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//! Definitions of name-related helpers and newtypes, primarily for the
//! component model.
use crate::prelude::*;
use crate::{Result, WasmFeatures};
use core::borrow::Borrow;
use core::cmp::Ordering;
use core::fmt;
use core::hash::{Hash, Hasher};
use core::ops::Deref;
use semver::Version;
/// Represents a kebab string slice used in validation.
///
/// This is a wrapper around `str` that ensures the slice is
/// a valid kebab case string according to the component model
/// specification.
///
/// It also provides an equality and hashing implementation
/// that ignores ASCII case.
#[derive(Debug, Eq)]
#[repr(transparent)]
pub struct KebabStr(str);
impl KebabStr {
/// Creates a new kebab string slice.
///
/// Returns `None` if the given string is not a valid kebab string.
pub fn new<'a>(s: impl AsRef<str> + 'a) -> Option<&'a Self> {
let s = Self::new_unchecked(s);
if s.is_kebab_case() {
Some(s)
} else {
None
}
}
pub(crate) fn new_unchecked<'a>(s: impl AsRef<str> + 'a) -> &'a Self {
// Safety: `KebabStr` is a transparent wrapper around `str`
// Therefore transmuting `&str` to `&KebabStr` is safe.
#[allow(unsafe_code)]
unsafe {
core::mem::transmute::<_, &Self>(s.as_ref())
}
}
/// Gets the underlying string slice.
pub fn as_str(&self) -> &str {
&self.0
}
/// Converts the slice to an owned string.
pub fn to_kebab_string(&self) -> KebabString {
KebabString(self.to_string())
}
fn is_kebab_case(&self) -> bool {
let mut lower = false;
let mut upper = false;
for c in self.chars() {
match c {
'a'..='z' if !lower && !upper => lower = true,
'A'..='Z' if !lower && !upper => upper = true,
'a'..='z' if lower => {}
'A'..='Z' if upper => {}
'0'..='9' if lower || upper => {}
'-' if lower || upper => {
lower = false;
upper = false;
}
_ => return false,
}
}
!self.is_empty() && !self.ends_with('-')
}
}
impl Deref for KebabStr {
type Target = str;
fn deref(&self) -> &str {
self.as_str()
}
}
impl PartialEq for KebabStr {
fn eq(&self, other: &Self) -> bool {
if self.len() != other.len() {
return false;
}
self.chars()
.zip(other.chars())
.all(|(a, b)| a.to_ascii_lowercase() == b.to_ascii_lowercase())
}
}
impl PartialEq<KebabString> for KebabStr {
fn eq(&self, other: &KebabString) -> bool {
self.eq(other.as_kebab_str())
}
}
impl Ord for KebabStr {
fn cmp(&self, other: &Self) -> Ordering {
let self_chars = self.chars().map(|c| c.to_ascii_lowercase());
let other_chars = other.chars().map(|c| c.to_ascii_lowercase());
self_chars.cmp(other_chars)
}
}
impl PartialOrd for KebabStr {
fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
Some(self.cmp(other))
}
}
impl Hash for KebabStr {
fn hash<H: Hasher>(&self, state: &mut H) {
self.len().hash(state);
for b in self.chars() {
b.to_ascii_lowercase().hash(state);
}
}
}
impl fmt::Display for KebabStr {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
(self as &str).fmt(f)
}
}
impl ToOwned for KebabStr {
type Owned = KebabString;
fn to_owned(&self) -> Self::Owned {
self.to_kebab_string()
}
}
/// Represents an owned kebab string for validation.
///
/// This is a wrapper around `String` that ensures the string is
/// a valid kebab case string according to the component model
/// specification.
///
/// It also provides an equality and hashing implementation
/// that ignores ASCII case.
#[derive(Debug, Clone, Eq)]
pub struct KebabString(String);
impl KebabString {
/// Creates a new kebab string.
