| Tom Cherry | 67dee62 | 2017-07-27 12:54:48 -0700 | [diff] [blame] | 1 | #include "tokenizer.h" |
| 2 | |
| Tom Cherry | ae8a6b9 | 2018-09-19 14:34:51 -0700 | [diff] [blame] | 3 | #include <android-base/macros.h> |
| 4 | |
| Tom Cherry | 67dee62 | 2017-07-27 12:54:48 -0700 | [diff] [blame] | 5 | namespace android { |
| 6 | namespace init { |
| 7 | |
| 8 | int next_token(struct parse_state *state) |
| 9 | { |
| 10 | char *x = state->ptr; |
| 11 | char *s; |
| 12 | |
| 13 | if (state->nexttoken) { |
| 14 | int t = state->nexttoken; |
| 15 | state->nexttoken = 0; |
| 16 | return t; |
| 17 | } |
| 18 | |
| 19 | for (;;) { |
| 20 | switch (*x) { |
| 21 | case 0: |
| 22 | state->ptr = x; |
| 23 | return T_EOF; |
| 24 | case '\n': |
| 25 | x++; |
| 26 | state->ptr = x; |
| 27 | return T_NEWLINE; |
| 28 | case ' ': |
| 29 | case '\t': |
| 30 | case '\r': |
| 31 | x++; |
| 32 | continue; |
| 33 | case '#': |
| 34 | while (*x && (*x != '\n')) x++; |
| 35 | if (*x == '\n') { |
| 36 | state->ptr = x+1; |
| 37 | return T_NEWLINE; |
| 38 | } else { |
| 39 | state->ptr = x; |
| 40 | return T_EOF; |
| 41 | } |
| 42 | default: |
| 43 | goto text; |
| 44 | } |
| 45 | } |
| 46 | |
| 47 | textdone: |
| 48 | state->ptr = x; |
| 49 | *s = 0; |
| 50 | return T_TEXT; |
| 51 | text: |
| 52 | state->text = s = x; |
| 53 | textresume: |
| 54 | for (;;) { |
| 55 | switch (*x) { |
| 56 | case 0: |
| 57 | goto textdone; |
| 58 | case ' ': |
| 59 | case '\t': |
| 60 | case '\r': |
| 61 | x++; |
| 62 | goto textdone; |
| 63 | case '\n': |
| 64 | state->nexttoken = T_NEWLINE; |
| 65 | x++; |
| 66 | goto textdone; |
| 67 | case '"': |
| 68 | x++; |
| 69 | for (;;) { |
| 70 | switch (*x) { |
| 71 | case 0: |
| 72 | /* unterminated quoted thing */ |
| 73 | state->ptr = x; |
| 74 | return T_EOF; |
| 75 | case '"': |
| 76 | x++; |
| 77 | goto textresume; |
| 78 | default: |
| 79 | *s++ = *x++; |
| 80 | } |
| 81 | } |
| 82 | break; |
| 83 | case '\\': |
| 84 | x++; |
| 85 | switch (*x) { |
| 86 | case 0: |
| 87 | goto textdone; |
| 88 | case 'n': |
| 89 | *s++ = '\n'; |
| liwugang | 332afef | 2018-06-25 16:04:33 +0800 | [diff] [blame] | 90 | x++; |
| Tom Cherry | 67dee62 | 2017-07-27 12:54:48 -0700 | [diff] [blame] | 91 | break; |
| 92 | case 'r': |
| 93 | *s++ = '\r'; |
| liwugang | 332afef | 2018-06-25 16:04:33 +0800 | [diff] [blame] | 94 | x++; |
| Tom Cherry | 67dee62 | 2017-07-27 12:54:48 -0700 | [diff] [blame] | 95 | break; |
| 96 | case 't': |
| 97 | *s++ = '\t'; |
| liwugang | 332afef | 2018-06-25 16:04:33 +0800 | [diff] [blame] | 98 | x++; |
| Tom Cherry | 67dee62 | 2017-07-27 12:54:48 -0700 | [diff] [blame] | 99 | break; |
| 100 | case '\\': |
| 101 | *s++ = '\\'; |
| liwugang | 332afef | 2018-06-25 16:04:33 +0800 | [diff] [blame] | 102 | x++; |
| Tom Cherry | 67dee62 | 2017-07-27 12:54:48 -0700 | [diff] [blame] | 103 | break; |
| 104 | case '\r': |
| 105 | /* \ <cr> <lf> -> line continuation */ |
| 106 | if (x[1] != '\n') { |
| 107 | x++; |
| 108 | continue; |
| 109 | } |
| liwugang | 332afef | 2018-06-25 16:04:33 +0800 | [diff] [blame] | 110 | x++; |
| Tom Cherry | ae8a6b9 | 2018-09-19 14:34:51 -0700 | [diff] [blame] | 111 | FALLTHROUGH_INTENDED; |
| Tom Cherry | 67dee62 | 2017-07-27 12:54:48 -0700 | [diff] [blame] | 112 | case '\n': |
| 113 | /* \ <lf> -> line continuation */ |
| 114 | state->line++; |
| 115 | x++; |
| 116 | /* eat any extra whitespace */ |
| 117 | while((*x == ' ') || (*x == '\t')) x++; |
| 118 | continue; |
| 119 | default: |
| 120 | /* unknown escape -- just copy */ |
| 121 | *s++ = *x++; |
| 122 | } |
| 123 | continue; |
| 124 | default: |
| 125 | *s++ = *x++; |
| 126 | } |
| 127 | } |
| 128 | return T_EOF; |
| 129 | } |
| 130 | |
| 131 | } // namespace init |
| 132 | } // namespace android |