Restructured code into 'cmd' module with CLI and 'greg' module with regex library; export necessary struct fields and methods

cmd/main.go

@@ -8,11 +8,13 @@ import (
 	"os"
 
 	"github.com/fatih/color"
+
+	"gitea.twomorecents.org/Rockingcool/kg/greg"
 )
 
 func main() {
 	// Flags for the regex Compile function
-	flagsToCompile := make([]ReFlag, 0)
+	flagsToCompile := make([]greg.ReFlag, 0)
 
 	invertFlag := flag.Bool("v", false, "Invert match.")
 	// This flag has two 'modes':
@@ -29,10 +31,10 @@ func main() {
 
 	// These flags have to be passed to the Compile function
 	if *multiLineFlag {
-		flagsToCompile = append(flagsToCompile, RE_MULTILINE, RE_SINGLE_LINE)
+		flagsToCompile = append(flagsToCompile, greg.RE_MULTILINE, greg.RE_SINGLE_LINE)
 	}
 	if *caseInsensitiveFlag {
-		flagsToCompile = append(flagsToCompile, RE_CASE_INSENSITIVE)
+		flagsToCompile = append(flagsToCompile, greg.RE_CASE_INSENSITIVE)
 	}
 
 	// -l and -o are mutually exclusive: -o overrides -l

go.mod

@@ -1,4 +1,4 @@
-module re
+module gitea.twomorecents.org/Rockingcool/kg
 
 go 1.23.1
 

greg/compile.go

@@ -1,4 +1,4 @@
-package main
+package greg
 
 import (
 	"fmt"

greg/matching.go

@@ -1,4 +1,4 @@
-package main
+package greg
 
 import (
 	"fmt"
@@ -10,15 +10,15 @@ type Match []Group
 
 // a Group represents a group. It contains the start index and end index of the match
 type Group struct {
-	startIdx int
+	StartIdx int
-	endIdx   int
+	EndIdx   int
 }
 
 func newMatch(size int) Match {
 	toRet := make([]Group, size)
 	for i := range toRet {
-		toRet[i].startIdx = -1
+		toRet[i].StartIdx = -1
-		toRet[i].endIdx = -1
+		toRet[i].EndIdx = -1
 	}
 	return toRet
 }
@@ -27,7 +27,7 @@ func newMatch(size int) Match {
 func (m Match) numValidGroups() int {
 	numValid := 0
 	for _, g := range m {
-		if g.startIdx >= 0 && g.endIdx >= 0 {
+		if g.StartIdx >= 0 && g.EndIdx >= 0 {
 			numValid++
 		}
 	}
@@ -35,7 +35,7 @@ func (m Match) numValidGroups() int {
 }
 
 // Returns a string containing the indices of all (valid) groups in the match
-func (m Match) toString() string {
+func (m Match) ToString() string {
 	var toRet string
 	for i, g := range m {
 		if g.isValid() {
@@ -49,12 +49,12 @@ func (m Match) toString() string {
 
 // Converts the Group into a string representation:
 func (idx Group) toString() string {
-	return fmt.Sprintf("%d\t%d", idx.startIdx, idx.endIdx)
+	return fmt.Sprintf("%d\t%d", idx.StartIdx, idx.EndIdx)
 }
 
 // Returns whether a group contains valid indices
 func (g Group) isValid() bool {
-	return g.startIdx >= 0 && g.endIdx >= 0
+	return g.StartIdx >= 0 && g.EndIdx >= 0
 }
 
 // takeZeroState takes the 0-state (if such a transition exists) for all states in the
@@ -70,11 +70,11 @@ func takeZeroState(states []*State, numGroups int, idx int) (rtv []*State, isZer
 				}
 				copy(s.threadGroups, state.threadGroups)
 				if s.groupBegin {
-					s.threadGroups[s.groupNum].startIdx = idx
+					s.threadGroups[s.groupNum].StartIdx = idx
 					//					openParenGroups = append(openParenGroups, s.groupNum)
 				}
 				if s.groupEnd {
-					s.threadGroups[s.groupNum].endIdx = idx
+					s.threadGroups[s.groupNum].EndIdx = idx
 					//					closeParenGroups = append(closeParenGroups, s.groupNum)
 				}
 			}
@@ -118,17 +118,17 @@ func zeroMatchPossible(str []rune, idx int, numGroups int, states ...*State) boo
 func pruneIndices(indices []Match) []Match {
 	// First, sort the slice by the start indices
 	sort.Slice(indices, func(i, j int) bool {
-		return indices[i][0].startIdx < indices[j][0].startIdx
+		return indices[i][0].StartIdx < indices[j][0].StartIdx
 	})
 	toRet := make([]Match, 0, len(indices))
 	current := indices[0]
 	for _, idx := range indices[1:] {
 		// idx doesn't overlap with current (starts after current ends), so add current to result
 		// and update the current.
-		if idx[0].startIdx >= current[0].endIdx {
+		if idx[0].StartIdx >= current[0].EndIdx {
 			toRet = append(toRet, current)
 			current = idx
-		} else if idx[0].endIdx > current[0].endIdx {
+		} else if idx[0].EndIdx > current[0].EndIdx {
 			// idx overlaps, but it is longer, so update current
 			current = idx
 		}
@@ -147,7 +147,7 @@ func FindString(regex Reg, str string) string {
 	if err != nil {
 		return ""
 	}
-	return str[match[0].startIdx:match[0].endIdx]
+	return str[match[0].StartIdx:match[0].EndIdx]
 }
 
