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Started working on multiple filename arguments; prefix each line with filename containing the line; mostly indentation changes

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master
Aadhavan Srinivasan 2 months ago
parent e79c19a929
commit 34149980a4
1 changed files with 152 additions and 132 deletions
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284
cmd/main.go
Unescape Escape View File

@ -6,6 +6,7 @@ import (
"fmt"
"io"
"os"
"slices"
"github.com/fatih/color"
@ -25,6 +26,7 @@ func main() {
multiLineFlag := flag.Bool("t", false, "Multi-line mode. Treats newline just like any character.")
printMatchesFlag := flag.Bool("p", false, "Prints start and end index of each match. Can only be used with '-t' for multi-line mode.")
caseInsensitiveFlag := flag.Bool("i", false, "Case-insensitive. Disregard the case of all characters.")
recursiveFlag := flag.Bool("r", false, "Recursively search all files in the given directory.")
matchNum := flag.Int("m", 0, "Print the match with the given index. Eg. -m 3 prints the third match.")
substituteText := flag.String("s", "", "Substitute the contents of each match with the given string. Overrides -o and -v")
flag.Parse()
@ -64,21 +66,30 @@ func main() {
// 2. Build NFA from postfix representation (Thompson's algorithm)
// 3. Run the string against the NFA
if len(flag.Args()) < 1 || len(flag.Args()) > 2 { // flag.Args() also strips out program name
if len(flag.Args()) < 1 { // flag.Args() also strips out program name
fmt.Println("ERROR: Missing cmdline args")
os.Exit(22)
}
if *recursiveFlag && len(flag.Args()) < 2 { // File/Directory must be provided with '-r'
fmt.Println("ERROR: Missing cmdline args")
os.Exit(22)
}
var re string
re = flag.Args()[0]
var inputFile *os.File
var inputFiles []*os.File
if len(flag.Args()) == 1 || flag.Args()[1] == "-" { // Either no file argument, or file argument is "-"
inputFile = os.Stdin
if !slices.Contains(inputFiles, os.Stdin) {
inputFiles = append(inputFiles, os.Stdin) // os.Stdin cannot be entered more than once into the file list
}
} else {
var err error
inputFile, err = os.Open(flag.Args()[1])
if err != nil {
fmt.Printf("%s: No such file or directory\n", flag.Args()[1])
os.Exit(2)
inputFilenames := flag.Args()[1:]
for _, inputFilename := range inputFilenames {
inputFile, err := os.Open(inputFilename)
if err != nil {
fmt.Printf("%s: No such file or directory\n", flag.Args()[1])
os.Exit(2)
}
inputFiles = append(inputFiles, inputFile)
}
}
@ -86,160 +97,169 @@ func main() {
var err error
var linesRead bool // Whether or not we have read the lines in the file
lineNum := 0 // Current line number
// Create reader for stdin and writer for stdout
reader := bufio.NewReader(inputFile)
// Create writer for stdout
out := bufio.NewWriter(os.Stdout)
// Compile regex
regComp, err := reg.Compile(re, flagsToCompile...)
if err != nil {
fmt.Println(err)
return
}
for true {
if linesRead {
break
}
if !(*multiLineFlag) {
// Read every string from stdin until we encounter an error. If the error isn't EOF, panic.
test_str, err = reader.ReadString('\n')
lineNum++
if err != nil {
for _, inputFile := range inputFiles {
reader := bufio.NewReader(inputFile)
linesRead = false
for true {
if !(*lineFlag) && (!*onlyFlag) {
color.New(color.FgMagenta).Fprintf(out, "%s: ", inputFile.Name()) // The filename should be printed for every line, _except_ if we're not printing every line. This is the case with the lineFlag and onlyFlag
}
if linesRead {
break
}
if !(*multiLineFlag) {
// Read every string from stdin until we encounter an error. If the error isn't EOF, panic.
test_str, err = reader.ReadString('\n')
lineNum++
if err != nil {
if err == io.EOF {
linesRead = true
} else {
panic(err)
}
}
if len(test_str) > 0 && test_str[len(test_str)-1] == '\n' {
test_str = test_str[:len(test_str)-1]
}
} else {
// Multi-line mode - read every line of input into a temp. string.
