Add simple tutorial on common APIs #38
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| ```ruby | ||
| require "syntax_tree" | ||
| tree = SyntaxTree.parse("puts 1+1") |
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Maybe we can use the name of the node we get here:
| tree = SyntaxTree.parse("puts 1+1") | |
| program = SyntaxTree.parse("puts 1+1") |
This will help in the following example to explain where statements is coming from.
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Maybe we could also do a pp program and show the output in this doc so readers can follow along which nodes we're accessing? Or just show the output like you did in other code snippets:
# => (program (statements (command (ident "puts") (args ((binary (int "1") :+ (int "1")))))))| tree = SyntaxTree.parse("puts 1+1") | ||
| ``` | ||
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| Everything with a block of code inside of it has a list of statements represented by a `SyntaxTree::Statements` node. |
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Here for example it's confusing if you don't know what kind of node is tree.
| Using `#child_nodes` we can get an array of child nodes for any particular `SyntaxTree::Node`. In this case, the command node's child nodes are the method name and the arguments. | ||
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| We are only interested in the arguments, so we can use the instance method `#arguments` to access the `Syntax::Args` node directly. | ||
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| ```ruby | ||
| puts_command.child_nodes | ||
| # => [(ident "puts"), (args ((binary (int "1") :+ (int "1"))))] | ||
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| args = puts_command.arguments | ||
| # => (args ((binary (int "1") :+ (int "1")))) | ||
| ``` |
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I think we should say this the other way around. The important info here is that you can access #arguments. #child_nodes is more of a helper method.
Here, we are only interested in the arguments, so we can use the instance method `#arguments` to access the `Syntax::Args` node directly.
```ruby
args = puts_command.arguments
# => (args ((binary (int "1") :+ (int "1"))))
```
Note that we can also get an array of child nodes for any particular `SyntaxTree::Node` using `#child_nodes`. In this case, the command node's child nodes would be the method name and the arguments.
```ruby
puts_command.child_nodes
# => [(ident "puts"), (args ((binary (int "1") :+ (int "1"))))]
```
kddnewton
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I like this PR very much! I added a bunch of documentation to the README that covers a bit of this, but certainly not all of it. I was wondering what you thought about creating an |
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Thanks for the review friends! I'm closing this for now since I'm not working on it. |
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I know you were looking for documentation on the visitor pattern, but I felt like this simple tutorial could make SyntaxTree more accessible for newbies. I've added a section for the visitor pattern, which I can work on next.
I'm not sure if the content good enough, so please give me feedback on that.
I chose to put it in a separate doc in the root folder because I don't want to crowd the main README doc.