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use crate::*;
use std::collections::HashMap;
use std::path::PathBuf;
use SyntacticTokenVariant as SynVar;
use SemanticTokenVariant as SemVar;
use SemanticParseError as SemErr;
pub fn generate_semantic_tokens<P: Into<PathBuf>>(source_code: &str, path: Option<P>) -> Vec<SemanticToken> {
let semantic_parser = SemanticParser::from_source_code(source_code, path);
semantic_parser.parse()
}
/// Translate syntactic tokens into semantic tokens.
struct SemanticParser {
labels: HashMap<String, Definition>,
macros: HashMap<String, Definition>,
syntactic_tokens: Vec<SyntacticToken>,
/// Index of the current outer token.
current_outer_index: usize,
}
impl SemanticParser {
pub fn from_source_code<P: Into<PathBuf>>(source_code: &str, path: Option<P>) -> Self {
let mut labels = HashMap::new();
let mut macros = HashMap::new();
let mut syntactic_tokens = Vec::new();
let parser = SyntacticParser::from_source_code(source_code, path);
for syntactic_token in parser {
let definition = Definition::new(syntactic_token.source.clone());
match &syntactic_token.variant {
SynVar::LabelDefinition(name) => {
let _ = labels.try_insert(name.to_owned(), definition);
},
SynVar::MacroDefinition(name) => {
let _ = macros.try_insert(name.to_owned(), definition);
},
_ => (),
}
syntactic_tokens.push(syntactic_token);
}
Self {
labels,
macros,
syntactic_tokens,
current_outer_index: 0,
}
}
/// Parse syntactic tokens as semantic tokens.
pub fn parse(mut self) -> Vec<SemanticToken> {
let syntactic_tokens = std::mem::take(&mut self.syntactic_tokens);
let mut syntactic = syntactic_tokens.into_iter();
let mut semantic_tokens = self.pull_semantic_tokens(&mut syntactic, false);
// Insert real label definition pointers into label reference tokens.
for definition in self.labels.values_mut() {
if let Some(definition_pointer) = definition.pointer {
// Insert definition pointer into reference tokens.
for reference_pointer in &definition.references {
let reference_token = &mut semantic_tokens[*reference_pointer];
reference_token.variant = SemVar::LabelReference(definition_pointer);
}
// Insert reference pointers into definition token.
let definition_token = &mut semantic_tokens[definition_pointer];
if let SemVar::LabelDefinition(ref mut def) = definition_token.variant {
def.references = std::mem::take(&mut definition.references);
} else { unreachable!() }
// Insert definition pointer into reference tokens inside macros.
for (outer, inner) in &definition.deep_references {
let macro_token = &mut semantic_tokens[*outer];
if let SemVar::MacroDefinition(ref mut def) = macro_token.variant {
let reference_token = &mut def.body_tokens[*inner];
reference_token.variant = SemVar::LabelReference(definition_pointer);
} else { unreachable!() }
}
// TODO: Record deep references in macro and label definitions?
