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#![cfg_attr(coverage_nightly, coverage(off))]
//! Location system for precise code positioning and qualified names.
use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use std::path::PathBuf;
use super::proof::ProofAnnotation;
/// Location system for precise code positioning
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct Location {
pub file_path: PathBuf,
pub span: Span,
}
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct Span {
pub start: BytePos,
pub end: BytePos,
}
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct BytePos(pub u32);
impl std::hash::Hash for Location {
fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
// Content-addressed hashing for deterministic cache keys
self.file_path.hash(state);
self.span.start.0.hash(state);
// End position omitted for prefix matching scenarios
}
}
impl Location {
/// Creates a new location from a file path and byte positions.
///
/// # Parameters
///
/// * `file_path` - The path to the source file
/// * `start` - Starting byte position in the file
/// * `end` - Ending byte position in the file
///
/// # Examples
///
/// ```rust
/// use pmat::models::unified_ast::{Location, BytePos, Span};
/// use std::path::PathBuf;
///
/// let location = Location::new(
/// PathBuf::from("src/main.rs"),
/// 100,
/// 150
/// );
///
/// assert_eq!(location.file_path, PathBuf::from("src/main.rs"));
/// assert_eq!(location.span.start.0, 100);
/// assert_eq!(location.span.end.0, 150);
/// assert_eq!(location.span.len(), 50);
/// ```
#[must_use]
pub fn new(file_path: PathBuf, start: u32, end: u32) -> Self {
Self {
file_path,
span: Span {
start: BytePos(start),
end: BytePos(end),
},
}
}
/// Checks if this location completely contains another location.
///
/// Two locations must be in the same file, and this location's span
/// must completely encompass the other location's span.
///
/// # Examples
///
/// ```rust
/// use pmat::models::unified_ast::Location;
/// use std::path::PathBuf;
///
/// let file = PathBuf::from("test.rs");
/// let outer = Location::new(file.clone(), 0, 100);
/// let inner = Location::new(file.clone(), 10, 50);
/// let separate = Location::new(PathBuf::from("other.rs"), 0, 100);
///
/// assert!(outer.contains(&inner));
/// assert!(!inner.contains(&outer));
/// assert!(!outer.contains(&separate)); // Different files
/// ```
#[must_use]
pub fn contains(&self, other: &Location) -> bool {
self.file_path == other.file_path
&& self.span.start <= other.span.start
&& self.span.end >= other.span.end
}
/// Checks if this location overlaps with another location.
///
/// Two locations overlap if they are in the same file and their
/// byte ranges intersect (even partially).
///
/// # Examples
///
/// ```rust
/// use pmat::models::unified_ast::{Location, BytePos, Span};
/// use std::path::PathBuf;
///
/// let file = PathBuf::from("test.rs");
/// let loc1 = Location::new(file.clone(), 0, 50);
/// let loc2 = Location::new(file.clone(), 25, 75); // Overlaps
/// let loc3 = Location::new(file.clone(), 100, 150); // No overlap
/// let loc4 = Location::new(PathBuf::from("other.rs"), 0, 100); // Different file
///
/// assert!(loc1.overlaps(&loc2));
/// assert!(loc2.overlaps(&loc1));
/// assert!(!loc1.overlaps(&loc3));
/// assert!(!loc1.overlaps(&loc4));
/// ```
#[must_use]
pub fn overlaps(&self, other: &Location) -> bool {
self.file_path == other.file_path
&& self.span.start < other.span.end
&& other.span.start < self.span.end
}
}
impl Span {
#[must_use]
pub fn new(start: u32, end: u32) -> Self {
Self {
start: BytePos(start),
end: BytePos(end),
}
}
#[must_use]
pub fn len(&self) -> u32 {
self.end.0 - self.start.0
}
#[must_use]
pub fn is_empty(&self) -> bool {
self.start.0 >= self.end.0
}
#[must_use]
pub fn contains(&self, pos: BytePos) -> bool {
self.start <= pos && pos < self.end
}
}
impl BytePos {
#[must_use]
pub fn to_usize(self) -> usize {
self.0 as usize
}
/// Creates a `BytePos` from a usize position
///
/// # Examples
///
/// ```rust
/// use pmat::models::unified_ast::BytePos;
///
/// let pos = BytePos::from_usize(42);
/// assert_eq!(pos.to_usize(), 42);
/// ```
#[must_use]
pub fn from_usize(pos: usize) -> Self {
Self(pos as u32)
}
}
/// Qualified name for symbol resolution
#[derive(Debug, Clone, Hash, PartialEq, Eq)]
pub struct QualifiedName {
pub module_path: Vec<String>,
pub name: String,
pub disambiguator: Option<u32>, // For overloaded names
}
impl QualifiedName {
/// Creates a new qualified name from module path and name components.
