annotate website/src/diff.html.luan @ 479:1285c52ea9d4

add manual heading_options
author Franklin Schmidt <fschmidt@gmail.com>
date Mon, 11 May 2015 15:29:29 -0600
parents 9b51e2413cab
children 0db144c98564
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
386
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
1 local Io = require "luan:Io"
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
2 local Html = require "luan:Html"
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
3 local Http = require "luan:web/Http"
387
23d075ce1e48 add website/src/Shared.luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 386
diff changeset
4 local Shared = require "site:/Shared"
479
1285c52ea9d4 add manual heading_options
Franklin Schmidt <fschmidt@gmail.com>
parents: 468
diff changeset
5 local Manual = require "site:/manual.html"
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
6
479
1285c52ea9d4 add manual heading_options
Franklin Schmidt <fschmidt@gmail.com>
parents: 468
diff changeset
7 heading_options = Manual.heading_options
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
8
386
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
9 function service()
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
10 Io.stdout = Http.response.text_writer()
391
2f5cc9c2cbf0 replace Html.simply_html_page with simply_html_head and simply_html_body_bottom
Franklin Schmidt <fschmidt@gmail.com>
parents: 390
diff changeset
11 %>
2f5cc9c2cbf0 replace Html.simply_html_page with simply_html_head and simply_html_body_bottom
Franklin Schmidt <fschmidt@gmail.com>
parents: 390
diff changeset
12 <html>
2f5cc9c2cbf0 replace Html.simply_html_page with simply_html_head and simply_html_body_bottom
Franklin Schmidt <fschmidt@gmail.com>
parents: 390
diff changeset
13 <head>
2f5cc9c2cbf0 replace Html.simply_html_page with simply_html_head and simply_html_body_bottom
Franklin Schmidt <fschmidt@gmail.com>
parents: 390
diff changeset
14 <% Html.simply_html_head() %>
2f5cc9c2cbf0 replace Html.simply_html_page with simply_html_head and simply_html_body_bottom
Franklin Schmidt <fschmidt@gmail.com>
parents: 390
diff changeset
15 <title>How Luan differs from Lua</title>
2f5cc9c2cbf0 replace Html.simply_html_page with simply_html_head and simply_html_body_bottom
Franklin Schmidt <fschmidt@gmail.com>
parents: 390
diff changeset
16 </head>
2f5cc9c2cbf0 replace Html.simply_html_page with simply_html_head and simply_html_body_bottom
Franklin Schmidt <fschmidt@gmail.com>
parents: 390
diff changeset
17 <body>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
18
386
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
19 <div container>
387
23d075ce1e48 add website/src/Shared.luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 386
diff changeset
20 <% Shared.header() %>
386
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
21 <h1>How Luan differs from Lua</h1>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
22
386
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
23 <p>This document explains how Luan differs from <a href="http://www.lua.org">Lua</a> as described in the <a href="http://www.lua.org/manual/5.3/">Lua 5.3 Reference Manual</a>.</p>
372
f08cefa4594c start editing manual
Franklin Schmidt <fschmidt@gmail.com>
parents: 370
diff changeset
24
386
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
25 <hr/>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
26
386
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
27 <h2>Contents</h2>
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
28
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
29 <div margin-bottom="1em"><a href="#intro">Introduction</a></div>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
30
386
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
31 <div margin-bottom="1em">
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
32 <a href="#basic">Basic Concepts</a>
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
33 <ul>
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
34 <li><a href="#types">Values and Types</a></li>
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
35 <li><a href="#env">Environments</a></li>
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
36 <li><a href="#error">Error Handling</a></li>
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
37 <li><a href="#meta">Metatables and Metamethods</a></li>
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
38 <li><a href="#gc">Garbage Collection</a></li>
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
39 <li><a href="#coroutines">Coroutines</a></li>
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
40 </ul>
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
41 </div>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
42
386
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
43 <div margin-bottom="1em">
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
44 <a href="#lang">The Language</a>
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
45 <ul>
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
