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annotate src/luan/parser/Parser.java @ 118:735708619119

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add Debug.debug() git-svn-id: https://luan-java.googlecode.com/svn/trunk@119 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Sun, 01 Jun 2014 07:07:31 +0000
parents 754e6030c029
children cc3a0578edac
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1 package luan.parser;
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3 import luan.LuanSource;
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5
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6 public final class Parser {
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7 private final LuanSource src;
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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 public Parser(LuanSource src) {
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15 this.src = src;
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16 this.text = src.text;
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17 this.len = text.length();
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18 }
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20 private int i() {
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21 return stack[frame];
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22 }
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24 private void i(int i) {
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25 stack[frame] += i;
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26 if( iHigh < stack[frame] )
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27 iHigh = stack[frame];
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28 }
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30 public int begin() {
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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 frame++;
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37 stack[frame] = stack[frame-1];
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38 return i();
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39 }
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41 public void rollback() {
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42 stack[frame] = stack[frame-1];
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43 }
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44
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45 public <T> T success(T t) {
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46 success();
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47 return t;
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48 }
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49
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50 public boolean success() {
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51 frame--;
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52 stack[frame] = stack[frame+1];
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53 return true;
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54 }
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56 public <T> T failure(T t) {
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57 failure();
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58 return t;
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59 }
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61 public boolean failure() {
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62 frame--;
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63 return false;
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64 }
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65
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66 public ParseException exception(String msg) {
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67 return new ParseException(msg,src,i(),iHigh);
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68 }
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69
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70 public ParseException exception() {
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71 return exception("Invalid input");
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72 }
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74 public int currentIndex() {
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75 return i();
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76 }
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78 public char lastChar() {
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79 return text.charAt(i()-1);
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80 }
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81
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82 public char currentChar() {
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83 return text.charAt(i());
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84 }
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85
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86 public boolean endOfInput() {
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87 return i() >= len;
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88 }
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89
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90 public boolean match(char c) {
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91 if( endOfInput() || text.charAt(i()) != c )
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92 return false;
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93 i(1);
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94 return true;
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95 }
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96
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97 public boolean match(String s) {
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98 int n = s.length();
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99 if( !text.regionMatches(i(),s,0,n) )
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100 return false;
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101 i(n);
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102 return true;
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103 }
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104
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105 public boolean matchIgnoreCase(String s) {
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106 int n = s.length();
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107 if( !text.regionMatches(true,i(),s,0,n) )
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108 return false;
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109 i(n);
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110 return true;
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111 }
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112
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113 public boolean anyOf(String s) {
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114 if( endOfInput() || s.indexOf(text.charAt(i())) == -1 )
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115 return false;
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116 i(1);
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117 return true;
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118 }
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119
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120 public boolean noneOf(String s) {
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121 if( endOfInput() || s.indexOf(text.charAt(i())) != -1 )
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122 return false;
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123 i(1);
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124 return true;
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125 }
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126
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127 public boolean inCharRange(char cLow, char cHigh) {
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128 if( endOfInput() )
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129 return false;
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130 char c = text.charAt(i());
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131 if( !(cLow <= c && c <= cHigh) )
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132 return false;
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133 i(1);
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134 return true;
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135 }
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136
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137 public boolean anyChar() {
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138 if( endOfInput() )
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139 return false;
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140 i(1);
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141 return true;
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142 }
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143
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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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147
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148 public String textFrom(int start) {
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149 return text.substring(start,i());
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150 }
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151
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152 }