fix #53 chained calls and multiline expressions

lynglib/build.gradle.kts

@@ -138,6 +138,7 @@ publishing {
     }
 }
 
+
 //mavenPublishing {
 //    publishToMavenCentral(SonatypeHost.CENTRAL_PORTAL)
 //

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

@@ -211,11 +211,32 @@ class Compiler(
     private suspend fun parseTerm(): Accessor? {
         var operand: Accessor? = null
 
+        // newlines _before_
+        cc.skipWsTokens()
+
         while (true) {
             val t = cc.next()
             val startPos = t.pos
             when (t.type) {
-                Token.Type.NEWLINE, Token.Type.SEMICOLON, Token.Type.EOF, Token.Type.RBRACE, Token.Type.COMMA -> {
+//                Token.Type.NEWLINE, Token.Type.SINLGE_LINE_COMMENT, Token.Type.MULTILINE_COMMENT-> {
+//                    continue
+//                }
+
+                // very special case chained calls: call()<NL>.call2 {}.call3()
+                Token.Type.NEWLINE -> {
+                    val saved = cc.savePos()
+                    if( cc.peekNextNonWhitespace().type == Token.Type.DOT) {
+                        // chained call continue from it
+                        continue
+                    } else {
+                        // restore position and stop parsing as a term:
+                        cc.restorePos(saved)
+                        cc.previous()
+                        return operand
+                    }
+                }
+
+                Token.Type.SEMICOLON, Token.Type.EOF, Token.Type.RBRACE, Token.Type.COMMA -> {
                     cc.previous()
                     return operand
                 }
@@ -468,7 +489,13 @@ class Compiler(
                     // range operator
                     val isEndInclusive = t.type == Token.Type.DOTDOT
                     val left = operand
-                    val right = parseExpression()
+                    // if it is an open end range, then the end of line could be here that we do not want
+                    // to skip in parseExpression:
+                    val current = cc.current()
+                    val right = if( current.type == Token.Type.NEWLINE || current.type == Token.Type.SINLGE_LINE_COMMENT)
+                        null
+                    else
+                        parseExpression()
                     operand = Accessor {
                         ObjRange(
                             left?.getter?.invoke(it)?.value ?: ObjNull,
@@ -955,7 +982,7 @@ class Compiler(
 
     private suspend fun parseWhenStatement(): Statement {
         // has a value, when(value) ?
-        var t = cc.skipWsTokens()
+        var t = cc.nextNonWhitespace()
         return if (t.type == Token.Type.LPAREN) {
             // when(value)
             val value = parseStatement() ?: throw ScriptError(cc.currentPos(), "when(value) expected")
@@ -978,7 +1005,7 @@ class Compiler(
 
                 // loop conditions
                 while (true) {
-                    t = cc.skipWsTokens()
+                    t = cc.nextNonWhitespace()
 
                     when (t.type) {
                         Token.Type.IN,
@@ -1191,11 +1218,11 @@ class Compiler(
         cc.skipTokenOfType(Token.Type.LBRACE)
 
         do {
-            val t = cc.skipWsTokens()
+            val t = cc.nextNonWhitespace()
             when (t.type) {
                 Token.Type.ID -> {
                     names += t.value
-                    val t1 = cc.skipWsTokens()
+                    val t1 = cc.nextNonWhitespace()
                     when (t1.type) {
                         Token.Type.COMMA ->
                             continue

lynglib/src/commonMain/kotlin/net/sergeych/lyng/CompilerContext.kt

@@ -39,7 +39,6 @@ class CompilerContext(val tokens: List<Token>) {
     fun next() =
         if (currentIndex < tokens.size) tokens[currentIndex++]
         else Token("", tokens.last().pos, Token.Type.EOF)
-//        throw IllegalStateException("No more tokens")
 
     fun previous() = if (!hasPrevious()) throw IllegalStateException("No previous token") else tokens[--currentIndex]
 
@@ -131,6 +130,28 @@ class CompilerContext(val tokens: List<Token>) {
         previous()
     }
 
+    fun nextNonWhitespace(): Token {
+        while (true) {
+            val t = next()
+            if (t.type !in wstokens) return t
+        }
+    }
+
+    /**
+     * Find next non-whitespace token and return it. The token is not extracted,
+     * is will be returned on [next] call.
+     * @return next non-whitespace token without extracting it from tokens list
+     */
+    fun peekNextNonWhitespace(): Token {
+        while (true) {
+            val t = next()
+            if (t.type !in wstokens) {
+                previous()
+                return t
+            }
+        }
+    }
+
 
     inline fun ifNextIs(typeId: Token.Type, f: (Token) -> Unit): Boolean {
         val t = next()
@@ -207,7 +228,7 @@ class CompilerContext(val tokens: List<Token>) {
         while (current().type in wstokens) {
             next()
         }
-        return next()
+        return current()
     }
 
     companion object {

lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/Obj.kt

@@ -436,6 +436,9 @@ object ObjNull : Obj() {
     }
 }
 
+/**
+ * TODO: get rid of it. Maybe we ise some Lyng inheritance instead
+ */
 interface Numeric {
     val longValue: Long
     val doubleValue: Double

lynglib/src/commonTest/kotlin/ScriptTest.kt

@@ -1184,6 +1184,35 @@ class ScriptTest {
         )
     }
 
+    @Test
+    fun testOpenEndRanges2() = runTest {
+        eval(
+            """
+            var r = 5..; var r2 = 6..
+            val r3 = 7.. // open end
+            assert( r::class == Range)
+            assert( r.end == null)
+            assert( r.start == 5)
+            
+            assert( r3::class == Range)
+            assertEquals( r3.end, null)
+            assert( r3.start == 7)
+        """.trimIndent()
+        )
+    }
+
+    @Test
+    fun testOpenEndRanges3() = runTest {
+        eval(
+            """
+            val r3 = 7.. // open end with comment
+            assert( r3::class == Range)
+            assertEquals( r3.end, null)
+            assert( r3.start == 7)
+        """.trimIndent()
+        )
+    }
+
     @Test
     fun testCharacterRange() = runTest {
         eval(
@@ -2991,5 +3020,20 @@ class ScriptTest {
         """.trimIndent())
     }
 
+    @Test
+    fun testNewlinesAnsCommentsInExpressions() = runTest {
+        assertEquals( 2, (Scope().eval("""
+            val e = 1 + 4 -
+                3
+        """.trimIndent())).toInt())
+
+        eval("""
+                val x = [1,2,3]
+                    .map { it * 10 }
+                    .map { it + 1 }
+                assertEquals( [11,21,31], x)
+            """.trimIndent())
+    }
+
 
 }