Last change
on this file since f9da761 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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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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