540 lines
18 KiB
C
540 lines
18 KiB
C
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//===--- StringRef.h - Constant String Reference Wrapper --------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ADT_STRINGREF_H
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#define LLVM_ADT_STRINGREF_H
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#include <algorithm>
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#include <cassert>
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#include <cstring>
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#include <limits>
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#include <ostream>
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#include <string>
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#include <utility>
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namespace llvm {
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template <typename T>
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class SmallVectorImpl;
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class StringRef;
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/// Helper functions for StringRef::getAsInteger.
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bool getAsUnsignedInteger(StringRef Str, unsigned Radix,
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unsigned long long &Result);
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bool getAsSignedInteger(StringRef Str, unsigned Radix, long long &Result);
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/// StringRef - Represent a constant reference to a string, i.e. a character
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/// array and a length, which need not be null terminated.
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///
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/// This class does not own the string data, it is expected to be used in
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/// situations where the character data resides in some other buffer, whose
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/// lifetime extends past that of the StringRef. For this reason, it is not in
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/// general safe to store a StringRef.
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class StringRef {
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public:
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typedef const char *iterator;
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typedef const char *const_iterator;
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static const size_t npos = ~size_t(0);
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typedef size_t size_type;
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private:
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/// The start of the string, in an external buffer.
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const char *Data;
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/// The length of the string.
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size_t Length;
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// Workaround memcmp issue with null pointers (undefined behavior)
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// by providing a specialized version
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static int compareMemory(const char *Lhs, const char *Rhs, size_t Length) {
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if (Length == 0) { return 0; }
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return ::memcmp(Lhs,Rhs,Length);
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}
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public:
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/// @name Constructors
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/// @{
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/// Construct an empty string ref.
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/*implicit*/ StringRef() : Data(nullptr), Length(0) {}
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/// Construct a string ref from a cstring.
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/*implicit*/ StringRef(const char *Str)
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: Data(Str) {
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assert(Str && "StringRef cannot be built from a NULL argument");
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Length = ::strlen(Str); // invoking strlen(NULL) is undefined behavior
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}
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/// Construct a string ref from a pointer and length.
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/*implicit*/ StringRef(const char *data, size_t length)
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: Data(data), Length(length) {
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assert((data || length == 0) &&
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"StringRef cannot be built from a NULL argument with non-null length");
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}
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/// Construct a string ref from an std::string.
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/*implicit*/ StringRef(const std::string &Str)
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: Data(Str.data()), Length(Str.length()) {}
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/// @}
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/// @name Iterators
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/// @{
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iterator begin() const { return Data; }
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iterator end() const { return Data + Length; }
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const unsigned char *bytes_begin() const {
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return reinterpret_cast<const unsigned char *>(begin());
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}
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const unsigned char *bytes_end() const {
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return reinterpret_cast<const unsigned char *>(end());
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}
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/// @}
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/// @name String Operations
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/// @{
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/// data - Get a pointer to the start of the string (which may not be null
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/// terminated).
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const char *data() const { return Data; }
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/// empty - Check if the string is empty.
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bool empty() const { return Length == 0; }
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/// size - Get the string size.
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size_t size() const { return Length; }
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/// front - Get the first character in the string.
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char front() const {
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assert(!empty());
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return Data[0];
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}
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/// back - Get the last character in the string.
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char back() const {
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assert(!empty());
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return Data[Length-1];
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}
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// copy - Allocate copy in Allocator and return StringRef to it.
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template <typename Allocator> StringRef copy(Allocator &A) const {
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char *S = A.template Allocate<char>(Length);
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std::copy(begin(), end(), S);
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return StringRef(S, Length);
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}
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/// equals - Check for string equality, this is more efficient than
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/// compare() when the relative ordering of inequal strings isn't needed.
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bool equals(StringRef RHS) const {
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return (Length == RHS.Length &&
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compareMemory(Data, RHS.Data, RHS.Length) == 0);
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}
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/// equals_lower - Check for string equality, ignoring case.
