html/053dilated_reagent.cc.html


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title>Mu - 053dilated_reagent.cc</title>
<meta name="Generator" content="Vim/7.4">
<meta name="plugin-version" content="vim7.4_v2">
<meta name="syntax" content="cpp">
<meta name="settings" content="use_css,pre_wrap,no_foldcolumn,expand_tabs,prevent_copy=">
<meta name="colorscheme" content="minimal">
<style type="text/css">
<!--
pre { white-space: pre-wrap; font-family: monospace; color: #eeeeee; background-color: #080808; }
body { font-size: 12pt; font-family: monospace; color: #eeeeee; background-color: #080808; }
* { font-size: 12pt; font-size: 1em; }
.Constant { color: #00a0a0; }
.Normal { color: #eeeeee; background-color: #080808; padding-bottom: 1px; }
.traceContains { color: #008000; }
.cSpecial { color: #008000; }
.Comment { color: #9090ff; }
.Delimiter { color: #800080; }
.Special { color: #c00000; }
.Identifier { color: #fcb165; }
.Error { color: #ffffff; background-color: #ff6060; padding-bottom: 1px; }
.PreProc { color: #800080; }
-->
</style>

<script type='text/javascript'>
<!--

-->
</script>
</head>
<body>
<pre id='vimCodeElement'>
<span class="Comment">//: An alternative syntax for reagents that permits whitespace in properties,</span>
<span class="Comment">//: grouped by brackets. We'll use this ability in the next layer, when we</span>
<span class="Comment">//: generalize types from lists to trees of properties.</span>

<span class="Delimiter">:(scenarios load)</span>
<span class="Delimiter">:(scenario dilated_reagent)</span>
def main [
  <span class="Delimiter">{</span><span class="Constant">1</span>: number<span class="Delimiter">,</span> foo: bar<span class="Delimiter">}</span><span class="Special"> &lt;- </span>copy <span class="Constant">34</span>
]
<span class="traceContains">+parse:   product: {1: &quot;number&quot;, &quot;foo&quot;: &quot;bar&quot;}</span>

<span class="Delimiter">:(scenario load_trailing_space_after_curly_bracket)</span>
def main [
<span class="PreProc">  </span><span class="Comment"># line below has a space at the end</span>
  <span class="Delimiter">{</span><span class="Error"> </span>
]
<span class="Comment"># successfully parsed</span>

<span class="Delimiter">:(scenarios run)</span>
<span class="Delimiter">:(scenario dilated_reagent_with_comment)</span>
def main [
  <span class="Delimiter">{</span><span class="Constant">1</span>: number<span class="Delimiter">,</span> foo: bar<span class="Delimiter">}</span><span class="Special"> &lt;- </span>copy <span class="Constant">34</span>  <span class="Comment"># test comment</span>
]
<span class="traceContains">+parse:   product: {1: &quot;number&quot;, &quot;foo&quot;: &quot;bar&quot;}</span>
$error: <span class="Constant">0</span>

<span class="Delimiter">:(scenario dilated_reagent_with_comment_immediately_following)</span>
def main [
  <span class="Constant">1</span>:number<span class="Special"> &lt;- </span>copy <span class="Delimiter">{</span><span class="Constant">34</span>: literal<span class="Delimiter">}</span>  <span class="Comment"># test comment</span>
]
$error: <span class="Constant">0</span>

<span class="Comment">//: First augment next_word to group balanced brackets together.</span>

<span class="Delimiter">:(before &quot;End next_word Special-cases&quot;)</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> == <span class="Constant">'('</span><span class="Delimiter">)</span>
  <span class="Identifier">return</span> slurp_balanced_bracket<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
<span class="Comment">// treat curlies mostly like parens, but don't mess up labels</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>start_of_dilated_reagent<span class="Delimiter">(</span>in<span class="Delimiter">))</span>
  <span class="Identifier">return</span> slurp_balanced_bracket<span class="Delimiter">(</span>in<span class="Delimiter">);</span>

<span class="Delimiter">:(code)</span>
<span class="Comment">// A curly is considered a label if it's the last thing on a line. Dilated</span>
<span class="Comment">// reagents should remain all on one line.</span>
<span class="Normal">bool</span> start_of_dilated_reagent<span class="Delimiter">(</span>istream&amp; in<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> != <span class="Constant">'{'</span><span class="Delimiter">)</span> <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
  <span class="Normal">int</span> pos = in<span class="Delimiter">.</span>tellg<span class="Delimiter">();</span>
  in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>  <span class="Comment">// slurp '{'</span>
  skip_whitespace_but_not_newline<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
  <span class="Normal">char</span> next = in<span class="Delimiter">.</span>peek<span class="Delimiter">();</span>
  in<span class="Delimiter">.</span>seekg<span class="Delimiter">(</span>pos<span class="Delimiter">);</span>
  <span class="Identifier">return</span> next != <span class="cSpecial">'\n'</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>

