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112 lines
3.1 KiB
112 lines
3.1 KiB
use sexp::{Sexp, SourcePosition};
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use crate::asm::data::{Mask, Rd, RdData, RdObj, Wr};
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use crate::asm::error::CrsnError;
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use crate::asm::parse::parse_data::{parse_rd, parse_wr};
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use crate::asm::parse::ParserContext;
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use crate::asm::parse::sexp_expect::expect_string_atom;
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/// Utility for argument parsing
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pub struct TokenParser<'a> {
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orig_len: usize,
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args: Vec<Sexp>,
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start_pos: &'a SourcePosition,
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pub pcx: &'a ParserContext<'a>,
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}
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impl<'a> IntoIterator for TokenParser<'a> {
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type Item = Sexp;
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type IntoIter = std::vec::IntoIter<Sexp>;
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fn into_iter(mut self) -> Self::IntoIter {
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// The vec is reversed so we can call "pop", but here we will iterate it as slice so it
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// must be reversed to its original direction.
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self.args.reverse();
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self.args.into_iter()
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}
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}
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impl<'a> TokenParser<'a> {
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/// Create a new argument parser
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pub fn new(mut args: Vec<Sexp>, start_pos: &'a SourcePosition, pcx: &'a ParserContext) -> Self {
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args.reverse();
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Self {
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orig_len: args.len(),
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start_pos,
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args,
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pcx,
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}
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}
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pub fn have_more(&self) -> bool {
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self.len() > 0
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}
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/// Get remaining items count
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pub fn len(&self) -> usize {
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self.args.len()
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}
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/// Get len before parsing started
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pub fn orig_len(&self) -> usize {
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self.orig_len
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}
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/// Check if parsing started
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pub fn parsing_started(&self) -> bool {
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self.args.len() != self.orig_len
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}
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/// Get the next entry
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pub fn next(&mut self) -> Option<Sexp> {
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self.args.pop()
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}
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/// Get the next entry, or raise an error
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pub fn next_or_err(&mut self) -> Result<Sexp, CrsnError> {
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match self.next() {
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None => {
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Err(CrsnError::Parse("Unexpected end of token list".into(), self.start_pos.clone()))
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}
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Some(removed) => Ok(removed)
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}
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}
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/// Look at the next entry
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pub fn peek(&mut self) -> Option<&Sexp> {
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self.args.last()
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}
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/// Get the next string entry
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pub fn next_string(&mut self) -> Result<(String, SourcePosition), CrsnError> {
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let next = self.next_or_err()?;
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let esa = expect_string_atom(next)?;
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Ok(esa)
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}
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/// Get the next entry as read location
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pub fn next_rd(&mut self) -> Result<Rd, CrsnError> {
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let next = self.next_or_err()?;
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parse_rd(next, self.pcx)
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}
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/// Get the next entry as an object location
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pub fn next_rdobj(&mut self) -> Result<RdObj, CrsnError> {
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match parse_rd(self.next_or_err()?, self.pcx)? {
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Rd(RdData::RegObject(reg), Mask::FULL) => {
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Ok(RdObj::new(reg))
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}
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other => {
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Err(CrsnError::Parse(
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format!("Not a valid object handle syntax: {:?}", other).into(),
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self.start_pos.clone(),
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))
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}
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}
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}
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/// Get the next entry as write location
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pub fn next_wr(&mut self) -> Result<Wr, CrsnError> {
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parse_wr(self.next_or_err()?, self.pcx)
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}
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}
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