///
/// Returns `None` if the given string is not a valid kebab string.
pub fn new(s: impl Into<String>) -> Option<Self> {
let s = s.into();
if KebabStr::new(&s).is_some() {
Some(Self(s))
} else {
None
}
}
/// Gets the underlying string.
pub fn as_str(&self) -> &str {
self.0.as_str()
}
/// Converts the kebab string to a kebab string slice.
pub fn as_kebab_str(&self) -> &KebabStr {
// Safety: internal string is always valid kebab-case
KebabStr::new_unchecked(self.as_str())
}
}
impl Deref for KebabString {
type Target = KebabStr;
fn deref(&self) -> &Self::Target {
self.as_kebab_str()
}
}
impl Borrow<KebabStr> for KebabString {
fn borrow(&self) -> &KebabStr {
self.as_kebab_str()
}
}
impl Ord for KebabString {
fn cmp(&self, other: &Self) -> Ordering {
self.as_kebab_str().cmp(other.as_kebab_str())
}
}
impl PartialOrd for KebabString {
fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
self.as_kebab_str().partial_cmp(other.as_kebab_str())
}
}
impl PartialEq for KebabString {
fn eq(&self, other: &Self) -> bool {
self.as_kebab_str().eq(other.as_kebab_str())
}
}
impl PartialEq<KebabStr> for KebabString {
fn eq(&self, other: &KebabStr) -> bool {
self.as_kebab_str().eq(other)
}
}
impl Hash for KebabString {
fn hash<H: Hasher>(&self, state: &mut H) {
self.as_kebab_str().hash(state)
}
}
impl fmt::Display for KebabString {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
self.as_kebab_str().fmt(f)
}
}
impl From<KebabString> for String {
fn from(s: KebabString) -> String {
s.0
}
}
/// An import or export name in the component model which is backed by `T`,
/// which defaults to `String`.
///
/// This name can be either:
///
/// * a plain label or "kebab string": `a-b-c`
/// * a plain method name : `[method]a-b.c-d`
/// * a plain static method name : `[static]a-b.c-d`
/// * a plain constructor: `[constructor]a-b`
/// * an interface name: `wasi:cli/reactor@0.1.0`
/// * a dependency name: `locked-dep=foo:bar/baz`
/// * a hash name: `integrity=sha256:...`
///
/// # Equality and hashing
///
/// Note that this type the `[method]...` and `[static]...` variants are
/// considered equal and hash to the same value. This enables disallowing
/// clashes between the two where method name overlap cannot happen.
#[derive(Clone)]
pub struct ComponentName {
raw: String,
kind: ParsedComponentNameKind,
}
#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord)]
enum ParsedComponentNameKind {
Label,
Constructor,
Method,
Static,
Interface,
Dependency,
Url,
Hash,
}
/// Created via [`ComponentName::kind`] and classifies a name.
#[derive(Debug, Clone)]
pub enum ComponentNameKind<'a> {
/// `a-b-c`
Label(&'a KebabStr),
/// `[constructor]a-b`
Constructor(&'a KebabStr),
/// `[method]a-b.c-d`
#[allow(missing_docs)]
Method(ResourceFunc<'a>),
/// `[static]a-b.c-d`
#[allow(missing_docs)]
Static(ResourceFunc<'a>),
/// `wasi:http/types@2.0`
#[allow(missing_docs)]
Interface(InterfaceName<'a>),
/// `locked-dep=foo:bar/baz`
#[allow(missing_docs)]
Dependency(DependencyName<'a>),
#[allow(missing_docs)]
Url(UrlName<'a>),
/// `integrity=sha256:...`
#[allow(missing_docs)]
Hash(HashName<'a>),
}
const CONSTRUCTOR: &str = "[constructor]";
const METHOD: &str = "[method]";
const STATIC: &str = "[static]";
impl ComponentName {
/// Attempts to parse `name` as a valid component name, returning `Err` if
/// it's not valid.
pub fn new(name: &str, offset: usize) -> Result<ComponentName> {
Self::new_with_features(name, offset, WasmFeatures::default())
}
/// Attempts to parse `name` as a valid component name, returning `Err` if
/// it's not valid.
