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use std::ops::Range;
use crate::{
error::{ErrorInfo, SyntaxError},
lexer::{lex, Lexer, Parameters, Token},
parser::{
ast::{Component, ComponentType, Path, RawIdType},
string::{self, RawLiteral},
ParseState,
},
SyntaxResult,
};
fn is_path_component(lex: &Parameters) -> bool {
match lex {
Parameters::ExplicitThisKeyword
| Parameters::ExplicitThisDotSlash
| Parameters::ParentRef
| Parameters::Identifier
| Parameters::LocalIdentifier
| Parameters::PathDelimiter
| Parameters::StartArray
| Parameters::SingleQuoteString
| Parameters::DoubleQuoteString => true,
_ => false,
}
}
fn to_component<'source>(
source: &'source str,
state: &mut ParseState,
lex: &Parameters,
span: Range<usize>,
raw_id: Option<RawLiteral>,
) -> SyntaxResult<Component<'source>> {
let value = if let Some(ref raw) = raw_id {
if raw.has_escape_sequences() {
Some(raw.into_owned(&source[span.clone()]))
} else {
None
}
} else {
None
};
let kind = match &lex {
Parameters::ExplicitThisKeyword => ComponentType::ThisKeyword,
Parameters::ExplicitThisDotSlash => ComponentType::ThisDotSlash,
Parameters::ParentRef => ComponentType::Parent,
Parameters::Identifier => ComponentType::Identifier,
Parameters::LocalIdentifier => ComponentType::LocalIdentifier,
Parameters::PathDelimiter => ComponentType::Delimiter,
Parameters::SingleQuoteString => {
ComponentType::RawIdentifier(RawIdType::Single)
}
Parameters::DoubleQuoteString => {
ComponentType::RawIdentifier(RawIdType::Double)
}
Parameters::StartArray => {
ComponentType::RawIdentifier(RawIdType::Array)
}
_ => {
return Err(SyntaxError::ComponentType(
ErrorInfo::from((source, state)).into(),
))
}
};
Ok(Component::new(source, kind, span, value))
}
fn parents<'source>(
_state: &mut ParseState,
lexer: &mut Lexer<'source>,
path: &mut Path,
) -> Option<Token> {
path.set_parents(1);
while let Some(token) = lexer.next() {
match &token {
Token::Parameters(lex, _) => match &lex {
Parameters::ParentRef => {
path.set_parents(path.parents() + 1);
}
_ => return Some(token),
},
_ => return Some(token),
}
}
None
}
pub(crate) fn components<'source>(
source: &'source str,
state: &mut ParseState,
lexer: &mut Lexer<'source>,
path: &mut Path<'source>,
mut wants_delimiter: bool,
) -> SyntaxResult<Option<Token>> {
while let Some(token) = lexer.next() {
if token.is_newline() {
*state.line_mut() += 1;
// Paths are terminated if we hit a newline!
return Ok(lexer.next());
}
match token {
Token::Parameters(lex, mut span) => {
*state.byte_mut() = span.start;
let mut raw_id: Option<RawLiteral> = None;
if lex == Parameters::End {
return Ok(Some(Token::Parameters(lex, span)));
}
if is_path_component(&lex) {
path.span_mut().end = span.end;
match &lex {
Parameters::ExplicitThisKeyword
| Parameters::ExplicitThisDotSlash => {
*state.byte_mut() = span.start;
return Err(
SyntaxError::UnexpectedPathExplicitThis(
ErrorInfo::from((source, state)).into(),
),
);
}
Parameters::ParentRef => {
*state.byte_mut() = span.start;
return Err(SyntaxError::UnexpectedPathParent(
ErrorInfo::from((source, state)).into(),
));
}
Parameters::LocalIdentifier => {
*state.byte_mut() = span.start;
return Err(SyntaxError::UnexpectedPathLocal(
ErrorInfo::from((source, state)).into(),
));
}
Parameters::SingleQuoteString => {
// Override the span to the inner string value
let (inner, flags) = string::parse(
source,
lexer,
state,
(lex, span),
string::RawLiteralType::Single,
)?;
span = inner;
raw_id = Some(flags);
}
Parameters::DoubleQuoteString => {
