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use std::marker::PhantomData;
use std::iter::Iterator;
use std::ptr::null;
use std::str::from_utf8_unchecked;
use std::slice::from_raw_parts;
use libc::{c_int, c_uint, c_ulong, c_void, c_uchar};
use onig_sys;
use super::Regex;
impl Regex {
pub fn capture_names_len(&self) -> usize {
unsafe { onig_sys::onig_number_of_names(self.raw) as usize }
}
pub fn capture_names<'r>(&'r self) -> CaptureNames<'r> {
CaptureNames {
table: unsafe { (*self.raw).name_table as *const StTable },
bin_idx: -1,
entry_ptr: null(),
_phantom: PhantomData
}
}
}
#[repr(C)]
#[derive(Debug)]
struct NameEntry {
name: *const c_uchar,
name_len: c_int,
back_num: c_int,
back_alloc: c_int,
back_ref1: i32,
back_refs: *const i32
}
#[repr(C)]
#[derive(Debug)]
struct StTableEntry {
hash: c_uint,
key: c_ulong,
record: c_ulong,
next: *const StTableEntry
}
#[repr(C)]
#[derive(Debug)]
struct StTable {
type_: *const c_void,
num_bins: c_int,
num_entries: c_int,
bins: *const *const StTableEntry
}
#[derive(Debug)]
pub struct CaptureNames<'r> {
table: *const StTable,
bin_idx: c_int,
entry_ptr: *const StTableEntry,
_phantom: PhantomData<&'r Regex>
}
impl<'r> Iterator for CaptureNames<'r> {
type Item = (&'r str, &'r [u32]);
fn next(&mut self) -> Option<(&'r str, &'r [u32])> {
unsafe {
while self.entry_ptr.is_null() {
if self.table.is_null() || self.bin_idx + 1 >= (*self.table).num_bins {
return None
}
self.bin_idx += 1;
self.entry_ptr = *(*self.table).bins.offset(self.bin_idx as isize)
}
let entry = (*self.entry_ptr).record as *const NameEntry;
let name = from_utf8_unchecked(
from_raw_parts((*entry).name, (*entry).name_len as usize)
);
let groups = if (*entry).back_num > 1 {
let ptr = (*entry).back_refs as *const u32;
let len = (*entry).back_num as usize;
from_raw_parts(ptr, len)
} else {
let ptr = &(*entry).back_ref1 as *const i32 as *const u32;
from_raw_parts(ptr, 1)
};
self.entry_ptr = (*self.entry_ptr).next;
Some((name, groups))
}
}
}
#[cfg(test)]
mod tests {
use super::super::*;
#[test]
fn test_regex_names_len() {
let regex = Regex::new("(he)(l+)(o)").unwrap();
assert_eq!(regex.capture_names_len(), 0);
let regex = Regex::new("(?<foo>he)(?<bar>l+)(?<bar>o)").unwrap();
assert_eq!(regex.capture_names_len(), 2);
assert_eq!(regex.capture_histories_len(), 0);
}
#[test]
fn test_regex_names() {
let regex = Regex::new("(he)(l+)(o)").unwrap();
let names = regex.capture_names().collect::<Vec<_>>();
assert_eq!(names, vec![]);
let regex = Regex::new("(?<foo>he)(?<bar>l+)(?<bar>o)").unwrap();
let names = regex.capture_names().collect::<Vec<_>>();
assert_eq!(names,
[("foo", &[1u32] as &[u32]), ("bar", &[2u32, 3] as &[u32])]);
}
}