// test_str will contain all lines of input (including newline characters)
// as one string.
var temp string
for temp, err = reader.ReadString('\n'); err == nil; temp, err = reader.ReadString('\n') {
test_str += temp
}
// Assuming err != nil
if err == io.EOF {
if len(temp) > 0 {
test_str += temp // Add the last line (if it is non-empty)
}
linesRead = true
} else {
panic(err)
}
}
if len(test_str) > 0 && test_str[len(test_str)-1] == '\n' {
test_str = test_str[:len(test_str)-1]
}
} else {
// Multi-line mode - read every line of input into a temp. string.
// test_str will contain all lines of input (including newline characters)
// as one string.
var temp string
for temp, err = reader.ReadString('\n'); err == nil; temp, err = reader.ReadString('\n') {
test_str += temp
}
// Assuming err != nil
if err == io.EOF {
if len(temp) > 0 {
test_str += temp // Add the last line (if it is non-empty)
matchIndices := make([]reg.Match, 0)
if matchNumFlagEnabled {
tmp, err := regComp.FindNthMatch(test_str, *matchNum)
if err == nil {
matchIndices = append(matchIndices, tmp)
}
linesRead = true
} else {
panic(err)
}
}
matchIndices := make([]reg.Match, 0)
if matchNumFlagEnabled {
tmp, err := regComp.FindNthMatch(test_str, *matchNum)
if err == nil {
matchIndices = append(matchIndices, tmp)
matchIndices = regComp.FindAllSubmatch(test_str)
}
} else {
matchIndices = regComp.FindAllSubmatch(test_str)
}
test_str_runes := []rune(test_str) // Converting to runes preserves unicode characters
test_str_runes := []rune(test_str) // Converting to runes preserves unicode characters
if *printMatchesFlag {
// if we are in single line mode, print the line on which
// the matches occur
if len(matchIndices) > 0 {
if !(*multiLineFlag) {
fmt.Fprintf(out, "Line %d:\n", lineNum)
}
for _, m := range matchIndices {
fmt.Fprintf(out, "%s\n", m.String())
}
err := out.Flush()
if err != nil {
panic(err)
if *printMatchesFlag {
// if we are in single line mode, print the line on which
// the matches occur
if len(matchIndices) > 0 {
if !(*multiLineFlag) {
fmt.Fprintf(out, "Line %d:\n", lineNum)
}
for _, m := range matchIndices {
fmt.Fprintf(out, "%s\n", m.String())
}
err := out.Flush()
if err != nil {
panic(err)
}
}
continue
}
continue
}
// Decompose the array of matchIndex structs into a flat unique array of ints - if matchIndex is {4,7}, flat array will contain 4,5,6
// This should make checking O(1) instead of O(n)
indicesToPrint := new_uniq_arr[int]()
for _, idx := range matchIndices {
indicesToPrint.add(genRange(idx[0].StartIdx, idx[0].EndIdx)...)
}
// If we are inverting, then we should print the indices which _didn't_ match
// in color.
if *invertFlag {
oldIndices := indicesToPrint.values()
indicesToPrint = new_uniq_arr[int]()
// Explanation:
// Find all numbers from 0 to len(test_str_runes) that are NOT in oldIndices.
// These are the values we want to print, now that we have inverted the match.
// Re-initialize indicesToPrint and add all of these values to it.
indicesToPrint.add(setDifference(genRange(0, len(test_str_runes)), oldIndices)...)
// Decompose the array of matchIndex structs into a flat unique array of ints - if matchIndex is {4,7}, flat array will contain 4,5,6
// This should make checking O(1) instead of O(n)
indicesToPrint := new_uniq_arr[int]()
for _, idx := range matchIndices {
indicesToPrint.add(genRange(idx[0].StartIdx, idx[0].EndIdx)...)
}
// If we are inverting, then we should print the indices which _didn't_ match
// in color.
if *invertFlag {
oldIndices := indicesToPrint.values()
indicesToPrint = new_uniq_arr[int]()
// Explanation:
// Find all numbers from 0 to len(test_str_runes) that are NOT in oldIndices.
// These are the values we want to print, now that we have inverted the match.
// Re-initialize indicesToPrint and add all of these values to it.
indicesToPrint.add(setDifference(genRange(0, len(test_str_runes)), oldIndices)...)
