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annotate trunk/src/dil/lexer/Funcs.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 trunk/src/dil/LexerFuncs.d@2a8d0ed0d71e
children b6c6baa41267
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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.lexer.Funcs;
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6
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7 const char[3] LS = \u2028; /// Line separator.
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8 const char[3] PS = \u2029; /// Paragraph separator.
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9 const dchar LSd = 0x2028;
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10 const dchar PSd = 0x2029;
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11 static assert(LS[0] == PS[0] && LS[1] == PS[1]);
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12
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13 const uint _Z_ = 26; /// Control+Z
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14
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15 /// Returns true if d is a Unicode line or paragraph separator.
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16 bool isUnicodeNewlineChar(dchar d)
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17 {
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18 return d == LSd || d == PSd;
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19 }
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20
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21 /// Returns true if p points to a line or paragraph separator.
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22 bool isUnicodeNewline(char* p)
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23 {
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24 return *p == LS[0] && p[1] == LS[1] && (p[2] == LS[2] || p[2] == PS[2]);
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25 }
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26
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27 /++
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28 Returns true if p points to the start of a Newline.
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29 Newline: \n | \r | \r\n | LS | PS
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30 +/
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31 bool isNewline(char* p)
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32 {
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33 return *p == '\n' || *p == '\r' || isUnicodeNewline(p);
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34 }
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35
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36 /// Returns if c is a Newline character.
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37 bool isNewline(dchar c)
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38 {
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39 return c == '\n' || c == '\r' || isUnicodeNewlineChar(c);
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40 }
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42 /++
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43 Returns true if p points to an EOF character.
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44 EOF: 0 | _Z_
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45 +/
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46 bool isEOF(dchar c)
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47 {
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48 return c == 0 || c == _Z_;
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49 }
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51 /++
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52 Returns true if p points to the first character of an EndOfLine.
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53 EndOfLine: Newline | EOF
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54 +/
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55 bool isEndOfLine(char* p)
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56 {
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57 return isNewline(p) || isEOF(*p);
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58 }
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59
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60 /++
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61 Scans a Newline and sets p one character past it.
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62 Returns '\n' if scanned or 0 otherwise.
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63 +/
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64 dchar scanNewline(ref char* p)
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65 {
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66 switch (*p)
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67 {
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68 case '\r':
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69 if (p[1] == '\n')
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70 ++p;
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71 case '\n':
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72 ++p;
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73 return '\n';
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74 default:
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75 if (isUnicodeNewline(p))
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76 {
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77 p += 3;
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78 return '\n';
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79 }
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80 }
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81 return 0;
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82 }