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"registry+https://github.com/rust-lang/crates.io-index" +checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f" + +[[package]] +name = "wyz" +version = "0.2.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "85e60b0d1b5f99db2556934e21937020776a5d31520bf169e851ac44e6420214" diff --git a/Cargo.toml b/Cargo.toml new file mode 100644 index 0000000..f3c5e9a --- /dev/null +++ b/Cargo.toml @@ -0,0 +1,11 @@ +[package] +name = "blueprint" +version = "0.1.0" +authors = ["Joakim Hulthe "] +description = "A simple templating library" +edition = "2018" + + +[dependencies] +nom = "6.1.2" +structopt = "0.3.21" diff --git a/src/ast.rs b/src/ast.rs new file mode 100644 index 0000000..5c21540 --- /dev/null +++ b/src/ast.rs @@ -0,0 +1,137 @@ +use std::borrow::Cow; + +#[derive(Debug, PartialEq)] +pub struct Template<'a> { + pub parts: Vec>, +} + +#[derive(Debug, PartialEq)] +pub struct IfThen<'a> { + pub cond: Expr<'a>, + pub parts: Vec>, +} + +#[derive(Debug, PartialEq)] +pub enum Part<'a> { + Text(Cow<'a, str>), + If { + if_then: IfThen<'a>, + elifs: Vec>, + else_part: Option>>, + }, +} + +#[derive(Debug, PartialEq)] +pub enum CmpOp { + Eq, + NEq, + GrEq, + LeEq, + GrTh, + LeTh, +} + +#[derive(Debug, PartialEq)] +pub enum Expr<'a> { + Cmp { + op: CmpOp, + expr1: Box>, + expr2: Box>, + }, + + Variable(Cow<'a, str>), +} + +use crate::env::{Env, Value}; +use std::io::{self, Write}; + +impl Template<'_> { + pub fn write(&self, env: &Env, w: &mut impl Write) -> io::Result<()> { + for part in &self.parts { + part.write(env, w)?; + } + Ok(()) + } +} + +impl Part<'_> { + pub fn write(&self, env: &Env, w: &mut impl Write) -> io::Result<()> { + match self { + Part::Text(text) => w.write_all(text.as_bytes())?, + Part::If { + if_then, + elifs, + else_part, + } => { + if if_then.write(env, w)? { + return Ok(()); + } + + for elif in elifs { + if elif.write(env, w)? { + return Ok(()); + } + } + + if let Some(else_part) = else_part { + else_part.write(env, w)?; + } + } + } + Ok(()) + } +} + +impl IfThen<'_> { + pub fn write(&self, env: &Env, w: &mut impl Write) -> io::Result { + let cond = self.cond.eval(env); + let cond = match &*cond { + &Value::Bool(cond) => cond, + Value::Str(_) => true, + Value::Null => false, + }; + + if cond { + for part in &self.parts { + part.write(env, w)?; + } + } + + Ok(cond) + } +} + +impl Expr<'_> { + pub fn eval<'a>(&self, env: &'a Env) -> Cow<'a, Value> { + match self { + Expr::Variable(var) => Cow::Borrowed(env.get(&**var).unwrap_or(&Value::Null)), + Expr::Cmp { op, expr1, expr2 } => { + let val1 = expr1.eval(env); + let val2 = expr2.eval(env); + + let result = match (&*val1, &*val2) { + (_, Value::Null) | (Value::Null, _) => false, + (Value::Bool(b1), Value::Bool(b2)) => match op { + CmpOp::Eq => b1 == b2, + CmpOp::NEq => b1 != b2, + _ => panic!("bools cannot be ordered"), + }, + (Value::Str(s1), Value::Str(s2)) => match op { + CmpOp::Eq => s1 == s2, + CmpOp::NEq => s1 != s2, + CmpOp::GrEq => s1 >= s2, + CmpOp::LeEq => s1 <= s2, + CmpOp::GrTh => s1 > s2, + CmpOp::LeTh => s1 < s2, + }, + _ => panic!( + "invalid {:?}, {:?} and {:?} can't be compared", + op, val1, val2 + ), + }; + + Cow::Owned(Value::Bool(result)) + } + } + } +} diff --git a/src/env.rs b/src/env.rs new file mode 100644 index 0000000..d48a092 --- /dev/null +++ b/src/env.rs @@ -0,0 +1,10 @@ +use std::collections::HashMap; + +pub type Env = HashMap; + +#[derive(Clone, Debug)] +pub enum Value { + Str(String), + Bool(bool), + Null, +} diff --git a/src/lib.rs b/src/lib.rs new file mode 100644 index 0000000..fbeed9c --- /dev/null +++ b/src/lib.rs @@ -0,0 +1,146 @@ +mod ast; +mod env; +mod parser; + +pub use ast::{CmpOp, Expr, IfThen, Part, Template}; +pub use env::{Env, Value}; +pub use parser::parse_file; + +#[cfg(test)] +mod test { + use super::*; + + #[test] + fn test_parse_empty() { + let input = ""; + let ast = parse_file(&input).expect("failed to parse"); + eprintln!