mirror of https://github.com/rust-lang/book
79 lines
2.6 KiB
Rust
79 lines
2.6 KiB
Rust
use std::io;
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use std::io::Read;
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fn main() {
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let mut is_in_code_block = false;
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let mut is_in_inline_code = false;
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let mut is_in_html_tag = false;
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let mut buffer = String::new();
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if let Err(e) = io::stdin().read_to_string(&mut buffer) {
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panic!("{e}");
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}
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for line in buffer.lines() {
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if line.is_empty() {
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is_in_inline_code = false;
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}
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if line.starts_with("```") {
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is_in_code_block = !is_in_code_block;
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}
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if is_in_code_block {
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is_in_inline_code = false;
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is_in_html_tag = false;
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println!("{line}");
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} else {
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let modified_line = &mut String::new();
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let mut previous_char = std::char::REPLACEMENT_CHARACTER;
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let chars_in_line = line.chars();
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for possible_match in chars_in_line {
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// Check if inside inline code.
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if possible_match == '`' {
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is_in_inline_code = !is_in_inline_code;
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}
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// Check if inside HTML tag.
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if possible_match == '<' && !is_in_inline_code {
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is_in_html_tag = true;
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}
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if possible_match == '>' && !is_in_inline_code {
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is_in_html_tag = false;
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}
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// Replace with right/left apostrophe/quote.
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let char_to_push = if possible_match == '\''
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&& !is_in_inline_code
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&& !is_in_html_tag
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{
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if (previous_char != std::char::REPLACEMENT_CHARACTER
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&& !previous_char.is_whitespace())
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|| previous_char == '‘'
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{
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'’'
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} else {
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'‘'
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}
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} else if possible_match == '"'
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&& !is_in_inline_code
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&& !is_in_html_tag
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{
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if (previous_char != std::char::REPLACEMENT_CHARACTER
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&& !previous_char.is_whitespace())
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|| previous_char == '“'
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{
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'”'
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} else {
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'“'
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}
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} else {
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// Leave untouched.
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possible_match
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};
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modified_line.push(char_to_push);
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previous_char = char_to_push;
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}
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println!("{modified_line}");
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}
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}
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}
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