parser: separate off parser

[textlint]

parser: separate off parser

[azu]

I'v just implemeted markdown-to-ast parser.

• https://github.com/azu/markdown-to-ast/

It is dependent on jgm/CommonMark's parser.

[azu]

Maybe we need re-define the meaning of raw.

[label](http://example.com "title")

Is raw of theLink node [label](http://example.com "title") or label?

Do We have to introduce like value property for node?

Ah, the following markdown is parsed to Link node > Str Node.
so, we don't need value propety.
A user should use raw of Str node for linting.

[label](http://example.com "title")
/*
{
    "start_line": 1,
    "start_column": 1,
    "end_line": 0,
    "children": [
        {
            "start_line": 1,
            "start_column": 1,
            "end_line": 0,
            "inline_content": [
                {
                    "destination": "http://example.com",
                    "title": "title",
                    "label": [
                        {
                            "c": "label",
                            "raw": "label",
                            "loc": {
                                "start": {
                                    "line": 1,
                                    "column": 0
                                },
                                "end": {
                                    "line": 1,
                                    "column": 5
                                }
                            },
                            "range": [
                                0,
                                5
                            ],
                            "type": "Str"
                        }
                    ],
                    "raw": "[label](http://example.com \"title\")",
                    "loc": {
                        "start": {
                            "line": 1,
                            "column": 0
                        },
                        "end": {
                            "line": 1,
                            "column": 35
                        }
                    },
                    "range": [
                        0,
                        35
                    ],
                    "type": "Link"
                }
            ],
            "children": [],
            "raw": "[label](http://example.com \"title\")",
            "loc": {
                "start": {
                    "line": 1,
                    "column": 0
                },
                "end": {
                    "line": 1,
                    "column": 35
                }
            },
            "range": [
                0,
                35
            ],
            "type": "Paragraph"
        }
    ],
    "raw": "[label](http://example.com \"title\")",
    "loc": {
        "start": {
            "line": 1,
            "column": 0
        },
        "end": {
            "line": 1,
            "column": 35
        }
    },
    "range": [
        0,
        35
    ],
    "type": "Document"
}
*/

[azu]

landed https://github.com/azu/markdown-to-ast/ in 1.3.0!