diff options
Diffstat (limited to 'src/nvim/mbyte.c')
| -rw-r--r-- | src/nvim/mbyte.c | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/src/nvim/mbyte.c b/src/nvim/mbyte.c index 6d188c6cd0..ec4f4cbc21 100644 --- a/src/nvim/mbyte.c +++ b/src/nvim/mbyte.c @@ -1624,6 +1624,146 @@ int utf_head_off(const char_u *base, const char_u *p) return (int)(p - q); } +// Whether space is NOT allowed before/after 'c'. +bool utf_eat_space(int cc) + FUNC_ATTR_CONST FUNC_ATTR_WARN_UNUSED_RESULT +{ + return (cc >= 0x2000 && cc <= 0x206F) // General punctuations + || (cc >= 0x2e00 && cc <= 0x2e7f) // Supplemental punctuations + || (cc >= 0x3000 && cc <= 0x303f) // CJK symbols and punctuations + || (cc >= 0xff01 && cc <= 0xff0f) // Full width ASCII punctuations + || (cc >= 0xff1a && cc <= 0xff20) // .. + || (cc >= 0xff3b && cc <= 0xff40) // .. + || (cc >= 0xff5b && cc <= 0xff65); // .. +} + +// Whether line break is allowed before "cc". +bool utf_allow_break_before(int cc) + FUNC_ATTR_CONST FUNC_ATTR_WARN_UNUSED_RESULT +{ + static const int BOL_prohibition_punct[] = { + '!', + '%', + ')', + ',', + ':', + ';', + '>', + '?', + ']', + '}', + 0x2019, // ’ right single quotation mark + 0x201d, // ” right double quotation mark + 0x2020, // † dagger + 0x2021, // ‡ double dagger + 0x2026, // … horizontal ellipsis + 0x2030, // ‰ per mille sign + 0x2031, // ‱ per then thousand sign + 0x203c, // ‼ double exclamation mark + 0x2047, // ⁇ double question mark + 0x2048, // ⁈ question exclamation mark + 0x2049, // ⁉ exclamation question mark + 0x2103, // ℃ degree celsius + 0x2109, // ℉ degree fahrenheit + 0x3001, // 、 ideographic comma + 0x3002, // 。 ideographic full stop + 0x3009, // 〉 right angle bracket + 0x300b, // 》 right double angle bracket + 0x300d, // 」 right corner bracket + 0x300f, // 』 right white corner bracket + 0x3011, // 】 right black lenticular bracket + 0x3015, // 〕 right tortoise shell bracket + 0x3017, // 〗 right white lenticular bracket + 0x3019, // 〙 right white tortoise shell bracket + 0x301b, // 〛 right white square bracket + 0xff01, // ！ fullwidth exclamation mark + 0xff09, // ） fullwidth right parenthesis + 0xff0c, // ， fullwidth comma + 0xff0e, // ． fullwidth full stop + 0xff1a, // ： fullwidth colon + 0xff1b, // ； fullwidth semicolon + 0xff1f, // ？ fullwidth question mark + 0xff3d, // ］ fullwidth right square bracket + 0xff5d, // ｝ fullwidth right curly bracket + }; + + int first = 0; + int last = ARRAY_SIZE(BOL_prohibition_punct) - 1; + + while (first < last) { + const int mid = (first + last) / 2; + + if (cc == BOL_prohibition_punct[mid]) { + return false; + } else if (cc > BOL_prohibition_punct[mid]) { + first = mid + 1; + } else { + last = mid - 1; + } + } + + return cc != BOL_prohibition_punct[first]; +} + +// Whether line break is allowed after "cc". +bool utf_allow_break_after(int cc) + FUNC_ATTR_CONST FUNC_ATTR_WARN_UNUSED_RESULT +{ + static const int EOL_prohibition_punct[] = { + '(', + '<', + '[', + '`', + '{', + // 0x2014, // — em dash + 0x2018, // ‘ left single quotation mark + 0x201c, // “ left double quotation mark + // 0x2053, // ～ swung dash + 0x3008, // 〈 left angle bracket + 0x300a, // 《 left double angle bracket + 0x300c, // 「 left corner bracket + 0x300e, // 『 left white corner bracket + 0x3010, // 【 left black lenticular bracket + 0x3014, // 〔 left tortoise shell bracket + 0x3016, // 〖 left white lenticular bracket + 0x3018, // 〘 left white tortoise shell bracket + 0x301a, // 〚 left white square bracket + 0xff08, // （ fullwidth left parenthesis + 0xff3b, // ［ fullwidth left square bracket + 0xff5b, // ｛ fullwidth left curly bracket + }; + + int first = 0; + int last = ARRAY_SIZE(EOL_prohibition_punct) - 1; + + while (first < last) { + const int mid = (first + last)/2; + + if (cc == EOL_prohibition_punct[mid]) { + return false; + } else if (cc > EOL_prohibition_punct[mid]) { + first = mid + 1; + } else { + last = mid - 1; + } + } + + return cc != EOL_prohibition_punct[first]; +} + +// Whether line break is allowed between "cc" and "ncc". +bool utf_allow_break(int cc, int ncc) + FUNC_ATTR_CONST FUNC_ATTR_WARN_UNUSED_RESULT +{ + // don't break between two-letter punctuations + if (cc == ncc + && (cc == 0x2014 // em dash + || cc == 0x2026)) { // horizontal ellipsis + return false; + } + return utf_allow_break_after(cc) && utf_allow_break_before(ncc); +} + /// Copy a character, advancing the pointers /// /// @param[in,out] fp Source of the character to copy. |