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10 KiB
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1 line
10 KiB
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{"version":3,"names":["_t","require","VISITOR_KEYS","findParent","callback","path","parentPath","find","getFunctionParent","p","isFunction","getStatementParent","Array","isArray","container","isStatement","isProgram","isFile","Error","getEarliestCommonAncestorFrom","paths","getDeepestCommonAncestorFrom","deepest","i","ancestries","earliest","keys","type","ancestry","listKey","key","earliestKeyIndex","indexOf","parentKey","currentKeyIndex","filter","length","minDepth","Infinity","lastCommonIndex","lastCommon","map","unshift","first","depthLoop","shouldMatch","getAncestry","push","isAncestor","maybeDescendant","isDescendant","maybeAncestor","parent","inType","candidateTypes","node"],"sources":["../../src/path/ancestry.ts"],"sourcesContent":["// This file contains that retrieve or validate anything related to the current paths ancestry.\n\nimport { VISITOR_KEYS } from \"@babel/types\";\nimport type * as t from \"@babel/types\";\nimport type NodePath from \"./index.ts\";\n\n/**\n * Starting at the parent path of the current `NodePath` and going up the\n * tree, return the first `NodePath` that causes the provided `callback`\n * to return a truthy value, or `null` if the `callback` never returns a\n * truthy value.\n */\n\nexport function findParent(\n this: NodePath,\n callback: (path: NodePath) => boolean,\n): NodePath | null {\n let path = this;\n while ((path = path.parentPath)) {\n if (callback(path)) return path;\n }\n return null;\n}\n\n/**\n * Starting at current `NodePath` and going up the tree, return the first\n * `NodePath` that causes the provided `callback` to return a truthy value,\n * or `null` if the `callback` never returns a truthy value.\n */\n\nexport function find(\n this: NodePath,\n callback: (path: NodePath) => boolean,\n): NodePath | null {\n let path = this;\n do {\n if (callback(path)) return path;\n } while ((path = path.parentPath));\n return null;\n}\n\n/**\n * Get the parent function of the current path.\n */\n\nexport function getFunctionParent(this: NodePath): NodePath<t.Function> | null {\n return this.findParent(p => p.isFunction()) as NodePath<t.Function> | null;\n}\n\n/**\n * Walk up the tree until we hit a parent node path in a list.\n */\n\nexport function getStatementParent(this: NodePath): NodePath<t.Statement> {\n let path = this;\n\n do {\n if (\n !path.parentPath ||\n (Array.isArray(path.container) && path.isStatement())\n ) {\n break;\n } else {\n path = path.parentPath;\n }\n } while (path);\n\n if (path && (path.isProgram() || path.isFile())) {\n throw new Error(\n \"File/Program node, we can't possibly find a statement parent to this\",\n );\n }\n\n return path as NodePath<t.Statement>;\n}\n\n/**\n * Get the deepest common ancestor and then from it, get the earliest relationship path\n * to that ancestor.\n *\n * Earliest is defined as being \"before\" all the other nodes in terms of list container\n * position and visiting key.\n */\n\nexport function getEarliestCommonAncestorFrom(\n this: NodePath,\n paths: Array<NodePath>,\n): NodePath {\n return this.getDeepestCommonAncestorFrom(\n paths,\n function (deepest, i, ancestries) {\n let earliest;\n const keys = VISITOR_KEYS[deepest.type];\n\n for (const ancestry of ancestries) {\n const path = ancestry[i + 1];\n\n // first path\n if (!earliest) {\n earliest = path;\n continue;\n }\n\n // handle containers\n if (path.listKey && earliest.listKey === path.listKey) {\n // we're in the same container so check if we're earlier\n if (path.key < earliest.key) {\n earliest = path;\n continue;\n }\n }\n\n // handle keys\n const earliestKeyIndex = keys.indexOf(earliest.parentKey);\n const currentKeyIndex = keys.indexOf(path.parentKey);\n if (earliestKeyIndex > currentKeyIndex) {\n // key appears before so it's earlier\n earliest = path;\n }\n }\n\n return earliest;\n },\n );\n}\n\n/**\n * Get the earliest path in the tree where the provided `paths` intersect.\n *\n * TODO: Possible optimisation target.\n */\n\nexport function getDeepestCommonAncestorFrom(\n this: NodePath,\n paths: Array<NodePath>,\n filter?: (deepest: NodePath, i: number, ancestries: NodePath[][]) => NodePath,\n): NodePath {\n if (!paths.length) {\n return this;\n }\n\n if (paths.length === 1) {\n return paths[0];\n }\n\n // minimum depth of the tree so we know the highest node\n let minDepth = Infinity;\n\n // last common ancestor\n let lastCommonIndex, lastCommon;\n\n // get the ancestors of the path, breaking when the parent exceeds ourselves\n const ancestries = paths.map(path => {\n const ancestry: NodePath[] = [];\n\n do {\n ancestry.unshift(path);\n } while ((path = path.parentPath) && path !== this);\n\n // save min depth to avoid going too far in\n if (ancestry.length < minDepth) {\n minDepth = ancestry.length;\n }\n\n return ancestry;\n });\n\n // get the first ancestry so we have a seed to assess all other ancestries with\n const first = ancestries[0];\n\n // check ancestor equality\n depthLoop: for (let i = 0; i < minDepth; i++) {\n const shouldMatch = first[i];\n\n for (const ancestry of ancestries) {\n if (ancestry[i] !== shouldMatch) {\n // we've hit a snag\n break depthLoop;\n }\n }\n\n // next iteration may break so store these so they can be returned\n lastCommonIndex = i;\n lastCommon = shouldMatch;\n }\n\n if (lastCommon) {\n if (filter) {\n return filter(lastCommon, lastCommonIndex, ancestries);\n } else {\n return lastCommon;\n }\n } else {\n throw new Error(\"Couldn't find intersection\");\n }\n}\n\n/**\n * Build an array of node paths containing the entire ancestry of the current node path.\n *\n * NOTE: The current node path is included in this.\n */\n\nexport function getAncestry(this: NodePath): Array<NodePath> {\n let path = this;\n const paths = [];\n do {\n paths.push(path);\n } while ((path = path.parentPath));\n return paths;\n}\n\n/**\n * A helper to find if `this` path is an ancestor of @param maybeDescendant\n */\nexport function isAncestor(this: NodePath, maybeDescendant: NodePath): boolean {\n return maybeDescendant.isDescendant(this);\n}\n\n/**\n * A helper to find if `this` path is a descendant of @param maybeAncestor\n */\nexport function isDescendant(this: NodePath, maybeAncestor: NodePath): boolean {\n return !!this.findParent(parent => parent === maybeAncestor);\n}\n\nexport function inType(this: NodePath, ...candidateTypes: string[]): boolean {\n let path = this;\n while (path) {\n for (const type of candidateTypes) {\n if (path.node.type === type) return true;\n }\n path = path.parentPath;\n }\n\n return 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