Extract scanning ASCII files into a util package

internal/data/accounting.go

@@ -3,6 +3,8 @@ package data
 import (
 	"bytes"
 	"errors"
+
+	"ur.gs/chaos-gate/internal/util/asciiscan"
 )
 
 // Comments are `//`, start of line only, for accounting
@@ -13,11 +15,14 @@ var (
 type Accounting map[string]string
 
 func LoadAccounting(filename string) (Accounting, error) {
-	scanLines, err := fileToScanner(filename)
+	s, err := asciiscan.New(filename)
 	if err != nil {
 		return nil, err
 	}
 
+	defer s.Close()
+	scanLines := s.Bufio()
+
 	out := make(Accounting)
 
 	for scanLines.Scan() {

internal/data/animated_object_definitions.go

@@ -1,12 +1,12 @@
 package data
 
 import (
-	"bufio"
 	"errors"
-	//	"fmt"
 	"io"
 	"strconv"
 	"strings"
+
+	"ur.gs/chaos-gate/internal/util/asciiscan"
 )
 
 type Cell struct {
@@ -35,13 +35,15 @@ type AnimatedObject struct {
 func LoadAnimatedObjectDefinitions(filename string) ([]AnimatedObject, error) {
 	var out []AnimatedObject
 
-	scanLines, err := fileToScanner(filename)
+	s, err := asciiscan.New(filename)
 	if err != nil {
 		return nil, err
 	}
 
+	defer s.Close()
+
 	for {
-		obj, err := consumeAnimatedObjectDefinition(scanLines)
+		obj, err := consumeAnimatedObjectDefinition(s)
 		if err == io.EOF {
 			return out, nil
 		} else if err != nil {
@@ -52,7 +54,7 @@ func LoadAnimatedObjectDefinitions(filename string) ([]AnimatedObject, error) {
 	}
 }
 
-func consumeAnimatedObjectDefinition(scanner *bufio.Scanner) (AnimatedObject, error) {
+func consumeAnimatedObjectDefinition(scanner *asciiscan.Scanner) (AnimatedObject, error) {
 	var out AnimatedObject
 	var err error
 
@@ -61,8 +63,7 @@ func consumeAnimatedObjectDefinition(scanner *bufio.Scanner) (AnimatedObject, er
 		return out, err
 	}
 
-	if err := consumeIntPtrs(
-		scanner,
+	if err := scanner.ConsumeIntPtrs(
 		&out.Direction, &out.Type, &out.AnimationID, &out.AnimationGroup, &out.AnimatedType,
 	); err != nil {
 		return out, err
@@ -89,8 +90,7 @@ func consumeAnimatedObjectDefinition(scanner *bufio.Scanner) (AnimatedObject, er
 		return out, err
 	}
 
-	if err := consumeIntPtrs(
-		scanner,
+	if err := scanner.ConsumeIntPtrs(
 		&out.Visibility, &out.Protection, &out.MinDelay, &out.DelayRange,
 	); err != nil {
 		return out, err
@@ -99,9 +99,9 @@ func consumeAnimatedObjectDefinition(scanner *bufio.Scanner) (AnimatedObject, er
 	return out, nil
 }
 
-func consumeCell(scanner *bufio.Scanner) (Cell, error) {
+func consumeCell(scanner *asciiscan.Scanner) (Cell, error) {
 	out := Cell{}
-	str, err := consumeString(scanner)
+	str, err := scanner.ConsumeString()
 	if err != nil {
 		return out, err
 	}

internal/data/data.go

@@ -1,15 +1,9 @@
 package data
 
 import (
-	"bufio"
-	"bytes"
-	"io"
-	"io/ioutil"
-	"strconv"
+	"ur.gs/chaos-gate/internal/util/asciiscan"
 )
 
-var hashComment = []byte("#")
-
 type CompassPoints struct {
 	N  int
 	NE int
@@ -26,80 +20,17 @@ type Range struct {
 	End   int
 }
 
