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<div id="content" class="content">
<h1 class="title">GRU DeerTree specifications</h1>
<p>
<a href="https://gruos.org/deertree/stdlib.html">GRU DeerTree standard library specifications</a>
</p>
<p>
DeerTree is high-level programming language, focused on simplification of low-level development.
</p>
<div id="outline-container-org3dd932f" class="outline-2">
<h2 id="org3dd932f">Lexical items</h2>
<div class="outline-text-2" id="text-org3dd932f">
</div>
<div id="outline-container-org49c0d4c" class="outline-3">
<h3 id="org49c0d4c">Comments</h3>
<div class="outline-text-3" id="text-org49c0d4c">
<ul class="org-ul">
<li>One line comment starts with <code>//</code> and ends with a newline.</li>
<li>Multiple lines comment starts with <code>/*</code> and ends with <code>*/</code>.</li>
</ul>
</div>
</div>
<div id="outline-container-org97232f2" class="outline-3">
<h3 id="org97232f2">Tokens</h3>
<div class="outline-text-3" id="text-org97232f2">
<ul class="org-ul">
<li>Token is minimal language unit in DeerTree.</li>
<li>There several types of tokens in DeerTree: /identifiers/, /keywords/ and /punctuation/.</li>
</ul>
</div>
<div id="outline-container-org2478505" class="outline-4">
<h4 id="org2478505">Identifiers</h4>
<div class="outline-text-4" id="text-org2478505">
<ul class="org-ul">
<li>Identifiers are program elements.</li>
<li>Keywords can't be used as identifiers.</li>
</ul>
</div>
</div>
<div id="outline-container-org92fe272" class="outline-4">
<h4 id="org92fe272">Keywords</h4>
<div class="outline-text-4" id="text-org92fe272">
<ul class="org-ul">
<li>Keywords are predefined and reserved words.</li>
<li>They are associated with specific features.</li>
</ul>
</div>
<ul class="org-ul">
<li><a id="org4bb54b9"></a>DeerTree keywords:<br />
<div class="outline-text-5" id="text-org4bb54b9">
<pre class="example">
fn, import, int, double, long, float, char, byte,
string, bool, true, false, return, if, else, const,
switch, case, for, do, while, break, continue, struct,
enum, union, type, goto, unsigned, extern, strict
(auto), (until), (define) -- this is not needed
</pre>
</div>
</li>
</ul>
</div>
<div id="outline-container-org4ad9656" class="outline-4">
<h4 id="org4ad9656">Punctuation</h4>
<div class="outline-text-4" id="text-org4ad9656">
<ul class="org-ul">
<li>Punctutation is character sequence that represents operators and punctuation.</li>
</ul>
</div>
<ul class="org-ul">
<li><a id="org2c99707"></a>DeerTree punctuation:<br />
<div class="outline-text-5" id="text-org2c99707">
<pre class="example">
'+', '-', '*', '/', '%', '++', '--'
'&amp;', '&amp;&amp;', '|', '||', '^', '&lt;&lt;', '&gt;&gt;',
'+=', '-=', '*=', '/=', '%=', '&amp;=', '|=', '^=',
'&gt;', '&gt;=', '&lt;', '&lt;=', '=', '==', '!', '~'
'(', ')', '{', '}', '[', ']', ',', '.', ';', ':'
</pre>
</div>
</li>
</ul>
</div>
<div id="outline-container-org8cdf339" class="outline-4">
<h4 id="org8cdf339">Integer literals</h4>
<div class="outline-text-4" id="text-org8cdf339">
<ul class="org-ul">
<li>An integer literal is sequence of digits that represents integer contstant.</li>
<li>Prefix before integer literal sets non-decimal base of it: <code>0b</code> or <code>0B</code> - binary, <code>0o</code> or <code>0O</code> - octal, <code>0x</code> or <code>0X</code> - hexadecimal.</li>
<li>Underscores don't change literal value, if they are after base prefix. Underscores can't be before integer literal or after.</li>