// Override the span to the inner string value
let (inner, flags) = string::parse(
source,
lexer,
state,
(lex, span),
string::RawLiteralType::Double,
)?;
span = inner;
raw_id = Some(flags);
}
Parameters::StartArray => {
// Override the span to the inner string value
let (inner, flags) = string::parse(
source,
lexer,
state,
(lex, span),
string::RawLiteralType::Array,
)?;
span = inner;
raw_id = Some(flags);
}
_ => {}
}
if wants_delimiter {
match &lex {
Parameters::PathDelimiter => {
wants_delimiter = false;
continue;
}
_ => {
*state.byte_mut() = span.start;
return Err(
SyntaxError::ExpectedPathDelimiter(
ErrorInfo::from((source, state)).into(),
),
);
}
}
} else {
match &lex {
Parameters::PathDelimiter => {
*state.byte_mut() = span.start;
return Err(
SyntaxError::UnexpectedPathDelimiter(
ErrorInfo::from((source, state)).into(),
),
);
}
_ => {}
}
}
path.add_component(to_component(
source, state, &lex, span, raw_id,
)?);
wants_delimiter = true;
} else {
return Ok(Some(Token::Parameters(lex, span)));
}
}
_ => return Ok(Some(token)),
}
}
Ok(None)
}
pub(crate) fn parse<'source>(
source: &'source str,
lexer: &mut Lexer<'source>,
state: &mut ParseState,
current: (Parameters, Range<usize>),
) -> SyntaxResult<(Option<Path<'source>>, Option<Token>)> {
let (lex, span) = current;
let mut path = Path::new(source, span.clone(), state.line_range());
let initial = &source[span.start..span.end];
let mut next: Option<Token> = Some(Token::Parameters(lex, span));
match &lex {
// Cannot start with a path delimiter
Parameters::PathDelimiter => {
if initial == "/" {
path.set_absolute(true);
next = lexer.next();
} else {
return Err(SyntaxError::UnexpectedPathDelimiter(
ErrorInfo::from((source, state)).into(),
));
}
}
// Count parent references
Parameters::ParentRef => {
next = parents(state, lexer, &mut path);
}
_ => {}
}
while let Some(token) = next {
match token {
Token::Parameters(lex, span) => {
*state.byte_mut() = span.start;
if is_path_component(&lex) {
path.span_mut().end = span.end;
let component =
to_component(source, state, &lex, span, None)?;
// Flag as a path that should be resolved from the root object
if path.is_empty() && component.is_root() {
path.set_root(true);
}
if component.is_explicit() {
path.set_explicit(true);
}
if component.is_local() && path.parents() > 0 {
return Err(
SyntaxError::UnexpectedPathParentWithLocal(
ErrorInfo::from((source, state)).into(),
),
);
}
if component.is_explicit() && path.parents() > 0 {
return Err(
SyntaxError::UnexpectedPathParentWithExplicit(
ErrorInfo::from((source, state)).into(),
),
);
}
let wants_delimiter = !component.is_explicit_dot_slash();
path.add_component(component);
let next = components(
source,
state,
lexer,
&mut path,
wants_delimiter,
)?;
if path.is_empty() {
return Err(SyntaxError::EmptyPath(
ErrorInfo::from((source, state)).into(),
));
}
return Ok((Some(path), next));
}
}
_ => {
return Err(SyntaxError::TokenParameterPath(
ErrorInfo::from((source, state)).into(),
))
}
}
next = lexer.next();
}
Ok((None, next))
}
pub(crate) fn from_str<'source>(
source: &'source str,
) -> SyntaxResult<Option<Path<'source>>> {
let mut lexer = lex(source);
lexer.set_parameters_mode();
let mut state: ParseState = ParseState::new();
if let Some(token) = lexer.next() {
match token {
Token::Parameters(lex, span) => {
let (path, _) =
parse(source, &mut lexer, &mut state, (lex, span))?;
return Ok(path);
}
_ => {
return Err(SyntaxError::TokenParameterPath(
ErrorInfo::from((source, &mut state)).into(),
))
}
}
}
Ok(None)
}