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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Separating input into blocks</title>
<link rel="stylesheet" type="text/css" href="slides/slides.css"></head>
<body>
<h1>Separating input into blocks</h1>
<div class="slides">
<div class="page">
<div class="slide slide-header"><div class="slide-nr">1</div><div class="headers">
<h1>Separating input into blocks</h1>
</div></div>
<ul><li>
the input is treated as a sequence of blocks.
</li><li>
each block has a type, a value and optional notes.
</li><li>
blocks are separated by empty lines.
</li></ul>
</div>
<div class="page"><div class="slide"><div class="slide-nr">2</div>
<code>
<span class="macro">@Def(<span class="name">input prereqs</span>)</span><br/>
<span class="in1"></span><span class="macro">@put(<span class="name">globals</span>)</span><br/>
<span class="macro">@End(<span class="name">input prereqs</span>)</span><br/>
</code></div>
<ul><li>
this file uses a local shortcut for the global fragment
</li></ul>
</div>
<div class="page"><div class="slide"><div class="slide-nr">3</div>
<code>
<span class="macro">@def(<span class="name">globals</span>)</span><br/>
<span class="in1"></span><span class="type">enum</span> <span class="keyword">class</span> <span class="type">Read_State</span> {<br/>
<span class="in2"></span><span class="var">new_element</span><br/>
<span class="in2"></span><span class="macro">@put(<span class="name">read states</span>)</span><br/>
<span class="in1"></span>};<br/>
<span class="macro">@end(<span class="name">globals</span>)</span><br/>
</code></div>
<ul><li>
the <code><span class="type">Read_State</span></code> identifies the mode that the block parser is currently in
</li><li>
the default <code><span class="var">new_element</span></code> signals that a new block is starting
</li></ul>
</div>
<div class="page"><div class="slide"><div class="slide-nr">4</div>
<code>
<span class="macro">@add(<span class="name">globals</span>)</span><br/>
<span class="in1"></span><span class="keyword">using</span> <span class="type">RS</span> = <span class="type">Read_State</span>;<br/>
<span class="macro">@end(<span class="name">globals</span>)</span><br/>
</code></div>
<ul><li>
<code><span class="var">RS</span></code> is a shortcut for the <code><span class="type">Read_State</span></code>.
</li></ul>
</div>
<div class="page"><div class="slide"><div class="slide-nr">5</div>
<code>
<span class="macro">@Add(<span class="name">open input elements</span>)</span><br/>
<span class="in1"></span><span class="type">Read_State</span> <span class="var">state</span> = <span class="type">RS</span>::<span class="var">new_element</span>;<br/>
<span class="macro">@End(<span class="name">open input elements</span>)</span><br/>
</code></div>
<ul><li>
each input element has a <code><span class="type">Read_State</span></code>.
</li><li>
the initial value is <code><span class="var">new_element</span></code>.
</li></ul>
</div>
<div class="page"><div class="slide"><div class="slide-nr">6</div>
<code>
<span class="macro">@Def(<span class="name">process line</span>)</span><br/>
<span class="in1"></span><span class="keyword">do</span> {<br/>
<span class="in2"></span><span class="type">auto</span> &<span class="var">state</span> = <span class="var">inputs</span>.<span class="fn">cur</span>().<span class="var">state</span>;<br/>
<span class="in2"></span><span class="macro">@put(<span class="name">line vars</span>)</span>;<br/>
<span class="in2"></span><span class="macro">@put(<span class="name">states with newlines</span>)</span>;<br/>
<span class="in2"></span><span class="macro">@put(<span class="name">handle newlines</span>)</span>;<br/>
<span class="in2"></span><span class="macro">@put(<span class="name">states without newlines</span>)</span>;<br/>
<span class="in2"></span><span class="macro">@put(<span class="name">unknown line</span>)</span>;<br/>
<span class="in1"></span>} <span class="keyword">while</span> (<span class="num">false</span>);<br/>
<span class="macro">@End(<span class="name">process line</span>)</span><br/>
</code></div>
<ul><li>
the <code><span class="keyword">do</span></code>-loop is only a grouping construct
