Move take_lines functions to mdbook-driver and make private

These functions are only used by the links preprocessor. I'm moving
these functions to put them closer to the code that they are associated
with, and to reduce the public API surface.

crates/mdbook-core/src/utils/mod.rs

@@ -6,16 +6,11 @@ use tracing::error;
 
 pub mod fs;
 mod html;
-mod string;
 mod toml_ext;
 
 pub(crate) use self::toml_ext::TomlExt;
 
 pub use self::html::{escape_html, escape_html_attribute};
-pub use self::string::{
-    take_anchored_lines, take_lines, take_rustdoc_include_anchored_lines,
-    take_rustdoc_include_lines,
-};
 
 /// Defines a `static` with a [`regex::Regex`].
 #[macro_export]

crates/mdbook-driver/src/builtin_preprocessors/links.rs

@@ -1,10 +1,10 @@
-use anyhow::{Context, Result};
-use mdbook_core::book::{Book, BookItem};
-use mdbook_core::static_regex;
-use mdbook_core::utils::{
+use self::take_lines::{
     take_anchored_lines, take_lines, take_rustdoc_include_anchored_lines,
     take_rustdoc_include_lines,
 };
+use anyhow::{Context, Result};
+use mdbook_core::book::{Book, BookItem};
+use mdbook_core::static_regex;
 use mdbook_preprocessor::{Preprocessor, PreprocessorContext};
 use regex::{CaptureMatches, Captures};
 use std::fs;
@@ -12,6 +12,8 @@ use std::ops::{Bound, Range, RangeBounds, RangeFrom, RangeFull, RangeTo};
 use std::path::{Path, PathBuf};
 use tracing::{error, warn};
 
+mod take_lines;
+
 const ESCAPE_CHAR: char = '\\';
 const MAX_LINK_NESTED_DEPTH: usize = 10;
 

crates/mdbook-driver/src/builtin_preprocessors/links/take_lines.rs

@@ -1,9 +1,9 @@
-use crate::static_regex;
+use mdbook_core::static_regex;
 use std::ops::Bound::{Excluded, Included, Unbounded};
 use std::ops::RangeBounds;
 
 /// Take a range of lines from a string.
-pub fn take_lines<R: RangeBounds<usize>>(s: &str, range: R) -> String {
+pub(super) fn take_lines<R: RangeBounds<usize>>(s: &str, range: R) -> String {
     let start = match range.start_bound() {
         Excluded(&n) => n + 1,
         Included(&n) => n,
@@ -28,7 +28,7 @@ static_regex!(ANCHOR_END, r"ANCHOR_END:\s*(?P<anchor_name>[\w_-]+)");
 
 /// Take anchored lines from a string.
 /// Lines containing anchor are ignored.
-pub fn take_anchored_lines(s: &str, anchor: &str) -> String {
+pub(super) fn take_anchored_lines(s: &str, anchor: &str) -> String {
     let mut retained = Vec::<&str>::new();
     let mut anchor_found = false;
 
@@ -60,7 +60,7 @@ pub fn take_anchored_lines(s: &str, anchor: &str) -> String {
 /// For any lines not in the range, include them but use `#` at the beginning. This will hide the
 /// lines from initial display but include them when expanding the code snippet or testing with
 /// rustdoc.
-pub fn take_rustdoc_include_lines<R: RangeBounds<usize>>(s: &str, range: R) -> String {
+pub(super) fn take_rustdoc_include_lines<R: RangeBounds<usize>>(s: &str, range: R) -> String {
     let mut output = String::with_capacity(s.len());
 
     for (index, line) in s.lines().enumerate() {
@@ -78,7 +78,7 @@ pub fn take_rustdoc_include_lines<R: RangeBounds<usize>>(s: &str, range: R) -> S
 /// For any lines not between the anchors, include them but use `#` at the beginning. This will
 /// hide the lines from initial display but include them when expanding the code snippet or testing
 /// with rustdoc.
-pub fn take_rustdoc_include_anchored_lines(s: &str, anchor: &str) -> String {
+pub(super) fn take_rustdoc_include_anchored_lines(s: &str, anchor: &str) -> String {
     let mut output = String::with_capacity(s.len());
     let mut within_anchored_section = false;