Tweak Swift target doc.
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#### 1. Install ANTLR4
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[The getting started guide](getting-started.md) should get you started.
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Make sure you have the ANTLR
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installed.[The getting started guide](getting-started.md) should get
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you started.
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#### 2. create a Swift lexer or parser
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This is pretty much the same as creating a Java lexer or parser, except you need to specify the language target, for example:
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#### 2. create a Swift lexer or parser This is pretty much the same as
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creating a Java lexer or parser, except you need to specify the
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language target, for example:
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```
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$ antlr4 -Dlanguage=Swift MyGrammar.g4
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```
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For a full list of antlr4 tool options, please visit the [tool documentation page](tool-options.md).
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``` $ antlr4 -Dlanguage=Swift MyGrammar.g4 ``` For a full list of
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antlr4 tool options, please visit the
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[tool documentation page](tool-options.md).
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#### 3. Get the Swift ANTLR runtime
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Due to unstable ABI of Swift language, there will not be a single "library" for the Swift ANTLR runtime for now.
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#### 3. Build your Swift project with ANTLR runtime
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The following instructions are assuming Xcode as the IDE:
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* __Create parser/lexer__. Make sure the parsers/lexers generated in __step 2__ are added to the project. To do this, you can drag
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the generated files from Finder to the Xcode IDE. Remember to check __Copy items if needed__ to make sure
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the files are actually moved into the project folder instead of symbolic links (see the screenshot below). After moving you will be
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able to see your files in the project navigator. But when you open one of the files, you will see Xcode
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complaining the module "Antlr4" could not be found at the import statement. This is expected, since we still need the ANTLR Swift runtime for
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those missing symbols.
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* __Add parser/lexer to project__. Make sure the parsers/lexers
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generated in __step 2__ are added to the project. To do this, you can
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drag the generated files from Finder to the Xcode IDE. Remember to
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check __Copy items if needed__ to make sure the files are actually
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moved into the project folder instead of symbolic links (see the
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screenshot below). After moving you will be able to see your files in
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the project navigator. But when you open one of the files, you will
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see Xcode complaining the module "Antlr4" could not be found at the
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import statement. This is expected, since we still need the ANTLR
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Swift runtime for those missing symbols.
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<img src=images/dragfile.png>
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* __Download ANTLR runtime__. Clone the ANTLR repository. Open it in finder. From the root directory of the repo, go to runtime/Swift folder. You will be
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able to see the Xcode project manifest file: __Antlr4.xcodeproj__.
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* __Download ANTLR runtime__. Due to unstable ABI of Swift language,
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there will not be a single "library" for the Swift ANTLR runtime for
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now. To get Swift ANTLR runtime, clone the ANTLR repository. Open it
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in finder. From the root directory of the repo, go to runtime/Swift
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folder. You will see the Xcode project manifest file:
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__Antlr4.xcodeproj__.
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* __Import ANTLR Swift runtime into project__. Drag Antlr4.xcodeproj into your project, after this is done, your Xcode project navigator will be something
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like the screenshot below. In this case, your own project is "Smalltalk", and you will be able to see the Antlr4.xcodeproj
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shown as a contained project.
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* __Import ANTLR Swift runtime into project__. Drag Antlr4.xcodeproj
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into your project, after this is done, your Xcode project navigator
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will be something like the screenshot below. In this case, your own
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project is "Smalltalk", and you will be able to see the
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Antlr4.xcodeproj shown as a contained project. The error message will
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still be there, that's because we still need to tell Xcode how to find
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the runtime.
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<img src=images/xcodenav.png>
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* __Build ANTLR runtime__. And by opening the "Products" folder in the inner project (Antlr4.xcodeproj), you will see
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two Antlr4.framework files. ".framework" file is the swift version of ".jar", ".a" as in JAVA, C/C++
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Initially those two files should be red, that's because they are not built. To build, click the "target selection" button
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right next to your Xcode run button. And in the drop down select the target you want to build. And you will see the two
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Antlr4.framework files are for iOS and OSX. As shown below. After target selection, press "CMD+B", and Xcode will build
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the framework for you. Then you will see one of the frameworks become black.
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* __Build ANTLR runtime__. By expanding the "Products" folder in the
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inner project (Antlr4.xcodeproj), you will see two Antlr4.framework
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files. ".framework" file is the swift version of ".jar", ".a" as in
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JAVA, C/C++ Initially those two files should be red, that's because
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they are not built. To build, click the "target selection" button
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right next to your Xcode run button. And in the drop down select the
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target you want to build. And you will see the two Antlr4.framework
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files are for iOS and OSX, as shown below. After target selection,
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press "CMD+B", and Xcode will build the framework for you. Then you
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will see one of the frameworks become black.
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<img src=images/targetselection.png>
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** __Add dependencies__. Simply adding ANTLR Swift runtime and build the artifact is not enough. You still need to specify
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dependencies. Click your own project (Smalltalk), and you will see project setting page. Go to "Build Phase", and inside it
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make sure your ANTLR Swift runtime framework is added to both "__Target Dependencies__" and "__Link Binary With Libraries__"
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sections. As shown below.
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* __Add dependencies__. Simply adding ANTLR Swift runtime and build
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the artifact is not enough. You still need to specify
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dependencies. Click your own project (Smalltalk), and you will see
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project setting page. Go to "Build Phase", and inside it make sure
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your ANTLR Swift runtime framework is added to both "__Target
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Dependencies__" and "__Link Binary With Libraries__" sections, as
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shown below. After correctly added dependencies, the error message for
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importing library will be gone.
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<img src=images/xcodedep.png>
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@ -58,23 +78,22 @@ sections. As shown below.
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The Swift runtime includes an Xcode playground to get started with.
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In Xcode, open `antlr4/runtime/Swift/Antlr4.xcworkspace`. Select
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"Antlr4 OSX > My Mac" as the build target, and build the project as normal.
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The playground should then be active.
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First go to the ANTLR4 repository, and open
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`runtime/Swift/Antlr4.xcworkspace` in Xcode. Select "Antlr4 OSX > My
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Mac" as the build target, and build the project as normal. The
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playground should then be active.
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The playground includes a simple grammar called "Hello", and an example for
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walking the parse tree. You should see in the playground output that it is
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printing messages for each node in the parse tree as it walks.
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The playground includes a simple grammar called "Hello", and an
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example for walking the parse tree. You should see in the playground
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output that it is printing messages for each node in the parse tree as
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it walks.
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The playground shows how to create a lexer, token stream, and parser, and
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how to execute the parse.
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The grammar is defined in the playground's `Resources/Hello.g4`. The
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parser was generated from the grammar using ANTLR like this:
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The grammar is defined in the playground's `Resources/Hello.g4`. The parser
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was generated from the grammar using Antlr4 like this:
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```
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cd 'antlr4/runtime/Swift/Antlr4 playground.playground/Resources'
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```
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antlr4 -Dlanguage=Swift -visitor -o ../Sources/Autogen Hello.g4
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```
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The example tree walker is in `Sources/HelloWalker.swift`.
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The example tree walker is in Sources/HelloWalker.swift.
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