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
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
// Copyright Materialize, Inc. and contributors. All rights reserved.
//
// Use of this software is governed by the Business Source License
// included in the LICENSE file.
//
// As of the Change Date specified in that file, in accordance with
// the Business Source License, use of this software will be governed
// by the Apache License, Version 2.0.

//! Utilities to build objects from the `repr` crate for unit testing.
//!
//! These test utilities are relied by crates other than `repr`.

use chrono::NaiveDateTime;
use proc_macro2::TokenTree;

use mz_lowertest::deserialize_optional_generic;
use mz_ore::str::StrExt;
use mz_repr::adt::numeric::Numeric;
use mz_repr::{Datum, Row, RowArena, ScalarType};

/* #endregion */

fn parse_litval<'a, F>(litval: &'a str, littyp: &str) -> Result<F, String>
where
    F: std::str::FromStr,
    F::Err: ToString,
{
    litval.parse::<F>().map_err(|e| {
        format!(
            "error when parsing {} into {}: {}",
            litval,
            littyp,
            e.to_string()
        )
    })
}

/// Constructs a `Row` from a sequence of `litval` and `littyp`.
///
/// See [get_scalar_type_or_default] for creating a `ScalarType`.
///
/// Generally, each `litval` can be parsed into a Datum in the manner you would
/// imagine. Exceptions:
/// * A Timestamp should be in the format `"\"%Y-%m-%d %H:%M:%S%.f\""` or
///   `"\"%Y-%m-%d %H:%M:%S\""`
///
/// Not all types are supported yet. Currently supported types:
/// * string, bool, timestamp
/// * all flavors of numeric types
pub fn test_spec_to_row<'a, I>(datum_iter: I) -> Result<Row, String>
where
    I: Iterator<Item = (&'a str, &'a ScalarType)>,
{
    let temp_storage = RowArena::new();
    Row::try_pack(datum_iter.map(|(litval, littyp)| {
        if litval == "null" {
            Ok(Datum::Null)
        } else {
            match littyp {
                ScalarType::Bool => Ok(Datum::from(parse_litval::<bool>(litval, "bool")?)),
                ScalarType::Numeric { .. } => {
                    Ok(Datum::from(parse_litval::<Numeric>(litval, "Numeric")?))
                }
                ScalarType::Int16 => Ok(Datum::from(parse_litval::<i16>(litval, "i16")?)),
                ScalarType::Int32 => Ok(Datum::from(parse_litval::<i32>(litval, "i32")?)),
                ScalarType::Int64 => Ok(Datum::from(parse_litval::<i64>(litval, "i64")?)),
                ScalarType::Float32 => Ok(Datum::from(parse_litval::<f32>(litval, "f32")?)),
                ScalarType::Float64 => Ok(Datum::from(parse_litval::<f64>(litval, "f64")?)),
                ScalarType::String => Ok(Datum::from(
                    temp_storage.push_string(mz_lowertest::unquote(litval)),
                )),
                ScalarType::Timestamp => {
                    let datetime = if litval.contains('.') {
                        NaiveDateTime::parse_from_str(litval, "\"%Y-%m-%d %H:%M:%S%.f\"")
                    } else {
                        NaiveDateTime::parse_from_str(litval, "\"%Y-%m-%d %H:%M:%S\"")
                    };
                    Ok(Datum::from(datetime.map_err(|e| {
                        format!("Error while parsing NaiveDateTime: {}", e)
                    })?))
                }
                _ => Err(format!("Unsupported literal type {:?}", littyp)),
            }
        }
    }))
}

/// Convert a Datum to a String such that [test_spec_to_row] can convert the
/// String back into a row containing the same Datum.
///
/// Currently supports only Datums supported by [test_spec_to_row].
pub fn datum_to_test_spec(datum: Datum) -> String {
    let result = format!("{}", datum);
    match datum {
        Datum::Timestamp(_) => result.quoted().to_string(),
        _ => result,
    }
}

/// Parses `ScalarType` from `scalar_type_stream` or infers it from `litval`
///
/// See [mz_lowertest::to_json] for the syntax for specifying a `ScalarType`.
/// If `scalar_type_stream` is empty, will attempt to guess a `ScalarType` for
/// the literal:
/// * If `litval` is "true", "false", or "null", will return `Bool`.
/// * Else if starts with `'"'`, will return String.
/// * Else if contains `'.'`, will return Float64.
/// * Otherwise, returns Int64.
pub fn get_scalar_type_or_default<I>(
    litval: &str,
    scalar_type_stream: &mut I,
) -> Result<ScalarType, String>
where
    I: Iterator<Item = TokenTree>,
{
    let typ: Option<ScalarType> = deserialize_optional_generic(scalar_type_stream, "ScalarType")?;
    match typ {
        Some(typ) => Ok(typ),
        None => {
            if ["true", "false", "null"].contains(&litval) {
                Ok(ScalarType::Bool)
            } else if litval.starts_with('\"') {
                Ok(ScalarType::String)
            } else if litval.contains('.') {
                Ok(ScalarType::Float64)
            } else {
                Ok(ScalarType::Int64)
            }
        }
    }
}

/// If the stream starts with a sequence of tokens that can be parsed as a datum,
/// return those tokens as one string.
///
/// Sequences of tokens that can be parsed as a datum:
/// * A Literal token, which is anything in quotations or a positive number
/// * An null, false, or true Ident token
/// * Punct(-) + a literal token
///
/// If the stream starts with a sequence of tokens that can be parsed as a
/// datum, 1) returns Ok(Some(..)) 2) advances the stream to the first token
/// that is not part of the sequence.
/// If the stream does not start with tokens that can be parsed as a datum:
/// * Return Ok(None) if `rest_of_stream` has not been advanced.
/// * Returns Err(..) otherwise.
pub fn extract_literal_string<I>(
    first_arg: &TokenTree,
    rest_of_stream: &mut I,
) -> Result<Option<String>, String>
where
    I: Iterator<Item = TokenTree>,
{
    match first_arg {
        TokenTree::Ident(ident) => {
            if ["true", "false", "null"].contains(&&ident.to_string()[..]) {
                Ok(Some(ident.to_string()))
            } else {
                Ok(None)
            }
        }
        TokenTree::Literal(literal) => Ok(Some(literal.to_string())),
        TokenTree::Punct(punct) if punct.as_char() == '-' => {
            match rest_of_stream.next() {
                Some(TokenTree::Literal(literal)) => {
                    Ok(Some(format!("{}{}", punct.as_char(), literal)))
                }
                None => Ok(None),
                // Must error instead of handling the tokens using default
                // behavior since `stream_iter` has advanced.
                Some(other) => Err(format!(
                    "{}{:?} is not a valid literal",
                    punct.as_char(),
                    other
                )),
            }
        }
        _ => Ok(None),
    }
}

/// Parse a token as a vec of strings that can be parsed as datums in a row.
///
/// The token is assumed to be of the form `[datum1 datum2 .. datumn]`.
pub fn parse_vec_of_literals(token: &TokenTree) -> Result<Vec<String>, String> {
    match token {
        TokenTree::Group(group) => {
            let mut inner_iter = group.stream().into_iter();
            let mut result = Vec::new();
            while let Some(symbol) = inner_iter.next() {
                match extract_literal_string(&symbol, &mut inner_iter)? {
                    Some(dat) => result.push(dat),
                    None => {
                        return Err(format!("{:?} cannot be interpreted as a literal.", symbol));
                    }
                }
            }
            Ok(result)
        }
        invalid => Err(format!(
            "{:?} cannot be parsed as a vec of literals",
            invalid
        )),
    }
}