</ul>
</div>
<ul class="org-ul">
<li><a id="orgbe10644"></a>Integer literals examples:<br />
<div class="outline-text-5" id="text-orgbe10644">
<pre class="example">
123
12_34
0b0101010
0B0101010
0o20
0O20
0xff
0xFF
0Xff
0XFF
0xFF_FF_FF
_12 // invalid: handled as identifier
12_ // invalid: can't be in the end of integer literal, must separate digits
12__34 // invalid: there can't be two underscores in a row
0_xff // invalid: underscore can't be in base prefix
</pre>
</div>
</li>
</ul>
</div>
<div id="outline-container-org0ef3eca" class="outline-4">
<h4 id="org0ef3eca">Float literals</h4>
<div class="outline-text-4" id="text-org0ef3eca">
<ul class="org-ul">
<li>A floating-point literal is a decimal or hexadecimal representation of a floating-point constant.</li>
<li>A decimal floating-point literal consists of an integer part (decimal digits), a decimal point, a fractional part (decimal digits), and an exponent part (e or E followed by an optional sign and decimal digits).</li>
<li>A hexadecimal floating-point literal consists of a 0x or 0X prefix, an integer part (hexadecimal digits), a radix point, a fractional part (hexadecimal digits), and an exponent part (p or P followed by an optional sign and decimal digits).</li>
<li>Underscores don't change literal value, if they are after base prefix. Underscores can't be before float literal or after.</li>
</ul>
</div>
<ul class="org-ul">
<li><a id="orge7fb76f"></a>Integer literals examples:<br />
<div class="outline-text-5" id="text-orge7fb76f">
<pre class="example">
0.
12.34
1.23456
1.e+10
3_4.
</pre>
</div>
</li>
</ul>
</div>
<div id="outline-container-org67fd75f" class="outline-4">
<h4 id="org67fd75f">Rune literals</h4>
<div class="outline-text-4" id="text-org67fd75f">
<ul class="org-ul">
<li>A rune literal represents a rune constant, an integer value identifying a Unicode code point.</li>
<li>A rune literal is expressed as one or more characters enclosed in single quotes, as in 'x' or '\n'.</li>
<li>Within the quotes, any character may appear except newline and unescaped single quote.</li>
<li>Single quoted character represents the Unicode value of the character itself, while multi-character sequences beginning with a backslash encode values in various formats.</li>
</ul>
</div>
<ul class="org-ul">
<li><a id="orgcbb41c5"></a>After backslash, certain single-character escapes represent special values<br />
<div class="outline-text-5" id="text-orgcbb41c5">
<pre class="example">
\a U+0007 alert or bell
\b U+0008 backspace
\f U+000C form feed
\n U+000A line feed or newline
\r U+000D carriage return
\t U+0009 horizontal tab
\v U+000B vertical tab
\\ U+005C backslash
\' U+0027 single quote (valid escape only within rune literals)
\" U+0022 double quote (valid escape only within string literals)
</pre>
</div>
</li>
<li><a id="orge02b86b"></a>Rune literals examples<br />
<div class="outline-text-5" id="text-orge02b86b">
<pre class="example">
'a'
'\n'
'\000'
'\xFFF'
'aa' // invalid: too many characters
</pre>
</div>
</li>
</ul>
</div>
<div id="outline-container-org62e6c96" class="outline-4">
<h4 id="org62e6c96">String literals</h4>
<div class="outline-text-4" id="text-org62e6c96">
<ul class="org-ul">
<li>A string literal represents a string constant.</li>
<li>A string is sequence of characters.</li>
