auto merge of #18504 : pcwalton/rust/small-escapes, r=pcwalton
Use `\u0080`-`\u00ff` instead. ASCII/byte literals are unaffected. This PR introduces a new function, `escape_default`, into the ASCII module. This was necessary for the pretty printer to continue to function. RFC #326. Closes #18062. [breaking-change] r? @aturon
This commit is contained in:
commit
4375b32dab
12 changed files with 4276 additions and 4191 deletions
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@ -283,7 +283,7 @@ def load_east_asian_width(want_widths, except_cats):
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return widths
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return widths
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def escape_char(c):
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def escape_char(c):
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if c <= 0xff:
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if c <= 0x7f:
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return "'\\x%2.2x'" % c
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return "'\\x%2.2x'" % c
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if c <= 0xffff:
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if c <= 0xffff:
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return "'\\u%4.4x'" % c
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return "'\\u%4.4x'" % c
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@ -810,7 +810,7 @@ mod tests {
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assert_eq!("".len(), 0u);
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assert_eq!("".len(), 0u);
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assert_eq!("hello world".len(), 11u);
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assert_eq!("hello world".len(), 11u);
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assert_eq!("\x63".len(), 1u);
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assert_eq!("\x63".len(), 1u);
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assert_eq!("\xa2".len(), 2u);
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assert_eq!("\u00a2".len(), 2u);
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assert_eq!("\u03c0".len(), 2u);
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assert_eq!("\u03c0".len(), 2u);
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assert_eq!("\u2620".len(), 3u);
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assert_eq!("\u2620".len(), 3u);
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assert_eq!("\U0001d11e".len(), 4u);
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assert_eq!("\U0001d11e".len(), 4u);
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@ -818,7 +818,7 @@ mod tests {
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assert_eq!("".char_len(), 0u);
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assert_eq!("".char_len(), 0u);
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assert_eq!("hello world".char_len(), 11u);
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assert_eq!("hello world".char_len(), 11u);
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assert_eq!("\x63".char_len(), 1u);
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assert_eq!("\x63".char_len(), 1u);
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assert_eq!("\xa2".char_len(), 1u);
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assert_eq!("\u00a2".char_len(), 1u);
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assert_eq!("\u03c0".char_len(), 1u);
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assert_eq!("\u03c0".char_len(), 1u);
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assert_eq!("\u2620".char_len(), 1u);
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assert_eq!("\u2620".char_len(), 1u);
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assert_eq!("\U0001d11e".char_len(), 1u);
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assert_eq!("\U0001d11e".char_len(), 1u);
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@ -1499,7 +1499,8 @@ mod tests {
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assert_eq!("a c".escape_unicode(), String::from_str("\\x61\\x20\\x63"));
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assert_eq!("a c".escape_unicode(), String::from_str("\\x61\\x20\\x63"));
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assert_eq!("\r\n\t".escape_unicode(), String::from_str("\\x0d\\x0a\\x09"));
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assert_eq!("\r\n\t".escape_unicode(), String::from_str("\\x0d\\x0a\\x09"));
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assert_eq!("'\"\\".escape_unicode(), String::from_str("\\x27\\x22\\x5c"));
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assert_eq!("'\"\\".escape_unicode(), String::from_str("\\x27\\x22\\x5c"));
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assert_eq!("\x00\x01\xfe\xff".escape_unicode(), String::from_str("\\x00\\x01\\xfe\\xff"));
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assert_eq!("\x00\x01\u00fe\u00ff".escape_unicode(),
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String::from_str("\\x00\\x01\\u00fe\\u00ff"));
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assert_eq!("\u0100\uffff".escape_unicode(), String::from_str("\\u0100\\uffff"));
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assert_eq!("\u0100\uffff".escape_unicode(), String::from_str("\\u0100\\uffff"));
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assert_eq!("\U00010000\U0010ffff".escape_unicode(),
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assert_eq!("\U00010000\U0010ffff".escape_unicode(),
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String::from_str("\\U00010000\\U0010ffff"));
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String::from_str("\\U00010000\\U0010ffff"));
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@ -1783,11 +1784,11 @@ mod tests {
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t!("\u2126", "\u03a9");
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t!("\u2126", "\u03a9");
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t!("\u1e0b\u0323", "\u1e0d\u0307");
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t!("\u1e0b\u0323", "\u1e0d\u0307");
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t!("\u1e0d\u0307", "\u1e0d\u0307");
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t!("\u1e0d\u0307", "\u1e0d\u0307");
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t!("a\u0301", "\xe1");
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t!("a\u0301", "\u00e1");
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t!("\u0301a", "\u0301a");
