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
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
// 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.

//! A parser for sqllogictest.

use std::borrow::ToOwned;

use anyhow::{anyhow, bail};
use mz_repr::ColumnName;
use once_cell::sync::Lazy;
use regex::Regex;

use crate::ast::{Location, Mode, Output, QueryOutput, Record, Sort, Type};

static QUERY_OUTPUT_REGEX: Lazy<Regex> = Lazy::new(|| Regex::new(r"\r?\n----").unwrap());
static DOUBLE_LINE_REGEX: Lazy<Regex> =
    Lazy::new(|| Regex::new(r"(\n|\r\n|$)(\n|\r\n|$)").unwrap());
static EOF_REGEX: Lazy<Regex> = Lazy::new(|| Regex::new(r"(\n|\r\n)EOF(\n|\r\n)").unwrap());

#[derive(Debug, Clone)]
pub struct Parser<'a> {
    contents: &'a str,
    fname: String,
    curline: usize,
    mode: Mode,
}

impl<'a> Parser<'a> {
    pub fn new(fname: &str, contents: &'a str) -> Self {
        Parser {
            contents,
            fname: fname.to_string(),
            curline: 1,
            mode: Mode::Standard,
        }
    }

    pub fn is_done(&self) -> bool {
        self.contents.is_empty()
    }

    pub fn location(&self) -> Location {
        Location {
            file: self.fname.clone(),
            line: self.curline,
        }
    }

    fn consume(&mut self, upto: usize) {
        for ch in self.contents[..upto].chars() {
            if ch == '\n' {
                self.curline += 1;
            }
        }
        self.contents = &self.contents[upto..];
    }

    pub fn split_at(&mut self, sep: &Regex) -> Result<&'a str, anyhow::Error> {
        match sep.find(self.contents) {
            Some(found) => {
                let result = &self.contents[..found.start()];
                self.consume(found.end());
                Ok(result)
            }
            None => bail!("Couldn't split {:?} at {:?}", self.contents, sep),
        }
    }

    pub fn parse_record(&mut self) -> Result<Record<'a>, anyhow::Error> {
        if self.is_done() {
            return Ok(Record::Halt);
        }

        let line_number = self.curline;

        static COMMENT_AND_LINE_REGEX: Lazy<Regex> =
            Lazy::new(|| Regex::new("(#[^\n]*)?\r?(\n|$)").unwrap());
        let first_line = self.split_at(&COMMENT_AND_LINE_REGEX)?.trim();

        if first_line.is_empty() {
            // query starts on the next line
            return self.parse_record();
        }

        let mut words = first_line.split(' ').peekable();
        match words.next().unwrap() {
            "statement" => self.parse_statement(words, first_line),

            "query" => self.parse_query(words, first_line),

            "simple" => self.parse_simple(words),

            "hash-threshold" => {
                let threshold = words
                    .next()
                    .ok_or_else(|| anyhow!("missing threshold in: {}", first_line))?
                    .parse::<u64>()
                    .map_err(|err| anyhow!("invalid threshold ({}) in: {}", err, first_line))?;
                Ok(Record::HashThreshold { threshold })
            }

            // we'll follow the postgresql version of all these tests
            "skipif" => {
                match words.next().unwrap() {
                    "postgresql" => {
                        // discard next record
                        self.parse_record()?;
                        self.parse_record()
                    }
                    _ => self.parse_record(),
                }
            }
            "onlyif" => {
                match words.next().unwrap() {
                    "postgresql" => self.parse_record(),
                    _ => {
                        // discard next record
                        self.parse_record()?;
                        self.parse_record()
                    }
                }
            }

            "halt" => Ok(Record::Halt),

            // this is some cockroach-specific thing, we don't care
            "subtest" | "user" | "kv-batch-size" => self.parse_record(),

            "mode" => {
                self.mode = match words.next() {
                    Some("cockroach") => Mode::Cockroach,
                    Some("standard") | Some("sqlite") => Mode::Standard,
                    other => bail!("unknown parse mode: {:?}", other),
                };
                self.parse_record()
            }

            "copy" => Ok(Record::Copy {
                table_name: words
                    .next()
                    .ok_or_else(|| anyhow!("load directive missing table name"))?,
                tsv_path: words
                    .next()
                    .ok_or_else(|| anyhow!("load directive missing TSV path"))?,
            }),

