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Merge pull request #1860 from erickt/master 

add str::find_from_bytes and str::index_from_bytes
This commit is contained in:
Brian Anderson 2012-02-18 13:17:12 -08:00
parent 9e8fc364b0 23703c0661
commit 4370188055
2 changed files with 96 additions and 47 deletions
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3
src/comp/syntax/codemap.rs
View File

@ -157,7 +157,8 @@ fn span_to_lines(sp: span, cm: codemap::codemap) -> @file_lines {
fn get_line(fm: filemap, line: int) -> str unsafe {
let begin: uint = fm.lines[line].byte - fm.start_pos.byte;
let end = alt str::byte_index(*fm.src, '\n' as u8, begin) {
let end = alt str::byte_index_from(*fm.src, '\n' as u8, begin,
str::len(*fm.src)) {
some(e) { e }
none { str::len(*fm.src) }
};

140
src/libcore/str.rs
View File

@ -9,6 +9,8 @@ for correctness, but some UTF-8 unsafe functions are also provided.
For some heavy-duty uses, we recommend trying std::rope.
*/
import option::{some, none};
export
// Creating a string
from_bytes,
@ -69,9 +71,11 @@ export
// Searching
index,
byte_index,
byte_index_from,
rindex,
find,
find_bytes,
find_from_bytes,
contains,
starts_with,
ends_with,
@ -665,8 +669,8 @@ fn replace(s: str, from: str, to: str) : is_not_empty(from) -> str unsafe {
} else {
let idx;
alt find_bytes(s, from) {
option::some(x) { idx = x; }
option::none { ret s; }
some(x) { idx = x; }
none { ret s; }
}
let before = unsafe::slice_bytes(s, 0u, idx as uint);
let after = unsafe::slice_bytes(s, idx as uint + len_bytes(from),
@ -842,7 +846,7 @@ fn index(ss: str, cc: char) -> option<uint> {
// found here?
if ch == cc {
ret option::some(cii);
ret some(cii);
}
cii += 1u;
@ -850,20 +854,26 @@ fn index(ss: str, cc: char) -> option<uint> {
}
// wasn't found
ret option::none;
ret none;
}
// Function: byte_index
//
// Returns the index of the first matching byte
// (as option some/none)
fn byte_index(s: str, b: u8, start: uint) -> option<uint> {
let i = start, l = len_bytes(s);
while i < l {
if s[i] == b { ret some(i); }
i += 1u;
}
ret none;
fn byte_index(s: str, b: u8) -> option<uint> {
byte_index_from(s, b, 0u, len_bytes(s))
}
// Function: byte_index_from
//
// Returns the index of the first matching byte within the range [`start`,
// `end`).
// (as option some/none)
fn byte_index_from(s: str, b: u8, start: uint, end: uint) -> option<uint> {
assert end <= len_bytes(s);
str::as_bytes(s) { |v| vec::position_from(v, start, end) { |x| x == b } }
}
// Function: rindex
@ -880,26 +890,36 @@ fn rindex(ss: str, cc: char) -> option<uint> {
// found here?
if ch == cc {
ret option::some(cii);
ret some(cii);
}
}
// wasn't found
ret option::none;
ret none;
}
//Function: find_bytes
//
// Find the char position of the first instance of one string
// within another, or return option::none
fn find_bytes(haystack: str, needle: str) -> option<uint> {
find_from_bytes(haystack, needle, 0u, len_bytes(haystack))
}
//Function: find_from_bytes
//
// Find the char position of the first instance of one string
// within another, or return option::none
//
// FIXME: Boyer-Moore should be significantly faster
fn find_bytes(haystack: str, needle: str) -> option<uint> {
let haystack_len = len_bytes(haystack);
let needle_len = len_bytes(needle);
fn find_from_bytes(haystack: str, needle: str, start: uint, end:uint)
-> option<uint> {
assert end <= len_bytes(haystack);
if needle_len == 0u { ret option::some(0u); }
if needle_len > haystack_len { ret option::none; }
let needle_len = len_bytes(needle);
if needle_len == 0u { ret some(start); }
if needle_len > end { ret none; }
fn match_at(haystack: str, needle: str, ii: uint) -> bool {
let jj = ii;
@ -907,13 +927,13 @@ fn find_bytes(haystack: str, needle: str) -> option<uint> {
ret true;
}
let ii = 0u;
while ii <= haystack_len - needle_len {
if match_at(haystack, needle, ii) { ret option::some(ii); }
let ii = start;
