From e40e93796f45d34d038c6a20c4b034eb3b384b12 Mon Sep 17 00:00:00 2001
From: Dirkjan Ochtman <dirkjan@ochtman.nl>
Date: Sat, 1 Jul 2023 16:00:06 +0200
Subject: Extract askama_parser crate

---
 askama_derive/src/parser/expr.rs | 285 ---------------------------------------
 1 file changed, 285 deletions(-)
 delete mode 100644 askama_derive/src/parser/expr.rs

(limited to 'askama_derive/src/parser/expr.rs')

diff --git a/askama_derive/src/parser/expr.rs b/askama_derive/src/parser/expr.rs
deleted file mode 100644
index deefb48..0000000
--- a/askama_derive/src/parser/expr.rs
+++ /dev/null
@@ -1,285 +0,0 @@
-use std::str;
-
-use nom::branch::alt;
-use nom::bytes::complete::{tag, take_till};
-use nom::character::complete::char;
-use nom::combinator::{cut, map, not, opt, peek, recognize};
-use nom::error::ErrorKind;
-use nom::multi::{fold_many0, many0, separated_list0, separated_list1};
-use nom::sequence::{delimited, pair, preceded, terminated, tuple};
-use nom::{error_position, IResult};
-
-use super::{
-    bool_lit, char_lit, identifier, nested_parenthesis, not_ws, num_lit, path, str_lit, ws,
-};
-
-#[derive(Debug, PartialEq)]
-pub(crate) enum Expr<'a> {
-    BoolLit(&'a str),
-    NumLit(&'a str),
-    StrLit(&'a str),
-    CharLit(&'a str),
-    Var(&'a str),
-    Path(Vec<&'a str>),
-    Array(Vec<Expr<'a>>),
-    Attr(Box<Expr<'a>>, &'a str),
-    Index(Box<Expr<'a>>, Box<Expr<'a>>),
-    Filter(&'a str, Vec<Expr<'a>>),
-    Unary(&'a str, Box<Expr<'a>>),
-    BinOp(&'a str, Box<Expr<'a>>, Box<Expr<'a>>),
-    Range(&'a str, Option<Box<Expr<'a>>>, Option<Box<Expr<'a>>>),
-    Group(Box<Expr<'a>>),
-    Tuple(Vec<Expr<'a>>),
-    Call(Box<Expr<'a>>, Vec<Expr<'a>>),
-    RustMacro(Vec<&'a str>, &'a str),
-    Try(Box<Expr<'a>>),
-}
-
-impl Expr<'_> {
-    pub(super) fn parse(i: &str) -> IResult<&str, Expr<'_>> {
-        expr_any(i)
-    }
-
-    pub(super) fn parse_arguments(i: &str) -> IResult<&str, Vec<Expr<'_>>> {
-        arguments(i)
-    }
-}
-
-fn expr_bool_lit(i: &str) -> IResult<&str, Expr<'_>> {
-    map(bool_lit, Expr::BoolLit)(i)
-}
-
-fn expr_num_lit(i: &str) -> IResult<&str, Expr<'_>> {
-    map(num_lit, Expr::NumLit)(i)
-}
-
-fn expr_array_lit(i: &str) -> IResult<&str, Expr<'_>> {
-    delimited(
-        ws(char('[')),
-        map(separated_list1(ws(char(',')), expr_any), Expr::Array),
-        ws(char(']')),
-    )(i)
-}
-
-fn expr_str_lit(i: &str) -> IResult<&str, Expr<'_>> {
-    map(str_lit, Expr::StrLit)(i)
-}
-
-fn expr_char_lit(i: &str) -> IResult<&str, Expr<'_>> {
-    map(char_lit, Expr::CharLit)(i)
-}
-
-fn expr_var(i: &str) -> IResult<&str, Expr<'_>> {
-    map(identifier, Expr::Var)(i)
-}
-
-fn expr_path(i: &str) -> IResult<&str, Expr<'_>> {
-    let (i, path) = path(i)?;
-    Ok((i, Expr::Path(path)))
-}
-
-fn expr_group(i: &str) -> IResult<&str, Expr<'_>> {
-    let (i, expr) = preceded(ws(char('(')), opt(expr_any))(i)?;
-    let expr = match expr {
-        Some(expr) => expr,
-        None => {
-            let (i, _) = char(')')(i)?;
