fixed 1e-6 type Real literal

docs/samples/sum.lyng

@@ -0,0 +1,26 @@
+/*
+    Calculate the limit of Sum( f(n) )
+    until it reaches asymptotic limit 0.00001% change
+
+    return null or found limit
+*/
+fun findSumLimit(f) {
+    var sum = 0.0
+    for( n in 1..1000000 ) {
+        val s0 = sum
+        sum += f(n)
+        if( abs(sum - s0) / abs(sum) < 1.0e-6 ) {
+            println("limit reached after "+n+" rounds")
+            break sum
+        }
+        n++
+    }
+    else {
+        println("limit not reached")
+        null
+    }
+}
+
+val limit = findSumLimit { n -> 1.0/n/n }
+
+println("Result: "+limit)

library/src/commonMain/kotlin/net/sergeych/lyng/ArgsDeclaration.kt

@@ -11,7 +11,8 @@ data class ArgsDeclaration(val params: List<Item>, val endTokenType: Token.Type)
         val start = params.indexOfFirst { it.defaultValue != null }
         if (start >= 0)
             for (j in start + 1 until params.size)
-                if (params[j].defaultValue == null) throw ScriptError(
+                // last non-default could be lambda:
+                if (params[j].defaultValue == null && j != params.size - 1) throw ScriptError(
                     params[j].pos,
                     "required argument can't follow default one"
                 )
@@ -22,7 +23,7 @@ data class ArgsDeclaration(val params: List<Item>, val endTokenType: Token.Type)
      */
     suspend fun assignToContext(
         context: Context,
-        fromArgs: Arguments = context.args,
+        _fromArgs: Arguments = context.args,
         defaultAccessType: AccessType = AccessType.Var,
         defaultVisibility: Visibility = Visibility.Public
     ) {
@@ -31,6 +32,9 @@ data class ArgsDeclaration(val params: List<Item>, val endTokenType: Token.Type)
                 a.visibility ?: defaultVisibility)
         }
 
+        // will be used with last lambda arg fix
+        val fromArgs = _fromArgs
+
         suspend fun processHead(index: Int): Int {
             var i = index
             while (i != params.size) {

library/src/commonMain/kotlin/net/sergeych/lyng/Compiler.kt

@@ -1330,7 +1330,7 @@ class Compiler(
         /**
          * The keywords that stop processing of expression term
          */
-        val stopKeywords = setOf("break", "continue", "return", "if", "when", "do", "while", "for", "class", "struct")
+        val stopKeywords = setOf("do", "break", "continue", "return", "if", "when", "do", "while", "for", "class", "struct")
     }
 }
 

library/src/commonMain/kotlin/net/sergeych/lyng/Parser.kt

@@ -293,7 +293,19 @@ private class Parser(fromPos: Pos) {
     private fun decodeNumber(p1: String, start: Pos): Token =
         if (pos.end)
             Token(p1, start, Token.Type.INT)
-        else if (currentChar == '.') {
+        else if( currentChar == 'e' || currentChar == 'E' ) {
+            pos.advance()
+            var negative = false
+            if (currentChar == '+')
+                pos.advance()
+            else if (currentChar == '-') {
+                negative = true
+                pos.advance()
+            }
+            var p3 = loadChars(digits)
+            if (negative) p3 = "-$p3"
+            Token("${p1}e$p3", start, Token.Type.REAL)
+        } else if (currentChar == '.') {
             // could be decimal
             pos.advance()
             if (currentChar in digitsSet) {

library/src/commonTest/kotlin/ScriptTest.kt

@@ -57,6 +57,8 @@ class ScriptTest {
         check("17.2e22", Token.Type.REAL, 0, 0, "17.2E+22")
         check("17.2e22", Token.Type.REAL, 0, 0, "17.2E22")
         check("17.2e-22", Token.Type.REAL, 0, 0, "17.2E-22")
+        check("17.2e-22", Token.Type.REAL, 0, 0, "17.2E-22")
+        check("1e-22", Token.Type.REAL, 0, 0, "1E-22")
 
