essential-debugger 0.2.0

An experimental constraint debugger for the Essential constraint checking engine
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

use std::fmt::Write;

#[cfg(test)]
mod tests;

#[derive(Default, Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct Source {
    pub other: String,
    pub predicate: String,
    pub constraint_line: Option<usize>,
}

#[derive(Default, Debug, Clone, Copy)]
pub enum ShowOutput {
    All,
    Predicate,
    #[default]
    Constraint,
    ConstraintOnly,
}

pub fn show_code(source: &Option<Source>, show: ShowOutput) -> String {
    match source {
        Some(source) => match show {
            ShowOutput::All => format!(
                "{}\n{}",
                source.other,
                format_predicate(&source.predicate, &source.constraint_line)
            ),
            ShowOutput::Predicate => format_predicate(&source.predicate, &source.constraint_line),
            ShowOutput::Constraint => format_constraint(&source.predicate, &source.constraint_line),
            ShowOutput::ConstraintOnly => {
                constraint_only(&source.predicate, &source.constraint_line)
            }
        },
        None => "No source code available.".to_string(),
    }
}

impl Source {
    pub fn with_predicate(self, predicate: impl Into<String>) -> Self {
        Source {
            predicate: predicate.into(),
            ..self
        }
    }

    pub fn with_predicate_find_line(
        self,
        predicate: impl Into<String>,
        constraint_num: usize,
    ) -> Self {
        let predicate = predicate.into();
        let mut count = 0;
        let constraint_line = predicate.lines().position(|line| {
            if line.trim().starts_with("constraint ") {
                let found = count == constraint_num;
                count += 1;
                found
            } else {
                false
            }
        });
        Source {
            predicate,
            constraint_line,
            ..self
        }
    }

    pub fn with_constraint_line_number(self, constraint_line: usize) -> Self {
        Source {
            constraint_line: Some(constraint_line),
            ..self
        }
    }

    pub fn with_other_code(self, other: impl Into<String>) -> Self {
        Source {
            other: other.into(),
            ..self
        }
    }
}

fn format_predicate(predicate: &str, constraint_line: &Option<usize>) -> String {
    match constraint_line {
        Some(line_num) => predicate.lines().enumerate().fold(
            String::with_capacity(predicate.len()),
            |mut s, (i, line)| {
                if i == *line_num {
                    let _ = writeln!(s, "{}", dialoguer::console::style(line).cyan());
                } else {
                    let _ = writeln!(s, "{}", line);
                }
                s
            },
        ),
        None => predicate.to_string(),
    }
}

fn format_constraint(predicate: &str, constraint_line: &Option<usize>) -> String {
    match constraint_line {
        Some(line_num) => predicate.lines().enumerate().fold(
            String::with_capacity(predicate.len()),
            |mut s, (i, line)| {
                if i == *line_num {
                    let _ = writeln!(s, "{}", line);
                } else if line.trim().starts_with("constraint ") {
                } else {
                    let _ = writeln!(s, "{}", line);
                }
                s
            },
        ),
        None => predicate.to_string(),
    }
}

fn constraint_only(predicate: &str, constraint_line: &Option<usize>) -> String {
    match constraint_line {
        Some(line_num) => match predicate.lines().nth(*line_num) {
            Some(line) => line.trim().to_string(),
            None => predicate.to_string(),
        },
        None => predicate.to_string(),
    }
}

impl From<Option<&str>> for ShowOutput {
    fn from(value: Option<&str>) -> Self {
        match value {
            Some("a") | Some("all") => ShowOutput::All,
            Some("p") | Some("predicate") => ShowOutput::Predicate,
            Some("c") | Some("constraint") => ShowOutput::Constraint,
            Some("co") | Some("constraint only") => ShowOutput::ConstraintOnly,
            _ => ShowOutput::default(),
        }
    }
}