-func fileToScanner(filename string) (*bufio.Scanner, error) {
-	data, err := ioutil.ReadFile(filename)
-	if err != nil {
-		return nil, err
-	}
-
-	return bufio.NewScanner(bytes.NewReader(data)), nil
-}
-
-func consumeString(scanner *bufio.Scanner) (string, error) {
-	for scanner.Scan() {
-		line := scanner.Bytes()
-
-		if len(line) == 0 || line[0] == hashComment[0] { // Most .dat files use # for comments
-			continue
-		}
-
-		comment := bytes.Index(line, hashComment)
-		if comment > 0 {
-			line = line[0:comment]
-		}
-
-		return string(bytes.TrimRight(line, "\r\n\t ")), nil
-	}
-
-	err := scanner.Err()
-	if err == nil {
-		return "", io.EOF
-	}
-
-	return "", err
-}
-
-func consumeInt(scanner *bufio.Scanner) (int, error) {
-	str, err := consumeString(scanner)
-	if err != nil {
-		return 0, err
-	}
-
-	return strconv.Atoi(str)
-}
-
-func consumeIntPtr(to *int, scanner *bufio.Scanner) error {
-	val, err := consumeInt(scanner)
-	if err != nil {
-		return err
-	}
-
-	*to = val
-	return nil
-}
-
-func consumeIntPtrs(scanner *bufio.Scanner, ptrs ...*int) error {
-	for _, ptr := range ptrs {
-		if err := consumeIntPtr(ptr, scanner); err != nil {
-			return err
-		}
-	}
-
-	return nil
-}
-
-func consumeRange(scanner *bufio.Scanner) (Range, error) {
+func consumeRange(scanner *asciiscan.Scanner) (Range, error) {
 	var out Range
 
-	err := consumeIntPtrs(scanner, &out.Start, &out.End)
+	err := scanner.ConsumeIntPtrs(&out.Start, &out.End)
 	return out, err
 }
 
-func consumeCompassPoints(scanner *bufio.Scanner) (CompassPoints, error) {
+func consumeCompassPoints(scanner *asciiscan.Scanner) (CompassPoints, error) {
 	var out CompassPoints
 
-	err := consumeIntPtrs(
-		scanner,
+	err := scanner.ConsumeIntPtrs(
 		&out.N, &out.NE, &out.E, &out.SE, &out.S, &out.SW, &out.W, &out.NW,
 	)
 

internal/data/generic.go

@@ -1,5 +1,9 @@
 package data
 
+import (
+	"ur.gs/chaos-gate/internal/util/asciiscan"
+)
+
 type ActionPointEnum int
 type SettingEnum int
 type TransitionFrameEnum int
@@ -205,10 +209,11 @@ type Generic struct {
 
 // TODO: consume these values from the file
 func LoadGeneric(filename string) (*Generic, error) {
-	scanLines, err := fileToScanner(filename)
+	s, err := asciiscan.New(filename)
 	if err != nil {
 		return nil, err
 	}
+	defer s.Close()
 
 	out := &Generic{
 		ActionPoints:                make(map[ActionPointEnum]int),
@@ -224,7 +229,7 @@ func LoadGeneric(filename string) (*Generic, error) {
 
 	// Various action point values, first to last
 	for ap := ActionPointEnum(0); ap < APMax; ap++ {
-		val, err := consumeInt(scanLines)
+		val, err := s.ConsumeInt()
 		if err != nil {
 			return nil, err
 		}
@@ -234,7 +239,7 @@ func LoadGeneric(filename string) (*Generic, error) {
 
 	// Other miscellaneous data fields, first to last
 	for setting := SettingEnum(0); setting < SettingMax; setting++ {
-		val, err := consumeInt(scanLines)
+		val, err := s.ConsumeInt()
 		if err != nil {
 			return nil, err
 		}
@@ -244,7 +249,7 @@ func LoadGeneric(filename string) (*Generic, error) {
 
 	// Vehicle walk transition frames. Whatever they are.
 	for tf := TransitionFrameEnum(0); tf < TFMax; tf++ {
-		val, err := consumeCompassPoints(scanLines)
+		val, err := consumeCompassPoints(s)
 		if err != nil {
 			return nil, err
 		}
@@ -253,7 +258,7 @@ func LoadGeneric(filename string) (*Generic, error) {
 	}
 
 	for st := SquadTypeEnum(0); st < SquadMax; st++ {
-		val, err := consumeInt(scanLines)
+		val, err := s.ConsumeInt()
 		if err != nil {
 			return nil, err
 		}
@@ -262,7 +267,7 @@ func LoadGeneric(filename string) (*Generic, error) {
 	}
 
 	for vt := VehicleTypeEnum(0); vt < VehicleMax; vt++ {
-		val, err := consumeInt(scanLines)
+		val, err := s.ConsumeInt()
 		if err != nil {
 			return nil, err
 		}
@@ -271,7 +276,7 @@ func LoadGeneric(filename string) (*Generic, error) {
 	}
 
