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eclipse / gerrit / www.eclipse.org / escet / 597580830dcb8a8eee89bf6c9cee15b964251830 / . / v0.1-M1 / setext / index.html
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<body class="book toc2 toc-left">
<div id="header">
<h1>SeText documentation (Incubation)</h1>
<div class="details">
<span id="author" class="author">Copyright (c) 2010, 2020 Contributors to the Eclipse Foundation</span><br>
<span id="revnumber">version 0.1.0.20210126-175926</span>
</div>
<div id="toc" class="toc2">
<div id="toctitle">Table of Contents</div>
<ul class="sectlevel1">
<li><a href="#setext-readme-lexical-syntax">SeText lexical syntax</a></li>
<li><a href="#setext-readme-specifying-lexical-syntax">Specifying lexical syntax using SeText</a></li>
<li><a href="#setext-readme-regular-expressions">Regular expressions</a></li>
<li><a href="#setext-readme-terminal-descriptions">Terminal descriptions</a></li>
<li><a href="#setext-readme-imports">Imports</a></li>
<li><a href="#setext-readme-scanner-hooks">Scanner hooks</a></li>
<li><a href="#setext-readme-specifying-grammars">Specifying grammars using SeText</a></li>
<li><a href="#setext-readme-parser-hooks">Parser hooks</a></li>
<li><a href="#setext-readme-usage-hints">Usage hints</a></li>
<li><a href="#setext-readme-generated-scanners-parsers">Generated scanners/parsers</a></li>
<li><a href="#setext-readme-using-in-an-eclipse-plugin-project">Using SeText in an Eclipse Plug-in Project</a></li>
<li><a href="#setext-readme-limitations-issues">Limitations and issues</a></li>
<li><a href="#setext-readme-release-notes">Release notes</a>
<ul class="sectlevel2">
<li><a href="#version-0-1-unreleased">Version 0.1 (unreleased)</a></li>
</ul>
</li>
<li><a href="#setext-readme-legal">Legal</a></li>
</ul>
</div>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>SeText is a textual syntax specification language and associated scanner/parser
generator. It can be used to specify the syntax of a language, and automatically
generate a scanner and LALR(1) parser(s).</p>
</div>
<div class="paragraph">
<p>SeText is one of the tools of the
<a href="https://eclipse.org/escet">Eclipse ESCET&#8482; project</a>.</p>
</div>
<div class="admonitionblock warning">
<table>
<tr>
<td class="icon">
<i class="fa icon-warning" title="Warning"></i>
</td>
<td class="content">
<div class="paragraph">
<p>The Eclipse ESCET project, including the SeText language and toolset,
is currently in the
<a href="https://wiki.eclipse.org/Development_Resources/Process_Guidelines/What_is_Incubation">Incubation Phase</a>.</p>
</div>
<div class="paragraph">
<p><span class="image"><img src="./eclipse-incubation.png" alt="eclipse incubation" width="300"></span></p>
</div>
</td>
</tr>
</table>
</div>
<div class="paragraph">
<p>For the purpose of this document, it is assumed that the reader is familiar
with scanner/parser generators (for example <em>yacc</em>/<em>bison</em> and <em>lex</em>/<em>flex</em>),
scanner and LALR(1) parser technology (including regular expressions and BNF
notation), and understands the limitations of the LALR(1) algorithm.</p>
</div>
<div class="admonitionblock tip">
<table>
<tr>
<td class="icon">
<i class="fa icon-tip" title="Tip"></i>
</td>
<td class="content">
You can <a href="eclipse-escet-incubation-setext-manual.pdf">download this manual</a>
as a PDF as well.