///
/// `features` can be used to enable or disable validation of certain forms
/// of supported import names.
pub fn new_with_features(name: &str, offset: usize, features: WasmFeatures) -> Result<Self> {
let mut parser = ComponentNameParser {
next: name,
offset,
features,
};
let kind = parser.parse()?;
if !parser.next.is_empty() {
bail!(offset, "trailing characters found: `{}`", parser.next);
}
Ok(ComponentName {
raw: name.to_string(),
kind,
})
}
/// Returns the [`ComponentNameKind`] corresponding to this name.
pub fn kind(&self) -> ComponentNameKind<'_> {
use ComponentNameKind::*;
use ParsedComponentNameKind as PK;
match self.kind {
PK::Label => Label(KebabStr::new_unchecked(&self.raw)),
PK::Constructor => Constructor(KebabStr::new_unchecked(&self.raw[CONSTRUCTOR.len()..])),
PK::Method => Method(ResourceFunc(&self.raw[METHOD.len()..])),
PK::Static => Static(ResourceFunc(&self.raw[STATIC.len()..])),
PK::Interface => Interface(InterfaceName(&self.raw)),
PK::Dependency => Dependency(DependencyName(&self.raw)),
PK::Url => Url(UrlName(&self.raw)),
PK::Hash => Hash(HashName(&self.raw)),
}
}
/// Returns the raw underlying name as a string.
pub fn as_str(&self) -> &str {
&self.raw
}
}
impl From<ComponentName> for String {
fn from(name: ComponentName) -> String {
name.raw
}
}
impl Hash for ComponentName {
fn hash<H: Hasher>(&self, hasher: &mut H) {
self.kind().hash(hasher)
}
}
impl PartialEq for ComponentName {
fn eq(&self, other: &ComponentName) -> bool {
self.kind().eq(&other.kind())
}
}
impl Eq for ComponentName {}
impl Ord for ComponentName {
fn cmp(&self, other: &ComponentName) -> Ordering {
self.kind().cmp(&other.kind())
}
}
impl PartialOrd for ComponentName {
fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
self.kind.partial_cmp(&other.kind)
}
}
impl fmt::Display for ComponentName {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
self.raw.fmt(f)
}
}
impl fmt::Debug for ComponentName {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
self.raw.fmt(f)
}
}
impl ComponentNameKind<'_> {
/// Returns the [`ParsedComponentNameKind`] of the [`ComponentNameKind`].
fn kind(&self) -> ParsedComponentNameKind {
match self {
Self::Label(_) => ParsedComponentNameKind::Label,
Self::Constructor(_) => ParsedComponentNameKind::Constructor,
Self::Method(_) => ParsedComponentNameKind::Method,
Self::Static(_) => ParsedComponentNameKind::Static,
Self::Interface(_) => ParsedComponentNameKind::Interface,
Self::Dependency(_) => ParsedComponentNameKind::Dependency,
Self::Url(_) => ParsedComponentNameKind::Url,
Self::Hash(_) => ParsedComponentNameKind::Hash,
}
}
}
impl Ord for ComponentNameKind<'_> {
fn cmp(&self, other: &Self) -> Ordering {
match self.kind().cmp(&other.kind()) {
Ordering::Equal => (),
unequal => return unequal,
}
match (self, other) {
(ComponentNameKind::Label(lhs), ComponentNameKind::Label(rhs)) => lhs.cmp(rhs),
(ComponentNameKind::Constructor(lhs), ComponentNameKind::Constructor(rhs)) => {
lhs.cmp(rhs)
}
(ComponentNameKind::Method(lhs), ComponentNameKind::Method(rhs)) => lhs.cmp(rhs),
(ComponentNameKind::Method(lhs), ComponentNameKind::Static(rhs)) => lhs.cmp(rhs),
(ComponentNameKind::Static(lhs), ComponentNameKind::Method(rhs)) => lhs.cmp(rhs),
(ComponentNameKind::Static(lhs), ComponentNameKind::Static(rhs)) => lhs.cmp(rhs),
(ComponentNameKind::Interface(lhs), ComponentNameKind::Interface(rhs)) => lhs.cmp(rhs),
(ComponentNameKind::Dependency(lhs), ComponentNameKind::Dependency(rhs)) => {
lhs.cmp(rhs)
}
(ComponentNameKind::Url(lhs), ComponentNameKind::Url(rhs)) => lhs.cmp(rhs),
(ComponentNameKind::Hash(lhs), ComponentNameKind::Hash(rhs)) => lhs.cmp(rhs),
_ => unreachable!("already compared for different kinds above"),
}
}
}
impl PartialOrd for ComponentNameKind<'_> {
fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
Some(self.cmp(other))
}
}
impl Hash for ComponentNameKind<'_> {
fn hash<H: Hasher>(&self, hasher: &mut H) {
use ComponentNameKind::*;
match self {
Label(name) => (0u8, name).hash(hasher),
Constructor(name) => (1u8, name).hash(hasher),
// for hashing method == static
Method(name) | Static(name) => (2u8, name).hash(hasher),
Interface(name) => (3u8, name).hash(hasher),
Dependency(name) => (4u8, name).hash(hasher),
Url(name) => (5u8, name).hash(hasher),
Hash(name) => (6u8, name).hash(hasher),
}
}
}
impl PartialEq for ComponentNameKind<'_> {
fn eq(&self, other: &ComponentNameKind<'_>) -> bool {
use ComponentNameKind::*;
match (self, other) {
(Label(a), Label(b)) => a == b,
(Label(_), _) => false,
(Constructor(a), Constructor(b)) => a == b,
(Constructor(_), _) => false,
// method == static for the purposes of hashing so equate them here
// as well.