46 <li><a href="#lex">Lexical Conventions</a></li>
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
47 <li>
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
48 <a href="#stmt">Statements</a>
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
49 <ul>
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
50 <li><a href="#control">Control Structures</a></li>
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
51 <li><a href="#for">For Statement</a></li>
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
52 <li><a href="#logical">Logical Statements</a></li>
465
47c7de1f2322 documentation work
Franklin Schmidt <fschmidt@gmail.com>
parents: 464
diff changeset
53 <li><a href="#template_stmt">Template Statements</a></li>
386
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
54 </ul>
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
55 </li>
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
56 <li>
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
57 <a href="#expr">Expressions</a>
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
58 <ul>
465
47c7de1f2322 documentation work
Franklin Schmidt <fschmidt@gmail.com>
parents: 464
diff changeset
59 <li><a href="#conversions">Coercions and Conversions</a></li>
386
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
60 <li><a href="#bit">Bitwise Operators</a></li>
465
47c7de1f2322 documentation work
Franklin Schmidt <fschmidt@gmail.com>
parents: 464
diff changeset
61 <li><a href="#logical_ops">Logical Operators</a></li>
47c7de1f2322 documentation work
Franklin Schmidt <fschmidt@gmail.com>
parents: 464
diff changeset
62 <li><a href="#concatenation">Concatenation</a></li>
47c7de1f2322 documentation work
Franklin Schmidt <fschmidt@gmail.com>
parents: 464
diff changeset
63 <li><a href="#fn_calls">Function Calls</a></li>
47c7de1f2322 documentation work
Franklin Schmidt <fschmidt@gmail.com>
parents: 464
diff changeset
64 <li><a href="#template_expr">Template Expressions</a></li>
386
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
65 </ul>
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
66 </li>
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
67 </ul>
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
68 </div>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
69
386
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
70 <hr/>
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
71
479
1285c52ea9d4 add manual heading_options
Franklin Schmidt <fschmidt@gmail.com>
parents: 468
diff changeset
72 <h2 <%=heading_options%> ><a name="intro">Introduction</a></h2>
372
f08cefa4594c start editing manual
Franklin Schmidt <fschmidt@gmail.com>
parents: 370
diff changeset
73
386
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
74 <p>Lua is one of the simplest languages available, but Luan is even simpler. This means Luan removes more than it adds. Most of what is added is added in the library, not in the language itself.</p>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
75
386
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
76 <p>Luan is implemented in Java and is tightly integrated with Java. This makes it an excellent scripting language for Java.</p>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
77
479
1285c52ea9d4 add manual heading_options
Franklin Schmidt <fschmidt@gmail.com>
parents: 468
diff changeset
78 <h2 <%=heading_options%> ><a name="basic">Basic Concepts</a></h2>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
79
479
1285c52ea9d4 add manual heading_options
Franklin Schmidt <fschmidt@gmail.com>
parents: 468
diff changeset
80 <h3 <%=heading_options%> ><a name="types">Values and Types</a></h3>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
81
464
eddf7c73373b fix references in the manual
Franklin Schmidt <fschmidt@gmail.com>
parents: 391
diff changeset
82 <p>Luan does not have the Lua <i>thread</i> type. Luan adds a <i>binary</i> type that Lua doesn't have. This is because Lua strings can represent binary while Luan strings cannot.</p>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
83
386
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
84 <p>The Luan <i>Nil</i> type is implemented as the Java <i>null</i>. The Luan <i>Boolean</i> type is implemented as the Java <i>Boolean</i> type. The Luan <i>Number</i> type is implemented as the Java <i>Number</i> type. The Luan <i>String</i> type is implemented as the Java <i>String</i> type. Actual numbers may be any subclass of the Java <i>Number</i> class.</p>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
85
386
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
86 <p>Luan functions may be written in Luan or may be wrappers around native Java methods. Any Java method may be called as a Luan function.</p>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
87
386
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
88 <p>Luan <i>userdata</i> is nothing more than a Java object that doesn't fall into one of the other recognized types.</p>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
