schala/schala-lang/language/src/lib.rs

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#![feature(trace_macros)]
#![feature(custom_attribute)]
//#![feature(unrestricted_attribute_tokens)]
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#![feature(slice_patterns, box_patterns, box_syntax)]
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//! `schala-lang` is where the Schala programming language is actually implemented.
//! It defines the `Schala` type, which contains the state for a Schala REPL, and implements
//! `ProgrammingLanguageInterface` and the chain of compiler passes for it.
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extern crate itertools;
#[macro_use]
extern crate lazy_static;
#[macro_use]
extern crate maplit;
extern crate schala_repl;
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#[macro_use]
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extern crate schala_lang_codegen;
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extern crate ena;
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use stopwatch::Stopwatch;
use std::cell::RefCell;
use std::rc::Rc;
use itertools::Itertools;
use schala_repl::{ProgrammingLanguageInterface,
ComputationRequest, ComputationResponse,
LangMetaRequest, LangMetaResponse, GlobalOutputStats,
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DebugResponse, DebugAsk};
macro_rules! bx {
($e:expr) => { Box::new($e) }
}
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#[macro_use]
mod util;
#[macro_use]
mod typechecking;
mod tokenizing;
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mod ast;
mod parsing;
mod symbol_table;
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mod builtin;
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mod reduced_ast;
mod eval;
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/// All bits of state necessary to parse and execute a Schala program are stored in this struct.
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/// `state` represents the execution state for the AST-walking interpreter, the other fields
/// should be self-explanatory.
pub struct Schala {
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source_reference: SourceReference,
state: eval::State<'static>,
symbol_table: Rc<RefCell<symbol_table::SymbolTable>>,
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type_context: typechecking::TypeContext<'static>,
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active_parser: Option<parsing::Parser>,
}
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impl Schala {
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fn handle_docs(&self, source: String) -> LangMetaResponse {
LangMetaResponse::Docs {
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doc_string: format!("Schala item `{}` : <<Schala-lang documentation not yet implemented>>", source)
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}
}
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}
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impl Schala {
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/// Creates a new Schala environment *without* any prelude.
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fn new_blank_env() -> Schala {
let symbols = Rc::new(RefCell::new(symbol_table::SymbolTable::new()));
Schala {
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source_reference: SourceReference::new(),
symbol_table: symbols.clone(),
state: eval::State::new(symbols),
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type_context: typechecking::TypeContext::new(),
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active_parser: None,
}
}
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/// Creates a new Schala environment with the standard prelude, which is defined as ordinary
/// Schala code in the file `prelude.schala`
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pub fn new() -> Schala {
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let prelude = include_str!("prelude.schala");
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let mut s = Schala::new_blank_env();
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let request = ComputationRequest { source: prelude, debug_requests: vec![] };
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s.run_computation(request);
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s
}
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fn handle_debug_immediate(&self, request: DebugAsk) -> DebugResponse {
use DebugAsk::*;
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match request {
Timing => DebugResponse { ask: Timing, value: format!("Invalid") },
ByStage { stage_name } => match &stage_name[..] {
"symbol-table" => {
let value = self.symbol_table.borrow().debug_symbol_table();
DebugResponse {
ask: ByStage { stage_name: format!("symbol-table") },
value
}
},
s => {
DebugResponse {
ask: ByStage { stage_name: s.to_string() },
value: format!("Not-implemented")
}
}
}
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}
}
}
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fn tokenizing(input: &str, _handle: &mut Schala, comp: Option<&mut PassDebugArtifact>) -> Result<Vec<tokenizing::Token>, String> {
let tokens = tokenizing::tokenize(input);
comp.map(|comp| {
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let token_string = tokens.iter().map(|t| t.to_string_with_metadata()).join(", ");
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comp.add_artifact(token_string);
});
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let errors: Vec<String> = tokens.iter().filter_map(|t| t.get_error()).collect();
if errors.len() == 0 {
Ok(tokens)
} else {
Err(format!("{:?}", errors))
}
}
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fn parsing(input: Vec<tokenizing::Token>, handle: &mut Schala, comp: Option<&mut PassDebugArtifact>) -> Result<ast::AST, String> {
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use crate::parsing::Parser;
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let mut parser = match handle.active_parser.take() {
None => Parser::new(input),
Some(parser) => parser
};
let ast = parser.parse();
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let _trace = parser.format_parse_trace();
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comp.map(|_comp| {
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/*
//TODO need to control which of these debug stages get added
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let opt = comp.cur_debug_options.get(0).map(|s| s.clone());
match opt {
None => comp.add_artifact(TraceArtifact::new("ast", format!("{:?}", ast))),
Some(ref s) if s == "compact" => comp.add_artifact(TraceArtifact::new("ast", format!("{:?}", ast))),
Some(ref s) if s == "expanded" => comp.add_artifact(TraceArtifact::new("ast", format!("{:#?}", ast))),
Some(ref s) if s == "trace" => comp.add_artifact(TraceArtifact::new_parse_trace(trace)),
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Some(ref x) => println!("Bad parsing debug option: {}", x),
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};
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*/
});
