yaml-ast
Since the structure of YAML is whitespace-oriented, this tool allows you to visualize the structure of a YAML document as a directed graph. A major use-case for this tool is to visualize Abstract Syntax Trees (ASTs) that are serialized in YAML.
Requirements
You need Python 3.x, PyYAML, and GraphViz installed:
sudo pip install pyyaml
brew install graphviz
Usage
The show.py script will take a YAML file-path as a command line argument and will output a GraphViz directed graph to standard output.
python show.py test/sample.yaml > graph.gv # save output to a new file
dot -Tpdf graph.gv -o render.pdf # use GraphViz to render as PDF
Example
The following tree was generated from the YAML below it.
stmts:
-
name: vardeclstmt
vdecl:
node: vdecl
type: int
var: $a
exp:
name: funccall
globid: fib
params:
name: exps
exps:
-
name: binop
op: sub
lhs:
name: varval
var: $n
rhs:
name: lit
value: 1
-
name: vardeclstmt
vdecl:
node: vdecl
type: int
var: $b
exp:
name: funccall
globid: fib
params:
name: exps
exps:
-
name: binop
op: sub
lhs:
name: varval
var: $n
rhs:
name: lit
value: 2
-
name: ret
exp:
name: binop
op: add
lhs:
name: varval
var: $a
rhs:
name: varval
var: $b