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996
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1 /*
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2 * BDSM2
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3 * Author: Adam Sawicki
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4 * http://www.regedit.risp.pl
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5 * mailto:regedit@risp.pl
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6 */
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7 #ifndef SOURCE_H_
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8 #define SOURCE_H_
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9
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10 class Source
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11 {
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12 public:
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13 struct Iterator
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14 {
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15 size_t Index;
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16 int Row;
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17 int Col;
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18
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19 // return string in form of "index: #, row: #, col: #"
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20 string ToString() const;
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21 };
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22
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23 private:
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24 const string *m_Src;
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25 Iterator m_Index;
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26 // Valid only if m_ErrIndexSaved
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27 Iterator m_ErrIndex;
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28 bool m_ErrIndexSaved;
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29
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30 // Read current character
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31 // Cannot be end.
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32 char Peek()
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33 {
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34 return (*m_Src)[m_Index.Index];
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35 }
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36 // Forward cursor one step
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37 // Cannot be end.
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38 void Forward();
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39 // Read current character and step forward
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40 // Cannot be end.
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41 char Get();
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42
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43 public:
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44 // Create view of given document as source for parsing
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45 Source(const string *Src);
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46
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47 const Iterator & GetIterator()
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48 {
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49 return (m_ErrIndexSaved ? m_ErrIndex : m_Index);
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50 }
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51
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52 // Return true of current position at the end
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53 bool End()
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54 {
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55 return m_Index.Index >= m_Src->size();
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56 }
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57 // Read current character and step forward (safe)
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58 // If at end, error.
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59 char GetS();
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60 // Skip all whitespaces and comments
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61 void Skip();
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62 // Freeze position for error reporting (real position will still moving)
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63 void SaveErrPos() {
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64 m_ErrIndex = m_Index;
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65 m_ErrIndexSaved = true;
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66 }
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67 // Drop frozen position for error (real position will be reported in errors)
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68 void DropErrPos() {
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69 m_ErrIndexSaved = false;
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70 }
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71 // Write error and terminate process, include current (or frozen) index, row and col
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72 void SrcError(const string &msg, ERR_PLACE place = ERR_GENERAL);
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73 };
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74
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75 #endif
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