(string, units)
| 1958 | } |
| 1959 | |
| 1960 | function utf8ToBytes (string, units) { |
| 1961 | units = units || Infinity |
| 1962 | var codePoint |
| 1963 | var length = string.length |
| 1964 | var leadSurrogate = null |
| 1965 | var bytes = [] |
| 1966 | |
| 1967 | for (var i = 0; i < length; ++i) { |
| 1968 | codePoint = string.charCodeAt(i) |
| 1969 | |
| 1970 | // is surrogate component |
| 1971 | if (codePoint > 0xD7FF && codePoint < 0xE000) { |
| 1972 | // last char was a lead |
| 1973 | if (!leadSurrogate) { |
| 1974 | // no lead yet |
| 1975 | if (codePoint > 0xDBFF) { |
| 1976 | // unexpected trail |
| 1977 | if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD) |
| 1978 | continue |
| 1979 | } else if (i + 1 === length) { |
| 1980 | // unpaired lead |
| 1981 | if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD) |
| 1982 | continue |
| 1983 | } |
| 1984 | |
| 1985 | // valid lead |
| 1986 | leadSurrogate = codePoint |
| 1987 | |
| 1988 | continue |
| 1989 | } |
| 1990 | |
| 1991 | // 2 leads in a row |
| 1992 | if (codePoint < 0xDC00) { |
| 1993 | if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD) |
| 1994 | leadSurrogate = codePoint |
| 1995 | continue |
| 1996 | } |
| 1997 | |
| 1998 | // valid surrogate pair |
| 1999 | codePoint = (leadSurrogate - 0xD800 << 10 | codePoint - 0xDC00) + 0x10000 |
| 2000 | } else if (leadSurrogate) { |
| 2001 | // valid bmp char, but last char was a lead |
| 2002 | if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD) |
| 2003 | } |
| 2004 | |
| 2005 | leadSurrogate = null |
| 2006 | |
| 2007 | // encode utf8 |
| 2008 | if (codePoint < 0x80) { |
| 2009 | if ((units -= 1) < 0) break |
| 2010 | bytes.push(codePoint) |
| 2011 | } else if (codePoint < 0x800) { |
| 2012 | if ((units -= 2) < 0) break |
| 2013 | bytes.push( |
| 2014 | codePoint >> 0x6 | 0xC0, |
| 2015 | codePoint & 0x3F | 0x80 |
| 2016 | ) |
| 2017 | } else if (codePoint < 0x10000) { |
no outgoing calls
no test coverage detected