Fix parser edge-cases, fix wasm, refactor

core/all_test.go

@@ -130,13 +130,13 @@ func TestAll(t *testing.T) {
 			}
 
 			t.Log("Initializing parser")
-			p := NewParser(tokens)
+			p := NewParser(tc.src, tokens)
 
 			t.Log("Parsing tokens")
-			tree, err := p.Parse()
+			tree, err := p.Parse(tc.src)
 
 			if err != nil {
-				print(err.(ParsingError).Format([]rune(tc.src)))
+				print(err.(ParsingError).Format())
 				t.Fatalf("parser had an error")
 			}
 
@@ -144,7 +144,7 @@ func TestAll(t *testing.T) {
 			c := NewCompiler([]rune(tc.src))
 
 			t.Log("Compiling parse tree")
-			err = c.compile(tree)
+			err = c.Compile(tree)
 			if err != nil {
 				t.Fatalf("Compiler had an error: %s", err)
 			}
@@ -173,11 +173,11 @@ func BenchmarkAll(b *testing.B) {
 				l := NewLexer(tc.src)
 				tokens, _ := l.Tokenize()
 
-				p := NewParser(tokens)
-				tree, _ := p.Parse()
+				p := NewParser(tc.src, tokens)
+				tree, _ := p.Parse(tc.src)
 
 				c := NewCompiler([]rune(tc.src))
-				_ = c.compile(tree)
+				_ = c.Compile(tree)
 
 				vm := NewVM(c.Chunk, 256, 256)
 

core/compiler.go

@@ -215,7 +215,7 @@ func (c *Compiler) compile(tree Node) error {
 		}
 
 	case ReferenceNodeType:
-		c.getVar(tree.(*ReferenceNode).name)
+		c.addGetVar(tree.(*ReferenceNode).name)
 
 	case BinaryNodeType:
 		err := c.compileBinary(tree.(*BinaryNode))
@@ -275,7 +275,7 @@ func (c *Compiler) compile(tree Node) error {
 			return err
 		}
 		if sig.Type() != TypeBoolean {
-			return c.error(fmt.Sprintf("condition cannot give non-boolean type %s", sig), n.condition)
+			return c.error(fmt.Sprintf("conditional requires boolean; cannot use non-boolean type %s", sig), n.condition)
 		}
 
 		// the stack should have whether the condition was truthful
@@ -365,7 +365,7 @@ func (c *Compiler) compile(tree Node) error {
 				return c.error(fmt.Sprintf("%s is already declared in this scope", n.name), n)
 			}
 
-			err := c.setVar(n.name, n.value, n.declare)
+			err := c.addSetVar(n.name, n.value, n.declare)
 			if err != nil {
 				return err
 			}
@@ -871,7 +871,7 @@ func (c *Compiler) isVarDeclaredHere(name string) bool {
 	return false
 }
 
-func (c *Compiler) getVar(name string) {
+func (c *Compiler) addGetVar(name string) {
 	if c.isGlobal(name) {
 		c.add(InstructionGetGlobal)
 		c.addConstant(&StringValue{
@@ -885,7 +885,7 @@ func (c *Compiler) getVar(name string) {
 	}
 }
 
-func (c *Compiler) setVar(name string, value Node, declare bool) error {
+func (c *Compiler) addSetVar(name string, value Node, declare bool) error {
 	err := c.compile(value)
 	if err != nil {
 		return err

core/parser.go

@@ -129,7 +129,9 @@ func (p *Parser) Parse(path string) (*Program, error) {
 			return nil, err
 		}
 
-		statements = append(statements, b)
+		if b != nil {
+			statements = append(statements, b)
+		}
 	}
 
 	return &Program{
@@ -774,16 +776,23 @@ func (p *Parser) statement() (Node, error) {
 
 		return &BreakpointNode{}, nil
 
+	case TokenImport:
+		defer p.advance()
+		return nil, p.error("import statements must be top-level", p.curr)
+
 	default:
-		err := p.error("invalid statement", p.curr)
-		p.advance()
-		return nil, err
+		defer p.advance()
+		return nil, p.error("invalid statement", p.curr)
 	}
 }
 
 func (p *Parser) block(canBeStatement bool) (Node, error) {
 	if canBeStatement {
 		if !p.accept(TokenOpenBrace) {
+			if p.curr.Type == TokenEOF {
+				return nil, nil
+			}
+
 			return p.statement()
 		}
 	} else {

core/parser_test.go

@@ -10,7 +10,7 @@ import (
 func TestNewParser(t *testing.T) {
 	tokens := make([]Token, 0)
 
-	p := NewParser(tokens)
+	p := NewParser("", tokens)
 
 	if p == nil {
 		t.Fatal("parser should not be nil")
@@ -34,7 +34,7 @@ func TestNewParser(t *testing.T) {
 func BenchmarkNewParser(b *testing.B) {
 	tokens := make([]Token, 0)
 	for i := 0; i < b.N; i++ {
-		_ = NewParser(tokens)
+		_ = NewParser("", tokens)
 	}
 }
 
@@ -908,17 +908,17 @@ func TestParser_Parse(t *testing.T) {
 
 		t.Run(name, func(t *testing.T) {
 			t.Logf("Initializing parser")
-			p := NewParser(data.tokens)
+			p := NewParser("", data.tokens)
 
 			t.Logf("Parsing main")
-			tree, err := p.Parse()
+			tree, err := p.Parse("")
 
 			if err != nil {
-				t.Fatalf("Unexpected error(s): %s", err.(ParsingError).Format([]rune(SerializeTokens(data.tokens))))
+				t.Fatalf("Unexpected error(s): %s", err.(ParsingError).Format())
 			}
 
 			t.Logf("Checking parsed tree")
-			NodeEquality(t, tree, data.tree)
+			NodeEquality(t, tree.Block, data.tree)
 		})
 	}
 }
@@ -929,9 +929,9 @@ func BenchmarkParser_Parse(b *testing.B) {
 	for name, data := range tokenData {
 		b.Run(name, func(b *testing.B) {
 			for i := 0; i < b.N; i++ {
-				p := NewParser(data.tokens)
+				p := NewParser("", data.tokens)
 
-				_, _ = p.Parse()
+				_, _ = p.Parse("")
 			}
 		})
 	}

wasm/wasm.go

@@ -13,6 +13,10 @@ type JsResolver struct {
 	jsResolver js.Value
 }
 
+func (r *JsResolver) IsSame(a, b string) bool {
+	return a == b
+}
+
 func (r *JsResolver) Resolve(name string) (string, error) {
 	jsv := r.jsResolver.Invoke(name)
 
@@ -56,7 +60,7 @@ func run(_ js.Value, args []js.Value) interface{} {
 
 	parser := core.NewParser(source, tokens)
 
-	tree, err := parser.Parse()
+	tree, err := parser.Parse(source)
 
 	if err != nil {
 		var e core.FormatedError