1 /* 2 * Copyright (c) 2024, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 #include "schema_cursor.h" 27 #include <iostream> 28 #include<cstring> 29 30 31 SchemaCursor::SchemaCursor(char *ptr): ptr(ptr) { 32 } 33 34 SchemaCursor::~SchemaCursor() = default; 35 36 void SchemaCursor::in(const char *location) { 37 where.push(location); 38 } 39 40 void SchemaCursor::out() { 41 where.pop(); 42 } 43 44 SchemaCursor *SchemaCursor::skipWhiteSpace() { 45 while (*ptr == ' ' || *ptr == '\n' || *ptr == '\t') { 46 step(1); 47 } 48 return this; 49 } 50 51 52 SchemaCursor *SchemaCursor::skipIdentifier() { 53 while (peekAlpha() || peekDigit()) { 54 step(1); 55 } 56 return this; 57 } 58 59 void SchemaCursor::step(int count) { 60 while (count--) { 61 ptr++; 62 } 63 } 64 65 bool SchemaCursor::peekAlpha() { 66 skipWhiteSpace(); 67 return (::isalpha(*ptr)); 68 } 69 70 bool SchemaCursor::peekDigit() { 71 skipWhiteSpace(); 72 return (::isdigit(*ptr)); 73 } 74 75 bool SchemaCursor::is(const char ch) { 76 skipWhiteSpace(); 77 if (*ptr == ch) { 78 step(1); 79 return true; 80 } 81 return false; 82 } 83 84 bool SchemaCursor::isColon() { 85 return is(':'); 86 } 87 88 bool SchemaCursor::expect(char ch, const char *context, int line) { 89 if (is(ch)) { 90 return true; 91 } 92 if (!where.empty()) { 93 std::cerr << where.top() << " "; 94 } 95 std::cerr << "@" << line << ": parse error expecting '" << ch << "' " << context << " looking at " << ptr << 96 std::endl; 97 // exit(1); 98 return false; 99 } 100 101 bool SchemaCursor::expect(const char ch, const int line) { 102 return expect(ch, "", line); 103 } 104 105 bool SchemaCursor::expectDigit(const char *context, const int line) { 106 if (::isdigit(*ptr)) { 107 return true; 108 } 109 if (!where.empty()) { 110 std::cerr << where.top() << " "; 111 } 112 std::cerr << "@" << line << ": parse error expecting digit " << context << " looking at " << ptr << std::endl; 113 // exit(1); 114 return false; 115 } 116 117 bool SchemaCursor::expectAlpha(const char *context, const int line) { 118 if (::isalpha(*ptr)) { 119 return true; 120 } 121 if (!where.empty()) { 122 std::cerr << where.top() << " "; 123 } 124 std::cerr << "@" << line << ": parse error expecting alpha " << context << " looking at " << ptr << std::endl; 125 // exit(1); 126 return false; 127 } 128 129 bool SchemaCursor::isEither(const char ch1, const char ch2, char *actual) { 130 skipWhiteSpace(); 131 if (*ptr == ch1 || *ptr == ch2) { 132 step(1); 133 *actual = *ptr; 134 return true; 135 } 136 return false; 137 } 138 139 void SchemaCursor::expectEither(const char ch1, const char ch2, char *actual, const int line) { 140 skipWhiteSpace(); 141 if (*ptr == ch1 || *ptr == ch2) { 142 step(1); 143 *actual = *ptr; 144 return; 145 } 146 if (!where.empty()) { 147 std::cerr << where.top() << " "; 148 } 149 std::cerr << "@" << line << ": parse error expecting '" << ch1 << "' or '" << ch2 << "' looking at " << ptr << 150 std::endl; 151 exit(1); 152 } 153 154 int SchemaCursor::getInt() { 155 const int value = *ptr - '0'; 156 step(1); 157 if (peekDigit()) { 158 return value * 10 + getInt(); 159 } 160 return value; 161 } 162 163 long SchemaCursor::getLong() { 164 const long value = *ptr - '0'; 165 step(1); 166 if (peekDigit()) { 167 return value * 10 + getLong(); 168 } 169 return value; 170 } 171 172 char *SchemaCursor::getIdentifier() { 173 const char *identifierStart = ptr; 174 skipIdentifier(); 175 const size_t len = ptr - identifierStart; 176 auto identifier = new char[len + 1]; 177 memcpy(identifier, identifierStart, len); 178 identifier[len] = '\0'; 179 return identifier; 180 } 181 182 void SchemaCursor::error(std::ostream &ostream, const char *file, const int line, const char *str) const { 183 ostream << file << ":" << "@" << line << ": parse error " << str << " looking at " << ptr << std::endl; 184 exit(1); 185 }