(Method(a), Method(b))
| (Static(a), Static(b))
| (Method(a), Static(b))
| (Static(a), Method(b)) => a == b,
(Method(_), _) => false,
(Static(_), _) => false,
(Interface(a), Interface(b)) => a == b,
(Interface(_), _) => false,
(Dependency(a), Dependency(b)) => a == b,
(Dependency(_), _) => false,
(Url(a), Url(b)) => a == b,
(Url(_), _) => false,
(Hash(a), Hash(b)) => a == b,
(Hash(_), _) => false,
}
}
}
impl Eq for ComponentNameKind<'_> {}
/// A resource name and its function, stored as `a.b`.
#[derive(Debug, Clone, Hash, Eq, PartialEq, Ord, PartialOrd)]
pub struct ResourceFunc<'a>(&'a str);
impl<'a> ResourceFunc<'a> {
/// Returns the the underlying string as `a.b`
pub fn as_str(&self) -> &'a str {
self.0
}
/// Returns the resource name or the `a` in `a.b`
pub fn resource(&self) -> &'a KebabStr {
let dot = self.0.find('.').unwrap();
KebabStr::new_unchecked(&self.0[..dot])
}
}
/// An interface name, stored as `a:b/c@1.2.3`
#[derive(Debug, Clone, Hash, Eq, PartialEq, Ord, PartialOrd)]
pub struct InterfaceName<'a>(&'a str);
impl<'a> InterfaceName<'a> {
/// Returns the entire underlying string.
pub fn as_str(&self) -> &'a str {
self.0
}
/// Returns the `a:b` in `a:b:c/d/e`
pub fn namespace(&self) -> &'a KebabStr {
let colon = self.0.rfind(':').unwrap();
KebabStr::new_unchecked(&self.0[..colon])
}
/// Returns the `c` in `a:b:c/d/e`
pub fn package(&self) -> &'a KebabStr {
let colon = self.0.rfind(':').unwrap();
let slash = self.0.find('/').unwrap();
KebabStr::new_unchecked(&self.0[colon + 1..slash])
}
/// Returns the `d` in `a:b:c/d/e`.
pub fn interface(&self) -> &'a KebabStr {
let projection = self.projection();
let slash = projection.find('/').unwrap_or(projection.len());
KebabStr::new_unchecked(&projection[..slash])
}
/// Returns the `d/e` in `a:b:c/d/e`
pub fn projection(&self) -> &'a KebabStr {
let slash = self.0.find('/').unwrap();
let at = self.0.find('@').unwrap_or(self.0.len());
KebabStr::new_unchecked(&self.0[slash + 1..at])
}
/// Returns the `1.2.3` in `a:b:c/d/e@1.2.3`
pub fn version(&self) -> Option<Version> {
let at = self.0.find('@')?;
Some(Version::parse(&self.0[at + 1..]).unwrap())
}
}
/// A dependency on an implementation either as `locked-dep=...` or
/// `unlocked-dep=...`
#[derive(Debug, Clone, Hash, Eq, PartialEq, Ord, PartialOrd)]
pub struct DependencyName<'a>(&'a str);
impl<'a> DependencyName<'a> {
/// Returns entire underlying import string
pub fn as_str(&self) -> &'a str {
self.0
}
}
/// A dependency on an implementation either as `url=...`
#[derive(Debug, Clone, Hash, Eq, PartialEq, Ord, PartialOrd)]
pub struct UrlName<'a>(&'a str);
impl<'a> UrlName<'a> {
/// Returns entire underlying import string
pub fn as_str(&self) -> &'a str {
self.0
}
}
/// A dependency on an implementation either as `integrity=...`.
