orql 0.1.0

A toy SQL parser for a subset of the Oracle dialect.
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
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

#[test]
fn test_binary_operator_precedence() {
    assert_sql!(expr("1 * 2 + 3"), debug("{{1 * 2} + 3}"));
    assert_sql!(expr("1 / 2 + 3"), debug("{{1 / 2} + 3}"));
    assert_sql!(expr("1 + 2 * 3"), debug("{1 + {2 * 3}}"));
    assert_sql!(expr("1 + 2 / 3"), debug("{1 + {2 / 3}}"));
    assert_sql!(expr("1 + 2 + 3"), debug("{{1 + 2} + 3}"));
    assert_sql!(expr("1 * 2 * 3"), debug("{{1 * 2} * 3}"));
    assert_sql!(expr("1 * 2 / 3"), debug("{{1 * 2} / 3}"));
    assert_sql!(expr("1 / 2 * 3"), debug("{{1 / 2} * 3}"));
    assert_sql!(expr("1 / 2 + 3 * 4"), debug("{{1 / 2} + {3 * 4}}"));

    // ~ the `||` operator the same precedence as `+` or `-` ...
    assert_sql!(expr("1 + 2 || 3"), debug("{{1 + 2} || 3}"));
    // ... and has lower precedence as `*` or `/`
    assert_sql!(expr("1 / 2 || 3"), debug("{{1 / 2} || 3}"));
    assert_sql!(expr("1 || 2 / 3"), debug("{1 || {2 / 3}}"));
}

#[test]
fn test_unary_operator_precedence() {
    assert_sql!(expr("+1"), debug("{+1}"));
    assert_sql!(expr("-1"), debug("{-1}"));
    assert_sql!(expr("-1 + 2"), debug("{{-1} + 2}"));
    assert_sql!(expr("1 + +2 * ?"), debug("{1 + {{+2} * ?}}"));
    assert_sql!(expr("1 + +2"), debug("{1 + {+2}}"));
    assert_sql!(expr("1 + -2 * ?"), debug("{1 + {{-2} * ?}}"));
}

#[test]
fn test_identifiers() {
    assert_sql!(expr(r#"abc"#), "abc");
    assert_sql!(expr(r#"abc.def"#), "abc.def");
    assert_sql!(expr(r#"abc . def"#), "abc.def");
    // ~ quoted select is not considered a keyword
    assert_sql!(expr(r#"abc . "SELECT""#), r#"abc."SELECT""#);
    // ~ dot has highest precedence
    assert_sql!(
        expr(r#"abc + -def.ghi * 123"#),
        debug("{{abc} + {{-{def.ghi}} * 123}}")
    );
}

#[test]
fn test_null() {
    assert_sql!(expr("null"), "NULL");
    assert_sql!(expr("q'|abc|' || null"), debug("{Q'|abc|' || NULL}"));
}

#[test]
fn test_nested_exprs() {
    assert_sql!(expr(r#"(1)"#), debug("(1)"));
    assert_sql!(expr(r#"(((1)))"#), debug("(((1)))"));
    assert_sql!(expr("1 * (2 + 3)"), debug("{1 * ({2 + 3})}"));

    assert_sql!(expr("(1) * 2"), debug("{(1) * 2}"));
    assert_sql!(
        expr("1) * 2"),
        "Unbalanced parentheses [line: 1, column: 2]"
    );
    assert_sql!(
        expr("(1)) * 2"),
        "Unbalanced parentheses [line: 1, column: 4]"
    );

    assert_sql!(expr("((1 + (2)) * 3)"), debug("({({1 + (2)}) * 3})"));

    assert_sql!(expr("(1 * (2 + (3)))"), debug("({1 * ({2 + (3)})})"));
    assert_sql!(
        expr("(1 * (2 + (3))"),
        "Unexpected end-of-file; expected a closing parenthesis [line: 1, column: 15]"
    );
}

