garnish_lang_compiler 0.0.2-alpha

Utilites to compile garnish scripts.
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

use crate::{LexerToken, SecondaryDefinition};
use std::error::Error;
use std::fmt::{Debug, Display, Formatter};

#[derive(Debug, Clone, Eq, PartialEq)]
pub struct NoSource {}

impl Display for NoSource {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        f.write_str("")
    }
}

impl std::error::Error for NoSource {}

#[derive(Debug, Clone, Eq, PartialEq)]
pub struct CompilerError<Source: 'static + std::error::Error = NoSource> {
    message: String,
    line: usize,
    column: usize,
    source: Option<Source>,
}

impl<Source: 'static + std::error::Error> CompilerError<Source> {
    pub fn new<T: ToString>(message: T, line: usize, column: usize) -> Self {
        CompilerError {
            message: message.to_string(),
            line,
            column,
            source: None,
        }
    }

    pub fn new_message(message: String) -> Self {
        CompilerError {
            message,
            line: 0,
            column: 0,
            source: None,
        }
    }

    pub fn append_token_details(mut self, token: &LexerToken) -> Self {
        self.line = token.get_line();
        self.column = token.get_column();
        self
    }

    pub fn get_message(&self) -> &String {
        &self.message
    }
}

impl<Source: 'static + std::error::Error> Default for CompilerError<Source> {
    fn default() -> Self {
        CompilerError {
            message: String::new(),
            line: 0,
            column: 0,
            source: None,
        }
    }
}

impl<Source: 'static + std::error::Error> Display for CompilerError<Source> {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        f.write_str(format!("{:?}", self).as_str())
    }
}

impl<Source: 'static + std::error::Error> std::error::Error for CompilerError<Source> {
    fn source(&self) -> Option<&(dyn Error + 'static)> {
        match &self.source {
            None => None,
            Some(s) => Some(s),
        }
    }
}

impl<Source: 'static + std::error::Error> From<Source> for CompilerError<Source> {
    fn from(source: Source) -> Self {
        let mut e = CompilerError::default();
        e.source = Some(source);
        e
    }
}

impl<Source: 'static + std::error::Error> From<CompilerError<Source>> for String {
    fn from(e: CompilerError<Source>) -> Self {
        match e.source {
            None => format!("{} at line {} col {}", e.message, e.line, e.column),
            Some(s) => format!("{} at line {} col {}", s, e.line, e.column),
        }
    }
}

// Creation utilities

pub(crate) fn composition_error<T, S: std::error::Error + 'static>(
    first: SecondaryDefinition,
    second: SecondaryDefinition,
    token: &LexerToken,
) -> Result<T, CompilerError<S>> {
    Err(CompilerError::new_message(format!("Syntax Error: A {:?} token cannot follow a {:?} token", second, first)).append_token_details(token))
}

pub(crate) fn unmatched_grouping_error<T, S: std::error::Error + 'static>(token: &LexerToken) -> Result<T, CompilerError<S>> {
    Err(CompilerError::new_message(format!("Syntax Error: Unmatched grouping token")).append_token_details(token))
}

pub(crate) fn unclosed_grouping_error<T, S: std::error::Error + 'static>(token: &LexerToken) -> Result<T, CompilerError<S>> {
    Err(CompilerError::new_message(format!("Syntax Error: Unclosed grouping")).append_token_details(token))
}

pub(crate) fn implementation_error<T, S: std::error::Error + 'static>(message: String) -> Result<T, CompilerError<S>> {
    Err(CompilerError::new_message(format!("Implementation Error: {}", message)))
}

pub(crate) fn implementation_error_with_token<T, S: std::error::Error + 'static>(message: String, token: &LexerToken) -> Result<T, CompilerError<S>> {
    append_token_details(Err(CompilerError::new_message(format!("Implementation Error: {}", message))), token)
}

pub(crate) fn append_token_details<T, S: std::error::Error + 'static>(
    result: Result<T, CompilerError<S>>,
    token: &LexerToken,
) -> Result<T, CompilerError<S>> {
    result.map_err(|e| e.append_token_details(token))
}