about summary refs log tree commit diff stats
path: root/html/013literal_string.cc.html
blob: 56fff30cee3628cf5da9ac8962f0407e64a5b0e6 (plain) (blame)
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
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
<!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 - 013literal_string.cc</title>
<meta name="Generator" content="Vim/7.4">
<meta name="plugin-version" content="vim7.4_v1">
<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-family: monospace; color: #eeeeee; background-color: #080808; }
* { font-size: 1.05em; }
.cSpecial { color: #008000; }
.Comment { color: #9090ff; }
.Delimiter { color: #a04060; }
.Special { color: #ff6060; }
.Identifier { color: #804000; }
.Constant { color: #00a0a0; }
.traceContains { color: #008000; }
-->
</style>

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

-->
</script>
</head>
<body>
<pre id='vimCodeElement'>
<span class="Comment">//: For convenience, some instructions will take literal arrays of characters (strings).</span>
<span class="Comment">//:</span>
<span class="Comment">//: Instead of quotes, we'll use [] to delimit strings. That'll reduce the</span>
<span class="Comment">//: need for escaping since we can support nested brackets. And we can also</span>
<span class="Comment">//: imagine that 'recipe' might one day itself be defined in mu, doing its own</span>
<span class="Comment">//: parsing.</span>

<span class="Delimiter">:(scenarios load)</span>
<span class="Delimiter">:(scenario string_literal)</span>
recipe main [
  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>copy [abc def]  <span class="Comment"># copy can't really take a string</span>
]
<span class="traceContains">+parse:   ingredient: {name: &quot;abc def&quot;, properties: [_: &quot;literal-string&quot;]}</span>

<span class="Delimiter">:(scenario string_literal_with_colons)</span>
recipe main [
  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>copy [abc:def/ghi]
]
<span class="traceContains">+parse:   ingredient: {name: &quot;abc:def/ghi&quot;, properties: [_: &quot;literal-string&quot;]}</span>

<span class="Delimiter">:(before &quot;End Mu Types Initialization&quot;)</span>
Type_ordinal[<span class="Constant">&quot;literal-string&quot;</span>] = <span class="Constant">0</span><span class="Delimiter">;</span>

<span class="Delimiter">:(after &quot;string next_word(istream&amp; in)&quot;)</span>
  if <span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> == <span class="Constant">'['</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
    string result = slurp_quoted<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
    skip_whitespace<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
    skip_comment<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
    <span class="Identifier">return</span> result<span class="Delimiter">;</span>
  <span class="Delimiter">}</span>

<span class="Delimiter">:(code)</span>
string slurp_quoted<span class="Delimiter">(</span>istream&amp; in<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  ostringstream out<span class="Delimiter">;</span>
  assert<span class="Delimiter">(</span>!in<span class="Delimiter">.</span>eof<span class="Delimiter">());</span>  assert<span class="Delimiter">(</span>in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> == <span class="Constant">'['</span><span class="Delimiter">);</span>  out &lt;&lt; static_cast&lt;char&gt;<span class="Delimiter">(</span>in<span class="Delimiter">.</span>get<span class="Delimiter">());</span>  <span class="Comment">// slurp the '['</span>
  if <span class="Delimiter">(</span>code_string<span class="Delimiter">(</span>in<span class="Delimiter">,</span> out<span class="Delimiter">))</span>
    slurp_quoted_comment_aware<span class="Delimiter">(</span>in<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
  else
    slurp_quoted_comment_oblivious<span class="Delimiter">(</span>in<span class="Delimiter">,</span> out<span class="Delimiter">);</span>
  <span class="Identifier">return</span> out<span class="Delimiter">.</span>str<span class="Delimiter">();</span>
<span class="Delimiter">}</span>