89
386
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
90 <p>The Luan <i>binary</i> type is the Java <i>byte[ ]</i> type which is an array of bytes.</p>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
91
386
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
92 <p>The Luan <i>table</i> type is just like its Lua equivalent, but implemented in Java.</p>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
93
479
1285c52ea9d4 add manual heading_options
Franklin Schmidt <fschmidt@gmail.com>
parents: 468
diff changeset
94 <h3 <%=heading_options%> ><a name="env">Environments</a></h3>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
95
386
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
96 <p>Luan has an <tt>_ENV</tt> which is like its Lua equivalent. However Luan has no global environment at all, no <tt>_G</tt>.</p>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
97
386
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
98 <p>Every module is initialized with two local functions: <tt>require</tt> and <tt>java</tt>. The module then uses these functions to get access to whatever else it needs.</p>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
99
479
1285c52ea9d4 add manual heading_options
Franklin Schmidt <fschmidt@gmail.com>
parents: 468
diff changeset
100 <h3 <%=heading_options%> ><a name="error">Error Handling</a></h3>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
101
386
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
102 <p>Luan has the functions <tt>error</tt> and <tt>pcall</tt> but does not have <tt>xpcall</tt>. Luan adds the function <tt>try</tt> which looks and acts like try-catch blocks in other languages.</p>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
103
479
1285c52ea9d4 add manual heading_options
Franklin Schmidt <fschmidt@gmail.com>
parents: 468
diff changeset
104 <h3 <%=heading_options%> ><a name="meta">Metatables and Metamethods</a></h3>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
105
465
47c7de1f2322 documentation work
Franklin Schmidt <fschmidt@gmail.com>
parents: 464
diff changeset
106 <p>Luan only has metatable for tables, not for other types.</p>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
107
479
1285c52ea9d4 add manual heading_options
Franklin Schmidt <fschmidt@gmail.com>
parents: 468
diff changeset
108 <h3 <%=heading_options%> ><a name="gc">Garbage Collection</a></h3>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
109
386
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
110 <p>Luan uses Java garbage collection. Luan has no special garbage collection methods.</p>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
111
386
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
112 <p>Luan does not yet have weak tables but this will be added.</p>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
113
479
1285c52ea9d4 add manual heading_options
Franklin Schmidt <fschmidt@gmail.com>
parents: 468
diff changeset
114 <h3 <%=heading_options%> ><a name="coroutines">Coroutines</a></h3>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
115
386
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
116 <p>Luan does not have coroutines. Coroutines is a complex concept that isn't needed in a simple language, so it was left out.</p>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
117
479
1285c52ea9d4 add manual heading_options
Franklin Schmidt <fschmidt@gmail.com>
parents: 468
diff changeset
118 <h2 <%=heading_options%> ><a name="lang">The Language</a></h2>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
119
479
1285c52ea9d4 add manual heading_options
Franklin Schmidt <fschmidt@gmail.com>
parents: 468
diff changeset
120 <h3 <%=heading_options%> ><a name="lex">Lexical Conventions</a></h3>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
121
386
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
122 <p>Unlike Lua, Luan generally considers the end of a line to be the end of a statement. This catches errors and encourages readability. The exception to this is in paranthesis ( <i>(...)</i>, <i>[...]</i>, and <i>{...}</i> ) where the end of line is treated as white space.</p>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
123
386
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
124 <p>Luan has exactly the same set of keywords as Lua and has the same other lexical conventions.</p>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
125
479
1285c52ea9d4 add manual heading_options
Franklin Schmidt <fschmidt@gmail.com>
parents: 468
diff changeset
126 <h3 <%=heading_options%> ><a name="stmt">Statements</a></h3>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
127
386
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
128 <p>Most statements in Luan are the same as Lua. Only those statements that differ will be listed here.</p>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
129
479
1285c52ea9d4 add manual heading_options
Franklin Schmidt <fschmidt@gmail.com>
parents: 468
diff changeset
130 <h4 <%=heading_options%> ><a name="control">Control Structures</a></h4>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
