[PATCH v5 07/15] scripts: lib: netlink_yml_parser.py: use classes

As we'll be importing netlink parser into a Sphinx extension,
move all functions and global variables inside two classes:

- RstFormatters, containing ReST formatter logic, which are
  YAML independent;
- YnlDocGenerator: contains the actual parser classes. That's
  the only class that needs to be imported by the script or by
  a Sphinx extension.

With that, we won't pollute Sphinx namespace, avoiding any
potential clashes.

Signed-off-by: Mauro Carvalho Chehab <[email protected]>
---
 tools/net/ynl/pyynl/netlink_yml_parser.py | 594 +++++++++++-----------
 tools/net/ynl/pyynl/ynl_gen_rst.py        |  19 +-
 2 files changed, 314 insertions(+), 299 deletions(-)

diff --git a/tools/net/ynl/pyynl/netlink_yml_parser.py b/tools/net/ynl/pyynl/netlink_yml_parser.py
index 3c15b578f947..839e78b39de3 100755
--- a/tools/net/ynl/pyynl/netlink_yml_parser.py
+++ b/tools/net/ynl/pyynl/netlink_yml_parser.py
@@ -3,389 +3,407 @@
 # -*- coding: utf-8; mode: python -*-
 
 """
-    Script to auto generate the documentation for Netlink specifications.
+    Class to auto generate the documentation for Netlink specifications.
 
     :copyright:  Copyright (C) 2023  Breno Leitao <[email protected]>
     :license:    GPL Version 2, June 1991 see linux/COPYING for details.
 
-    This script performs extensive parsing to the Linux kernel's netlink YAML
+    This class performs extensive parsing to the Linux kernel's netlink YAML
     spec files, in an effort to avoid needing to heavily mark up the original
     YAML file.
 
-    This code is split in three big parts:
+    This code is split in two classes:
         1) RST formatters: Use to convert a string to a RST output
-        2) Parser helpers: Functions to parse the YAML data structure
-        3) Main function and small helpers
+        2) YAML Netlink (YNL) doc generator: Generate docs from YAML data
 """
 
 from typing import Any, Dict, List
 import os.path
+import sys
+import argparse
 import logging
 import yaml
 
 
-SPACE_PER_LEVEL = 4
-
-
+# ==============
 # RST Formatters
 # ==============
-def headroom(level: int) -> str:
-    """Return space to format"""
-    return " " * (level * SPACE_PER_LEVEL)
+class RstFormatters:
+    SPACE_PER_LEVEL = 4
 
+    @staticmethod
+    def headroom(level: int) -> str:
+        """Return space to format"""
+        return " " * (level * RstFormatters.SPACE_PER_LEVEL)
 
-def bold(text: str) -> str:
-    """Format bold text"""
-    return f"**{text}**"
 
+    @staticmethod
+    def bold(text: str) -> str:
+        """Format bold text"""
+        return f"**{text}**"
 
-def inline(text: str) -> str:
-    """Format inline text"""
-    return f"``{text}``"
 
+    @staticmethod
+    def inline(text: str) -> str:
+        """Format inline text"""
+        return f"``{text}``"
 
-def sanitize(text: str) -> str:
-    """Remove newlines and multiple spaces"""
-    # This is useful for some fields that are spread across multiple lines
-    return str(text).replace("\n", " ").strip()
 
+    @staticmethod
+    def sanitize(text: str) -> str:
+        """Remove newlines and multiple spaces"""
+        # This is useful for some fields that are spread across multiple lines
+        return str(text).replace("\n", " ").strip()
 
-def rst_fields(key: str, value: str, level: int = 0) -> str:
-    """Return a RST formatted field"""
-    return headroom(level) + f":{key}: {value}"
 
+    def rst_fields(self, key: str, value: str, level: int = 0) -> str:
+        """Return a RST formatted field"""
+        return self.headroom(level) + f":{key}: {value}"
 
-def rst_definition(key: str, value: Any, level: int = 0) -> str:
-    """Format a single rst definition"""
-    return headroom(level) + key + "\n" + headroom(level + 1) + str(value)
 
+    def rst_definition(self, key: str, value: Any, level: int = 0) -> str:
+        """Format a single rst definition"""
+        return self.headroom(level) + key + "\n" + self.headroom(level + 1) + str(value)
 