-            return Ok((i, Expr::Tuple(vec![])));
-        }
-    };
-
-    let (i, comma) = ws(opt(peek(char(','))))(i)?;
-    if comma.is_none() {
-        let (i, _) = char(')')(i)?;
-        return Ok((i, Expr::Group(Box::new(expr))));
-    }
-
-    let mut exprs = vec![expr];
-    let (i, _) = fold_many0(
-        preceded(char(','), ws(expr_any)),
-        || (),
-        |_, expr| {
-            exprs.push(expr);
-        },
-    )(i)?;
-    let (i, _) = pair(ws(opt(char(','))), char(')'))(i)?;
-    Ok((i, Expr::Tuple(exprs)))
-}
-
-fn expr_single(i: &str) -> IResult<&str, Expr<'_>> {
-    alt((
-        expr_bool_lit,
-        expr_num_lit,
-        expr_str_lit,
-        expr_char_lit,
-        expr_path,
-        expr_array_lit,
-        expr_var,
-        expr_group,
-    ))(i)
-}
-
-enum Suffix<'a> {
-    Attr(&'a str),
-    Index(Expr<'a>),
-    Call(Vec<Expr<'a>>),
-    // The value is the arguments of the macro call.
-    MacroCall(&'a str),
-    Try,
-}
-
-fn expr_attr(i: &str) -> IResult<&str, Suffix<'_>> {
-    map(
-        preceded(
-            ws(pair(char('.'), not(char('.')))),
-            cut(alt((num_lit, identifier))),
-        ),
-        Suffix::Attr,
-    )(i)
-}
-
-fn expr_index(i: &str) -> IResult<&str, Suffix<'_>> {
-    map(
-        preceded(ws(char('[')), cut(terminated(expr_any, ws(char(']'))))),
-        Suffix::Index,
-    )(i)
-}
-
-fn expr_call(i: &str) -> IResult<&str, Suffix<'_>> {
-    map(arguments, Suffix::Call)(i)
-}
-
-fn expr_macro(i: &str) -> IResult<&str, Suffix<'_>> {
-    preceded(
-        pair(ws(char('!')), char('(')),
-        cut(terminated(
-            map(recognize(nested_parenthesis), Suffix::MacroCall),
-            char(')'),
-        )),
-    )(i)
-}
-
-fn expr_try(i: &str) -> IResult<&str, Suffix<'_>> {
-    map(preceded(take_till(not_ws), char('?')), |_| Suffix::Try)(i)
-}
-
-fn filter(i: &str) -> IResult<&str, (&str, Option<Vec<Expr<'_>>>)> {
-    let (i, (_, fname, args)) = tuple((char('|'), ws(identifier), opt(arguments)))(i)?;
-    Ok((i, (fname, args)))
-}
-
-fn expr_filtered(i: &str) -> IResult<&str, Expr<'_>> {
-    let (i, (obj, filters)) = tuple((expr_prefix, many0(filter)))(i)?;
-
-    let mut res = obj;
-    for (fname, args) in filters {
-        res = Expr::Filter(fname, {
-            let mut args = match args {
-                Some(inner) => inner,
-                None => Vec::new(),
-            };
-            args.insert(0, res);
-            args
-        });
-    }
-
-    Ok((i, res))
-}
-
-fn expr_prefix(i: &str) -> IResult<&str, Expr<'_>> {
-    let (i, (ops, mut expr)) = pair(many0(ws(alt((tag("!"), tag("-"))))), expr_suffix)(i)?;
-    for op in ops.iter().rev() {
-        expr = Expr::Unary(op, Box::new(expr));
-    }
-    Ok((i, expr))
-}
-
-fn expr_suffix(i: &str) -> IResult<&str, Expr<'_>> {
-    let (mut i, mut expr) = expr_single(i)?;
-    loop {
-        let (j, suffix) = opt(alt((
-            expr_attr, expr_index, expr_call, expr_try, expr_macro,
-        )))(i)?;
