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
|
// Copyright (C) 2021-2022 Soni L.
// SPDX-License-Identifier: MIT OR Apache-2.0
//! Datafu Patterns.
use std::borrow::Borrow;
use std::collections::BTreeMap;
use serde::de::Deserialize;
use serde::de::DeserializeSeed as _;
use serde::de::Deserializer;
use serde::ser::Serialize;
use crate::Predicate;
use crate::errors::PatternError;
use crate::graph::Graph;
use crate::parser::parse;
use crate::vm;
use crate::vm::PatternConstants;
use crate::vm::MAX_CALLS;
/// A compiled Datafu pattern.
///
/// # Examples
///
/// ```
/// use datafu::PatternBuilder;
///
/// let pattern = PatternBuilder::for_pattern(
/// "->['value']'hello'",
/// ).compile().expect("failed to compile pattern");
/// ```
pub struct Pattern<O: Serialize> {
consts: PatternConstants<O>,
}
impl<O: Serialize> Pattern<O> {
/// Matches the pattern against an input.
pub fn deserialize<'de, Der>(
&self,
der: Der,
) -> Result<Graph<'_, 'de>, Der::Error>
where
Der: Deserializer<'de>,
{
let mut err = Default::default();
let mut frames = Default::default();
//let mut output = Default::default();
let interp = vm::Interpreter::new(
&self.consts,
&mut err,
&mut frames,
//&mut output,
);
let (mut packs, obj) = vm::Packer::new(
interp,
MAX_CALLS,
).deserialize(der)?;
// this should always be None
debug_assert!(obj.is_none());
debug_assert!(packs.len() <= 1);
let pack = packs.pop();
Ok(Graph(pack))
}
}
/// Builder for [`Pattern`].
pub struct PatternBuilder<'s, PKey=&'static str, OKey=&'static str, O=()> {
input: &'s str,
preds: Option<BTreeMap<PKey, Box<Predicate>>>,
objs: Option<BTreeMap<OKey, O>>,
}
impl<'s> PatternBuilder<'s> {
/// Creates a PatternBuilder for a given pattern.
///
/// # Examples
///
/// ```
/// use datafu::PatternBuilder;
///// use serde::Deserialize;
///// use charx;
/////
///// let preds = vec![
///// ("dict", datafu::pred(|v| { todo!() })),
///// ("str", datafu::pred(|v| { String::deserialize(v).is_ok() })),
///// ("commit", datafu::pred(|v| {
///// if let Ok(v) = String::deserialize(v) {
///// v.len() == 40 && v.trim_start_matches(
///// charx::is_ascii_hexdigit
///// ).is_empty()
///// } else {
///// false
///// }
///// })),
///// ("uri", datafu::pred(|v| { todo!() })),
///// ("bool", datafu::pred(|v| { todo!() })),
///// ].into_iter().collect();
///// let pattern = PatternBuilder::for_pattern("
///// ->'projects':$dict
///// ->commit[:?$str:?$commit]:?$dict
///// ->url[:?$str:?$uri]:?$dict
///// ->branch:?$dict
///// (->active'active'?:?$bool)
///// (->federate'federate'?:?$bool)?"
///// ).compile().expect("failed to compile pattern");
/// let pattern = PatternBuilder::for_pattern("
/// :map
/// ->['projects'?]:map
/// ->[commit:?str]:?map
/// ->[url:?str]:?map
/// ->[branch:?str]:?map
/// (->['active'?]active:?bool)?
/// (->['federate'?]?federate:?bool)?
/// (->['pinned'?]?pinned:?bool)?
/// ").compile().expect("failed to compile pattern");
/// ```
pub fn for_pattern(pattern: &'s str) -> Self {
Self {
input: pattern,
preds: None,
objs: None,
}
}
}
impl<'s, PKey, OKey, O> PatternBuilder<'s, PKey, OKey, O>
where
PKey: Borrow<str> + Ord,
OKey: Borrow<str> + Ord,
O: Serialize,
{
/// Compiles the pattern.
pub fn compile(self) -> Result<Pattern<O>, PatternError<'s>> {
Ok(Pattern {
consts: parse(self.input, self.preds, self.objs)?
})
}
}
|