-def rst_paragraph(paragraph: str, level: int = 0) -> str:
-    """Return a formatted paragraph"""
-    return headroom(level) + paragraph
 
+    def rst_paragraph(self, paragraph: str, level: int = 0) -> str:
+        """Return a formatted paragraph"""
+        return self.headroom(level) + paragraph
 
-def rst_bullet(item: str, level: int = 0) -> str:
-    """Return a formatted a bullet"""
-    return headroom(level) + f"- {item}"
 
+    def rst_bullet(self, item: str, level: int = 0) -> str:
+        """Return a formatted a bullet"""
+        return self.headroom(level) + f"- {item}"
 
-def rst_subsection(title: str) -> str:
-    """Add a sub-section to the document"""
-    return f"{title}\n" + "-" * len(title)
 
+    @staticmethod
+    def rst_subsection(title: str) -> str:
+        """Add a sub-section to the document"""
+        return f"{title}\n" + "-" * len(title)
 
-def rst_subsubsection(title: str) -> str:
-    """Add a sub-sub-section to the document"""
-    return f"{title}\n" + "~" * len(title)
 
+    @staticmethod
+    def rst_subsubsection(title: str) -> str:
+        """Add a sub-sub-section to the document"""
+        return f"{title}\n" + "~" * len(title)
 
-def rst_section(namespace: str, prefix: str, title: str) -> str:
-    """Add a section to the document"""
-    return f".. _{namespace}-{prefix}-{title}:\n\n{title}\n" + "=" * len(title)
 
+    @staticmethod
+    def rst_section(namespace: str, prefix: str, title: str) -> str:
+        """Add a section to the document"""
+        return f".. _{namespace}-{prefix}-{title}:\n\n{title}\n" + "=" * len(title)
 
-def rst_subtitle(title: str) -> str:
-    """Add a subtitle to the document"""
-    return "\n" + "-" * len(title) + f"\n{title}\n" + "-" * len(title) + "\n\n"
 
+    @staticmethod
+    def rst_subtitle(title: str) -> str:
+        """Add a subtitle to the document"""
+        return "\n" + "-" * len(title) + f"\n{title}\n" + "-" * len(title) + "\n\n"
 
-def rst_title(title: str) -> str:
-    """Add a title to the document"""
-    return "=" * len(title) + f"\n{title}\n" + "=" * len(title) + "\n\n"
 
+    @staticmethod
+    def rst_title(title: str) -> str:
+        """Add a title to the document"""
+        return "=" * len(title) + f"\n{title}\n" + "=" * len(title) + "\n\n"
 
-def rst_list_inline(list_: List[str], level: int = 0) -> str:
-    """Format a list using inlines"""
-    return headroom(level) + "[" + ", ".join(inline(i) for i in list_) + "]"
 
+    def rst_list_inline(self, list_: List[str], level: int = 0) -> str:
+        """Format a list using inlines"""
+        return self.headroom(level) + "[" + ", ".join(self.inline(i) for i in list_) + "]"
 
-def rst_ref(namespace: str, prefix: str, name: str) -> str:
-    """Add a hyperlink to the document"""
-    mappings = {'enum': 'definition',
-                'fixed-header': 'definition',
-                'nested-attributes': 'attribute-set',
-                'struct': 'definition'}
-    if prefix in mappings:
-        prefix = mappings[prefix]
-    return f":ref:`{namespace}-{prefix}-{name}`"
 
+    @staticmethod
+    def rst_ref(namespace: str, prefix: str, name: str) -> str:
+        """Add a hyperlink to the document"""
+        mappings = {'enum': 'definition',
+                    'fixed-header': 'definition',
+                    'nested-attributes': 'attribute-set',
+                    'struct': 'definition'}
+        if prefix in mappings:
+            prefix = mappings[prefix]
+        return f":ref:`{namespace}-{prefix}-{name}`"
 
-def rst_header() -> str:
-    """The headers for all the auto generated RST files"""
-    lines = []
 
-    lines.append(rst_paragraph(".. SPDX-License-Identifier: GPL-2.0"))
-    lines.append(rst_paragraph(".. NOTE: This document was auto-generated.\n\n"))
+    def rst_header(self) -> str:
+        """The headers for all the auto generated RST files"""
+        lines = []
 
-    return "\n".join(lines)
+        lines.append(self.rst_paragraph(".. SPDX-License-Identifier: GPL-2.0"))
+        lines.append(self.rst_paragraph(".. NOTE: This document was auto-generated.\n\n"))
 
