127 lines
3.4 KiB
Rust
127 lines
3.4 KiB
Rust
use crate::parsing::ParseError;
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use crate::schala::{SourceReference, Stage};
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use crate::tokenizing::{Location, Token, TokenKind};
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use crate::symbol_table::SymbolError;
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use crate::typechecking::TypeError;
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pub struct SchalaError {
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errors: Vec<Error>,
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//TODO unify these sometime
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formatted_parse_error: Option<String>,
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}
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impl SchalaError {
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pub(crate) fn display(&self) -> String {
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if let Some(ref err) = self.formatted_parse_error {
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err.clone()
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} else {
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self.errors[0].text.as_ref().cloned().unwrap_or_default()
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}
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}
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pub(crate) fn from_type_error(err: TypeError) -> Self {
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Self {
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formatted_parse_error: None,
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errors: vec![Error {
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location: None,
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text: Some(err.msg),
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stage: Stage::Typechecking,
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}],
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}
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}
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pub(crate) fn from_symbol_table(symbol_errs: Vec<SymbolError>) -> Self {
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//TODO this could be better
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let errors = symbol_errs.into_iter().map(|_symbol_err| Error {
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location: None,
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text: Some("symbol table error".to_string()),
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stage: Stage::Symbols
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}).collect();
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Self {
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errors,
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formatted_parse_error: None
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}
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}
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pub(crate) fn from_string(text: String, stage: Stage) -> Self {
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Self {
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formatted_parse_error: None,
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errors: vec![Error {
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location: None,
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text: Some(text),
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stage,
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}],
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}
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}
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pub(crate) fn from_parse_error(
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parse_error: ParseError,
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source_reference: &SourceReference,
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) -> Self {
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Self {
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formatted_parse_error: Some(format_parse_error(parse_error, source_reference)),
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errors: vec![],
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}
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}
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pub(crate) fn from_tokens(tokens: &[Token]) -> Option<SchalaError> {
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let token_errors: Vec<Error> = tokens
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.iter()
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.filter_map(|tok| match tok.kind {
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TokenKind::Error(ref err) => Some(Error {
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location: Some(tok.location),
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text: Some(err.clone()),
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stage: Stage::Tokenizing,
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}),
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_ => None,
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})
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.collect();
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if token_errors.is_empty() {
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None
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} else {
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Some(SchalaError {
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errors: token_errors,
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formatted_parse_error: None,
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})
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}
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}
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}
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#[allow(dead_code)]
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struct Error {
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location: Option<Location>,
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text: Option<String>,
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stage: Stage,
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}
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fn format_parse_error(error: ParseError, source_reference: &SourceReference) -> String {
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let line_num = error.token.location.line_num;
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let ch = error.token.location.char_num;
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let line_from_program = source_reference.get_line(line_num as usize);
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let location_pointer = format!("{}^", " ".repeat(ch.into()));
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let line_num_digits = format!("{}", line_num).chars().count();
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let space_padding = " ".repeat(line_num_digits);
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let production = match error.production_name {
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Some(n) => format!("\n(from production \"{}\")", n),
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None => "".to_string(),
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};
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format!(
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r#"
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{error_msg}{production}
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{space_padding} |
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{line_num} | {}
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{space_padding} | {}
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"#,
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line_from_program,
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location_pointer,
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error_msg = error.msg,
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space_padding = space_padding,
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line_num = line_num,
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production = production
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)
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}
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