</td>
</tr>
</table>
</div>
<div class="paragraph">
<p>The following topics are discussed:</p>
</div>
<div class="ulist">
<ul>
<li>
<p><a href="#setext-readme-lexical-syntax">SeText lexical syntax</a></p>
</li>
<li>
<p><a href="#setext-readme-specifying-lexical-syntax">Specifying lexical syntax using SeText</a></p>
</li>
<li>
<p><a href="#setext-readme-regular-expressions">Regular expressions</a></p>
</li>
<li>
<p><a href="#setext-readme-terminal-descriptions">Terminal descriptions</a></p>
</li>
<li>
<p><a href="#setext-readme-imports">Imports</a></p>
</li>
<li>
<p><a href="#setext-readme-scanner-hooks">Scanner hooks</a></p>
</li>
<li>
<p><a href="#setext-readme-specifying-grammars">Specifying grammars using SeText</a></p>
</li>
<li>
<p><a href="#setext-readme-parser-hooks">Parser hooks</a></p>
</li>
<li>
<p><a href="#setext-readme-usage-hints">Usage hints</a></p>
</li>
<li>
<p><a href="#setext-readme-generated-scanners-parsers">Generated scanners/parsers</a></p>
</li>
<li>
<p><a href="#setext-readme-using-in-an-eclipse-plugin-project">Using SeText in an Eclipse Plug-in Project</a></p>
</li>
<li>
<p><a href="#setext-readme-limitations-issues">Limitations and issues</a></p>
</li>
<li>
<p><a href="#setext-readme-release-notes">Release notes</a></p>
</li>
<li>
<p><a href="#setext-readme-legal">Legal</a></p>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="setext-readme-lexical-syntax">SeText lexical syntax</h2>
<div class="sectionbody">
<div class="paragraph">
<p>SeText supports the following comments:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>Everything after <code>//</code> until the end of the line is a comment.</p>
</li>
<li>
<p>Everything from <code>/*</code> up to the next <code>*/</code>, possibly spanning multiple
lines, is a comment.</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>SeText keywords may be used by escaping them with a <code>$</code> character.</p>
</div>
<div class="paragraph">
<p>Whitespace (spaces, tabs, and new lines) are essentially ignored.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="setext-readme-specifying-lexical-syntax">Specifying lexical syntax using SeText</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Terminals can be specified as follows:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight"><code data-lang="setext">@terminals:
@keywords Operators = and or;
@keywords Functions = log sin cos tan;
end
@terminals:
IDTK = &quot;$?[a-zA-Z_][a-zA-Z0-9_]*&quot; {scanID};
end</code></pre>
</div>
</div>
<div class="paragraph">
<p>Here we specified two groups of terminals. The first group specifies two
keyword (sub-)groups, named <code>Operators</code> and <code>Functions</code>. For these keywords
(<code>and</code>, <code>or</code>, <code>log</code>, etc), terminals are created (<code>ANDKW</code>, <code>ORKW</code>,
<code>LOGKW</code>, etc). Furthermore, the keyword group names (<code>Operators</code> and
<code>Functions</code>) may be used as non-terminals in the grammar, to recognize
exactly one of the keyword terminals created for that keyword group.</p>
</div>
<div class="paragraph">
<p>The second group specifies an <code>IDTK</code> terminal, defined by a regular
expression (see below). The <code>{scanID}</code> part indicates that the resulting
tokens should be passed to the <code>scanID</code> method in the hooks class (see
below), to allow post-processing. Post-processing methods are also allowed
for keyword identifiers, such as <code>sin</code> and <code>cos</code> in the example.</p>
</div>
<div class="paragraph">
<p>SeText generated scanners use longest match when recognizing tokens. If two
or more terminals recognize the same longest match, priorities are used to
resolve the conflict. For the example above, the first group of terminals has
priority over the second group, thus giving the keywords priority over the
identifiers. That is, <code>@terminals</code> groups listed earlier in the specification
have higher priority than <code>@terminals</code> groups listed later in the
specification. If two terminals accept the same input, and they are defined
within the same group (they have the same priority), then the specification
is invalid.</p>
</div>
<div class="paragraph">
