The “estraverse” library allows you to parse a JavaScript AST (e.g. generated from ESPrima). <\/p>\n
When you use it, you pull in a Javascript file, parse it, and then run a set of callbacks over the tree.<\/p>\n
The two callbacks you can define are “enter” and “leave” which are called when each node is processed, and when it goes back up the stack past the node.<\/p>\n
As a convenience, they give you the parent node in “enter” but typically this isn’t enough – it’s more helpful to have the entire parent chain.<\/p>\n
To get this, you can simply make a Javascript array that you tree as a stack, then modify it as the traversal progresses:<\/p>\n
\nconst fs = require(\"fs\");\nconst esprima = require(\"esprima\");\nconst estraverse = require(\"estraverse\");\nconst filename = ...\n\nlet parentChain = [];\n\nconst ast = esprima.parse(\n fs.readFileSync(filename)\n);\n\nestraverse.traverse(ast, {\n enter: (node, parent) => {\n parentChain.push(node);\n },\n leave: (node) => {\n parentChain.pop();\n }\n});\n<\/pre>\n","protected":false},"excerpt":{"rendered":"How to get the parent chain of Javascript nodes when parsing Javascript using ESPrima + Estraverse<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[4],"tags":[302],"aioseo_notices":[],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/www.garysieling.com\/blog\/wp-json\/wp\/v2\/posts\/4263"}],"collection":[{"href":"https:\/\/www.garysieling.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.garysieling.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.garysieling.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.garysieling.com\/blog\/wp-json\/wp\/v2\/comments?post=4263"}],"version-history":[{"count":0,"href":"https:\/\/www.garysieling.com\/blog\/wp-json\/wp\/v2\/posts\/4263\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.garysieling.com\/blog\/wp-json\/wp\/v2\/media?parent=4263"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.garysieling.com\/blog\/wp-json\/wp\/v2\/categories?post=4263"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.garysieling.com\/blog\/wp-json\/wp\/v2\/tags?post=4263"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}