### Test Utilities for Ordering

Source: https://docs.rs/gdstyle/0.2.5/src/gdstyle/rules/ordering.rs.html

Helper functions and setup for unit testing the ordering logic.

```rust
fn span(line: usize) -> Span {
    Span::new(line, 1, 0, 0)
}
```

--------------------------------

### Config::find_and_load

Source: https://docs.rs/gdstyle/0.2.5/gdstyle/config/struct.Config.html

Searches for a configuration file starting from a given directory and walking up the directory tree.

```APIDOC
## pub fn find_and_load(start_dir: &Path) -> Self

### Description
Searches for a configuration file by walking up the directory tree starting from the specified directory.

### Parameters
- **start_dir** (&Path) - Required - The directory to begin the search from.

### Returns
- **Self** - Returns the loaded Config instance.
```

--------------------------------

### Compute attached starts

Source: https://docs.rs/gdstyle/0.2.5/src/gdstyle/formatter.rs.html

Walks backward from declaration lines to identify comments and annotations that should move with the member.

```rust
/// For each anchor, walk backward from its declaration line to find attached
/// comments / annotations: those belong to the member and move with it.
fn compute_attached_starts(merged: &[Anchor], lines: &[&str]) -> Vec<usize> {
    let mut attached_starts: Vec<usize> = Vec::new();
    for (i, &(decl_line, _, _)) in merged.iter().enumerate() {
        let prev_boundary = if i > 0 { merged[i - 1].0 + 1 } else { 0 };
        let mut start = decl_line;
        let mut j = decl_line;
        while j > prev_boundary {
            j -= 1;
            let content = if j < lines.len() { lines[j].trim() } else { "" };
            if content.starts_with('#') || content.starts_with('@') {
                start = j;
            } else if content.is_empty() {
                // Blank line: keep looking only if a comment sits directly above.
                let above = if j > prev_boundary && j - 1 < lines.len() {
                    lines[j - 1].trim()
                } else {
                    ""
                };
                if !above.starts_with('#') && !above.starts_with('@') {
                    break;
                }
            } else {
                break;
            }
        }
        attached_starts.push(start);
    }
    attached_starts
}
```

--------------------------------

### pub fn line_byte_offset(lines: &[String], line_idx: usize) -> usize

Source: https://docs.rs/gdstyle/0.2.5/gdstyle/diagnostic/fn.line_byte_offset.html

Computes the byte offset of the start of a given line (0-indexed line_idx).

```APIDOC
## Function: line_byte_offset

### Description
Compute the byte offset of the start of a given line (0-indexed line_idx).

### Signature
`pub fn line_byte_offset(lines: &[String], line_idx: usize) -> usize`

### Parameters
- **lines** (&[String]) - A slice of strings representing the lines of text.
- **line_idx** (usize) - The 0-indexed line number to calculate the offset for.

### Returns
- **usize** - The byte offset of the start of the specified line.
```

--------------------------------

### Check Operand Start Boundary

Source: https://docs.rs/gdstyle/0.2.5/src/gdstyle/rules/quality.rs.html

Determines if a token marks a clean boundary for the start of an operand, preventing partial matches within larger expressions.

```rust
fn is_operand_start_boundary(token: Option<&Token>) -> bool {
    match token {
        None => true,
        Some(t) => matches!(
            t.kind,
            TokenKind::Newline
                | TokenKind::Semicolon
                | TokenKind::Colon
                | TokenKind::Comma
                | TokenKind::LeftParen
                | TokenKind::LeftBracket
                | TokenKind::LeftBrace
                | TokenKind::If
                | TokenKind::Elif
                | TokenKind::While
                | TokenKind::When
                | TokenKind::Return
                | TokenKind::Assert
        )
    }
}
```

--------------------------------

### Config::from_file

Source: https://docs.rs/gdstyle/0.2.5/gdstyle/config/struct.Config.html

Loads configuration settings from a specified TOML file path.

```APIDOC
## pub fn from_file(path: &Path) -> Result<Self, ConfigError>

### Description
Loads configuration from a TOML file located at the provided path.

### Parameters
- **path** (&Path) - Required - The filesystem path to the TOML configuration file.

### Returns
- **Result<Self, ConfigError>** - Returns the loaded Config instance or a ConfigError if the file cannot be read or parsed.
```

--------------------------------

### Read Annotation Token

Source: https://docs.rs/gdstyle/0.2.5/src/gdstyle/lexer.rs.html

Extracts annotation names starting with the @ symbol.

```rust
    fn read_annotation(&mut self) -> Token {
        let start_offset = self.byte_offset;
        let start_col = self.column;

        self.advance(); // skip @

        let mut name = String::new();
        while !self.is_at_end()
            && (self.current_char().is_ascii_alphanumeric() || self.current_char() == '_')
        {
            name.push(self.current_char());
            self.advance();
        }

        let text = format!("@{}", name);
        let span = Span::new(self.line, start_col, start_offset, text.len());
        Token::new(TokenKind::Annotation(name), span, text)
    }
```