<span class="Comment">// A string is a code string if it contains a newline before any non-whitespace</span>
<span class="Comment">// todo: support comments before the newline. But that gets messy.</span>
bool code_string<span class="Delimiter">(</span>istream&amp; in<span class="Delimiter">,</span> ostringstream&amp; out<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  while <span class="Delimiter">(</span>!in<span class="Delimiter">.</span>eof<span class="Delimiter">())</span> <span class="Delimiter">{</span>
    char c = in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
    if <span class="Delimiter">(</span>!isspace<span class="Delimiter">(</span>c<span class="Delimiter">))</span> <span class="Delimiter">{</span>
      in<span class="Delimiter">.</span>putback<span class="Delimiter">(</span>c<span class="Delimiter">);</span>
      <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
    <span class="Delimiter">}</span>
    out &lt;&lt; c<span class="Delimiter">;</span>
    if <span class="Delimiter">(</span>c == <span class="cSpecial">'\n'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
      <span class="Identifier">return</span> <span class="Constant">true</span><span class="Delimiter">;</span>
    <span class="Delimiter">}</span>
  <span class="Delimiter">}</span>
  <span class="Identifier">return</span> <span class="Constant">false</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>

<span class="Comment">// Read a regular string. Regular strings can only contain other regular</span>
<span class="Comment">// strings.</span>
void slurp_quoted_comment_oblivious<span class="Delimiter">(</span>istream&amp; in<span class="Delimiter">,</span> ostringstream&amp; out<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  int brace_depth = <span class="Constant">1</span><span class="Delimiter">;</span>
  while <span class="Delimiter">(</span>!in<span class="Delimiter">.</span>eof<span class="Delimiter">())</span> <span class="Delimiter">{</span>
    char c = in<span class="Delimiter">.</span>get<span class="Delimiter">();</span>
    if <span class="Delimiter">(</span>c == <span class="cSpecial">'\\'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
      out &lt;&lt; static_cast&lt;char&gt;<span class="Delimiter">(</span>in<span class="Delimiter">.</span>get<span class="Delimiter">());</span>
      <span class="Identifier">continue</span><span class="Delimiter">;</span>
    <span class="Delimiter">}</span>
    out &lt;&lt; c<span class="Delimiter">;</span>
    if <span class="Delimiter">(</span>c == <span class="Constant">'['</span><span class="Delimiter">)</span> ++brace_depth<span class="Delimiter">;</span>
    if <span class="Delimiter">(</span>c == <span class="Constant">']'</span><span class="Delimiter">)</span> --brace_depth<span class="Delimiter">;</span>
    if <span class="Delimiter">(</span>brace_depth == <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Identifier">break</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  if <span class="Delimiter">(</span>in<span class="Delimiter">.</span>eof<span class="Delimiter">()</span> &amp;&amp; brace_depth &gt; <span class="Constant">0</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
    raise &lt;&lt; <span class="Constant">&quot;unbalanced '['</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
    out<span class="Delimiter">.</span>clear<span class="Delimiter">();</span>
  <span class="Delimiter">}</span>
<span class="Delimiter">}</span>

<span class="Comment">// Read a code string. Code strings can contain either code or regular strings.</span>
void slurp_quoted_comment_aware<span class="Delimiter">(</span>istream&amp; in<span class="Delimiter">,</span> ostringstream&amp; out<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  char c<span class="Delimiter">;</span>
  while <span class="Delimiter">(</span>in &gt;&gt; c<span class="Delimiter">)</span> <span class="Delimiter">{</span>
    if <span class="Delimiter">(</span>c == <span class="cSpecial">'\\'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
      out &lt;&lt; static_cast&lt;char&gt;<span class="Delimiter">(</span>in<span class="Delimiter">.</span>get<span class="Delimiter">());</span>
      <span class="Identifier">continue</span><span class="Delimiter">;</span>
    <span class="Delimiter">}</span>
    if <span class="Delimiter">(</span>c == <span class="Constant">'#'</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
      out &lt;&lt; c<span class="Delimiter">;</span>
      while <span class="Delimiter">(</span>!in<span class="Delimiter">.</span>eof<span class="Delimiter">()</span> &amp;&amp; in<span class="Delimiter">.</span>peek<span class="Delimiter">()</span> != <span class="cSpecial">'\n'</span><span class="Delimiter">)</span> out &lt;&lt; static_cast&lt;char&gt;<span class="Delimiter">(</span>in<span class="Delimiter">.</span>get<span class="Delimiter">());</span>
      <span class="Identifier">continue</span><span class="Delimiter">;</span>
    <span class="Delimiter">}</span>
    if <span class="Delimiter">(</span>c == <span class="Constant">'['</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
      in<span class="Delimiter">.</span>putback<span class="Delimiter">(</span>c<span class="Delimiter">);</span>
      <span class="Comment">// recurse</span>
      out &lt;&lt; slurp_quoted<span class="Delimiter">(</span>in<span class="Delimiter">);</span>
      <span class="Identifier">continue</span><span class="Delimiter">;</span>
    <span class="Delimiter">}</span>
    out &lt;&lt; c<span class="Delimiter">;</span>
    if <span class="Delimiter">(</span>c == <span class="Constant">']'</span><span class="Delimiter">)</span> <span class="Identifier">return</span><span class="Delimiter">;</span>
  <span class="Delimiter">}</span>
  raise &lt;&lt; <span class="Constant">&quot;unbalanced '['</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span> &lt;&lt; end<span class="Delimiter">();</span>
  out<span class="Delimiter">.</span>clear<span class="Delimiter">();</span>
<span class="Delimiter">}</span>

