schala/schala-lang/src/lib.rs

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#![feature(slice_patterns, box_patterns, box_syntax)]
#![feature(proc_macro)]
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extern crate itertools;
#[macro_use]
extern crate lazy_static;
#[macro_use]
extern crate maplit;
#[macro_use]
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extern crate schala_repl;
extern crate schala_codegen;
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use itertools::Itertools;
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use schala_repl::{ProgrammingLanguageInterface, EvalOptions, TraceArtifact, UnfinishedComputation, FinishedComputation};
macro_rules! bx {
($e:expr) => { Box::new($e) }
}
mod builtin;
mod tokenizing;
mod parsing;
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mod typechecking;
mod eval;
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use self::typechecking::{TypeContext};
pub struct Schala {
state: eval::State<'static>,
type_context: TypeContext
}
impl Schala {
pub fn new() -> Schala {
Schala {
state: eval::State::new(),
type_context: TypeContext::new(),
}
}
}
fn tokenizing_stage(_handle: &mut Schala, input: &str, comp: Option<&mut UnfinishedComputation>) -> Result<Vec<tokenizing::Token>, ()> {
let tokens = tokenizing::tokenize(input);
comp.map(|comp| {
let token_string = tokens.iter().map(|t| format!("{:?}<L:{},C:{}>", t.token_type, t.offset.0, t.offset.1)).join(", ");
comp.add_artifact(TraceArtifact::new("tokens", token_string));
});
Ok(tokenizing::tokenize(input))
}
fn parsing_stage(_handle: &mut Schala, input: Vec<tokenizing::Token>, comp: Option<&mut UnfinishedComputation>) -> Result<parsing::AST, parsing::ParseError> {
let (ast, trace) = parsing::parse(input);
comp.map(|comp| {
//TODO need to control which of these debug stages get added
comp.add_artifact(TraceArtifact::new_parse_trace(trace));
comp.add_artifact(TraceArtifact::new("ast", format!("{:#?}", ast)));
});
ast
}
fn symbol_table_stage(handle: &mut Schala, input: parsing::AST, comp: Option<&mut UnfinishedComputation>) -> Result<parsing::AST, String> {
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match handle.type_context.add_top_level_types(&input) {
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Ok(()) => {
let text = handle.type_context.debug_symbol_table();
comp.map(|comp| comp.add_artifact(TraceArtifact::new("symbol_table", text)));
Ok(input)
},
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Err(msg) => Err(msg)
}
}
fn typechecking_stage(handle: &mut Schala, input: parsing::AST, comp: Option<&mut UnfinishedComputation>) -> Result<parsing::AST, String> {
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match handle.type_context.type_check_ast(&input) {
Ok(ty) => {
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comp.map(|comp| comp.add_artifact(TraceArtifact::new("type_check", format!("{:?}", ty))));
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Ok(input)
},
Err(msg) => Err(msg)
}
}
fn eval_stage(handle: &mut Schala, input: parsing::AST, comp: Option<&mut UnfinishedComputation>) -> Result<String, String> {
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let evaluation_outputs = handle.state.evaluate(input);
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
}
impl ProgrammingLanguageInterface for Schala {
fn get_language_name(&self) -> String {
"Schala".to_string()
}
fn get_source_file_suffix(&self) -> String {
format!("schala")
}
fn execute_pipeline(&mut self, input: &str, options: &EvalOptions) -> FinishedComputation {
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let mut chain = pass_chain![self, options;
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tokenizing_stage,
parsing_stage,
symbol_table_stage,
typechecking_stage,
eval_stage
];
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chain(input)
}
}