Mercurial Hosting > luan
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 |
| rev | line source |
|---|---|
|
1402
27efb1fcbcb5
move luan.lib to goodjava
Franklin Schmidt <fschmidt@gmail.com>
parents:
1212
diff
changeset
|
1 package goodjava.parser; |
| 585 | 2 |
| 3 | |
| 4 public class Parser { | |
| 5 public final String text; | |
| 6 private final int len; | |
| 7 private int[] stack = new int[256]; | |
| 8 private int frame = 0; | |
| 9 private int iHigh; | |
| 10 | |
|
1110
38a42f437fd2
queryparser now uses parsers.Parser
Franklin Schmidt <fschmidt@gmail.com>
parents:
775
diff
changeset
|
11 public Parser(String text) { |
| 585 | 12 this.text = text; |
| 13 this.len = text.length(); | |
| 14 } | |
| 15 | |
| 16 private int i() { | |
| 17 return stack[frame]; | |
| 18 } | |
| 19 | |
| 20 private void i(int i) { | |
| 21 stack[frame] += i; | |
| 22 if( iHigh < stack[frame] ) | |
| 23 iHigh = stack[frame]; | |
| 24 } | |
| 25 | |
| 26 public int begin() { | |
| 27 frame++; | |
| 28 if( frame == stack.length ) { | |
| 29 int[] a = new int[2*frame]; | |
| 30 System.arraycopy(stack,0,a,0,frame); | |
| 31 stack = a; | |
| 32 } | |
| 33 stack[frame] = stack[frame-1]; | |
| 34 return i(); | |
| 35 } | |
| 36 | |
| 37 public void rollback() { | |
|
1212
220228bf1af9
better urlDecode error handling
Franklin Schmidt <fschmidt@gmail.com>
parents:
1111
diff
changeset
|
38 stack[frame] = frame==0 ? 0 : stack[frame-1]; |
| 585 | 39 } |
| 40 | |
| 41 public <T> T success(T t) { | |
| 42 success(); | |
| 43 return t; | |
| 44 } | |
| 45 | |
| 46 public boolean success() { | |
| 47 frame--; | |
| 48 stack[frame] = stack[frame+1]; | |
| 49 return true; | |
| 50 } | |
| 51 | |
| 52 public <T> T failure(T t) { | |
| 53 failure(); | |
| 54 return t; | |
| 55 } | |
| 56 | |
| 57 public boolean failure() { | |
| 58 frame--; | |
| 59 return false; | |
| 60 } | |
| 61 | |
| 62 public int currentIndex() { | |
| 63 return i(); | |
| 64 } | |
| 65 /* | |
| 66 public int errorIndex() { | |
| 67 return frame > 0 ? stack[frame-1] : 0; | |
| 68 } | |
| 69 */ | |
| 70 public int highIndex() { | |
| 71 return iHigh; | |
| 72 } | |
| 73 | |
| 74 public char lastChar() { | |
| 75 return text.charAt(i()-1); | |
| 76 } | |
| 77 | |
| 78 public char currentChar() { | |
| 79 return text.charAt(i()); | |
| 80 } | |
| 81 | |
| 82 public boolean endOfInput() { | |
| 83 return i() >= len; | |
| 84 } | |
| 85 | |
| 86 public boolean match(char c) { | |
| 87 if( endOfInput() || text.charAt(i()) != c ) | |
| 88 return false; | |
| 89 i(1); | |
| 90 return true; | |
| 91 } | |
| 92 | |
| 93 public boolean match(String s) { | |
| 94 int n = s.length(); | |
| 95 if( !text.regionMatches(i(),s,0,n) ) | |
| 96 return false; | |
| 97 i(n); | |
| 98 return true; | |
| 99 } | |
| 100 | |
| 101 public boolean matchIgnoreCase(String s) { | |
| 102 int n = s.length(); | |
| 103 if( !text.regionMatches(true,i(),s,0,n) ) | |
| 104 return false; | |
| 105 i(n); | |
| 106 return true; | |
| 107 } | |
| 108 | |
| 109 public boolean anyOf(String s) { | |
| 110 if( endOfInput() || s.indexOf(text.charAt(i())) == -1 ) | |
| 111 return false; | |
| 112 i(1); | |
| 113 return true; | |
| 114 } | |
| 115 | |
| 116 public boolean noneOf(String s) { | |
| 117 if( endOfInput() || s.indexOf(text.charAt(i())) != -1 ) | |
| 118 return false; | |
| 119 i(1); | |
| 120 return true; | |
| 121 } | |
| 122 | |
| 123 public boolean inCharRange(char cLow, char cHigh) { | |
| 124 if( endOfInput() ) | |
| 125 return false; | |
| 126 char c = text.charAt(i()); | |
| 127 if( !(cLow <= c && c <= cHigh) ) | |
| 128 return false; | |
| 129 i(1); | |
| 130 return true; | |
| 131 } | |
| 132 | |
| 133 public boolean anyChar() { | |
| 134 if( endOfInput() ) | |
| 135 return false; | |
| 136 i(1); | |
| 137 return true; | |
| 138 } | |
| 139 | |
| 140 public boolean test(char c) { | |
| 141 return !endOfInput() && text.charAt(i()) == c; | |
| 142 } | |
| 143 | |
| 144 public boolean test(String s) { | |
| 145 return text.regionMatches(i(),s,0,s.length()); | |
| 146 } | |
| 147 | |
| 148 public boolean testIgnoreCase(String s) { | |
| 149 return text.regionMatches(true,i(),s,0,s.length()); | |
| 150 } | |
| 151 | |
| 152 public String textFrom(int start) { | |
| 153 return text.substring(start,i()); | |
| 154 } | |
| 155 | |
| 156 } |