SE250:lab-9:rwan064:scanner.h
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<a name="line1"> 1</a> <font color="#444444">/* <a name="line2"> 2</a> File: scanner.h <a name="line3"> 3</a> Purpose: Header for Code that takes an input stream of characters and seperates it into operators, identifiers and seperators. <a name="line4"> 4</a> Author: Rajitha Wannigama <a name="line5"> 5</a> */</font> <a name="line6"> 6</a> <a name="line7"> 7</a> <font color="0000ff"><strong>#define PRINT_DEBUG printf( <font color="#008000">"DEBUGGING at Line %d<font color="#77dd77">\n</font>"</font>, __LINE__ );</strong></font> <a name="line8"> 8</a> <a name="line9"> 9</a> <strong>extern</strong> <strong>const</strong> <strong>int</strong> <font color="#2040a0">CPFILE_OP</font><font color="4444FF">;</font> <a name="line10">10</a> <strong>extern</strong> <strong>const</strong> <strong>int</strong> <font color="#2040a0">CPFILE_EOF</font><font color="4444FF">;</font> <a name="line11">11</a> <strong>extern</strong> <strong>const</strong> <strong>int</strong> <font color="#2040a0">CPFILE_NL</font><font color="4444FF">;</font> <a name="line12">12</a> <strong>extern</strong> <strong>const</strong> <strong>int</strong> <font color="#2040a0">CPFILE_SP</font><font color="4444FF">;</font> <a name="line13">13</a> <strong>extern</strong> <strong>const</strong> <strong>int</strong> <font color="#2040a0">CPFILE_TAB</font><font color="4444FF">;</font> <a name="line14">14</a> <strong>extern</strong> <strong>const</strong> <strong>int</strong> <font color="#2040a0">CPFILE_UN</font><font color="4444FF">;</font> <a name="line15">15</a> <a name="line16">16</a> <font color="#444444">/* <a name="line17">17</a> Returns true if the character passed as a paramter is a C operator, false otherwise. <a name="line18">18</a> */</font> <a name="line19">19</a> <font color="#2040a0">bool</font> <font color="#2040a0">is_operator</font><font color="4444FF">(</font> <strong>char</strong> <font color="#2040a0">c</font> <font color="4444FF">)</font><font color="4444FF">;</font> <a name="line20">20</a> <a name="line21">21</a> <font color="#444444">/* <a name="line22">22</a> Seperators are SPACE's, TAB's, NEWLINE's or EOF's. <a name="line23">23</a> */</font> <a name="line24">24</a> <font color="#2040a0">bool</font> <font color="#2040a0">is_seperator</font><font color="4444FF">(</font> <strong>char</strong> <font color="#2040a0">c</font> <font color="4444FF">)</font><font color="4444FF">;</font> <a name="line25">25</a> <a name="line26">26</a> <font color="#444444">/* <a name="line27">27</a> Read till a space, new line, an operator or EOF is reached. <a name="line28">28</a> If an operator is read as the first character then that <a name="line29">29</a> operator is returned and function exits. Otherwise the <a name="line30">30</a> whole word is returned till another operator is found. <a name="line31">31</a> */</font> <a name="line32">32</a> <strong>int</strong> <font color="#2040a0">read_word</font><font color="4444FF">(</font> <font color="#2040a0">FILE</font> <font color="4444FF">*</font><font color="#2040a0">fp</font>, <strong>char</strong> <font color="4444FF">*</font><font color="#2040a0">str</font> <font color="4444FF">)</font><font color="4444FF">;</font> <a name="line33">33</a> <a name="line34">34</a> <font color="#444444">/* <a name="line35">35</a> Returns true if str is a keyword of C, false otherwise. <a name="line36">36</a> */</font> <a name="line37">37</a> <font color="#2040a0">bool</font> <font color="#2040a0">is_keyword</font><font color="4444FF">(</font> <strong>char</strong> <font color="4444FF">*</font><font color="#2040a0">str</font> <font color="4444FF">)</font><font color="4444FF">;</font> <a name="line38">38</a> <a name="line39">39</a> <font color="#2040a0">String</font><font color="4444FF">*</font> <font color="#2040a0">scan</font><font color="4444FF">(</font> <font color="#2040a0">FILE</font> <font color="4444FF">*</font><font color="#2040a0">fpIn</font>, <font color="#2040a0">FILE</font> <font color="4444FF">*</font><font color="#2040a0">fpOut</font> <font color="4444FF">)</font><font color="4444FF">;</font>
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