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feat: lexer implements ErrorConfig for improved error messages

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This commit is contained in:
Guy C 2025-02-04 03:02:37 +00:00
parent 3aae08ffd4
commit 5016fefc14
1 changed files with 33 additions and 1 deletions
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34
src/main/wacc/lexer.scala
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@ -4,7 +4,39 @@ import parsley.Parsley
import parsley.character
import parsley.token.{Basic, Lexer}
import parsley.token.descriptions.*
import parsley.token.errors._
import parsley.errors._
val errConfig = new ErrorConfig {
override def labelSymbol = Map(
"!=" -> Label("binary operator"),
"%" -> Label("binary operator"),
"&&" -> Label("binary operator"),
"*" -> Label("binary operator"),
"+" -> Label("binary operator"),
"-" -> Label("binary operator"),
"/" -> Label("binary operator"),
"<" -> Label("binary operator"),
"<=" -> Label("binary operator"),
"==" -> Label("binary operator"),
">" -> Label("binary operator"),
">=" -> Label("binary operator"),
"||" -> Label("binary operator"),
"!" -> Label("unary operator"),
"len" -> Label("unary operator"),
"ord" -> Label("unary operator"),
"chr" -> Label("unary operator"),
"bool" -> Label("valid type"),
"char" -> Label("valid type"),
"int" -> Label("valid type"),
"pair" -> Label("valid type"),
"string" -> Label("valid type"),
"fst" -> Label("pair extraction"),
"snd" -> Label("pair extraction"),
"false" -> Label("boolean value"),
"true" -> Label("boolean value")
)
}
object lexer {
private val desc = LexicalDesc.plain.copy(
nameDesc = NameDesc.plain.copy(
@ -43,7 +75,7 @@ object lexer {
)
)
private val lexer = Lexer(desc)
private val lexer = Lexer(desc, errConfig)
val ident = lexer.lexeme.names.identifier
val integer = lexer.lexeme.integer.decimal32[Int]
val negateCheck = lexer.nonlexeme.symbol("-") ~> character.digit