Last change
on this file since 8dc6f84 was
03cdad6,
checked in by Thierry Delisle <tdelisle@…>, 3 years ago
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Added range-parser example.
I plan to reuse it to parse cpu device data.
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-
Property mode set to
100644
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File size:
1.4 KB
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Rev | Line | |
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[03cdad6] | 1 | #include <stdio.h> |
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| 2 | #include <fstream.hfa> |
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| 3 | #include <coroutine.hfa> |
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| 4 | |
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| 5 | coroutine RangeParser { |
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| 6 | const char * text; |
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| 7 | int com; |
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| 8 | }; |
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| 9 | |
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| 10 | void ?{}(RangeParser & this, const char * text) { |
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| 11 | this.text = text; |
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| 12 | } |
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| 13 | |
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| 14 | static inline void push(RangeParser & this, int val) { this.com = val; suspend; } |
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| 15 | static inline int next(RangeParser & this) { return resume(this).com; } |
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| 16 | |
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| 17 | void main(RangeParser & this) { |
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| 18 | for() { |
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| 19 | int start = -1, stop = -1; |
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| 20 | int start_len = -1, stop_len = -1; |
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| 21 | int ret = sscanf(this.text, "%u%n-%u%n", &start, &start_len, &stop, &stop_len); |
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| 22 | switch(ret) { |
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| 23 | case 0: |
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| 24 | // Not a range, maybe a comma? |
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| 25 | if(this.text[0] == ',') { |
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| 26 | this.text ++; |
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| 27 | continue; |
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| 28 | } |
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| 29 | |
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| 30 | serr | "Error: unexpected character in next range: '" | this.text |"'"; |
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| 31 | exit(2); |
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| 32 | case 1: |
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| 33 | // Only one value, push it! |
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| 34 | push(this, start); |
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| 35 | this.text += start_len; |
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| 36 | break; |
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| 37 | case 2: |
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| 38 | if(start > stop) { |
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| 39 | serr | "Error: next range out of order '" | this.text |"'"; |
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| 40 | exit(2); |
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| 41 | } |
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| 42 | for(int i = start; i <= stop; i++) { |
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| 43 | push(this, i); |
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| 44 | } |
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| 45 | this.text += stop_len; |
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| 46 | break; |
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| 47 | default: |
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| 48 | serr | "Error reading next block: '" | this.text |"', returned" | ret; |
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| 49 | exit(2); |
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| 50 | } |
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| 51 | |
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| 52 | if(this.text[0] == '\0') break; |
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| 53 | } |
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| 54 | this.com = -1; |
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| 55 | } |
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| 56 | |
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| 57 | int main(int argc, char * argv[]) { |
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| 58 | if(argc != 2) { |
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| 59 | serr | "Usage:" | argv[0] | "range"; |
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| 60 | return 1; |
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| 61 | } |
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| 62 | |
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| 63 | RangeParser rp = { argv[1] }; |
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| 64 | |
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| 65 | for() { |
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| 66 | int i = next(rp); |
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| 67 | if(i < 0) break; |
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| 68 | sout | i | nonl; |
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| 69 | } |
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| 70 | sout | nl; |
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| 71 | } |
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