<p>It is also possible to use scanner states:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight"><code data-lang="setext">@terminals:
&quot;//.*&quot;;
&quot;/\*&quot; -&gt; BLOCK_COMMENT;
@eof;
end
@terminals BLOCK_COMMENT:
&quot;\*/&quot; -&gt;;
&quot;.&quot;;
&quot;\n&quot;;
end</code></pre>
</div>
</div>
<div class="paragraph">
<p>The first group of terminals is for the default state, as no state name is
specified. Single line comments (<code>// ...</code>) are detected using the first
regular expression. This expression is not given a name, and can thus not be
used in parser rules.</p>
</div>
<div class="paragraph">
<p>The second regular expression detects the start of block comments (<code>/*</code>)
and switches the scanner to the <code>BLOCK_COMMENT</code> state.</p>
</div>
<div class="paragraph">
<p>The second group of terminals is detected only when the scanner is in the
<code>BLOCK_COMMENT</code> state, as indicated by the <code>BLOCK_COMMENT</code> state name after
the <code>@terminals</code> keyword. Everything except for the end of the comment is
ignored (no name for the terminals, and no new scanner state). The end of
block comments (<code>*/</code>) makes the scanner go back to the default scanner
state (arrow without state name).</p>
</div>
<div class="paragraph">
<p>The <code>@eof</code> terminal indicates that end-of-file is allowed in a scanner
state (in this case, the default scanner state).</p>
</div>
<div class="paragraph">
<p>For every scanner, the name of the Java class to generate should be specified,
as follows:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight"><code data-lang="setext">@scanner some.package.SomeScanner;</code></pre>
</div>
</div>
<div class="paragraph">
<p>The scanner class must not be a generic class. Imports (see below) can be used
to shorten the specification of the Java class name.</p>
</div>
<div class="paragraph">
<p>Shortcuts can be used for reuse of regular expressions:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight"><code data-lang="setext">@shortcut identifier = &quot;$?[a-zA-Z_][a-zA-Z0-9_]*&quot;;
@terminals:
ID2TK = &quot;{identifier}.{identifier}&quot;;
ID3TK = &quot;{identifier}.{identifier}.{identifier}&quot;;
end</code></pre>
</div>
</div>
<div class="paragraph">
<p>It is possible to use shortcuts in other shortcuts, as long as a shortcut is
defined before its use.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="setext-readme-regular-expressions">Regular expressions</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Regular expressions are enclosed in double quotes. Within them, the following
are supported:</p>
</div>
<div class="ulist">
<ul>
<li>
<p><code>a</code> for character <code>a</code>, for any <code>a</code> (special characters need escaping).</p>
</li>
<li>
<p><code>\n</code> for the new line character (Unicode U+0A).</p>
</li>
<li>
<p><code>\r</code> for the carriage return character (Unicode U+0D).</p>
</li>
<li>
<p><code>\t</code> for the tab character (Unicode U+09).</p>
</li>
<li>
<p><code>\a</code> for character <code>a</code>, for any <code>a</code> (especially useful for escaping
special characters).</p>
</li>
<li>
<p><code>\\</code> for character <code>\</code> (escaped).</p>
</li>
<li>
<p><code>\"</code> for character <code>"</code> (escaped).</p>
</li>
<li>
<p><code>(x)</code> for regular expression <code>x</code> (allows for grouping).</p>
</li>
<li>
<p><code>xy</code> for regular expression <code>x</code> followed by regular expression <code>y</code>.</p>
</li>
<li>
<p><code>x*</code> for zero or more times regular expression <code>x</code>.</p>
</li>
<li>
<p><code>x+</code> for one or more times regular expression <code>x</code>.</p>
</li>
<li>
<p><code>x?</code> for zero or one times regular expression <code>x</code>.</p>
</li>
<li>
<p><code>.</code> for any ASCII character except <code>\n</code> (new line, Unicode U+0A).</p>
</li>
<li>
<p><code>x|y</code> for either regular expression <code>x</code> or regular expression <code>y</code>
(but not both).</p>
</li>
<li>
<p><code>[abc]</code> for exactly one of the characters <code>a</code>, <code>b</code> or <code>c</code>.</p>
</li>
<li>
<p><code>[a-z]</code> for exactly one of the characters <code>a</code>, <code>b</code>, &#8230;&#8203;, or <code>z</code>.