+        return "\n".join(lines)
 
-def rst_toctree(maxdepth: int = 2) -> str:
-    """Generate a toctree RST primitive"""
-    lines = []
 
-    lines.append(".. toctree::")
-    lines.append(f"   :maxdepth: {maxdepth}\n\n")
+    @staticmethod
+    def rst_toctree(maxdepth: int = 2) -> str:
+        """Generate a toctree RST primitive"""
+        lines = []
 
-    return "\n".join(lines)
+        lines.append(".. toctree::")
+        lines.append(f"   :maxdepth: {maxdepth}\n\n")
 
+        return "\n".join(lines)
 
-def rst_label(title: str) -> str:
-    """Return a formatted label"""
-    return f".. _{title}:\n\n"
 
+    @staticmethod
+    def rst_label(title: str) -> str:
+        """Return a formatted label"""
+        return f".. _{title}:\n\n"
 
+# =======
 # Parsers
 # =======
+class YnlDocGenerator:
+
+    fmt = RstFormatters()
+
+    def parse_mcast_group(self, mcast_group: List[Dict[str, Any]]) -> str:
+        """Parse 'multicast' group list and return a formatted string"""
+        lines = []
+        for group in mcast_group:
+            lines.append(self.fmt.rst_bullet(group["name"]))
+
+        return "\n".join(lines)
+
+
+    def parse_do(self, do_dict: Dict[str, Any], level: int = 0) -> str:
+        """Parse 'do' section and return a formatted string"""
+        lines = []
+        for key in do_dict.keys():
+            lines.append(self.fmt.rst_paragraph(self.fmt.bold(key), level + 1))
+            if key in ['request', 'reply']:
+                lines.append(self.parse_do_attributes(do_dict[key], level + 1) + "\n")
+            else:
+                lines.append(self.fmt.headroom(level + 2) + do_dict[key] + "\n")
+
+        return "\n".join(lines)
+
+
+    def parse_do_attributes(self, attrs: Dict[str, Any], level: int = 0) -> str:
+        """Parse 'attributes' section"""
+        if "attributes" not in attrs:
+            return ""
+        lines = [self.fmt.rst_fields("attributes", self.fmt.rst_list_inline(attrs["attributes"]), level + 1)]
+
+        return "\n".join(lines)
+
+
+    def parse_operations(self, operations: List[Dict[str, Any]], namespace: str) -> str:
+        """Parse operations block"""
+        preprocessed = ["name", "doc", "title", "do", "dump", "flags"]
+        linkable = ["fixed-header", "attribute-set"]
+        lines = []
+
+        for operation in operations:
+            lines.append(self.fmt.rst_section(namespace, 'operation', operation["name"]))
+            lines.append(self.fmt.rst_paragraph(operation["doc"]) + "\n")
+
+            for key in operation.keys():
+                if key in preprocessed:
+                    # Skip the special fields
+                    continue
+                value = operation[key]
+                if key in linkable:
+                    value = self.fmt.rst_ref(namespace, key, value)
+                lines.append(self.fmt.rst_fields(key, value, 0))
+            if 'flags' in operation:
+                lines.append(self.fmt.rst_fields('flags', self.fmt.rst_list_inline(operation['flags'])))
+
+            if "do" in operation:
+                lines.append(self.fmt.rst_paragraph(":do:", 0))
+                lines.append(self.parse_do(operation["do"], 0))
+            if "dump" in operation:
+                lines.append(self.fmt.rst_paragraph(":dump:", 0))
+                lines.append(self.parse_do(operation["dump"], 0))
+
+            # New line after fields
+            lines.append("\n")
+
+        return "\n".join(lines)
+
+
+    def parse_entries(self, entries: List[Dict[str, Any]], level: int) -> str:
+        """Parse a list of entries"""
+        ignored = ["pad"]
+        lines = []
+        for entry in entries:
+            if isinstance(entry, dict):
+                # entries could be a list or a dictionary
+                field_name = entry.get("name", "")
+                if field_name in ignored:
+                    continue
+                type_ = entry.get("type")
+                if type_:
+                    field_name += f" ({self.fmt.inline(type_)})"
+                lines.append(
+                    self.fmt.rst_fields(field_name, self.fmt.sanitize(entry.get("doc", "")), level)
+                )
+            elif isinstance(entry, list):
+                lines.append(self.fmt.rst_list_inline(entry, level))
+            else:
+                lines.append(self.fmt.rst_bullet(self.fmt.inline(self.fmt.sanitize(entry)), level))
 
