github.com/vanus-labs/vanus/lib@v0.0.0-20231221070800-1334a7b9605e/json/parse/string.go (about)

     1  // Copyright 2023 Linkall Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package parse
    16  
    17  import (
    18  	// standard libraries.
    19  	"errors"
    20  	"io"
    21  )
    22  
    23  var errInvalidString = errors.New("invalid string")
    24  
    25  const hicc = 0x1F // highest control characters.
    26  
    27  func ConsumeDoubleQuotedString(r io.ByteReader, w io.ByteWriter) error {
    28  	for {
    29  		c, err := r.ReadByte()
    30  		if err != nil {
    31  			return errInvalidString
    32  		}
    33  
    34  		switch c {
    35  		case '"': // double quotes, end of string
    36  			return nil
    37  		case '\\': // backslash
    38  			if err = ConsumeEscapedWithDoubleQuote(r, w); err != nil {
    39  				return errInvalidString
    40  			}
    41  		default:
    42  			if c <= hicc { // control characters
    43  				return errInvalidString
    44  			}
    45  			if err = w.WriteByte(c); err != nil {
    46  				return errInvalidString
    47  			}
    48  		}
    49  	}
    50  }
    51  
    52  func ConsumeSingleQuotedString(r io.ByteReader, w io.ByteWriter) error {
    53  	for {
    54  		c, err := r.ReadByte()
    55  		if err != nil {
    56  			return errInvalidString
    57  		}
    58  
    59  		switch c {
    60  		case '\'': // single quote, end of string
    61  			return nil
    62  		case '\\': // backslash
    63  			if err = ConsumeEscapedWithSingleQuote(r, w); err != nil {
    64  				return errInvalidString
    65  			}
    66  		default:
    67  			if c <= hicc { // control characters
    68  				return errInvalidString
    69  			}
    70  			if err = w.WriteByte(c); err != nil {
    71  				return errInvalidString
    72  			}
    73  		}
    74  	}
    75  }