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t!("\u0301a", "\u0301a");
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t!("\ud4db", "\ud4db");
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t!("\ud4db", "\ud4db");
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t!("\uac1c", "\uac1c");
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t!("\uac1c", "\uac1c");
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t!("a\u0300\u0305\u0315\u05aeb", "\xe0\u05ae\u0305\u0315b");
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t!("a\u0300\u0305\u0315\u05aeb", "\u00e0\u05ae\u0305\u0315b");
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}
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}
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#[test]
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#[test]
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@ -1803,11 +1804,11 @@ mod tests {
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t!("\u2126", "\u03a9");
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t!("\u2126", "\u03a9");
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t!("\u1e0b\u0323", "\u1e0d\u0307");
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t!("\u1e0b\u0323", "\u1e0d\u0307");
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t!("\u1e0d\u0307", "\u1e0d\u0307");
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t!("\u1e0d\u0307", "\u1e0d\u0307");
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t!("a\u0301", "\xe1");
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t!("a\u0301", "\u00e1");
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t!("\u0301a", "\u0301a");
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t!("\u0301a", "\u0301a");
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t!("\ud4db", "\ud4db");
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t!("\ud4db", "\ud4db");
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t!("\uac1c", "\uac1c");
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t!("\uac1c", "\uac1c");
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t!("a\u0300\u0305\u0315\u05aeb", "\xe0\u05ae\u0305\u0315b");
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t!("a\u0300\u0305\u0315\u05aeb", "\u00e0\u05ae\u0305\u0315b");
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}
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}
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#[test]
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#[test]
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@ -176,7 +176,7 @@ pub fn escape_unicode(c: char, f: |char|) {
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// here.
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// here.
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f('\\');
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f('\\');
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let pad = match () {
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let pad = match () {
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_ if c <= '\xff' => { f('x'); 2 }
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_ if c <= '\x7f' => { f('x'); 2 }
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_ if c <= '\uffff' => { f('u'); 4 }
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_ if c <= '\uffff' => { f('u'); 4 }
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_ => { f('U'); 8 }
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_ => { f('U'); 8 }
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};
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};
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@ -140,8 +140,8 @@ fn test_escape_default() {
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assert_eq!(s.as_slice(), "\\x1f");
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assert_eq!(s.as_slice(), "\\x1f");
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let s = string('\x7f');
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let s = string('\x7f');
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assert_eq!(s.as_slice(), "\\x7f");
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assert_eq!(s.as_slice(), "\\x7f");
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let s = string('\xff');
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let s = string('\u00ff');
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assert_eq!(s.as_slice(), "\\xff");
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assert_eq!(s.as_slice(), "\\u00ff");
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let s = string('\u011b');
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let s = string('\u011b');
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assert_eq!(s.as_slice(), "\\u011b");
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assert_eq!(s.as_slice(), "\\u011b");
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let s = string('\U0001d4b6');
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let s = string('\U0001d4b6');
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@ -211,8 +211,8 @@ fn test_width() {
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assert_eq!('h'.width(false),Some(2));
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assert_eq!('h'.width(false),Some(2));
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assert_eq!('h'.width(true),Some(2));
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assert_eq!('h'.width(true),Some(2));
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assert_eq!('\xAD'.width(false),Some(1));
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assert_eq!('\u00AD'.width(false),Some(1));
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assert_eq!('\xAD'.width(true),Some(1));
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assert_eq!('\u00AD'.width(true),Some(1));
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assert_eq!('\u1160'.width(false),Some(0));
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assert_eq!('\u1160'.width(false),Some(0));
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assert_eq!('\u1160'.width(true),Some(0));
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assert_eq!('\u1160'.width(true),Some(0));
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@ -209,14 +209,16 @@ mat!(match_flag_ungreedy_greedy, "(?U)a+?", "aa", Some((0, 2)))
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mat!(match_flag_ungreedy_noop, "(?U)(?-U)a+", "aa", Some((0, 2)))
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mat!(match_flag_ungreedy_noop, "(?U)(?-U)a+", "aa", Some((0, 2)))
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// Some Unicode tests.