+        lines.append("\n")
+        return "\n".join(lines)
 
-def parse_mcast_group(mcast_group: List[Dict[str, Any]]) -> str:
-    """Parse 'multicast' group list and return a formatted string"""
-    lines = []
-    for group in mcast_group:
-        lines.append(rst_bullet(group["name"]))
-
-    return "\n".join(lines)
-
-
-def parse_do(do_dict: Dict[str, Any], level: int = 0) -> str:
-    """Parse 'do' section and return a formatted string"""
-    lines = []
-    for key in do_dict.keys():
-        lines.append(rst_paragraph(bold(key), level + 1))
-        if key in ['request', 'reply']:
-            lines.append(parse_do_attributes(do_dict[key], level + 1) + "\n")
-        else:
-            lines.append(headroom(level + 2) + do_dict[key] + "\n")
-
-    return "\n".join(lines)
-
-
-def parse_do_attributes(attrs: Dict[str, Any], level: int = 0) -> str:
-    """Parse 'attributes' section"""
-    if "attributes" not in attrs:
-        return ""
-    lines = [rst_fields("attributes", rst_list_inline(attrs["attributes"]), level + 1)]
-
-    return "\n".join(lines)
-
-
-def parse_operations(operations: List[Dict[str, Any]], namespace: str) -> str:
-    """Parse operations block"""
-    preprocessed = ["name", "doc", "title", "do", "dump", "flags"]
-    linkable = ["fixed-header", "attribute-set"]
-    lines = []
-
-    for operation in operations:
-        lines.append(rst_section(namespace, 'operation', operation["name"]))
-        lines.append(rst_paragraph(operation["doc"]) + "\n")
-
-        for key in operation.keys():
-            if key in preprocessed:
-                # Skip the special fields
-                continue
-            value = operation[key]
-            if key in linkable:
-                value = rst_ref(namespace, key, value)
-            lines.append(rst_fields(key, value, 0))
-        if 'flags' in operation:
-            lines.append(rst_fields('flags', rst_list_inline(operation['flags'])))
-
-        if "do" in operation:
-            lines.append(rst_paragraph(":do:", 0))
-            lines.append(parse_do(operation["do"], 0))
-        if "dump" in operation:
-            lines.append(rst_paragraph(":dump:", 0))
-            lines.append(parse_do(operation["dump"], 0))
 
-        # New line after fields
-        lines.append("\n")
+    def parse_definitions(self, defs: Dict[str, Any], namespace: str) -> str:
+        """Parse definitions section"""
+        preprocessed = ["name", "entries", "members"]
+        ignored = ["render-max"]  # This is not printed
+        lines = []
 