<li>The text between the quotes forms the value of the literal, with backslash escapes interpreted as rune literals.</li>
</ul>
</div>
<ul class="org-ul">
<li><a id="orgd23fba9"></a>String literals examples<br />
<div class="outline-text-5" id="text-orgd23fba9">
<pre class="example">
"a"
"aaa"
"\n"
"\""
"Hello, World\n"
</pre>
</div>
</li>
</ul>
</div>
</div>
</div>
<div id="outline-container-orgd8c9712" class="outline-2">
<h2 id="orgd8c9712"><span class="todo TODO">TODO</span> Constants</h2>
</div>
<div id="outline-container-orgd2bcdb0" class="outline-2">
<h2 id="orgd2bcdb0">Variables</h2>
<div class="outline-text-2" id="text-orgd2bcdb0">
<ul class="org-ul">
<li>A variable is a location for storing a value.</li>
<li>Variables have /types/.</li>
<li>Each element of array acts as a variable.</li>
</ul>
</div>
<div id="outline-container-org68e49fd" class="outline-3">
<h3 id="org68e49fd">Variables examples</h3>
<div class="outline-text-3" id="text-org68e49fd">
<pre class="example">
int a;
float b;
char[] c;
int a = 12;
a = 34;
b = 56;
a = b;
</pre>
</div>
</div>
</div>
<div id="outline-container-org2f0b729" class="outline-2">
<h2 id="org2f0b729"><span class="todo TODO">TODO</span> Types</h2>
<div class="outline-text-2" id="text-org2f0b729">
<ul class="org-ul">
<li>A type can be defined using <code>type</code> command.</li>
</ul>
</div>
<div id="outline-container-orgecf3c87" class="outline-3">
<h3 id="orgecf3c87">Boolean types</h3>
<div class="outline-text-3" id="text-orgecf3c87">
<ul class="org-ul">
<li>A boolean type represents the set of Boolean truth values denoted by the predeclared constants <code>true</code> and <code>false</code>.</li>
<li><code>bool</code> is predeclared boolean type.</li>
</ul>
</div>
</div>
<div id="outline-container-org009286c" class="outline-3">
<h3 id="org009286c">Numeric types</h3>
<div class="outline-text-3" id="text-org009286c">
<ul class="org-ul">
<li>A numeric type represents a set of integer or floating-point values.</li>
</ul>
</div>
<div id="outline-container-orgade58f7" class="outline-4">
<h4 id="orgade58f7">Predeclared numeric types</h4>
<div class="outline-text-4" id="text-orgade58f7">
<pre class="example">
// TODO: unsigned and others
int - 32-bit integer
double - 64-bit integer
long - 64-bit integer
float - 32-bit floating-point numbers
char - 8-bit integer
byte - alias for char
</pre>
</div>
</div>
</div>
<div id="outline-container-org767bee3" class="outline-3">
<h3 id="org767bee3">String types</h3>
<div class="outline-text-3" id="text-org767bee3">
<ul class="org-ul">
<li>A string type represents the set of string values</li>
<li>A string value is a (possibly empty) sequence of character</li>
<li><code>string</code> is predeclared string type</li>
</ul>
</div>
</div>
<div id="outline-container-org04ffa8c" class="outline-3">
<h3 id="org04ffa8c">Array types</h3>
</div>
<div id="outline-container-orgcee5341" class="outline-3">
<h3 id="orgcee5341">Function types</h3>
</div>
<div id="outline-container-org4c402d3" class="outline-3">
<h3 id="org4c402d3">Dictionary types</h3>
</div>
</div>
<div id="outline-container-org60569fa" class="outline-2">
<h2 id="org60569fa"><span class="todo TODO">TODO</span> Declarations</h2>
<div class="outline-text-2" id="text-org60569fa">
</div>
<div id="outline-container-org531ea10" class="outline-3">
<h3 id="org531ea10">Label scopes</h3>
</div>
<div id="outline-container-orgfec1a31" class="outline-3">
<h3 id="orgfec1a31">Constant declarations</h3>
