Marc Mintel
5397309103
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68 lines
2.8 KiB
Plaintext
68 lines
2.8 KiB
Plaintext
"use strict";
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var __importDefault = (this && this.__importDefault) || function (mod) {
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return (mod && mod.__esModule) ? mod : { "default": mod };
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};
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Object.defineProperty(exports, "__esModule", { value: true });
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const non_spacing_chars_1 = __importDefault(require("./non-spacing-chars"));
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const binary_search_1 = __importDefault(require("./binary-search"));
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/* The following two functions define the column width of an ISO 10646
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* character as follows:
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*
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* - The null character (U+0000) has a column width of 0.
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*
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* - Other C0/C1 control characters and DEL will lead to a return
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* value of -1.
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*
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* - Non-spacing and enclosing combining characters (general
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* category code Mn or Me in the Unicode database) have a
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* column width of 0.
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*
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* - SOFT HYPHEN (U+00AD) has a column width of 1.
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*
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* - Other format characters (general category code Cf in the Unicode
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* database) and ZERO WIDTH SPACE (U+200B) have a column width of 0.
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*
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* - Hangul Jamo medial vowels and final consonants (U+1160-U+11FF)
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* have a column width of 0.
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*
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* - Spacing characters in the East Asian Wide (W) or East Asian
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* Full-width (F) category as defined in Unicode Technical
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* Report #11 have a column width of 2.
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*
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* - All remaining characters (including all printable
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* ISO 8859-1 and WGL4 characters, Unicode control characters,
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* etc.) have a column width of 1.
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*
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* This implementation assumes that wchar_t characters are encoded
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* in ISO 10646.
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*/
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const mk_wcwidth = (ucs) => {
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/* test for 8-bit control characters */
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if (ucs === 0) {
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return 0;
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}
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if (ucs < 32 || (ucs >= 0x7f && ucs < 0xa0)) {
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return -1;
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}
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/* binary search in table of non-spacing characters */
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if ((0, binary_search_1.default)(ucs, non_spacing_chars_1.default, non_spacing_chars_1.default.length - 1)) {
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return 0;
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}
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/* if we arrive here, ucs is not a combining or C0/C1 control character */
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return (1 +
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Number(ucs >= 0x1100 &&
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(ucs <= 0x115f /* Hangul Jamo init. consonants */ ||
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ucs === 0x2329 ||
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ucs === 0x232a ||
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(ucs >= 0x2e80 && ucs <= 0xa4cf && ucs !== 0x303f) /* CJK ... Yi */ ||
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(ucs >= 0xac00 && ucs <= 0xd7a3) /* Hangul Syllables */ ||
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(ucs >= 0xf900 && ucs <= 0xfaff) /* CJK Compatibility Ideographs */ ||
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(ucs >= 0xfe10 && ucs <= 0xfe19) /* Vertical forms */ ||
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(ucs >= 0xfe30 && ucs <= 0xfe6f) /* CJK Compatibility Forms */ ||
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(ucs >= 0xff00 && ucs <= 0xff60) /* Fullwidth Forms */ ||
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(ucs >= 0xffe0 && ucs <= 0xffe6) ||
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(ucs >= 0x20000 && ucs <= 0x2fffd) ||
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(ucs >= 0x30000 && ucs <= 0x3fffd))));
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};
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exports.default = mk_wcwidth;
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