-    return "\n".join(lines)
-
-
-def parse_entries(entries: List[Dict[str, Any]], level: int) -> str:
-    """Parse a list of entries"""
-    ignored = ["pad"]
-    lines = []
-    for entry in entries:
-        if isinstance(entry, dict):
-            # entries could be a list or a dictionary
-            field_name = entry.get("name", "")
-            if field_name in ignored:
-                continue
-            type_ = entry.get("type")
-            if type_:
-                field_name += f" ({inline(type_)})"
-            lines.append(
-                rst_fields(field_name, sanitize(entry.get("doc", "")), level)
-            )
-        elif isinstance(entry, list):
-            lines.append(rst_list_inline(entry, level))
-        else:
-            lines.append(rst_bullet(inline(sanitize(entry)), level))
-
-    lines.append("\n")
-    return "\n".join(lines)
-
-
-def parse_definitions(defs: Dict[str, Any], namespace: str) -> str:
-    """Parse definitions section"""
-    preprocessed = ["name", "entries", "members"]
-    ignored = ["render-max"]  # This is not printed
-    lines = []
-
-    for definition in defs:
-        lines.append(rst_section(namespace, 'definition', definition["name"]))
-        for k in definition.keys():
-            if k in preprocessed + ignored:
-                continue
-            lines.append(rst_fields(k, sanitize(definition[k]), 0))
-
-        # Field list needs to finish with a new line
-        lines.append("\n")
-        if "entries" in definition:
-            lines.append(rst_paragraph(":entries:", 0))
-            lines.append(parse_entries(definition["entries"], 1))
-        if "members" in definition:
-            lines.append(rst_paragraph(":members:", 0))
-            lines.append(parse_entries(definition["members"], 1))
-
-    return "\n".join(lines)
-
-
-def parse_attr_sets(entries: List[Dict[str, Any]], namespace: str) -> str:
-    """Parse attribute from attribute-set"""
-    preprocessed = ["name", "type"]
-    linkable = ["enum", "nested-attributes", "struct", "sub-message"]
-    ignored = ["checks"]
-    lines = []
-
-    for entry in entries:
-        lines.append(rst_section(namespace, 'attribute-set', entry["name"]))
-        for attr in entry["attributes"]:
-            type_ = attr.get("type")
-            attr_line = attr["name"]
-            if type_:
-                # Add the attribute type in the same line
-                attr_line += f" ({inline(type_)})"
-
-            lines.append(rst_subsubsection(attr_line))
-
-            for k in attr.keys():
+        for definition in defs:
+            lines.append(self.fmt.rst_section(namespace, 'definition', definition["name"]))
+            for k in definition.keys():
                 if k in preprocessed + ignored:
                     continue
-                if k in linkable:
-                    value = rst_ref(namespace, k, attr[k])
-                else:
-                    value = sanitize(attr[k])
-                lines.append(rst_fields(k, value, 0))
+                lines.append(self.fmt.rst_fields(k, self.fmt.sanitize(definition[k]), 0))
+
+            # Field list needs to finish with a new line
             lines.append("\n")
+            if "entries" in definition:
+                lines.append(self.fmt.rst_paragraph(":entries:", 0))
+                lines.append(self.parse_entries(definition["entries"], 1))
+            if "members" in definition:
+                lines.append(self.fmt.rst_paragraph(":members:", 0))
+                lines.append(self.parse_entries(definition["members"], 1))
 
-    return "\n".join(lines)
+        return "\n".join(lines)
 
 
-def parse_sub_messages(entries: List[Dict[str, Any]], namespace: str) -> str:
-    """Parse sub-message definitions"""
-    lines = []
+    def parse_attr_sets(self, entries: List[Dict[str, Any]], namespace: str) -> str:
+        """Parse attribute from attribute-set"""
+        preprocessed = ["name", "type"]
+        linkable = ["enum", "nested-attributes", "struct", "sub-message"]
+        ignored = ["checks"]
+        lines = []
 
-    for entry in entries:
-        lines.append(rst_section(namespace, 'sub-message', entry["name"]))
-        for fmt in entry["formats"]:
-            value = fmt["value"]
+        for entry in entries:
+            lines.append(self.fmt.rst_section(namespace, 'attribute-set', entry["name"]))
+            for attr in entry["attributes"]:
+                type_ = attr.get("type")
+                attr_line = attr["name"]
+                if type_:
+                    # Add the attribute type in the same line
+                    attr_line += f" ({self.fmt.inline(type_)})"
 
-            lines.append(rst_bullet(bold(value)))
-            for attr in ['fixed-header', 'attribute-set']:
-                if attr in fmt:
-                    lines.append(rst_fields(attr,
-                                            rst_ref(namespace, attr, fmt[attr]),
-                                            1))
-            lines.append("\n")
+                lines.append(self.fmt.rst_subsubsection(attr_line))
+
+                for k in attr.keys():
+                    if k in preprocessed + ignored:
+                        continue
+                    if k in linkable:
+                        value = self.fmt.rst_ref(namespace, k, attr[k])
+                    else:
+                        value = self.fmt.sanitize(attr[k])
+                    lines.append(self.fmt.rst_fields(k, value, 0))
+                lines.append("\n")
+
+        return "\n".join(lines)
+
+
+    def parse_sub_messages(self, entries: List[Dict[str, Any]], namespace: str) -> str:
+        """Parse sub-message definitions"""
+        lines = []
+
+        for entry in entries:
+            lines.append(self.fmt.rst_section(namespace, 'sub-message', entry["name"]))
+            for fmt in entry["formats"]:
+                value = fmt["value"]
+
+                lines.append(self.fmt.rst_bullet(self.fmt.bold(value)))
+                for attr in ['fixed-header', 'attribute-set']:
+                    if attr in fmt:
+                        lines.append(self.fmt.rst_fields(attr,
+                                                self.fmt.rst_ref(namespace, attr, fmt[attr]),
+                                                1))
+                lines.append("\n")
+
+        return "\n".join(lines)
 
