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260 lines
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<link href="R6RS-I_002fO-Conditions.html" rel="next" title="R6RS I/O Conditions">
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<div class="subsubsection-level-extent" id="rnrs-conditions">
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Next: <a href="R6RS-I_002fO-Conditions.html" accesskey="n" rel="next">I/O Conditions</a>, Previous: <a href="rnrs-exceptions.html" accesskey="p" rel="prev">rnrs exceptions</a>, Up: <a href="R6RS-Standard-Libraries.html" accesskey="u" rel="up">R6RS Standard Libraries</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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<hr>
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<h4 class="subsubsection" id="rnrs-conditions-1"><span>7.6.2.13 rnrs conditions<a class="copiable-link" href="#rnrs-conditions-1"> ¶</a></span></h4>
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<p>The <code class="code">(rnrs condition (6))</code> library provides forms and procedures
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for constructing new condition types, as well as a library of
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pre-defined condition types that represent a variety of common
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exceptional situations. Conditions are records of a subtype of the
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<code class="code">&condition</code> record type, which is neither sealed nor opaque.
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See <a class="xref" href="R6RS-Records.html">R6RS Records</a>.
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</p>
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<p>Conditions may be manipulated singly, as <em class="dfn">simple conditions</em>, or
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when composed with other conditions to form <em class="dfn">compound conditions</em>.
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Compound conditions do not “nest”—constructing a new compound
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condition out of existing compound conditions will “flatten” them
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into their component simple conditions. For example, making a new
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condition out of a <code class="code">&message</code> condition and a compound condition
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that contains an <code class="code">&assertion</code> condition and another <code class="code">&message</code>
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condition will produce a compound condition that contains two
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<code class="code">&message</code> conditions and one <code class="code">&assertion</code> condition.
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</p>
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<p>The record type predicates and field accessors described below can
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operate on either simple or compound conditions. In the latter case,
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the predicate returns <code class="code">#t</code> if the compound condition contains a
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component simple condition of the appropriate type; the field accessors
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return the requisite fields from the first component simple condition
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found to be of the appropriate type.
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</p>
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<p>Guile’s R6RS layer uses core exception types from the <code class="code">(ice-9
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exceptions)</code> module as the basis for its R6RS condition system. Guile
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prefers to use the term “exception object” and “exception type”
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rather than “condition” or “condition type”, but that’s just a
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naming difference. Guile also has different names for the types in the
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condition hierarchy. See <a class="xref" href="Exception-Objects.html">Exception Objects</a>, for full details.
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</p>
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<p>This library is quite similar to the SRFI-35 conditions module
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(see <a class="pxref" href="SRFI_002d35.html">SRFI-35 - Conditions</a>). Among other minor differences, the <code class="code">(rnrs
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conditions)</code> library features slightly different semantics around
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condition field accessors, and comes with a larger number of pre-defined
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condition types. The two APIs are compatible; the <code class="code">condition?</code>
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predicate from one API will return <code class="code">#t</code> when applied to a condition
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object created in the other. of the condition types are the same,
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also.
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</p>
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<dl class="first-deffn">
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<dt class="deffn" id="index-_0026condition"><span class="category-def">Condition Type: </span><span><strong class="def-name">&condition</strong><a class="copiable-link" href="#index-_0026condition"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-condition_003f"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">condition?</strong> <var class="def-var-arguments">obj</var><a class="copiable-link" href="#index-condition_003f"> ¶</a></span></dt>
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<dd><p>The base record type for conditions. Known as <code class="code">&exception</code> in core
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Guile.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-condition-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">condition</strong> <var class="def-var-arguments">condition1 ...</var><a class="copiable-link" href="#index-condition-1"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-simple_002dconditions"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">simple-conditions</strong> <var class="def-var-arguments">condition</var><a class="copiable-link" href="#index-simple_002dconditions"> ¶</a></span></dt>
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<dd><p>The <code class="code">condition</code> procedure creates a new compound condition out of
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its condition arguments, flattening any specified compound conditions
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into their component simple conditions as described above.