This notation is called a character class. Note that the ranges of
characters are based on their ASCII character codes.</p>
</li>
<li>
<p><code>[^a]</code> for any ASCII character except for character <code>a</code>. This notation
is called a negated character class.</p>
</li>
<li>
<p><code>{s}</code> for the regular expression defined by shortcut <code>s</code>.</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>To include special characters, they must always be escaped, wherever they
occur in the regular expression. For instance, regular expression <code>[a\^]</code>
recognizes either character <code>a</code> or character <code>^</code> (but not both). Here
the <code>^</code> character is escaped, as it is a special character (it may be used
at the beginning of a character class to invert the character class).</p>
</div>
<div class="paragraph">
<p>New lines are not allowed in the regular expressions themselves. Obviously,
it is possible to detect new lines using regular expressions.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="setext-readme-terminal-descriptions">Terminal descriptions</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Terminals can be given an end user readable description (just before the
semicolon), for use in parser error messages:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight"><code data-lang="setext">@terminals:
@keywords Operators = and // &quot;and&quot;
or; // &quot;or&quot;
IDTK = &quot;[a-z]+&quot; [an identifier]; // an identifier
ID2TK = &quot;[A-Z]+&quot; [ an identifier ]; // an identifier
ASNGTK = &quot;:=&quot;; // &quot;:=&quot;
@eof; // end-of-file
X = &quot;[abc]&quot;; // X
&quot;[def]&quot;; // no description</code></pre>
</div>
</div>
<div class="paragraph">
<p>Keyword literals (<code>ANDTK</code> and <code>ORTK</code> in the example above) have the
keywords surrounded by double quotes as default description. Similarly,
terminals defined by regular expressions without choice (no character classes,
star operators, etc) and using only 'graphical' characters (no control
characters, end-of-file, new lines, etc) also have the literal text that they
match (surrounded by double quotes) as default description (see <code>ASGNTK</code> in
the example above). The end-of-file token has <code>end-of-file</code> as default
description. Keywords that don&#8217;t have a description and don&#8217;t have default
descriptions as described above, get the name of the terminal as description
(see <code>X</code> in the example above). If they don&#8217;t have a name, they have no
description.</p>
</div>
<div class="paragraph">
<p>Nameless terminals are not used by the parser, and therefore do not require a
description. The end-of-file terminal has a default description, and can not be
given a custom description. Giving a terminal a custom description if it
already has a default description, leads to a warning.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="setext-readme-imports">Imports</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Java classes/types can be specified in SeText specifications using their fully
quantified names, optionally with generic type parameters:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight"><code data-lang="setext">java.util.String
java.util.List
java.util.List&lt;java.util.String&gt;</code></pre>
</div>
</div>
<div class="paragraph">
<p>but it is also possible to use imports:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight"><code data-lang="setext">@import java.util.String;
@import java.util.String as string;
@import java.util;
@import java.util as u;</code></pre>
</div>
</div>
<div class="paragraph">
<p>The first import imports <code>java.util.String</code> as <code>String</code>. The second
imports the same type as <code>string</code>. The third import imports the <code>java.util</code>
package as <code>util</code>. The fourth import imports that same package as <code>u</code>.
After these imports, the following all refer to the <code>java.util.String</code> Java
type/class:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight"><code data-lang="setext">java.util.String
util.String
u.String
String
string</code></pre>
</div>
</div>
<div class="paragraph">
<p>It is also possible to import generic types, with their type parameters
instantiated:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight"><code data-lang="setext">@import java.util.List&lt;java.util.String&gt; as stringList</code></pre>
</div>
</div>
<div class="paragraph">
<p>allowing <code>stringList</code> to be used as a short form for
<code>java.util.List&lt;java.util.String&gt;</code>.</p>
</div>
<div class="paragraph">
<p>Note that it is not possible to use imports to shorten other imports.</p>
</div>
<div class="paragraph">
<p>Finally, note that Java types where the first part of the identifier (the
part before any dot) does not refer to an import, are considered absolute.