<span class="Comment">// Assume the first letter is an open bracket, and read everything until the</span>
<span class="Comment">// matching close bracket.</span>
<span class="Comment">// We balance {} () and []. And we skip one character after '\'.</span>
string slurp_balanced_bracket<span class="Delimiter">(</span>istream&amp; in<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  ostringstream result<span class="Delimiter">;</span>
  <span class="Normal">char</span> c<span class="Delimiter">;</span>
  list&lt;<span class="Normal">char</span>&gt; open_brackets<span class="Delimiter">;</span>
  <span class="Normal">while</span> <span class="Delimiter">(</span>in &gt;&gt; c<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="cSpecial">'\\'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
      <span class="Comment">// always silently skip the next character</span>
      result &lt;&lt; c<span class="Delimiter">;</span>
      <span class="Normal">if</span> <span class="Delimiter">(</span>!<span class="Delimiter">(</span>in &gt;&gt; c<span class="Delimiter">))</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
      result &lt;&lt; c<span class="Delimiter">;</span>
      <span class="Identifier">continue</span><span class="Delimiter">;</span>
    <span class="Delimiter">}</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="Constant">'('</span><span class="Delimiter">)</span> open_brackets<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>c<span class="Delimiter">);</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="Constant">')'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
      assert<span class="Delimiter">(</span>open_brackets<span class="Delimiter">.</span>back<span class="Delimiter">()</span> == <span class="Constant">'('</span><span class="Delimiter">);</span>
      open_brackets<span class="Delimiter">.</span>pop_back<span class="Delimiter">();</span>
    <span class="Delimiter">}</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="Constant">'['</span><span class="Delimiter">)</span> open_brackets<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>c<span class="Delimiter">);</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="Constant">']'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
      assert<span class="Delimiter">(</span>open_brackets<span class="Delimiter">.</span>back<span class="Delimiter">()</span> == <span class="Constant">'['</span><span class="Delimiter">);</span>
      open_brackets<span class="Delimiter">.</span>pop_back<span class="Delimiter">();</span>
    <span class="Delimiter">}</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="Constant">'{'</span><span class="Delimiter">)</span> open_brackets<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>c<span class="Delimiter">);</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>c == <span class="Constant">'}'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
      assert<span class="Delimiter">(</span>open_brackets<span class="Delimiter">.</span>back<span class="Delimiter">()</span> == <span class="Constant">'{'</span><span class="Delimiter">);</span>
      open_brackets<span class="Delimiter">.</span>pop_back<span class="Delimiter">();</span>
    <span class="Delimiter">}</span>
    result &lt;&lt; c<span class="Delimiter">;</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>open_brackets<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  skip_whitespace_and_comments_but_not_newline<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
  <span class="Identifier">return</span> result<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
<span class="Delimiter">}</span>

<span class="Delimiter">:(after &quot;Parsing reagent(string s)&quot;)</span>
<span class="Normal">if</span> <span class="Delimiter">(</span>s<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> == <span class="Constant">'{'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
  assert<span class="Delimiter">(</span>properties<span class="Delimiter">.</span>empty<span class="Delimiter">());</span>
  istringstream in<span class="Delimiter">(</span>s<span class="Delimiter">);</span>
  in &gt;&gt; std::noskipws<span class="Delimiter">;</span>
  in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>  <span class="Comment">// skip '{'</span>
  name = slurp_key<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>name<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Delimiter">{</span>
    raise &lt;&lt; <span class="Constant">&quot;invalid reagent &quot;</span> &lt;&lt; s &lt;&lt; <span class="Constant">&quot; without a name</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
    <span class="Identifier">return</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  <span class="Normal">if</span> <span class="Delimiter">(</span>name == <span class="Constant">&quot;}&quot;</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
    raise &lt;&lt; <span class="Constant">&quot;invalid empty reagent &quot;</span> &lt;&lt; s &lt;&lt; <span class="cSpecial">'\n'</span> &lt;&lt; end<span class="Delimiter">();</span>
    <span class="Identifier">return</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  <span class="Delimiter">{</span>
    string_tree* value = <span class="Normal">new</span> string_tree<span class="Delimiter">(</span>next_word<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
    <span class="Comment">// End Parsing Reagent Type Property(value)</span>
    type = new_type_tree<span class="Delimiter">(</span>value<span class="Delimiter">);</span>
    <span class="Normal">delete</span> value<span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  <span class="Normal">while</span> <span class="Delimiter">(</span>has_data<span class="Delimiter">(</span>in<span class="Delimiter">))</span> <span class="Delimiter">{</span>
    string key = slurp_key<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>key<span class="Delimiter">.</span>empty<span class="Delimiter">())</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
    <span class="Normal">if</span> <span class="Delimiter">(</span>key == <span class="Constant">&quot;}&quot;</span><span class="Delimiter">)</span> <span class="Identifier">continue</span><span class="Delimiter">;</span>
    string_tree* value = <span class="Normal">new</span> string_tree<span class="Delimiter">(</span>next_word<span class="Delimiter">(</span>in<span class="Delimiter">));</span>
    <span class="Comment">// End Parsing Reagent Property(value)</span>
    properties<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>pair&lt;string<span class="Delimiter">,</span> string_tree*&gt;<span class="Delimiter">(</span>key<span class="Delimiter">,</span> value<span class="Delimiter">));</span>
  <span class="Delimiter">}</span>
  <span class="Identifier">return</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>

<span class="Delimiter">:(code)</span>
string slurp_key<span class="Delimiter">(</span>istream&amp; in<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  string result = next_word<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
  <span class="Normal">while</span> <span class="Delimiter">(</span>!result<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> &amp;&amp; *result<span class="Delimiter">.</span>rbegin<span class="Delimiter">()</span> == <span class="Constant">':'</span><span class="Delimiter">)</span>
    strip_last<span class="Delimiter">(</span>result<span class="Delimiter">);</span>
  <span class="Normal">while</span> <span class="Delimiter">(</span>isspace<span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">())</span> || in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> == <span class="Constant">':'</span><span class="Delimiter">)</span>
    in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
<span class="Delimiter">}</span>
</pre>
</body>
</html>
<!-- vim: set foldmethod=manual : -->