forked from jasder/antlr
73 lines
2.7 KiB
Markdown
73 lines
2.7 KiB
Markdown
# Work in progress
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This document is a work in progress, and may or may not resemble the final
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documentation for creating a new language target (runtime+templates) for ANTLR 4.
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# Creating a runtime port
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## Development directory structure
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The directory structure for developing a new ANTLR 4 target does not have a required
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form. The following directory structure may be used to provide the same form as the
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ANTLR 4 reference code base. This form is especially recommended for developers who
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plan to port both the ANTLR 4 Tool *and* Runtime to a new language.
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/
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/runtime/[target]/
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/tool/src/org/antlr/v4/codegen/[target]Target.java
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/tool/resources/org/antlr/v4/tool/templates/codegen/[target]/[target].stg
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### Tracking progress against the reference repository
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To assist in updating your target as changes are made in the reference (Java) repository,
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you can include the reference repository as a submodule of the Git repository for your
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target. The submodule will also allow other users to see which commit your target is
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synchronized with. I included this submodule at the following location.
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/reference/antlr4
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The following command will add the submodule to your working repository.
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git submodule add -b "master" "git://github.com/antlr/antlr4.git" "reference/antlr4"
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*Note:* the C# target uses a special branch of ANTLR 4 as a reference. The branch "sharpen"
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is based on the "optimized" branch, but modified to operate as an input to the Sharpen tool
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for automatically converting Java code to C#. The submodule for this target was added
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using the following command.
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git submodule add -b "sharpen" "git://github.com/sharwell/antlr4.git" "reference/antlr4"
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## Release structure
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### Code generation support
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The target must provide a `.jar` file for the ANTLR 4 Tool to use for code generation.
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The key file to include is the following:
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/META-INF/services/org.antlr.v4.codegen.Target
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This file should contain the fully qualified name of the class extending `Target` for
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your runtime. This will likely look like the following.
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org.antlr.v4.codegen.[target]Target
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If you are providing multiple code generation targets in a single `.jar` file, you
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should include one line for each target. The C# code generation target provides the
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following entries.
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org.antlr.v4.codegen.CSharp2Target
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org.antlr.v4.codegen.CSharp3Target
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org.antlr.v4.codegen.CSharp4Target
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The code generation templates themselves are loaded by the runtime via the `TODO()`
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method. The default implementation (inherited from the `Target` superclass) will
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attempt to load the template from the following path in the `.jar` file.
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/org/antlr/v4/tool/templates/codegen/[target]/[target].stg
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### Runtime
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The runtime for a new target may be distributed in any form relevant to that target
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language.
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