rust/hg-core/src/filepatterns.rs
author Raphaël Gomès <rgomes@octobus.net>
Thu, 06 Jun 2019 15:30:56 +0200
changeset 42437 9609430d3625
parent 42327 e8f3740cc067
child 42438 48f1f864d928
permissions -rw-r--r--
rust-filepatterns: use bytes instead of String In my initial patch, I introduced an unnecessary hard constraint on UTF-8 filenames and patterns which I forgot to remove. Although the performance penalty for using String might be negligible, we don't want to break compatibility with non-UTF-8 encodings for no reason. Moreover, this change allows for a cleaner Rust core API. This patch introduces a new utils module that is used with this fix. Finally, PatternError was not put inside the Python module generated by Rust, which would have raised a NameError. Differential Revision: https://phab.mercurial-scm.org/D6485
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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use crate::{LineNumber, PatternError, PatternFileError};
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use regex::bytes::Regex;
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use std::collections::HashMap;
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use std::fs::File;
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use std::io::Read;
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use std::vec::Vec;
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use utils::files::get_path_from_bytes;
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use utils::{replace_slice, SliceExt};
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lazy_static! {
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    static ref reescape: Vec<Vec<u8>> = {
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        let mut v: Vec<Vec<u8>> = (0..=255).map(|byte| vec![byte]).collect();
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        let to_escape = b"()[]{}?*+-|^$\\.&~# \t\n\r\x0b\x0c";
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        for byte in to_escape {
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            v[*byte as usize].insert(0, b'\\');
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        }
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        v
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    };
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}
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/// These are matched in order
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const GLOB_REPLACEMENTS: &[(&[u8], &[u8])] =
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    &[(b"*/", b"(?:.*/)?"), (b"*", b".*"), (b"", b"[^/]*")];
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#[derive(Debug, Copy, Clone, PartialEq, Eq)]
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pub enum PatternSyntax {
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    Regexp,
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    /// Glob that matches at the front of the path
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    RootGlob,
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    /// Glob that matches at any suffix of the path (still anchored at slashes)
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    Glob,
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    Path,
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    RelPath,
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    RelGlob,
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    RelRegexp,
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    RootFiles,
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}
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/// Transforms a glob pattern into a regex
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fn glob_to_re(pat: &[u8]) -> Vec<u8> {
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    let mut input = pat;
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    let mut res: Vec<u8> = vec![];
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    let mut group_depth = 0;
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    while let Some((c, rest)) = input.split_first() {
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        input = rest;
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        match c {
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            b'*' => {
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                for (source, repl) in GLOB_REPLACEMENTS {
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                    if input.starts_with(source) {
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                        input = &input[source.len()..];
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                        res.extend(*repl);
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                        break;
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                    }
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                }
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            }
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            b'?' => res.extend(b"."),
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            b'[' => {
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                match input.iter().skip(1).position(|b| *b == b']') {
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                    None => res.extend(b"\\["),
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                    Some(end) => {
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                        // Account for the one we skipped
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                        let end = end + 1;
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                        res.extend(b"[");
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                        for (i, b) in input[..end].iter().enumerate() {
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                            if *b == b'!' && i == 0 {
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                                res.extend(b"^")
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                            } else if *b == b'^' && i == 0 {
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                                res.extend(b"\\^")
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                            } else if *b == b'\\' {
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                                res.extend(b"\\\\")
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                            } else {
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                                res.push(*b)
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                            }
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                        }
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                        res.extend(b"]");
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                        input = &input[end + 1..];
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                    }
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                }
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            }
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            b'{' => {
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                group_depth += 1;
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                res.extend(b"(?:")
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            }
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            b'}' if group_depth > 0 => {
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                group_depth -= 1;
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                res.extend(b")");
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            }
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            b',' if group_depth > 0 => res.extend(b"|"),
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            b'\\' => {
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                let c = {
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                    if let Some((c, rest)) = input.split_first() {
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                        input = rest;
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                        c
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                    } else {
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                        c
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                    }
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                };
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                res.extend(&reescape[*c as usize])
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            }
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            _ => res.extend(&reescape[*c as usize]),
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        }
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    }
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    res
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}
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fn escape_pattern(pattern: &[u8]) -> Vec<u8> {
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    pattern
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        .iter()
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        .flat_map(|c| reescape[*c as usize].clone())
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        .collect()
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}
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fn parse_pattern_syntax(kind: &[u8]) -> Result<PatternSyntax, PatternError> {
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    match kind {
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        b"re" => Ok(PatternSyntax::Regexp),
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        b"path" => Ok(PatternSyntax::Path),
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        b"relpath" => Ok(PatternSyntax::RelPath),
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        b"rootfilesin" => Ok(PatternSyntax::RootFiles),
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        b"relglob" => Ok(PatternSyntax::RelGlob),
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        b"relre" => Ok(PatternSyntax::RelRegexp),
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        b"glob" => Ok(PatternSyntax::Glob),
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        b"rootglob" => Ok(PatternSyntax::RootGlob),
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        _ => Err(PatternError::UnsupportedSyntax(
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            String::from_utf8_lossy(kind).to_string(),
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        )),
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    }
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}
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/// Builds the regex that corresponds to the given pattern.