This means that any Java type name not containing a dot, and not referring to
an import, is also considered absolute, and thus refers to a class with that
name, in the default package.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="setext-readme-scanner-hooks">Scanner hooks</h2>
<div class="sectionbody">
<div class="paragraph">
<p>As indicated above, the following SeText specification:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight"><code data-lang="setext">@terminals:
IDTK = &quot;$?[a-zA-Z_][a-zA-Z0-9_]*&quot; {scanID};
end</code></pre>
</div>
</div>
<div class="paragraph">
<p>defines a terminal <code>IDTK</code>, which if recognized, is passed to a <code>scanID</code>
method for post-processing. If such a call back hook method is specified,
a (non-generic) hooks class is required. It can be specified as follows:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight"><code data-lang="setext">@hooks some.package.SomeHooks;</code></pre>
</div>
</div>
<div class="paragraph">
<p>As for all Java types, imports can be used. For this example, the
<code>some.package.SomeHooks</code> class must have a default (parameterless)
constructor, and an instance method with the following signature:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight"><code data-lang="java"><span class="directive">public</span> <span class="type">void</span> scanID(Token token);</code></pre>
</div>
</div>
<div class="paragraph">
<p>where the <code>Token</code> class is the <code>org.eclipse.escet.setext.runtime.Token</code> class. The
method may perform in-place modifications to the <code>text</code> field of the
<code>token</code> parameter.</p>
</div>
<div class="paragraph">
<p>It is allowed to throw <code>org.eclipse.escet.setext.runtime.exceptions.SyntaxException</code>
exceptions in the hooks methods.</p>
</div>
<div class="paragraph">
<p>Note that each generated scanner has an inner interface named <code>Hooks</code> that
defines all the required call back hook methods. The hooks class must implement
the interface. This does not apply to scanners that don&#8217;t have any terminals
with call back hooks.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="setext-readme-specifying-grammars">Specifying grammars using SeText</h2>
<div class="sectionbody">
<div class="paragraph">
<p>All SeText grammars start with one or more start symbols:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight"><code data-lang="setext">@main Program : some.package.ProgramParser;
@start Expression : some.package.ExpressionParser;</code></pre>
</div>
</div>
<div class="paragraph">
<p>This specifies two start symbols, the non-terminals <code>Program</code> and
<code>Expression</code>. Each start symbol further specifies the parser class that
should be generated for that start symbol. Once again, imports are allowed,
and the classes must be non-generic.</p>
</div>
<div class="paragraph">
<p>There are two types of start symbols:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>regular start symbols (<code>@start</code> keyword)</p>
</li>
<li>
<p>main start symbols (<code>@main</code> keyword)</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>The main start symbols are exactly the same as the regular ones, except that
they must cover the entire grammar. That is, all non-terminals must be
reachable from each of the main start symbols. There is no such restriction
for regular start symbols.</p>
</div>
<div class="paragraph">
<p>The non-terminals and rules (or productions) can be specified using a BNF
like syntax, as follows:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight"><code data-lang="setext">{java.util.List&lt;some.package.SomeClass&gt;}
NonTerm : /* empty */
| NonTerm2
| NonTerm NonTerm2
| NonTerm3 @PLUSTK NonTerm3 SEMICOLTK
;</code></pre>
</div>
</div>
<div class="paragraph">
<p>This example specifies a non-terminal named <code>NonTerm</code>. Once reduced, the
call back hooks for this non-terminal must result in a Java object of type
<code>java.util.List&lt;some.package.SomeClass&gt;</code>. Here, both generic types and
imports are allowed.</p>
</div>
<div class="paragraph">
<p>The non-terminal is defined by four rules (or productions). The first rule
is empty, as clarified by the comment. The comment is obviously not required.