</div>
<div id="outline-container-orga93160c" class="outline-3">
<h3 id="orga93160c">Type declarations</h3>
</div>
<div id="outline-container-org4213441" class="outline-3">
<h3 id="org4213441">Variable declarations</h3>
<div class="outline-text-3" id="text-org4213441">
<pre class="example">
[type] [var-name];
[type] [var-name] = [value];
</pre>
</div>
</div>
<div id="outline-container-org3d98f15" class="outline-3">
<h3 id="org3d98f15">Function declarations</h3>
<div class="outline-text-3" id="text-org3d98f15">
<ul class="org-ul">
<li>A function declaration binds an identifier to function as /function name/</li>
</ul>
<pre class="example">
fn [function-name] '(' { arguments_list } ')' { '(' { type } ')' } '{' body '}'
</pre>
</div>
<div id="outline-container-orgfc87723" class="outline-4">
<h4 id="orgfc87723">Example</h4>
<div class="outline-text-4" id="text-orgfc87723">
<pre class="example">
fn inc_number(int num) (int) {
return num+1;
}
</pre>
</div>
</div>
</div>
</div>
<div id="outline-container-orgfb540a5" class="outline-2">
<h2 id="orgfb540a5"><span class="todo TODO">TODO</span> Expressions</h2>
</div>
<div id="outline-container-org860b116" class="outline-2">
<h2 id="org860b116"><span class="todo TODO">TODO</span> Statements</h2>
<div class="outline-text-2" id="text-org860b116">
</div>
<div id="outline-container-org4f9fb6f" class="outline-3">
<h3 id="org4f9fb6f">Empty statements</h3>
</div>
<div id="outline-container-org8ed90af" class="outline-3">
<h3 id="org8ed90af">Labeled statements</h3>
<div class="outline-text-3" id="text-org8ed90af">
<pre class="example">
[identifier] ':' body
</pre>
</div>
</div>
<div id="outline-container-org578ca81" class="outline-3">
<h3 id="org578ca81">Expression statements</h3>
<div class="outline-text-3" id="text-org578ca81">
<pre class="example">
expression
</pre>
</div>
</div>
<div id="outline-container-org2da9c45" class="outline-3">
<h3 id="org2da9c45">Increment/Decrement statements</h3>
<div class="outline-text-3" id="text-org2da9c45">
<pre class="example">
expression ( "++" | "--" )
</pre>
</div>
</div>
<div id="outline-container-orgdbb298c" class="outline-3">
<h3 id="orgdbb298c">Assignments</h3>
<div class="outline-text-3" id="text-orgdbb298c">
<pre class="example">
[identifier] ( '+=' | '-=' | '*=' | '/=' | '%=' | '|=' | '^=' | '&amp;=' | '=' ) expression
</pre>
</div>
</div>
<div id="outline-container-org5d5cf7b" class="outline-3">
<h3 id="org5d5cf7b">If statements</h3>
<div class="outline-text-3" id="text-org5d5cf7b">
<pre class="example">
"if" '(' condition ')' '{' body '}' ( ( "else if" | "else" ) )
</pre>
</div>
</div>
<div id="outline-container-org1057a3a" class="outline-3">
<h3 id="org1057a3a">switch statements</h3>
<div class="outline-text-3" id="text-org1057a3a">
<pre class="example">
"switch" '(' expression ')' '{' ( "case" expression | "else" ) body '}'
</pre>
</div>
</div>
<div id="outline-container-org02085fb" class="outline-3">
<h3 id="org02085fb">for statements</h3>
<div class="outline-text-3" id="text-org02085fb">
<pre class="example">
"for" '(' condition ')' '{' body '}'
</pre>
</div>
</div>
<div id="outline-container-org244aba7" class="outline-3">
<h3 id="org244aba7">while statements</h3>
<div class="outline-text-3" id="text-org244aba7">
<pre class="example">
"while" '(' condition ')' '{' body '}'
</pre>
</div>
</div>
<div id="outline-container-org991be9a" class="outline-3">