</li><li>
the loop will not iterate
</li><li>
but intermediate steps are allowed to <code><span class="keyword">break</span></code> out of the loop
</li></ul>
</div>
<div class="page"><div class="slide"><div class="slide-nr">7</div>
<code>
<span class="macro">@def(<span class="name">handle newlines</span>)</span><br/>
<span class="in1"></span><span class="keyword">if</span> (<span class="var">line</span>.<span class="fn">empty</span>()) {<br/>
<span class="in2"></span><span class="var">state</span> = <span class="var">RS</span>::<span class="var">new_element</span>;<br/>
<span class="in2"></span><span class="keyword">break</span>;<br/>
<span class="in1"></span>}<br/>
<span class="macro">@end(<span class="name">handle newlines</span>)</span><br/>
</code></div>
<ul><li>
if the line is empty, start a new element
</li></ul>
</div>
<div class="page"><div class="slide"><div class="slide-nr">8</div>
<code>
<span class="macro">@def(<span class="name">read states</span>)</span>,<br/>
<span class="in1"></span><span class="var">header</span><br/>
<span class="macro">@end(<span class="name">read states</span>)</span><br/>
</code></div>
<ul><li>
new state for parsing headers
</li></ul>
</div>
<div class="page"><div class="slide"><div class="slide-nr">9</div>
<code>
<span class="macro">@def(<span class="name">states without newlines</span>)</span><br/>
<span class="in1"></span><span class="keyword">if</span> (<span class="var">line</span>[<span class="num">0</span>] == <span class="str">'#'</span> && (<span class="var">state</span> == <span class="var">RS</span>::<span class="var">new_element</span> || <span class="var">state</span> == <span class="var">RS</span>::<span class="var">header</span>)) {<br/>
<span class="in2"></span><span class="type">bool</span> <span class="var">was_new</span> { <span class="var">state</span> == <span class="var">RS</span>::<span class="var">new_element</span> };<br/>
<span class="in2"></span><span class="var">state</span> = <span class="var">RS</span>::<span class="var">header</span>;<br/>
<span class="in2"></span><span class="macro">@put(<span class="name">got header line</span>)</span>;<br/>
<span class="in2"></span><span class="keyword">break</span>;<br/>
<span class="in1"></span>}<br/>
<span class="macro">@end(<span class="name">states without newlines</span>)</span><br/>
</code></div>
<ul><li>
headers start if the previous line is empty
</li><li>
and the current line starts with <code><span class="keyword">#</span></code>
</li></ul>
</div>
<div class="page"><div class="slide"><div class="slide-nr">10</div>
<code>
<span class="macro">@def(<span class="name">unknown line</span>)</span><br/>
<span class="in1"></span><span class="type">std</span>::<span class="var">cerr</span> << <span class="str">"!! "</span> << <span class="var">line</span> << <span class="str">'\n'</span>;<br/>
<span class="macro">@end(<span class="name">unknown line</span>)</span><br/>
</code></div>
<ul><li>
write error message for unrecognized line
</li></ul>
</div>
<div class="page"><div class="slide"><div class="slide-nr">11</div>
<code>
<span class="macro">@Add(<span class="name">includes</span>)</span><br/>
<span class="in1"></span><span class="keyword">#include</span> <<span class="type">vector</span>><br/>
<span class="macro">@End(<span class="name">includes</span>)</span><br/>
</code></div>
<ul><li>
<code><span class="type">Block</span></code> has <code><span class="type">std</span>::<span class="type">vector</span></code> of strings
</li></ul>
</div>
<div class="page"><div class="slide"><div class="slide-nr">12</div>
<code>
<span class="macro">@add(<span class="name">globals</span>)</span><br/>
<span class="in1"></span><span class="type">struct</span> <span class="type">Block</span> {<br/>
<span class="in2"></span><span class="type">Read_State</span> <span class="var">state</span>;<br/>
<span class="in2"></span><span class="type">std</span>::<span class="type">vector</span><<span class="type">std</span>::<span class="type">string</span>> <span class="var">value</span>;<br/>
<span class="in2"></span><span class="type">std</span>::<span class="type">vector</span><<span class="type">std</span>::<span class="type">string</span>> <span class="var">notes</span>;<br/>