--------------------------------

### Load Configuration from Files

Source: https://docs.rs/gdstyle/0.2.5/src/gdstyle/config.rs.html

Methods to load configuration from a specific file or by searching parent directories for a configuration file.

```rust
impl Config {
    /// Load configuration from a TOML file.
    pub fn from_file(path: &Path) -> Result<Self, ConfigError> {
        let content = std::fs::read_to_string(path)
            .map_err(|e| ConfigError::ReadError(path.display().to_string(), e.to_string()))?;
        let config: Config = toml::from_str(&content)
            .map_err(|e| ConfigError::ParseError(path.display().to_string(), e.to_string()))?;
        Ok(config)
    }

    /// Search for a config file starting from the given directory, walking up.
    pub fn find_and_load(start_dir: &Path) -> Self {
        let config_names = ["gdstyle.toml", ".gdstyle.toml"];
        let mut dir = start_dir.to_path_buf();

        loop {
            for name in &config_names {
                let path = dir.join(name);
                if path.exists() {
                    match Self::from_file(&path) {
                        Ok(config) => return config,
                        Err(e) => {
                            eprintln!("warning: failed to load {}: {}", path.display(), e);
                        }
                    }
                }
            }

            if !dir.pop() {
                break;
            }
        }

        Self::default()
    }

    /// Rules that are off by default and must be explicitly enabled.
    const OFF_BY_DEFAULT: &[&str] = &[
        "quality/type-hint",
        "quality/empty-function",
        "quality/no-debug-print",
    ];

    /// Check if a rule is enabled with the given default severity.
    pub fn is_rule_enabled(&self, rule_name: &str) -> bool {
        match self.rules.get(rule_name) {
            Some(RuleSeverityConfig::Off) => false,
            Some(_) => true,
            None => !Self::OFF_BY_DEFAULT.contains(&rule_name),
        }
    }
}
```

--------------------------------

### Get Next Significant Token

Source: https://docs.rs/gdstyle/0.2.5/src/gdstyle/fixer.rs.html

Finds the next token in the stream that is not trivia.

```rust
fn next_significant(tokens: &[Token], idx: usize) -> Option<&Token> {
    tokens
        .iter()
        .skip(idx + 1)
        .find(|tok| !is_trivia(&tok.kind))
}
```

--------------------------------

### Operator Identification

Source: https://docs.rs/gdstyle/0.2.5/src/gdstyle/lexer.rs.html

Determines if a character marks the start of a known GDScript operator or delimiter.

```rust
fn is_known_operator_start(ch: char) -> bool {
    matches!(
        ch,
        '-' | ','
            | ';'
            | ':'
            | '!'
            | '.'
            | '('
            | ')'
            | '['
            | ']'
            | '{'
            | '}'
            | '*'
            | '/'
            | '&'
            | '%'
            | '^'
            | '+'
            | '<'
            | '='
            | '>'
            | '|'
            | '~'
    )
}
```

--------------------------------

### Collect GDScript files with a filter

Source: https://docs.rs/gdstyle/0.2.5/gdstyle/collect/fn.collect_gdscript_files.html

Demonstrates how to initialize a PathFilter and use it to collect .gd files from a project directory.

```rust
use gdstyle::collect::{collect_gdscript_files, PathFilter};
use std::path::PathBuf;

let filter = PathFilter::new(&["addons".into()], &["addons/my_plugin".into()]);
let files = collect_gdscript_files(&[PathBuf::from("res-project")], &filter);
```

--------------------------------

### Validate private member naming

Source: https://docs.rs/gdstyle/0.2.5/src/gdstyle/rules/naming.rs.html

Checks that members starting with an underscore do not have export annotations.

```rust
pub fn check_private_underscore_prefix(file: &ScriptFile, diagnostics: &mut Vec<Diagnostic>) {
    // This rule checks that functions/vars starting with _ don't have @export.
    // It's more of a convention check.
    for member in &file.members {
        if let ClassMember::Variable {
            name,
            annotations,
            span,
            ..
        } = member
        {
            if name.starts_with('_')
                && annotations
                    .iter()
```

--------------------------------

### Test Utilities

Source: https://docs.rs/gdstyle/0.2.5/src/gdstyle/rules/formatting.rs.html

Helper functions for creating mock files and tokenizing source strings during unit testing.

```rust
fn make_file(lines: &[&str]) -> ScriptFile {
    ScriptFile {
        path: "test.gd".to_string(),
        members: vec![],
        lines: lines.iter().map(|s| s.to_string()).collect(),
    }
}

fn tokenize(source: &str) -> Vec<Token> {
    let mut lexer = crate::lexer::Lexer::new(source);
    lexer.tokenize()
}
```

--------------------------------

### Quality Rule Test Utilities

Source: https://docs.rs/gdstyle/0.2.5/src/gdstyle/rules/quality.rs.html

Helper functions for setting up test environments, including span generation and source lexing.

```rust
    fn span(line: usize) -> Span {
        Span::new(line, 1, 0, 0)
    }

    /// Lex a source snippet into the token stream the rules operate on.
    /// Keeps dotted-path regression tests readable instead of hand-building
    /// `Identifier`/`Dot` sequences.
    fn lex(source: &str) -> Vec<Token> {
        crate::lexer::Lexer::new(source).tokenize()
    }

    fn empty_file() -> ScriptFile {
        ScriptFile {
            path: "test.gd".to_string(),
            lines: vec![],
            members: vec![],
        }
    }
```

--------------------------------

### Token Stream Navigation Utilities

Source: https://docs.rs/gdstyle/0.2.5/src/gdstyle/parser.rs.html

Helper methods for skipping whitespace, comments, and expressions, as well as basic token stream navigation.

```rust
    fn skip_newlines(&mut self) {
        while !self.is_at_end() && self.current_kind() == TokenKind::Newline {
            self.advance();
        }
    }

    fn skip_newlines_and_comments(&mut self) {
        while !self.is_at_end() {
            match self.current_kind() {
                TokenKind::Newline => self.advance(),
                TokenKind::Comment(_) | TokenKind::DocComment(_) => self.advance(),
                _ => break,
            }
        }
    }

    fn skip_to_newline(&mut self) {
        while !self.is_at_end()
            && self.current_kind() != TokenKind::Newline
            && self.current_kind() != TokenKind::Eof
        {
            self.advance();
        }
    }

    fn skip_expression(&mut self) {
        let mut paren_depth = 0;
        while !self.is_at_end() {
            match self.current_kind() {
                TokenKind::LeftParen | TokenKind::LeftBracket | TokenKind::LeftBrace => {
                    paren_depth += 1;
                    self.advance();
                }
                TokenKind::RightParen | TokenKind::RightBracket | TokenKind::RightBrace => {
                    if paren_depth == 0 {
                        break;
                    }
                    paren_depth -= 1;
                    self.advance();
                }
                TokenKind::Comma if paren_depth == 0 => break,
                TokenKind::Newline if paren_depth == 0 => break,
                _ => {
                    self.advance();
                }
            }
        }
    }

    fn current_token(&self) -> &Token {
        &self.tokens[self.position]
    }

    fn current_kind(&self) -> TokenKind {
        self.tokens[self.position].kind.clone()
    }

    fn advance(&mut self) {
        if self.position < self.tokens.len() - 1 {
            self.position += 1;
        }
    }

    fn is_at_end(&self) -> bool {
        self.position >= self.tokens.len() || self.tokens[self.position].kind == TokenKind::Eof
    }
}
```