 // FindAllString is the 'all' version of FindString.
@@ -247,7 +247,7 @@ func findAllMatchesHelper(start *State, str []rune, offset int, numGroups int) (
 	start.threadGroups = newMatch(numGroups + 1)
 	// Check if the start state begins a group - if so, add the start index to our list
 	if start.groupBegin {
-		start.threadGroups[start.groupNum].startIdx = i
+		start.threadGroups[start.groupNum].StartIdx = i
 		//		tempIndices[start.groupNum].startIdx = i
 	}
 
@@ -356,10 +356,10 @@ func findAllMatchesHelper(start *State, str []rune, offset int, numGroups int) (
 			//	i++
 			//			}
 			if tempIndices.numValidGroups() > 0 && tempIndices[0].isValid() {
-				if tempIndices[0].startIdx == tempIndices[0].endIdx { // If we have a zero-length match, we have to shift the index at which we start. Otherwise we keep looking at the same paert of the string over and over.
+				if tempIndices[0].StartIdx == tempIndices[0].EndIdx { // If we have a zero-length match, we have to shift the index at which we start. Otherwise we keep looking at the same paert of the string over and over.
-					return true, tempIndices, tempIndices[0].endIdx + 1
+					return true, tempIndices, tempIndices[0].EndIdx + 1
 				} else {
-					return true, tempIndices, tempIndices[0].endIdx
+					return true, tempIndices, tempIndices[0].EndIdx
 				}
 			}
 			return false, []Group{}, startIdx
@@ -402,10 +402,10 @@ func findAllMatchesHelper(start *State, str []rune, offset int, numGroups int) (
 	}
 
 	if tempIndices.numValidGroups() > 0 {
-		if tempIndices[0].startIdx == tempIndices[0].endIdx { // If we have a zero-length match, we have to shift the index at which we start. Otherwise we keep looking at the same paert of the string over and over.
+		if tempIndices[0].StartIdx == tempIndices[0].EndIdx { // If we have a zero-length match, we have to shift the index at which we start. Otherwise we keep looking at the same paert of the string over and over.
-			return true, tempIndices, tempIndices[0].endIdx + 1
+			return true, tempIndices, tempIndices[0].EndIdx + 1
 		} else {
-			return true, tempIndices, tempIndices[0].endIdx
+			return true, tempIndices, tempIndices[0].EndIdx
 		}
 	}
 	if startIdx == startingFrom { // Increment starting index if we haven't moved in the string. Prevents us from matching the same part of the string over and over.

greg/misc.go

@@ -1,4 +1,4 @@
-package main
+package greg
 
 import (
 	"slices"

greg/nfa.go

@@ -1,4 +1,4 @@
-package main
+package greg
 
 import (
 	"fmt"

greg/postfixNode.go

@@ -1,4 +1,4 @@
-package main
+package greg
 
 import "fmt"
 

greg/range2regex.go

@@ -1,4 +1,4 @@
-package main
+package greg
 
 import (
 	"fmt"

greg/re_test.go

@@ -1,4 +1,4 @@
-package main
+package greg
 
 import (
 	"fmt"
@@ -703,7 +703,7 @@ func TestFindString(t *testing.T) {
 						t.Errorf("Expected no match got %v\n", foundString)
 					}
 				} else {
-					expectedString := test.str[test.result[0].startIdx:test.result[0].endIdx]
+					expectedString := test.str[test.result[0].StartIdx:test.result[0].EndIdx]
 					if foundString != expectedString {
 						t.Errorf("Wanted %v	Got %v\n", expectedString, foundString)
 					}

greg/sliceQueue.go

@@ -1,4 +1,4 @@
-package main
+package greg
 
 import "errors"
 

greg/stateContents.go

@@ -1,4 +1,4 @@
-package main
+package greg
 
 type stateContents []int // Represents the contents of the current state - character classes can have multiple contents, which is why it is represented as a slice