Reorganized file structure

src/build/Function.go

@@ -0,0 +1,96 @@
+package build
+
+import (
+	"fmt"
+	"strconv"
+
+	"git.akyoto.dev/cli/q/src/build/arch/x64"
+	"git.akyoto.dev/cli/q/src/build/asm"
+	"git.akyoto.dev/cli/q/src/build/config"
+	"git.akyoto.dev/cli/q/src/build/token"
+	"git.akyoto.dev/go/color/ansi"
+)
+
+// Function represents a function.
+type Function struct {
+	Name      string
+	Head      token.List
+	Body      token.List
+	Assembler asm.Assembler
+}
+
+// Compile turns a function into machine code.
+func (f *Function) Compile() {
+	if config.Verbose {
+		ansi.Underline.Println(f.Name)
+	}
+
+	for _, line := range f.Lines() {
+		if config.Verbose {
+			fmt.Println("[line]", line)
+		}
+
+		if len(line) == 0 {
+			continue
+		}
+
+		if line[0].Kind == token.Identifier && line[0].Text() == "syscall" {
+			paramTokens := line[2 : len(line)-1]
+			start := 0
+			i := 0
+			var parameters []token.List
+
+			for i < len(paramTokens) {
+				if paramTokens[i].Kind == token.Separator {
+					parameters = append(parameters, paramTokens[start:i])
+					start = i + 1
+				}
+
+				i++
+			}
+
+			if i != start {
+				parameters = append(parameters, paramTokens[start:i])
+			}
+
+			for i, list := range parameters {
+				if list[0].Kind == token.Number {
+					numAsText := list[0].Text()
+					n, _ := strconv.Atoi(numAsText)
+					f.Assembler.MoveRegisterNumber(x64.SyscallArgs[i], uint64(n))
+				}
+			}
+
+			f.Assembler.Syscall()
+		}
+	}
+}
+
+// Lines returns the lines in the function body.
+func (f *Function) Lines() []token.List {
+	var (
+		lines []token.List
+		start = 0
+		i     = 0
+	)
+
+	for i < len(f.Body) {
+		if f.Body[i].Kind == token.NewLine {
+			lines = append(lines, f.Body[start:i])
+			start = i + 1
+		}
+
+		i++
+	}
+
+	if i != start {
+		lines = append(lines, f.Body[start:i])
+	}
+
+	return lines
+}
+
+// String returns the function name.
+func (f *Function) String() string {
+	return f.Name
+}