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runtime(java): Recognise string templates (#14150)

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As this is encouraged in the referenced JEPs, "to visually
distinguish a string template from a string literal, and
a text block template from a text block", the default
colours for java\%[Debug]StrTempl are made distinct from
java\%[Debug]String.

According to §3.2 Lexical Translations (JLS, c. 1996 or any
more recent version), line terminators, white space, and
comments are discarded before tokens are accepted. Since
a template expression comprises a template processor, a dot,
and a template, it may be visually appealing to break up
its head across a few lines whenever its tail already spans
multiple lines.  Curiously, no allowance for it is made in
the distributed tests for OpenJDK 21; the proposed regexp
patterns take in consideration a line terminator and white
space after a dot.

References:
https://openjdk.org/jeps/430 (Preview)
https://openjdk.org/jeps/459 (Second Preview)
https://openjdk.org/jeps/465

Signed-off-by: Aliaksei Budavei <0x000c70@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
This commit is contained in:
Aliaksei Budavei
2024-03-09 20:03:11 +03:00
committed by GitHub
parent 5d67aef306
commit a2c65809da
9 changed files with 165 additions and 35 deletions
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2
runtime/syntax/testdir/dumps/java_string_00.dump
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@@ -1,4 +1,4 @@
>c+0#00e0003#ffffff0|l|a|s@1| +0#0000000&|S|t|r|i|n|g|T|e|s|t|s| @57
>c+0#00e0003#ffffff0|l|a|s@1| +0#0000000&|S|t|r|i|n|g|T|e|s|t|s| @2|/+0#0000e05&@1| |J|D|K| |2|1|+| |(|-@1|e|n|a|b|l|e|-|p|r|e|v|i|e|w| |-@1|r|e|l|e|a|s|e| |2|1|)|.| +0#0000000&@11
|{| @73
@4|s+0#00e0003&|t|a|t|i|c| +0#0000000&|{| @62
@8|S|t|r|i|n|g| |s|1| |=| |"+0#e000002&|A| |q|u|i|c|k| |b|r|o|w|n| |f|o|x| |j|u|m|p|s| |o|v|e|r| |t|h|e| |l|a|z|y| |d|o|g|"|;+0#0000000&| @10