// Copyright 2008 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef V8_DATEPARSER_H_
#define V8_DATEPARSER_H_
#include "scanner.h"
namespace v8 {
namespace internal {
class DateParser : public AllStatic {
public:
// Parse the string as a date. If parsing succeeds, return true after
// filling out the output array as follows (all integers are Smis):
// [0]: year
// [1]: month (0 = Jan, 1 = Feb, ...)
// [2]: day
// [3]: hour
// [4]: minute
// [5]: second
// [6]: UTC offset in seconds, or null value if no timezone specified
// If parsing fails, return false (content of output array is not defined).
template <typename Char>
static bool Parse(Vector<Char> str, FixedArray* output);
enum {
YEAR, MONTH, DAY, HOUR, MINUTE, SECOND, UTC_OFFSET, OUTPUT_SIZE
};
private:
// Range testing
static inline bool Between(int x, int lo, int hi) {
return static_cast<unsigned>(x - lo) <= static_cast<unsigned>(hi - lo);
}
// Indicates a missing value.
static const int kNone = kMaxInt;
// InputReader provides basic string parsing and character classification.
template <typename Char>
class InputReader BASE_EMBEDDED {
public:
explicit InputReader(Vector<Char> s)
: index_(0),
buffer_(s),
has_read_number_(false) {
Next();
}
// Advance to the next character of the string.
void Next() { ch_ = (index_ < buffer_.length()) ? buffer_[index_++] : 0; }
// Read a string of digits as an unsigned number (cap just below kMaxInt).
int ReadUnsignedNumber() {
has_read_number_ = true;
int n;
for (n = 0; IsAsciiDigit() && n < kMaxInt / 10 - 1; Next()) {
n = n * 10 + ch_ - '0';
}
return n;
}
// Read a word (sequence of chars. >= 'A'), fill the given buffer with a
// lower-case prefix, and pad any remainder of the buffer with zeroes.
// Return word length.
int ReadWord(uint32_t* prefix, int prefix_size) {
int len;
for (len = 0; IsAsciiAlphaOrAbove(); Next(), len++) {
if (len < prefix_size) prefix[len] = GetAsciiAlphaLower();
}
for (int i = len; i < prefix_size; i++) prefix[i] = 0;
return len;
}
// The skip methods return whether they actually skipped something.
bool Skip(uint32_t c) { return ch_ == c ? (Next(), true) : false; }
bool SkipWhiteSpace() {
return Scanner::kIsWhiteSpace.get(ch_) ? (Next(), true) : false;
}
bool SkipParentheses() {
if (ch_ != '(') return false;
int balance = 0;
do {
if (ch_ == ')') --balance;
else if (ch_ == '(') ++balance;
Next();
} while (balance > 0 && ch_);
return true;
}
// Character testing/classification. Non-ASCII digits are not supported.
bool Is(uint32_t c) const { return ch_ == c; }
bool IsEnd() const { return ch_ == 0; }
bool IsAsciiDigit() const { return IsDecimalDigit(ch_); }
bool IsAsciiAlphaOrAbove() const { return ch_ >= 'A'; }
bool IsAsciiSign() const { return ch_ == '+' || ch_ == '-'; }
// Return 1 for '+' and -1 for '-'.
int GetAsciiSignValue() const { return 44 - static_cast<int>(ch_); }
// Indicates whether any (possibly empty!) numbers have been read.
bool HasReadNumber() const { return has_read_number_; }
private:
// If current character is in 'A'-'Z' or 'a'-'z', return its lower-case.
// Else, return something outside of 'A'-'Z' and 'a'-'z'.
uint32_t GetAsciiAlphaLower() const { return ch_ | 32; }
int index_;
Vector<Char> buffer_;
bool has_read_number_;
uint32_t ch_;
};
enum KeywordType { INVALID, MONTH_NAME, TIME_ZONE_NAME, AM_PM };
// KeywordTable maps names of months, time zones, am/pm to numbers.
class KeywordTable : public AllStatic {
public:
// Look up a word in the keyword table and return an index.
// 'pre' contains a prefix of the word, zero-padded to size kPrefixLength
// and 'len' is the word length.
static int Lookup(const uint32_t* pre, int len);
// Get the type of the keyword at index i.
static KeywordType GetType(int i) {
return static_cast<KeywordType>(array[i][kTypeOffset]);
}
// Get the value of the keyword at index i.
static int GetValue(int i) { return array[i][kValueOffset]; }
static const int kPrefixLength = 3;
static const int kTypeOffset = kPrefixLength;
static const int kValueOffset = kTypeOffset + 1;
static const int kEntrySize = kValueOffset + 1;
static const int8_t array[][kEntrySize];
};
class TimeZoneComposer BASE_EMBEDDED {
public:
TimeZoneComposer() : sign_(kNone), hour_(kNone), minute_(kNone) {}
void Set(int offset_in_hours) {
sign_ = offset_in_hours < 0 ? -1 : 1;
hour_ = offset_in_hours * sign_;
minute_ = 0;
}
void SetSign(int sign) { sign_ = sign < 0 ? -1 : 1; }
void SetAbsoluteHour(int hour) { hour_ = hour; }
void SetAbsoluteMinute(int minute) { minute_ = minute; }
bool IsExpecting(int n) const {
return hour_ != kNone && minute_ == kNone && TimeComposer::IsMinute(n);
}
bool IsUTC() const { return hour_ == 0 && minute_ == 0; }
bool Write(FixedArray* output);
private:
int sign_;
int hour_;
int minute_;
};
class TimeComposer BASE_EMBEDDED {
public:
TimeComposer() : index_(0), hour_offset_(kNone) {}
bool IsEmpty() const { return index_ == 0; }
bool IsExpecting(int n) const {
return (index_ == 1 && IsMinute(n)) || (index_ == 2 && IsSecond(n));
}
bool Add(int n) {
return index_ < kSize ? (comp_[index_++] = n, true) : false;
}
bool AddFinal(int n) {
if (!Add(n)) return false;
while (index_ < kSize) comp_[index_++] = 0;
return true;
}
void SetHourOffset(int n) { hour_offset_ = n; }
bool Write(FixedArray* output);
static bool IsMinute(int x) { return Between(x, 0, 59); }
private:
static bool IsHour(int x) { return Between(x, 0, 23); }
static bool IsHour12(int x) { return Between(x, 0, 12); }
static bool IsSecond(int x) { return Between(x, 0, 59); }
static const int kSize = 3;
int comp_[kSize];
int index_;
int hour_offset_;
};
class DayComposer BASE_EMBEDDED {
public:
DayComposer() : index_(0), named_month_(kNone) {}
bool IsEmpty() const { return index_ == 0; }
bool Add(int n) {
return index_ < kSize ? (comp_[index_++] = n, true) : false;
}
void SetNamedMonth(int n) { named_month_ = n; }
bool Write(FixedArray* output);
private:
static bool IsMonth(int x) { return Between(x, 1, 12); }
static bool IsDay(int x) { return Between(x, 1, 31); }
static const int kSize = 3;
int comp_[kSize];
int index_;
int named_month_;
};
};
} } // namespace v8::internal
#endif // V8_DATEPARSER_H_