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      1 // Copyright 2011 the V8 project authors. All rights reserved.
      2 // Redistribution and use in source and binary forms, with or without
      3 // modification, are permitted provided that the following conditions are
      4 // met:
      5 //
      6 //     * Redistributions of source code must retain the above copyright
      7 //       notice, this list of conditions and the following disclaimer.
      8 //     * Redistributions in binary form must reproduce the above
      9 //       copyright notice, this list of conditions and the following
     10 //       disclaimer in the documentation and/or other materials provided
     11 //       with the distribution.
     12 //     * Neither the name of Google Inc. nor the names of its
     13 //       contributors may be used to endorse or promote products derived
     14 //       from this software without specific prior written permission.
     15 //
     16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27 
     28 #ifndef V8_CHAR_PREDICATES_INL_H_
     29 #define V8_CHAR_PREDICATES_INL_H_
     30 
     31 #include "char-predicates.h"
     32 
     33 namespace v8 {
     34 namespace internal {
     35 
     36 
     37 // If c is in 'A'-'Z' or 'a'-'z', return its lower-case.
     38 // Else, return something outside of 'A'-'Z' and 'a'-'z'.
     39 // Note: it ignores LOCALE.
     40 inline int AsciiAlphaToLower(uc32 c) {
     41   return c | 0x20;
     42 }
     43 
     44 
     45 inline bool IsCarriageReturn(uc32 c) {
     46   return c == 0x000D;
     47 }
     48 
     49 
     50 inline bool IsLineFeed(uc32 c) {
     51   return c == 0x000A;
     52 }
     53 
     54 
     55 inline bool IsInRange(int value, int lower_limit, int higher_limit) {
     56   ASSERT(lower_limit <= higher_limit);
     57   return static_cast<unsigned int>(value - lower_limit) <=
     58       static_cast<unsigned int>(higher_limit - lower_limit);
     59 }
     60 
     61 
     62 inline bool IsDecimalDigit(uc32 c) {
     63   // ECMA-262, 3rd, 7.8.3 (p 16)
     64   return IsInRange(c, '0', '9');
     65 }
     66 
     67 
     68 inline bool IsHexDigit(uc32 c) {
     69   // ECMA-262, 3rd, 7.6 (p 15)
     70   return IsDecimalDigit(c) || IsInRange(AsciiAlphaToLower(c), 'a', 'f');
     71 }
     72 
     73 
     74 inline bool IsRegExpWord(uc16 c) {
     75   return IsInRange(AsciiAlphaToLower(c), 'a', 'z')
     76       || IsDecimalDigit(c)
     77       || (c == '_');
     78 }
     79 
     80 
     81 inline bool IsRegExpNewline(uc16 c) {
     82   switch (c) {
     83     //   CR           LF           LS           PS
     84     case 0x000A: case 0x000D: case 0x2028: case 0x2029:
     85       return false;
     86     default:
     87       return true;
     88   }
     89 }
     90 
     91 
     92 } }  // namespace v8::internal
     93 
     94 #endif  // V8_CHAR_PREDICATES_INL_H_
     95