Mirrors/servo
1
0
Fork 0
mirror of https://github.com/servo/servo.git synced 2025-07-29 18:20:24 +01:00
Code Issues Projects Releases Packages Wiki Activity

Cargoify servo

Browse source
This commit is contained in:
Jack Moffitt 2014-08-28 09:34:23 -06:00
parent db2f642c32
commit c6ab60dbfc
1761 changed files with 8423 additions and 2294 deletions
Download patch file Download diff file Expand all files Collapse all files

285
components/gfx/text/util.rs Normal file
View file

@ -0,0 +1,285 @@
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use text::glyph::CharIndex;
#[deriving(PartialEq)]
pub enum CompressionMode {
CompressNone,
CompressWhitespace,
CompressWhitespaceNewline,
DiscardNewline
}
// ported from Gecko's nsTextFrameUtils::TransformText.
//
// High level TODOs:
//
// * Issue #113: consider incoming text state (arabic, etc)
// and propogate outgoing text state (dual of above)
//
// * Issue #114: record skipped and kept chars for mapping original to new text
//
// * Untracked: various edge cases for bidi, CJK, etc.
pub fn transform_text(text: &str, mode: CompressionMode,
incoming_whitespace: bool,
new_line_pos: &mut Vec<CharIndex>) -> (String, bool) {
let mut out_str = String::new();
let out_whitespace = match mode {
CompressNone | DiscardNewline => {
let mut new_line_index = CharIndex(0);
for ch in text.chars() {
if is_discardable_char(ch, mode) {
// TODO: record skipped char
} else {
// TODO: record kept char
if ch == '\t' {
// TODO: set "has tab" flag
} else if ch == '\n' {
// Save new-line's position for line-break
// This value is relative(not absolute)
new_line_pos.push(new_line_index);
new_line_index = CharIndex(0);
}
if ch != '\n' {
new_line_index = new_line_index + CharIndex(1);
}
out_str.push_char(ch);
}
}
text.len() > 0 && is_in_whitespace(text.char_at_reverse(0), mode)
},
CompressWhitespace | CompressWhitespaceNewline => {
let mut in_whitespace: bool = incoming_whitespace;
for ch in text.chars() {
// TODO: discard newlines between CJK chars
let mut next_in_whitespace: bool = is_in_whitespace(ch, mode);
if !next_in_whitespace {
if is_always_discardable_char(ch) {
// revert whitespace setting, since this char was discarded
next_in_whitespace = in_whitespace;
// TODO: record skipped char
} else {
// TODO: record kept char
out_str.push_char(ch);
}
} else { /* next_in_whitespace; possibly add a space char */
if in_whitespace {
// TODO: record skipped char
} else {
// TODO: record kept char
out_str.push_char(' ');
}
}
// save whitespace context for next char
in_whitespace = next_in_whitespace;
} /* /for str::each_char */
in_whitespace
}
};
return (out_str.into_string(), out_whitespace);
fn is_in_whitespace(ch: char, mode: CompressionMode) -> bool {
match (ch, mode) {
(' ', _) => true,
('\t', _) => true,
('\n', CompressWhitespaceNewline) => true,
(_, _) => false
}
}
fn is_discardable_char(ch: char, mode: CompressionMode) -> bool {
if is_always_discardable_char(ch) {
return true;
}
match mode {
DiscardNewline | CompressWhitespaceNewline => ch == '\n',
_ => false
}
}
fn is_always_discardable_char(_ch: char) -> bool {
// TODO: check for bidi control chars, soft hyphens.
false
}
}
pub fn float_to_fixed(before: int, f: f64) -> i32 {
(1i32 << before as uint) * (f as i32)
}
pub fn fixed_to_float(before: int, f: i32) -> f64 {
f as f64 * 1.0f64 / ((1i32 << before as uint) as f64)
}
pub fn fixed_to_rounded_int(before: int, f: i32) -> int {
let half = 1i32 << (before-1) as uint;
if f > 0i32 {
((half + f) >> before as uint) as int
} else {
-((half - f) >> before as uint) as int
