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runtime(java): Improve the recognition of literals (#14120)

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* Emend the Unicode and octal escape sequence patterns;
* Accept the (repeated) underscore separators in all
  numerical literals;
* Recognise hexadecimal floating-point literals.

(The space escape sequence '\s' will be introduced along
with text blocks in another PR.)

References:
https://docs.oracle.com/javase/specs/jls/se17/html/jls-3.html#jls-3.3
https://docs.oracle.com/javase/specs/jls/se17/html/jls-3.html#jls-3.10.1
https://docs.oracle.com/javase/specs/jls/se17/html/jls-3.html#jls-3.10.2
https://docs.oracle.com/javase/specs/jls/se17/html/jls-3.html#jls-3.10.7


Signed-off-by: Aliaksei Budavei <0x000c70@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
This commit is contained in:
Aliaksei Budavei
2024-03-02 01:11:14 +03:00
committed by GitHub
parent c27fcf4857
commit 100a665634
17 changed files with 517 additions and 15 deletions
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runtime/syntax/testdir/dumps/java_escapes_01.dump Normal file
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