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CSVReader.m
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//
// CSVReader.m
// Table Tool
//
// Created by Andreas Aigner on 09.07.15.
// Copyright (c) 2015 Egger Apps. All rights reserved.
//
#import "CSVReader.h"
@interface CSVReader () {
NSScanner *dataScanner;
NSString *dataString;
NSMutableCharacterSet *newlineCharacterSet;
NSMutableCharacterSet *quoteEndedCharacterSet;
NSMutableCharacterSet *quoteAndEscapeSet;
BOOL unquoted;
NSRegularExpression *regex;
NSString *errorCode1;
NSString *errorCode2;
NSString *errorCode3;
}
@end
@implementation CSVReader
-(instancetype)initWithData:(NSData *)data configuration:(CSVConfiguration *)config{
self = [super init];
if(self) {
_data = data;
[self initVariables:config];
}
return self;
}
-(instancetype)initWithString:(NSString *)newDataString configuration:(CSVConfiguration *)config{
self = [super init];
if(self) {
dataString = newDataString;
[self initVariables:config];
}
return self;
}
-(void)initVariables:(CSVConfiguration *)config{
_config = config.copy;
if([_config.quoteCharacter isEqualToString:@""]) unquoted = YES;
_atEnd = NO;
errorCode1 = @"Try specifying a different encoding.";
errorCode2 = @"Try specifying a different separator or quote.";
errorCode3 = errorCode2;
}
-(BOOL)initScannerWithError:(NSError **)outError skipQuotes:(BOOL)skip{
if(!dataScanner){
if(skip){
_config.columnSeparator = @"\t";
_config.quoteCharacter = @"";
_config.decimalMark = [[NSLocale currentLocale] objectForKey:NSLocaleDecimalSeparator];
}
if(!dataString){
dataString = [[NSString alloc] initWithData:_data encoding:_config.encoding];
}
if(!dataString) {
if(outError != NULL) {
*outError = [NSError errorWithDomain:@"at.eggerapps.Table-Tool" code:1 userInfo: @{NSLocalizedDescriptionKey: @"Could not read data", NSLocalizedRecoverySuggestionErrorKey:errorCode1}];
}
return NO;
}
dataScanner = [NSScanner scannerWithString:dataString];
dataScanner.caseSensitive = YES;
dataScanner.charactersToBeSkipped = nil;
newlineCharacterSet = [NSCharacterSet newlineCharacterSet].mutableCopy;
[newlineCharacterSet removeCharactersInString:@"\x0b\x0c"];
quoteEndedCharacterSet = newlineCharacterSet.mutableCopy;
[quoteEndedCharacterSet addCharactersInString:_config.columnSeparator];
quoteAndEscapeSet = [[NSMutableCharacterSet alloc]init];
[quoteAndEscapeSet addCharactersInString:_config.quoteCharacter];
[quoteAndEscapeSet addCharactersInString:_config.escapeCharacter];
regex = [NSRegularExpression regularExpressionWithPattern:[NSString stringWithFormat:@"^\\s*[+-]?(\\d+\\%@?\\d*|\\d*\\%@?\\d+)([eE][+-]?\\d+)?\\s*$",_config.decimalMark,_config.decimalMark] options:0 error:NULL];
}
return YES;
}
-(NSArray *)readLineWithError:(NSError *__autoreleasing *)outError {
NSError *scannerError = nil;
BOOL didInitializeScanner = [self initScannerWithError:&scannerError skipQuotes:NO];
if(!didInitializeScanner) {
if(outError){
*outError = scannerError;
}
return nil;
}
NSMutableArray *rowArray = [[NSMutableArray alloc]init];
while(!_atEnd){
NSString *scannedString = nil;
NSError *scanError = nil;
BOOL didScan = NO;
if(!unquoted){
didScan = [self scanQuotedValueIntoString:&scannedString error:&scanError];
}
if((!didScan && scanError == nil)){
didScan = [self scanUnquotedValueIntoString:&scannedString error:&scanError];
}
if(!didScan) {
if(outError){
*outError = scanError;
}
return nil;
}
if(scannedString.length > 0 && [regex numberOfMatchesInString:scannedString options:0 range:NSMakeRange(0, [scannedString length])] == 1){
[rowArray addObject:[NSDecimalNumber decimalNumberWithString:scannedString locale:@{NSLocaleDecimalSeparator:_config.decimalMark}]];
}else{
[rowArray addObject:scannedString];
}
if(dataScanner.isAtEnd){
_atEnd = YES;
break;
}
if([newlineCharacterSet characterIsMember:[dataString characterAtIndex:dataScanner.scanLocation]]){
dataScanner.scanLocation++;
if(dataScanner.isAtEnd) _atEnd = YES;
break;
}
//scanning column separator
dataScanner.scanLocation++;
}
if (_atEnd && !rowArray.count) {
return nil;
}
return rowArray;
}
-(NSArray *)readLineForPastingTo:(NSArray *)tableColumnsOrder maxColumnIndex:(long)maxColumnNumber {
[self initScannerWithError:NULL skipQuotes:YES];
NSMutableArray *rowArray = [[NSMutableArray alloc]init];
for(int i = 0; i < maxColumnNumber; i++){
[rowArray addObject:@""];
}
for(int i = 0;;i++) {
NSString *scannedString = nil;
BOOL scannedValueIsNumber = NO;
[self scanUnquotedValueIntoString:&scannedString error:NULL];
if([regex numberOfMatchesInString:scannedString options:0 range:NSMakeRange(0, [scannedString length])] == 1){
