[antlr-interest] ANTLR-based Java grammar for javac compiler
Sam Harwell
sharwell at pixelminegames.com
Mon Nov 10 23:28:38 PST 2008
I was able to use the Java.g grammar to create a syntax highlighter in a
skeleton Visual Studio language service in about 45 minutes today. It
was very easy to use from the clean work on it! :)
The lexer goes from 19000+ to just over 11000 lines, and codegen time is
cut in half or better if you do the following:
The last alt in each of IdentifierStart and IdentifierPart prevent those
rules from evaluating as sets. Change the IDENTIFIER rule to this:
IDENTIFIER
: (IdentifierStart | IdentifierStart2) (IdentifierPart |
IdentifierPart2)*
;
And move the last lines of IdentifierStart and IdentifierPart to the new
fragment rules IdentifierStart2 and IdentifierPart2 (they should no
longer be alts in IdentifierStart and IdentifierPart):
fragment
IdentifierStart2
: ('\ud800'..'\udbff') ('\udc00'..'\udfff')
;
fragment
IdentifierPart2
: ('\ud800'..'\udbff') ('\udc00'..'\udfff')
;
-----Original Message-----
From: antlr-interest-bounces at antlr.org
[mailto:antlr-interest-bounces at antlr.org] On Behalf Of Terence Parr
Sent: Monday, November 10, 2008 2:45 PM
To: antlr-interest Interest
Subject: [antlr-interest] ANTLR-based Java grammar for javac compiler
http://openjdk.java.net/projects/compiler-grammar/
Direct link to the grammar:
http://openjdk.java.net/projects/compiler-grammar/antlrworks/Java.g
USF MSCS student Yang Jiang built this as an intern for Sun.
Terence
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