<span class="in2"></span><span class="type">int</span> <span class="var">level</span>;<br/>
<span class="in1"></span>};<br/>
<span class="macro">@end(<span class="name">globals</span>)</span><br/>
</code></div>
<ul><li>
<code><span class="type">Block</span></code> contains values and notes
</li></ul>
</div>
<div class="page"><div class="slide"><div class="slide-nr">13</div>
<code>
<span class="macro">@Add(<span class="name">input elements</span>)</span><br/>
<span class="in1"></span><span class="type">std</span>::<span class="type">vector</span><<span class="type">Block</span>> <span class="var">blocks</span>;<br/>
<span class="macro">@End(<span class="name">input elements</span>)</span>;<br/>
</code></div>
<ul><li>
<code><span class="type">Input</span></code> contains container of <code><span class="type">Block</span></code>s
</li></ul>
</div>
<div class="page"><div class="slide"><div class="slide-nr">14</div>
<code>
<span class="macro">@def(<span class="name">line vars</span>)</span><br/>
<span class="in1"></span><span class="type">auto</span> &<span class="var">blocks</span> =<br/>
<span class="in2"></span><span class="var">inputs</span>.<span class="fn">cur_input</span>().<span class="var">blocks</span>;<br/>
<span class="macro">@end(<span class="name">line vars</span>)</span><br/>
</code></div>
<ul><li>
get reference to <code><span class="type">Block</span></code>s
</li></ul>
</div>
<div class="page"><div class="slide"><div class="slide-nr">15</div>
<code>
<span class="macro">@def(<span class="name">got header line</span>)</span><br/>
<span class="in1"></span><span class="type">auto</span> <span class="var">b</span> { <span class="var">line</span>.<span class="fn">begin</span>() };<br/>
<span class="in1"></span><span class="type">auto</span> <span class="var">e</span> { <span class="var">line</span>.<span class="fn">end</span>() };<br/>
<span class="in1"></span><span class="type">int</span> <span class="var">l</span> { <span class="num">0</span> };<br/>
<span class="in1"></span><span class="keyword">for</span> (; <span class="var">b</span> != <span class="var">e</span> && *<span class="var">b</span> == <span class="str">'#'</span>; ++<span class="var">b</span>, ++<span class="var">l</span>) {}<br/>
<span class="in1"></span><span class="keyword">for</span> (; <span class="var">b</span> != <span class="var">e</span> && *<span class="var">b</span> == <span class="str">' '</span>; ++<span class="var">b</span>) {}<br/>
<span class="in1"></span><span class="keyword">if</span> (<span class="var">was_new</span> || <span class="var">blocks</span>.<span class="fn">empty</span>() || <span class="var">blocks</span>.<span class="fn">back</span>().<span class="var">state</span> != <span class="var">RS</span>::<span class="var">header</span> ||<br/>
<span class="in2"></span><span class="var">blocks</span>.<span class="fn">back</span>().<span class="var">notes</span>.<span class="fn">size</span>()<br/>
<span class="in1"></span>) {<br/>
<span class="in2"></span><span class="var">blocks</span>.<span class="fn">push_back</span>({ <span class="var">RS</span>::<span class="var">header</span>, {}, {}, <span class="var">l</span> });<br/>
<span class="in1"></span>}<br/>
<span class="in1"></span><span class="var">blocks</span>.<span class="fn">back</span>().<span class="var">value</span>.<span class="fn">emplace_back</span>(<br/>
<span class="in2"></span><span class="var">b</span>, <span class="var">e</span><br/>
<span class="in1"></span>);<br/>
<span class="macro">@end(<span class="name">got header line</span>)</span><br/>
</code></div>
<ul><li>
count <code><span class="keyword">#</span></code>s
</li><li>
skip spaces
</li><li>
rest is header title
</li></ul>
</div>
<div class="page"><div class="slide"><div class="slide-nr">16</div>
<code>
<span class="macro">@add(<span class="name">read states</span>)</span>,<br/>
<span class="in1"></span><span class="var">code</span>,<br/>
<span class="in1"></span><span class="var">after_code</span><br/>
<span class="macro">@end(<span class="name">read states</span>)</span><br/>
</code></div>
<ul><li>
