| Elliott Hughes | c0e919c | 2015-02-04 14:46:36 -0800 | [diff] [blame] | 1 | #include "parser.h" |
| 2 | |
| The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 3 | int next_token(struct parse_state *state) |
| 4 | { |
| 5 | char *x = state->ptr; |
| 6 | char *s; |
| 7 | |
| 8 | if (state->nexttoken) { |
| 9 | int t = state->nexttoken; |
| 10 | state->nexttoken = 0; |
| 11 | return t; |
| 12 | } |
| 13 | |
| 14 | for (;;) { |
| 15 | switch (*x) { |
| 16 | case 0: |
| 17 | state->ptr = x; |
| 18 | return T_EOF; |
| 19 | case '\n': |
| The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 20 | x++; |
| 21 | state->ptr = x; |
| 22 | return T_NEWLINE; |
| 23 | case ' ': |
| 24 | case '\t': |
| 25 | case '\r': |
| 26 | x++; |
| 27 | continue; |
| 28 | case '#': |
| 29 | while (*x && (*x != '\n')) x++; |
| Bruce Beare | 1be6968 | 2010-12-26 09:55:10 -0800 | [diff] [blame] | 30 | if (*x == '\n') { |
| 31 | state->ptr = x+1; |
| 32 | return T_NEWLINE; |
| 33 | } else { |
| 34 | state->ptr = x; |
| 35 | return T_EOF; |
| 36 | } |
| The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 37 | default: |
| 38 | goto text; |
| 39 | } |
| 40 | } |
| 41 | |
| 42 | textdone: |
| 43 | state->ptr = x; |
| 44 | *s = 0; |
| 45 | return T_TEXT; |
| 46 | text: |
| 47 | state->text = s = x; |
| 48 | textresume: |
| 49 | for (;;) { |
| 50 | switch (*x) { |
| 51 | case 0: |
| 52 | goto textdone; |
| 53 | case ' ': |
| 54 | case '\t': |
| 55 | case '\r': |
| 56 | x++; |
| 57 | goto textdone; |
| 58 | case '\n': |
| 59 | state->nexttoken = T_NEWLINE; |
| 60 | x++; |
| 61 | goto textdone; |
| 62 | case '"': |
| 63 | x++; |
| 64 | for (;;) { |
| 65 | switch (*x) { |
| 66 | case 0: |
| 67 | /* unterminated quoted thing */ |
| 68 | state->ptr = x; |
| 69 | return T_EOF; |
| 70 | case '"': |
| 71 | x++; |
| 72 | goto textresume; |
| 73 | default: |
| 74 | *s++ = *x++; |
| 75 | } |
| 76 | } |
| 77 | break; |
| 78 | case '\\': |
| 79 | x++; |
| 80 | switch (*x) { |
| 81 | case 0: |
| 82 | goto textdone; |
| 83 | case 'n': |
| 84 | *s++ = '\n'; |
| 85 | break; |
| 86 | case 'r': |
| 87 | *s++ = '\r'; |
| 88 | break; |
| 89 | case 't': |
| 90 | *s++ = '\t'; |
| 91 | break; |
| 92 | case '\\': |
| 93 | *s++ = '\\'; |
| 94 | break; |
| 95 | case '\r': |
| 96 | /* \ <cr> <lf> -> line continuation */ |
| 97 | if (x[1] != '\n') { |
| 98 | x++; |
| 99 | continue; |
| 100 | } |
| 101 | case '\n': |
| 102 | /* \ <lf> -> line continuation */ |
| 103 | state->line++; |
| 104 | x++; |
| 105 | /* eat any extra whitespace */ |
| 106 | while((*x == ' ') || (*x == '\t')) x++; |
| 107 | continue; |
| 108 | default: |
| 109 | /* unknown escape -- just copy */ |
| 110 | *s++ = *x++; |
| 111 | } |
| 112 | continue; |
| 113 | default: |
| 114 | *s++ = *x++; |
| 115 | } |
| 116 | } |
| 117 | return T_EOF; |
| 118 | } |