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/// If within a `syntax: regexp` context, returns the pattern,
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/// otherwise, returns the corresponding regex.
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fn _build_single_regex(
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    syntax: PatternSyntax,
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    pattern: &[u8],
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    globsuffix: &[u8],
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) -> Vec<u8> {
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    if pattern.is_empty() {
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        return vec![];
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    }
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    match syntax {
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        PatternSyntax::Regexp => pattern.to_owned(),
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        PatternSyntax::RelRegexp => {
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            if pattern[0] == b'^' {
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                return pattern.to_owned();
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            }
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            let mut res = b".*".to_vec();
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            res.extend(pattern);
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            res
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        }
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        PatternSyntax::Path | PatternSyntax::RelPath => {
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            if pattern == b"." {
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                return vec![];
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            }
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            let mut pattern = escape_pattern(pattern);
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            pattern.extend(b"(?:/|$)");
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            pattern
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        }
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        PatternSyntax::RootFiles => {
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            let mut res = if pattern == b"." {
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                vec![]
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            } else {
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                // Pattern is a directory name.
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                let mut as_vec: Vec<u8> = escape_pattern(pattern);
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                as_vec.push(b'/');
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                as_vec
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            };
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            // Anything after the pattern must be a non-directory.
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            res.extend(b"[^/]+$");
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            res
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        }
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        PatternSyntax::Glob
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        | PatternSyntax::RelGlob
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        | PatternSyntax::RootGlob => {
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            let mut res: Vec<u8> = vec![];
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            if syntax == PatternSyntax::RelGlob {
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                res.extend(b"(?:|.*/)");
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            }
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            res.extend(glob_to_re(pattern));
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            res.extend(globsuffix.iter());
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            res
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        }
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    }
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}
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const GLOB_SPECIAL_CHARACTERS: [u8; 7] =
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    [b'*', b'?', b'[', b']', b'{', b'}', b'\\'];
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/// Wrapper function to `_build_single_regex` that short-circuits 'exact' globs
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/// that don't need to be transformed into a regex.
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pub fn build_single_regex(
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    kind: &[u8],
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    pat: &[u8],
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    globsuffix: &[u8],
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) -> Result<Vec<u8>, PatternError> {
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    let enum_kind = parse_pattern_syntax(kind)?;
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    if enum_kind == PatternSyntax::RootGlob
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        && pat.iter().all(|b| GLOB_SPECIAL_CHARACTERS.contains(b))
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    {
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        Ok(pat.to_vec())
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    } else {
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        Ok(_build_single_regex(enum_kind, pat, globsuffix))
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    }
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}
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lazy_static! {
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    static ref SYNTAXES: HashMap<&'static [u8], &'static [u8]> = {
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        let mut m = HashMap::new();
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        m.insert(b"re".as_ref(), b"relre:".as_ref());
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        m.insert(b"regexp".as_ref(), b"relre:".as_ref());
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        m.insert(b"glob".as_ref(), b"relglob:".as_ref());
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        m.insert(b"rootglob".as_ref(), b"rootglob:".as_ref());
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        m.insert(b"include".as_ref(), b"include".as_ref());
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        m.insert(b"subinclude".as_ref(), b"subinclude".as_ref());
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        m
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    };
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}
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pub type PatternTuple = (Vec<u8>, LineNumber, Vec<u8>);
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type WarningTuple = (String, String);
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pub fn parse_pattern_file_contents(
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    lines: &[u8],
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    file_path: &[u8],
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    warn: bool,
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) -> (Vec<PatternTuple>, Vec<WarningTuple>) {
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    let comment_regex = Regex::new(r"((?:^|[^\\])(?:\\\\)*)#.*").unwrap();
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    let mut inputs: Vec<PatternTuple> = vec![];
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    let mut warnings: Vec<WarningTuple> = vec![];
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    let mut current_syntax = b"relre:".as_ref();
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    for (line_number, mut line) in lines.split(|c| *c == b'\n').enumerate() {
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        let line_number = line_number + 1;
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        if line.contains(&('#' as u8)) {
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            if let Some(cap) = comment_regex.captures(line) {