-        match suffix {
-            Some(Suffix::Attr(attr)) => expr = Expr::Attr(expr.into(), attr),
-            Some(Suffix::Index(index)) => expr = Expr::Index(expr.into(), index.into()),
-            Some(Suffix::Call(args)) => expr = Expr::Call(expr.into(), args),
-            Some(Suffix::Try) => expr = Expr::Try(expr.into()),
-            Some(Suffix::MacroCall(args)) => match expr {
-                Expr::Path(path) => expr = Expr::RustMacro(path, args),
-                Expr::Var(name) => expr = Expr::RustMacro(vec![name], args),
-                _ => return Err(nom::Err::Failure(error_position!(i, ErrorKind::Tag))),
-            },
-            None => break,
-        }
-        i = j;
-    }
-    Ok((i, expr))
-}
-
-macro_rules! expr_prec_layer {
-    ( $name:ident, $inner:ident, $op:expr ) => {
-        fn $name(i: &str) -> IResult<&str, Expr<'_>> {
-            let (i, left) = $inner(i)?;
-            let (i, right) = many0(pair(
-                ws(tag($op)),
-                $inner,
-            ))(i)?;
-            Ok((
-                i,
-                right.into_iter().fold(left, |left, (op, right)| {
-                    Expr::BinOp(op, Box::new(left), Box::new(right))
-                }),
-            ))
-        }
-    };
-    ( $name:ident, $inner:ident, $( $op:expr ),+ ) => {
-        fn $name(i: &str) -> IResult<&str, Expr<'_>> {
-            let (i, left) = $inner(i)?;
-            let (i, right) = many0(pair(
-                ws(alt(($( tag($op) ),+,))),
-                $inner,
-            ))(i)?;
-            Ok((
-                i,
-                right.into_iter().fold(left, |left, (op, right)| {
-                    Expr::BinOp(op, Box::new(left), Box::new(right))
-                }),
-            ))
-        }
-    }
-}
-
-expr_prec_layer!(expr_muldivmod, expr_filtered, "*", "/", "%");
-expr_prec_layer!(expr_addsub, expr_muldivmod, "+", "-");
-expr_prec_layer!(expr_shifts, expr_addsub, ">>", "<<");
-expr_prec_layer!(expr_band, expr_shifts, "&");
-expr_prec_layer!(expr_bxor, expr_band, "^");
-expr_prec_layer!(expr_bor, expr_bxor, "|");
-expr_prec_layer!(expr_compare, expr_bor, "==", "!=", ">=", ">", "<=", "<");
-expr_prec_layer!(expr_and, expr_compare, "&&");
-expr_prec_layer!(expr_or, expr_and, "||");
-
-fn expr_any(i: &str) -> IResult<&str, Expr<'_>> {
-    let range_right = |i| pair(ws(alt((tag("..="), tag("..")))), opt(expr_or))(i);
-    alt((
-        map(range_right, |(op, right)| {
-            Expr::Range(op, None, right.map(Box::new))
-        }),
-        map(
-            pair(expr_or, opt(range_right)),
-            |(left, right)| match right {
-                Some((op, right)) => Expr::Range(op, Some(Box::new(left)), right.map(Box::new)),
-                None => left,
-            },
-        ),
-    ))(i)
-}
-
-fn arguments(i: &str) -> IResult<&str, Vec<Expr<'_>>> {
-    delimited(
-        ws(char('(')),
-        separated_list0(char(','), ws(expr_any)),
-        ws(char(')')),
-    )(i)
-}
-- 
cgit