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annotate trunk/src/dil/Location.d @ 577:9e811db780a6

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Moved LexerFuncs.d to package 'lexer'.
author Aziz K?ksal <aziz.koeksal@gmail.com>
date Sat, 05 Jan 2008 17:01:15 +0100
parents 86fa0d36da51
children 7173ece1b696
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1 /++
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2 Author: Aziz Köksal
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3 License: GPL3
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4 +/
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5 module dil.Location;
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6 import dil.lexer.Funcs;
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7 import dil.Unicode;
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8 import common;
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9
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10 final class Location
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11 {
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12 char[] filePath;
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13 size_t lineNum;
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14 char* lineBegin, to; // Used to calculate column.
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15
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16 this(char[] filePath, size_t lineNum)
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17 {
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18 set(filePath, lineNum);
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19 }
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20
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21 this(char[] filePath, size_t lineNum, char* lineBegin, char* to)
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22 {
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23 set(filePath, lineNum, lineBegin, to);
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24 }
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25
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26 Location clone()
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27 {
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28 return new Location(filePath, lineNum, lineBegin, to);
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29 }
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31 void set(char[] filePath, size_t lineNum)
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32 {
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33 set(filePath, lineNum, null, null);
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34 }
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36 void set(char[] filePath, size_t lineNum, char* lineBegin, char* to)
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37 {
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38 this.filePath = filePath;
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39 set(lineNum, lineBegin, to);
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40 }
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41
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42 void set(size_t lineNum, char* lineBegin, char* to)
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43 {
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44 assert(lineBegin <= to);
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45 this.lineNum = lineNum;
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46 this.lineBegin = lineBegin;
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47 this.to = to;
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48 }
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49
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50 void setFilePath(char[] filePath)
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51 {
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52 this.filePath = filePath;
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53 }
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54
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55 /++
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56 This is a primitive method to count the number of characters in a string.
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57 Unicode compound characters and other special characters are not
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58 taken into account.
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59 +/
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60 uint calculateColumn()
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61 {
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62 uint col;
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63 auto p = lineBegin;
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64 if (!p)
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65 return 0;
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66 for (; p <= to; ++p)
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67 {
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68 assert(delegate ()
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69 {
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70 // Check that there is no newline between p and to.
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71 // But 'to' may point to a newline.
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72 if (p != to && isNewline(*p))
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73 return false;
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74 if (to-p >= 2 && isUnicodeNewline(p))
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75 return false;
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76 return true;
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77 }() == true
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78 );
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79
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80 // Skip this byte if it is a trail byte of a UTF-8 sequence.
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81 if (isTrailByte(*p))
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82 continue; // *p == 0b10xx_xxxx
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83 // Only count ASCII characters and the first byte of a UTF-8 sequence.
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84 ++col;
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85 }
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86 return col;
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87 }
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88 alias calculateColumn colNum;
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89 }