while ii <= end - needle_len {
if match_at(haystack, needle, ii) { ret some(ii); }
ii += 1u;
}
ret option::none;
ret none;
}
// Function: find
@ -922,8 +942,8 @@ fn find_bytes(haystack: str, needle: str) -> option<uint> {
// within another, or return option::none
fn find(haystack: str, needle: str) -> option<uint> {
alt find_bytes(haystack, needle) {
option::none { ret option::none; }
option::some(nn) { ret option::some(b2c_pos(haystack, nn)); }
none { ret none; }
some(nn) { ret some(b2c_pos(haystack, nn)); }
}
}
@ -1522,18 +1542,18 @@ mod tests {
#[test]
fn test_index() {
assert ( index("hello", 'h') == option::some(0u));
assert ( index("hello", 'e') == option::some(1u));
assert ( index("hello", 'o') == option::some(4u));
assert ( index("hello", 'z') == option::none);
assert ( index("hello", 'h') == some(0u));
assert ( index("hello", 'e') == some(1u));
assert ( index("hello", 'o') == some(4u));
assert ( index("hello", 'z') == none);
}
#[test]
fn test_rindex() {
assert (rindex("hello", 'l') == option::some(3u));
assert (rindex("hello", 'o') == option::some(4u));
assert (rindex("hello", 'h') == option::some(0u));
assert (rindex("hello", 'z') == option::none);
assert (rindex("hello", 'l') == some(3u));
assert (rindex("hello", 'o') == some(4u));
assert (rindex("hello", 'h') == some(0u));
assert (rindex("hello", 'z') == none);
}
#[test]
@ -1738,29 +1758,57 @@ mod tests {
#[test]
fn test_find_bytes() {
// byte positions
assert (find_bytes("banana", "apple pie") == option::none);
assert (find_bytes("", "") == option::some(0u));
assert (find_bytes("banana", "apple pie") == none);
assert (find_bytes("", "") == some(0u));
let data = "ประเทศไทย中华Việt Nam";
assert (find_bytes(data, "") == option::some(0u));
assert (find_bytes(data, "ประเ") == option::some( 0u));
assert (find_bytes(data, "ะเ") == option::some( 6u));
assert (find_bytes(data, "中华") == option::some(27u));
assert (find_bytes(data, "ไท华") == option::none);
assert (find_bytes(data, "") == some(0u));
assert (find_bytes(data, "ประเ") == some( 0u));
assert (find_bytes(data, "ะเ") == some( 6u));
assert (find_bytes(data, "中华") == some(27u));
assert (find_bytes(data, "ไท华") == none);
}
#[test]
fn test_find_from_bytes() {
// byte positions
assert (find_from_bytes("", "", 0u, 0u) == some(0u));
let data = "abcabc";
assert find_from_bytes(data, "ab", 0u, 6u) == some(0u);
assert find_from_bytes(data, "ab", 2u, 6u) == some(3u);
assert find_from_bytes(data, "ab", 2u, 4u) == none;
let data = "ประเทศไทย中华Việt Nam";
data += data;
assert find_from_bytes(data, "", 0u, 43u) == some(0u);
assert find_from_bytes(data, "", 6u, 43u) == some(6u);
assert find_from_bytes(data, "ประ", 0u, 43u) == some( 0u);
assert find_from_bytes(data, "ทศไ", 0u, 43u) == some(12u);
assert find_from_bytes(data, "ย中", 0u, 43u) == some(24u);
assert find_from_bytes(data, "iệt", 0u, 43u) == some(34u);
assert find_from_bytes(data, "Nam", 0u, 43u) == some(40u);
assert find_from_bytes(data, "ประ", 43u, 86u) == some(43u);
assert find_from_bytes(data, "ทศไ", 43u, 86u) == some(55u);
assert find_from_bytes(data, "ย中", 43u, 86u) == some(67u);
assert find_from_bytes(data, "iệt", 43u, 86u) == some(77u);
assert find_from_bytes(data, "Nam", 43u, 86u) == some(83u);
}
#[test]
fn test_find() {
// char positions
assert (find("banana", "apple pie") == option::none);
assert (find("", "") == option::some(0u));
assert (find("banana", "apple pie") == none);
assert (find("", "") == some(0u));
let data = "ประเทศไทย中华Việt Nam";
assert (find(data, "") == option::some(0u));
assert (find(data, "ประเ") == option::some(0u));
assert (find(data, "ะเ") == option::some(2u));
assert (find(data, "中华") == option::some(9u));
assert (find(data, "ไท华") == option::none);
assert (find(data, "") == some(0u));
assert (find(data, "ประเ") == some(0u));
assert (find(data, "ะเ") == some(2u));
assert (find(data, "中华") == some(9u));
assert (find(data, "ไท华") == none);
}
#[test]