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June 11, 2018 21:58
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build html tree with stack
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| class Node { | |
| constructor(value, parent) { | |
| this.value = value; | |
| this.parent = parent; | |
| this.children = []; | |
| } | |
| add(child) { | |
| this.children.push(child); | |
| } | |
| print(level=0) { | |
| let indent = ""; | |
| for (let i = 0; i < level * 2; i++) { | |
| indent += " "; | |
| } | |
| process.stdout.write(`${indent}value : ${this.value} \n`); | |
| if(this.children.length == 0) { | |
| process.stdout.write(`${indent}children: --- none\n`); | |
| } else { | |
| process.stdout.write(`${indent}children: --- below\n`); | |
| this.children.forEach(child => { | |
| child.print(level+1); | |
| }); | |
| } | |
| } | |
| } | |
| const tags = [ | |
| '<html>', '<head>', '<script>', '</script>', '</head>', | |
| '<body>','<div>', '</div>', '<div>', '</div>', '</body>', '</html>', | |
| ]; | |
| function isClosingTag(str) { | |
| return str.indexOf('</') >= 0; | |
| } | |
| function parse(tags) { | |
| let stack = []; | |
| let current; | |
| let root; | |
| tags.forEach( tag => { | |
| if(isClosingTag(tag)) { | |
| stack.pop(); | |
| current = current.parent; | |
| } else { | |
| stack.push(tag) | |
| let newNode = new Node(tag, current); | |
| if (root == null) { | |
| root = newNode; | |
| } | |
| if (current == null) { | |
| current = newNode; | |
| } else { | |
| current.add(newNode); | |
| current = newNode; | |
| } | |
| } | |
| }); | |
| root.print(); | |
| } | |
| parse(tags); | |
| // value : <html> | |
| // children: --- below | |
| // value : <head> | |
| // children: --- below | |
| // value : <script> | |
| // children: --- none | |
| // value : <body> | |
| // children: --- below | |
| // value : <div> | |
| // children: --- none | |
| // value : <div> | |
| // children: --- none | |
| // [Finished in 0.1s] |
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