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esgraph
Advanced tools
Readme
creates a control flow graph from an esprima abstract syntax tree
$ npm install esgraph
The esgraph
binary reads from stdin and outputs dot-format usable by graphviz.
To create a png file showing the CFG of a js file:
$ cat $file | esgraph | dot -Tpng > output.png
const esgraph = require("esgraph");
const cfg = esgraph(esprima.parse(source, { range: true }));
// cfg[0] is the start node
// cfg[1] is the end node
// cfg[2] is an array of all nodes for easier iteration
// each node has:
node.astNode; // this is the original esprima AST node, either a statement or an expression
node.prev; // an array of predecessor nodes
node.next; // an array of all successor nodes
// the successor nodes are also awailable by type:
node.normal; // the next statement reached via normal flow
node.true; // the next statement reached when `node.astNode` evaluates to true
node.false; // the next statement reached when `node.astNode` evaluates to false
node.exception; // the next statement reached when `node.astNode` throws
const dot = esgraph.dot(cfg, { counter: startCount, source: source });
// returns the cfg printed in graphviz dot format.
node.label; // can be used to use a custom label for that node
// otherwise `esgraph.dot` will print the nodes source when the ast is created
// with {range: true} and {source: source} option is set
LGPLv3
FAQs
creates a control flow graph from an esprima abstract syntax tree
The npm package esgraph receives a total of 23 weekly downloads. As such, esgraph popularity was classified as not popular.
We found that esgraph demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 2 open source maintainers collaborating on the project.
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