 	for op := OptionEnum(0); op < OptionMax; op++ {
-		val, err := consumeInt(scanLines)
+		val, err := s.ConsumeInt()
 		if err != nil {
 			return nil, err
 		}
@@ -280,7 +285,7 @@ func LoadGeneric(filename string) (*Generic, error) {
 	}
 
 	for i := 0; i < NumCampaignScenarios; i++ {
-		val, err := consumeString(scanLines)
+		val, err := s.ConsumeString()
 		if err != nil {
 			return nil, err
 		}
@@ -289,7 +294,7 @@ func LoadGeneric(filename string) (*Generic, error) {
 	}
 
 	for i := 0; i < NumCampaignScenarios; i++ {
-		val, err := consumeString(scanLines)
+		val, err := s.ConsumeString()
 		if err != nil {
 			return nil, err
 		}
@@ -298,13 +303,13 @@ func LoadGeneric(filename string) (*Generic, error) {
 		out.CampaignEndMissionWavs = append(out.CampaignEndMissionWavs, val)
 	}
 
-	out.AICoherentForce, err = consumeInt(scanLines)
+	out.AICoherentForce, err = s.ConsumeInt()
 	if err != nil {
 		return nil, err
 	}
 
 	for sp := SpellEnum(0); sp < SpellMax; sp++ {
-		val, err := consumeInt(scanLines)
+		val, err := s.ConsumeInt()
 		if err != nil {
 			return nil, err
 		}
@@ -313,7 +318,7 @@ func LoadGeneric(filename string) (*Generic, error) {
 	}
 
 	for ai := AIPriorityEnum(0); ai < AIPriorityMax; ai++ {
-		val, err := consumeInt(scanLines)
+		val, err := s.ConsumeInt()
 		if err != nil {
 			return nil, err
 		}
@@ -321,13 +326,13 @@ func LoadGeneric(filename string) (*Generic, error) {
 		out.AIPriority[ai] = val
 	}
 
-	out.AICommandInfiniteLoopCounterWatermark, err = consumeInt(scanLines)
+	out.AICommandInfiniteLoopCounterWatermark, err = s.ConsumeInt()
 	if err != nil {
 		return nil, err
 	}
 
 	for rg := RngRangeEnum(0); rg < RngRangeMax; rg++ {
-		val, err := consumeRange(scanLines)
+		val, err := consumeRange(s)
 		if err != nil {
 			return nil, err
 		}

internal/util/asciiscan/asciiscan.go

@@ -0,0 +1,90 @@
+// package asciiscan is used to parse plaintext files into structured data
+package asciiscan
+
+import (
+	"bufio"
+	"bytes"
+	"io"
+	"os"
+	"strconv"
+)
+
+var hashComment = []byte("#")
+
+type Scanner struct {
+	bufio  *bufio.Scanner
+	closer io.Closer
+}
+
+func New(filename string) (*Scanner, error) {
+	f, err := os.Open(filename)
+	if err != nil {
+		return nil, err
+	}
+
+	return &Scanner{
+		bufio:  bufio.NewScanner(f),
+		closer: f,
+	}, nil
+}
+
+func (s *Scanner) Bufio() *bufio.Scanner {
+	return s.bufio
+}
+
+func (s *Scanner) Close() error {
+	return s.closer.Close()
+}
+
+func (s *Scanner) ConsumeString() (string, error) {
+	for s.bufio.Scan() {
+		line := s.bufio.Bytes()
+
+		if len(line) == 0 || line[0] == hashComment[0] { // Most .dat files use # for comments
+			continue
+		}
+
+		comment := bytes.Index(line, hashComment)
+		if comment > 0 {
+			line = line[0:comment]
+		}
+
+		return string(bytes.TrimRight(line, "\r\n\t ")), nil
+	}
+
+	err := s.bufio.Err()
+	if err == nil {
+		return "", io.EOF
+	}
+
+	return "", err
+}
+
+func (s *Scanner) ConsumeInt() (int, error) {
+	str, err := s.ConsumeString()
+	if err != nil {
+		return 0, err
+	}
+
+	return strconv.Atoi(str)
+}
+
+func (s *Scanner) ConsumeIntPtr(to *int) error {
+	val, err := s.ConsumeInt()
+	if err != nil {
+		return err
+	}
+
+	*to = val
+	return nil
+}
+
+func (s *Scanner) ConsumeIntPtrs(ptrs ...*int) error {
+	for _, ptr := range ptrs {
+		if err := s.ConsumeIntPtr(ptr); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}