<h3 id="org991be9a">return statements</h3>
<div class="outline-text-3" id="text-org991be9a">
<ul class="org-ul">
<li>"return" statement terminates execution of function and provided result values.</li>
</ul>
<pre class="example">
return { expression }
</pre>
</div>
</div>
<div id="outline-container-org7fa9f86" class="outline-3">
<h3 id="org7fa9f86">break statements</h3>
<div class="outline-text-3" id="text-org7fa9f86">
<pre class="example">
"break"
</pre>
</div>
</div>
<div id="outline-container-orgea043ee" class="outline-3">
<h3 id="orgea043ee">continue statements</h3>
<div class="outline-text-3" id="text-orgea043ee">
<pre class="example">
"continue"
</pre>
</div>
</div>
<div id="outline-container-orgbd68d67" class="outline-3">
<h3 id="orgbd68d67">goto statements</h3>
<div class="outline-text-3" id="text-orgbd68d67">
<ul class="org-ul">
<li>"goto" statement transfers control to statement with corresponding label</li>
</ul>
<pre class="example">
goto [label]
</pre>
</div>
</div>
</div>
<div id="outline-container-org0a1219c" class="outline-2">
<h2 id="org0a1219c"><span class="todo TODO">TODO</span> Built-in functions</h2>
<div class="outline-text-2" id="text-org0a1219c">
</div>
<div id="outline-container-org7d22253" class="outline-3">
<h3 id="org7d22253"><code>sizeof()</code></h3>
</div>
<div id="outline-container-org49c914c" class="outline-3">
<h3 id="org49c914c"><code>len()</code></h3>
</div>
<div id="outline-container-org08cccd4" class="outline-3">
<h3 id="org08cccd4"><code>compare()</code></h3>
</div>
<div id="outline-container-orge066ab8" class="outline-3">
<h3 id="orge066ab8">Printing functions</h3>
<div class="outline-text-3" id="text-orge066ab8">
</div>
<div id="outline-container-org5e9e3f5" class="outline-4">
<h4 id="org5e9e3f5"><code>print();</code></h4>
</div>
<div id="outline-container-org99c8ba9" class="outline-4">
<h4 id="org99c8ba9"><code>println();</code></h4>
</div>
<div id="outline-container-org9b393ef" class="outline-4">
<h4 id="org9b393ef"><code>fprint();</code></h4>
</div>
<div id="outline-container-orgdd23359" class="outline-4">
<h4 id="orgdd23359"><code>fprintln()</code></h4>
</div>
<div id="outline-container-orgfe8bd91" class="outline-4">
<h4 id="orgfe8bd91"><code>sprint();</code></h4>
</div>
<div id="outline-container-org52a773a" class="outline-4">
<h4 id="org52a773a"><code>sprintln()</code></h4>
</div>
<div id="outline-container-org0e65bec" class="outline-4">
<h4 id="org0e65bec"><code>eprint();</code></h4>
</div>
<div id="outline-container-org536902e" class="outline-4">
<h4 id="org536902e"><code>eprintln()</code></h4>
</div>
</div>
<div id="outline-container-org8fc67a3" class="outline-3">
<h3 id="org8fc67a3">Converting functions</h3>
<div class="outline-text-3" id="text-org8fc67a3">
</div>
<div id="outline-container-org9ab87da" class="outline-4">
<h4 id="org9ab87da"><code>int()</code></h4>
</div>
<div id="outline-container-org11800e6" class="outline-4">
<h4 id="org11800e6"><code>float()</code></h4>
</div>
<div id="outline-container-orge0a7185" class="outline-4">
<h4 id="orge0a7185"><code>char()</code></h4>
</div>
<div id="outline-container-org8047085" class="outline-4">
<h4 id="org8047085"><code>str()</code></h4>
</div>
</div>
</div>
<div id="outline-container-orgb49e7cf" class="outline-2">
<h2 id="orgb49e7cf"><span class="todo TODO">TODO</span> Headers</h2>
</div>
</div>
</body>
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