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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_01.dump
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@@ -17,4 +17,4 @@
@8|/+0#0000e05&@1| |T|h|e|r|e| |a|r|e| |S|P|A|C|E|,| |F@1|,| |H|T|,| |C|R|,| |a|n|d| |L|F| |a|f|t|e|r| |"@2|.| +0#0000000&@17
@8|S|t|r|i|n|g| |e|m|p|t|y| |=| |"@2| |^+0#0000e05&|L| +0#0000000&@2|^+0#0000e05&|M| +0#0000000&@40
| +0#e000002&@11|"+0#0000000&@2|;| @58
@57|1|9|,|3|-|9| @7|5|2|%|
@57|1|9|,|3|-|9| @7|1|5|%|