--------------------------------

### run_all_rules_with_source

Source: https://docs.rs/gdstyle/0.2.5/gdstyle/rules/fn.run_all_rules_with_source.html

Executes all enabled lint rules, optionally incorporating source code for token-gap analysis.

```APIDOC
## Function: run_all_rules_with_source

### Description
Runs all enabled lint rules on the provided script file. It supports optional source input for performing token-gap analysis.

### Signature
`pub fn run_all_rules_with_source(file: &ScriptFile, tokens: &[Token], config: &Config, source: Option<&str>) -> Vec<Diagnostic>`

### Parameters
- **file** (&ScriptFile) - The script file to be analyzed.
- **tokens** (&[Token]) - A slice of tokens extracted from the script.
- **config** (&Config) - The configuration settings for the lint rules.
- **source** (Option<&str>) - Optional source code string used for token-gap analysis.

### Returns
- **Vec<Diagnostic>** - A collection of diagnostic results generated by the lint rules.
```

--------------------------------

### Parse Hexadecimal Numbers

Source: https://docs.rs/gdstyle/0.2.5/src/gdstyle/lexer.rs.html

Parses hexadecimal numeric literals starting with a prefix, stripping underscores before conversion.

```rust
    fn read_hex_number(
        &mut self,
        start_offset: usize,
        start_col: usize,
        mut text: String,
    ) -> Token {
        while !self.is_at_end()
            && (self.current_char().is_ascii_hexdigit() || self.current_char() == '_')
        {
            text.push(self.current_char());
            self.advance();
        }

        let span = Span::new(self.line, start_col, start_offset, text.len());
        let hex_str = text[2..].replace('_', "");
        match i64::from_str_radix(&hex_str, 16) {
            Ok(val) => Token::new(TokenKind::Integer(val), span, text),
            Err(_) => Token::new(
                TokenKind::Error(format!("invalid hex: {}", text)),
                span,
                text,
            ),
        }
    }
```

--------------------------------

### Lexer::new

Source: https://docs.rs/gdstyle/0.2.5/gdstyle/lexer/struct.Lexer.html

Creates a new instance of the Lexer with the provided source code.

```APIDOC
## pub fn new(source: &'a str) -> Self

### Description
Creates a new Lexer instance to process the given GDScript source string.

### Parameters
- **source** (&'a str) - Required - The GDScript source code to be tokenized.
```

--------------------------------

### Get Leading Annotation Line

Source: https://docs.rs/gdstyle/0.2.5/src/gdstyle/formatter.rs.html

Finds the earliest line number occupied by any annotation attached to a class member.

```rust
fn leading_annotation_line(member: &ClassMember) -> Option<usize> {
    let annotations = match member {
        ClassMember::Variable { annotations, .. }
        | ClassMember::Function { annotations, .. }
        | ClassMember::StaticVariable { annotations, .. } => annotations.as_slice(),
        _ => return None,
    };
    annotations.iter().map(|a| a.span.line).min()
}
```

--------------------------------

### Enforce Comment Spacing

Source: https://docs.rs/gdstyle/0.2.5/src/gdstyle/rules/formatting.rs.html

Ensures that comments start with a space after the '#' character, while ignoring doc comments and specific region markers.

```rust
pub fn check_comment_spacing(
    tokens: &[Token],
    file: &ScriptFile,
    diagnostics: &mut Vec<Diagnostic>,
) {
    for token in tokens {
        match &token.kind {
            TokenKind::Comment(content) => {
                if !content.is_empty()
                    && !content.starts_with(' ')
                    && !content.starts_with('!')
                    && !content.starts_with("region")
                    && !content.starts_with("endregion")
                {
                    let first_char = content.chars().next().unwrap();
                    if first_char.is_ascii_alphabetic() || first_char == '_' || first_char == '\t' {
                        continue;
                    }
                    // Insert a space after the '#'.
                    let insert_offset = token.span.offset + 1; // after '#'
                    diagnostics.push(
                        Diagnostic::warning(
                            "format/comment-spacing",
                            "add a space after '#' in comments".to_string(),
                            token.span,
                            &file.path,
                        )
                        .with_fix(Fix {
                            replacements: vec![Replacement {
                                offset: insert_offset,
                                length: 0,
                                new_text: " ".to_string(),
                            }],
                            is_safe: true,
                        }),
                    );
                }
            }
            TokenKind::DocComment(_) => {
                // Don't touch ## doc comments. ## is meaningful in GDScript, and
                // codebases sometimes use ## as a "double-comment-out" of code
                // (e.g. `##var foo`) where a blanket "add a space after ##" rewrite
                // changes how a reader interprets the line.
            }
            _ => {}
        }
    }
}
```

--------------------------------

### pub fn run_all_rules

Source: https://docs.rs/gdstyle/0.2.5/gdstyle/rules/fn.run_all_rules.html

Executes all enabled lint rules on a parsed script file.

```APIDOC
## run_all_rules

### Description
Runs all enabled lint rules on a parsed script file.

### Signature
`pub fn run_all_rules(file: &ScriptFile, tokens: &[Token], config: &Config) -> Vec<Diagnostic>`

### Parameters
- **file** (&ScriptFile) - The parsed script file to analyze.
- **tokens** (&[Token]) - The slice of tokens associated with the script.
- **config** (&Config) - The configuration settings for the lint rules.

### Returns
- **Vec<Diagnostic>** - A vector containing the diagnostics generated by the lint rules.
```

