Struct CodeBlockUtils 

pub struct CodeBlockUtils;

Utility functions for detecting and handling code blocks in Markdown documents

Implementations

impl CodeBlockUtils

pub fn is_in_code_block(content: &str, line_num: usize) -> bool

Check if a line is inside a code block

pub fn is_code_block_delimiter(line: &str) -> bool

Check if a line is a code block delimiter (start or end)

pub fn is_code_block_start(line: &str) -> bool

Check if a line is the start of a code block

pub fn is_code_block_end(line: &str) -> bool

Check if a line is the end of a code block

pub fn is_indented_code_block(line: &str) -> bool

Check if a line is an indented code block (4+ columns of leading whitespace)

pub fn get_language_specifier(line: &str) -> Option<String>

Extracts the language specifier from a fenced code block start line

This function parses the line that starts a fenced code block (using either ``` or ~~~) and extracts the language specifier that follows the fence markers.

Parameters

• line - The line of text that potentially contains a code block start with language specifier

Returns

• Some(String) - The language specifier if found
• None - If the line is not a code block start or has no language specifier

Examples

use rumdl_lib::rules::code_block_utils::CodeBlockUtils;

let specifier = CodeBlockUtils::get_language_specifier("```rust");
assert_eq!(specifier, Some("rust".to_string()));

let specifier = CodeBlockUtils::get_language_specifier("~~~python");
assert_eq!(specifier, Some("python".to_string()));

let specifier = CodeBlockUtils::get_language_specifier("```");
assert_eq!(specifier, None);

pub fn identify_code_block_lines(content: &str) -> Vec<bool>

Identify which lines in the content are in code blocks

This function analyzes Markdown content and determines which lines are part of code blocks, including both fenced code blocks (``` or ~~~) and indented code blocks.

Algorithm

• Iterates through each line of content
• Tracks state for fenced code blocks (toggled by fence delimiters)
• Detects indented code blocks (4 spaces or 1 tab)
• Handles nested code blocks appropriately

Parameters

• content - The full Markdown content to analyze

Returns

A vector of boolean values with the same length as the number of lines in the input content. Each element indicates whether the corresponding line is inside a code block:

• true - The line is inside a code block
• false - The line is not inside a code block

Examples

use rumdl_lib::rules::code_block_utils::CodeBlockUtils;

let content = "Some text\n```rust\nlet x = 1;\n```\nMore text";
let in_code_block = CodeBlockUtils::identify_code_block_lines(content);
assert_eq!(in_code_block, vec![false, true, true, true, false]);