}
// If lineFlag is enabled, we should only print something if:
// a. We are not inverting, and have at least one match on the current line
// OR
// b. We are inverting, and have no matches at all on the current line.
// This checks for the inverse, and continues if it is true.
if *lineFlag {
if !(*invertFlag) && len(matchIndices) == 0 || *invertFlag && len(matchIndices) > 0 {
continue
}
}
// If lineFlag is enabled, we should only print something if:
// a. We are not inverting, and have at least one match on the current line
// OR
// b. We are inverting, and have no matches at all on the current line.
// This checks for the inverse, and continues if it is true.
if *lineFlag {
if !(*invertFlag) && len(matchIndices) == 0 || *invertFlag && len(matchIndices) > 0 {
continue
} else {
color.New(color.FgMagenta).Fprintf(out, "%s: ", inputFile.Name()) // Print filename
}
}
// If we are substituting, we need a different behavior, as follows:
// For every character in the test string:
// 1. Check if the index is the start of any matchIndex
// 2. If so, print the substitute text, and set our index to
// the corresponding end index.
// 3. If not, just print the character.
if substituteFlagEnabled {
for i := range test_str_runes {
inMatchIndex := false
for _, m := range matchIndices {
if i == m[0].StartIdx {
fmt.Fprintf(out, "%s", *substituteText)
i = m[0].EndIdx
inMatchIndex = true
break
// If we are substituting, we need a different behavior, as follows:
// For every character in the test string:
// 1. Check if the index is the start of any matchIndex
// 2. If so, print the substitute text, and set our index to
// the corresponding end index.
// 3. If not, just print the character.
if substituteFlagEnabled {
for i := range test_str_runes {
inMatchIndex := false
for _, m := range matchIndices {
if i == m[0].StartIdx {
fmt.Fprintf(out, "%s", *substituteText)
i = m[0].EndIdx
inMatchIndex = true
break
}
}
if !inMatchIndex {
fmt.Fprintf(out, "%c", test_str_runes[i])
}
}
if !inMatchIndex {
fmt.Fprintf(out, "%c", test_str_runes[i])
}
}
} else {
for i, c := range test_str_runes {
if indicesToPrint.contains(i) {
color.New(color.FgRed).Fprintf(out, "%c", c)
// Newline after every match - only if -o is enabled and -v is disabled.
if *onlyFlag && !(*invertFlag) {
for matchIdxNum, idx := range matchIndices {
if matchIdxNum < len(matchIndices)-1 { // Only print a newline afte printing a match, if there are multiple matches on the line, and we aren't on the last one. This is because the newline that gets added at the end will take care of that.
if i+1 == idx[0].EndIdx { // End index is one more than last index of match
fmt.Fprintf(out, "\n")
break
} else {
for i, c := range test_str_runes {
if indicesToPrint.contains(i) {
color.New(color.FgRed, color.Bold).Fprintf(out, "%c", c)
// Newline after every match - only if -o is enabled and -v is disabled.
if *onlyFlag && !(*invertFlag) {
for matchIdxNum, idx := range matchIndices {
if matchIdxNum < len(matchIndices)-1 { // Only print a newline afte printing a match, if there are multiple matches on the line, and we aren't on the last one. This is because the newline that gets added at the end will take care of that.
if i+1 == idx[0].EndIdx { // End index is one more than last index of match
fmt.Fprintf(out, "\n")
break
}
}
}
}
}
} else {
if !(*onlyFlag) {
fmt.Fprintf(out, "%c", c)
} else {
if !(*onlyFlag) {
fmt.Fprintf(out, "%c", c)
}
}
}
}
}
err = out.Flush()
if err != nil {
panic(err)
}
// If the last character in the string wasn't a newline, AND we either have don't -o set or we do (and we've matched something), then print a newline
if (len(test_str_runes) > 0 && test_str_runes[len(test_str_runes)-1] != '\n') &&
(!*onlyFlag || indicesToPrint.len() > 0) {
fmt.Println()
err = out.Flush()
if err != nil {
panic(err)
}
// If the last character in the string wasn't a newline, AND we either have don't -o set or we do (and we've matched something), then print a newline
if (len(test_str_runes) > 0 && test_str_runes[len(test_str_runes)-1] != '\n') &&
(!*onlyFlag || indicesToPrint.len() > 0) {
fmt.Println()
}
}
}
}

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