Add import-as syntax, VM performance optimizations, fix HTTP callbacks, bump to v1.3.0

- Add 'import <module> as <alias>' syntax with OP_IMPORT_AS opcode
- VM execute loop: cache frame fields as locals, inline readByte/readUint16
- Add small integer cache (-128..127) and singleton true/false/nil values
- Inline fast paths for int+int add/sub/compare in the hot loop
- Fix HTTP handler callback: use stopFP parameter in execute() so callbacks
  return to the caller instead of falling through to parent frames
- Document import aliases in imports.md

Author: TRC-Loop

ccolon/compiler/compiler.go

@@ -182,10 +182,16 @@ func (c *Compiler) compileImport(s *parser.ImportStmt) error {
 	idx := c.addConstant(s.Module)
 	if s.IsFile {
 		c.emitOp(OP_IMPORT_FILE, s.P.Line)
+		c.emitUint16(idx, s.P.Line)
+	} else if s.Alias != "" {
+		aliasIdx := c.addConstant(s.Alias)
+		c.emitOp(OP_IMPORT_AS, s.P.Line)
+		c.emitUint16(idx, s.P.Line)
+		c.emitUint16(aliasIdx, s.P.Line)
 	} else {
 		c.emitOp(OP_IMPORT, s.P.Line)
+		c.emitUint16(idx, s.P.Line)
 	}
-	c.emitUint16(idx, s.P.Line)
 	return nil
 }
 

ccolon/compiler/opcode.go

@@ -67,6 +67,7 @@ const (
 	OP_MARK_CONST
 	OP_CALL_KW
 	OP_FROM_IMPORT
+	OP_IMPORT_AS
 )
 
 type FuncObject struct {
@@ -122,6 +123,7 @@ var opNames = map[OpCode]string{
 	OP_MARK_CONST:  "MARK_CONST",
 	OP_CALL_KW:      "CALL_KW",
 	OP_FROM_IMPORT:  "FROM_IMPORT",
+	OP_IMPORT_AS:    "IMPORT_AS",
 }
 
 func (op OpCode) String() string {

ccolon/main.go

@@ -17,7 +17,7 @@ import (
 	"github.com/TRC-Loop/ccolon/vm"
 )
 
-const version = "1.2.2"
+const version = "1.3.0"
 
 func main() {
 	if len(os.Args) < 2 {

ccolon/parser/ast.go

@@ -265,6 +265,7 @@ type FuncDecl struct {
 
 type ImportStmt struct {
 	Module string
+	Alias  string // empty means no alias
 	IsFile bool
 	P      Position
 }

ccolon/parser/parser.go

@@ -153,7 +153,19 @@ func (p *Parser) parseImport() (*ImportStmt, error) {
 	if err != nil {
 		return nil, err
 	}
-	return &ImportStmt{Module: name.Literal, P: Position{tok.Line, tok.Col}}, nil
+
+	// import <module> as <alias>
+	var alias string
+	if p.current().Type == lexer.TOKEN_AS {
+		p.advance() // consume 'as'
+		aliasTok, err := p.expect(lexer.TOKEN_IDENT)
+		if err != nil {
+			return nil, err
+		}
+		alias = aliasTok.Literal
+	}
+
+	return &ImportStmt{Module: name.Literal, Alias: alias, P: Position{tok.Line, tok.Col}}, nil
 }
 
 func (p *Parser) parseFromImport() (*FromImportStmt, error) {