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                line = &line[..cap.get(1).unwrap().end()]
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            }
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            let mut line = line.to_owned();
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            replace_slice(&mut line, br"\#", b"#");
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        }
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        let mut line = line.trim_end();
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        if line.is_empty() {
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            continue;
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        }
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        if line.starts_with(b"syntax:") {
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            let syntax = line[b"syntax:".len()..].trim();
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            if let Some(rel_syntax) = SYNTAXES.get(syntax) {
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                current_syntax = rel_syntax;
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            } else if warn {
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                warnings.push((
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                    String::from_utf8_lossy(file_path).to_string(),
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                    String::from_utf8_lossy(syntax).to_string(),
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                ));
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            }
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            continue;
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        }
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        let mut line_syntax: &[u8] = &current_syntax;
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        for (s, rels) in SYNTAXES.iter() {
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            if line.starts_with(rels) {
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                line_syntax = rels;
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                line = &line[rels.len()..];
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                break;
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            } else if line.starts_with(&[s, b":".as_ref()].concat()) {
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                line_syntax = rels;
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                line = &line[s.len() + 1..];
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                break;
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            }
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        }
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        inputs.push((
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            [line_syntax, line].concat(),
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            line_number,
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            line.to_owned(),
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        ));
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    }
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    (inputs, warnings)
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}
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pub fn read_pattern_file(
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    file_path: &[u8],
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    warn: bool,
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) -> Result<(Vec<PatternTuple>, Vec<WarningTuple>), PatternFileError> {
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    let mut f = File::open(get_path_from_bytes(file_path))?;
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    let mut contents = Vec::new();
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    f.read_to_end(&mut contents)?;
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    Ok(parse_pattern_file_contents(&contents, file_path, warn))
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}
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#[cfg(test)]
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mod tests {
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    use super::*;
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    #[test]
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    fn escape_pattern_test() {
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        let untouched = br#"!"%',/0123456789:;<=>@ABCDEFGHIJKLMNOPQRSTUVWXYZ_`abcdefghijklmnopqrstuvwxyz"#;
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        assert_eq!(escape_pattern(untouched), untouched.to_vec());
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        // All escape codes
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        assert_eq!(
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            escape_pattern(br#"()[]{}?*+-|^$\\.&~# \t\n\r\v\f"#),
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            br#"\(\)\[\]\{\}\?\*\+\-\|\^\$\\\\\.\&\~\#\ \\t\\n\\r\\v\\f"#
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                .to_vec()
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        );
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    }
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    #[test]
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    fn glob_test() {
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        assert_eq!(glob_to_re(br#"?"#), br#"."#);
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        assert_eq!(glob_to_re(br#"*"#), br#"[^/]*"#);
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        assert_eq!(glob_to_re(br#"**"#), br#".*"#);
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        assert_eq!(glob_to_re(br#"**/a"#), br#"(?:.*/)?a"#);
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        assert_eq!(glob_to_re(br#"a/**/b"#), br#"a/(?:.*/)?b"#);
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        assert_eq!(glob_to_re(br#"[a*?!^][^b][!c]"#), br#"[a*?!^][\^b][^c]"#);
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        assert_eq!(glob_to_re(br#"{a,b}"#), br#"(?:a|b)"#);
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        assert_eq!(glob_to_re(br#".\*\?"#), br#"\.\*\?"#);
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    }
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    #[test]
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    fn test_parse_pattern_file_contents() {
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        let lines = b"syntax: glob\n*.elc";
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        assert_eq!(
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            vec![(b"relglob:*.elc".to_vec(), 2, b"*.elc".to_vec())],
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            parse_pattern_file_contents(lines, b"file_path", false).0,
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        );
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   341
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        let lines = b"syntax: include\nsyntax: glob";
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        assert_eq!(
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            parse_pattern_file_contents(lines, b"file_path", false).0,
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            vec![]
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        );
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        let lines = b"glob:**.o";
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   349
        assert_eq!(
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            parse_pattern_file_contents(lines, b"file_path", false).0,
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   351
            vec![(b"relglob:**.o".to_vec(), 1, b"**.o".to_vec())]
9609430d3625 rust-filepatterns: use bytes instead of String
Raphaël Gomès <rgomes@octobus.net>
parents: 42327
diff changeset
   352
        );
42327
e8f3740cc067 rust-filepatterns: add a Rust implementation of pattern-related utils
Raphaël Gomès <rgomes@octobus.net>
parents:
diff changeset
   353
    }
e8f3740cc067 rust-filepatterns: add a Rust implementation of pattern-related utils
Raphaël Gomès <rgomes@octobus.net>
parents:
diff changeset
   354
}