}
}
/* Generate a 32-bit TrueType tag from its 4 characters */
pub fn true_type_tag(a: char, b: char, c: char, d: char) -> u32 {
let a = a as u32;
let b = b as u32;
let c = c as u32;
let d = d as u32;
(a << 24 | b << 16 | c << 8 | d) as u32
}
#[test]
fn test_true_type_tag() {
assert_eq!(true_type_tag('c', 'm', 'a', 'p'), 0x_63_6D_61_70_u32);
}
#[test]
fn test_transform_compress_none() {
let test_strs = vec!(
" foo bar",
"foo bar ",
"foo\n bar",
"foo \nbar",
" foo bar \nbaz",
"foo bar baz",
"foobarbaz\n\n"
);
let mode = CompressNone;
for test in test_strs.iter() {
let mut new_line_pos = vec!();
let (trimmed_str, _out) = transform_text(*test, mode, true, &mut new_line_pos);
assert_eq!(trimmed_str.as_slice(), *test)
}
}
#[test]
fn test_transform_discard_newline() {
let test_strs = vec!(
" foo bar",
"foo bar ",
"foo\n bar",
"foo \nbar",
" foo bar \nbaz",
"foo bar baz",
"foobarbaz\n\n"
);
let oracle_strs = vec!(
" foo bar",
"foo bar ",
"foo bar",
"foo bar",
" foo bar baz",
"foo bar baz",
"foobarbaz"
);
assert_eq!(test_strs.len(), oracle_strs.len());
let mode = DiscardNewline;
for (test, oracle) in test_strs.iter().zip(oracle_strs.iter()) {
let mut new_line_pos = vec!();
let (trimmed_str, _out) = transform_text(*test, mode, true, &mut new_line_pos);
assert_eq!(trimmed_str.as_slice(), *oracle)
}
}
/* FIXME: Fix and re-enable
#[test]
fn test_transform_compress_whitespace() {
let test_strs : ~[String] = ~[" foo bar".to_string(),
"foo bar ".to_string(),
"foo\n bar".to_string(),
"foo \nbar".to_string(),
" foo bar \nbaz".to_string(),
"foo bar baz".to_string(),
"foobarbaz\n\n".to_string()];
let oracle_strs : ~[String] = ~[" foo bar".to_string(),
"foo bar ".to_string(),
"foo\n bar".to_string(),
"foo \nbar".to_string(),
" foo bar \nbaz".to_string(),
"foo bar baz".to_string(),
"foobarbaz\n\n".to_string()];
assert_eq!(test_strs.len(), oracle_strs.len());
let mode = CompressWhitespace;
for i in range(0, test_strs.len()) {
let mut new_line_pos = ~[];
let (trimmed_str, _out) = transform_text(test_strs[i], mode, true, &mut new_line_pos);
assert_eq!(&trimmed_str, &oracle_strs[i])
}
}
#[test]
fn test_transform_compress_whitespace_newline() {
let test_strs : ~[String] = ~[" foo bar".to_string(),
"foo bar ".to_string(),
"foo\n bar".to_string(),
"foo \nbar".to_string(),
" foo bar \nbaz".to_string(),
"foo bar baz".to_string(),
"foobarbaz\n\n".to_string()];
let oracle_strs : ~[String] = ~["foo bar".to_string(),
"foo bar ".to_string(),
"foo bar".to_string(),
"foo bar".to_string(),
" foo bar baz".to_string(),
"foo bar baz".to_string(),
"foobarbaz ".to_string()];
assert_eq!(test_strs.len(), oracle_strs.len());
let mode = CompressWhitespaceNewline;
for i in range(0, test_strs.len()) {
let mut new_line_pos = ~[];
let (trimmed_str, _out) = transform_text(test_strs[i], mode, true, &mut new_line_pos);
assert_eq!(&trimmed_str, &oracle_strs[i])
}
}
*/
#[test]
fn test_transform_compress_whitespace_newline_no_incoming() {
let test_strs = vec!(
" foo bar",
"\nfoo bar",
"foo bar ",
"foo\n bar",
"foo \nbar",
" foo bar \nbaz",
"foo bar baz",
"foobarbaz\n\n"
);
let oracle_strs = vec!(
" foo bar",
" foo bar",
"foo bar ",
"foo bar",
"foo bar",
" foo bar baz",
"foo bar baz",
"foobarbaz "
);
assert_eq!(test_strs.len(), oracle_strs.len());
let mode = CompressWhitespaceNewline;
for (test, oracle) in test_strs.iter().zip(oracle_strs.iter()) {
let mut new_line_pos = vec!();
let (trimmed_str, _out) = transform_text(*test, mode, false, &mut new_line_pos);
assert_eq!(trimmed_str.as_slice(), *oracle)
}
}