#[test]
fn test_function_calls_0() {
    assert_sql!(expr("foo(/* no arguments */)"), debug("{{foo}()}"));
    assert_sql!(
        expr("foo(/* no arguments */)"),
        debug(with_meta("{{foo}( /* no arguments */ )}"))
    );
    assert_sql!(expr("foo(1)"), debug("{{foo}(1)}"));
    assert_sql!(expr("foo((1))"), debug("{{foo}((1))}"));
}

#[test]
fn test_function_calls_1() {
    assert_sql!(expr("foo(1, 'a')"), debug("{{foo}(1, 'a')}"));
    assert_sql!(
        expr("foo(1, 'a', bar(2, 'b', quux()))"),
        debug("{{foo}(1, 'a', {{bar}(2, 'b', {{quux}()})})}")
    );
}

#[test]
fn test_case_exprs_simple() {
    assert_sql!(
        expr("case 1 when 0 then 'yes' end"),
        debug("{CASE 1 {WHEN 0 THEN 'yes'} END}")
    );
    assert_sql!(
        expr("case x when 0 then 'yes' end"),
        debug("{CASE {x} {WHEN 0 THEN 'yes'} END}")
    );
    assert_sql!(
        expr("case 1 when 0 then 'yes' else 'maybe' end"),
        debug("{CASE 1 {WHEN 0 THEN 'yes'} {ELSE 'maybe'} END}")
    );
    assert_sql!(
        expr("case 1 when 0 then 'yes' when 1 then 'no' else 'maybe' end"),
        debug("{CASE 1 {WHEN 0 THEN 'yes'} {WHEN 1 THEN 'no'} {ELSE 'maybe'} END}")
    );
    assert_sql!(
        expr(
            r"case case x when 'a' then 1 else 0 end
               when 0 then 'yes'
               else 'maybe'
                end"
        ),
        debug(
            "{CASE \
               {CASE {x} {WHEN 'a' THEN 1} {ELSE 0} END} \
               {WHEN 0 THEN 'yes'} \
               {ELSE 'maybe'} \
              END}"
        )
    );
    // ~ comments
    assert_sql!(
        expr(
            "/*1*/ case /*2*/ 1 /*3*/ when /*4*/ 0 /*5*/ then /*6*/ 'yes' /*7*/ else /*8*/ 'maybe' /*9*/ end /*0*/"
        ),
        debug(with_meta(
            "{ /*1*/ CASE /*2*/ 1 /*3*/ {WHEN /*4*/ 0 /*5*/ THEN /*6*/ 'yes' /*7*/ } {ELSE /*8*/ 'maybe' /*9*/ } END /*0*/ }"
        ))
    );
}

#[test]
fn test_case_exprs_searched() {
    assert_sql!(
        expr("case when 1 = 1 then 'yes' end"),
        debug("{CASE {WHEN {1 = 1} THEN 'yes'} END}")
    );
    assert_sql!(
        expr("case when 1 = 1 then 'yes' else 'no' end"),
        debug("{CASE {WHEN {1 = 1} THEN 'yes'} {ELSE 'no'} END}")
    );
    assert_sql!(
        expr(
            r"case
               when 1 = 1 then 'yes'
               when name like 'foo%' then 'no'
                end"
        ),
        debug(
            "{CASE \
               {WHEN {1 = 1} THEN 'yes'} \
               {WHEN {{name} LIKE 'foo%'} THEN 'no'} \
                 END}"
        )
    );
    // ~ comments
    assert_sql!(
        expr(
            "/*0*/ case /*1*/ when /*2a*/ 1 /*2b*/ = /*2c*/ 1 /*3*/ then /*4*/ 'yes' /*5*/ else /*6*/ 'no' /*7*/ end /*8*/"
        ),
        with_meta(
            "/*0*/ CASE /*1*/ WHEN /*2a*/ 1 /*2b*/ = /*2c*/ 1 /*3*/ THEN /*4*/ 'yes' /*5*/ ELSE /*6*/ 'no' /*7*/ END /*8*/"
        )
    );
}