-    return "\n".join(lines)
 
+    def parse_yaml(self, obj: Dict[str, Any]) -> str:
+        """Format the whole YAML into a RST string"""
+        lines = []
 
-def parse_yaml(obj: Dict[str, Any]) -> str:
-    """Format the whole YAML into a RST string"""
-    lines = []
+        # Main header
 
-    # Main header
+        family = obj['name']
 
-    family = obj['name']
+        lines.append(self.fmt.rst_header())
+        lines.append(self.fmt.rst_label("netlink-" + family))
 
-    lines.append(rst_header())
-    lines.append(rst_label("netlink-" + family))
+        title = f"Family ``{family}`` netlink specification"
+        lines.append(self.fmt.rst_title(title))
+        lines.append(self.fmt.rst_paragraph(".. contents:: :depth: 3\n"))
 
-    title = f"Family ``{family}`` netlink specification"
-    lines.append(rst_title(title))
-    lines.append(rst_paragraph(".. contents:: :depth: 3\n"))
+        if "doc" in obj:
+            lines.append(self.fmt.rst_subtitle("Summary"))
+            lines.append(self.fmt.rst_paragraph(obj["doc"], 0))
 
-    if "doc" in obj:
-        lines.append(rst_subtitle("Summary"))
-        lines.append(rst_paragraph(obj["doc"], 0))
+        # Operations
+        if "operations" in obj:
+            lines.append(self.fmt.rst_subtitle("Operations"))
+            lines.append(self.parse_operations(obj["operations"]["list"], family))
 
-    # Operations
-    if "operations" in obj:
-        lines.append(rst_subtitle("Operations"))
-        lines.append(parse_operations(obj["operations"]["list"], family))
+        # Multicast groups
+        if "mcast-groups" in obj:
+            lines.append(self.fmt.rst_subtitle("Multicast groups"))
+            lines.append(self.parse_mcast_group(obj["mcast-groups"]["list"]))
 
-    # Multicast groups
-    if "mcast-groups" in obj:
-        lines.append(rst_subtitle("Multicast groups"))
-        lines.append(parse_mcast_group(obj["mcast-groups"]["list"]))
+        # Definitions
+        if "definitions" in obj:
+            lines.append(self.fmt.rst_subtitle("Definitions"))
+            lines.append(self.parse_definitions(obj["definitions"], family))
 
-    # Definitions
-    if "definitions" in obj:
-        lines.append(rst_subtitle("Definitions"))
-        lines.append(parse_definitions(obj["definitions"], family))
+        # Attributes set
+        if "attribute-sets" in obj:
+            lines.append(self.fmt.rst_subtitle("Attribute sets"))
+            lines.append(self.parse_attr_sets(obj["attribute-sets"], family))
 
-    # Attributes set
-    if "attribute-sets" in obj:
-        lines.append(rst_subtitle("Attribute sets"))
-        lines.append(parse_attr_sets(obj["attribute-sets"], family))
+        # Sub-messages
+        if "sub-messages" in obj:
+            lines.append(self.fmt.rst_subtitle("Sub-messages"))
+            lines.append(self.parse_sub_messages(obj["sub-messages"], family))
 
-    # Sub-messages
-    if "sub-messages" in obj:
-        lines.append(rst_subtitle("Sub-messages"))
-        lines.append(parse_sub_messages(obj["sub-messages"], family))
+        return "\n".join(lines)
 
-    return "\n".join(lines)
 
+    # Main functions
+    # ==============
 
-# Main functions
-# ==============
 
+    def parse_yaml_file(self, filename: str) -> str:
+        """Transform the YAML specified by filename into an RST-formatted string"""
+        with open(filename, "r", encoding="utf-8") as spec_file:
+            yaml_data = yaml.safe_load(spec_file)
+            content = self.parse_yaml(yaml_data)
 
-def parse_yaml_file(filename: str) -> str:
-    """Transform the YAML specified by filename into an RST-formatted string"""
-    with open(filename, "r", encoding="utf-8") as spec_file:
-        yaml_data = yaml.safe_load(spec_file)
-        content = parse_yaml(yaml_data)
+        return content
 