--------------------------------

### Normalize Member Spacing

Source: https://docs.rs/gdstyle/0.2.5/src/gdstyle/formatter.rs.html

Rewrites source code to match canonical Godot style guide spacing between top-level class members.

```rust
fn normalize_member_spacing(source: &str) -> String {
    let mut lexer = Lexer::new(source);
    let tokens = lexer.tokenize();
    let members = Parser::new(&tokens).parse();
    if members.is_empty() {
        return source.to_string();
    }

    let lines: Vec<&str> = source.split('\n').collect();

    // Walk parsed members and group adjacent `##` doc-comment lines with the
    // next non-doc declaration (the doc "attaches" to it). A blank line
    // between two doc blocks splits them: the older block becomes a
    // standalone class-level doc unit, the newer block is still pending.
    let mut units: Vec<MemberUnit> = Vec::new();
    let mut pending_doc_start: Option<usize> = None;
    let mut pending_doc_last: Option<usize> = None;
    // A contiguous block of plain `#` comments awaiting the next declaration.
    // Unlike doc comments it never becomes its own unit; it only ever gets
    // absorbed as a leading comment when it sits tight against a declaration.
    let mut pending_comment_start: Option<usize> = None;
    let mut pending_comment_last: Option<usize> = None;

    let flush_standalone_docs =
        |units: &mut Vec<MemberUnit>, start: &mut Option<usize>, last: &mut Option<usize>| {
            if let (Some(s), Some(_)) = (*start, *last) {
                units.push(MemberUnit {
                    category: 3,
                    start: s,
                    decl_start: s,
                });
            }
            *start = None;
            *last = None;
        };

    for member in &members {
        match member {
```

--------------------------------

### Test Configuration Defaults

Source: https://docs.rs/gdstyle/0.2.5/src/gdstyle/config.rs.html

Verifies that the default configuration is initialized with expected values.

```rust
#[test]
    fn default_config() {
        let config = Config::default();
        assert_eq!(config.max_line_length, 100);
        assert!(config.use_tabs);
        assert_eq!(config.max_function_length, 50);
        assert!(config.exclude.contains(&".godot".to_string()));
        assert!(config.exclude.contains(&"addons".to_string()));
        assert!(config.include.is_empty());
    }
```

--------------------------------

### Parse RHS Identifier Chains

Source: https://docs.rs/gdstyle/0.2.5/src/gdstyle/rules/quality.rs.html

Extracts a sequence of identifiers starting from a given token index, supporting keywords like self and super.

```rust
fn rhs_chain_starting_at(tokens: &[Token], start: usize) -> (Vec<String>, usize) {
    let mut chain: Vec<String> = Vec::new();
    let mut i = start;
    // First segment can be a keyword (`self`/`super`) or an identifier.
    match tokens.get(i).map(|t| &t.kind) {
        Some(TokenKind::Identifier(name)) => {
            chain.push(name.clone());
        }
        Some(TokenKind::Self_) => {
            chain.push("self".to_string());
        }
        Some(TokenKind::Super) => {
            chain.push("super".to_string());
        }
        _ => return (chain, i),
    }
    // Subsequent segments must be `.identifier`.
    while i + 2 < tokens.len()
        && tokens[i + 1].kind == TokenKind::Dot
        && matches!(tokens[i + 2].kind, TokenKind::Identifier(_))
    {
        if let TokenKind::Identifier(name) = &tokens[i + 2].kind {
            chain.push(name.clone());
        }
        i += 2;
    }
    (chain, i + 1)
}
```

--------------------------------

### Function signature for run_all_rules_with_source

Source: https://docs.rs/gdstyle/0.2.5/gdstyle/rules/fn.run_all_rules_with_source.html

The function signature defines the required parameters including the script file, tokens, configuration, and optional source string.

```rust
pub fn run_all_rules_with_source(
    file: &ScriptFile,
    tokens: &[Token],
    config: &Config,
    source: Option<&str>,
) -> Vec<Diagnostic>
```

--------------------------------

### Implement Default Configuration

Source: https://docs.rs/gdstyle/0.2.5/src/gdstyle/config.rs.html

Provides default values for all configuration fields, including standard exclusions.

```rust
impl Default for Config {
    fn default() -> Self {
        Self {
            max_line_length: 100,
            use_tabs: true,
            max_function_length: 50,
            max_file_length: 1000,
            max_parameters: 5,
            max_returns: 6,
            max_nesting_depth: 4,
            max_local_variables: 10,
            max_branches: 8,
            max_class_variables: 15,
            max_public_methods: 20,
            max_inner_classes: 5,
            exclude: vec![".godot".to_string(), "addons".to_string()],
            include: Vec::new(),
            rules: HashMap::new(),
        }
    }
}
```

--------------------------------

### Format a file on disk

Source: https://docs.rs/gdstyle/0.2.5/src/gdstyle/formatter.rs.html

Reads a file from the provided path, formats its content, and writes it back if changes were detected.

```rust
pub fn format_file(path: &std::path::Path, config: &Config) -> Result<bool, String> {
    let source = std::fs::read_to_string(path)
        .map_err(|e| format!("cannot read {}: {}", path.display(), e))?;
    let formatted = format_source(&source, config);
    if formatted == source {
        return Ok(false);
    }
    std::fs::write(path, &formatted)
        .map_err(|e| format!("cannot write {}: {}", path.display(), e))?;
    Ok(true)
}
```