("{:#?}", ast); + assert_eq!(ast, Template { parts: vec![] }); + } + + #[test] + fn test_parse_text() { + let input = "hello there GENERAL KENOBI"; + let ast = parse_file(&input).expect("failed to parse"); + eprintln!("{:#?}", ast); + assert_eq!( + ast, + Template { + parts: vec![Part::Text(input.into())] + } + ); + } + + #[test] + fn test_parse_if() { + let input = "one {% if foo %} two {% end %} three"; + let ast = parse_file(&input).expect("failed to parse"); + eprintln!("{:#?}", ast); + assert_eq!( + ast, + Template { + parts: vec![ + Part::Text("one ".into()), + Part::If { + if_then: IfThen { + cond: Expr::Variable("foo".into()), + parts: vec![Part::Text(" two ".into()),] + }, + elifs: vec![], + else_part: None, + }, + Part::Text(" three".into()), + ], + } + ); + } + + #[test] + fn test_parse_eq() { + let input = "one {% if foo == bar %} two {% end %} three"; + let ast = parse_file(&input).expect("failed to parse"); + eprintln!("{:#?}", ast); + assert_eq!( + ast, + Template { + parts: vec![ + Part::Text("one ".into()), + Part::If { + if_then: IfThen { + cond: Expr::Cmp { + op: CmpOp::Eq, + expr1: Box::new(Expr::Variable("foo".into())), + expr2: Box::new(Expr::Variable("bar".into())), + }, + parts: vec![Part::Text(" two ".into()),] + }, + elifs: vec![], + else_part: None, + }, + Part::Text(" three".into()), + ], + } + ); + } + + #[test] + fn test_parse_if_elif_else() { + let input = "one {% if foo %} two {% elif bar %} three {% else %} four {% end %} five"; + let ast = parse_file(&input).expect("failed to parse"); + eprintln!("{:#?}", ast); + assert_eq!( + ast, + Template { + parts: vec![ + Part::Text("one ".into()), + Part::If { + if_then: IfThen { + cond: Expr::Variable("foo".into()), + parts: vec![Part::Text(" two ".into()),] + }, + elifs: vec![IfThen { + cond: Expr::Variable("bar".into()), + parts: vec![Part::Text(" three ".into()),] + }], + else_part: Some(Box::new(Part::Text(" four ".into()))), + }, + Part::Text(" five".into()), + ], + } + ); + } + + #[test] + fn test_parse_nested() { + let input = "one {% if foo %} two {% if bar %} three {% end %} four {% end %} five"; + let ast = parse_file(&input).expect("failed to parse"); + eprintln!("{:#?}", ast); + let expected = Template { + parts: vec![ + Part::Text("one ".into()), + Part::If { + if_then: IfThen { + cond: Expr::Variable("foo".into()), + parts: vec![ + Part::Text(" two ".into()), + Part::If { + if_then: IfThen { + cond: Expr::Variable("bar".into()), + parts: vec![Part::Text(" three ".into())], + }, + elifs: vec![], + else_part: None, + }, + Part::Text(" four ".into()), + ], + }, + elifs: vec![], + else_part: None, + }, + Part::Text(" five".into()), + ], + }; + + assert_eq!(ast, expected); + } +} diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..ca84e7c --- /dev/null +++ b/src/main.rs @@ -0,0 +1,27 @@ +use blueprint::Value; +use std::fs::read_to_string; +use std::io; +use std::path::PathBuf; +use structopt::StructOpt; + +#[derive(StructOpt)] +struct Opt { + template: PathBuf, + env: Vec, +} + +fn main() { + let opt = Opt::from_args(); + let file = read_to_string(&opt.template).expect("failed to load file"); + let template = blueprint::parse_file(&file).expect("failed to parse"); + let env = opt + .env + .into_iter() + .map(|key| (key, Value::Str("".into()))) + .collect(); + + let mut stdout = io::stdout(); + template + .write(&env, &mut stdout) + .expect("failed to write output"); +} diff --git a/src/parser.rs b/src/parser.rs new file mode 100644 index 0000000..7193740 --- /dev/null +++ b/src/parser.rs @@ -0,0 +1,172 @@ +use crate::ast::*; +use nom::{ + branch::alt, + bytes::complete::{tag, take_until}, + character::complete::{alpha1, multispace0, multispace1}, + combinator::{map, opt}, + multi::many0, + sequence::tuple, + IResult, +}; +use std::borrow::Cow; + +/// Try to parse an Expr::Variable +fn expr_var(i: &str) -> IResult<&str, Expr> { + //eprintln!