Initial Commit
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1
.gitignore
vendored
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.gitignore
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|||||||
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/target
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||||||
316
Cargo.lock
generated
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316
Cargo.lock
generated
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|||||||
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||||||
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|
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|
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|
|
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|
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|
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|
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|
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|
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|
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|
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|
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|
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|
source = "registry+https://github.com/rust-lang/crates.io-index"
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|
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|
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|
dependencies = [
|
||||||
|
"winapi-i686-pc-windows-gnu",
|
||||||
|
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|
||||||
|
]
|
||||||
|
|
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|
[[package]]
|
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|
name = "winapi-i686-pc-windows-gnu"
|
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|
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|
|
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|
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|
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|
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|
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|
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|
||||||
|
|
||||||
|
[[package]]
|
||||||
|
name = "wyz"
|
||||||
|
version = "0.2.0"
|
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|
source = "registry+https://github.com/rust-lang/crates.io-index"
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|
checksum = "85e60b0d1b5f99db2556934e21937020776a5d31520bf169e851ac44e6420214"
|
||||||
11
Cargo.toml
Normal file
11
Cargo.toml
Normal file
@ -0,0 +1,11 @@
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|||||||
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[package]
|
||||||
|
name = "blueprint"
|
||||||
|
version = "0.1.0"
|
||||||
|
authors = ["Joakim Hulthe <joakim@hulthe.net>"]
|
||||||
|
description = "A simple templating library"
|
||||||
|
edition = "2018"
|
||||||
|
|
||||||
|
|
||||||
|
[dependencies]
|
||||||
|
nom = "6.1.2"
|
||||||
|
structopt = "0.3.21"
|
||||||
137
src/ast.rs
Normal file
137
src/ast.rs
Normal file
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|
|||||||
|
use std::borrow::Cow;
|
||||||
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|
||||||
|
#[derive(Debug, PartialEq)]
|
||||||
|
pub struct Template<'a> {
|
||||||
|
pub parts: Vec<Part<'a>>,
|
||||||
|
}
|
||||||
|
|
||||||
|
#[derive(Debug, PartialEq)]
|
||||||
|
pub struct IfThen<'a> {
|
||||||
|
pub cond: Expr<'a>,
|
||||||
|
pub parts: Vec<Part<'a>>,
|
||||||
|
}
|
||||||
|
|
||||||
|
#[derive(Debug, PartialEq)]
|
||||||
|
pub enum Part<'a> {
|
||||||
|
Text(Cow<'a, str>),
|
||||||
|
If {
|
||||||
|
if_then: IfThen<'a>,
|
||||||
|
elifs: Vec<IfThen<'a>>,
|
||||||
|
else_part: Option<Box<Part<'a>>>,
|
||||||
|
},
|
||||||
|
}
|
||||||
|
|
||||||
|
#[derive(Debug, PartialEq)]
|
||||||
|
pub enum CmpOp {
|
||||||
|
Eq,
|
||||||
|
NEq,
|
||||||
|
GrEq,
|
||||||
|
LeEq,
|
||||||
|
GrTh,
|
||||||
|
LeTh,
|
||||||
|
}
|
||||||
|
|
||||||
|
#[derive(Debug, PartialEq)]
|
||||||
|
pub enum Expr<'a> {
|
||||||
|
Cmp {
|
||||||
|
op: CmpOp,
|
||||||
|
expr1: Box<Expr<'a>>,
|
||||||
|
expr2: Box<Expr<'a>>,
|
||||||
|
},
|
||||||
|
|
||||||
|
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<bool> {
|
||||||
|
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))
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
10
src/env.rs
Normal file
10
src/env.rs
Normal file
@ -0,0 +1,10 @@
|
|||||||
|
use std::collections::HashMap;
|
||||||
|
|
||||||
|
pub type Env = HashMap<String, Value>;
|
||||||
|
|
||||||
|
#[derive(Clone, Debug)]
|
||||||
|
pub enum Value {
|
||||||
|
Str(String),
|
||||||
|
Bool(bool),
|
||||||
|
Null,
|
||||||
|
}
|
||||||
146
src/lib.rs
Normal file
146
src/lib.rs
Normal file
@ -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);
|
||||||
|
}
|
||||||
|
}
|
||||||
27
src/main.rs
Normal file
27
src/main.rs
Normal file
@ -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<String>,
|
||||||
|
}
|
||||||
|
|
||||||
|
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");
|
||||||
|
}
|
||||||
172
src/parser.rs
Normal file
172
src/parser.rs
Normal file
@ -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<Part>> {
|
||||||
|
//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<Template, ()> {
|
||||||
|
match parts(file) {
|
||||||
|
Ok((rest, parts)) => {
|
||||||
|
//eprintln!("{:#?}", parts);
|
||||||
|
|
||||||
|
if rest != "" {
|
||||||
|
panic!("failed to parse input. remainder: \"{}\"", rest);
|
||||||
|
}
|
||||||
|
|
||||||
|
Ok(Template { parts })
|
||||||
|
}
|
||||||
|
Err(e) => {
|
||||||
|
panic!("{:#?}", e);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
Reference in New Issue
Block a user