使用抽象语法树(AST)
对于高级用例,ts-graphviz/ast
模块提供了一个 API 来处理 DOT 语言图的抽象语法树(AST)。
可用函数
提供了以下函数:
fromModel
:将 Model 转换为 AST。toModel
:将 AST 转换为 Model。stringify
:将 AST 转换为 DOT 字符串。parse
:将 DOT 字符串转换为 AST。
备注
ts-graphviz
包提供的 toDot
函数是 fromModel
和 stringify
的组合。fromDot
函数是 parse
和 toModel
的组合。
示例
将 DOT 字符串解析为 AST
import { parse } from 'ts-graphviz/ast';
const ast = parse(`
digraph example {
node1 [
label = "My Node",
]
}
`);
console.log(JSON.stringify(ast, null, 2));
ast
变量现在包含 DOT 图的 AST 表示,您可以通过编程方式对其进行操作。
点击查看 AST 结构
{
"type": "Dot",
"location": {
"start": { "offset": 3, "line": 2, "column": 3 },
"end": { "offset": 68, "line": 7, "column": 1 }
},
"children": [
{
"id": {
"value": "example",
"quoted": false,
"type": "Literal",
"location": {
"start": { "offset": 11, "line": 2, "column": 11 },
"end": { "offset": 18, "line": 2, "column": 18 }
},
"children": []
},
"directed": true,
"strict": false,
"type": "Graph",
"location": {
"start": { "offset": 3, "line": 2, "column": 3 },
"end": { "offset": 67, "line": 6, "column": 4 }
},
"children": [
{
"id": {
"value": "node1",
"quoted": false,
"type": "Literal",
"location": {
"start": { "offset": 25, "line": 3, "column": 5 },
"end": { "offset": 30, "line": 3, "column": 10 }
},
"children": []
},
"type": "Node",
"location": {
"start": { "offset": 25, "line": 3, "column": 5 },
"end": { "offset": 63, "line": 5, "column": 6 }
},
"children": [
{
"key": {
"value": "label",
"quoted": false,
"type": "Literal",
"location": {
"start": { "offset": 39, "line": 4, "column": 7 },
"end": { "offset": 44, "line": 4, "column": 12 }
},
"children": []
},
"value": {
"value": "My Node",
"quoted": true,
"type": "Literal",
"location": {
"start": { "offset": 47, "line": 4, "column": 15 },
"end": { "offset": 56, "line": 4, "column": 24 }
},
"children": []
},
"location": {
"start": { "offset": 39, "line": 4, "column": 7 },
"end": { "offset": 57, "line": 4, "column": 25 }
},
"type": "Attribute",
"children": []
}
]
}
]
}
]
}