new states for parsing code blocks
</li></ul>
</div>
<div class="page"><div class="slide"><div class="slide-nr">17</div>
<code>
<span class="macro">@def(<span class="name">states with newlines</span>)</span><br/>
<span class="in1"></span><span class="keyword">if</span> (<span class="var">line</span>.<span class="fn">size</span>() >= <span class="num">3</span> && <span class="var">line</span>.<span class="fn">substr</span>(<span class="num">0</span>, <span class="num">3</span>) == <span class="str">"```"</span> &&<br/>
<span class="in2"></span><span class="var">state</span> == <span class="var">RS</span>::<span class="var">new_element</span><br/>
<span class="in1"></span>) {<br/>
<span class="in2"></span><span class="var">state</span> = <span class="var">RS</span>::<span class="var">code</span>;<br/>
<span class="in2"></span><span class="macro">@put(<span class="name">enter code block</span>)</span>;<br/>
<span class="in2"></span><span class="keyword">break</span>;<br/>
<span class="in1"></span>}<br/>
<span class="macro">@end(<span class="name">states with newlines</span>)</span><br/>
</code></div>
<ul><li>
recognize start of code block
</li></ul>
</div>
<div class="page"><div class="slide"><div class="slide-nr">18</div>
<code>
<span class="macro">@add(<span class="name">states with newlines</span>)</span><br/>
<span class="in1"></span><span class="keyword">if</span> (<span class="var">state</span> == <span class="var">RS</span>::<span class="var">code</span>) {<br/>
<span class="in2"></span><span class="keyword">if</span> (<span class="var">line</span> == <span class="str">"```"</span>) {<br/>
<span class="in3"></span><span class="var">state</span> = <span class="var">RS</span>::<span class="var">after_code</span>;<br/>
<span class="in2"></span>} <span class="keyword">else</span> {<br/>
<span class="in3"></span><span class="macro">@put(<span class="name">got code line</span>)</span>;<br/>
<span class="in2"></span>}<br/>
<span class="in2"></span><span class="keyword">break</span>;<br/>
<span class="in1"></span>}<br/>
<span class="macro">@end(<span class="name">states with newlines</span>)</span><br/>
</code></div>
<ul><li>
when in code block, distinguish between ending of code block
</li><li>
and the processing of a code line
</li></ul>
</div>
<div class="page"><div class="slide"><div class="slide-nr">19</div>
<code>
<span class="macro">@def(<span class="name">enter code block</span>)</span><br/>
<span class="in1"></span><span class="var">blocks</span>.<span class="fn">push_back</span>({ <span class="var">RS</span>::<span class="var">code</span>, {}, {}, <span class="num">0</span> });<br/>
<span class="macro">@end(<span class="name">enter code block</span>)</span><br/>
</code></div>
<ul><li>
add a new code block
</li></ul>
</div>
<div class="page"><div class="slide"><div class="slide-nr">20</div>
<code>
<span class="macro">@def(<span class="name">got code line</span>)</span><br/>
<span class="in1"></span><span class="var">blocks</span>.<span class="fn">back</span>().<span class="var">value</span>.<span class="fn">push_back</span>(<span class="var">line</span>);<br/>
<span class="macro">@end(<span class="name">got code line</span>)</span><br/>
</code></div>
<ul><li>
add the code line
</li></ul>
</div>
<div class="page"><div class="slide"><div class="slide-nr">21</div>
<code>
<span class="macro">@add(<span class="name">read states</span>)</span>,<br/>
<span class="in1"></span><span class="var">notes</span><br/>
<span class="macro">@end(<span class="name">read states</span>)</span><br/>
</code></div>
<ul><li>
special state for handling states
</li></ul>
</div>
<div class="page"><div class="slide"><div class="slide-nr">22</div>
<code>
<span class="macro">@add(<span class="name">states without newlines</span>)</span><br/>
<span class="in1"></span><span class="keyword">if</span> (<span class="var">line</span>[<span class="num">0</span>] == <span class="str">'*'</span>) {<br/>
<span class="in2"></span><span class="keyword">if</span> (<br/>
<span class="in3"></span><span class="var">state</span> == <span class="var">RS</span>::<span class="var">header</span> ||<br/>