-    return content
 
+    def generate_main_index_rst(self, output: str, index_dir: str) -> None:
+        """Generate the `networking_spec/index` content and write to the file"""
+        lines = []
 
-def generate_main_index_rst(output: str, index_dir: str) -> str:
-    """Generate the `networking_spec/index` content and write to the file"""
-    lines = []
+        lines.append(self.fmt.rst_header())
+        lines.append(self.fmt.rst_label("specs"))
+        lines.append(self.fmt.rst_title("Netlink Family Specifications"))
+        lines.append(self.fmt.rst_toctree(1))
 
-    lines.append(rst_header())
-    lines.append(rst_label("specs"))
-    lines.append(rst_title("Netlink Family Specifications"))
-    lines.append(rst_toctree(1))
+        index_fname = os.path.basename(output)
+        base, ext = os.path.splitext(index_fname)
 
-    index_fname = os.path.basename(output)
-    base, ext = os.path.splitext(index_fname)
+        if not index_dir:
+            index_dir = os.path.dirname(output)
 
-    if not index_dir:
-        index_dir = os.path.dirname(output)
+        logging.debug(f"Looking for {ext} files in %s", index_dir)
+        for filename in sorted(os.listdir(index_dir)):
+            if not filename.endswith(ext) or filename == index_fname:
+                continue
+            base, ext = os.path.splitext(filename)
+            lines.append(f"   {base}\n")
 
-    logging.debug(f"Looking for {ext} files in %s", index_dir)
-    for filename in sorted(os.listdir(index_dir)):
-        if not filename.endswith(ext) or filename == index_fname:
-            continue
-        base, ext = os.path.splitext(filename)
-        lines.append(f"   {base}\n")
+        logging.debug("Writing an index file at %s", output)
 
-    return "".join(lines), output
+        return "".join(lines)
diff --git a/tools/net/ynl/pyynl/ynl_gen_rst.py b/tools/net/ynl/pyynl/ynl_gen_rst.py
index 38dafe3d9179..624b0960476e 100755
--- a/tools/net/ynl/pyynl/ynl_gen_rst.py
+++ b/tools/net/ynl/pyynl/ynl_gen_rst.py
@@ -10,12 +10,7 @@
 
     This script performs extensive parsing to the Linux kernel's netlink YAML
     spec files, in an effort to avoid needing to heavily mark up the original
-    YAML file.
-
-    This code is split in three big parts:
-        1) RST formatters: Use to convert a string to a RST output
-        2) Parser helpers: Functions to parse the YAML data structure
-        3) Main function and small helpers
+    YAML file. It uses the library code from scripts/lib.
 """
 
 import os.path
@@ -28,7 +23,7 @@ SRC_DIR = os.path.dirname(os.path.realpath(__file__))
 
 sys.path.insert(0, os.path.join(SRC_DIR, LIB_DIR))
 
-from netlink_yml_parser import parse_yaml_file, generate_main_index_rst
+from netlink_yml_parser import YnlDocGenerator
 
 
 def parse_arguments() -> argparse.Namespace:
@@ -76,10 +71,10 @@ def write_to_rstfile(content: str, filename: str) -> None:
         rst_file.write(content)
 
 
-def write_index_rst(output: str, index_dir: str) -> None:
+def write_index_rst(parser: YnlDocGenerator, output: str, index_dir: str) -> None:
     """Generate the `networking_spec/index` content and write to the file"""
 
-    msg = generate_main_index_rst(output, index_dir)
+    msg = parser.generate_main_index_rst(output, index_dir)
 
     logging.debug("Writing an index file at %s", output)
     write_to_rstfile(msg, output)
@@ -90,10 +85,12 @@ def main() -> None:
 
     args = parse_arguments()
 
+    parser = YnlDocGenerator()
+
     if args.input:
         logging.debug("Parsing %s", args.input)
         try:
-            content = parse_yaml_file(os.path.join(args.input))
+            content = parser.parse_yaml_file(os.path.join(args.input))
         except Exception as exception:
             logging.warning("Failed to parse %s.", args.input)
             logging.warning(exception)
@@ -103,7 +100,7 @@ def main() -> None:
 
     if args.index:
         # Generate the index RST file
-        write_index_rst(args.output, args.input_dir)
+        write_index_rst(parser, args.output, args.input_dir)
 
 
 if __name__ == "__main__":
-- 
2.49.0