#[derive(Debug, Clone, Hash, Eq, PartialEq, Ord, PartialOrd)]
pub struct HashName<'a>(&'a str);
impl<'a> HashName<'a> {
/// Returns entire underlying import string.
pub fn as_str(&self) -> &'a str {
self.0
}
}
// A small helper structure to parse `self.next` which is an import or export
// name.
//
// Methods will update `self.next` as they go along and `self.offset` is used
// for error messages.
struct ComponentNameParser<'a> {
next: &'a str,
offset: usize,
features: WasmFeatures,
}
impl<'a> ComponentNameParser<'a> {
fn parse(&mut self) -> Result<ParsedComponentNameKind> {
if self.eat_str(CONSTRUCTOR) {
self.expect_kebab()?;
return Ok(ParsedComponentNameKind::Constructor);
}
if self.eat_str(METHOD) {
let resource = self.take_until('.')?;
self.kebab(resource)?;
self.expect_kebab()?;
return Ok(ParsedComponentNameKind::Method);
}
if self.eat_str(STATIC) {
let resource = self.take_until('.')?;
self.kebab(resource)?;
self.expect_kebab()?;
return Ok(ParsedComponentNameKind::Static);
}
// 'unlocked-dep=<' <pkgnamequery> '>'
if self.eat_str("unlocked-dep=") {
self.expect_str("<")?;
self.pkg_name_query()?;
self.expect_str(">")?;
return Ok(ParsedComponentNameKind::Dependency);
}
// 'locked-dep=<' <pkgname> '>' ( ',' <hashname> )?
if self.eat_str("locked-dep=") {
self.expect_str("<")?;
self.pkg_name(false)?;
self.expect_str(">")?;
self.eat_optional_hash()?;
return Ok(ParsedComponentNameKind::Dependency);
}
// 'url=<' <nonbrackets> '>' (',' <hashname>)?
if self.eat_str("url=") {
self.expect_str("<")?;
let url = self.take_up_to('>')?;
if url.contains('<') {
bail!(self.offset, "url cannot contain `<`");
}
self.expect_str(">")?;
self.eat_optional_hash()?;
return Ok(ParsedComponentNameKind::Url);
}
// 'integrity=<' <integrity-metadata> '>'
if self.eat_str("integrity=") {
self.expect_str("<")?;
let _hash = self.parse_hash()?;
self.expect_str(">")?;
return Ok(ParsedComponentNameKind::Hash);
}
if self.next.contains(':') {
self.pkg_name(true)?;
Ok(ParsedComponentNameKind::Interface)
} else {
self.expect_kebab()?;
Ok(ParsedComponentNameKind::Label)
}
}
// pkgnamequery ::= <pkgpath> <verrange>?
fn pkg_name_query(&mut self) -> Result<()> {
self.pkg_path(false)?;
if self.eat_str("@") {
if self.eat_str("*") {
return Ok(());
}
self.expect_str("{")?;
let range = self.take_up_to('}')?;
self.expect_str("}")?;
self.semver_range(range)?;
}
Ok(())
}
// pkgname ::= <pkgpath> <version>?
