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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=8 sts=2 et sw=2 tw=80:
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
/* String utility functions used by the module loader. */
#ifndef shell_StringUtils_h
#define shell_StringUtils_h
#include "js/StableStringChars.h"
#include "js/String.h"
namespace js {
namespace shell {
inline char16_t CharAt(JSLinearString* str, size_t index) {
return str->latin1OrTwoByteChar(index);
}
inline JSLinearString* SubString(JSContext* cx, JSLinearString* str,
size_t start, size_t end) {
MOZ_ASSERT(start <= str->length());
MOZ_ASSERT(end >= start && end <= str->length());
return NewDependentString(cx, str, start, end - start);
}
inline JSLinearString* SubString(JSContext* cx, JSLinearString* str,
size_t start) {
return SubString(cx, str, start, str->length());
}
template <size_t NullTerminatedLength>
bool StringStartsWith(JSLinearString* str,
const char16_t (&chars)[NullTerminatedLength]) {
MOZ_ASSERT(NullTerminatedLength > 0);
const size_t length = NullTerminatedLength - 1;
MOZ_ASSERT(chars[length] == '\0');
if (str->length() < length) {
return false;
}
for (size_t i = 0; i < length; i++) {
if (CharAt(str, i) != chars[i]) {
return false;
}
}
return true;
}
template <size_t NullTerminatedLength>
bool StringEquals(JSLinearString* str,
const char16_t (&chars)[NullTerminatedLength]) {
MOZ_ASSERT(NullTerminatedLength > 0);
const size_t length = NullTerminatedLength - 1;
MOZ_ASSERT(chars[length] == '\0');
return str->length() == length && StringStartsWith(str, chars);
}
inline int32_t IndexOf(Handle<JSLinearString*> str, char16_t target,
size_t start = 0) {
int32_t length = str->length();
for (int32_t i = start; i < length; i++) {
if (CharAt(str, i) == target) {
return i;
}
}
return -1;
}
inline int32_t LastIndexOf(Handle<JSLinearString*> str, char16_t target) {
int32_t length = str->length();
for (int32_t i = length - 1; i >= 0; i--) {
if (CharAt(str, i) == target) {
return i;
}
}
return -1;
}
inline JSLinearString* ReplaceCharGlobally(JSContext* cx,
Handle<JSLinearString*> str,
char16_t target,
char16_t replacement) {
int32_t i = IndexOf(str, target);
if (i == -1) {
return str;
}
JS::AutoStableStringChars chars(cx);
if (!chars.initTwoByte(cx, str)) {
return nullptr;
}
Vector<char16_t> buf(cx);
if (!buf.append(chars.twoByteChars(), str->length())) {
return nullptr;
}
for (; i < int32_t(buf.length()); i++) {
if (buf[i] == target) {
buf[i] = replacement;
}
}
RootedString result(cx, JS_NewUCStringCopyN(cx, buf.begin(), buf.length()));
if (!result) {
return nullptr;
}
return JS_EnsureLinearString(cx, result);
}
inline JSString* JoinStrings(JSContext* cx,
Handle<GCVector<JSLinearString*>> strings,
Handle<JSLinearString*> separator) {
RootedString result(cx, JS_GetEmptyString(cx));
for (size_t i = 0; i < strings.length(); i++) {
HandleString str = strings[i];
if (i != 0) {
result = JS_ConcatStrings(cx, result, separator);
if (!result) {
return nullptr;
}
}
result = JS_ConcatStrings(cx, result, str);
if (!result) {
return nullptr;
}
}
return result;
}
} // namespace shell
} // namespace js
#endif // shell_StringUtils_h