("expr_var \"{}\"", i); + // TODO: allow numbers? + map(alpha1, |v| Expr::Variable(Cow::Borrowed(v)))(i) +} + +fn expr1(i: &str) -> IResult<&str, Expr> { + expr_var(i) +} + +fn cmp_op(i: &str) -> IResult<&str, CmpOp> { + //eprintln!("cmp_op \"{}\"", i); + alt(( + map(tag("=="), |_| CmpOp::Eq), + map(tag("!="), |_| CmpOp::NEq), + map(tag(">="), |_| CmpOp::GrEq), + map(tag("<="), |_| CmpOp::LeEq), + map(tag("<"), |_| CmpOp::LeTh), + map(tag(">"), |_| CmpOp::GrTh), + ))(i) +} + +fn expr_cmp(i: &str) -> IResult<&str, Expr> { + //eprintln!("expr_cmp \"{}\"", i); + let (i, e1) = expr1(i)?; + let (i, _) = multispace0(i)?; + let (i, op) = cmp_op(i)?; + let (i, _) = multispace0(i)?; + let (i, e2) = expr(i)?; + + let expr = Expr::Cmp { + op, + expr1: Box::new(e1), + expr2: Box::new(e2), + }; + + Ok((i, expr)) +} + +fn expr(i: &str) -> IResult<&str, Expr> { + //eprintln!("expr \"{}\"", i); + let (i, _) = multispace0(i)?; + + let (i, expr) = alt((expr_cmp, expr1))(i)?; + + let (i, _) = multispace0(i)?; + + Ok((i, expr)) +} + +fn part(i: &str) -> IResult<&str, Part> { + //eprintln!("part \"{}\"", i); + alt((if_part, text_part))(i) +} + +fn parts(i: &str) -> IResult<&str, Vec> { + //eprintln!("partS \"{}\"", i); + many0(part)(i) +} + +fn text_part(i: &str) -> IResult<&str, Part> { + //eprintln!("text_part 1 \"{}\"", i); + let r: IResult<_, _> = take_until("{%")(i); + //eprintln!("text_part 2 \"{}\"", i); + let (i, o) = r.unwrap_or(("", i)); + //eprintln!("text_part 3 \"{}\"", i); + if o == "" { + //eprintln!("text_part 4A \"{}\"", i); + Err(nom::Err::Error(nom::error::Error::new( + i, + nom::error::ErrorKind::TakeUntil, + ))) + } else { + //eprintln!("text_part 4B \"{}\"", i); + Ok((i, Part::Text(Cow::Borrowed(o)))) + } +} + +fn if_part(i: &str) -> IResult<&str, Part> { + //eprintln!("if_part 1 \"{}\"", i); + let (i, if_cond) = if_block(i)?; + //eprintln!("if_part 2 \"{}\"", i); + let (i, if_parts) = parts(i)?; + //eprintln!("if_part 3 \"{}\"", i); + let (i, elifs) = many0(map(tuple((elif_block, parts)), |(cond, parts)| IfThen { + cond, + parts, + }))(i)?; + //eprintln!("if_part 4 \"{}\"", i); + let (i, el) = opt(tuple((block("else"), part)))(i)?; + //eprintln!("if_part 5 \"{}\"", i); + let (i, _) = block("end")(i)?; + //eprintln!("if_part 6 \"{}\"", i); + + let if_then = IfThen { + cond: if_cond, + parts: if_parts, + }; + + let else_part = el.map(|(_, part)| Box::new(part)); + + Ok(( + i, + Part::If { + if_then, + elifs, + else_part, + }, + )) +} + +fn if_block(i: &str) -> IResult<&str, Expr> { + //eprintln!("if_block \"{}\"", i); + let (i, _) = tag("{%")(i)?; + let (i, _) = multispace1(i)?; + let (i, _) = tag("if")(i)?; + let (i, expr) = expr(i)?; + let (i, _) = tag("%}")(i)?; + Ok((i, expr)) +} + +fn elif_block(i: &str) -> IResult<&str, Expr> { + //eprintln!("elif_block \"{}\"", i); + let (i, _) = tag("{%")(i)?; + let (i, _) = multispace1(i)?; + let (i, _) = tag("elif")(i)?; + let (i, expr) = expr(i)?; + let (i, _) = tag("%}")(i)?; + Ok((i, expr)) +} + +fn block(word: &'static str) -> impl Fn(&str) -> IResult<&str, ()> { + move |i: &str| { + //eprintln!("{}_block \"{}\"", word, i); + let (i, _) = tag("{%")(i)?; + let (i, _) = multispace1(i)?; + let (i, _) = tag(word)(i)?; + let (i, _) = multispace1(i)?; + let (i, _) = tag("%}")(i)?; + Ok((i, ())) + } +} + +pub fn parse_file(file: &str) -> Result { + match parts(file) { + Ok((rest, parts)) => { + //eprintln!("{:#?}", parts); + + if rest != "" { + panic!("failed to parse input. remainder: \"{}\"", rest); + } + + Ok(Template { parts }) + } + Err(e) => { + panic!("{:#?}", e); + } + } +}