ironwork_exec/
loader.rs

1//! The interpreter's program loader: the programs CALL can reach, read from source and compiled
2//! the first time one is called.
3
4use crate::oo::ClassCode;
5use crate::unit::{LoadError, LoadedProgram, Loader, RunUnit};
6use crate::Compiled;
7use rt::unit::FoundClass;
8use std::path::PathBuf;
9use std::rc::Rc;
10use syntax::ast::Program;
11use syntax::copy;
12
13/// Where CALL finds programs: the other programs of the first program's source, then program
14/// libraries searched by member name.
15#[derive(Clone, Debug, Default)]
16pub struct Library {
17    pub programs: Vec<Program>,
18    pub dirs: Vec<PathBuf>,
19    pub copy: copy::Libraries,
20    pub flags: Vec<String>,
21}
22
23fn member_name(name: &str) -> bool {
24    !name.is_empty() && name.len() <= 30 && name.chars().all(|c| c.is_ascii_alphanumeric() || c == '-' || c == '_' || c == '@' || c == '#' || c == '$')
25}
26
27impl Library {
28    fn search(&mut self, name: &str) -> Result<(Program, PathBuf), LoadError> {
29        let candidates = [name.to_owned(), name.to_ascii_lowercase()];
30        let path = self
31            .dirs
32            .iter()
33            .flat_map(|d| candidates.iter().flat_map(move |n| ["", ".cbl", ".CBL", ".cob", ".COB"].iter().map(move |e| d.join(format!("{n}{e}")))))
34            .find(|p| p.is_file())
35            .ok_or(LoadError::NotFound)?;
36        let text = std::fs::read(&path).map(|b| copy::decode(&b)).map_err(|e| LoadError::Compile(format!("{}: {e}", path.display())))?;
37        let mut programs = syntax::parse_all_with(&text, &self.copy.with_program(&path))
38            .map_err(|e| LoadError::Compile(format!("{name} does not compile: {}", e.place(&path.display().to_string()))))?;
39        let first = programs.remove(0);
40        self.programs.extend(programs);
41        Ok((first, path))
42    }
43}
44
45impl Loader<Rc<Compiled>> for Library {
46    type Class = Rc<ClassCode>;
47
48    fn program(&mut self, name: &str) -> Result<LoadedProgram<Rc<Compiled>>, LoadError> {
49        if !member_name(name) {
50            return Err(LoadError::NotFound);
51        }
52        let (program, source) = match self.programs.iter().position(|p| p.id.eq_ignore_ascii_case(name)) {
53            Some(i) => (self.programs.remove(i), None),
54            None => self.search(name).map(|(p, path)| (p, Some(path)))?,
55        };
56        let compiled = crate::compile(program, &self.flags).map_err(|errors| {
57            let first = syntax::most_severe(&errors).map(|e| e.place(name)).unwrap_or_default();
58            LoadError::Compile(format!("{name} does not compile: {first}"))
59        })?;
60        let compiled = Rc::new(compiled);
61        let (files, size) = Self::shape(&compiled);
62        Ok(LoadedProgram { name: compiled.program.id.to_ascii_uppercase(), files, size, source, compiled })
63    }
64
65    fn holder(&self, entry: &str) -> Option<String> {
66        self.programs.iter().find(|p| crate::entry_points(p).iter().any(|e| e.name == entry)).map(|p| p.id.to_ascii_uppercase())
67    }
68
69    fn entry(program: &Rc<Compiled>, name: &str) -> Option<usize> {
70        program.entries.iter().position(|e| e.name == name)
71    }
72
73    fn shape(program: &Rc<Compiled>) -> (usize, usize) {
74        (program.program.files.len(), program.layout.size as usize)
75    }
76
77    fn class(&mut self, external: &str) -> Result<Option<FoundClass<Rc<ClassCode>>>, String> {
78        let Some((program, path)) = crate::oo::find_class(self, external)? else { return Ok(None) };
79        let at = crate::compile_time().map_err(|m| format!("class {external} does not compile: {m}"))?;
80        let (code, _) = crate::oo::class_code(&program, &self.flags, at).map_err(|errors| {
81            let first = syntax::most_severe(&errors).map(|e| e.place(external)).unwrap_or_default();
82            format!("class {external} does not compile: {first}")
83        })?;
84        let mut sources = program.sources;
85        if let (Some(own), Some(path)) = (sources.first_mut(), path) {
86            *own = path;
87        }
88        Ok(Some(FoundClass { code: Rc::new(code), sources }))
89    }
90}
91
92/// Adding a program to the interpreter's run unit by its source's PROGRAM-ID and FILE-CONTROL.
93pub trait AddProgram {
94    fn add(&mut self, compiled: Option<Rc<Compiled>>, program: &Program, size: usize) -> usize;
95}
96
97impl AddProgram for RunUnit<'_> {
98    fn add(&mut self, compiled: Option<Rc<Compiled>>, program: &Program, size: usize) -> usize {
99        self.add_named(compiled, program.id.to_ascii_uppercase(), program.files.len(), size)
100    }
101}
ironwork_exec/loader.rs

ironwork_exec/
loader.rs