         // hex
         check("1", Token.Type.HEX, 0, 0, "0x1")
@@ -490,11 +492,13 @@ class ScriptTest {
     fun testAssignArgumentsNoEllipsis() = runTest {
         // equal args, no ellipsis, no defaults, ok
         val ttEnd = Token.Type.RBRACE
-        var pa = ArgsDeclaration(listOf(
+        var pa = ArgsDeclaration(
+            listOf(
                 ArgsDeclaration.Item("a"),
                 ArgsDeclaration.Item("b"),
                 ArgsDeclaration.Item("c"),
-        ), ttEnd)
+            ), ttEnd
+        )
         var c = Context(pos = Pos.builtIn, args = Arguments.from(listOf(1, 2, 3).map { it.toObj() }))
         pa.assignToContext(c)
         assertEquals(ObjInt(1), c["a"]?.value)
@@ -506,11 +510,13 @@ class ScriptTest {
             pa.assignToContext(c)
         }
         // less args, no ellipsis, defaults, ok
-        pa = ArgsDeclaration(listOf(
+        pa = ArgsDeclaration(
+            listOf(
                 ArgsDeclaration.Item("a"),
                 ArgsDeclaration.Item("b"),
                 ArgsDeclaration.Item("c", defaultValue = statement { ObjInt(100) }),
-        ), ttEnd)
+            ), ttEnd
+        )
         pa.assignToContext(c)
         assertEquals(ObjInt(1), c["a"]?.value)
         assertEquals(ObjInt(2), c["b"]?.value)
@@ -528,10 +534,12 @@ class ScriptTest {
         // equal args,
         // less args, no ellipsis, defaults, ok
         val ttEnd = Token.Type.RBRACE
-        val pa = ArgsDeclaration(listOf(
+        val pa = ArgsDeclaration(
+            listOf(
                 ArgsDeclaration.Item("a"),
                 ArgsDeclaration.Item("b", isEllipsis = true),
-        ), ttEnd)
+            ), ttEnd
+        )
         var c = Context(args = Arguments.from(listOf(1, 2, 3).map { it.toObj() }))
         pa.assignToContext(c)
         c.eval("assert( a == 1 ); println(b)")
@@ -551,11 +559,13 @@ class ScriptTest {
     @Test
     fun testAssignArgumentsStartEllipsis() = runTest {
         val ttEnd = Token.Type.RBRACE
-        val pa = ArgsDeclaration(listOf(
+        val pa = ArgsDeclaration(
+            listOf(
                 ArgsDeclaration.Item("a", isEllipsis = true),
                 ArgsDeclaration.Item("b"),
                 ArgsDeclaration.Item("c"),
-        ), ttEnd)
+            ), ttEnd
+        )
         var c = Context(args = Arguments.from(listOf(0, 1, 2, 3).map { it.toObj() }))
         pa.assignToContext(c)
         c.eval("assertEquals( a,[0,1] )")
@@ -583,12 +593,14 @@ class ScriptTest {
     @Test
     fun testAssignArgumentsmiddleEllipsis() = runTest {
         val ttEnd = Token.Type.RBRACE
-        val pa = ArgsDeclaration(listOf(
+        val pa = ArgsDeclaration(
+            listOf(
                 ArgsDeclaration.Item("i"),
                 ArgsDeclaration.Item("a", isEllipsis = true),
                 ArgsDeclaration.Item("b"),
                 ArgsDeclaration.Item("c"),
-        ), ttEnd)
+            ), ttEnd
+        )
         var c = Context(args = Arguments.from(listOf(-1, 0, 1, 2, 3).map { it.toObj() }))
         pa.assignToContext(c)
         c.eval("assertEquals( i, -1 )")
@@ -1385,7 +1397,8 @@ class ScriptTest {
     @Test
     fun testSimpleStruct() = runTest {
         val c = Context()
-        c.eval("""
+        c.eval(
+            """
             class Point(x,y)
             assert( Point::class is Class )
             val p = Point(2,3)
@@ -1398,13 +1411,15 @@ class ScriptTest {
             val p2 = Point(p.x+1,p.y+1)
             p.x = 0
             assertEquals( 0, p.x )
-        """.trimIndent())
+        """.trimIndent()
+        )
     }
 
     @Test
     fun testNonAssignalbeFieldInStruct() = runTest {
         val c = Context()
-        c.eval("""
+        c.eval(
+            """
             class Point(x,y)
             val p = Point("2",3)
             assert(p is Point)
@@ -1413,13 +1428,15 @@ class ScriptTest {
             
             p.x = 0
             assertEquals( 0, p.x )
-        """.trimIndent())
+        """.trimIndent()
+        )
     }
 
