utils.go

Documentation: github.com/cloudwego/iasm/expr

     1  //
     2  // Copyright 2024 CloudWeGo Authors
     3  //
     4  // Licensed under the Apache License, Version 2.0 (the "License");
     5  // you may not use this file except in compliance with the License.
     6  // You may obtain a copy of the License at
     7  //
     8  //     http://www.apache.org/licenses/LICENSE-2.0
     9  //
    10  // Unless required by applicable law or agreed to in writing, software
    11  // distributed under the License is distributed on an "AS IS" BASIS,
    12  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  // See the License for the specific language governing permissions and
    14  // limitations under the License.
    15  //
    16  
    17  package expr
    18  
    19  var op1ch = [...]bool {
    20      '+': true,
    21      '-': true,
    22      '*': true,
    23      '/': true,
    24      '%': true,
    25      '&': true,
    26      '|': true,
    27      '^': true,
    28      '~': true,
    29      '(': true,
    30      ')': true,
    31  }
    32  
    33  var op2ch = [...]bool {
    34      '*': true,
    35      '<': true,
    36      '>': true,
    37  }
    38  
    39  func neg2(v *Expr, err error) (*Expr, error) {
    40      if err != nil {
    41          return nil, err
    42      } else {
    43          return v.Neg(), nil
    44      }
    45  }
    46  
    47  func not2(v *Expr, err error) (*Expr, error) {
    48      if err != nil {
    49          return nil, err
    50      } else {
    51          return v.Not(), nil
    52      }
    53  }
    54  
    55  func isop1ch(ch rune) bool {
    56      return ch >= 0 && int(ch) < len(op1ch) && op1ch[ch]
    57  }
    58  
    59  func isop2ch(ch rune) bool {
    60      return ch >= 0 && int(ch) < len(op2ch) && op2ch[ch]
    61  }
    62  
    63  func isdigit(ch rune) bool {
    64      return ch >= '0' && ch <= '9'
    65  }
    66  
    67  func isident(ch rune) bool {
    68      return isdigit(ch) || isident0(ch)
    69  }
    70  
    71  func isident0(ch rune) bool {
    72      return (ch == '_') || (ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z')
    73  }
    74  
    75  func ishexdigit(ch rune) bool {
    76      return isdigit(ch) || (ch >= 'a' && ch <= 'f') || (ch >= 'A' && ch <= 'F')
    77  }
    78
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