<span class="in3"></span><span class="var">state</span> == <span class="var">RS</span>::<span class="var">after_code</span> ||<br/>
<span class="in3"></span><span class="var">state</span> == <span class="var">RS</span>::<span class="var">notes</span><br/>
<span class="in3"></span><span class="macro">@put(<span class="name">can have notes</span>)</span><br/>
<span class="in2"></span>) {<br/>
<span class="in3"></span><span class="var">state</span> = <span class="var">RS</span>::<span class="var">notes</span>;<br/>
<span class="in3"></span><span class="macro">@put(<span class="name">got note</span>)</span>;<br/>
<span class="in3"></span><span class="keyword">break</span>;<br/>
<span class="in2"></span>}<br/>
<span class="in1"></span>}<br/>
<span class="macro">@end(<span class="name">states without newlines</span>)</span><br/>
</code></div>
<ul><li>
a note starts with a line that has a <code>*</code> as its first character
</li><li>
the line must directly follow a header, a code section or be part of a note section
</li></ul>
</div>
<div class="page"><div class="slide"><div class="slide-nr">23</div>
<code>
<span class="macro">@add(<span class="name">states without newlines</span>)</span><br/>
<span class="in1"></span><span class="keyword">if</span> (<span class="var">line</span>[<span class="num">0</span>] == <span class="str">' '</span> && <span class="var">state</span> == <span class="var">RS</span>::<span class="var">notes</span>) {<br/>
<span class="in2"></span><span class="macro">@put(<span class="name">add note</span>)</span>;<br/>
<span class="in2"></span><span class="keyword">break</span>;<br/>
<span class="in1"></span>}<br/>
<span class="macro">@end(<span class="name">states without newlines</span>)</span><br/>
</code></div>
<ul><li>
longer notes can be continued over multiple lines
</li><li>
the additional lines need to start with a space
</li></ul>
</div>
<div class="page"><div class="slide"><div class="slide-nr">24</div>
<code>
<span class="macro">@def(<span class="name">got note</span>)</span><br/>
<span class="in1"></span><span class="type">auto</span> <span class="var">b</span> { <span class="var">line</span>.<span class="fn">begin</span>() };<br/>
<span class="in1"></span><span class="type">auto</span> <span class="var">e</span> { <span class="var">line</span>.<span class="fn">end</span>() };<br/>
<span class="in1"></span><span class="keyword">for</span> (; <span class="var">b</span> != <span class="var">e</span> && (*<span class="var">b</span> == <span class="str">'*'</span> || *<span class="var">b</span> == <span class="str">' '</span>); ++<span class="var">b</span>) {}<br/>
<span class="in1"></span><span class="var">blocks</span>.<span class="fn">back</span>().<span class="var">notes</span>.<span class="fn">emplace_back</span>(<span class="var">b</span>, <span class="var">e</span>);<br/>
<span class="macro">@end(<span class="name">got note</span>)</span><br/>
</code></div>
<ul><li>
to process a note all <code>*</code>s and spaces at the beginning of the line are ignored
</li><li>
the rest is added as a note
</li></ul>
</div>
<div class="page"><div class="slide"><div class="slide-nr">25</div>
<code>
<span class="macro">@def(<span class="name">add note</span>)</span><br/>
<span class="in1"></span><span class="var">blocks</span>.<span class="fn">back</span>().<span class="var">notes</span>.<span class="fn">back</span>() += <span class="var">line</span>;<br/>
<span class="macro">@end(<span class="name">add note</span>)</span><br/>
</code></div>
<ul><li>
if a note is continued over multiple lines, the additional lines are added to the last note
</li></ul>
</div>
<div class="page"><div class="slide"><div class="slide-nr">26</div>
<code>
<span class="macro">@add(<span class="name">read states</span>)</span>,<br/>
<span class="in1"></span><span class="var">para</span><br/>
<span class="macro">@end(<span class="name">read states</span>)</span><br/>
</code></div>
<ul><li>
special state for non-slide paragraphs
</li><li>
these can be used to describe functionality outside of simple slides
</li></ul>
</div>
<div class="page"><div class="slide"><div class="slide-nr">27</div>
<code>
<span class="macro">@add(<span class="name">states without newlines</span>)</span><br/>