     @Test
     fun testStructBodyVal() = runTest {
         val c = Context()
-        c.eval("""
+        c.eval(
+            """
             class Point(x,y) {
                 val length = sqrt(x*x+y*y)
                 var foo = "zero"
@@ -1433,13 +1450,15 @@ class ScriptTest {
             assert( p.foo == "bar")
             // length is a val, is shoud not change
             assert( p.length == 5 )
-            """.trimIndent())
+            """.trimIndent()
+        )
     }
 
     @Test
     fun testStructBodyFun() = runTest {
         val c = Context()
-        c.eval("""
+        c.eval(
+            """
             class Point(x,y) {
                 fun length() { 
                     sqrt(x*x+y*y) 
@@ -1451,23 +1470,27 @@ class ScriptTest {
             p.y = 10
             println(p.length())
             assertEquals(sqrt(109), p.length())
-            """.trimIndent())
+            """.trimIndent()
+        )
     }
 
     @Test
     fun testPrivateConstructorParams() = runTest {
         val c = Context()
-        c.eval("""
+        c.eval(
+            """
             class Point(private var x,y)
             val p = Point(1,2)
             p.y = 101
             assertThrows { p.x = 10 }
-            """)
+            """
+        )
     }
 
     @Test
     fun testLBraceMethodCall() = runTest {
-        eval("""
+        eval(
+            """
             class Foo() {
                 fun cond(block) { 
                     block()
@@ -1475,22 +1498,26 @@ class ScriptTest {
             }
             val f = Foo()
             assertEquals( 1, f.cond { 1 } )
-        """.trimIndent())
+        """.trimIndent()
+        )
     }
 
     @Test
     fun testLBraceFnCall() = runTest {
-        eval("""
+        eval(
+            """
             fun cond(block) { 
                 block()
             }
             assertEquals( 1, cond { 1 } )
-        """.trimIndent())
+        """.trimIndent()
+        )
     }
 
     @Test
     fun testClasstoString() = runTest {
-        eval("""
+        eval(
+            """
             class Point {
                 var x
                 var y
@@ -1499,19 +1526,22 @@ class ScriptTest {
             p.x = 1
             p.y = 2
             println(p)
-        """.trimIndent())
+        """.trimIndent()
+        )
     }
 
     @Test
     fun testClassDefaultCompare() = runTest {
-        eval("""
+        eval(
+            """
             class Point(x,y)
             assert( Point(1,2) == Point(1,2) )
             assert( Point(1,2) !== Point(1,2) )
             assert( Point(1,2) != Point(1,3) )
             assert( Point(1,2) < Point(2,2) )
             assert( Point(1,2) < Point(1,3) )
-        """.trimIndent())
+        """.trimIndent()
+        )
     }
 
     @Test
@@ -1520,4 +1550,51 @@ class ScriptTest {
         assertFalse(Visibility.Private.isPublic)
         assertFalse(Visibility.Protected.isPublic)
     }
+
+    @Test
+    fun segfault1Test() = runTest {
+        eval(
+            """
+            
+            fun findSumLimit(f) {
+                var sum = 0.0
+                for( n in 1..1000000 ) {
+                    val s0 = sum
+                    sum += f(n)
+                    if( abs(sum - s0) < 0.00001 ) { 
+                        println("limit reached after "+n+" rounds")
+                        break sum
+                    }
+                    n++
+                }
+                else {
+                    println("limit not reached")
+                    null
+                }
+            }
+
+            val limit = findSumLimit { n -> 1.0/n/n }
+            
+            println("Result: "+limit)
+        """
+        )
+    }
+
+    @Test
+    fun testIntExponentRealForm() = runTest {
+        assertEquals("1.0E-6", eval("1e-6").toString())
+    }
+
+//    @Test
+//    fun testLambdaLastArgAfterDetault() = runTest {
+//        val c = Context()
+//        eval("""
+//            // this means last is lambda:
+//            fun f(e=1, f) {
+//                "e="+e+"f="+f()
+//            }
+//            assertEquals("e=1f=xx", f { "xx" })
+//        """.trimIndent())
+//
+//    }
 }