--------------------------------

### Normalize Float Literals

Source: https://docs.rs/gdstyle/0.2.5/src/gdstyle/formatter.rs.html

Standardizes float literals by adding a leading zero to values starting with a dot or a trailing zero to values ending with a dot.

```rust
fn normalize_float_literals(source: &str) -> String {
    let mut lexer = crate::lexer::Lexer::new(source);
    let tokens = lexer.tokenize();
    let mut replacements: Vec<(usize, usize, String)> = Vec::new();

    for token in &tokens {
        if let crate::token::TokenKind::Float(_) = &token.kind {
            let text = &token.text;
            if text.starts_with('.') {
                replacements.push((token.span.offset, token.span.length, format!("0{}", text)));
            } else if text.ends_with('.') {
                replacements.push((token.span.offset, token.span.length, format!("{}0", text)));
            }
        }
    }

    if replacements.is_empty() {
        return source.to_string();
    }

    let mut result = source.to_string();
    for (offset, length, new_text) in replacements.into_iter().rev() {
        let end = (offset + length).min(result.len());
        result.replace_range(offset..end, &new_text);
    }
    result
}
```

--------------------------------

### Parser::new

Source: https://docs.rs/gdstyle/0.2.5/gdstyle/parser/struct.Parser.html

Creates a new Parser instance from a slice of tokens.

```APIDOC
## pub fn new(tokens: &'t [Token]) -> Self

### Description
Creates a new Parser instance that borrows the provided slice of tokens. The parser does not clone the token buffer, allowing for efficient memory usage.

### Parameters
- **tokens** (&'t [Token]) - Required - A reference to a slice of tokens to be parsed.
```

--------------------------------

### Validate GDScript Class Member Order

Source: https://docs.rs/gdstyle/0.2.5/src/gdstyle/rules/ordering.rs.html

The primary entry point for checking if class members follow the canonical order defined in the GDScript style guide.

```rust
pub fn check_class_member_order(file: &ScriptFile, diagnostics: &mut Vec<Diagnostic>) {
    // Members carrying a `# gdstyle:ignore=order/class-member-order` directive
    // opt out of the ordering check. They are skipped entirely — neither
    // flagged nor counted towards the running "highest category seen" — so a
    // pinned member (e.g. a const kept next to the enum it mirrors) does not
    // make its neighbours look out of order. This mirrors how the formatter's
    // reorder pass pins the same members in place.
    let suppressions = Suppressions::parse(&file.lines.join("\n"));
    check_member_order_recursive(&file.members, &file.path, &suppressions, diagnostics);
}
```

--------------------------------

### fn all_rules

Source: https://docs.rs/gdstyle/0.2.5/gdstyle/rules/fn.all_rules.html

Retrieves a static slice of tuples containing all available lint rule names and their corresponding human-readable descriptions.

```APIDOC
## fn all_rules

### Description
Returns a list of all available rule names. Every lint rule is paired with a one-line human description. This function acts as the single source of truth for rule definitions.

### Signature
`pub fn all_rules() -> &'static [(&'static str, &'static str)]`

### Returns
- **&'static [(&'static str, &'static str)]**: A static slice of tuples where the first element is the rule name and the second element is the rule description.
```

--------------------------------

### Lexer implementation methods

Source: https://docs.rs/gdstyle/0.2.5/gdstyle/lexer/struct.Lexer.html

Methods available on the Lexer struct for creating a new instance and tokenizing source code.

```rust
pub fn new(source: &'a str) -> Self
```

```rust
pub fn tokenize(&mut self) -> Vec<Token>
```

--------------------------------

### Retrieve all rule names

Source: https://docs.rs/gdstyle/0.2.5/src/gdstyle/rules/mod.rs.html

Returns a vector containing the names of all defined quality rules.

```rust
pub fn all_rule_names() -> Vec<&'static str> {
    all_rules().iter().map(|(name, _)| *name).collect()
}
```

--------------------------------

### Function Signature for lint_source

Source: https://docs.rs/gdstyle/0.2.5/gdstyle/linter/fn.lint_source.html

The signature defines the required parameters: the source string, the file path, and the configuration object.

```rust
pub fn lint_source(
    source: &str,
    file_path: &str,
    config: &Config,
) -> Vec<Diagnostic>
```

--------------------------------

### pub fn lint_file(path: &Path, config: &Config) -> Result<Vec<Diagnostic>, String>

Source: https://docs.rs/gdstyle/0.2.5/gdstyle/linter/fn.lint_file.html

Lint a file from disk using the provided path and configuration.

```APIDOC
## lint_file

### Description
Lint a file from disk.

### Signature
`pub fn lint_file(path: &Path, config: &Config) -> Result<Vec<Diagnostic>, String>`

### Parameters
- **path** (&Path) - The path to the file to be linted.
- **config** (&Config) - The configuration settings for the linter.

### Returns
- **Result<Vec<Diagnostic>, String>** - Returns a vector of diagnostics if successful, or an error string if the operation fails.
```