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// Some Unicode tests.
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mat!(uni_literal, r"Ⅰ", "Ⅰ", Some((0, 3)))
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// A couple of these are commented out because something in the guts of macro expansion is creating
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// invalid byte strings.
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//mat!(uni_literal, r"Ⅰ", "Ⅰ", Some((0, 3)))
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mat!(uni_one, r"\pN", "Ⅰ", Some((0, 3)))
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mat!(uni_one, r"\pN", "Ⅰ", Some((0, 3)))
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mat!(uni_mixed, r"\pN+", "Ⅰ1Ⅱ2", Some((0, 8)))
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mat!(uni_mixed, r"\pN+", "Ⅰ1Ⅱ2", Some((0, 8)))
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mat!(uni_not, r"\PN+", "abⅠ", Some((0, 2)))
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mat!(uni_not, r"\PN+", "abⅠ", Some((0, 2)))
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mat!(uni_not_class, r"[\PN]+", "abⅠ", Some((0, 2)))
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mat!(uni_not_class, r"[\PN]+", "abⅠ", Some((0, 2)))
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mat!(uni_not_class_neg, r"[^\PN]+", "abⅠ", Some((2, 5)))
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mat!(uni_not_class_neg, r"[^\PN]+", "abⅠ", Some((2, 5)))
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mat!(uni_case, r"(?i)Δ", "δ", Some((0, 2)))
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mat!(uni_case, r"(?i)Δ", "δ", Some((0, 2)))
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mat!(uni_case_not, r"Δ", "δ", None)
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//mat!(uni_case_not, r"Δ", "δ", None)
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mat!(uni_case_upper, r"\p{Lu}+", "ΛΘΓΔα", Some((0, 8)))
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mat!(uni_case_upper, r"\p{Lu}+", "ΛΘΓΔα", Some((0, 8)))
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mat!(uni_case_upper_nocase_flag, r"(?i)\p{Lu}+", "ΛΘΓΔα", Some((0, 10)))
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mat!(uni_case_upper_nocase_flag, r"(?i)\p{Lu}+", "ΛΘΓΔα", Some((0, 10)))
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mat!(uni_case_upper_nocase, r"\p{L}+", "ΛΘΓΔα", Some((0, 10)))
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mat!(uni_case_upper_nocase, r"\p{L}+", "ΛΘΓΔα", Some((0, 10)))
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@ -461,6 +461,38 @@ impl OwnedAsciiExt for Vec<u8> {
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}
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}
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}
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}
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/// Returns a 'default' ASCII and C++11-like literal escape of a `u8`
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///
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/// The default is chosen with a bias toward producing literals that are
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/// legal in a variety of languages, including C++11 and similar C-family
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/// languages. The exact rules are:
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///
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/// - Tab, CR and LF are escaped as '\t', '\r' and '\n' respectively.
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/// - Single-quote, double-quote and backslash chars are backslash-escaped.
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/// - Any other chars in the range [0x20,0x7e] are not escaped.
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/// - Any other chars are given hex escapes.
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/// - Unicode escapes are never generated by this function.