fn pkg_name(&mut self, require_projection: bool) -> Result<()> {
self.pkg_path(require_projection)?;
if self.eat_str("@") {
let version = match self.eat_up_to('>') {
Some(version) => version,
None => self.take_rest(),
};
self.semver(version)?;
}
Ok(())
}
// pkgpath ::= <namespace>+ <label> <projection>*
fn pkg_path(&mut self, require_projection: bool) -> Result<()> {
// There must be at least one package namespace
self.take_lowercase_kebab()?;
self.expect_str(":")?;
self.take_lowercase_kebab()?;
if self.features.component_model_nested_names() {
// Take the remaining package namespaces and name
while self.next.starts_with(':') {
self.expect_str(":")?;
self.take_lowercase_kebab()?;
}
}
// Take the projections
if self.next.starts_with('/') {
self.expect_str("/")?;
self.take_kebab()?;
if self.features.component_model_nested_names() {
while self.next.starts_with('/') {
self.expect_str("/")?;
self.take_kebab()?;
}
}
} else if require_projection {
bail!(self.offset, "expected `/` after package name");
}
Ok(())
}
// verrange ::= '@*'
// | '@{' <verlower> '}'
// | '@{' <verupper> '}'
// | '@{' <verlower> ' ' <verupper> '}'
// verlower ::= '>=' <valid semver>
// verupper ::= '<' <valid semver>
fn semver_range(&self, range: &str) -> Result<()> {
if range == "*" {
return Ok(());
}
if let Some(range) = range.strip_prefix(">=") {
let (lower, upper) = range
.split_once(' ')
.map(|(l, u)| (l, Some(u)))
.unwrap_or((range, None));
self.semver(lower)?;
if let Some(upper) = upper {
match upper.strip_prefix('<') {
Some(upper) => {
self.semver(upper)?;
}
None => bail!(
self.offset,
"expected `<` at start of version range upper bounds"
),
}
}
} else if let Some(upper) = range.strip_prefix('<') {
self.semver(upper)?;
} else {
bail!(
self.offset,
"expected `>=` or `<` at start of version range"
);
}
Ok(())
}
fn parse_hash(&mut self) -> Result<&'a str> {
let integrity = self.take_up_to('>')?;
let mut any = false;
for hash in integrity.split_whitespace() {
any = true;
let rest = hash
.strip_prefix("sha256")
.or_else(|| hash.strip_prefix("sha384"))
.or_else(|| hash.strip_prefix("sha512"));
let rest = match rest {
Some(s) => s,
None => bail!(self.offset, "unrecognized hash algorithm: `{hash}`"),
};
let rest = match rest.strip_prefix('-') {
Some(s) => s,
None => bail!(self.offset, "expected `-` after hash algorithm: {hash}"),
};
let (base64, _options) = match rest.find('?') {
Some(i) => (&rest[..i], Some(&rest[i + 1..])),
None => (rest, None),
};
if !is_base64(base64) {
bail!(self.offset, "not valid base64: `{base64}`");
}
}
if !any {
bail!(self.offset, "integrity hash cannot be empty");
}
Ok(integrity)
}
fn eat_optional_hash(&mut self) -> Result<Option<&'a str>> {
if !self.eat_str(",") {
return Ok(None);
}
self.expect_str("integrity=<")?;
let ret = self.parse_hash()?;
self.expect_str(">")?;
Ok(Some(ret))
}
fn eat_str(&mut self, prefix: &str) -> bool {
match self.next.strip_prefix(prefix) {
Some(rest) => {
self.next = rest;
true
}
None => false,
}
}
fn expect_str(&mut self, prefix: &str) -> Result<()> {
if self.eat_str(prefix) {
Ok(())
} else {
bail!(self.offset, "expected `{prefix}` at `{}`", self.next);
}
}
fn eat_until(&mut self, c: char) -> Option<&'a str> {
let ret = self.eat_up_to(c);
if ret.is_some() {
self.next = &self.next[c.len_utf8()..];
}
ret
}
fn eat_up_to(&mut self, c: char) -> Option<&'a str> {
let i = self.next.find(c)?;
let (a, b) = self.next.split_at(i);
self.next = b;
Some(a)
}
fn kebab(&self, s: &'a str) -> Result<&'a KebabStr> {
match KebabStr::new(s) {
Some(name) => Ok(name),
None => bail!(self.offset, "`{s}` is not in kebab case"),
}
}
fn semver(&self, s: &str) -> Result<Version> {