}
}
return semantic_tokens;
}
fn pull_semantic_tokens<I>(&mut self, parser: &mut I, in_macro: bool) -> Vec<SemanticToken>
where I: Iterator<Item = SyntacticToken>
{
let mut semantic_tokens: Vec<SemanticToken> = Vec::new();
let mut block_stack: Vec<usize> = Vec::new();
while let Some(syntactic_token) = parser.next() {
let current_index = semantic_tokens.len();
if !in_macro {
self.current_outer_index = current_index;
}
let semantic_token_variant = match syntactic_token.variant {
SynVar::LabelDefinition(name) => {
if in_macro {
SemVar::Error(SemErr::LabelDefinitionInMacroDefinition)
} else if let Some(definition) = self.macros.get(&name) {
let source = definition.source.clone();
SemVar::Error(SemErr::RedefinedSymbol((name, source)))
} else if let Some(definition) = self.labels.get_mut(&name) {
if definition.pointer.is_some() {
let source = definition.source.clone();
SemVar::Error(SemErr::RedefinedSymbol((name, source)))
} else {
definition.pointer = Some(current_index);
let references = Vec::new();
SemVar::LabelDefinition(LabelDefinition { name, references })
}
} else {
unreachable!()
}
}
SynVar::MacroDefinition(name) => {
if in_macro {
SemVar::Error(SemErr::MacroDefinitionInMacroDefinition)
} else if let Some(definition) = self.labels.get(&name) {
let source = definition.source.clone();
SemVar::Error(SemErr::RedefinedSymbol((name, source)))
} else if let Some(definition) = self.macros.get_mut(&name) {
if definition.pointer.is_some() {
let source = definition.source.clone();
SemVar::Error(SemErr::RedefinedSymbol((name, source)))
} else {
definition.pointer = Some(current_index);
let references = Vec::new();
let body_tokens = self.pull_semantic_tokens(parser, true);
SemVar::MacroDefinition(MacroDefinition { name, references, body_tokens })
}
} else {
unreachable!()
}
}
SynVar::MacroDefinitionTerminator => if in_macro {
break;
} else {
SemVar::Error(SemErr::StrayMacroTerminator)
}
SynVar::Literal(value) => {
SemVar::Literal(value)
}
SynVar::Padding(value) => {
SemVar::Padding(value)
}
SynVar::Instruction(instr) => {
SemVar::Instruction(instr)
}
SynVar::Comment(comment) => {
SemVar::Comment(comment)
}
SynVar::String(bytes) => {
SemVar::String(bytes)
}
SynVar::BlockOpen => {
block_stack.push(current_index);
SemVar::BlockOpen(0)
}
SynVar::BlockClose => {
if let Some(pointer) = block_stack.pop() {
let open = &mut semantic_tokens[pointer];
open.variant = SemVar::BlockOpen(current_index);
SemVar::BlockClose(pointer)
} else {
SemVar::Error(SemErr::StrayBlockClose)
}
}
SynVar::MarkOpen => {
SemVar::MarkOpen
}
SynVar::MarkClose => {
SemVar::MarkClose
}
SynVar::Symbol(name) => {
if let Some(definition) = self.labels.get_mut(&name) {
if in_macro {
let pointer = (self.current_outer_index, current_index);
definition.deep_references.push(pointer);
} else {
definition.references.push(current_index);
}
SemVar::LabelReference(0)
} else if let Some(definition) = self.macros.get_mut(&name) {
if let Some(pointer) = definition.pointer {
if !in_macro { definition.references.push(current_index); }
SemVar::MacroInvocation(pointer)
} else {
let source = definition.source.clone();
SemVar::Error(SemErr::MacroInvocationBeforeDefinition((name, source)))
}
} else {
SemVar::Error(SemErr::UndefinedSymbol(name))
}
}
SynVar::Error(syntax_err) => {
SemVar::Error(SemErr::SyntaxError(syntax_err))
}
};
let semantic_token = SemanticToken {
source: syntactic_token.source,
bytecode: BytecodeSpan::default(),
variant: semantic_token_variant,
};
semantic_tokens.push(semantic_token);
}
if in_macro {
//TODO: UnterminatedMacroDefinition
}
// Replace each unclosed BlockOpen token with an error.
for block_pointer in block_stack {
semantic_tokens[block_pointer].variant = SemVar::Error(SemErr::UnclosedBlock);
}
return semantic_tokens;
}
}
struct Definition {
pub source: SourceSpan,
pub pointer: Option<usize>,
pub references: Vec<usize>,
/// (macro index, label reference index)
pub deep_references: Vec<(usize, usize)>,
}
impl Definition {
pub fn new(source: SourceSpan) -> Self {
Self {
source,
pointer: None,
references: Vec::new(),
deep_references: Vec::new(),
}
}
}
|