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pub fn escape_default(c: u8, f: |u8|) {
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match c {
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b'\t' => { f(b'\\'); f(b't'); }
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b'\r' => { f(b'\\'); f(b'r'); }
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b'\n' => { f(b'\\'); f(b'n'); }
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b'\\' => { f(b'\\'); f(b'\\'); }
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b'\'' => { f(b'\\'); f(b'\''); }
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b'"' => { f(b'\\'); f(b'"'); }
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b'\x20' ... b'\x7e' => { f(c); }
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_ => {
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f(b'\\');
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f(b'x');
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for &offset in [4u, 0u].iter() {
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match ((c as i32) >> offset) & 0xf {
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i @ 0 ... 9 => f(b'0' + (i as u8)),
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i => f(b'a' + (i as u8 - 10)),
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}
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}
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}
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}
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}
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pub static ASCII_LOWER_MAP: [u8, ..256] = [
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pub static ASCII_LOWER_MAP: [u8, ..256] = [
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0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
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0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
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@ -720,7 +720,11 @@ impl<'a> StringReader<'a> {
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/// Scan over `n_digits` hex digits, stopping at `delim`, reporting an
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/// Scan over `n_digits` hex digits, stopping at `delim`, reporting an
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/// error if too many or too few digits are encountered.
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/// error if too many or too few digits are encountered.
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fn scan_hex_digits(&mut self, n_digits: uint, delim: char) -> bool {
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fn scan_hex_digits(&mut self,
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n_digits: uint,
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delim: char,
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below_0x7f_only: bool)
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-> bool {
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debug!("scanning {} digits until {}", n_digits, delim);
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debug!("scanning {} digits until {}", n_digits, delim);
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let start_bpos = self.last_pos;
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let start_bpos = self.last_pos;
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let mut accum_int = 0;
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let mut accum_int = 0;
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@ -745,6 +749,13 @@ impl<'a> StringReader<'a> {
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self.bump();
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self.bump();
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}
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}
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if below_0x7f_only && accum_int >= 0x80 {
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self.err_span_(start_bpos,
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self.last_pos,
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"this form of character escape may only be used \
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with characters in the range [\\x00-\\x7f]");
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}
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match char::from_u32(accum_int) {
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match char::from_u32(accum_int) {
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Some(_) => true,
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Some(_) => true,
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None => {
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None => {
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@ -773,9 +784,13 @@ impl<'a> StringReader<'a> {
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Some(e) => {
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Some(e) => {
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return match e {
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return match e {
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'n' | 'r' | 't' | '\\' | '\'' | '"' | '0' => true,
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'n' | 'r' | 't' | '\\' | '\'' | '"' | '0' => true,
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'x' => self.scan_hex_digits(2u, delim),
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'x' => self.scan_hex_digits(2u, delim, !ascii_only),
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'u' if !ascii_only => self.scan_hex_digits(4u, delim),
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'u' if !ascii_only => {
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'U' if !ascii_only => self.scan_hex_digits(8u, delim),
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self.scan_hex_digits(4u, delim, false)
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}
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'U' if !ascii_only => {
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self.scan_hex_digits(8u, delim, false)
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}
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'\n' if delim == '"' => {
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'\n' if delim == '"' => {
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self.consume_whitespace();
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self.consume_whitespace();
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true
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true
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@ -30,6 +30,7 @@ use print::pp::{Breaks, Consistent, Inconsistent, eof};
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use print::pp;
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use print::pp;
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use ptr::P;
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use ptr::P;
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use std::ascii;
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use std::io::{IoResult, MemWriter};
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use std::io::{IoResult, MemWriter};
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use std::io;
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use std::io;
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use std::mem;
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use std::mem;
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@ -2776,7 +2777,7 @@ impl<'a> State<'a> {
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ast::LitStr(ref st, style) => self.print_string(st.get(), style),
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ast::LitStr(ref st, style) => self.print_string(st.get(), style),
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ast::LitByte(byte) => {
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ast::LitByte(byte) => {
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let mut res = String::from_str("b'");
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let mut res = String::from_str("b'");
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(byte as char).escape_default(|c| res.push(c));
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ascii::escape_default(byte, |c| res.push(c as char));
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res.push('\'');
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res.push('\'');
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word(&mut self.s, res.as_slice())
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word(&mut self.s, res.as_slice())
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}
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}
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@ -2821,8 +2822,12 @@ impl<'a> State<'a> {
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if val { word(&mut self.s, "true") } else { word(&mut self.s, "false") }
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if val { word(&mut self.s, "true") } else { word(&mut self.s, "false") }
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}
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}
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ast::LitBinary(ref v) => {
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ast::LitBinary(ref v) => {
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let escaped: String = v.iter().map(|&b| b as char).collect();
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let mut escaped: String = String::new();
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word(&mut self.s, format!("b\"{}\"", escaped.escape_default()).as_slice())
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for &ch in v.iter() {
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ascii::escape_default(ch as u8,
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|ch| escaped.push(ch as char));
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||||||
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}
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word(&mut self.s, format!("b\"{}\"", escaped).as_slice())
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}
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}
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}
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}
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}
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}
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File diff suppressed because it is too large
Load diff
17
src/test/compile-fail/ascii-only-character-escape.rs
Normal file
17
src/test/compile-fail/ascii-only-character-escape.rs
Normal file
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@ -0,0 +1,17 @@
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// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
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||||||
|
// file at the top-level directory of this distribution and at
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||||||
|
// http://rust-lang.org/COPYRIGHT.
