Implemented an abstract syntax tree

src/build/compiler.go

@@ -4,23 +4,23 @@ import (
 	"fmt"
 
 	"git.akyoto.dev/cli/q/src/build/asm"
+	"git.akyoto.dev/cli/q/src/build/ast"
 	"git.akyoto.dev/cli/q/src/build/cpu"
-	"git.akyoto.dev/cli/q/src/build/token"
 	"git.akyoto.dev/go/color/ansi"
 )
 
 // compiler is the data structure we embed in each function to preserve compilation state.
 type compiler struct {
-	assembler   asm.Assembler
-	count       counter
-	cpu         cpu.CPU
-	debug       []debug
 	err         error
 	definitions map[string]*Definition
 	variables   map[string]*Variable
 	functions   map[string]*Function
-	sideEffects int
 	finished    chan struct{}
+	assembler   asm.Assembler
+	debug       []debug
+	cpu         cpu.CPU
+	count       counter
+	sideEffects int
 }
 
 // counter stores how often a certain statement appeared so we can generate a unique label from it.
@@ -30,8 +30,8 @@ type counter struct {
 
 // debug is used to look up the source code at the given position.
 type debug struct {
+	source   ast.Node
 	position int
-	source   token.List
 }
 
 // PrintInstructions shows the assembly instructions.
@@ -66,7 +66,7 @@ func (c *compiler) PrintInstructions() {
 }
 
 // sourceAt retrieves the source code at the given position or `nil`.
-func (c *compiler) sourceAt(position int) token.List {
+func (c *compiler) sourceAt(position int) ast.Node {
 	for _, record := range c.debug {
 		if record.position == position {
 			return record.source