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pub(crate) use re::make_module;
#[pymodule]
mod re {
/*
* Regular expressions.
*
* This module fits the python re interface onto the rust regular expression
* system.
*/
use crate::vm::{
builtins::{PyInt, PyIntRef, PyStr, PyStrRef},
convert::{ToPyObject, TryFromObject},
function::{OptionalArg, PosArgs},
match_class, PyObjectRef, PyResult, PyPayload, VirtualMachine,
};
use num_traits::Signed;
use regex::bytes::{Captures, Regex, RegexBuilder};
use std::fmt;
use std::ops::Range;
#[pyattr]
#[pyclass(module = "re", name = "Pattern")]
#[derive(Debug, PyPayload)]
struct PyPattern {
regex: Regex,
pattern: String,
}
#[pyattr]
const IGNORECASE: usize = 2;
#[pyattr]
const LOCALE: usize = 4;
#[pyattr]
const MULTILINE: usize = 8;
#[pyattr]
const DOTALL: usize = 16;
#[pyattr]
const UNICODE: usize = 32;
#[pyattr]
const VERBOSE: usize = 64;
#[pyattr]
const DEBUG: usize = 128;
#[pyattr]
const ASCII: usize = 256;
#[derive(Default)]
struct PyRegexFlags {
ignorecase: bool,
#[allow(unused)]
locale: bool,
multiline: bool,
dotall: bool,
unicode: bool,
verbose: bool,
#[allow(unused)]
debug: bool,
ascii: bool,
}
impl PyRegexFlags {
fn from_int(bits: usize) -> Self {
// TODO: detect unknown flag bits.
PyRegexFlags {
ignorecase: (bits & IGNORECASE) != 0,
locale: (bits & LOCALE) != 0,
multiline: (bits & MULTILINE) != 0,
dotall: (bits & DOTALL) != 0,
unicode: (bits & UNICODE) != 0,
verbose: (bits & VERBOSE) != 0,
debug: (bits & DEBUG) != 0,
ascii: (bits & ASCII) != 0,
}
}
}
/// Inner data for a match object.
#[pyattr]
#[pyclass(module = "re", name = "Match")]
#[derive(PyPayload)]
struct PyMatch {
haystack: PyStrRef,
captures: Vec<Option<Range<usize>>>,
}
impl fmt::Debug for PyMatch {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "Match()")
}
}
// type PyPatternRef = PyRef<PyPattern>;
// type PyMatchRef = PyRef<PyMatch>;
#[pyfunction(name = "match")]
fn match_(
pattern: PyStrRef,
string: PyStrRef,
flags: OptionalArg<usize>,
vm: &VirtualMachine,
) -> PyResult<Option<PyMatch>> {
let flags = extract_flags(flags);
let regex = make_regex(vm, pattern.as_str(), flags)?;
Ok(do_match(®ex, string))
}
#[pyfunction]
fn search(
pattern: PyStrRef,
string: PyStrRef,
flags: OptionalArg<usize>,
vm: &VirtualMachine,
) -> PyResult<Option<PyMatch>> {
let flags = extract_flags(flags);
let regex = make_regex(vm, pattern.as_str(), flags)?;
Ok(do_search(®ex, string))
}
#[pyfunction]
fn sub(
pattern: PyStrRef,
repl: PyStrRef,
string: PyStrRef,
count: OptionalArg<usize>,
flags: OptionalArg<usize>,
vm: &VirtualMachine,
) -> PyResult<String> {
let flags = extract_flags(flags);
let regex = make_regex(vm, pattern.as_str(), flags)?;
let limit = count.unwrap_or(0);
Ok(do_sub(®ex, repl, string, limit))
}
#[pyfunction]
fn findall(
pattern: PyStrRef,
string: PyStrRef,
flags: OptionalArg<usize>,
vm: &VirtualMachine,
) -> PyResult {
let flags = extract_flags(flags);
let regex = make_regex(vm, pattern.as_str(), flags)?;
do_findall(vm, ®ex, string)
}
#[pyfunction]
fn split(
pattern: PyStrRef,
string: PyStrRef,
maxsplit: OptionalArg<PyIntRef>,
flags: OptionalArg<usize>,
vm: &VirtualMachine,
) -> PyResult {
let flags = extract_flags(flags);
let regex = make_regex(vm, pattern.as_str(), flags)?;
do_split(vm, ®ex, string, maxsplit.into_option())
}
fn do_sub(pattern: &PyPattern, repl: PyStrRef, search_text: PyStrRef, limit: usize) -> String {
