diff --git a/parser/src/char_traits.rs b/parser/src/char_traits.rs
index 4a08da1..2cb5d8d 100644
--- a/parser/src/char_traits.rs
+++ b/parser/src/char_traits.rs
@@ -2,25 +2,29 @@
 
 /// Check whether the character is nil (`\0`).
 #[inline]
-pub(crate) fn is_z(c: char) -> bool {
+#[must_use]
+pub fn is_z(c: char) -> bool {
     c == '\0'
 }
 
 /// Check whether the character is a line break (`\r` or `\n`).
 #[inline]
-pub(crate) fn is_break(c: char) -> bool {
+#[must_use]
+pub fn is_break(c: char) -> bool {
     c == '\n' || c == '\r'
 }
 
 /// Check whether the character is nil or a line break (`\0`, `\r`, `\n`).
 #[inline]
-pub(crate) fn is_breakz(c: char) -> bool {
+#[must_use]
+pub fn is_breakz(c: char) -> bool {
     is_break(c) || is_z(c)
 }
 
 /// Check whether the character is a whitespace (` ` or `\t`).
 #[inline]
-pub(crate) fn is_blank(c: char) -> bool {
+#[must_use]
+pub fn is_blank(c: char) -> bool {
     c == ' ' || c == '\t'
 }
 
@@ -28,31 +32,36 @@ pub(crate) fn is_blank(c: char) -> bool {
 ///
 /// `\0`, ` `, `\t`, `\n`, `\r`
 #[inline]
-pub(crate) fn is_blank_or_breakz(c: char) -> bool {
+#[must_use]
+pub fn is_blank_or_breakz(c: char) -> bool {
     is_blank(c) || is_breakz(c)
 }
 
 /// Check whether the character is an ascii digit.
 #[inline]
-pub(crate) fn is_digit(c: char) -> bool {
+#[must_use]
+pub fn is_digit(c: char) -> bool {
     c.is_ascii_digit()
 }
 
 /// Check whether the character is a digit, letter, `_` or `-`.
 #[inline]
-pub(crate) fn is_alpha(c: char) -> bool {
+#[must_use]
+pub fn is_alpha(c: char) -> bool {
     matches!(c, '0'..='9' | 'a'..='z' | 'A'..='Z' | '_' | '-')
 }
 
 /// Check whether the character is a hexadecimal character (case insensitive).
 #[inline]
-pub(crate) fn is_hex(c: char) -> bool {
+#[must_use]
+pub fn is_hex(c: char) -> bool {
     c.is_ascii_digit() || ('a'..='f').contains(&c) || ('A'..='F').contains(&c)
 }
 
 /// Convert the hexadecimal digit to an integer.
 #[inline]
-pub(crate) fn as_hex(c: char) -> u32 {
+#[must_use]
+pub fn as_hex(c: char) -> u32 {
     match c {
         '0'..='9' => (c as u32) - ('0' as u32),
         'a'..='f' => (c as u32) - ('a' as u32) + 10,
@@ -63,49 +72,57 @@ pub(crate) fn as_hex(c: char) -> u32 {
 
 /// Check whether the character is a YAML flow character (one of `,[]{}`).
 #[inline]
-pub(crate) fn is_flow(c: char) -> bool {
+#[must_use]
+pub fn is_flow(c: char) -> bool {
     matches!(c, ',' | '[' | ']' | '{' | '}')
 }
 
 /// Check whether the character is the BOM character.
 #[inline]
-pub(crate) fn is_bom(c: char) -> bool {
+#[must_use]
+pub fn is_bom(c: char) -> bool {
     c == '\u{FEFF}'
 }
 
 /// Check whether the character is a YAML non-breaking character.
 #[inline]
-pub(crate) fn is_yaml_non_break(c: char) -> bool {
+#[must_use]
+pub fn is_yaml_non_break(c: char) -> bool {
     // TODO(ethiraric, 28/12/2023): is_printable
     !is_break(c) && !is_bom(c)
 }
 
 /// Check whether the character is NOT a YAML whitespace (` ` / `\t`).
 #[inline]
-pub(crate) fn is_yaml_non_space(c: char) -> bool {
+#[must_use]
+pub fn is_yaml_non_space(c: char) -> bool {
     is_yaml_non_break(c) && !is_blank(c)
 }
 
 /// Check whether the character is a valid YAML anchor name character.
 #[inline]
-pub(crate) fn is_anchor_char(c: char) -> bool {
+#[must_use]
+pub fn is_anchor_char(c: char) -> bool {
     is_yaml_non_space(c) && !is_flow(c) && !is_z(c)
 }
 
 /// Check whether the character is a valid word character.
 #[inline]
-pub(crate) fn is_word_char(c: char) -> bool {
+#[must_use]
+pub fn is_word_char(c: char) -> bool {
     is_alpha(c) && c != '_'
 }
 
 /// Check whether the character is a valid URI character.
 #[inline]
-pub(crate) fn is_uri_char(c: char) -> bool {
+#[must_use]
+pub fn is_uri_char(c: char) -> bool {
     is_word_char(c) || "#;/?:@&=+$,_.!~*\'()[]%".contains(c)
 }
 
 /// Check whether the character is a valid tag character.
 #[inline]
-pub(crate) fn is_tag_char(c: char) -> bool {
+#[must_use]
+pub fn is_tag_char(c: char) -> bool {
     is_uri_char(c) && !is_flow(c) && c != '!'
 }
diff --git a/parser/src/input.rs b/parser/src/input.rs
index 13c309c..d2b3e7c 100644
--- a/parser/src/input.rs
+++ b/parser/src/input.rs
@@ -1,10 +1,15 @@
-pub mod buffered;
-pub mod str;
+//! Utilities to create a source of input to the parser.
+//!
+//! [`Input`] must be implemented for the parser to fetch input. Make sure your needs aren't
+//! covered by the [`BufferedInput`].
+
+pub(crate) mod buffered;
+pub(crate) mod str;
 
 #[allow(clippy::module_name_repetitions)]
 pub use buffered::BufferedInput;
 
-use crate::char_traits::{
+pub use crate::char_traits::{
     is_alpha, is_blank, is_blank_or_breakz, is_break, is_breakz, is_digit, is_flow, is_z,
 };
 
@@ -440,6 +445,7 @@ impl SkipTabs {
     /// Whether tabs were found while skipping whitespace.
     ///
     /// This function must be called after a call to `skip_ws_to_eol`.
+    #[must_use]
     pub fn found_tabs(self) -> bool {
         matches!(self, SkipTabs::Result(true, _))
     }
@@ -447,6 +453,7 @@ impl SkipTabs {
     /// Whether a valid YAML whitespace has been found in skipped-over content.
     ///
     /// This function must be called after a call to `skip_ws_to_eol`.
+    #[must_use]
     pub fn has_valid_yaml_ws(self) -> bool {
         matches!(self, SkipTabs::Result(_, true))
     }
diff --git a/parser/src/lib.rs b/parser/src/lib.rs
index ae81d45..6ad94d1 100644
--- a/parser/src/lib.rs
+++ b/parser/src/lib.rs
@@ -35,7 +35,7 @@
 mod char_traits;
 #[macro_use]
 mod debug;
-mod input;
+pub mod input;
 mod parser;
 mod scanner;