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| author | Franklin Schmidt <fschmidt@gmail.com> |
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| date | Fri, 08 May 2015 17:29:28 -0600 |
| parents | 47c7de1f2322 |
| children | 1285c52ea9d4 |
| rev | line source |
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1 local Io = require "luan:Io" |
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2 local Html = require "luan:Html" |
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3 local Http = require "luan:web/Http" |
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4 local Shared = require "site:/Shared" |
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7 function service() |
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8 Io.stdout = Http.response.text_writer() |
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9 %> |
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10 <html> |
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11 <head> |
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12 <% Html.simply_html_head() %> |
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13 <title>How Luan differs from Lua</title> |
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14 </head> |
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15 <body> |
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17 <div container> |
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18 <% Shared.header() %> |
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19 <h1>How Luan differs from Lua</h1> |
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21 <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 | 22 |
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23 <hr/> |
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25 <h2>Contents</h2> |
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26 |
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27 <div margin-bottom="1em"><a href="#intro">Introduction</a></div> |
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29 <div margin-bottom="1em"> |
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30 <a href="#basic">Basic Concepts</a> |
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31 <ul> |
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32 <li><a href="#types">Values and Types</a></li> |
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33 <li><a href="#env">Environments</a></li> |
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34 <li><a href="#error">Error Handling</a></li> |
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35 <li><a href="#meta">Metatables and Metamethods</a></li> |
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36 <li><a href="#gc">Garbage Collection</a></li> |
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37 <li><a href="#coroutines">Coroutines</a></li> |
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38 </ul> |
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39 </div> |
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41 <div margin-bottom="1em"> |
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42 <a href="#lang">The Language</a> |
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43 <ul> |
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44 <li><a href="#lex">Lexical Conventions</a></li> |
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45 <li> |
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46 <a href="#stmt">Statements</a> |
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47 <ul> |
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48 <li><a href="#control">Control Structures</a></li> |
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49 <li><a href="#for">For Statement</a></li> |
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50 <li><a href="#logical">Logical Statements</a></li> |
| 465 | 51 <li><a href="#template_stmt">Template Statements</a></li> |
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52 </ul> |
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53 </li> |
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54 <li> |
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55 <a href="#expr">Expressions</a> |
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56 <ul> |
| 465 | 57 <li><a href="#conversions">Coercions and Conversions</a></li> |
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58 <li><a href="#bit">Bitwise Operators</a></li> |
| 465 | 59 <li><a href="#logical_ops">Logical Operators</a></li> |
| 60 <li><a href="#concatenation">Concatenation</a></li> | |
| 61 <li><a href="#fn_calls">Function Calls</a></li> | |
| 62 <li><a href="#template_expr">Template Expressions</a></li> | |
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63 </ul> |
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64 </li> |
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65 </ul> |
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66 </div> |
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68 <hr/> |
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69 |
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70 <h2 margin-top="1em"><a name="intro">Introduction</a></h2> |
| 372 | 71 |
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72 <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> |
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74 <p>Luan is implemented in Java and is tightly integrated with Java. This makes it an excellent scripting language for Java.</p> |
| 353 | 75 |
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76 <h2 margin-top="1em"><a name="basic">Basic Concepts</a></h2> |
| 353 | 77 |
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78 <h3 margin-top="1em"><a name="types">Values and Types</a></h3> |
| 353 | 79 |
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80 <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 | 81 |
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82 <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 | 83 |
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84 <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 | 85 |
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86 <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 | 87 |