--------------------------------

### Diagnostic Reporting Implementation

Source: https://docs.rs/gdstyle/0.2.5/src/gdstyle/reporter.rs.html

Contains the core logic for formatting diagnostics as text, JSON, or summary reports.

```rust
1use crate::diagnostic::{Diagnostic, Severity};
2use colored::Colorize;
3
4/// Output format for lint results.
5#[derive(Debug, Clone, Copy, PartialEq, Eq)]
6pub enum OutputFormat {
7    Text,
8    Json,
9}
10
11/// Format diagnostics for human-readable terminal output.
12///
13/// Each diagnostic prints `line:col severity message [rule]` followed by the
14/// offending source line and a caret underline (like rustc / ruff), so the
15/// reader doesn't have to jump back to an editor. The source line is read
16/// lazily from disk per file; if the file can't be read (e.g. linting an
17/// in-memory string) the caret is simply omitted.
18pub fn format_text(diagnostics: &[Diagnostic]) -> String {
19    let mut output = String::new();
20    let mut current_file = String::new();
21    let mut current_lines: Vec<String> = Vec::new();
22
23    for diag in diagnostics {
24        if diag.file != current_file {
25            if !current_file.is_empty() {
26                output.push('\n');
27            }
28            current_file = diag.file.clone();
29            output.push_str(&current_file.bold().to_string());
30            output.push('\n');
31            current_lines = std::fs::read_to_string(&current_file)
32                .map(|s| s.lines().map(str::to_string).collect())
33                .unwrap_or_default();
34        }
35
36        let severity_str = match diag.severity {
37            Severity::Warning => "warning".yellow().to_string(),
38            Severity::Error => "error".red().to_string(),
39        };
40
41        let location = format!("  {}:{}", diag.span.line, diag.span.column)
42            .dimmed()
43            .to_string();
44        let rule = format!("[{}]", diag.rule).dimmed().to_string();
45
46        output.push_str(&format!(
47            "{} {} {} {}\n",
48            location, severity_str, diag.message, rule
49        ));
50
51        // Source line + caret underline, when we have the source and a
52        // real (1-based) column.
53        if let Some(src_line) = current_lines.get(diag.span.line.wrapping_sub(1)) {
54            if diag.span.column >= 1 {
55                output.push_str(&format!("      {}\n", src_line.dimmed()));
56                let caret_pad = caret_padding(src_line, diag.span.column - 1);
57                output.push_str(&format!("      {}{}\n", caret_pad, "^".cyan()));
58            }
59        }
60    }
61
62    output
63}
64
65/// Build the indentation that places a caret under column `col` (0-based) of
66/// `line`, preserving tabs so the caret lines up in a tab-rendering terminal.
67fn caret_padding(line: &str, col: usize) -> String {
68    line.chars()
69        .take(col)
70        .map(|c| if c == '\t' { '\t' } else { ' ' })
71        .collect()
72}
73
74/// Format diagnostics as JSON.
75///
76/// Serialization of these plain `#[derive(Serialize)]` structs cannot fail in
77/// practice, so we `expect` rather than swallowing the error into "[]":
78/// emitting an empty array on failure would make a CI pipeline read a broken
79/// run as "no issues" and pass.
80pub fn format_json(diagnostics: &[Diagnostic]) -> String {
81    serde_json::to_string_pretty(diagnostics).expect("diagnostics serialize to JSON")
82}
83
84/// Print a summary of lint results.
85pub fn format_summary(diagnostics: &[Diagnostic], file_count: usize) -> String {
86    let warning_count = diagnostics
87        .iter()
88        .filter(|d| d.severity == Severity::Warning)
89        .count();
90    let error_count = diagnostics
91        .iter()
92        .filter(|d| d.severity == Severity::Error)
93        .count();
94
95    if diagnostics.is_empty() {
96        format!(
97            "\n{} {} {} checked, no issues found.",
98            "✓".green(),
99            file_count,
100            pluralize(file_count, "file", "files")
101        )
102    } else {
103        let mut parts = Vec::new();
104        if error_count > 0 {
105            parts.push(
106                format(
107                    "{} {}",
108                    error_count,
109                    pluralize(error_count, "error", "errors")
110                )
111                .red()
112                .to_string(),
113            );
114        }
115        if warning_count > 0 {
116            parts.push(
117                format(
118                    "{} {}",
119                    warning_count,
120                    pluralize(warning_count, "warning", "warnings")
121                )
122                .yellow()
123                .to_string(),
124            );
125        }
126
127        format(
128            "\n{} {} checked, {} found.",
129            file_count,
130            pluralize(file_count, "file", "files"),
131            parts.join(", ")
132        )
133    }
134}
```

--------------------------------

### all_rules()

Source: https://docs.rs/gdstyle/0.2.5/gdstyle/rules/index.html

Returns a list of all available rule names, paired with a one-line human description. This function serves as the single source of truth for rule definitions.

```APIDOC
## all_rules()

### Description
Returns a list of all available rule names. Every lint rule is paired with a one-line human description. This is the single source of truth for rule definitions.

### Signature
`pub fn all_rules() -> Vec<(String, String)>`
```

--------------------------------

### Lexer Navigation and Whitespace Methods

Source: https://docs.rs/gdstyle/0.2.5/src/gdstyle/lexer.rs.html

Methods for managing lexer state, including character advancement and whitespace skipping logic.

```rust
    matches!(self.peek_char(), Some('"') | Some('\''))
    }

    fn is_at_end(&self) -> bool {
        self.position >= self.chars.len()
    }

    fn advance(&mut self) {
        if self.position < self.chars.len() {
            self.byte_offset += self.chars[self.position].len_utf8();
        }
        self.position += 1;
        self.column += 1;
    }

    /// Skip all leading whitespace (tabs and spaces) on a line inside brackets.
    fn skip_line_whitespace(&mut self) {
        while !self.is_at_end() && (self.current_char() == ' ' || self.current_char() == '\t') {
            self.advance();
        }
    }

    /// Skip mid-line whitespace.
    ///
    /// Spaces and tabs are consumed in ONE interleaved pass. Two sequential
    /// passes (all spaces, then all tabs) silently stranded anything after the
    /// first tab: a `\` continuation line indented `\t   ` — a tab for block
    /// depth plus spaces to align under the opening expression — left the
    /// lexer sitting on a space it had already stopped skipping, which
    /// surfaced as `unexpected character: ' '` on valid GDScript.
    fn skip_spaces(&mut self) {
        while !self.is_at_end() {
            match self.current_char() {
                ' ' => self.advance(),
                // At line start a tab is indentation and belongs to
                // process_indentation; mid-line it is just spacing.
                '\t' if !self.at_line_start => self.advance(),
                _ => return,
            }
        }
    }

    fn current_span(&self, length: usize) -> Span {
        Span::new(self.line, self.column, self.byte_offset, length)
    }
}
```