<span class="in1"></span><span class="macro">@put(<span class="name">pre default states</span>)</span>;<br/>
<span class="in1"></span><span class="keyword">if</span> (<span class="var">line</span>[<span class="num">0</span>] != <span class="str">' '</span>) {<br/>
<span class="in2"></span><span class="keyword">if</span> (<span class="var">state</span> == <span class="var">RS</span>::<span class="var">new_element</span> || <span class="var">state</span> == <span class="var">RS</span>::<span class="var">para</span>) {<br/>
<span class="in3"></span><span class="macro">@put(<span class="name">create para</span>)</span>;<br/>
<span class="in3"></span><span class="macro">@put(<span class="name">add para</span>)</span>;<br/>
<span class="in3"></span><span class="var">state</span> = <span class="var">RS</span>::<span class="var">para</span>;<br/>
<span class="in3"></span><span class="keyword">break</span>;<br/>
<span class="in2"></span>}<br/>
<span class="in1"></span>}<br/>
<span class="macro">@end(<span class="name">states without newlines</span>)</span><br/>
</code></div>
<ul><li>
paragraphs are any other line that does not start with a space
</li></ul>
</div>
<div class="page"><div class="slide"><div class="slide-nr">28</div>
<code>
<span class="macro">@def(<span class="name">create para</span>)</span><br/>
<span class="in1"></span><span class="keyword">if</span> (<span class="var">state</span> == <span class="var">RS</span>::<span class="var">new_element</span>) {<br/>
<span class="in2"></span><span class="macro">@put(<span class="name">create para block</span>)</span>;<br/>
<span class="in2"></span><span class="var">blocks</span>.<span class="fn">back</span>().<span class="var">value</span>.<span class="fn">push_back</span>(<span class="var">line</span>);<br/>
<span class="in1"></span>}<br/>
<span class="macro">@end(<span class="name">create para</span>)</span><br/>
</code></div>
<ul><li>
needs to add a new block, if the last block is no paragraph block
</li><li>
then add the line to the last block
</li></ul>
</div>
<div class="page"><div class="slide"><div class="slide-nr">29</div>
<code>
<span class="macro">@def(<span class="name">create para block</span>)</span><br/>
<span class="in1"></span><span class="keyword">if</span> (<span class="var">blocks</span>.<span class="fn">empty</span>() || <span class="var">blocks</span>.<span class="fn">back</span>().<span class="var">state</span> != <span class="var">RS</span>::<span class="var">para</span>) {<br/>
<span class="in2"></span><span class="var">blocks</span>.<span class="fn">push_back</span>({ <span class="var">RS</span>::<span class="var">para</span>, {}, {}, <span class="num">0</span> });<br/>
<span class="in1"></span>}<br/>
<span class="macro">@end(<span class="name">create para block</span>)</span><br/>
</code></div>
<ul><li>
if the last block is not a paragraph, then add one
</li></ul>
</div>
<div class="page"><div class="slide"><div class="slide-nr">30</div>
<code>
<span class="macro">@def(<span class="name">add para</span>)</span><br/>
<span class="in1"></span><span class="keyword">if</span> (<span class="var">state</span> == <span class="var">RS</span>::<span class="var">para</span>) {<br/>
<span class="in2"></span><span class="var">blocks</span>.<span class="fn">back</span>().<span class="var">value</span>.<span class="fn">back</span>() += <span class="str">" "</span> + <span class="var">line</span>;<br/>
<span class="in1"></span>}<br/>
<br/>
<span class="macro">@end(<span class="name">add para</span>)</span><br/>
</code></div>
<ul><li>
if the current paragraph is extended, the line will be added to the last paragraph of the last block
</li></ul>
</div>
<div class="page"><div class="slide"><div class="slide-nr">31</div>
<code>
<span class="macro">@add(<span class="name">read states</span>)</span>,<br/>
<span class="in1"></span><span class="var">img</span><br/>
<span class="macro">@end(<span class="name">read states</span>)</span><br/>
</code></div>
<ul><li>
special state for image slides
</li></ul>
</div>
<div class="page"><div class="slide"><div class="slide-nr">32</div>
<code>
<span class="macro">@def(<span class="name">can have notes</span>)</span> ||<br/>