The second rule consists of a single non-terminal <code>NonTerm2</code>, etc.</p>
</div>
<div class="paragraph">
<p>Each non-terminal rule gives rise to a call back hook method. The parameters of
that method are determined by the symbols that make up that rule. That is,
all non-terminal are always passed to the call back hook method. Terminals
are only passed to the method if they are prefixed with a <code>@</code> character.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="setext-readme-parser-hooks">Parser hooks</h2>
<div class="sectionbody">
<div class="paragraph">
<p>For parsers, a hooks class must always be specified. The scanner and all
parsers share a single (non-generic) hooks class. The following specification
(from which we omit the scanner part):</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight"><code data-lang="setext">@hooks some.package.SomeHooks;
@import some.package.ast;
@main Expression : some.package.ExpressionParser;
{ast.Expression}
Expression : /* empty */
| Expression @PLUSTK Literal
| Expression MINUSTK Literal
;
{ast.Literal}
Literal : @IDTK
| PITK
;</code></pre>
</div>
</div>
<div class="paragraph">
<p>requires a <code>some.package.SomeHooks</code> Java class, with a default
(parameterless) constructor, and five methods, with the following signatures:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight"><code data-lang="java"><span class="directive">public</span> <span class="predefined-type">Expression</span> parseExpression1();
<span class="directive">public</span> <span class="predefined-type">Expression</span> parseExpression2(<span class="predefined-type">Expression</span> e1, Token t2, Literal l3);
<span class="directive">public</span> <span class="predefined-type">Expression</span> parseExpression3(<span class="predefined-type">Expression</span> e1, Literal l3);
<span class="directive">public</span> Literal parseLiteral1(Token t1);
<span class="directive">public</span> Literal parseLiteral2();</code></pre>
</div>
</div>
<div class="paragraph">
<p>The return types are determined by the non-terminals. The names of the methods
are formed from the text <code>parse</code>, the name of the non-terminal, and number
of the rule, within the non-terminal. Note that all numbers have equal length.
For instance <code>01</code>, <code>02</code>, <code>03</code>, &#8230;&#8203;, <code>12</code>. The parameters consist of
all the non-terminals that make up the , as well and those terminals with a
<code>@</code> before them. The types of the non-terminal parameters are the types of
the corresponding non-terminals. For terminals, the type is the
<code>org.eclipse.escet.setext.runtime.Token</code> class. The parameter names are formed from
their types (first character of the simple name of the class, in lower case),
followed by the number of the symbol in the rule, without any <code>0</code> prefixes.
All numbers start counting at one (<code>1</code>).</p>
</div>
<div class="paragraph">
<p>Note that each generated parser has an inner interface named <code>Hooks</code> that
defines all the required call back hook methods. The hooks class must implement
the interface(s). This interface specifies one additional method, which all
parser hooks classes must implement:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight"><code data-lang="java"><span class="directive">public</span> <span class="type">void</span> setParser&lt;<span class="predefined-type">Parser</span>&lt;?&gt; parser);</code></pre>
</div>
</div>
<div class="paragraph">
<p>where the <code>Parser&lt;?&gt;</code> class is the <code>org.eclipse.escet.setext.runtime.Parser</code> class.
This method is provided to allow hooks classes access to the parser that
creates the hooks class, and its source information. For more information,
see the <code>getSource</code> method of the <code>Parser</code> class.</p>
</div>
<div class="paragraph">
<p>An implementation of a hooks class for this example could look like this:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="CodeRay highlight"><code data-lang="java"><span class="keyword">package</span> <span class="namespace">some.package</span>;
<span class="keyword">import</span> <span class="include">org.eclipse.escet.setext.runtime.Parser</span>;
<span class="keyword">import</span> <span class="include">org.eclipse.escet.setext.runtime.Token</span>;
<span class="keyword">import</span> <span class="include">some.package.ast.Expression</span>;
<span class="keyword">import</span> <span class="include">some.package.ast.Literal</span>;
<span class="directive">public</span> <span class="type">class</span> <span class="class">SomeHooks</span> <span class="directive">implements</span> ExpressionParser.Hooks {
<span class="annotation">@Override</span>
<span class="directive">public</span> <span class="type">void</span> setParser(<span class="predefined-type">Parser</span>&lt;?&gt; parser) {