scannedValueIsNumber = YES;
}
if(tableColumnsOrder.count > i){
if(scannedValueIsNumber){
[rowArray replaceObjectAtIndex:[tableColumnsOrder[i] integerValue] withObject:[NSDecimalNumber decimalNumberWithString:scannedString locale:@{NSLocaleDecimalSeparator:_config.decimalMark}]];
}else{
[rowArray replaceObjectAtIndex:[tableColumnsOrder[i] integerValue] withObject:scannedString];
}
} else {
if(scannedValueIsNumber){
[rowArray addObject:[NSDecimalNumber decimalNumberWithString:scannedString locale:@{NSLocaleDecimalSeparator:_config.decimalMark}]];
}else{
[rowArray addObject:scannedString];
}
}
if(dataScanner.isAtEnd){
_atEnd = YES;
break;
}
if([newlineCharacterSet characterIsMember:[dataString characterAtIndex:dataScanner.scanLocation]]){
dataScanner.scanLocation++;
break;
}
//scanning column separator
dataScanner.scanLocation++;
}
return rowArray;
}
-(BOOL)scanQuotedValueIntoString:(NSString **)scannedString error:(NSError**)outError {
if(dataScanner.isAtEnd) {
*scannedString = @"";
return YES;
}
if([dataString characterAtIndex:dataScanner.scanLocation] != '\"'){
return NO;
}
NSMutableString *temporaryString = [[NSMutableString alloc] init];
dataScanner.scanLocation++;
while(!dataScanner.isAtEnd){
while(!dataScanner.isAtEnd && ![quoteAndEscapeSet characterIsMember:[dataString characterAtIndex:dataScanner.scanLocation]]){
[temporaryString appendString:[dataString substringWithRange:NSMakeRange(dataScanner.scanLocation, 1)]];
dataScanner.scanLocation++;
}
if(dataScanner.isAtEnd){
if(outError != NULL) {
*outError = [NSError errorWithDomain:@"at.eggerapps.Table-Tool" code:2 userInfo:@{NSLocalizedDescriptionKey: @"Could not read data", NSLocalizedRecoverySuggestionErrorKey:errorCode2}];
}
return NO;
}
if([dataString characterAtIndex:dataScanner.scanLocation] == [_config.escapeCharacter characterAtIndex:0]) {
if([_config.escapeCharacter isEqualToString:_config.quoteCharacter]){
if((dataScanner.scanLocation+2 <= dataString.length && [quoteEndedCharacterSet characterIsMember:[dataString characterAtIndex:dataScanner.scanLocation+1]]) || dataScanner.scanLocation+1 == dataString.length){
dataScanner.scanLocation++;
*scannedString = temporaryString;
[self checkForCRLF];
return YES;
}
}
dataScanner.scanLocation++;
if(dataScanner.isAtEnd){
if(outError != NULL) {
*outError = [NSError errorWithDomain:@"at.eggerapps.Table-Tool" code:2 userInfo:@{NSLocalizedDescriptionKey: @"Could not read data", NSLocalizedRecoverySuggestionErrorKey:errorCode2}];
}
return NO;
}
[temporaryString appendString:[dataString substringWithRange:NSMakeRange(dataScanner.scanLocation,1)]];
dataScanner.scanLocation++;
continue;
}
if([dataString characterAtIndex:dataScanner.scanLocation] == [_config.quoteCharacter characterAtIndex:0]) {
dataScanner.scanLocation++;
if(dataScanner.isAtEnd || [quoteEndedCharacterSet characterIsMember:[dataString characterAtIndex:dataScanner.scanLocation]]){
*scannedString = temporaryString;
[self checkForCRLF];
return YES;
}
if(outError != NULL) {
*outError = [NSError errorWithDomain:@"at.eggerapps.Table-Tool" code:2 userInfo:@{NSLocalizedDescriptionKey: @"Could not read data", NSLocalizedRecoverySuggestionErrorKey:errorCode2}];
}
return NO;
}
}
if(outError != NULL) {
*outError = [NSError errorWithDomain:@"at.eggerapps.Table-Tool" code:2 userInfo:@{NSLocalizedDescriptionKey: @"Could not read data", NSLocalizedRecoverySuggestionErrorKey:errorCode2}];
}
return NO;
}
-(BOOL)scanUnquotedValueIntoString:(NSString **)scannedString error:(NSError **)outError{
NSMutableString *temporaryString = [[NSMutableString alloc]initWithString:@""];
while(!dataScanner.isAtEnd && ![quoteEndedCharacterSet characterIsMember:[dataString characterAtIndex:dataScanner.scanLocation]]){
if([dataString characterAtIndex:dataScanner.scanLocation] == '\"' && !unquoted){
if(outError != NULL) {
*outError = [NSError errorWithDomain:@"at.eggerapps.Table-Tool" code:3 userInfo:@{NSLocalizedDescriptionKey: @"Could not read data", NSLocalizedRecoverySuggestionErrorKey:errorCode3}];
}
return NO;
}
[temporaryString appendString:[dataString substringWithRange:NSMakeRange(dataScanner.scanLocation, 1)]];
dataScanner.scanLocation++;
}
*scannedString = temporaryString;
[self checkForCRLF];
return YES;
}
-(void)reset{
dataScanner = nil;
}
-(void)checkForCRLF{
if(dataScanner.scanLocation + 2 > dataString.length) return;
if([dataString characterAtIndex:dataScanner.scanLocation] == '\r' && [dataString characterAtIndex:dataScanner.scanLocation+1] == '\n'){
dataScanner.scanLocation++;
}
}
@end