Implemented parameters

src/build/scan.go

@@ -9,6 +9,7 @@ import (
 	"git.akyoto.dev/cli/q/src/build/arch/x64"
 	"git.akyoto.dev/cli/q/src/build/asm"
 	"git.akyoto.dev/cli/q/src/build/cpu"
+	"git.akyoto.dev/cli/q/src/build/expression"
 	"git.akyoto.dev/cli/q/src/build/fs"
 	"git.akyoto.dev/cli/q/src/build/token"
 	"git.akyoto.dev/cli/q/src/errors"
@@ -100,6 +101,7 @@ func scanFile(path string, functions chan<- *Function) error {
 		blockLevel  = 0
 		nameStart   = -1
 		paramsStart = -1
+		paramsEnd   = -1
 		bodyStart   = -1
 	)
 
@@ -128,12 +130,12 @@ func scanFile(path string, functions chan<- *Function) error {
 		for i < len(tokens) {
 			if tokens[i].Kind == token.GroupStart {
 				groupLevel++
+				i++
 
 				if groupLevel == 1 {
 					paramsStart = i
 				}
 
-				i++
 				continue
 			}
 
@@ -144,12 +146,13 @@ func scanFile(path string, functions chan<- *Function) error {
 					return errors.New(errors.MissingGroupStart, file, tokens[i].Position)
 				}
 
-				i++
-
 				if groupLevel == 0 {
+					paramsEnd = i
+					i++
 					break
 				}
 
+				i++
 				continue
 			}
 
@@ -221,17 +224,37 @@ func scanFile(path string, functions chan<- *Function) error {
 			return errors.New(errors.ExpectedFunctionDefinition, file, tokens[i].Position)
 		}
 
+		cpu := cpu.CPU{
+			General: x64.GeneralRegisters,
+			Syscall: x64.SyscallRegisters,
+			Return:  x64.ReturnValueRegisters,
+		}
+
+		parameters := tokens[paramsStart:paramsEnd]
+		variables := map[string]*Variable{}
+
+		err := expression.EachParameter(parameters, func(parameter token.List) error {
+			if len(parameter) == 1 {
+				name := parameter[0].Text()
+				register := x64.SyscallRegisters[1+len(variables)]
+				variables[name] = &Variable{Name: name, Register: register}
+				cpu.Use(register)
+				return nil
+			}
+
+			return errors.New(errors.NotImplemented, file, parameter[0].Position)
+		})
+
+		if err != nil {
+			return err
+		}
+
 		functions <- &Function{
 			Name:      tokens[nameStart].Text(),
 			File:      file,
-			Head:      tokens[paramsStart:bodyStart],
 			Body:      tokens[bodyStart:i],
-			Variables: map[string]*Variable{},
-			CPU: cpu.CPU{
-				General: x64.GeneralRegisters,
-				Syscall: x64.SyscallRegisters,
-				Return:  x64.ReturnValueRegisters,
-			},
+			Variables: variables,
+			CPU:       cpu,
 			Assembler: asm.Assembler{
 				Instructions: make([]asm.Instruction, 0, 32),
 			},