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
151
152
153
154
155

use crate::ast::definition::ArgumentsDefinition;
use crate::ast::{FromTokens, Parse, ParseError, Tokens, TryFromTokens};
use crate::lexical_token::{Name, PunctuatorType, StringValue};
use crate::{Span, HasSpan};
use bluejay_core::definition::{
    DirectiveDefinition as CoreDirectiveDefinition, DirectiveLocation as CoreDirectiveLocation,
};
use bluejay_core::AsIter;
use std::str::FromStr;

#[derive(Debug)]
pub struct DirectiveDefinition<'a> {
    description: Option<StringValue>,
    name: Name<'a>,
    arguments_definition: Option<ArgumentsDefinition<'a>>,
    is_repeatable: bool,
    locations: DirectiveLocations,
    is_builtin: bool,
}

impl<'a> CoreDirectiveDefinition for DirectiveDefinition<'a> {
    type ArgumentsDefinition = ArgumentsDefinition<'a>;
    type DirectiveLocations = DirectiveLocations;

    fn description(&self) -> Option<&str> {
        self.description.as_ref().map(AsRef::as_ref)
    }

    fn name(&self) -> &str {
        self.name.as_ref()
    }

    fn arguments_definition(&self) -> Option<&Self::ArgumentsDefinition> {
        self.arguments_definition.as_ref()
    }

    fn is_repeatable(&self) -> bool {
        self.is_repeatable
    }

    fn locations(&self) -> &Self::DirectiveLocations {
        &self.locations
    }

    fn is_builtin(&self) -> bool {
        self.is_builtin
    }
}

impl<'a> DirectiveDefinition<'a> {
    pub(crate) const DIRECTIVE_IDENTIFIER: &'static str = "directive";
    const REPEATABLE_IDENTIFIER: &'static str = "repeatable";
    const ON_IDENTIFIER: &'static str = "on";
    const SKIP_DEFINITION: &'static str =
        "directive @skip(if: Boolean!) on FIELD | FRAGMENT_SPREAD | INLINE_FRAGMENT";
    const INCLUDE_DEFINITION: &'static str =
        "directive @include(if: Boolean!) on FIELD | FRAGMENT_SPREAD | INLINE_FRAGMENT";

    fn builtin(s: &'static str) -> Self {
        let mut definition = DirectiveDefinition::parse(s).unwrap();
        definition.is_builtin = true;
        definition
    }

    pub(crate) fn skip() -> Self {
        Self::builtin(Self::SKIP_DEFINITION)
    }

    pub(crate) fn include() -> Self {
        Self::builtin(Self::INCLUDE_DEFINITION)
    }

    pub(crate) fn name(&self) -> &Name<'a> {
        &self.name
    }
}

impl<'a> FromTokens<'a> for DirectiveDefinition<'a> {
    fn from_tokens(tokens: &mut impl Tokens<'a>) -> Result<Self, ParseError> {
        let description = tokens.next_if_string_value();
        tokens.expect_name_value(Self::DIRECTIVE_IDENTIFIER)?;
        tokens.expect_punctuator(PunctuatorType::At)?;
        let name = tokens.expect_name()?;
        let arguments_definition = ArgumentsDefinition::try_from_tokens(tokens).transpose()?;
        let is_repeatable = tokens
            .next_if_name_matches(Self::REPEATABLE_IDENTIFIER)
            .is_some();
        tokens.expect_name_value(Self::ON_IDENTIFIER)?;
        let locations = DirectiveLocations::from_tokens(tokens)?;
        Ok(Self {
            description,
            name,
            arguments_definition,
            is_repeatable,
            locations,
            is_builtin: false,
        })
    }
}

#[derive(Debug)]
pub struct DirectiveLocation {
    inner: CoreDirectiveLocation,
    _span: Span,
}

impl<'a> FromTokens<'a> for DirectiveLocation {
    fn from_tokens(tokens: &mut impl Tokens<'a>) -> Result<Self, ParseError> {
        tokens.expect_name().and_then(|name| {
            CoreDirectiveLocation::from_str(name.as_ref())
                .map(|inner| Self {
                    inner,
                    _span: name.span(),
                })
                .map_err(|_| ParseError::ExpectedOneOf {
                    span: name.span(),
                    values: CoreDirectiveLocation::POSSIBLE_VALUES,
                })
        })
    }
}

impl AsRef<CoreDirectiveLocation> for DirectiveLocation {
    fn as_ref(&self) -> &CoreDirectiveLocation {
        &self.inner
    }
}

#[derive(Debug)]
#[repr(transparent)]
pub struct DirectiveLocations(Vec<DirectiveLocation>);

impl AsIter for DirectiveLocations {
    type Item = CoreDirectiveLocation;
    type Iterator<'a> = std::iter::Map<
        std::slice::Iter<'a, DirectiveLocation>,
        fn(&'a DirectiveLocation) -> &'a CoreDirectiveLocation,
    >;

    fn iter(&self) -> Self::Iterator<'_> {
        self.0.iter().map(AsRef::as_ref)
    }
}

impl<'a> FromTokens<'a> for DirectiveLocations {
    fn from_tokens(tokens: &mut impl Tokens<'a>) -> Result<Self, ParseError> {
        tokens.next_if_punctuator(PunctuatorType::Pipe);
        let mut directive_locations: Vec<DirectiveLocation> =
            vec![DirectiveLocation::from_tokens(tokens)?];
        while tokens.next_if_punctuator(PunctuatorType::Pipe).is_some() {
            directive_locations.push(DirectiveLocation::from_tokens(tokens)?);
        }
        Ok(Self(directive_locations))
    }
}