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// filepatterns.rs
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//
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// Copyright 2019 Raphaël Gomès <rgomes@octobus.net>
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//
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// This software may be used and distributed according to the terms of the
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// GNU General Public License version 2 or any later version.
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//! Handling of Mercurial-specific patterns.
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use crate::{utils::SliceExt, LineNumber, PatternError, PatternFileError};
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use lazy_static::lazy_static;
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use regex::bytes::{NoExpand, 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::path::{Path, PathBuf};
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use std::vec::Vec;
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lazy_static! {
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static ref RE_ESCAPE: 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
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/// 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 let Some(rest) = input.drop_prefix(source) {
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input = rest;
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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(&RE_ESCAPE[*c as usize])
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}
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_ => res.extend(&RE_ESCAPE[*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| RE_ESCAPE[*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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[b".*", pattern].concat()
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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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[escape_pattern(pattern).as_slice(), b"(?:/|$)"].concat()
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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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[escape_pattern(pattern).as_slice(), b"/"].concat()
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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::RelGlob => {
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let glob_re = glob_to_re(pattern);
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if let Some(rest) = glob_re.drop_prefix(b"[^/]*") {
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[b".*", rest, globsuffix].concat()
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} else {
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[b"(?:|.*/)", glob_re.as_slice(), globsuffix].concat()
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}
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}
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PatternSyntax::Glob | PatternSyntax::RootGlob => {
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[glob_to_re(pattern).as_slice(), globsuffix].concat()
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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().any(|b| GLOB_SPECIAL_CHARACTERS.contains(b))
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{
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let mut escaped = escape_pattern(pat);
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escaped.extend(b"(?:/|$)");
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Ok(escaped)
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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 = (PathBuf, Vec<u8>);
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pub fn parse_pattern_file_contents<P: AsRef<Path>>(
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lines: &[u8],
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file_path: P,
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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 comment_escape_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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let line_buf;
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if line.contains(&b'#') {
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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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line_buf = comment_escape_regex.replace_all(line, NoExpand(b"#"));
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line = &line_buf;
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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 let Some(syntax) = line.drop_prefix(b"syntax:") {
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let syntax = syntax.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
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.push((file_path.as_ref().to_owned(), syntax.to_owned()));
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}
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continue;
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}
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let mut line_syntax: &[u8] = ¤t_syntax;
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for (s, rels) in SYNTAXES.iter() {
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if let Some(rest) = line.drop_prefix(rels) {
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line_syntax = rels;
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line = rest;
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break;
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}
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if let Some(rest) = line.drop_prefix(&[s, &b":"[..]].concat()) {
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line_syntax = rels;
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line = rest;
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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<P: AsRef<Path>>(
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file_path: P,
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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(file_path.as_ref())?;
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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, Path::new("file_path"), false)
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.0,
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);
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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, Path::new("file_path"), false)
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.0,
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vec![]
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);
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let lines = b"glob:**.o";
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assert_eq!(
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parse_pattern_file_contents(lines, Path::new("file_path"), false)
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.0,
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vec![(b"relglob:**.o".to_vec(), 1, b"**.o".to_vec())]
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);
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}
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#[test]
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fn test_build_single_regex_shortcut() {
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assert_eq!(
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br"(?:/|$)".to_vec(),
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build_single_regex(b"rootglob", b"", b"").unwrap()
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);
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assert_eq!(
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br"whatever(?:/|$)".to_vec(),
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build_single_regex(b"rootglob", b"whatever", b"").unwrap()
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);
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assert_eq!(
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br"[^/]*\.o".to_vec(),
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build_single_regex(b"rootglob", b"*.o", b"").unwrap()
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);
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}
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}
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