src/utils/markdown_parser.py

"""Markdown Parser Utilities"""

import re
from typing import List, Dict, Optional, Tuple
from dataclasses import dataclass
from pathlib import Path


@dataclass
class CodeBlock:
    """Represents a code block in markdown"""

    language: str
    content: str
    start_line: int
    end_line: int


@dataclass
class MarkdownHeading:
    """Represents a heading in markdown"""

    level: int
    text: str
    line: int


class MarkdownParser:
    """Parse and process markdown files"""

    def __init__(self, content: Optional[str] = None):
        self.content = content or ""

    def parse(self, content: str) -> "MarkdownParser":
        """Parse content and return self"""
        self.content = content
        return self

    def extract_code_blocks(self) -> List[CodeBlock]:
        """Extract all code blocks"""
        pattern = r"```(\w*)\n([\s\S]*?)```"
        blocks = []

        for match in re.finditer(pattern, self.content):
            blocks.append(
                CodeBlock(
                    language=match.group(1),
                    content=match.group(2).rstrip(),
                    start_line=self.content[:match.start()].count("\n") + 1,
                    end_line=self.content[:match.end()].count("\n") + 1,
                )
            )

        return blocks

    def extract_headings(self) -> List[MarkdownHeading]:
        """Extract all headings"""
        pattern = r"^(#{1,6})\s+(.+)$"
        headings = []

        for i, line in enumerate(self.content.split("\n"), 1):
            match = re.match(pattern, line.strip())
            if match:
                headings.append(
                    MarkdownHeading(
                        level=len(match.group(1)),
                        text=match.group(2),
                        line=i,
                    )
                )

        return headings

    def extract_links(self) -> List[Tuple[str, str]]:
        """Extract all markdown links"""
        pattern = r"\[([^\]]+)\]\(([^\)]+)\)"
        return [(title, url) for title, url in re.findall(pattern, self.content)]

    def extract_images(self) -> List[Tuple[str, str]]:
        """Extract all markdown images"""
        pattern = r"!\[([^\]]*)\]\(([^\)]+)\)"
        return [(alt, url) for alt, url in re.findall(pattern, self.content)]

    def extract_tables(self) -> List[List[List[str]]]:
        """Extract all tables"""
        lines = self.content.split("\n")
        tables = []

        in_table = False
        current_table: List[List[str]] = []
        alignment: List[str] = []

        for line in lines:
            if re.match(r"\|.*\|$", line.strip()):
                if re.match(r"\|[-:\s]+\|$", line.strip()):
                    alignment = [
                        "left" if ":" in c and c.count(":") == 1 and c.strip().startswith(":")
                        else "right" if ":" in c and c.count(":") == 1 and c.strip().endswith(":")
                        else "center" if ":" in c and c.count(":") == 2
                        else "left"
                        for c in line.strip().split("|")[1:-1]
                    ]
                    tables.append(current_table)
                    current_table = []
                    in_table = False
                    continue

                in_table = True
                row = [cell.strip() for cell in line.strip().split("|")[1:-1]]
                current_table.append(row)
            else:
                if in_table and current_table:
                    tables.append(current_table)
                    current_table = []
                    in_table = False

        if current_table:
            tables.append(current_table)

        return tables

    def extract_lists(self) -> Dict[str, List[str]]:
        """Extract all lists"""
        ordered: List[str] = []
        unordered: List[str] = []

        for line in self.content.split("\n"):
            ordered_match = re.match(r"^\d+\.\s+(.+)$", line.strip())
            if ordered_match:
                ordered.append(ordered_match.group(1))
                continue

            unordered_match = re.match(r"^[-*+]\s+(.+)$", line.strip())
            if unordered_match:
                unordered.append(unordered_match.group(1))

        return {"ordered": ordered, "unordered": unordered}

    def get_table_of_contents(self) -> List[Dict[str, Any]]:
        """Get table of contents from headings"""
        toc = []
        for heading in self.extract_headings():
            toc.append(
                {
                    "level": heading.level,
                    "text": heading.text,
                    "line": heading.line,
                }
            )
        return toc

    def convert_to_plain_text(self) -> str:
        """Strip markdown formatting for plain text"""
        text = self.content

        text = re.sub(r"```[\s\S]*?```", "", text)
        text = re.sub(r"`([^`]+)`", r"\1", text)
        text = re.sub(r"!\[([^\]]*)\]\([^\)]+\)", r"\1", text)
        text = re.sub(r"\[([^\]]+)\]\([^\)]+\)", r"\1", text)
        text = re.sub(r"^#{1,6}\s+", "", text, flags=re.MULTILINE)
        text = re.sub(r"\*\*([^*]+)\*\*", r"\1", text)
        text = re.sub(r"\*([^*]+)\*", r"\1", text)
        text = re.sub(r"__([^_]+)__", r"\1", text)
        text = re.sub(r"_([^_]+)_", r"\1", text)

        return text

    def search(self, query: str, case_sensitive: bool = False) -> List[Dict[str, Any]]:
        """Search for text in markdown"""
        results = []

        if not case_sensitive:
            search_content = self.content.lower()
            query = query.lower()
        else:
            search_content = self.content

        for i, line in enumerate(search_content.split("\n"), 1):
            if query in line:
                results.append({"line": i, "content": line.strip()})

        return results

    @classmethod
    def from_file(cls, file_path: str) -> "MarkdownParser":
        """Create parser from file"""
        content = Path(file_path).read_text(encoding="utf-8")
        return cls(content)