templr_parser 0.2.1

Parser for templr templates
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150

use proc_macro2::TokenStream;
use quote::ToTokens;
use syn::{
    ext::*,
    parse::{Parse, ParseStream},
    token::Brace,
    Ident, LitFloat, LitInt, LitStr, Token,
};

use crate::{Block, If, Let, Match, Name, Scope};

#[derive(Debug, Clone)]
pub enum HtmlAttrValue {
    Ident(Token![=], Ident),
    Float(Token![=], LitFloat),
    Int(Token![=], LitInt),
    Str(Token![=], LitStr),
    Block(Option<Token![?]>, Token![=], Block),
    None,
}

impl Parse for HtmlAttrValue {
    fn parse(input: ParseStream) -> syn::Result<Self> {
        if input.peek(Token![=]) {
            let eq = input.parse()?;
            let lookahead1 = input.lookahead1();
            if lookahead1.peek(LitStr) {
                Ok(Self::Str(eq, input.parse()?))
            } else if lookahead1.peek(LitInt) {
                Ok(Self::Int(eq, input.parse()?))
            } else if lookahead1.peek(LitFloat) {
                Ok(Self::Float(eq, input.parse()?))
            } else if lookahead1.peek(Ident::peek_any) {
                Ok(Self::Ident(eq, Ident::parse_any(input)?))
            } else if lookahead1.peek(Brace) {
                Ok(Self::Block(None, eq, input.parse()?))
            } else {
                Err(lookahead1.error())
            }
        } else if input.peek(Token![?]) {
            Ok(Self::Block(
                Some(input.parse()?),
                input.parse()?,
                input.parse()?,
            ))
        } else {
            Ok(Self::None)
        }
    }
}

impl ToTokens for HtmlAttrValue {
    fn to_tokens(&self, tokens: &mut TokenStream) {
        match self {
            Self::Ident(eq, slf) => {
                eq.to_tokens(tokens);
                slf.to_tokens(tokens);
            }
            Self::Str(eq, slf) => {
                eq.to_tokens(tokens);
                slf.to_tokens(tokens);
            }
            Self::Int(eq, slf) => {
                eq.to_tokens(tokens);
                slf.to_tokens(tokens);
            }
            Self::Float(eq, slf) => {
                eq.to_tokens(tokens);
                slf.to_tokens(tokens);
            }
            Self::Block(eq, toggle, slf) => {
                eq.to_tokens(tokens);
                toggle.to_tokens(tokens);
                slf.to_tokens(tokens);
            }
            Self::None => {}
        }
    }
}

#[derive(Debug, Clone)]
pub struct HtmlAttr {
    pub name: Name,
    pub value: HtmlAttrValue,
}

impl Parse for HtmlAttr {
    fn parse(input: ParseStream) -> syn::Result<Self> {
        Ok(Self {
            name: Name::parse_attr(input)?,
            value: input.parse()?,
        })
    }
}

impl ToTokens for HtmlAttr {
    fn to_tokens(&self, tokens: &mut TokenStream) {
        self.name.to_tokens(tokens);
        self.value.to_tokens(tokens);
    }
}

#[derive(Debug, Clone)]
pub enum Attr {
    Html(HtmlAttr),
    If(If<Attr>),
    Match(Match<Attr>),
    Scope(Scope<Attr>),
    Let(Let),
    Spread(Block),
}

impl Parse for Attr {
    fn parse(input: ParseStream) -> syn::Result<Self> {
        if input.peek(Token![#]) {
            let fork = input.fork();
            let _: Token![#] = fork.parse()?;

            let lookahead1 = fork.lookahead1();
            if lookahead1.peek(Token![if]) {
                Ok(Self::If(input.parse()?))
            } else if lookahead1.peek(Token![match]) {
                Ok(Self::Match(input.parse()?))
            } else if lookahead1.peek(Brace) {
                Ok(Self::Scope(input.parse()?))
            } else if lookahead1.peek(Token![let]) {
                Ok(Self::Let(input.parse()?))
            } else {
                Err(lookahead1.error())
            }
        } else if input.peek(Brace) {
            Ok(Self::Spread(input.parse()?))
        } else {
            Ok(Self::Html(input.parse()?))
        }
    }
}

impl ToTokens for Attr {
    fn to_tokens(&self, tokens: &mut TokenStream) {
        match self {
            Self::Html(slf) => slf.to_tokens(tokens),
            Self::If(slf) => slf.to_tokens(tokens),
            Self::Match(slf) => slf.to_tokens(tokens),
            Self::Scope(slf) => slf.to_tokens(tokens),
            Self::Let(slf) => slf.to_tokens(tokens),
            Self::Spread(slf) => slf.to_tokens(tokens),
        }
    }
}