131
386
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
132 <p>The Luan <b>if</b>, <b>while</b>, and <b>repeat</b> statement are the same as in Lua except that the condition expression must return a boolean value. Any other value type will produce an error. This helps catch errors and makes code more readable.</p>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
133
386
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
134 <p>Luan does not have a <b>goto</b> statement.</p>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
135
479
1285c52ea9d4 add manual heading_options
Franklin Schmidt <fschmidt@gmail.com>
parents: 468
diff changeset
136 <h4 <%=heading_options%> ><a name="for">For Statement</a></h4>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
137
386
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
138 <p>Luan has no numeric <b>for</b> statement. Luan only has generic <b>for</b> statement. Instead of the numeric <b>for</b> statement, Luan uses the <tt>range</tt> function in a generic <b>for</b> statement like this:</p>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
139
389
497d4ef0a89f documentation work
Franklin Schmidt <fschmidt@gmail.com>
parents: 387
diff changeset
140 <p><tt><pre>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
141 for i in range(from,to,step) do <i>block</i> end
389
497d4ef0a89f documentation work
Franklin Schmidt <fschmidt@gmail.com>
parents: 387
diff changeset
142 </pre></tt></p>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
143
468
9b51e2413cab documentation
Franklin Schmidt <fschmidt@gmail.com>
parents: 465
diff changeset
144 <p>The Luan generic <b>for</b> statement is simpler than the Lua version because Luan only uses an expression, not an explist. So a <b>for</b> statement like:</p>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
145
389
497d4ef0a89f documentation work
Franklin Schmidt <fschmidt@gmail.com>
parents: 387
diff changeset
146 <p><tt><pre>
390
Franklin Schmidt <fschmidt@gmail.com>
parents: 389
diff changeset
147 for var_1, &middot;&middot;&middot;, var_n in exp do block end
389
497d4ef0a89f documentation work
Franklin Schmidt <fschmidt@gmail.com>
parents: 387
diff changeset
148 </pre></tt></p>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
149
389
497d4ef0a89f documentation work
Franklin Schmidt <fschmidt@gmail.com>
parents: 387
diff changeset
150 <p>is equivalent to the code:</p>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
151
389
497d4ef0a89f documentation work
Franklin Schmidt <fschmidt@gmail.com>
parents: 387
diff changeset
152 <p><tt><pre>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
153 do
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
154 local f = exp
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
155 while true do
390
Franklin Schmidt <fschmidt@gmail.com>
parents: 389
diff changeset
156 local var_1, &middot;&middot;&middot;, var_n = f()
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
157 if var_1 == nil then break end
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
158 block
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
159 end
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
160 end
389
497d4ef0a89f documentation work
Franklin Schmidt <fschmidt@gmail.com>
parents: 387
diff changeset
161 </pre></tt></p>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
162
479
1285c52ea9d4 add manual heading_options
Franklin Schmidt <fschmidt@gmail.com>
parents: 468
diff changeset
163 <h4 <%=heading_options%> ><a name="logical">Logical Statements</a></h4>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
164
386
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
165 <p>Unlike Lua, Luan allows <b>or</b> and <b>and</b> expressions to be stand-alone statements. This is useful in cases like this:</p>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
166
389
497d4ef0a89f documentation work
Franklin Schmidt <fschmidt@gmail.com>
parents: 387
diff changeset
167 <p><tt><pre>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
168 x==5 or error "x should be 5"
389
497d4ef0a89f documentation work
Franklin Schmidt <fschmidt@gmail.com>
parents: 387
diff changeset
169 </pre></tt></p>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
170
479
1285c52ea9d4 add manual heading_options
Franklin Schmidt <fschmidt@gmail.com>
parents: 468
diff changeset
171 <h4 <%=heading_options%> ><a name="template_stmt">Template Statements</a></h4>
367
c207be7cf45d more documentation
Franklin Schmidt <fschmidt@gmail.com>
parents: 354
diff changeset
172
465
47c7de1f2322 documentation work
Franklin Schmidt <fschmidt@gmail.com>
parents: 464
diff changeset
173 <p>Template statements are a Luan addition that don't exist in Lua. See <a href="manual.html#template_stmt">Template Statements</a> in the Luan Reference Manual.</p>
367
c207be7cf45d more documentation
Franklin Schmidt <fschmidt@gmail.com>
parents: 354
diff changeset
174
c207be7cf45d more documentation
Franklin Schmidt <fschmidt@gmail.com>
