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53 lines
1.5 KiB
53 lines
1.5 KiB
use sexp::Sexp;
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use crate::asm::error::Error;
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use crate::asm::instr::Instr;
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use crate::asm::instr::op::AsmModule;
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use crate::asm::parse::arg_parser::ArgParser;
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use crate::asm::parse::parse_cond::parse_cond_branch;
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use crate::asm::parse::sexp_expect::{expect_list, expect_string_atom};
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use crate::asm::patches::SexpIsA;
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use super::parse_op::parse_op;
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pub fn parse_instructions(instrs: Vec<Sexp>, parsers: &[Box<dyn AsmModule>]) -> Result<Vec<Instr>, Error> {
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let mut parsed = vec![];
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for expr in instrs {
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let tokens = expect_list(Some(expr), false)?;
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let mut toki = tokens.into_iter();
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let mut name = expect_string_atom(toki.next())?;
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let far = if name == "far" {
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name = expect_string_atom(toki.next())?;
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true
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} else {
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false
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};
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let arg_tokens = ArgParser::new(toki.clone().take_while(|e| e.is_atom()).collect());
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let branch_tokens = toki
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.skip_while(|e| e.is_atom())
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.take_while(|e| e.is_list());
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let branches = {
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let mut branches = vec![];
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for t in branch_tokens {
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branches.push(parse_cond_branch(t, parsers)?);
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}
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if branches.is_empty() {
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None
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} else {
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Some(branches)
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}
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};
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parsed.push(Instr {
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op: parse_op(name.as_str(), far, arg_tokens, parsers)?,
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branches,
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});
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}
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Ok(parsed)
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}
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