Parsed a character

.gitignore

+/target

Cargo.lock

+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "rustec"
+version = "0.1.0"

Cargo.toml

+[package]
+name = "rustec"
+version = "0.1.0"
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

src/examples/example_programs/character.txt

+a
\ No newline at end of file

src/main.rs

+use std::env;
+use std::fs;
+
+mod parser_impls;
+use parser_impls::chars::CharacterParser;
+
+mod parser;
+use parser::parser::Parser;
+
+fn main() {
+    let source = "src/examples/example_programs/character.txt";
+    let file = fs::read_to_string(source).expect("File was not found or could not be read");
+    let parse_a = CharacterParser{};
+    let res = Parser::parse(&parse_a, file);
+
+    print!("{:#?}", res);
+
+}

src/parser/mod.rs

+pub mod parser;
+
+pub(crate) struct Context {
+    pub row: usize,
+    pub col: usize,
+}

src/parser/parser.rs

+
+use super::Context;
+pub(crate) trait Parser {
+
+    // The parsing function resturns a tuple (Parsed, Rest) or an Error String
+    fn parse_fun(&self, input: String, ctx: &mut Context) -> Result<(String, String), String>;
+
+    fn parse(&self, input: String) -> Result<(String,String) , String> {
+        let mut ctx = Context{
+            row: 0,
+            col: 0
+        };
+        self.parse_fun(input, &mut ctx)
+    }
+}
\ No newline at end of file

src/parser_impls/chars.rs

+use crate::Parser;
+use crate::parser::Context;
+
+pub(crate) struct CharacterParser;
+
+impl Parser for CharacterParser {
+
+    fn parse_fun(&self, input: String, ctx: &mut Context) -> Result<(String, String), String> {
+        if input.len() == 0 {
+            return Err("Empty string".to_owned());
+        }
+        let first = &input[..1];
+        let rest = &input[1..];
+        return Ok((first.to_owned(), rest.to_owned()));
+    }
+
+}

src/parser_impls/mod.rs

+pub mod chars;
\ No newline at end of file