annotate lucene/src/luan/modules/lucene/queryparser/Parser.java @ 730:01e68da6983b

add sane-lucene-queryparser source to luan
author Franklin Schmidt <fschmidt@gmail.com>
date Fri, 10 Jun 2016 15:41:15 -0600
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1 package luan.modules.lucene.queryparser;
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2
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3 /**
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4 * A general parser utility class.
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5 * This class is not needed to use SaneQueryParser.
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6 */
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7 public class Parser {
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8 public final String text;
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9 private final int len;
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10 private int[] stack = new int[256];
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11 private int frame = 0;
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12 private int iHigh;
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13
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14 Parser(String text) {
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15 this.text = text;
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16 this.len = text.length();
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17 }
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18
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19 private int i() {
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20 return stack[frame];
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21 }
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22
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23 private void i(int i) {
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24 stack[frame] += i;
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25 if( iHigh < stack[frame] )
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26 iHigh = stack[frame];
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27 }
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28
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29 public int begin() {
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30 frame++;
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31 if( frame == stack.length ) {
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32 int[] a = new int[2*frame];
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33 System.arraycopy(stack,0,a,0,frame);
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34 stack = a;
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35 }
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36 stack[frame] = stack[frame-1];
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37 return i();
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38 }
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39
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40 public void rollback() {
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41 stack[frame] = stack[frame-1];
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42 }
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43
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44 public <T> T success(T t) {
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45 success();
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46 return t;
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47 }
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48
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49 public boolean success() {
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50 frame--;
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51 stack[frame] = stack[frame+1];
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52 return true;
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53 }
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54
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55 public <T> T failure(T t) {
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56 failure();
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57 return t;
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58 }
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59
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60 public boolean failure() {
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61 frame--;
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62 return false;
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63 }
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64
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65 public int currentIndex() {
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66 return i();
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67 }
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68
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69 public int errorIndex() {
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70 return frame > 0 ? stack[frame-1] : 0;
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71 }
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72
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73 public int highIndex() {
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74 return iHigh;
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75 }
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76
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77 public char lastChar() {
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78 return text.charAt(i()-1);
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79 }
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80
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81 public char currentChar() {
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82 return text.charAt(i());
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83 }
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84
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85 public boolean endOfInput() {
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86 return i() >= len;
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87 }
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88
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89 public boolean match(char c) {
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90 if( endOfInput() || text.charAt(i()) != c )
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91 return false;
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92 i(1);
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93 return true;
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94 }
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95
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96 public boolean match(String s) {
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97 int n = s.length();
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98 if( !text.regionMatches(i(),s,0,n) )
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99 return false;
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100 i(n);
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101 return true;
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102 }
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103
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104 public boolean matchIgnoreCase(String s) {
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105 int n = s.length();
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106 if( !text.regionMatches(true,i(),s,0,n) )
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107 return false;
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108 i(n);
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109 return true;
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110 }
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111
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112 public boolean anyOf(String s) {
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113 if( endOfInput() || s.indexOf(text.charAt(i())) == -1 )
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114 return false;
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115 i(1);
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116 return true;
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117 }
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118
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119 public boolean noneOf(String s) {
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120 if( endOfInput() || s.indexOf(text.charAt(i())) != -1 )
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121 return false;
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122 i(1);
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123 return true;
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124 }
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125
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126 public boolean inCharRange(char cLow, char cHigh) {
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127 if( endOfInput() )
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128 return false;
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129 char c = text.charAt(i());
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130 if( !(cLow <= c && c <= cHigh) )
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131 return false;
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132 i(1);
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133 return true;
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134 }
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135
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136 public boolean anyChar() {
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137 if( endOfInput() )
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138 return false;
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139 i(1);
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140 return true;
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141 }
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142
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143 public boolean test(char c) {
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144 return !endOfInput() && text.charAt(i()) == c;
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145 }
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146
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147 public boolean test(String s) {
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148 return text.regionMatches(i(),s,0,s.length());
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149 }
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150
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151 public String textFrom(int start) {
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152 return text.substring(start,i());
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153 }
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154
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155 }