parents: 354
diff changeset
175
479
1285c52ea9d4 add manual heading_options
Franklin Schmidt <fschmidt@gmail.com>
parents: 468
diff changeset
176 <h3 <%=heading_options%> ><a name="expr">Expressions</a></h3>
367
c207be7cf45d more documentation
Franklin Schmidt <fschmidt@gmail.com>
parents: 354
diff changeset
177
479
1285c52ea9d4 add manual heading_options
Franklin Schmidt <fschmidt@gmail.com>
parents: 468
diff changeset
178 <h4 <%=heading_options%> ><a name="conversions">Coercions and Conversions</a></h4>
465
47c7de1f2322 documentation work
Franklin Schmidt <fschmidt@gmail.com>
parents: 464
diff changeset
179
47c7de1f2322 documentation work
Franklin Schmidt <fschmidt@gmail.com>
parents: 464
diff changeset
180 <p>Unlike Lua, Luan does not do automatic conversions of strings to numbers.</p>
47c7de1f2322 documentation work
Franklin Schmidt <fschmidt@gmail.com>
parents: 464
diff changeset
181
479
1285c52ea9d4 add manual heading_options
Franklin Schmidt <fschmidt@gmail.com>
parents: 468
diff changeset
182 <h4 <%=heading_options%> ><a name="bit">Bitwise Operators</a></h4>
367
c207be7cf45d more documentation
Franklin Schmidt <fschmidt@gmail.com>
parents: 354
diff changeset
183
465
47c7de1f2322 documentation work
Franklin Schmidt <fschmidt@gmail.com>
parents: 464
diff changeset
184 <p>Bitwise operators appear to be a new addition to Lua 5.3 and didn't exist in Lua 5.2. Luan does not support bitwise operators, but these can be added if there is a need.</p>
367
c207be7cf45d more documentation
Franklin Schmidt <fschmidt@gmail.com>
parents: 354
diff changeset
185
479
1285c52ea9d4 add manual heading_options
Franklin Schmidt <fschmidt@gmail.com>
parents: 468
diff changeset
186 <h4 <%=heading_options%> ><a name="logical_ops">Logical Operators</a></h4>
367
c207be7cf45d more documentation
Franklin Schmidt <fschmidt@gmail.com>
parents: 354
diff changeset
187
386
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
188 <p>The only change in Luan is that <b>not</b> must take a boolean argument. This helps catch errors and makes code more readable.</p>
367
c207be7cf45d more documentation
Franklin Schmidt <fschmidt@gmail.com>
parents: 354
diff changeset
189
479
1285c52ea9d4 add manual heading_options
Franklin Schmidt <fschmidt@gmail.com>
parents: 468
diff changeset
190 <h4 <%=heading_options%> ><a name="concatenation">Concatenation</a></h4>
465
47c7de1f2322 documentation work
Franklin Schmidt <fschmidt@gmail.com>
parents: 464
diff changeset
191
47c7de1f2322 documentation work
Franklin Schmidt <fschmidt@gmail.com>
parents: 464
diff changeset
192 <p>Unlike Lua, Luan converts all concatenation operands to strings.
47c7de1f2322 documentation work
Franklin Schmidt <fschmidt@gmail.com>
parents: 464
diff changeset
193
479
1285c52ea9d4 add manual heading_options
Franklin Schmidt <fschmidt@gmail.com>
parents: 468
diff changeset
194 <h4 <%=heading_options%> ><a name="fn_calls">Function Calls</a></h4>
367
c207be7cf45d more documentation
Franklin Schmidt <fschmidt@gmail.com>
parents: 354
diff changeset
195
386
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
196 <p>Luan does not support Lua's <tt>v:name(args)</tt> style object-oriented function call. Object oriented programming is done in Luan using closures, so this feature is not needed.</p>
367
c207be7cf45d more documentation
Franklin Schmidt <fschmidt@gmail.com>
parents: 354
diff changeset
197
479
1285c52ea9d4 add manual heading_options
Franklin Schmidt <fschmidt@gmail.com>
parents: 468
diff changeset
198 <h4 <%=heading_options%> ><a name="template_expr">Template Expressions</a></h4>
367
c207be7cf45d more documentation
Franklin Schmidt <fschmidt@gmail.com>
parents: 354
diff changeset
199
465
47c7de1f2322 documentation work
Franklin Schmidt <fschmidt@gmail.com>
parents: 464
diff changeset
200 <p>Template expressions are a Luan addition that don't exist in Lua. See <a href="manual.html#template_expr">Template Expressions</a> in the Luan Reference Manual.</p>
367
c207be7cf45d more documentation
Franklin Schmidt <fschmidt@gmail.com>
parents: 354
diff changeset
201
386
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
202 </div>
353
38c19ecc384d start documentation
Franklin Schmidt <fschmidt@gmail.com>
parents:
diff changeset
203
391
2f5cc9c2cbf0 replace Html.simply_html_page with simply_html_head and simply_html_body_bottom
Franklin Schmidt <fschmidt@gmail.com>
parents: 390
diff changeset
204 <% Html.simply_html_body_bottom() %>
2f5cc9c2cbf0 replace Html.simply_html_page with simply_html_head and simply_html_body_bottom
Franklin Schmidt <fschmidt@gmail.com>
parents: 390
diff changeset
205 </body>
2f5cc9c2cbf0 replace Html.simply_html_page with simply_html_head and simply_html_body_bottom
Franklin Schmidt <fschmidt@gmail.com>
parents: 390
diff changeset
206 </html>
2f5cc9c2cbf0 replace Html.simply_html_page with simply_html_head and simply_html_body_bottom
Franklin Schmidt <fschmidt@gmail.com>
parents: 390
diff changeset
207 <%
386
db23f654f87d make all of website use luan
Franklin Schmidt <fschmidt@gmail.com>
parents: 372
diff changeset
208 end