match Version::parse(s) {
Ok(v) => Ok(v),
Err(e) => bail!(self.offset, "`{s}` is not a valid semver: {e}"),
}
}
fn take_until(&mut self, c: char) -> Result<&'a str> {
match self.eat_until(c) {
Some(s) => Ok(s),
None => bail!(self.offset, "failed to find `{c}` character"),
}
}
fn take_up_to(&mut self, c: char) -> Result<&'a str> {
match self.eat_up_to(c) {
Some(s) => Ok(s),
None => bail!(self.offset, "failed to find `{c}` character"),
}
}
fn take_rest(&mut self) -> &'a str {
let ret = self.next;
self.next = "";
ret
}
fn take_kebab(&mut self) -> Result<&'a KebabStr> {
self.next
.find(|c| !matches!(c, 'a'..='z' | 'A'..='Z' | '0'..='9' | '-'))
.map(|i| {
let (kebab, next) = self.next.split_at(i);
self.next = next;
self.kebab(kebab)
})
.unwrap_or_else(|| self.expect_kebab())
}
fn take_lowercase_kebab(&mut self) -> Result<&'a KebabStr> {
let kebab = self.take_kebab()?;
if let Some(c) = kebab
.chars()
.find(|c| c.is_alphabetic() && !c.is_lowercase())
{
bail!(
self.offset,
"character `{c}` is not lowercase in package name/namespace"
);
}
Ok(kebab)
}
fn expect_kebab(&mut self) -> Result<&'a KebabStr> {
let s = self.take_rest();
self.kebab(s)
}
}
fn is_base64(s: &str) -> bool {
if s.is_empty() {
return false;
}
let mut equals = 0;
for (i, byte) in s.as_bytes().iter().enumerate() {
match byte {
b'0'..=b'9' | b'a'..=b'z' | b'A'..=b'Z' | b'+' | b'/' if equals == 0 => {}
b'=' if i > 0 && equals < 2 => equals += 1,
_ => return false,
}
}
true
}
#[cfg(test)]
mod tests {
use super::*;
use std::collections::HashSet;
fn parse_kebab_name(s: &str) -> Option<ComponentName> {
ComponentName::new(s, 0).ok()
}
#[test]
fn kebab_smoke() {
assert!(KebabStr::new("").is_none());
assert!(KebabStr::new("a").is_some());
assert!(KebabStr::new("aB").is_none());
assert!(KebabStr::new("a-B").is_some());
assert!(KebabStr::new("a-").is_none());
assert!(KebabStr::new("-").is_none());
assert!(KebabStr::new("ΒΆ").is_none());
assert!(KebabStr::new("0").is_none());
assert!(KebabStr::new("a0").is_some());
assert!(KebabStr::new("a-0").is_none());
}
#[test]
fn name_smoke() {
assert!(parse_kebab_name("a").is_some());
assert!(parse_kebab_name("[foo]a").is_none());
assert!(parse_kebab_name("[constructor]a").is_some());
assert!(parse_kebab_name("[method]a").is_none());
assert!(parse_kebab_name("[method]a.b").is_some());
assert!(parse_kebab_name("[method]a.b.c").is_none());
assert!(parse_kebab_name("[static]a.b").is_some());
assert!(parse_kebab_name("[static]a").is_none());
}
#[test]
fn name_equality() {
assert_eq!(parse_kebab_name("a"), parse_kebab_name("a"));
assert_ne!(parse_kebab_name("a"), parse_kebab_name("b"));
assert_eq!(
parse_kebab_name("[constructor]a"),
parse_kebab_name("[constructor]a")
);
assert_ne!(
parse_kebab_name("[constructor]a"),
parse_kebab_name("[constructor]b")
);
assert_eq!(
parse_kebab_name("[method]a.b"),
parse_kebab_name("[method]a.b")
);
assert_ne!(
parse_kebab_name("[method]a.b"),
parse_kebab_name("[method]b.b")
);
assert_eq!(
parse_kebab_name("[static]a.b"),
parse_kebab_name("[static]a.b")
);
assert_ne!(
parse_kebab_name("[static]a.b"),
parse_kebab_name("[static]b.b")
);
assert_eq!(
parse_kebab_name("[static]a.b"),
parse_kebab_name("[method]a.b")
);
assert_eq!(
parse_kebab_name("[method]a.b"),
parse_kebab_name("[static]a.b")
);
assert_ne!(
parse_kebab_name("[method]b.b"),
parse_kebab_name("[static]a.b")
);
let mut s = HashSet::new();
assert!(s.insert(parse_kebab_name("a")));
assert!(s.insert(parse_kebab_name("[constructor]a")));
assert!(s.insert(parse_kebab_name("[method]a.b")));
assert!(!s.insert(parse_kebab_name("[static]a.b")));
assert!(s.insert(parse_kebab_name("[static]b.b")));
}
}