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annotate src/main/java/nl/cwi/monetdb/mcl/parser/TupleLineParser.java @ 0:a5a898f6886c

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Copy of MonetDB java directory changeset e6e32756ad31.
author Sjoerd Mullender <sjoerd@acm.org>
date Wed, 21 Sep 2016 09:34:48 +0200 (2016-09-21)
parents
children 57978db4ee57 b9b35ca2eec2
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
0
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1 /*
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2 * This Source Code Form is subject to the terms of the Mozilla Public
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3 * License, v. 2.0. If a copy of the MPL was not distributed with this
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4 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
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5 *
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6 * Copyright 1997 - July 2008 CWI, August 2008 - 2016 MonetDB B.V.
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7 */
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8
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9 package nl.cwi.monetdb.mcl.parser;
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10
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11 /**
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12 * The TupleLineParser extracts the values from a given tuple. The
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13 * number of values that are expected are known upfront to speed up
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14 * allocation and validation.
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15 *
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16 * @author Fabian Groffen <Fabian.Groffen>
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17 */
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18 public class TupleLineParser extends MCLParser {
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19 /**
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20 * Constructs a TupleLineParser which expects columncount columns.
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21 *
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22 * @param columncount the number of columns in the to be parsed string
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23 */
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24 public TupleLineParser(int columncount) {
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25 super(columncount);
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26 }
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27
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28 /**
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29 * Parses the given String source as tuple line. If source cannot
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30 * be parsed, a ParseException is thrown. The columncount argument
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31 * is used for allocation of the returned array. While this seems
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32 * illogical, the caller should know this size, since the
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33 * StartOfHeader contains this information.
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34 *
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35 * @param source a String which should be parsed
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36 * @return 0, as there is no 'type' of TupleLine
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37 * @throws ParseException if an error occurs during parsing
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38 */
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39 @Override
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40 public int parse(String source) throws MCLParseException {
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41 int len = source.length();
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42 char[] chrLine = new char[len];
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43 source.getChars(0, len, chrLine, 0);
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44
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45 // first detect whether this is a single value line (=) or a
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46 // real tuple ([)
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47 if (chrLine[0] == '=') {
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48 if (values.length != 1)
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49 throw new MCLParseException(values.length +
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50 " columns expected, but only single value found");
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51
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52 // return the whole string but the leading =
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53 values[0] = source.substring(1);
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54
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55 // reset colnr
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56 reset();
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57
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58 return 0;
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59 }
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60
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61 // extract separate fields by examining string, char for char
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62 boolean inString = false, escaped = false;
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63 int cursor = 2, column = 0, i = 2;
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64 StringBuilder uesc = new StringBuilder();
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65 for (; i < len; i++) {
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66 switch(chrLine[i]) {
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67 default:
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68 escaped = false;
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69 break;
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70 case '\\':
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71 escaped = !escaped;
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72 break;
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73 case '"':
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74 /**
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75 * If all strings are wrapped between two quotes, a \" can
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76 * never exist outside a string. Thus if we believe that we
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77 * are not within a string, we can safely assume we're about
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78 * to enter a string if we find a quote.
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79 * If we are in a string we should stop being in a string if
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80 * we find a quote which is not prefixed by a \, for that
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81 * would be an escaped quote. However, a nasty situation can
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82 * occur where the string is like "test \\" as obvious, a
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83 * test for a \ in front of a " doesn't hold here for all
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84 * cases. Because "test \\\"" can exist as well, we need to
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85 * know if a quote is prefixed by an escaping slash or not.
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86 */
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87 if (!inString) {
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88 inString = true;
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89 } else if (!escaped) {
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90 inString = false;
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91 }
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92
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93 // reset escaped flag
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94 escaped = false;
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95 break;
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96 case '\t':
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97 if (!inString &&
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98 (i > 0 && chrLine[i - 1] == ',') ||
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99 (i + 1 == len - 1 && chrLine[++i] == ']')) // dirty
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100 {
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101 // split!
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102 if (chrLine[cursor] == '"' &&
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103 chrLine[i - 2] == '"')
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104 {
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105 // reuse the StringBuilder by cleaning it
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106 uesc.delete(0, uesc.length());
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107 // prevent capacity increasements
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108 uesc.ensureCapacity((i - 2) - (cursor + 1));
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109 for (int pos = cursor + 1; pos < i - 2; pos++) {
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110 if (chrLine[pos] == '\\' && pos + 1 < i - 2) {
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111 pos++;
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112 // strToStr and strFromStr in gdk_atoms.mx only
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113 // support \t \n \\ \" and \377
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114 switch (chrLine[pos]) {
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115 case '\\':
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116 uesc.append('\\');
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117 break;
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118 case 'n':
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119 uesc.append('\n');
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120 break;
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121 case 't':
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122 uesc.append('\t');
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123 break;
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124 case '"':
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125 uesc.append('"');
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126 break;
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127 case '0': case '1': case '2': case '3':
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128 // this could be an octal number, let's check it out
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129 if (pos + 2 < i - 2 &&
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130 chrLine[pos + 1] >= '0' && chrLine[pos + 1] <= '7' &&
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131 chrLine[pos + 2] >= '0' && chrLine[pos + 2] <= '7'
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132 ) {
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133 // we got the number!
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134 try {
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135 uesc.append((char)(Integer.parseInt("" + chrLine[pos] + chrLine[pos + 1] + chrLine[pos + 2], 8)));
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136 pos += 2;
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137 } catch (NumberFormatException e) {
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138 // hmmm, this point should never be reached actually...
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139 throw new AssertionError("Flow error, should never try to parse non-number");
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140 }
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141 } else {
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142 // do default action if number seems not to be correct
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143 uesc.append(chrLine[pos]);
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144 }
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145 break;
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146 default:
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147 // this is wrong, just ignore the escape, and print the char
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148 uesc.append(chrLine[pos]);
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149 break;
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150 }
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151 } else {
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152 uesc.append(chrLine[pos]);
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153 }
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154 }
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155
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156 // put the unescaped string in the right place
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157 values[column++] = uesc.toString();
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158 } else if ((i - 1) - cursor == 4 &&
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159 source.indexOf("NULL", cursor) == cursor)
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160 {
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161 values[column++] = null;
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162 } else {
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163 values[column++] =
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164 source.substring(cursor, i - 1);
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165 }
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166 cursor = i + 1;
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167 }
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168
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169 // reset escaped flag
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170 escaped = false;
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171 break;
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172 }
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173 }
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174 // check if this result is of the size we expected it to be
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175 if (column != values.length)
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176 throw new MCLParseException("illegal result length: " + column + "\nlast read: " + (column > 0 ? values[column - 1] : "<none>"));
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177
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178 // reset colnr
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179 reset();
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180
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181 return 0;
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182 }
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183 }