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44 lines
1.5 KiB
44 lines
1.5 KiB
use sexp::SourcePosition;
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use crate::asm::error::CrsnError;
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use crate::asm::instr::cond::parse_cond;
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use crate::asm::instr::Op;
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use crate::asm::parse::arg_parser::TokenParser;
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use crate::module::ParseRes;
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pub fn parse_op<'a>(mut keyword: &str, mut arg_tokens: TokenParser<'a>, spos: &SourcePosition) -> Result<Option<Op>, CrsnError> {
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// Include built-in instructions
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let mut cond = None;
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if let Some(pos) = keyword.find('.') {
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cond = Some(parse_cond(&keyword[(pos + 1)..], spos)?);
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keyword = &keyword[..pos];
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}
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if cond.is_some() && arg_tokens.pcx.state.borrow().parsing_expr {
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return Err(CrsnError::Parse("Conditional suffixes are not allowed in const expression".into(), spos.clone()));
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}
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for p in arg_tokens.pcx.parsers {
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arg_tokens = match p.parse_op(spos, keyword, arg_tokens) {
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Ok(ParseRes::Parsed(kind)) => return Ok(Some(Op {
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cond,
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pos: spos.clone(),
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kind,
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})),
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Ok(ParseRes::ParsedNone) => return Ok(None),
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Ok(ParseRes::Unknown(to_reuse)) => {
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if to_reuse.parsing_started() {
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return Err(CrsnError::Parse(format!("Module \"{}\" started parsing {}, but returned Unknown!", p.name(), keyword).into(), spos.clone()));
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}
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to_reuse
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}
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Err(err) => {
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return Err(err);
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}
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}
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}
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return Err(CrsnError::Parse(format!("Unknown instruction: {}", keyword).into(), spos.clone()));
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}
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