<span class="comment">// No need to store this...</span>
}
<span class="annotation">@Override</span>
<span class="directive">public</span> <span class="predefined-type">Expression</span> parseExpression1() {
<span class="keyword">return</span> <span class="predefined-constant">null</span>; <span class="comment">// Do something more useful here...</span>
}
<span class="annotation">@Override</span>
<span class="directive">public</span> <span class="predefined-type">Expression</span> parseExpression2(<span class="predefined-type">Expression</span> e1, Token t2, Literal l3) {
<span class="keyword">return</span> <span class="predefined-constant">null</span>; <span class="comment">// Do something more useful here...</span>
}
<span class="annotation">@Override</span>
<span class="directive">public</span> <span class="predefined-type">Expression</span> parseExpression3(<span class="predefined-type">Expression</span> e1, Literal l3) {
<span class="keyword">return</span> <span class="predefined-constant">null</span>; <span class="comment">// Do something more useful here...</span>
}
<span class="annotation">@Override</span>
<span class="directive">public</span> Literal parseLiteral1(Token t1) {
<span class="keyword">return</span> <span class="predefined-constant">null</span>; <span class="comment">// Do something more useful here...</span>
}
<span class="annotation">@Override</span>
<span class="directive">public</span> Literal parseLiteral2() {
<span class="keyword">return</span> <span class="predefined-constant">null</span>; <span class="comment">// Do something more useful here...</span>
}
}</code></pre>
</div>
</div>
<div class="paragraph">
<p>It is allowed to throw <code>org.eclipse.escet.setext.runtime.exceptions.SyntaxException</code>
exceptions in the hooks methods. Furthermore, it is allowed to add fold regions
to the parser (which then needs to be stored as it is provided via the
<code>setParser</code> hook method), using the <code>addFoldRange</code> methods of the
<code>org.eclipse.escet.setext.runtime.Parser</code> class.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="setext-readme-usage-hints">Usage hints</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Here are some hints on using SeText:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>It is recommended to name the generated and hooks classes, using the
following convention: <code>XyzScanner</code>, <code>XyzParser</code>, <code>XyzHooks</code>, for
the scanner, parser, and hooks classes of a language <code>Xyz</code> or <code>XYZ</code>.
For parsers for a part of a language, it is recommended to name the
generated parsers <code>XyzPartParser</code>, for non-terminal <code>Part</code> of language
<code>Xyz</code> or <code>XYZ</code>. Following these naming conventions ensures consistency
in the naming of the classes.</p>
</li>
<li>
<p>It is recommended to import the packages that contain the classes used
as the types of the non-terminals. For instance, import the expressions
package <code>some.long.package.name.expressions</code> as <code>expressions</code> or
<code>exprs</code>, and then use <code>{exprs.SomeClass}</code> as the type for a
non-terminal, instead of <code>{some.long.package.name.expressions.SomeClass}</code>.
Importing the package instead of the individual classes reduces the number
of imports, and also avoids conflicts between non-terminals names and
class names. For standard Java types, however, it is recommended to import
the full type. For instance, import <code>java.lang.String</code> or
<code>java.util.List</code>.</p>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="setext-readme-generated-scanners-parsers">Generated scanners/parsers</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The generated scanners and parsers depend on the <code>org.eclipse.escet.setext.runtime</code>
and <code>org.eclipse.escet.common.java</code> plug-ins. Generated scanners and parsers inherit
from the <code>org.eclipse.escet.setext.runtime.Scanner</code> class and
<code>org.eclipse.escet.setext.runtime.Parser</code> class respectively. Look at those classes for
the public API of generated scanners/parsers, as it should be fairly
self-explanatory.</p>
</div>
<div class="paragraph">
<p>Besides the scanner and parser(s), debug output is generated from which the
scanner and parser(s) can be analyzed. In particular, the debug output for
the parsers makes it possible to find out the details about conflicts in the
grammar. Furthermore, a skeleton is generated for the hooks class.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="setext-readme-using-in-an-eclipse-plugin-project">Using SeText in an Eclipse Plug-in Project</h2>
<div class="sectionbody">
<div class="paragraph">
<p>For a new language, follow these steps:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>Create a <em>Plug-in Project</em> in Eclipse.</p>
</li>
<li>