<span class="in1"></span><span class="var">state</span> == <span class="var">RS</span>::<span class="var">img</span><br/>
<span class="macro">@end(<span class="name">can have notes</span>)</span><br/>
</code></div>
<ul></ul>
</div>
<div class="page"><div class="slide"><div class="slide-nr">33</div>
<code>
<span class="macro">@def(<span class="name">pre default states</span>)</span><br/>
<span class="in1"></span><span class="keyword">if</span> (<span class="var">line</span>[<span class="num">0</span>] == <span class="str">'!'</span>) {<br/>
<span class="in2"></span><span class="keyword">if</span> (<span class="var">state</span> == <span class="var">RS</span>::<span class="var">new_element</span> || <span class="var">state</span> == <span class="var">RS</span>::<span class="var">img</span>) {<br/>
<span class="in3"></span><span class="macro">@put(<span class="name">create img</span>)</span>;<br/>
<span class="in3"></span><span class="macro">@put(<span class="name">add img</span>)</span>;<br/>
<span class="in3"></span><span class="var">state</span> = <span class="var">RS</span>::<span class="var">img</span>;<br/>
<span class="in3"></span><span class="keyword">break</span>;<br/>
<span class="in2"></span>}<br/>
<span class="in1"></span>}<br/>
<span class="macro">@end(<span class="name">pre default states</span>)</span><br/>
</code></div>
<ul></ul>
</div>
<div class="page"><div class="slide"><div class="slide-nr">34</div>
<code>
<span class="macro">@def(<span class="name">create img</span>)</span><br/>
<span class="in1"></span><span class="keyword">if</span> (<span class="var">state</span> == <span class="var">RS</span>::<span class="var">new_element</span>) {<br/>
<span class="in2"></span><span class="macro">@put(<span class="name">create img block</span>)</span>;<br/>
<span class="in1"></span>}<br/>
<span class="macro">@end(<span class="name">create img</span>)</span><br/>
</code></div>
<ul></ul>
</div>
<div class="page"><div class="slide"><div class="slide-nr">35</div>
<code>
<span class="macro">@def(<span class="name">create img block</span>)</span><br/>
<span class="in1"></span><span class="keyword">if</span> (<span class="var">blocks</span>.<span class="fn">empty</span>() || <span class="var">blocks</span>.<span class="fn">back</span>().<span class="var">state</span> != <span class="var">RS</span>::<span class="var">img</span> ||<br/>
<span class="in2"></span><span class="var">blocks</span>.<span class="fn">back</span>().<span class="var">notes</span>.<span class="fn">size</span>()<br/>
<span class="in1"></span>) {<br/>
<span class="in2"></span><span class="var">blocks</span>.<span class="fn">push_back</span>({ <span class="var">RS</span>::<span class="var">img</span>, {}, {}, <span class="num">0</span> });<br/>
<span class="in1"></span>}<br/>
<span class="macro">@end(<span class="name">create img block</span>)</span><br/>
</code></div>
<ul></ul>
</div>
<div class="page"><div class="slide"><div class="slide-nr">36</div>
<code>
<span class="macro">@def(<span class="name">add img</span>)</span><br/>
<span class="in1"></span><span class="keyword">if</span> (<span class="var">line</span>.<span class="fn">size</span>() < <span class="num">3</span> || <span class="var">line</span>[<span class="num">1</span>] != <span class="str">'('</span> || <span class="var">line</span>[<span class="var">line</span>.<span class="fn">size</span>() - <span class="num">1</span>] != <span class="str">')'</span>) {<br/>
<span class="in2"></span><span class="type">std</span>::<span class="var">cerr</span> << <span class="str">"wrong line "</span> << <span class="var">line</span> << <span class="str">"\n"</span>;<br/>
<span class="in1"></span>}<br/>
<span class="in1"></span><span class="var">blocks</span>.<span class="fn">back</span>().<span class="var">value</span>.<span class="fn">push_back</span>(<span class="var">line</span>.<span class="fn">substr</span>(<span class="num">2</span>, <span class="var">line</span>.<span class="fn">size</span>() - <span class="num">3</span>));<br/>
<span class="macro">@end(<span class="name">add img</span>)</span><br/>
</code></div>
<ul></ul>
</div>
</body>
</html>