0));
+            }
             vec![]
         },
         ///