Lexical Translations in Java

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A raw Unicode character stream is translated into a sequence of tokens, using the following three lexical translation steps, which are applied in turn: 1 A translation of Unicode escapes ( 33) in the raw stream of Unicode characters to the corresponding Unicode character A Unicode escape of the form \uxxxx, where xxxx is a hexadecimal value, represents the UTF-16 code unit whose encoding is xxxx This translation step allows any program to be expressed using only ASCII characters 2 A translation of the Unicode stream resulting from step 1 into a stream of input characters and line terminators ( 34) 3 A translation of the stream of input characters and line terminators resulting from step 2 into a sequence of input elements ( 35) which, after white space ( 36) and comments ( 37) are discarded, comprise the tokens ( 35) that are the terminal symbols of the syntactic grammar ( 23)
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tion requires more than 16 bits The range of legal code points is now U+0000 to U+10FFFF, using the hexadecimal U+n notation Characters whose code points are greater than U+FFFF are called supplementary characters To represent the complete range of characters using only 16-bit units, the Unicode standard de nes an encoding called UTF-16 In this encoding, supplementary characters are represented as pairs of 16-bit code units, the rst from the high-surrogates range, (U+D800 to U+DBFF), the second from the low-surrogates range (U+DC00 to U+DFFF) For characters in the range U+0000 to U+FFFF, the values of code points and UTF-16 code units are the same The Java programming language represents text in sequences of 16-bit code units, using the UTF-16 encoding A few APIs, primarily in the Character class, use 32-bit integers to represent code points as individual entities The Java platform provides methods to convert between the two representations This book uses the terms code point and UTF-16 code unit where the representation is relevant, and the generic term character where the representation is irrelevant to the discussion Except for comments ( 37), identi ers, and the contents of character and string literals ( 3104, 3105), all input elements ( 35) in a program are formed only from ASCII characters (or Unicode escapes ( 33) which result in ASCII characters) ASCII (ANSI X34) is the American Standard Code for Information Interchange The rst 128 characters of the Unicode character encoding are the ASCII characters
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The longest possible translation is used at each step, even if the result does not ultimately make a correct program while another lexical translation would Thus the input characters a--b are tokenized ( 35) as a, --, b, which is not part of any grammatically correct program, even though the tokenization a, -, -, b could be part of a grammatically correct program
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UnicodeInputCharacter: UnicodeEscape RawInputCharacter
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UnicodeEscape: \ UnicodeMarker HexDigit HexDigit HexDigit HexDigit UnicodeMarker:
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RawInputCharacter: any Unicode character HexDigit: one of
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The \, u, and hexadecimal digits here are all ASCII characters In addition to the processing implied by the grammar, for each raw input character that is a backslash \, input processing must consider how many other \ characters contiguously precede it, separating it from a non-\ character or the start of the input stream If this number is even, then the \ is eligible to begin a Unicode escape; if the number is odd, then the \ is not eligible to begin a Unicode escape For example, the raw input "\\u2297=\u2297" results in the eleven characters " \ \ u 2 2 9 7 = " (\u2297 is the Unicode encoding of the character ) If an eligible \ is not followed by u, then it is treated as a RawInputCharacter and remains part of the escaped Unicode stream If an eligible \ is followed by u,
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