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Ignored tokens parsing (WIP) #14

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33 changes: 33 additions & 0 deletions src/commonTest/kotlin/me/alllex/parsus/Tests.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -570,12 +570,45 @@ class Tests {
}
}

@Test
fun forceIgnoredTokenParsing() {
object : Grammar<SyntaxTree>() {
val ws by regexToken("\\s+", ignored = true)
val a by literalToken("a")
override val root by parser {
val a1 = lexeme(a)
ws()
val a2 = lexeme(a)
node(a1, a2)
}
}.run {
assertParsed("a a").isEqualTo(node(a.lex("a", 0), a.lex("a", 2)))
assertParsed(" a a ").isEqualTo(node(a.lex("a", 1), a.lex("a", 3)))
assertNotParsed("aa").failedWithTokenMismatch(ws, a, 1)
assertNotParsed(" aa").failedWithTokenMismatch(ws, a, 2)
}

object : Grammar<SyntaxTree>() {
val ws by regexToken("\\s+", ignored = true)
val a by literalToken("a")
override val root by parlex(a) and (-ws * parlex(a)) map { node(it.first, it.second) }
}.run {
assertParsed("a a").isEqualTo(node(a.lex("a", 0), a.lex("a", 2)))
assertParsed(" a a ").isEqualTo(node(a.lex("a", 1), a.lex("a", 3)))
assertNotParsed("aa").failedWithTokenMismatch(ws, a, 1)
assertNotParsed(" aa").failedWithTokenMismatch(ws, a, 2)
}
}

companion object {

private fun parlex(token: Token) = parser { lexeme(token) }

private fun <T> Grammar<T>.assertParsed(text: String): Assert<T> = assertThat(parseOrThrow(text))

private fun <T> Grammar<T>.assertNotParsed(text: String): Assert<ParseError> =
assertThat(parse(text)).isInstanceOf(ParseError::class)

private fun <T> Grammar<T>.assertThatParsing(text: String): Assert<ParseResult<T>> = assertThat(parse(text))

private fun node(vararg literals: LiteralToken, startOffset: Int = 0): Node {
Expand Down