<span class="Delimiter">:(after &quot;Parsing reagent(string s)&quot;)</span>
if <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>*s<span class="Delimiter">.</span>rbegin<span class="Delimiter">()</span> == <span class="Constant">']'</span><span class="Delimiter">);</span>
  <span class="Comment">// delete [] delimiters</span>
  s<span class="Delimiter">.</span>erase<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">,</span> <span class="Constant">1</span><span class="Delimiter">);</span>
  s<span class="Delimiter">.</span>erase<span class="Delimiter">(</span>SIZE<span class="Delimiter">(</span>s<span class="Delimiter">)</span>-<span class="Constant">1</span><span class="Delimiter">);</span>
  name = s<span class="Delimiter">;</span>
  types<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">);</span>
  properties<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>pair&lt;string<span class="Delimiter">,</span> vector&lt;string&gt; &gt;<span class="Delimiter">(</span>name<span class="Delimiter">,</span> vector&lt;string&gt;<span class="Delimiter">()));</span>
  properties<span class="Delimiter">.</span>back<span class="Delimiter">().</span>second<span class="Delimiter">.</span>push_back<span class="Delimiter">(</span><span class="Constant">&quot;literal-string&quot;</span><span class="Delimiter">);</span>
  <span class="Identifier">return</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>

<span class="Comment">//: Two tweaks to printing literal strings compared to other reagents:</span>
<span class="Comment">//:   a) Don't print the string twice in the representation, just put '_' in</span>
<span class="Comment">//:   the property list.</span>
<span class="Comment">//:   b) Escape newlines in the string to make it more friendly to trace().</span>

<span class="Delimiter">:(after &quot;string reagent::to_string()&quot;)</span>
  if <span class="Delimiter">(</span>is_literal_string<span class="Delimiter">(</span>*this<span class="Delimiter">))</span>
    <span class="Identifier">return</span> emit_literal_string<span class="Delimiter">(</span>name<span class="Delimiter">);</span>

<span class="Delimiter">:(code)</span>
bool is_literal_string<span class="Delimiter">(</span>const reagent&amp; x<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  <span class="Identifier">return</span> !x<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>second<span class="Delimiter">.</span>empty<span class="Delimiter">()</span> &amp;&amp; x<span class="Delimiter">.</span>properties<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">).</span>second<span class="Delimiter">.</span>at<span class="Delimiter">(</span><span class="Constant">0</span><span class="Delimiter">)</span> == <span class="Constant">&quot;literal-string&quot;</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>

