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Refactor nullable suffix handling in compiler (nullable declaration bug fixed)

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This commit is contained in:
Sergey Chernov 2026-01-12 16:15:19 +01:00
parent 017111827d
commit 80933c287d
3 changed files with 23 additions and 9 deletions
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7
lynglib/src/commonMain/kotlin/net/sergeych/lyng/Compiler.kt
View File

@ -1048,7 +1048,12 @@ class Compiler(
}
// Nullable suffix after base or generic
val isNullable = cc.skipTokenOfType(Token.Type.QUESTION, isOptional = true)
val isNullable = if (cc.skipTokenOfType(Token.Type.QUESTION, isOptional = true)) {
true
} else if (cc.skipTokenOfType(Token.Type.IFNULLASSIGN, isOptional = true)) {
cc.pushPendingAssign()
true
} else false
val endPos = cc.currentPos()
val miniRef = buildBaseRef(if (miniArgs != null) endPos else lastEnd, miniArgs, isNullable)

23
lynglib/src/commonMain/kotlin/net/sergeych/lyng/CompilerContext.kt
View File

@ -35,8 +35,9 @@ class CompilerContext(val tokens: List<Token>) {
var currentIndex = 0
private var pendingGT = 0
private var pendingAssign = false
fun hasNext() = currentIndex < tokens.size || pendingGT > 0
fun hasNext() = currentIndex < tokens.size || pendingGT > 0 || pendingAssign
fun hasPrevious() = currentIndex > 0
fun next(): Token {
if (pendingGT > 0) {
@ -44,6 +45,11 @@ class CompilerContext(val tokens: List<Token>) {
val last = tokens[currentIndex - 1]
return Token(">", last.pos.copy(column = last.pos.column + 1), Token.Type.GT)
}
if (pendingAssign) {
pendingAssign = false
val last = tokens[currentIndex - 1]
return Token("=", last.pos.copy(column = last.pos.column + 1), Token.Type.ASSIGN)
}
return if (currentIndex < tokens.size) tokens[currentIndex++]
else Token("", tokens.last().pos, Token.Type.EOF)
}
@ -52,16 +58,19 @@ class CompilerContext(val tokens: List<Token>) {
pendingGT++
}
fun previous() = if (pendingGT > 0) {
pendingGT-- // This is wrong, previous should go back.
// But we don't really use previous() in generics parser after splitting.
throw IllegalStateException("previous() not supported after pushPendingGT")
fun pushPendingAssign() {
pendingAssign = true
}
fun previous() = if (pendingGT > 0 || pendingAssign) {
throw IllegalStateException("previous() not supported after pushPending tokens")
} else if (!hasPrevious()) throw IllegalStateException("No previous token") else tokens[--currentIndex]
fun savePos() = (currentIndex shl 2) or (pendingGT and 3)
fun savePos() = (currentIndex shl 3) or (pendingGT and 3) or (if (pendingAssign) 4 else 0)
fun restorePos(pos: Int) {
currentIndex = pos shr 2
currentIndex = pos shr 3
pendingGT = pos and 3
pendingAssign = (pos and 4) != 0
}
fun ensureLabelIsValid(pos: Pos, label: String) {

2
lynglib/src/commonTest/kotlin/ScriptTest.kt
View File

@ -4803,7 +4803,7 @@ class ScriptTest {
fun f(a: String = "foo") = a + "!"
fun g(a: String? = null) = a ?: "!!"
assertEquals(f(), "foo!")
assertEquals(f(), "!!")
assertEquals(g(), "!!")
assertEquals(f("bar"), "bar!")
class T(b: Int=42,c: String?=null)
assertEquals(42, T().b)