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bool equals_lower(StringRef RHS) const {
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return Length == RHS.Length && compare_lower(RHS) == 0;
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}
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/// compare - Compare two strings; the result is -1, 0, or 1 if this string
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/// is lexicographically less than, equal to, or greater than the \p RHS.
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int compare(StringRef RHS) const {
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// Check the prefix for a mismatch.
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if (int Res = compareMemory(Data, RHS.Data, std::min(Length, RHS.Length)))
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return Res < 0 ? -1 : 1;
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// Otherwise the prefixes match, so we only need to check the lengths.
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if (Length == RHS.Length)
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return 0;
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return Length < RHS.Length ? -1 : 1;
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}
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/// compare_lower - Compare two strings, ignoring case.
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int compare_lower(StringRef RHS) const;
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/// compare_numeric - Compare two strings, treating sequences of digits as
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/// numbers.
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int compare_numeric(StringRef RHS) const;
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/// str - Get the contents as an std::string.
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std::string str() const {
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if (!Data) return std::string();
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return std::string(Data, Length);
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}
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/// @}
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/// @name Operator Overloads
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/// @{
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char operator[](size_t Index) const {
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assert(Index < Length && "Invalid index!");
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return Data[Index];
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}
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/// @}
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/// @name Type Conversions
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/// @{
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operator std::string() const {
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return str();
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}
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/// @}
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/// @name String Predicates
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/// @{
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/// Check if this string starts with the given \p Prefix.
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bool startswith(StringRef Prefix) const {
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return Length >= Prefix.Length &&
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compareMemory(Data, Prefix.Data, Prefix.Length) == 0;
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}
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/// Check if this string starts with the given \p Prefix, ignoring case.
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bool startswith_lower(StringRef Prefix) const;
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/// Check if this string ends with the given \p Suffix.
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bool endswith(StringRef Suffix) const {
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return Length >= Suffix.Length &&
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compareMemory(end() - Suffix.Length, Suffix.Data, Suffix.Length) == 0;
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}
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/// Check if this string ends with the given \p Suffix, ignoring case.
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bool endswith_lower(StringRef Suffix) const;
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/// @}
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/// @name String Searching
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/// @{
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/// Search for the first character \p C in the string.
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///
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/// \returns The index of the first occurrence of \p C, or npos if not
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/// found.
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size_t find(char C, size_t From = 0) const {
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size_t FindBegin = std::min(From, Length);
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if (FindBegin < Length) { // Avoid calling memchr with nullptr.
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// Just forward to memchr, which is faster than a hand-rolled loop.
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if (const void *P = ::memchr(Data + FindBegin, C, Length - FindBegin))
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return static_cast<const char *>(P) - Data;
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}
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return npos;
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}
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/// Search for the first string \p Str in the string.
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///
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/// \returns The index of the first occurrence of \p Str, or npos if not
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/// found.
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size_t find(StringRef Str, size_t From = 0) const;
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/// Search for the last character \p C in the string.
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///
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/// \returns The index of the last occurrence of \p C, or npos if not
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/// found.
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size_t rfind(char C, size_t From = npos) const {
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From = std::min(From, Length);
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size_t i = From;
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while (i != 0) {
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--i;
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if (Data[i] == C)
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return i;
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}
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return npos;
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}
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/// Search for the last string \p Str in the string.
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///
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/// \returns The index of the last occurrence of \p Str, or npos if not
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/// found.
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size_t rfind(StringRef Str) const;
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/// Find the first character in the string that is \p C, or npos if not
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/// found. Same as find.
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size_t find_first_of(char C, size_t From = 0) const {
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return find(C, From);
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}
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/// Find the first character in the string that is in \p Chars, or npos if
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/// not found.
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///
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/// Complexity: O(size() + Chars.size())
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size_t find_first_of(StringRef Chars, size_t From = 0) const;
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/// Find the first character in the string that is not \p C or npos if not
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/// found.
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size_t find_first_not_of(char C, size_t From = 0) const;
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/// Find the first character in the string that is not in the string
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/// \p Chars, or npos if not found.