<p>Add the <code>org.eclipse.escet.common.java</code> and <code>org.eclipse.escet.setext.runtime</code> plug-ins to
the <em>Required plug-ins</em> in the project&#8217;s manifest. Also add any plug-ins
that define the classes that you will be referring to in the SeText
specification.</p>
</li>
<li>
<p>Create the Java package where your scanner, parser(s) and hooks classes
are to be stored.</p>
</li>
<li>
<p>Create a text file ending with <code>.setext</code> in that same package. Fill the
specification, and save it.</p>
</li>
<li>
<p>Right click the file in the <em>Project Explorer</em> or <em>Package Explorer</em>,
and choose the <em>Generate Parser(s)</em> action. Alternatively, right click
the text editor for the SeText specification and choose the same action.</p>
</li>
<li>
<p>Observe how the files are generated. Make sure the console is free of
warnings and errors.</p>
</li>
<li>
<p>Copy the hooks class skeleton (extension <code>.skeleton</code> to extension
<code>.java</code>), and implement the hooks.</p>
</li>
<li>
<p>You are ready to use the scanner and parser(s).</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>After changes to the SeText specification:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>Regenerate the code, as before.</p>
</li>
<li>
<p>If a <code>Hooks</code> interface has changed, update the hooks class.</p>
</li>
<li>
<p>You are ready to use the modified scanner and parser(s).</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>It may be a good idea to put the <code>.skeleton</code> file in a version control
system. That way, after regeneration, you can ask for a diff. You then
know what has changed, and how you need to update the hooks class.</p>
</div>
<div class="paragraph">
<p>Also note that if a generated <code>Hooks</code> interface changes after a regeneration,
Java will report errors for methods not yet present in the hook class.
Similarly, Java will complain about changed method signatures, and methods that
no longer exist in the <code>Hooks</code> interface (and thus have invalid <code>@Override</code>
annotations in the hooks class).</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="setext-readme-limitations-issues">Limitations and issues</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The following limitations currently apply:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>SeText only allows for the specification of scanners that accept ASCII
input.</p>
</li>
<li>
<p>SeText currently assumes UTF-8 encoded files. If the input file is actually
encoded using a different encoding, scanner exceptions may indicate the
wrong character.</p>
</li>
<li>
<p>SeText does not support grammars with conflicts (shift/reduce,
reduce/reduce, accept/reduce).</p>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="setext-readme-release-notes">Release notes</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The release notes for the releases of SeText and the associated tools, as
part of the Eclipse ESCET project, are listed below in reverse chronological
order.</p>
</div>
<div class="sect2">
<h3 id="version-0-1-unreleased">Version 0.1 (unreleased)</h3>
<div class="paragraph">
<p>The first release of SeText as part of the Eclipse ESCET project.</p>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="setext-readme-legal">Legal</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The material in this documentation is
Copyright (c) 2010, 2020 Contributors to the Eclipse Foundation.</p>
</div>
<div class="paragraph">
<p>Eclipse ESCET and ESCET are trademarks of the Eclipse Foundation.
Eclipse, and the Eclipse Logo are registered trademarks of the
Eclipse Foundation. Other names may be trademarks of their
respective owners.</p>
</div>
<div class="paragraph">
<p><strong>License</strong></p>
</div>
<div class="paragraph">
<p>The Eclipse Foundation makes available all content in this document
("Content"). Unless otherwise indicated below, the Content is provided to you
under the terms and conditions of the MIT License. A copy of the MIT License
is available at <a href="https://opensource.org/licenses/MIT" class="bare">https://opensource.org/licenses/MIT</a>. For purposes of the
MIT License, "Software" will mean the Content.</p>
</div>
<div class="paragraph">
<p>If you did not receive this Content directly from the Eclipse Foundation,
the Content is being redistributed by another party ("Redistributor") and
different terms and conditions may apply to your use of any object code in
the Content. Check the Redistributor&#8217;s license that was provided with the
Content. If no such license exists, contact the Redistributor. Unless
otherwise indicated below, the terms and conditions of the MIT License
still apply to any source code in the Content and such source code may be
obtained at <a href="http://www.eclipse.org" class="bare">http://www.eclipse.org</a>.</p>
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