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</p>
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<p><code class="code">simple-conditions</code> returns a list of the component simple
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conditions of the compound condition <code class="code">condition</code>, in the order in
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which they were specified at construction time.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-condition_002dpredicate"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">condition-predicate</strong> <var class="def-var-arguments">rtd</var><a class="copiable-link" href="#index-condition_002dpredicate"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-condition_002daccessor"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">condition-accessor</strong> <var class="def-var-arguments">rtd proc</var><a class="copiable-link" href="#index-condition_002daccessor"> ¶</a></span></dt>
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<dd><p>These procedures return condition predicate and accessor procedures for
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the specified condition record type <var class="var">rtd</var>.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-define_002dcondition_002dtype-1"><span class="category-def">Scheme Syntax: </span><span><strong class="def-name">define-condition-type</strong> <var class="def-var-arguments">condition-type supertype constructor predicate field-spec ...</var><a class="copiable-link" href="#index-define_002dcondition_002dtype-1"> ¶</a></span></dt>
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<dd><p>Evaluates to a new record type definition for a condition type with the
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name <var class="var">condition-type</var> that has the condition type <var class="var">supertype</var> as
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its parent. A default constructor, which binds its arguments to the
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fields of this type and its parent types, will be bound to the
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identifier <var class="var">constructor</var>; a condition predicate will be bound to
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<var class="var">predicate</var>. The fields of the new type, which are immutable, are
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specified by the <var class="var">field-spec</var>s, each of which must be of the form:
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</p><div class="example lisp">
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<pre class="lisp-preformatted">(field accessor)
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</pre></div>
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<p>where <var class="var">field</var> gives the name of the field and <var class="var">accessor</var> gives
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the name for a binding to an accessor procedure created for this field.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-_0026message"><span class="category-def">Condition Type: </span><span><strong class="def-name">&message</strong><a class="copiable-link" href="#index-_0026message"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-make_002dmessage_002dcondition"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">make-message-condition</strong> <var class="def-var-arguments">message</var><a class="copiable-link" href="#index-make_002dmessage_002dcondition"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-message_002dcondition_003f-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">message-condition?</strong> <var class="def-var-arguments">obj</var><a class="copiable-link" href="#index-message_002dcondition_003f-1"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-condition_002dmessage-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">condition-message</strong> <var class="def-var-arguments">condition</var><a class="copiable-link" href="#index-condition_002dmessage-1"> ¶</a></span></dt>
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<dd><p>A type that includes a message describing the condition that occurred.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-_0026warning"><span class="category-def">Condition Type: </span><span><strong class="def-name">&warning</strong><a class="copiable-link" href="#index-_0026warning"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-make_002dwarning-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">make-warning</strong><a class="copiable-link" href="#index-make_002dwarning-1"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-warning_003f-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">warning?</strong> <var class="def-var-arguments">obj</var><a class="copiable-link" href="#index-warning_003f-1"> ¶</a></span></dt>
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<dd><p>A base type for representing non-fatal conditions during execution.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-_0026serious"><span class="category-def">Condition Type: </span><span><strong class="def-name">&serious</strong><a class="copiable-link" href="#index-_0026serious"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-make_002dserious_002dcondition"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">make-serious-condition</strong><a class="copiable-link" href="#index-make_002dserious_002dcondition"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-serious_002dcondition_003f-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">serious-condition?</strong> <var class="def-var-arguments">obj</var><a class="copiable-link" href="#index-serious_002dcondition_003f-1"> ¶</a></span></dt>
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<dd><p>A base type for conditions representing errors serious enough that
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cannot be ignored. Known as <code class="code">&error</code> in core Guile.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-_0026error"><span class="category-def">Condition Type: </span><span><strong class="def-name">&error</strong><a class="copiable-link" href="#index-_0026error"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-make_002derror-1"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">make-error</strong><a class="copiable-link" href="#index-make_002derror-1"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-error_003f-2"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">error?</strong> <var class="def-var-arguments">obj</var><a class="copiable-link" href="#index-error_003f-2"> ¶</a></span></dt>
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<dd><p>A base type for conditions representing errors. Known as
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<code class="code">&external-error</code> in core Guile.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-_0026violation"><span class="category-def">Condition Type: </span><span><strong class="def-name">&violation</strong><a class="copiable-link" href="#index-_0026violation"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-make_002dviolation"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">make-violation</strong><a class="copiable-link" href="#index-make_002dviolation"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-violation_003f"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">violation?</strong><a class="copiable-link" href="#index-violation_003f"> ¶</a></span></dt>