let out = pattern.regex.replacen(
search_text.as_str().as_bytes(),
limit,
repl.as_str().as_bytes(),
);
String::from_utf8_lossy(&out).into_owned()
}
fn do_match(pattern: &PyPattern, search_text: PyStrRef) -> Option<PyMatch> {
// I really wish there was a better way to do this; I don't think there is
let mut regex_text = r"\A".to_owned();
regex_text.push_str(pattern.regex.as_str());
let regex = Regex::new(®ex_text).unwrap();
regex
.captures(search_text.as_str().as_bytes())
.map(|captures| create_match(search_text.clone(), captures))
}
fn do_search(regex: &PyPattern, search_text: PyStrRef) -> Option<PyMatch> {
regex
.regex
.captures(search_text.as_str().as_bytes())
.map(|captures| create_match(search_text.clone(), captures))
}
fn do_findall(vm: &VirtualMachine, pattern: &PyPattern, search_text: PyStrRef) -> PyResult {
let out = pattern
.regex
.captures_iter(search_text.as_str().as_bytes())
.map(|captures| match captures.len() {
1 => {
let full = captures.get(0).unwrap().as_bytes();
let full = String::from_utf8_lossy(full).into_owned();
vm.ctx.new_str(full).into()
}
2 => {
let capture = captures.get(1).unwrap().as_bytes();
let capture = String::from_utf8_lossy(capture).into_owned();
vm.ctx.new_str(capture).into()
}
_ => {
let out = captures
.iter()
.skip(1)
.map(|m| {
let s = m
.map(|m| String::from_utf8_lossy(m.as_bytes()).into_owned())
.unwrap_or_default();
vm.ctx.new_str(s).into()
})
.collect();
vm.ctx.new_tuple(out).into()
}
})
.collect();
Ok(vm.ctx.new_list(out).into())
}
fn do_split(
vm: &VirtualMachine,
pattern: &PyPattern,
search_text: PyStrRef,
maxsplit: Option<PyIntRef>,
) -> PyResult {
if maxsplit
.as_ref()
.map_or(false, |i| i.as_bigint().is_negative())
{
return Ok(vm.ctx.new_list(vec![search_text.into()]).into());
}
let maxsplit = maxsplit
.map(|i| i.try_to_primitive::<usize>(vm))
.transpose()?
.unwrap_or(0);
let text = search_text.as_str().as_bytes();
// essentially Regex::split, but it outputs captures as well
let mut output = Vec::new();
let mut last = 0;
for (n, captures) in pattern.regex.captures_iter(text).enumerate() {
let full = captures.get(0).unwrap();
let matched = &text[last..full.start()];
last = full.end();
output.push(Some(matched));
for m in captures.iter().skip(1) {
output.push(m.map(|m| m.as_bytes()));
}
if maxsplit != 0 && n >= maxsplit {
break;
}
}
if last < text.len() {
output.push(Some(&text[last..]));
}
let split = output
.into_iter()
.map(|v| {
vm.unwrap_or_none(v.map(|v| {
vm.ctx
.new_str(String::from_utf8_lossy(v).into_owned())
.into()
}))
})
.collect();
Ok(vm.ctx.new_list(split).into())
}
fn make_regex(vm: &VirtualMachine, pattern: &str, flags: PyRegexFlags) -> PyResult<PyPattern> {
let unicode = if flags.unicode && flags.ascii {
return Err(vm.new_value_error("ASCII and UNICODE flags are incompatible".to_owned()));
} else {
!flags.ascii
};
let r = RegexBuilder::new(pattern)
.case_insensitive(flags.ignorecase)
.multi_line(flags.multiline)
.dot_matches_new_line(flags.dotall)
.ignore_whitespace(flags.verbose)
.unicode(unicode)
.build()
.map_err(|err| match err {
regex::Error::Syntax(s) => vm.new_value_error(format!("Error in regex: {}", s)),
err => vm.new_value_error(format!("Error in regex: {:?}", err)),
})?;
Ok(PyPattern {
regex: r,
pattern: pattern.to_owned(),
})
}
/// Take a found regular expression and convert it to proper match object.