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ast.map_err(|err| format_parse_error(err, handle))
}
fn format_parse_error(error: parsing::ParseError, handle: &mut Schala) -> String {
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let line_num = error.token.line_num;
let ch = error.token.char_num;
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let line_from_program = handle.source_reference.get_line(line_num);
let location_pointer = format!("{}^", " ".repeat(ch));
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let line_num_digits = format!("{}", line_num).chars().count();
let space_padding = " ".repeat(line_num_digits);
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format!(r#"
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{error_msg}
{space_padding} |
{line_num} | {}
{space_padding} | {}
"#, line_from_program, location_pointer, error_msg=error.msg, space_padding=space_padding, line_num=line_num)
}
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fn symbol_table(input: ast::AST, handle: &mut Schala, comp: Option<&mut PassDebugArtifact>) -> Result<ast::AST, String> {
let add = handle.symbol_table.borrow_mut().add_top_level_symbols(&input);
match add {
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Ok(()) => {
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let debug = handle.symbol_table.borrow().debug_symbol_table();
comp.map(|comp| comp.add_artifact(debug));
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Ok(input)
},
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Err(msg) => Err(msg)
}
}
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fn typechecking(input: ast::AST, handle: &mut Schala, comp: Option<&mut PassDebugArtifact>) -> Result<ast::AST, String> {
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let result = handle.type_context.typecheck(&input);
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comp.map(|comp| {
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comp.add_artifact(match result {
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Ok(ty) => ty.to_string(),
Err(err) => format!("Type error: {}", err.msg)
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});
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});
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Ok(input)
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}
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fn ast_reducing(input: ast::AST, handle: &mut Schala, comp: Option<&mut PassDebugArtifact>) -> Result<reduced_ast::ReducedAST, String> {
let ref symbol_table = handle.symbol_table.borrow();
let output = input.reduce(symbol_table);
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comp.map(|comp| comp.add_artifact(format!("{:?}", output)));
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Ok(output)
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}
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fn eval(input: reduced_ast::ReducedAST, handle: &mut Schala, comp: Option<&mut PassDebugArtifact>) -> Result<String, String> {
comp.map(|comp| comp.add_artifact(handle.state.debug_print()));
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let evaluation_outputs = handle.state.evaluate(input, true);
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let text_output: Result<Vec<String>, String> = evaluation_outputs
.into_iter()
.collect();
let eval_output: Result<String, String> = text_output
.map(|v| { v.into_iter().intersperse(format!("\n")).collect() });
eval_output
}
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/// Represents lines of source code
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struct SourceReference {
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lines: Option<Vec<String>>
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}
impl SourceReference {
fn new() -> SourceReference {
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SourceReference { lines: None }
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}
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fn load_new_source(&mut self, source: &str) {
//TODO this is a lot of heap allocations - maybe there's a way to make it more efficient?
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self.lines = Some(source.lines().map(|s| s.to_string()).collect()); }
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fn get_line(&self, line: usize) -> String {
self.lines.as_ref().and_then(|x| x.get(line).map(|s| s.to_string())).unwrap_or(format!("NO LINE FOUND"))
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}
}
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struct PassDebugArtifact {
artifact: Option<String>
}
impl PassDebugArtifact {
fn add_artifact(&mut self, artifact: String) {
self.artifact = Some(artifact)
}
}
impl ProgrammingLanguageInterface for Schala {
fn get_language_name(&self) -> String { format!("Schala") }
fn get_source_file_suffix(&self) -> String { format!("schala") }
fn run_computation(&mut self, request: ComputationRequest) -> ComputationResponse {
let ComputationRequest { source, debug_requests } = request;
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self.source_reference.load_new_source(source);
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let token_debug_artifact = None;
let parsing_debug_artifact = None;
let symbol_debug_artifact = None;
let typechecking_debug_artifact = None;
let reducing_debug_artifact = None;
let eval_debug_artifact = None;
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let sw = Stopwatch::start_new();
let main_output: Result<String, String> = tokenizing(source, self, token_debug_artifact)
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.and_then(|tokens| parsing(tokens, self, parsing_debug_artifact))
.and_then(|ast| symbol_table(ast, self, symbol_debug_artifact))
.and_then(|ast| typechecking(ast, self, typechecking_debug_artifact))
.and_then(|ast| ast_reducing(ast, self, reducing_debug_artifact))
.and_then(|reduced_ast| eval(reduced_ast, self, eval_debug_artifact));
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let total_duration = sw.elapsed();
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let global_output_stats = GlobalOutputStats {
total_duration, stage_durations: None,
};
ComputationResponse {
main_output,
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global_output_stats,
debug_responses: vec![],
}
}
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fn request_meta(&mut self, request: LangMetaRequest) -> LangMetaResponse {
match request {
LangMetaRequest::StageNames => LangMetaResponse::StageNames(
vec!["tokenizing".into(), "parsing".into(), "typechecking".into(), "symbol-table".into(),
"ast-reduction".into(), "ast-walking-evaluation".into()]
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),
LangMetaRequest::Docs { source } => self.handle_docs(source),
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LangMetaRequest::ImmediateDebug(debug_request) =>
LangMetaResponse::ImmediateDebug(self.handle_debug_immediate(debug_request)),
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LangMetaRequest::Custom { .. } => LangMetaResponse::Custom { kind: format!("not-implemented"), value: format!("") }
}
}
}