Commit c5000f3abc5af622b60625081dd851aae564cd02
abstract extension node interaction
wanderer committed on 8/4/2017, 8:06:42 PMParent: 5368b260f7cabad0bf9d35cd4525524ae4bf8efe
Files changed
| index.js | changed |
| index.js | ||
|---|---|---|
| @@ -32,11 +32,11 @@ | ||
| 32 | 32 … | async _get (key) { |
| 33 | 33 … | let index = 0 |
| 34 | 34 … | let root = this.root |
| 35 | 35 … | while (key.length > index) { |
| 36 | - if (root['/'].extension) { | |
| 36 … | + if (isExtension(root)) { | |
| 37 | 37 … | let extensionIndex = 0 |
| 38 | - const extension = this.toTypedArray(root['/'].extension) | |
| 38 … | + const extension = this.toTypedArray(getExtension(root)) | |
| 39 | 39 … | let subKey |
| 40 | 40 … | // alll extension are padded to 8 bit alignment. So we need to update |
| 41 | 41 … | // the index later to count for the added padding |
| 42 | 42 … | let padLen |
| @@ -116,31 +116,27 @@ | ||
| 116 | 116 … | let keySegment = key[result.index] |
| 117 | 117 … | |
| 118 | 118 … | if (result.extensionIndex !== undefined) { |
| 119 | 119 … | // split the extension node in two |
| 120 | - let extension = this.toTypedArray(root['/'].extension) | |
| 120 … | + let extension = this.toTypedArray(getExtension(root)) | |
| 121 | 121 … | const extensionKey = extension[result.extensionIndex + 1] |
| 122 | 122 … | const remExtension = extension.subarray(1 - result.extensionIndex) |
| 123 | 123 … | extension = extension.subarray(0, result.extensionIndex) |
| 124 | 124 … | |
| 125 | - const node = root['/'].node | |
| 125 … | + const node = getNode(root) | |
| 126 | 126 … | let newNode |
| 127 | 127 … | // create the new extension node |
| 128 | 128 … | if (extension.length) { |
| 129 | - root['/'].extension = new Buffer(extension.buffer) | |
| 130 | - newNode = root['/'].node = [] | |
| 129 … | + setExtension(root, new Buffer(extension.buffer)) | |
| 130 … | + newNode = [] | |
| 131 … | + setNode(root, newNode) | |
| 131 | 132 … | } else { |
| 132 | 133 … | newNode = root['/'] = [] |
| 133 | 134 … | } |
| 134 | 135 … | |
| 135 | 136 … | // save the remainer of the extension node |
| 136 | 137 … | if (remExtension.length) { |
| 137 | - newNode[extensionKey] = { | |
| 138 | - '/': { | |
| 139 | - extension: new Buffer(remExtension.buffer), | |
| 140 | - node: node | |
| 141 | - } | |
| 142 | - } | |
| 138 … | + newNode[extensionKey] = createExtension(new Buffer(remExtension.buffer), node) | |
| 143 | 139 … | } else { |
| 144 | 140 … | newNode[extensionKey] = node |
| 145 | 141 … | } |
| 146 | 142 … | } |
| @@ -148,14 +144,9 @@ | ||
| 148 | 144 … | let newNode |
| 149 | 145 … | if (result.index + 1 < key.length) { |
| 150 | 146 … | // if there are remaning key segments create an extension node |
| 151 | 147 … | const extension = key.subarray(result.index + 1, key.length) |
| 152 | - newNode = { | |
| 153 | - '/': { | |
| 154 | - extension: new Buffer(extension.buffer), | |
| 155 | - node: value | |
| 156 | - } | |
| 157 | - } | |
| 148 … | + newNode = createExtension(new Buffer(extension.buffer), value) | |
| 158 | 149 … | } else { |
| 159 | 150 … | newNode = value |
| 160 | 151 … | } |
| 161 | 152 … | |
| @@ -223,11 +214,39 @@ | ||
| 223 | 214 … | } |
| 224 | 215 … | } |
| 225 | 216 … | |
| 226 | 217 … | function getBranch (node) { |
| 227 | - if (node['/'].extension) { | |
| 228 | - return node['/'].node | |
| 218 … | + if (isExtension(node)) { | |
| 219 … | + return getNode(node) | |
| 229 | 220 … | } else { |
| 230 | 221 … | return root['/'] |
| 231 | 222 … | } |
| 232 | 223 … | } |
| 233 | 224 … | |
| 225 … | +function isExtension (node) { | |
| 226 … | + return !!node['/'].extension | |
| 227 … | +} | |
| 228 … | + | |
| 229 … | +function getExtension (node) { | |
| 230 … | + return node['/'].extension | |
| 231 … | +} | |
| 232 … | + | |
| 233 … | +function getNode (node) { | |
| 234 … | + return node['/'].node | |
| 235 … | +} | |
| 236 … | + | |
| 237 … | +function setExtension (node, ex) { | |
| 238 … | + node['/'].extension = ex | |
| 239 … | +} | |
| 240 … | + | |
| 241 … | +function setNode (node, val) { | |
| 242 … | + node['/'].node = val | |
| 243 … | +} | |
| 244 … | + | |
| 245 … | +function createExtension(ex, node) { | |
| 246 … | + return { | |
| 247 … | + '/': { | |
| 248 … | + extension: ex, | |
| 249 … | + node: node | |
| 250 … | + } | |
| 251 … | + } | |
| 252 … | +} | |
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