swellow 0.2.0

SQL-first migration CLI
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
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177

use crate::parser::error::ParseErrorKind;
use crate::parser::greedy_parse;
use crate::parser::dialect::*;
use crate::parser::ParseError;

use sqlparser::ast::Statement;
use sqlparser::tokenizer::{Token, Tokenizer};
use std::fmt::{self, Write};
use std::hash::{DefaultHasher, Hash, Hasher};
use std::ops::{Deref, DerefMut};


#[derive(Debug, Clone)]
pub struct ActionableStatement {
    pub tokens: Vec<Token>,
    pub statement: Statement,
}

impl ActionableStatement {
    pub fn new(dialect: ReferenceToStaticDialect, tokens: Vec<Token>) -> Result<Self, ParseError> {
        if let Some(statement) = greedy_parse(dialect, tokens.clone()) {
            Ok(ActionableStatement { tokens, statement })
        } else {
            Err(ParseError { kind: ParseErrorKind::Tokens(tokens) })
        }
    }
}

impl fmt::Display for ActionableStatement {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        let mut statement = String::new();
        
        // Print each token
        for token in self {
            write!(statement, "{}", token)?;
        }

        // Check if the statement ends with a semicolon
        let ends_with_semicolon = self
            .into_iter()
            .last()
            .is_some_and(|t| matches!(t, Token::SemiColon));

        // Write it out
        if ends_with_semicolon {
            write!(f, "{}", statement)?;
        } else {
            write!(f, "{};", statement)?;
        }
        Ok(())
    }
}

impl IntoIterator for ActionableStatement {
    type Item = Token;
    type IntoIter = std::vec::IntoIter<Token>;

    fn into_iter(self) -> Self::IntoIter {
        self.tokens.into_iter()
    }
}

impl<'a> IntoIterator for &'a ActionableStatement {
    type Item = &'a Token;
    type IntoIter = std::slice::Iter<'a, Token>;

    fn into_iter(self) -> Self::IntoIter {
        self.tokens.iter()
    }
}


#[derive(Debug, Clone)]
pub struct StatementCollection {
    inner: Vec<ActionableStatement>,
    pub dialect: ReferenceToStaticDialect,
}

impl StatementCollection {
    pub fn new(dialect: ReferenceToStaticDialect) -> Self {
        StatementCollection {
            inner: vec![],
            dialect,
        }
    }

    pub fn parse_sql(&mut self, sql: &str) -> Result<Self, ParseError> {
        let mut tokenizer = Tokenizer::new(&*self.dialect, sql);
        let tokens = tokenizer
            .tokenize()
            .map_err(|err| ParseError {
                kind: ParseErrorKind::Tokenizer(err)
            })?;

        let mut current_tokens = vec![];

        for token in tokens {
            current_tokens.push(token.clone());
            if token == Token::SemiColon {
                // Only push actionable statements
                if let Ok(stmt) = ActionableStatement::new(self.dialect, current_tokens) {
                    self.inner.push(stmt);
                }
                current_tokens = vec![]; // Reset for the next statement
            }
        }

        // Add the last statement if it doesn't end with a semicolon
        if !current_tokens.is_empty() 
            && let Ok(stmt) = ActionableStatement::new(self.dialect, current_tokens) {
                self.inner.push(stmt);
            }

        Ok(self.clone())
    }
    
    pub fn to_strings(&self) -> Vec<String> {
        self.iter()
            .map(|stmt| stmt.into_iter().map(Token::to_string).collect())
            .collect()
    }

    pub fn checksum(&self) -> u64 {
        let mut hasher = DefaultHasher::new();
        for tokens in self.iter() {
            for token in tokens {
                token.hash(&mut hasher);
            }
        }
        hasher.finish()
    }
}

impl IntoIterator for StatementCollection {
    type Item = ActionableStatement;
    type IntoIter = std::vec::IntoIter<ActionableStatement>;

    fn into_iter(self) -> Self::IntoIter {
        self.inner.into_iter()
    }
}

impl<'a> IntoIterator for &'a StatementCollection {
    type Item = &'a ActionableStatement;
    type IntoIter = std::slice::Iter<'a, ActionableStatement>;

    fn into_iter(self) -> Self::IntoIter {
        self.inner.iter()
    }
}

impl Deref for StatementCollection {
    type Target = Vec<ActionableStatement>;
    fn deref(&self) -> &Self::Target {
        &self.inner
    }
}

impl DerefMut for StatementCollection {
    fn deref_mut(&mut self) -> &mut Self::Target {
        &mut self.inner
    }
}

impl fmt::Display for StatementCollection {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        let mut output = String::new();

        for statement in self {
            write!(output, "{}", statement)?;
        }

        write!(f, "{}", output)?;

        Ok(())
    }
}