annotate src/goodjava/parser/Parser.java @ 1523:2052c8a548dd

minor
author Franklin Schmidt <fschmidt@gmail.com>
date Mon, 06 Jul 2020 11:30:02 -0600
parents 27efb1fcbcb5
children
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1 package goodjava.parser;
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2
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3
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4 public class Parser {
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5 public final String text;
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6 private final int len;
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7 private int[] stack = new int[256];
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8 private int frame = 0;
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9 private int iHigh;
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10
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11 public Parser(String text) {
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12 this.text = text;
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13 this.len = text.length();
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14 }
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15
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16 private int i() {
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17 return stack[frame];
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18 }
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19
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20 private void i(int i) {
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21 stack[frame] += i;
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22 if( iHigh < stack[frame] )
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23 iHigh = stack[frame];
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24 }
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25
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26 public int begin() {
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27 frame++;
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28 if( frame == stack.length ) {
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29 int[] a = new int[2*frame];
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30 System.arraycopy(stack,0,a,0,frame);
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31 stack = a;
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32 }
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33 stack[frame] = stack[frame-1];
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34 return i();
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35 }
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36
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37 public void rollback() {
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38 stack[frame] = frame==0 ? 0 : stack[frame-1];
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39 }
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40
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41 public <T> T success(T t) {
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42 success();
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43 return t;
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44 }
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46 public boolean success() {
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47 frame--;
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48 stack[frame] = stack[frame+1];
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49 return true;
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50 }
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51
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52 public <T> T failure(T t) {
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53 failure();
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54 return t;
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55 }
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57 public boolean failure() {
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58 frame--;
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59 return false;
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60 }
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61
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62 public int currentIndex() {
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63 return i();
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64 }
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65 /*
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66 public int errorIndex() {
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67 return frame > 0 ? stack[frame-1] : 0;
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68 }
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69 */
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70 public int highIndex() {
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71 return iHigh;
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72 }
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73
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74 public char lastChar() {
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75 return text.charAt(i()-1);
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76 }
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77
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78 public char currentChar() {
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79 return text.charAt(i());
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80 }
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81
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82 public boolean endOfInput() {
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83 return i() >= len;
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84 }
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85
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86 public boolean match(char c) {
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87 if( endOfInput() || text.charAt(i()) != c )
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88 return false;
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89 i(1);
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90 return true;
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91 }
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93 public boolean match(String s) {
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94 int n = s.length();
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95 if( !text.regionMatches(i(),s,0,n) )
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96 return false;
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97 i(n);
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98 return true;
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99 }
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101 public boolean matchIgnoreCase(String s) {
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102 int n = s.length();
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103 if( !text.regionMatches(true,i(),s,0,n) )
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104 return false;
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105 i(n);
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106 return true;
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107 }
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108
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109 public boolean anyOf(String s) {
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110 if( endOfInput() || s.indexOf(text.charAt(i())) == -1 )
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111 return false;
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112 i(1);
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113 return true;
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114 }
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115
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116 public boolean noneOf(String s) {
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117 if( endOfInput() || s.indexOf(text.charAt(i())) != -1 )
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118 return false;
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119 i(1);
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120 return true;
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121 }
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122
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123 public boolean inCharRange(char cLow, char cHigh) {
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124 if( endOfInput() )
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125 return false;
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126 char c = text.charAt(i());
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127 if( !(cLow <= c && c <= cHigh) )
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128 return false;
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129 i(1);
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130 return true;
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131 }
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132
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133 public boolean anyChar() {
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134 if( endOfInput() )
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135 return false;
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136 i(1);
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137 return true;
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138 }
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140 public boolean test(char c) {
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141 return !endOfInput() && text.charAt(i()) == c;
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142 }
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144 public boolean test(String s) {
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145 return text.regionMatches(i(),s,0,s.length());
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146 }
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148 public boolean testIgnoreCase(String s) {
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149 return text.regionMatches(true,i(),s,0,s.length());
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150 }
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151
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152 public String textFrom(int start) {
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153 return text.substring(start,i());
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154 }
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155
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156 }