            "reset-server" => Ok(Record::ResetServer),

            other => bail!(
                "Unexpected start of record on line {}: {}",
                line_number,
                other
            ),
        }
    }

    pub fn parse_records(&mut self) -> Result<Vec<Record<'a>>, anyhow::Error> {
        let mut records = vec![];
        loop {
            match self.parse_record()? {
                Record::Halt => break,
                record => records.push(record),
            }
        }
        Ok(records)
    }

    fn parse_statement(
        &mut self,
        mut words: impl Iterator<Item = &'a str>,
        first_line: &'a str,
    ) -> Result<Record<'a>, anyhow::Error> {
        let location = self.location();
        let mut expected_error = None;
        let mut rows_affected = None;
        match words.next() {
            Some("count") => {
                rows_affected = Some(
                    words
                        .next()
                        .ok_or_else(|| anyhow!("missing count of rows affected"))?
                        .parse::<u64>()
                        .map_err(|err| anyhow!("parsing count of rows affected: {}", err))?,
                );
            }
            Some("ok") | Some("OK") => (),
            Some("error") => expected_error = Some(parse_expected_error(first_line)),
            _ => bail!("invalid statement disposition: {}", first_line),
        };
        let sql = self.split_at(&DOUBLE_LINE_REGEX)?;
        Ok(Record::Statement {
            expected_error,
            rows_affected,
            sql,
            location,
        })
    }

    fn parse_query(
        &mut self,
        mut words: std::iter::Peekable<impl Iterator<Item = &'a str>>,
        first_line: &'a str,
    ) -> Result<Record<'a>, anyhow::Error> {
        let location = self.location();
        if words.peek() == Some(&"error") {
            let error = parse_expected_error(first_line);
            let sql = self.split_at(&DOUBLE_LINE_REGEX)?;
            return Ok(Record::Query {
                sql,
                output: Err(error),
                location,
            });
        }

        let types = words.next().map_or(Ok(vec![]), parse_types)?;
        let mut sort = Sort::No;
        let mut check_column_names = false;
        let mut multiline = false;
        if let Some(options) = words.next() {
            for option in options.split(',') {
                match option {
                    "nosort" => sort = Sort::No,
                    "rowsort" => sort = Sort::Row,
                    "valuesort" => sort = Sort::Value,
                    "colnames" => check_column_names = true,
                    "multiline" => multiline = true,
                    other => {
                        if other.starts_with("partialsort") {
                            // TODO(jamii) https://github.com/cockroachdb/cockroach/blob/d2f7fbf5dd1fc1a099bbad790a2e1f7c60a66cc3/pkg/sql/logictest/logic.go#L153
                            // partialsort has comma-separated arguments so our parsing is totally broken
                            // luckily it always comes last in the existing tests, so we can just bail out for now
                            sort = Sort::Row;
                            break;
                        } else {
                            bail!("Unrecognized option {:?} in {:?}", other, options);
                        }
                    }
                };
            }
        }
        if multiline && (check_column_names || sort.yes()) {
            bail!("multiline option is incompatible with all other options");
        }
        let label = words.next();
        static LINE_REGEX: Lazy<Regex> = Lazy::new(|| Regex::new("\r?(\n|$)").unwrap());
        static HASH_REGEX: Lazy<Regex> =
            Lazy::new(|| Regex::new(r"(\S+) values hashing to (\S+)").unwrap());
        let sql = self.split_at(&QUERY_OUTPUT_REGEX)?;
        let mut output_str = self
            .split_at(if multiline {
                &EOF_REGEX
            } else {
                &DOUBLE_LINE_REGEX
            })?
            .trim_start();
        // We don't want to advance the expected output past the column names so rewriting works,
        // but need to be able to parse past them, so remember the position before possible column
        // names.
        let query_output_str = output_str;
        let column_names = if check_column_names {
            Some(
                split_at(&mut output_str, &LINE_REGEX)?
                    .split(' ')
                    .filter(|s| !s.is_empty())
                    .map(|s| ColumnName::from(s.replace('␠', " ")))
                    .collect(),
            )
        } else {
            None
        };
        let output = match HASH_REGEX.captures(output_str) {
            Some(captures) => Output::Hashed {
                num_values: captures.get(1).unwrap().as_str().parse::<usize>()?,
                md5: captures.get(2).unwrap().as_str().to_owned(),
            },
            None => {
                if multiline {
                    Output::Values(vec![output_str.to_owned()])
                } else if output_str.starts_with('\r') || output_str.starts_with('\n') {
                    Output::Values(vec![])
                } else {
                    let mut vals: Vec<String> = output_str.lines().map(|s| s.to_owned()).collect();
                    if let Mode::Cockroach = self.mode {
                        let mut rows: Vec<Vec<String>> = vec![];
                        for line in vals {
                            let cols = split_cols(&line, types.len());
                            if sort != Sort::No && cols.len() != types.len() {
                                // We can't check this condition for
                                // Sort::No, because some tests use strings
                                // with whitespace that look like extra
                                // columns. (Note that these tests never
                                // use any of the sorting options.)
                                bail!(
                                    "col len ({}) did not match declared col len ({})",
                                    cols.len(),
                                    types.len()
                                );
                            }
                            rows.push(cols.into_iter().map(|col| col.replace('␠', " ")).collect());
                        }
                        if sort == Sort::Row {
                            rows.sort();
                        }
                        vals = rows.into_iter().flatten().collect();
                        if sort == Sort::Value {
                            vals.sort();
                        }
                    }
                    Output::Values(vals)
                }
            }
        };
        Ok(Record::Query {
            sql,
            output: Ok(QueryOutput {
                types,
                sort,
                label,
                column_names,
                mode: self.mode,
                output,
                output_str: query_output_str,
            }),
            location,
        })
    }