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||||||
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//
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||||||
|
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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||||||
|
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
|
||||||
|
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
|
||||||
|
// option. This file may not be copied, modified, or distributed
|
||||||
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// except according to those terms.
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||||||
|
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||||||
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fn main() {
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let x = "\x80"; //~ ERROR may only be used
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let y = "\xff"; //~ ERROR may only be used
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let z = "\xe2"; //~ ERROR may only be used
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let a = b"\x00e2"; // ok because byte literal
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}
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|
|
@ -105,7 +105,7 @@ fn f() {
|
||||||
fn main() {
|
fn main() {
|
||||||
// Taken from http://www.unicode.org/Public/UNIDATA/PropList.txt
|
// Taken from http://www.unicode.org/Public/UNIDATA/PropList.txt
|
||||||
let chars =
|
let chars =
|
||||||
['\x0A', '\x0B', '\x0C', '\x0D', '\x20', '\x85', '\xA0', '\u1680',
|
['\x0A', '\x0B', '\x0C', '\x0D', '\x20', '\u0085', '\u00A0', '\u1680',
|
||||||
'\u2000', '\u2001', '\u2002', '\u2003', '\u2004', '\u2005', '\u2006',
|
'\u2000', '\u2001', '\u2002', '\u2003', '\u2004', '\u2005', '\u2006',
|
||||||
'\u2007', '\u2008', '\u2009', '\u200A', '\u2028', '\u2029', '\u202F',
|
'\u2007', '\u2008', '\u2009', '\u200A', '\u2028', '\u2029', '\u202F',
|
||||||
'\u205F', '\u3000'];
|
'\u205F', '\u3000'];
|
||||||
|
|
|
@ -99,10 +99,10 @@ fn f() {
|
||||||
fn main() {
|
fn main() {
|
||||||
// Taken from http://www.unicode.org/Public/UNIDATA/PropList.txt
|
// Taken from http://www.unicode.org/Public/UNIDATA/PropList.txt
|
||||||
let chars =
|
let chars =
|
||||||
['\x0A', '\x0B', '\x0C', '\x0D', '\x20', '\x85',
|
['\x0A', '\x0B', '\x0C', '\x0D', '\x20', '\u0085', '\u00A0', '\u1680',
|
||||||
'\xA0', '\u1680', '\u2000', '\u2001', '\u2002', '\u2003',
|
'\u2000', '\u2001', '\u2002', '\u2003', '\u2004', '\u2005', '\u2006',
|
||||||
'\u2004', '\u2005', '\u2006', '\u2007', '\u2008', '\u2009', '\u200A',
|
'\u2007', '\u2008', '\u2009', '\u200A', '\u2028', '\u2029', '\u202F',
|
||||||
'\u2028', '\u2029', '\u202F', '\u205F', '\u3000'];
|
'\u205F', '\u3000'];
|
||||||
for c in chars.iter() {
|
for c in chars.iter() {
|
||||||
let ws = c.is_whitespace();
|
let ws = c.is_whitespace();
|
||||||
println!("{} {}", c , ws);
|
println!("{} {}", c , ws);
|
||||||
|
|
Loading…
Reference in a new issue