mirror of https://git.sr.ht/~garritfra/sabre
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133 lines
4.4 KiB
133 lines
4.4 KiB
3 years ago
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use crate::generator;
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use crate::lexer;
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use crate::parser;
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use crate::Lib;
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use crate::PathBuf;
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use parser::node_type::Module;
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use std::env;
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/**
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* Copyright 2021 Garrit Franke
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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use std::fs::File;
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use std::io::Read;
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use std::io::Write;
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pub struct Builder {
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in_file: PathBuf,
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modules: Vec<Module>,
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}
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impl Builder {
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pub fn new(entrypoint: PathBuf) -> Self {
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Self {
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in_file: entrypoint,
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modules: Vec::new(),
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}
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}
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fn get_base_path(&self) -> Result<PathBuf, String> {
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Ok(self
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.in_file
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.parent()
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.ok_or("File does not have a parent")?
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.to_path_buf())
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}
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pub fn build(&mut self) -> Result<(), String> {
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let in_file = self.in_file.clone();
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// Resolve path deltas between working directory and entrypoint
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let base_directory = self.get_base_path()?;
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if let Ok(resolved_delta) = in_file.strip_prefix(&base_directory) {
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// TODO: This error could probably be handled better
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let _ = env::set_current_dir(base_directory);
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self.in_file = resolved_delta.to_path_buf();
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}
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self.build_module(self.in_file.clone())?;
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// Append standard library
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self.build_stdlib();
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Ok(())
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}
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fn build_module(&mut self, file_path: PathBuf) -> Result<Module, String> {
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// TODO: This method can probably cleaned up quite a bit
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// In case the module is a directory, we have to append the filename of the entrypoint
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let resolved_file_path = if file_path.is_dir() {
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file_path.join("module.sb")
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} else {
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file_path
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};
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let mut file = File::open(&resolved_file_path)
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.map_err(|_| format!("Could not open file: {}", resolved_file_path.display()))?;
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let mut contents = String::new();
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file.read_to_string(&mut contents)
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.expect("Could not read file");
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let tokens = lexer::tokenize(&contents);
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let module = parser::parse(
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tokens,
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Some(contents),
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resolved_file_path.display().to_string(),
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)?;
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for import in &module.imports {
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// Build module relative to the current file
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let mut import_path = resolved_file_path
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.parent()
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.unwrap()
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.join(PathBuf::from(import));
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if import_path.is_dir() {
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import_path = import_path.join("module.sb");
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} else if !import_path.ends_with(".sb") {
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import_path.set_extension("sb");
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}
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self.build_module(import_path)?;
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}
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self.modules.push(module.clone());
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Ok(module)
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}
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pub(crate) fn generate(&mut self, out_file: PathBuf) -> Result<(), String> {
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let mut mod_iter = self.modules.iter();
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// TODO: We shouldn't clone here
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let mut condensed = mod_iter.next().ok_or("No module specified")?.clone();
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for module in mod_iter {
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condensed.merge_with(module.clone());
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}
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let output = generator::generate(condensed);
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let mut file = std::fs::File::create(out_file).expect("create failed");
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file.write_all(output.as_bytes()).expect("write failed");
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file.flush().map_err(|_| "Could not flush file".into())
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}
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fn build_stdlib(&mut self) {
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let assets = Lib::iter();
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for file in assets {
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let stdlib_raw =
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Lib::get(&file).expect("Standard library not found. This should not occur.");
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let stblib_str =
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std::str::from_utf8(&stdlib_raw).expect("Could not interpret standard library.");
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let stdlib_tokens = lexer::tokenize(&stblib_str);
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let module = parser::parse(stdlib_tokens, Some(stblib_str.into()), file.to_string())
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.expect("Could not parse stdlib");
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self.modules.push(module);
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}
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}
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}
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