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///
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/// Complexity: O(size() + Chars.size())
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size_t find_first_not_of(StringRef Chars, size_t From = 0) const;
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/// Find the last character in the string that is \p C, or npos if not
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/// found.
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size_t find_last_of(char C, size_t From = npos) const {
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return rfind(C, From);
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}
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/// Find the last character in the string that is in \p C, or npos if not
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/// found.
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///
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/// Complexity: O(size() + Chars.size())
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size_t find_last_of(StringRef Chars, size_t From = npos) const;
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/// Find the last character in the string that is not \p C, or npos if not
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/// found.
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size_t find_last_not_of(char C, size_t From = npos) const;
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/// Find the last character in the string that is not in \p Chars, or
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/// npos if not found.
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///
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/// Complexity: O(size() + Chars.size())
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size_t find_last_not_of(StringRef Chars, size_t From = npos) const;
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/// @}
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/// @name Helpful Algorithms
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/// @{
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/// Return the number of occurrences of \p C in the string.
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size_t count(char C) const {
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size_t Count = 0;
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for (size_t i = 0, e = Length; i != e; ++i)
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if (Data[i] == C)
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++Count;
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return Count;
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}
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/// Return the number of non-overlapped occurrences of \p Str in
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/// the string.
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size_t count(StringRef Str) const;
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/// Parse the current string as an integer of the specified radix. If
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/// \p Radix is specified as zero, this does radix autosensing using
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/// extended C rules: 0 is octal, 0x is hex, 0b is binary.
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///
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/// If the string is invalid or if only a subset of the string is valid,
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/// this returns true to signify the error. The string is considered
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/// erroneous if empty or if it overflows T.
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template <typename T>
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typename std::enable_if<std::numeric_limits<T>::is_signed, bool>::type
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getAsInteger(unsigned Radix, T &Result) const {
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long long LLVal;
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if (getAsSignedInteger(*this, Radix, LLVal) ||
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static_cast<T>(LLVal) != LLVal)
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return true;
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Result = LLVal;
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return false;
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}
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template <typename T>
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typename std::enable_if<!std::numeric_limits<T>::is_signed, bool>::type
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getAsInteger(unsigned Radix, T &Result) const {
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unsigned long long ULLVal;
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// The additional cast to unsigned long long is required to avoid the
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// Visual C++ warning C4805: '!=' : unsafe mix of type 'bool' and type
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// 'unsigned __int64' when instantiating getAsInteger with T = bool.
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if (getAsUnsignedInteger(*this, Radix, ULLVal) ||
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static_cast<unsigned long long>(static_cast<T>(ULLVal)) != ULLVal)
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return true;
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Result = ULLVal;
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return false;
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}
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/// @}
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/// @name String Operations
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/// @{
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// Convert the given ASCII string to lowercase.
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std::string lower() const;
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/// Convert the given ASCII string to uppercase.
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std::string upper() const;
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/// @}
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/// @name Substring Operations
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/// @{
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/// Return a reference to the substring from [Start, Start + N).
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///
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/// \param Start The index of the starting character in the substring; if
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/// the index is npos or greater than the length of the string then the
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/// empty substring will be returned.
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///
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/// \param N The number of characters to included in the substring. If N
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/// exceeds the number of characters remaining in the string, the string
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/// suffix (starting with \p Start) will be returned.
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StringRef substr(size_t Start, size_t N = npos) const {
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Start = std::min(Start, Length);
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return StringRef(Data + Start, std::min(N, Length - Start));
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}
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/// Return a StringRef equal to 'this' but with the first \p N elements
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/// dropped.