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88 <p>The Luan <i>binary</i> type is the Java <i>byte[ ]</i> type which is an array of bytes.</p> |
| 353 | 89 |
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90 <p>The Luan <i>table</i> type is just like its Lua equivalent, but implemented in Java.</p> |
| 353 | 91 |
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92 <h3 margin-top="1em"><a name="env">Environments</a></h3> |
| 353 | 93 |
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94 <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 | 95 |
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96 <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 | 97 |
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98 <h3 margin-top="1em"><a name="error">Error Handling</a></h3> |
| 353 | 99 |
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100 <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 | 101 |
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102 <h3 margin-top="1em"><a name="meta">Metatables and Metamethods</a></h3> |
| 353 | 103 |
| 465 | 104 <p>Luan only has metatable for tables, not for other types.</p> |
| 353 | 105 |
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106 <h3 margin-top="1em"><a name="gc">Garbage Collection</a></h3> |
| 353 | 107 |
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108 <p>Luan uses Java garbage collection. Luan has no special garbage collection methods.</p> |
| 353 | 109 |
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110 <p>Luan does not yet have weak tables but this will be added.</p> |
| 353 | 111 |
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112 <h3 margin-top="1em"><a name="coroutines">Coroutines</a></h3> |
| 353 | 113 |
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114 <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 | 115 |
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116 <h2 margin-top="1em"><a name="lang">The Language</a></h2> |
| 353 | 117 |
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118 <h3 margin-top="1em"><a name="lex">Lexical Conventions</a></h3> |
| 353 | 119 |
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120 <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 | 121 |
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122 <p>Luan has exactly the same set of keywords as Lua and has the same other lexical conventions.</p> |
| 353 | 123 |
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124 <h3 margin-top="1em"><a name="stmt">Statements</a></h3> |
| 353 | 125 |
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126 <p>Most statements in Luan are the same as Lua. Only those statements that differ will be listed here.</p> |
| 353 | 127 |
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128 <h4 margin-top="1em"><a name="control">Control Structures</a></h4> |
| 353 | 129 |
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130 <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 | 131 |
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132 <p>Luan does not have a <b>goto</b> statement.</p> |
| 353 | 133 |
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134 <h4 margin-top="1em"><a name="for">For Statement</a></h4> |
| 353 | 135 |
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136 <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 | 137 |
| 389 | 138 <p><tt><pre> |
| 353 | 139 for i in range(from,to,step) do <i>block</i> end |
| 389 | 140 </pre></tt></p> |
| 353 | 141 |
| 468 | 142 <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 | 143 |
| 389 | 144 <p><tt><pre> |
| 390 | 145 for var_1, ···, var_n in exp do block end |
| 389 | 146 </pre></tt></p> |
| 353 | 147 |
| 389 | 148 <p>is equivalent to the code:</p> |
| 353 | 149 |
| 389 | 150 <p><tt><pre> |
| 353 | 151 do |
| 152 local f = exp | |
| 153 while true do | |
| 390 | 154 local var_1, ···, var_n = f() |
| 353 | 155 if var_1 == nil then break end |
| 156 block | |
| 157 end | |
| 158 end | |
| 389 | 159 </pre></tt></p> |
| 353 | 160 |
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161 <h4 margin-top="1em"><a name="logical">Logical Statements</a></h4> |
| 353 | 162 |
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163 <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 | 164 |
| 389 | 165 <p><tt><pre> |
| 353 | 166 x==5 or error "x should be 5" |
| 389 | 167 </pre></tt></p> |
| 353 | 168 |
| 465 | 169 <h4 margin-top="1em"><a name="template_stmt">Template Statements</a></h4> |
| 367 | 170 |
| 465 | 171 <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 | 172 |
| 173 | |
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174 <h3 margin-top="1em"><a name="expr">Expressions</a></h3> |
| 367 | 175 |
| 465 | 176 <h4 margin-top="1em"><a name="conversions">Coercions and Conversions</a></h4> |
| 177 | |
| 178 <p>Unlike Lua, Luan does not do automatic conversions of strings to numbers.</p> | |
| 179 | |
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180 <h4 margin-top="1em"><a name="bit">Bitwise Operators</a></h4> |
| 367 | 181 |
| 465 | 182 <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 | 183 |
| 465 | 184 <h4 margin-top="1em"><a name="logical_ops">Logical Operators</a></h4> |
| 367 | 185 |
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186 <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 | 187 |
| 465 | 188 <h4 margin-top="1em"><a name="concatenation">Concatenation</a></h4> |
| 189 | |
| 190 <p>Unlike Lua, Luan converts all concatenation operands to strings. | |
| 191 | |
| 192 <h4 margin-top="1em"><a name="fn_calls">Function Calls</a></h4> | |
| 367 | 193 |
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194 <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 | 195 |
| 465 | 196 <h4 margin-top="1em"><a name="template_expr">Template Expressions</a></h4> |
| 367 | 197 |
| 465 | 198 <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 | 199 |
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200 </div> |
| 353 | 201 |
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202 <% Html.simply_html_body_bottom() %> |
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203 </body> |
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204 </html> |
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205 <% |
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206 end |