初步支持 global, AST 暂时作为 var 处理

README-zh.md

@@ -54,9 +54,11 @@
 ```wa
 import "fmt"
 
+global year: i32 = 2023
+
 func main {
-	println("你好，凹语言！")
-	println(add(40, 2))
+	println("hello, Wa!")
+	println(add(40, 2), year)
 
 	fmt.Println(1+1)
 }
@@ -71,7 +73,7 @@ func add(a: i32, b: i32) => i32 {
 ```
 $ go run main.go hello.wa 
 你好，凹语言！
-42
+42 2023
 2
 ```
 

README.md

@@ -60,9 +60,11 @@ Print rune and call function：
 ```wa
 import "fmt"
 
+global year: i32 = 2023
+
 func main {
 	println("hello, Wa!")
-	println(add(40, 2))
+	println(add(40, 2), year)
 
 	fmt.Println(1+1)
 }
@@ -77,7 +79,7 @@ Execute the program:
 ```
 $ go run main.go hello.wa 
 hello, Wa!
-42
+42 2023
 2
 ```
 

internal/parser/parser.go

@@ -497,9 +497,10 @@ var stmtStart = map[token.Token]bool{
 }
 
 var declStart = map[token.Token]bool{
-	token.CONST: true,
-	token.TYPE:  true,
-	token.VAR:   true,
+	token.CONST:  true,
+	token.TYPE:   true,
+	token.VAR:    true,
+	token.GLOBAL: true,
 }
 
 var exprEnd = map[token.Token]bool{
@@ -2458,6 +2459,11 @@ func (p *parser) parseGenDecl(keyword token.Token, f parseSpecFunction) *ast.Gen
 
 	doc := p.leadComment
 	pos := p.expect(keyword)
+
+	if keyword == token.GLOBAL {
+		keyword = token.VAR // TODO(chai2010): AST 支持 global
+	}
+
 	var lparen, rparen token.Pos
 	var list []ast.Spec
 	if p.tok == token.LPAREN {
@@ -2564,7 +2570,7 @@ func (p *parser) parseDecl(sync map[token.Token]bool) ast.Decl {
 
 	var f parseSpecFunction
 	switch p.tok {
-	case token.CONST, token.VAR:
+	case token.CONST, token.VAR, token.GLOBAL:
 		f = p.parseValueSpec
 
 	case token.TYPE:

internal/token/token.go

@@ -106,6 +106,7 @@ const (
 	FOR
 
 	FUNC
+	GLOBAL
 	IF
 	IMPORT
 
@@ -203,6 +204,7 @@ var tokens = [...]string{
 	FOR:     "for",
 
 	FUNC:   "func",
+	GLOBAL: "global",
 	IF:     "if",
 	IMPORT: "import",
 

waroot/hello.wa

@@ -3,9 +3,11 @@
 import "fmt"
 import "runtime"
 
+global year: i32 = 2023
+
 func main {
 	println("你好，凹语言！", runtime.WAOS)
-	println(add(40, 2))
+	println(add(40, 2), year)
 
 	fmt.Println("1+1 =", 1+1)
 }