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StringRef drop_front(size_t N = 1) const {
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assert(size() >= N && "Dropping more elements than exist");
|
||
|
|
return substr(N);
|
||
|
|
}
|
||
|
|
|
||
|
|
/// Return a StringRef equal to 'this' but with the last \p N elements
|
||
|
|
/// dropped.
|
||
|
|
StringRef drop_back(size_t N = 1) const {
|
||
|
|
assert(size() >= N && "Dropping more elements than exist");
|
||
|
|
return substr(0, size()-N);
|
||
|
|
}
|
||
|
|
|
||
|
|
/// Return a reference to the substring from [Start, End).
|
||
|
|
///
|
||
|
|
/// \param Start The index of the starting character in the substring; if
|
||
|
|
/// the index is npos or greater than the length of the string then the
|
||
|
|
/// empty substring will be returned.
|
||
|
|
///
|
||
|
|
/// \param End The index following the last character to include in the
|
||
|
|
/// substring. If this is npos, or less than \p Start, or exceeds the
|
||
|
|
/// number of characters remaining in the string, the string suffix
|
||
|
|
/// (starting with \p Start) will be returned.
|
||
|
|
StringRef slice(size_t Start, size_t End) const {
|
||
|
|
Start = std::min(Start, Length);
|
||
|
|
End = std::min(std::max(Start, End), Length);
|
||
|
|
return StringRef(Data + Start, End - Start);
|
||
|
|
}
|
||
|
|
|
||
|
|
/// Split into two substrings around the first occurrence of a separator
|
||
|
|
/// character.
|
||
|
|
///
|
||
|
|
/// If \p Separator is in the string, then the result is a pair (LHS, RHS)
|
||
|
|
/// such that (*this == LHS + Separator + RHS) is true and RHS is
|
||
|
|
/// maximal. If \p Separator is not in the string, then the result is a
|
||
|
|
/// pair (LHS, RHS) where (*this == LHS) and (RHS == "").
|
||
|
|
///
|
||
|
|
/// \param Separator The character to split on.
|
||
|
|
/// \returns The split substrings.
|
||
|
|
std::pair<StringRef, StringRef> split(char Separator) const {
|
||
|
|
size_t Idx = find(Separator);
|
||
|
|
if (Idx == npos)
|
||
|
|
return std::make_pair(*this, StringRef());
|
||
|
|
return std::make_pair(slice(0, Idx), slice(Idx+1, npos));
|
||
|
|
}
|
||
|
|
|
||
|
|
/// Split into two substrings around the first occurrence of a separator
|
||
|
|
/// string.
|
||
|
|
///
|
||
|
|
/// If \p Separator is in the string, then the result is a pair (LHS, RHS)
|
||
|
|
/// such that (*this == LHS + Separator + RHS) is true and RHS is
|
||
|
|
/// maximal. If \p Separator is not in the string, then the result is a
|
||
|
|
/// pair (LHS, RHS) where (*this == LHS) and (RHS == "").
|
||
|
|
///
|
||
|
|
/// \param Separator - The string to split on.
|
||
|
|
/// \return - The split substrings.
|
||
|
|
std::pair<StringRef, StringRef> split(StringRef Separator) const {
|
||
|
|
size_t Idx = find(Separator);
|
||
|
|
if (Idx == npos)
|
||
|
|
return std::make_pair(*this, StringRef());
|
||
|
|
return std::make_pair(slice(0, Idx), slice(Idx + Separator.size(), npos));
|
||
|
|
}
|
||
|
|
|
||
|
|
/// Split into substrings around the occurrences of a separator string.
|
||
|
|
///
|
||
|
|
/// Each substring is stored in \p A. If \p MaxSplit is >= 0, at most
|
||
|
|
/// \p MaxSplit splits are done and consequently <= \p MaxSplit
|
||
|
|
/// elements are added to A.
|
||
|
|
/// If \p KeepEmpty is false, empty strings are not added to \p A. They
|
||
|
|
/// still count when considering \p MaxSplit
|
||
|
|
/// An useful invariant is that
|
||
|
|
/// Separator.join(A) == *this if MaxSplit == -1 and KeepEmpty == true
|
||
|
|
///
|
||
|
|
/// \param A - Where to put the substrings.
|
||
|
|
/// \param Separator - The string to split on.
|
||
|
|
/// \param MaxSplit - The maximum number of times the string is split.
|
||
|
|
/// \param KeepEmpty - True if empty substring should be added.
