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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,126 @@ | ||
| use std::path::PathBuf; | ||
|
|
||
| use anyhow::{anyhow, Result}; | ||
|
|
||
| use crate::{ | ||
| model::{Block, Comment}, | ||
| tokenizer::{Token, Tokenizer}, | ||
| }; | ||
|
|
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| struct Parser { | ||
| tokens: Tokenizer, | ||
| path: String, | ||
| previous_token: Option<Token>, | ||
| current_token: Option<Token>, | ||
| } | ||
|
|
||
| impl Parser { | ||
| pub fn new(path: &String) -> Result<Self> { | ||
| Ok(Self { | ||
| tokens: Tokenizer::new(PathBuf::from(path))?, | ||
| path: path.clone(), | ||
| current_token: None, | ||
| previous_token: None, | ||
| }) | ||
| } | ||
|
|
||
| fn load_next_token(&mut self) -> Result<()> { | ||
| self.previous_token = self.current_token.take(); | ||
| match self.tokens.next() { | ||
| Some(token) => self.current_token = Some(token?), | ||
| None => self.current_token = None, | ||
| } | ||
|
|
||
| Ok(()) | ||
| } | ||
|
|
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| fn error(&self, msg: &str) -> anyhow::Error { | ||
| let prefix = if let Some(curr) = &self.current_token { | ||
| curr.error_prefix(&self.path) | ||
| } else if let Some(prev) = &self.previous_token { | ||
| prev.error_prefix(&self.path) | ||
| } else { | ||
| "EOF".to_string() | ||
| }; | ||
|
|
||
| anyhow!("{}: {}", prefix, msg) | ||
| } | ||
|
|
||
| fn parse_title(&mut self) -> Result<String> { | ||
| self.load_next_token()?; | ||
| match self.current_token { | ||
| Some(Token::CommentMark(_, _)) => (), | ||
| Some(_) => return Err(self.error("Expected a title line starting with `#`")), | ||
| None => { | ||
| return Err( | ||
| self.error("Expected a title line starting with `#`, got the end of the file") | ||
| ) | ||
| } | ||
| } | ||
|
|
||
| self.load_next_token()?; | ||
| match &self.current_token { | ||
| Some(Token::Text(_, _, text)) => Ok(text.clone()), | ||
| Some(_) => Err(self.error("Expected the text of the title")), | ||
| None => Err(self.error("Expected the text of the title, got the end of the file")), | ||
| } | ||
| } | ||
|
|
||
| fn parse_description(&mut self) -> Result<Option<String>> { | ||
| self.load_next_token()?; | ||
| match self.current_token { | ||
| Some(Token::CommentMark(_, _)) => (), | ||
| Some(_) => return Ok(None), | ||
| None => return Err(self.error("Expected a descrition line starting with `#` or a variable definition, got the end of the file")), | ||
| } | ||
|
|
||
| self.load_next_token()?; | ||
| match &self.current_token { | ||
| Some(Token::Text(_, _, text)) => Ok(Some(text.clone())), | ||
| Some(_) => Err(self.error("Expected a descrition text")), | ||
| None => Err(self.error("Expected a descrition text, got the end of the file")), | ||
| } | ||
| } | ||
|
|
||
| pub fn parse(&mut self) -> Result<Vec<Block>> { | ||
| let mut blocks: Vec<Block> = vec![]; | ||
| let title = Comment::new(self.parse_title()?.as_str()); | ||
| let descrition = self | ||
| .parse_description()? | ||
| .map(|desc| Comment::new(desc.as_str())); | ||
| blocks.push(Block::new(title, descrition)); | ||
|
|
||
| Ok(blocks) | ||
| } | ||
| } | ||
|
|
||
| #[cfg(test)] | ||
| mod tests { | ||
| use super::*; | ||
|
|
||
| #[test] | ||
| fn test_parser() { | ||
| let sample = PathBuf::from(env!("CARGO_MANIFEST_DIR")) | ||
| .join(".env.sample") | ||
| .into_os_string() | ||
| .into_string(); | ||
| let parsed = Parser::new(&sample.unwrap()).unwrap().parse().unwrap(); | ||
| let got = parsed | ||
| .iter() | ||
| .map(|block| block.to_string()) | ||
| .collect::<Vec<String>>() | ||
| .join("\n"); | ||
| let expected = "# Createnv\n# This is a simple example of how Createnv works".to_string(); | ||
| assert_eq!(expected, got); | ||
| } | ||
| } | ||
| // | ||
| // TODO: remove (just written for manual tests & debug) | ||
| pub fn parser_cli(path: &String) -> Result<()> { | ||
| let mut parser = Parser::new(path)?; | ||
| for block in parser.parse()? { | ||
| println!("{block}"); | ||
| } | ||
|
|
||
| Ok(()) | ||
| } |
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