/*
* Copyright (c) Meta Platforms, Inc. and affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/

#import "RCTJSStackFrame.h"

#import "RCTLog.h"
#import "RCTUtils.h"

/**
* The RegEx used to parse Error.stack.
*
* JavaScriptCore has the following format:
*
* Exception: Error: argh
* func1@/path/to/file.js:2:18
* func2@/path/to/file.js:6:8
* eval@[native code]
* global code@/path/to/file.js:13:5
*
* Another supported format:
*
* Error: argh
* at func1 (/path/to/file.js:2:18)
* at func2 (/path/to/file.js:6:8)
* at eval (native)
* at global (/path/to/file.js:13:5)
*/
static NSRegularExpression *RCTJSStackFrameRegex()
{
static dispatch_once_t onceToken;
static NSRegularExpression *_regex;
dispatch_once(&onceToken, ^{
NSString *pattern =
@"\\s*(?:at)?\\s*" // Skip leading "at" and whitespace, noncapturing
@"(.+?)" // Capture the function name (group 1)
@"\\s*[@(]" // Skip whitespace, then @ or (
@"(.*):" // Capture the file name (group 2), then colon
@"(\\d+):(\\d+)" // Line and column number (groups 3 and 4)
@"\\)?$" // Optional closing paren and EOL
;
NSError *regexError;
_regex = [NSRegularExpression regularExpressionWithPattern:pattern options:0 error:&regexError];
if (regexError) {
RCTLogError(@"Failed to build regex: %@", [regexError localizedDescription]);
}
});
return _regex;
}

@implementation RCTJSStackFrame

- (instancetype)initWithMethodName:(NSString *)methodName
file:(NSString *)file
lineNumber:(NSInteger)lineNumber
column:(NSInteger)column
collapse:(BOOL)collapse
{
if (self = [super init]) {
_methodName = methodName;
_file = file;
_lineNumber = lineNumber;
_column = column;
_collapse = collapse;
}
return self;
}

- (NSDictionary *)toDictionary
{
return @{
@"methodName" : RCTNullIfNil(self.methodName),
@"file" : RCTNullIfNil(self.file),
@"lineNumber" : @(self.lineNumber),
@"column" : @(self.column),
@"collapse" : @(self.collapse)
};
}

+ (instancetype)stackFrameWithLine:(NSString *)line
{
NSTextCheckingResult *match = [RCTJSStackFrameRegex() firstMatchInString:line
options:0
range:NSMakeRange(0, line.length)];
if (!match) {
return nil;
}

// methodName may not be present for e.g. anonymous functions
const NSRange methodNameRange = [match rangeAtIndex:1];
NSString *methodName = methodNameRange.location == NSNotFound ? nil : [line substringWithRange:methodNameRange];
NSString *file = [line substringWithRange:[match rangeAtIndex:2]];
NSString *lineNumber = [line substringWithRange:[match rangeAtIndex:3]];
NSString *column = [line substringWithRange:[match rangeAtIndex:4]];

return [[self alloc] initWithMethodName:methodName
file:file
lineNumber:[lineNumber integerValue]
column:[column integerValue]
collapse:NO];
}

+ (instancetype)stackFrameWithDictionary:(NSDictionary *)dict
{
return [[self alloc] initWithMethodName:RCTNilIfNull(dict[@"methodName"])
file:dict[@"file"]
lineNumber:[RCTNilIfNull(dict[@"lineNumber"]) integerValue]
column:[RCTNilIfNull(dict[@"column"]) integerValue]
collapse:[RCTNilIfNull(dict[@"collapse"]) boolValue]];
}

+ (NSArray<RCTJSStackFrame *> *)stackFramesWithLines:(NSString *)lines
{
NSMutableArray *stack = [NSMutableArray new];
for (NSString *line in [lines componentsSeparatedByString:@"\n"]) {
RCTJSStackFrame *frame = [self stackFrameWithLine:line];
if (frame) {
[stack addObject:frame];
}
}
return stack;
}

+ (NSArray<RCTJSStackFrame *> *)stackFramesWithDictionaries:(NSArray<NSDictionary *> *)dicts
{
NSMutableArray *stack = [NSMutableArray new];
for (NSDictionary *dict in dicts) {
RCTJSStackFrame *frame = [self stackFrameWithDictionary:dict];
if (frame) {
[stack addObject:frame];
}
}
return stack;
}

- (NSString *)description
{
return [NSString stringWithFormat:@"<%@: %p method name: %@; file name: %@; line: %ld; column: %ld>",
self.class,
self,
self.methodName,
self.file,
(long)self.lineNumber,
(long)self.column];
}

@end