    fn parse_simple(
        &mut self,
        mut words: std::iter::Peekable<impl Iterator<Item = &'a str>>,
    ) -> Result<Record<'a>, anyhow::Error> {
        let location = self.location();
        let mut conn = None;
        let mut user = None;
        let mut multiline = false;
        if let Some(options) = words.next() {
            for option in options.split(',') {
                if let Some(value) = option.strip_prefix("conn=") {
                    conn = Some(value);
                } else if let Some(value) = option.strip_prefix("user=") {
                    user = Some(value);
                } else if option == "multiline" {
                    multiline = true;
                } else {
                    bail!("Unrecognized option {:?} in {:?}", option, options);
                }
            }
        }
        if user.is_some() && conn.is_none() {
            bail!("cannot set user without also setting conn");
        }
        let sql = self.split_at(&QUERY_OUTPUT_REGEX)?;
        let output_str = self
            .split_at(if multiline {
                &EOF_REGEX
            } else {
                &DOUBLE_LINE_REGEX
            })?
            .trim_start();
        let output = if multiline {
            Output::Values({
                let mut v = vec![output_str.to_owned()];
                // for simple queries we still have to pass the COMPLETE string after the EOF
                let complete_str = self.split_at(&DOUBLE_LINE_REGEX)?.trim_start();
                v.extend(complete_str.lines().map(String::from));
                v
            })
        } else {
            Output::Values(output_str.lines().map(String::from).collect())
        };
        Ok(Record::Simple {
            location,
            conn,
            user,
            sql,
            output,
            output_str,
        })
    }
}

fn split_at<'a>(input: &mut &'a str, sep: &Regex) -> Result<&'a str, anyhow::Error> {
    match sep.find(input) {
        Some(found) => {
            let result = &input[..found.start()];
            *input = &input[found.end()..];
            Ok(result)
        }
        None => bail!("Couldn't split {:?} at {:?}", input, sep),
    }
}

/// Parse a query result type string into a vec of expected types
fn parse_types(input: &str) -> Result<Vec<Type>, anyhow::Error> {
    input
        .chars()
        .map(|char| {
            Ok(match char {
                'T' => Type::Text,
                'I' => Type::Integer,
                'R' => Type::Real,
                'B' => Type::Bool,
                'O' => Type::Oid,
                _ => bail!("Unexpected type char {} in: {}", char, input),
            })
        })
        .collect()
}

fn parse_expected_error(line: &str) -> &str {
    static PGCODE_RE: Lazy<Regex> =
        Lazy::new(|| Regex::new("(statement|query) error( pgcode [a-zA-Z0-9]{5})? ?").unwrap());
    // TODO(benesch): one day this should record the expected pgcode, if
    // specified.
    let pos = PGCODE_RE.find(line).unwrap().end();
    &line[pos..]
}

/// Split on whitespace to normalize multiple spaces to one space. This happens
/// unconditionally in Cockroach mode, regardless of the sort option.
///
/// TODO: this doesn't have the whitespace-collapsing behavior for
/// single-column values that cockroach relies on
pub(crate) fn split_cols(line: &str, expected_columns: usize) -> Vec<&str> {
    if expected_columns == 1 {
        vec![line.trim()]
    } else {
        line.split_whitespace().collect()
    }
}