move to a direct byte code compiler (#8)

* chore: refactor to keep only the new parser and bytecode vm

* scanner: remove Token.value field

* scanner: remove scanner.kind field

* chore: move language specification in lang package

This avoid a cyclic dependency in scanner_test which can now use
the golang/GoSpec language specification for Go.

* clean code

* scanner: export scanner fields

Also parser now generate function calls, including externals.

* chore: fix lint issues

* parser: handle strings

* wip

* parser: implement support for 'if, else, else if' statements

Resolving labels in the compiler still in progress.

* parser: support if statements, improve compiler

* improve handling of functions

* improve support of local variables

* scanner: trim leading and trailing spaces

* fixes to make fibonacci work

* parser: improve README, fix function parameters parsing

1 files changed, 0 insertions, 58 deletions

diff --git a/codegen/compiler_test.go b/codegen/compiler_test.go
deleted file mode 100644
index 5c7e9d3..0000000
--- a/codegen/compiler_test.go
+++ /dev/null
@@ -1,58 +0,0 @@
-package codegen
-
-import (
-	"fmt"
-	"log"
-	"testing"
-
-	"github.com/gnolang/parscan/lang/golang"
-	"github.com/gnolang/parscan/parser"
-	"github.com/gnolang/parscan/vm1"
-)
-
-func TestCodeGen(t *testing.T) {
-	log.SetFlags(log.Lshortfile)
-	for _, test := range codeGenTests {
-		test := test
-		t.Run("", func(t *testing.T) {
-			c := NewCompiler()
-			c.AddSym(fmt.Println, "println")
-			n := &parser.Node{}
-			var err error
-			if n.Child, err = golang.GoParser.Parse(test.src, n); err != nil {
-				t.Error(err)
-			}
-			errStr := ""
-			if err = c.CodeGen(n); err != nil {
-				errStr = err.Error()
-			}
-			if errStr != test.err {
-				t.Errorf("got error %#v, want error %#v", errStr, test.err)
-			}
-			t.Log("data:", c.Data)
-			t.Log("code:", vm1.Disassemble(c.Code))
-			if s := vm1.Disassemble(c.Code); s != test.asm {
-				t.Errorf("got %#v, want %#v", s, test.asm)
-			}
-		})
-	}
-}
-
-var codeGenTests = []struct {
-	src, asm, sym, err string
-}{{ // #00
-	src: "1+2",
-	asm: "Push 1\nPush 2\nAdd\n",
-}, { // #01
-	src: `println("Hello")`,
-	asm: "Dup 0\nDup 1\nCallX 1\nPop 2\n",
-}, { // #02
-	src: `a := 2; println(a)`,
-	asm: "Push 2\nAssign 1\nDup 0\nDup 1\nCallX 1\nPop 2\n",
-}, { // #03
-	src: `a := 2; if a < 3 {println(a)}; println("bye")`,
-	asm: "Push 2\nAssign 1\nDup 1\nPush 3\nLower\nJumpFalse 5\nDup 0\nDup 1\nCallX 1\nPop 2\nDup 0\nDup 2\nCallX 1\nPop 2\n",
-}, { // #04
-	src: "func add(a int, b int) int { return a + b }",
-	asm: "Fdup -2\nFdup -3\nAdd\nReturn 1 2\n",
-}}