|
||
|
|
void split(SmallVectorImpl<StringRef> &A,
|
||
|
|
StringRef Separator, int MaxSplit = -1,
|
||
|
|
bool KeepEmpty = true) const;
|
||
|
|
|
||
|
|
/// Split into two substrings around the last occurrence of a separator
|
||
|
|
/// character.
|
||
|
|
///
|
||
|
|
/// If \p Separator is in the string, then the result is a pair (LHS, RHS)
|
||
|
|
/// such that (*this == LHS + Separator + RHS) is true and RHS is
|
||
|
|
/// minimal. If \p Separator is not in the string, then the result is a
|
||
|
|
/// pair (LHS, RHS) where (*this == LHS) and (RHS == "").
|
||
|
|
///
|
||
|
|
/// \param Separator - The character to split on.
|
||
|
|
/// \return - The split substrings.
|
||
|
|
std::pair<StringRef, StringRef> rsplit(char Separator) const {
|
||
|
|
size_t Idx = rfind(Separator);
|
||
|
|
if (Idx == npos)
|
||
|
|
return std::make_pair(*this, StringRef());
|
||
|
|
return std::make_pair(slice(0, Idx), slice(Idx+1, npos));
|
||
|
|
}
|
||
|
|
|
||
|
|
/// Return string with consecutive characters in \p Chars starting from
|
||
|
|
/// the left removed.
|
||
|
|
StringRef ltrim(StringRef Chars = " \t\n\v\f\r") const {
|
||
|
|
return drop_front(std::min(Length, find_first_not_of(Chars)));
|
||
|
|
}
|
||
|
|
|
||
|
|
/// Return string with consecutive characters in \p Chars starting from
|
||
|
|
/// the right removed.
|
||
|
|
StringRef rtrim(StringRef Chars = " \t\n\v\f\r") const {
|
||
|
|
return drop_back(Length - std::min(Length, find_last_not_of(Chars) + 1));
|
||
|
|
}
|
||
|
|
|
||
|
|
/// Return string with consecutive characters in \p Chars starting from
|
||
|
|
/// the left and right removed.
|
||
|
|
StringRef trim(StringRef Chars = " \t\n\v\f\r") const {
|
||
|
|
return ltrim(Chars).rtrim(Chars);
|
||
|
|
}
|
||
|
|
|
||
|
|
/// @}
|
||
|
|
};
|
||
|
|
|
||
|
|
/// @name StringRef Comparison Operators
|
||
|
|
/// @{
|
||
|
|
|
||
|
|
inline bool operator==(StringRef LHS, StringRef RHS) {
|
||
|
|
return LHS.equals(RHS);
|
||
|
|
}
|
||
|
|
|
||
|
|
inline bool operator!=(StringRef LHS, StringRef RHS) {
|
||
|
|
return !(LHS == RHS);
|
||
|
|
}
|
||
|
|
|
||
|
|
inline bool operator<(StringRef LHS, StringRef RHS) {
|
||
|
|
return LHS.compare(RHS) == -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
inline bool operator<=(StringRef LHS, StringRef RHS) {
|
||
|
|
return LHS.compare(RHS) != 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
inline bool operator>(StringRef LHS, StringRef RHS) {
|
||
|
|
return LHS.compare(RHS) == 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
inline bool operator>=(StringRef LHS, StringRef RHS) {
|
||
|
|
return LHS.compare(RHS) != -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
inline std::string &operator+=(std::string &buffer, StringRef string) {
|
||
|
|
return buffer.append(string.data(), string.size());
|
||
|
|
}
|
||
|
|
|
||
|
|
inline std::ostream &operator<<(std::ostream &os, StringRef string) {
|
||
|
|
os.write(string.data(), string.size());
|
||
|
|
return os;
|
||
|
|
}
|
||
|
|
|
||
|
|
/// @}
|
||
|
|
|
||
|
|
// StringRefs can be treated like a POD type.
|
||
|
|
template <typename T> struct isPodLike;
|
||
|
|
template <> struct isPodLike<StringRef> { static const bool value = true; };
|
||
|
|
} // namespace llvm
|
||
|
|
|
||
|
|
#endif
|