--------------------------------

### Test String Case Conversion Utilities

Source: https://docs.rs/gdstyle/0.2.5/src/gdstyle/rules/naming.rs.html

Verifies correct transformation of strings into snake_case and SCREAMING_SNAKE_CASE, including handling of acronyms and digit transitions.

```rust
    #[test]
    fn test_to_snake_case() {
        assert_eq!(to_snake_case("PlayerSpeed"), "player_speed");
        assert_eq!(to_snake_case("StateMachine"), "state_machine");
        assert_eq!(to_snake_case("_PrivateVar"), "_private_var");
        // S7: acronym handling
        assert_eq!(to_snake_case("AIInControl"), "ai_in_control");
        assert_eq!(to_snake_case("HTTPRequest"), "http_request");
        assert_eq!(to_snake_case("UIElement"), "ui_element");
        assert_eq!(to_snake_case("IOHandler"), "io_handler");
        assert_eq!(to_snake_case("GPUCompute"), "gpu_compute");
        assert_eq!(to_snake_case("SSEEvent"), "sse_event");
        assert_eq!(to_snake_case("HTMLParser"), "html_parser");
        assert_eq!(to_snake_case("APIKey"), "api_key");
        // Non-acronym cases still work
        assert_eq!(to_snake_case("PlayerInControl"), "player_in_control");
        assert_eq!(to_snake_case("None"), "none");
        // Digit-to-uppercase transitions
        assert_eq!(to_snake_case("Vector2D"), "vector_2d");
        assert_eq!(to_snake_case("Area2D"), "area_2d");
        assert_eq!(to_snake_case("Item3D"), "item_3d");
        assert_eq!(to_snake_case("Sprite2D"), "sprite_2d");
        assert_eq!(to_snake_case("Node2D"), "node_2d");
        // Digit in middle gets underscore before digit group
        assert_eq!(to_snake_case("player1speed"), "player_1speed");
    }
```

```rust
    #[test]
    fn test_to_screaming_snake_case() {
        assert_eq!(to_screaming_snake_case("maxSpeed"), "MAX_SPEED");
        assert_eq!(to_screaming_snake_case("PlayerState"), "PLAYER_STATE");
        // S7: acronym handling
        assert_eq!(to_screaming_snake_case("AIInControl"), "AI_IN_CONTROL");
        assert_eq!(to_screaming_snake_case("HTTPRequest"), "HTTP_REQUEST");
        assert_eq!(to_screaming_snake_case("UIElement"), "UI_ELEMENT");
        assert_eq!(to_screaming_snake_case("SSEEvent"), "SSE_EVENT");
        assert_eq!(
            to_screaming_snake_case("PlayerInControl"),
            "PLAYER_IN_CONTROL"
        );
        assert_eq!(to_screaming_snake_case("None"), "NONE");
    }
```

--------------------------------

### format_summary

Source: https://docs.rs/gdstyle/0.2.5/gdstyle/reporter/index.html

Prints a summary of the lint results to the output.

```APIDOC
## format_summary

### Description
Print a summary of lint results.

### Signature
`pub fn format_summary(diagnostics: &[Diagnostic])`
```

--------------------------------

### pub fn check_await_in_loop(file: &ScriptFile, diagnostics: &mut Vec<Diagnostic>)

Source: https://docs.rs/gdstyle/0.2.5/gdstyle/rules/quality/fn.check_await_in_loop.html

Analyzes a ScriptFile for await expressions inside loops and appends any found issues to the provided diagnostics vector.

```APIDOC
## Function: check_await_in_loop

### Description
Warns when `await` is used inside a `for` or `while` loop within the provided script file.

### Signature
`pub fn check_await_in_loop(file: &ScriptFile, diagnostics: &mut Vec<Diagnostic>)`

### Parameters
- **file** (&ScriptFile) - The script file to analyze.
- **diagnostics** (&mut Vec<Diagnostic>) - A mutable reference to a vector where detected issues will be stored.
```

--------------------------------

### Apply Deletion Fix

Source: https://docs.rs/gdstyle/0.2.5/src/gdstyle/fixer.rs.html

Demonstrates applying a deletion fix to a source string.

```rust
fn apply_deletion() {
        let source = "var x = 5   \n";
        let diags = vec![make_diag(9, 3, "", true)];
        let result = apply_fixes(source, &diags, true);
        assert_eq!(result, "var x = 5\n");
    }
```

--------------------------------

### Lexer Helper Methods

Source: https://docs.rs/gdstyle/0.2.5/src/gdstyle/lexer.rs.html

Utility methods for reading characters and peeking ahead in the input stream.

```rust
894    fn read_single_char(&mut self, kind: TokenKind) -> Token {
895        let span = self.current_span(1);
896        let text = self.current_char().to_string();
897        self.advance();
898        Token::new(kind, span, text)
899    }
900
901    // Helper methods.
902
903    fn current_char(&self) -> char {
904        self.chars[self.position]
905    }
906
907    fn peek_char(&self) -> Option<char> {
908        self.chars.get(self.position + 1).copied()
909    }
910
911    fn peek_char_at(&self, offset: usize) -> Option<char> {
912        self.chars.get(self.position + offset).copied()
913    }
914
915    fn peek_is_quote(&self) -> bool {
```