string emit_literal_string<span class="Delimiter">(</span>string name<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  size_t pos = <span class="Constant">0</span><span class="Delimiter">;</span>
  while <span class="Delimiter">(</span>pos != string::npos<span class="Delimiter">)</span>
    pos = replace<span class="Delimiter">(</span>name<span class="Delimiter">,</span> <span class="Constant">&quot;</span><span class="cSpecial">\n</span><span class="Constant">&quot;</span><span class="Delimiter">,</span> <span class="Constant">&quot;</span><span class="cSpecial">\\</span><span class="Constant">n&quot;</span><span class="Delimiter">,</span> pos<span class="Delimiter">);</span>
  <span class="Identifier">return</span> <span class="Constant">&quot;{name: </span><span class="cSpecial">\&quot;</span><span class="Constant">&quot;</span>+name+<span class="Constant">&quot;</span><span class="cSpecial">\&quot;</span><span class="Constant">, properties: [_: </span><span class="cSpecial">\&quot;</span><span class="Constant">literal-string</span><span class="cSpecial">\&quot;</span><span class="Constant">]}&quot;</span><span class="Delimiter">;</span>
<span class="Delimiter">}</span>

size_t replace<span class="Delimiter">(</span>string&amp; str<span class="Delimiter">,</span> const string&amp; from<span class="Delimiter">,</span> const string&amp; to<span class="Delimiter">,</span> size_t n<span class="Delimiter">)</span> <span class="Delimiter">{</span>
  size_t result = str<span class="Delimiter">.</span>find<span class="Delimiter">(</span>from<span class="Delimiter">,</span> n<span class="Delimiter">);</span>
  if <span class="Delimiter">(</span>result != string::npos<span class="Delimiter">)</span>
    str<span class="Delimiter">.</span>replace<span class="Delimiter">(</span>result<span class="Delimiter">,</span> from<span class="Delimiter">.</span>length<span class="Delimiter">(),</span> to<span class="Delimiter">);</span>
  <span class="Identifier">return</span> result<span class="Delimiter">;</span>
<span class="Delimiter">}</span>

<span class="Delimiter">:(scenario string_literal_nested)</span>
recipe main [
  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>copy [abc [def]]
]
<span class="traceContains">+parse:   ingredient: {name: &quot;abc [def]&quot;, properties: [_: &quot;literal-string&quot;]}</span>

<span class="Delimiter">:(scenario string_literal_escaped)</span>
recipe main [
  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>copy [abc \[def]
]
<span class="traceContains">+parse:   ingredient: {name: &quot;abc [def&quot;, properties: [_: &quot;literal-string&quot;]}</span>

<span class="Delimiter">:(scenario string_literal_escaped_comment_aware)</span>
recipe main [
  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>copy [
abc \\\[def]
]
<span class="traceContains">+parse:   ingredient: {name: &quot;\nabc \[def&quot;, properties: [_: &quot;literal-string&quot;]}</span>

<span class="Delimiter">:(scenario string_literal_and_comment)</span>
recipe main [
  <span class="Constant">1</span>:address:array:character<span class="Special"> &lt;- </span>copy [abc]  <span class="Comment"># comment</span>
]
<span class="traceContains">+parse: instruction: copy</span>
<span class="traceContains">+parse:   ingredient: {name: &quot;abc&quot;, properties: [_: &quot;literal-string&quot;]}</span>
<span class="traceContains">+parse:   product: {name: &quot;1&quot;, properties: [&quot;1&quot;: &quot;address&quot;:&quot;array&quot;:&quot;character&quot;]}</span>
<span class="Comment"># no other ingredients</span>
$parse: <span class="Constant">3</span>

<span class="Delimiter">:(scenario string_literal_escapes_newlines_in_trace)</span>
recipe main [
  copy [abc
def]
]
<span class="traceContains">+parse:   ingredient: {name: &quot;abc\ndef&quot;, properties: [_: &quot;literal-string&quot;]}</span>

<span class="Delimiter">:(scenario string_literal_can_skip_past_comments)</span>
recipe main [
  copy [
    <span class="Comment"># ']' inside comment</span>
    bar
  ]
]
<span class="traceContains">+parse:   ingredient: {name: &quot;\n    # ']' inside comment\n    bar\n  &quot;, properties: [_: &quot;literal-string&quot;]}</span>

<span class="Delimiter">:(scenario string_literal_empty)</span>
recipe main [
  copy []
]
<span class="traceContains">+parse:   ingredient: {name: &quot;&quot;, properties: [_: &quot;literal-string&quot;]}</span>
</pre>
</body>
</html>
<!-- vim: set foldmethod=manual : -->