// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#import "ios/chrome/common/string_util.h"
#import <UIKit/UIKit.h>
#import "base/check.h"
#import "base/strings/sys_string_conversions.h"
namespace {
typedef BOOL (^ArrayFilterProcedure)(id object, NSUInteger index, BOOL* stop);
typedef NSString* (^SubstringExtractionProcedure)(NSUInteger);
NSString* const kBeginLinkTag = @"BEGIN_LINK[ \t]*";
NSString* const kEndLinkTag = @"[ \t]*END_LINK";
NSString* const kBeginBoldTag = @"BEGIN_BOLD[ \t]*";
NSString* const kEndBoldTag = @"[ \t]*END_BOLD";
}
StringWithTags::StringWithTags() = default;
StringWithTags::StringWithTags(NSString* string, std::vector<NSRange> ranges)
: string([string copy]), ranges(ranges) {}
StringWithTags::StringWithTags(const StringWithTags& other) = default;
StringWithTags& StringWithTags::operator=(const StringWithTags& other) =
default;
StringWithTags::StringWithTags(StringWithTags&& other) = default;
StringWithTags& StringWithTags::operator=(StringWithTags&& other) = default;
StringWithTags::~StringWithTags() = default;
StringWithTags ParseStringWithLinks(NSString* text) {
return ParseStringWithTags(text, kBeginLinkTag, kEndLinkTag);
}
NSAttributedString* AttributedStringFromStringWithLink(
NSString* text,
NSDictionary* text_attributes,
NSDictionary* link_attributes) {
StringWithTag parsed_string =
ParseStringWithTag(text, kBeginLinkTag, kEndLinkTag);
NSMutableAttributedString* attributed_string =
[[NSMutableAttributedString alloc] initWithString:parsed_string.string
attributes:text_attributes];
DCHECK(parsed_string.range.location != NSNotFound);
if (link_attributes != nil) {
[attributed_string addAttributes:link_attributes range:parsed_string.range];
}
return attributed_string;
}
StringWithTag ParseStringWithTag(NSString* text,
NSString* begin_tag,
NSString* end_tag) {
const StringWithTags parsed_string =
ParseStringWithTags(text, begin_tag, end_tag);
DCHECK_LE(parsed_string.ranges.size(), 1u);
return StringWithTag{parsed_string.string, parsed_string.ranges.empty()
? NSRange{NSNotFound, 0}
: parsed_string.ranges[0]};
}
StringWithTags ParseStringWithTags(NSString* text,
NSString* begin_tag,
NSString* end_tag) {
NSMutableString* out_text = nil;
std::vector<NSRange> tag_ranges;
NSRange text_range{0, text.length};
do {
// Find the next `begin_tag` in `text_range`.
const NSRange begin_range = [text rangeOfString:begin_tag
options:NSRegularExpressionSearch
range:text_range];
// If no `begin_tag` is found, then there is no substitutions remainining.
if (begin_range.length == 0)
break;
// Find the next `end_tag` after the recently found `begin_tag`.
const NSUInteger after_begin_pos = NSMaxRange(begin_range);
const NSRange after_begin_range{
after_begin_pos,
text_range.length - (after_begin_pos - text_range.location)};
const NSRange end_range = [text rangeOfString:end_tag
options:NSRegularExpressionSearch
range:after_begin_range];
// If no `end_tag` is found, then there is no substitutions remaining.
if (end_range.length == 0)
break;
if (!out_text)
out_text = [[NSMutableString alloc] initWithCapacity:text.length];
const NSUInteger after_end_pos = NSMaxRange(end_range);
[out_text
appendString:[text
substringWithRange:NSRange{text_range.location,
begin_range.location -
text_range.location}]];
[out_text
appendString:[text substringWithRange:NSRange{after_begin_pos,
end_range.location -
after_begin_pos}]];
const NSUInteger tag_length = end_range.location - after_begin_pos;
tag_ranges.push_back(NSRange{out_text.length - tag_length, tag_length});
text_range =
NSRange{after_end_pos,
text_range.length - (after_end_pos - text_range.location)};
} while (text_range.length != 0);
if (!out_text) {
DCHECK(tag_ranges.empty());
return StringWithTags(text, {});
}
// Append any remaining text without tags.
if (text_range.length != 0)
[out_text appendString:[text substringWithRange:text_range]];
return StringWithTags(out_text, tag_ranges);
}
CGRect TextViewLinkBound(UITextView* text_view, NSRange character_range) {
// Calculate UITextRange with NSRange.
UITextPosition* beginning = text_view.beginningOfDocument;
UITextPosition* start =
[text_view positionFromPosition:beginning
offset:character_range.location];
UITextPosition* end = [text_view positionFromPosition:start
offset:character_range.length];
CGRect rect = CGRectNull;
// Returns CGRectNull if there is a nil text position.
if (start && end) {
UITextRange* text_range = [text_view textRangeFromPosition:start
toPosition:end];
NSArray* selection_rects = [text_view selectionRectsForRange:text_range];
for (UITextSelectionRect* selection_rect in selection_rects) {
rect = CGRectUnion(rect, selection_rect.rect);
}
}
return rect;
}
NSAttributedString* PutBoldPartInString(NSString* string,
UIFontTextStyle font_style) {
UIFontDescriptor* default_descriptor =
[UIFontDescriptor preferredFontDescriptorWithTextStyle:font_style];
UIFontDescriptor* bold_descriptor =
[[UIFontDescriptor preferredFontDescriptorWithTextStyle:font_style]
fontDescriptorWithSymbolicTraits:UIFontDescriptorTraitBold];
StringWithTag parsed_string =
ParseStringWithTag(string, kBeginBoldTag, kEndBoldTag);
NSMutableAttributedString* attributed_string =
[[NSMutableAttributedString alloc] initWithString:parsed_string.string];
[attributed_string addAttribute:NSFontAttributeName
value:[UIFont fontWithDescriptor:default_descriptor
size:0.0]
range:NSMakeRange(0, parsed_string.string.length)];
[attributed_string addAttribute:NSFontAttributeName
value:[UIFont fontWithDescriptor:bold_descriptor
size:0.0]
range:parsed_string.range];
return attributed_string;
}
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