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Update implementing_lexer.md: Patched JFlex moved (#217)

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This broke the parallelism, so I had to rewrite nearly that whole sentence.
I also removed mention of the JFlex version number, which turned out to be a good idea as it seems that the IntelliJ fork is presently based on something like JFlex 1.7.0.

While checking my changes, I noticed that the sentence before that one looked a bit funny and fixed that, too.
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Samuel Bronson 2019-11-19 09:48:41 -05:00 committed by Yann Cébron
parent f29c5d3768
commit 79c8c6630b
1 changed files with 5 additions and 3 deletions
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reference_guide/custom_language_support/implementing_lexer.md
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@ -40,14 +40,16 @@ method, along with the start offset of the fragment to process, when lexing is r
Lexers used in other contexts can always return `0` from the `getState()` method.
The easiest way to create a lexer for a custom language plugin is to use [JFlex](https://jflex.de).
Adapter classes,
Classes
[FlexLexer](upsource:///platform/core-api/src/com/intellij/lexer/FlexLexer.java)
and
[FlexAdapter](upsource:///platform/core-api/src/com/intellij/lexer/FlexAdapter.java)
adapt JFlex lexers to the IntelliJ Platform Lexer API.
The source code of
We have a
[patched version of JFlex](https://github.com/JetBrains/intellij-deps-jflex)
that can be used with the lexer skeleton file located at *tools/lexer/idea-flex.skeleton* in the
[IntelliJ IDEA Community Edition](https://github.com/JetBrains/intellij-community)
includes a patched version of JFlex 1.4 located in *tools/lexer/jflex-1.4* and lexer skeleton file *tools/lexer/idea-flex.skeleton* which can be used for creating lexers compatible with
source to create lexers compatible with
[FlexAdapter](upsource:///platform/core-api/src/com/intellij/lexer/FlexAdapter.java).
The patched version of JFlex provides a new command line option `--charat` which changes the JFlex generated code so that it works with the IntelliJ Platform skeleton.
Enabling `--charat` option passes the source data for lexing as a