///
/// # Parameters
///
/// * `module_path` - Vector of module/namespace components
/// * `name` - The final name component (function, type, etc.)
///
/// # Examples
///
/// ```rust
/// use pmat::models::unified_ast::QualifiedName;
///
/// let qname = QualifiedName::new(
/// vec!["std".to_string(), "collections".to_string()],
/// "HashMap".to_string()
/// );
///
/// assert_eq!(qname.module_path, vec!["std", "collections"]);
/// assert_eq!(qname.name, "HashMap");
/// assert!(qname.disambiguator.is_none());
/// assert_eq!(qname.to_qualified_string(), "std::collections::HashMap");
/// ```
#[must_use]
pub fn new(module_path: Vec<String>, name: String) -> Self {
Self {
module_path,
name,
disambiguator: None,
}
}
#[must_use]
pub fn with_disambiguator(mut self, disambiguator: u32) -> Self {
self.disambiguator = Some(disambiguator);
self
}
/// Creates a qualified name from a string representation.
///
/// Parses strings in the format "`module::submodule::Name`" where
/// "::" separates module components from the final name.
///
/// # Examples
///
/// ```rust
/// use pmat::models::unified_ast::QualifiedName;
///
/// // Simple name without module path
/// let simple = QualifiedName::from_string("main").expect("internal error");
/// assert_eq!(simple.name, "main");
/// assert!(simple.module_path.is_empty());
///
/// // Fully qualified name
/// let qualified = QualifiedName::from_string("std::collections::HashMap").expect("internal error");
/// assert_eq!(qualified.module_path, vec!["std", "collections"]);
/// assert_eq!(qualified.name, "HashMap");
///
/// // Error case
/// assert!(QualifiedName::from_string("").is_err());
/// ```
pub fn from_string(qualified_str: &str) -> Result<Self, &'static str> {
if qualified_str.is_empty() {
return Err("Empty qualified name");
}
let parts: Vec<&str> = qualified_str.split("::").collect();
let name = (*parts.last().expect("internal error")).to_string();
if name.is_empty() {
return Err("Empty qualified name");
}
let module_path = parts[..parts.len() - 1]
.iter()
.map(|s| (*s).to_string())
.collect();
Ok(Self {
module_path,
name,
disambiguator: None,
})
}
/// Converts the qualified name back to its string representation.
///
/// Creates a string in the format "`module::submodule::Name`", with
/// optional disambiguator suffix "#N" for overloaded names.
///
/// # Examples
///
/// ```rust
/// use pmat::models::unified_ast::QualifiedName;
///
/// let qname = QualifiedName::new(
/// vec!["crate".to_string(), "module".to_string()],
/// "function".to_string()
/// );
/// assert_eq!(qname.to_qualified_string(), "crate::module::function");
///
/// // With disambiguator
/// let overloaded = qname.with_disambiguator(1);
/// assert_eq!(overloaded.to_qualified_string(), "crate::module::function#1");
///
/// // Simple name without modules
/// let simple = QualifiedName::new(vec![], "main".to_string());
/// assert_eq!(simple.to_qualified_string(), "main");
/// ```
#[must_use]
pub fn to_qualified_string(&self) -> String {
let mut result = self.module_path.join("::");
if !result.is_empty() {
result.push_str("::");
}
result.push_str(&self.name);
if let Some(disambiguator) = self.disambiguator {
result.push_str(&format!("#{disambiguator}"));
}
result
}
}
impl std::str::FromStr for QualifiedName {
type Err = &'static str;
fn from_str(s: &str) -> Result<Self, Self::Err> {
Self::from_string(s)
}
}
impl std::fmt::Display for QualifiedName {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "{}", self.to_qualified_string())
}
}
/// Relative location types for companion files
#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(tag = "type")]
pub enum RelativeLocation {
Function {
name: String,
#[serde(skip_serializing_if = "Option::is_none")]
module: Option<String>,
},
Symbol {
qualified_name: String, // e.g., "crate::module::Type::method"
},
Span {
start: u32,
end: u32,
},
}
/// Type alias for proof mappings
pub type ProofMap = HashMap<Location, Vec<ProofAnnotation>>;