Method generateHoistedMatch

pkg/codegen/match.go:803–836

generateHoistedMatch generates code for argument context (fn(match ...)). Produces: var tmp TYPE; switch { case ...: tmp = value }; fn(tmp) Returns temp var name as expression replacement. Falls back to IIFE if type cannot be inferred.

()

// Returns temp var name as expression replacement.
// Falls back to IIFE if type cannot be inferred.
func (g *MatchCodeGen) generateHoistedMatch() ast.CodeGenResult {
	tmpVar := g.TempVar("result")
	varType := g.Context.VarType

	if varType == "" {
		// IIFE fallback when type cannot be inferred
		g.generateMatchIIFE()
		return g.Result()
	}

	// Generate hoisted code: var tmp TYPE; switch { case ...: tmp = value }
	hoistedBuf := &bytes.Buffer{}
	hoistedBuf.WriteString(fmt.Sprintf("var %s %s\n", tmpVar, varType))

	// Save current buffer and switch to hoistedBuf
	origBuf := g.Buf
	g.Buf = *hoistedBuf

	// Generate switch with assignments to tmpVar
	g.generateMatchSwitchWithAssignment(tmpVar)

	// Get the hoisted code from the buffer
	hoistedCode := g.Buf.Bytes()

	// Restore original buffer
	g.Buf = origBuf

	// Build result
	result := g.Result()
	result.HoistedCode = hoistedCode // Hoisted code goes BEFORE the statement
	result.Output = []byte(tmpVar)   // Replace match expression with tmpVar

	return result
}

// generateMatchSwitchWithAssignment generates switch statement that assigns to varName.
// Example: switch x.(type) { case A: varName = "a"; case B: varName = "b" }