--------------------------------

### Execute Lint Rules

Source: https://docs.rs/gdstyle/0.2.5/src/gdstyle/rules/mod.rs.html

Conditional execution of various formatting, ordering, and quality rules based on the provided configuration.

```rust
        if let Some(src) = source {
            formatting::check_brace_spacing(tokens, file, src, &mut diagnostics);
        }
    }
    if config.is_rule_enabled("format/call-paren-spacing") {
        if let Some(src) = source {
            formatting::check_call_paren_spacing(tokens, file, src, &mut diagnostics);
        }
    }
    if config.is_rule_enabled("format/float-literal-zeros") {
        formatting::check_float_literal_zeros(tokens, file, &mut diagnostics);
    }
    if config.is_rule_enabled("format/large-number-underscores") {
        formatting::check_large_number_underscores(tokens, file, &mut diagnostics);
    }
    if config.is_rule_enabled("format/enum-one-per-line") {
        formatting::check_enum_one_per_line(file, source, &mut diagnostics);
    }

    // Ordering rules.
    if config.is_rule_enabled("order/class-member-order") {
        ordering::check_class_member_order(file, &mut diagnostics);
    }

    // Quality rules.
    if config.is_rule_enabled("quality/max-function-length") {
        quality::check_max_function_length(file, config, &mut diagnostics);
    }
    if config.is_rule_enabled("quality/max-file-length") {
        quality::check_max_file_length(file, config, &mut diagnostics);
    }
    if config.is_rule_enabled("quality/max-parameters") {
        quality::check_max_parameters(file, config, &mut diagnostics);
    }
    if config.is_rule_enabled("quality/unnecessary-pass") {
        quality::check_unnecessary_pass_in_functions(file, &mut diagnostics);
    }
    if config.is_rule_enabled("quality/no-debug-print") {
        quality::check_no_debug_print(tokens, file, &mut diagnostics);
    }
    if config.is_rule_enabled("quality/self-comparison") {
        quality::check_self_comparison(tokens, file, &mut diagnostics);
    }
    if config.is_rule_enabled("quality/no-self-assign") {
        quality::check_no_self_assign(tokens, file, &mut diagnostics);
    }
    if config.is_rule_enabled("quality/duplicate-dict-key") {
        quality::check_duplicate_dict_key(tokens, file, &mut diagnostics);
    }
    if config.is_rule_enabled("quality/duplicated-load") {
        quality::check_duplicated_load(tokens, file, &mut diagnostics);
    }
    if config.is_rule_enabled("quality/type-hint") {
        quality::check_type_hint(file, &mut diagnostics);
    }
    if config.is_rule_enabled("quality/empty-function") {
        quality::check_empty_function(file, &mut diagnostics);
    }
    if config.is_rule_enabled("quality/max-class-variables") {
        quality::check_max_class_variables(file, config, &mut diagnostics);
    }
    if config.is_rule_enabled("quality/max-public-methods") {
        quality::check_max_public_methods(file, config, &mut diagnostics);
    }
    if config.is_rule_enabled("quality/max-inner-classes") {
        quality::check_max_inner_classes(file, config, &mut diagnostics);
    }
    if config.is_rule_enabled("quality/no-else-return") {
        quality::check_no_else_return(file, &mut diagnostics);
    }
    if config.is_rule_enabled("quality/unreachable-code") {
        quality::check_unreachable_code(file, &mut diagnostics);
    }
    if config.is_rule_enabled("quality/await-in-loop") {
        quality::check_await_in_loop(file, &mut diagnostics);
    }
    if config.is_rule_enabled("quality/allocation-in-loop") {
        quality::check_allocation_in_loop(file, &mut diagnostics);
    }
    if config.is_rule_enabled("quality/process-get-node") {
        quality::check_process_get_node(file, &mut diagnostics);
    }
    if config.is_rule_enabled("quality/max-nesting-depth") {
        quality::check_max_nesting_depth(file, config, &mut diagnostics);
    }
    if config.is_rule_enabled("quality/max-returns") {
        quality::check_max_returns(file, config, &mut diagnostics);
    }
    if config.is_rule_enabled("quality/max-branches") {
        quality::check_max_branches(file, config, &mut diagnostics);
    }
    if config.is_rule_enabled("quality/max-local-variables") {
        quality::check_max_local_variables(file, config, &mut diagnostics);
    }

    // Sort diagnostics by line number.
    diagnostics.sort_by_key(|d| (d.span.line, d.span.column));
    diagnostics
}
```

--------------------------------

### all_rule_names function signature

Source: https://docs.rs/gdstyle/0.2.5/gdstyle/rules/fn.all_rule_names.html

Displays the function signature for retrieving all rule names.

```rust
pub fn all_rule_names() -> Vec<&'static str>
```

--------------------------------

### Test Special Syntax and Operators

Source: https://docs.rs/gdstyle/0.2.5/src/gdstyle/lexer.rs.html

Verifies tokenization of node paths, boolean operators, and raw strings.

```rust
#[test]
    fn dollar_sign_node_path() {
        let kinds = token_kinds("$Label");
        assert_eq!(
            kinds,
            vec![
                TokenKind::Dollar,
                TokenKind::Identifier("Label".to_string()),
            ]
        );
    }
```

```rust
#[test]
    fn boolean_operators() {
        let kinds = token_kinds("and or not");
        assert_eq!(kinds, vec![TokenKind::And, TokenKind::Or, TokenKind::Not]);
    }
```

```rust
#[test]
    fn raw_string() {
        let kinds = token_kinds("r\"hello\\nworld\"");
        assert!(
            matches!(kinds[0], TokenKind::String(ref s) if s.prefix == StringPrefix::Raw && s.value == "hello\\nworld")
        );
    }
```

--------------------------------

### to_pascal_case

Source: https://docs.rs/gdstyle/0.2.5/gdstyle/rules/naming/fn.to_pascal_case.html

Converts a string to PascalCase.

```APIDOC
## Function: to_pascal_case

### Description
Converts a provided string slice into PascalCase format.

### Signature
`pub fn to_pascal_case(name: &str) -> String`

### Parameters
- **name** (&str) - The input string to be converted.

### Returns
- **String** - The converted string in PascalCase.
```

--------------------------------

### format_file function signature

Source: https://docs.rs/gdstyle/0.2.5/gdstyle/formatter/fn.format_file.html

The function signature for formatting a file on disk.

```rust
pub fn format_file(path: &Path, config: &Config) -> Result<bool, String>
```