fn create_match(haystack: PyStrRef, captures: Captures) -> PyMatch {
let captures = captures
.iter()
.map(|opt| opt.map(|m| m.start()..m.end()))
.collect();
PyMatch { haystack, captures }
}
fn extract_flags(flags: OptionalArg<usize>) -> PyRegexFlags {
flags.map_or_else(Default::default, PyRegexFlags::from_int)
}
#[pyfunction]
fn compile(
pattern: PyStrRef,
flags: OptionalArg<usize>,
vm: &VirtualMachine,
) -> PyResult<PyPattern> {
let flags = extract_flags(flags);
make_regex(vm, pattern.as_str(), flags)
}
#[pyfunction]
fn escape(pattern: PyStrRef) -> String {
regex::escape(pattern.as_str())
}
#[pyfunction]
fn purge(_vm: &VirtualMachine) {}
#[pyclass]
impl PyPattern {
#[pymethod(name = "match")]
fn match_(&self, text: PyStrRef) -> Option<PyMatch> {
do_match(self, text)
}
#[pymethod]
fn search(&self, text: PyStrRef) -> Option<PyMatch> {
do_search(self, text)
}
#[pymethod]
fn sub(&self, repl: PyStrRef, text: PyStrRef, vm: &VirtualMachine) -> PyResult<PyStrRef> {
let replaced_text = self
.regex
.replace_all(text.as_str().as_bytes(), repl.as_str().as_bytes());
let replaced_text = String::from_utf8_lossy(&replaced_text).into_owned();
Ok(vm.ctx.new_str(replaced_text))
}
#[pymethod]
fn subn(&self, repl: PyStrRef, text: PyStrRef, vm: &VirtualMachine) -> PyResult {
self.sub(repl, text, vm)
}
#[pygetset]
fn pattern(&self, vm: &VirtualMachine) -> PyResult<PyStrRef> {
Ok(vm.ctx.new_str(self.pattern.clone()))
}
#[pymethod]
fn split(
&self,
search_text: PyStrRef,
maxsplit: OptionalArg<PyIntRef>,
vm: &VirtualMachine,
) -> PyResult {
do_split(vm, self, search_text, maxsplit.into_option())
}
#[pymethod]
fn findall(&self, search_text: PyStrRef, vm: &VirtualMachine) -> PyResult {
do_findall(vm, self, search_text)
}
}
#[pyclass]
impl PyMatch {
#[pymethod]
fn start(&self, group: OptionalArg, vm: &VirtualMachine) -> PyResult {
let group = group.unwrap_or_else(|| vm.ctx.new_int(0).into());
let start = self.get_bounds(group, vm)?.map_or_else(
|| vm.ctx.new_int(-1).into(),
|r| vm.ctx.new_int(r.start).into(),
);
Ok(start)
}
#[pymethod]
fn end(&self, group: OptionalArg, vm: &VirtualMachine) -> PyResult {
let group = group.unwrap_or_else(|| vm.ctx.new_int(0).into());
let end = self.get_bounds(group, vm)?.map_or_else(
|| vm.ctx.new_int(-1).into(),
|r| vm.ctx.new_int(r.end).into(),
);
Ok(end)
}
fn subgroup(&self, bounds: Range<usize>) -> String {
self.haystack.as_str()[bounds].to_owned()
}
fn get_bounds(
&self,
id: PyObjectRef,
vm: &VirtualMachine,
) -> PyResult<Option<Range<usize>>> {
match_class!(match id {
i @ PyInt => {
let i = usize::try_from_object(vm, i.into())?;
let capture = self
.captures
.get(i)
.ok_or_else(|| vm.new_index_error("No such group".to_owned()))?;
Ok(capture.clone())
}
_s @ PyStr => unimplemented!(),
_ => Err(vm.new_index_error("No such group".to_owned())),
})
}
fn get_group(&self, id: PyObjectRef, vm: &VirtualMachine) -> PyResult<Option<String>> {
let bounds = self.get_bounds(id, vm)?;
Ok(bounds.map(|b| self.subgroup(b)))
}
#[pymethod]
fn group(&self, groups: PosArgs, vm: &VirtualMachine) -> PyResult {
let mut groups = groups.into_vec();
match groups.len() {
0 => Ok(self
.subgroup(self.captures[0].clone().unwrap())
.to_pyobject(vm)),
1 => self
.get_group(groups.pop().unwrap(), vm)
.map(|g| g.to_pyobject(vm)),
_ => {
let output: Result<Vec<_>, _> = groups
.into_iter()
.map(|id| self.get_group(id, vm).map(|g| g.to_pyobject(vm)))
.collect();
Ok(vm.ctx.new_tuple(output?)).into()
}
}
}
#[pymethod]
fn groups(&self, default: OptionalArg, vm: &VirtualMachine) -> PyTupleRef {
let default = default.into_option();
let groups = self
.captures
.iter()
.map(|capture| {
vm.unwrap_or_none(
capture
.as_ref()
.map(|bounds| self.subgroup(bounds.clone()).to_pyobject(vm))
.or_else(|| default.clone()),
)
})
.collect();
vm.ctx.new_tuple(groups)
}
}
}