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<dd><p>A subtype of <code class="code">&serious</code> that can be used to represent violations of
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a language or library standard. Known as <code class="code">&programming-error</code> in
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core Guile.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-_0026assertion"><span class="category-def">Condition Type: </span><span><strong class="def-name">&assertion</strong><a class="copiable-link" href="#index-_0026assertion"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-make_002dassertion_002dviolation"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">make-assertion-violation</strong><a class="copiable-link" href="#index-make_002dassertion_002dviolation"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-assertion_002dviolation_003f"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">assertion-violation?</strong> <var class="def-var-arguments">obj</var><a class="copiable-link" href="#index-assertion_002dviolation_003f"> ¶</a></span></dt>
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<dd><p>A subtype of <code class="code">&violation</code> that indicates an invalid call to a
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procedure. Known as <code class="code">&assertion-failure</code> in core Guile.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-_0026irritants"><span class="category-def">Condition Type: </span><span><strong class="def-name">&irritants</strong><a class="copiable-link" href="#index-_0026irritants"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-make_002dirritants_002dcondition"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">make-irritants-condition</strong> <var class="def-var-arguments">irritants</var><a class="copiable-link" href="#index-make_002dirritants_002dcondition"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-irritants_002dcondition_003f"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">irritants-condition?</strong> <var class="def-var-arguments">obj</var><a class="copiable-link" href="#index-irritants_002dcondition_003f"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-condition_002dirritants"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">condition-irritants</strong> <var class="def-var-arguments">condition</var><a class="copiable-link" href="#index-condition_002dirritants"> ¶</a></span></dt>
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<dd><p>A base type used for storing information about the causes of another
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condition in a compound condition.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-_0026who"><span class="category-def">Condition Type: </span><span><strong class="def-name">&who</strong><a class="copiable-link" href="#index-_0026who"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-make_002dwho_002dcondition"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">make-who-condition</strong> <var class="def-var-arguments">who</var><a class="copiable-link" href="#index-make_002dwho_002dcondition"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-who_002dcondition_003f"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">who-condition?</strong> <var class="def-var-arguments">obj</var><a class="copiable-link" href="#index-who_002dcondition_003f"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-condition_002dwho"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">condition-who</strong> <var class="def-var-arguments">condition</var><a class="copiable-link" href="#index-condition_002dwho"> ¶</a></span></dt>
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<dd><p>A base type used for storing the identity, a string or symbol, of the
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entity responsible for another condition in a compound condition.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-_0026non_002dcontinuable"><span class="category-def">Condition Type: </span><span><strong class="def-name">&non-continuable</strong><a class="copiable-link" href="#index-_0026non_002dcontinuable"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-make_002dnon_002dcontinuable_002dviolation"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">make-non-continuable-violation</strong><a class="copiable-link" href="#index-make_002dnon_002dcontinuable_002dviolation"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-non_002dcontinuable_002dviolation_003f"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">non-continuable-violation?</strong> <var class="def-var-arguments">obj</var><a class="copiable-link" href="#index-non_002dcontinuable_002dviolation_003f"> ¶</a></span></dt>
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<dd><p>A subtype of <code class="code">&violation</code> used to indicate that an exception
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handler invoked by <code class="code">raise</code> has returned locally.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-_0026implementation_002drestriction"><span class="category-def">Condition Type: </span><span><strong class="def-name">&implementation-restriction</strong><a class="copiable-link" href="#index-_0026implementation_002drestriction"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-make_002dimplementation_002drestriction_002dviolation"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">make-implementation-restriction-violation</strong><a class="copiable-link" href="#index-make_002dimplementation_002drestriction_002dviolation"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-implementation_002drestriction_002dviolation_003f"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">implementation-restriction-violation?</strong> <var class="def-var-arguments">obj</var><a class="copiable-link" href="#index-implementation_002drestriction_002dviolation_003f"> ¶</a></span></dt>
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<dd><p>A subtype of <code class="code">&violation</code> used to indicate a violation of an
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implementation restriction.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-_0026lexical"><span class="category-def">Condition Type: </span><span><strong class="def-name">&lexical</strong><a class="copiable-link" href="#index-_0026lexical"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-make_002dlexical_002dviolation"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">make-lexical-violation</strong><a class="copiable-link" href="#index-make_002dlexical_002dviolation"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-lexical_002dviolation_003f"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">lexical-violation?</strong> <var class="def-var-arguments">obj</var><a class="copiable-link" href="#index-lexical_002dviolation_003f"> ¶</a></span></dt>
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<dd><p>A subtype of <code class="code">&violation</code> used to indicate a syntax violation at
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the level of the datum syntax.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-_0026syntax"><span class="category-def">Condition Type: </span><span><strong class="def-name">&syntax</strong><a class="copiable-link" href="#index-_0026syntax"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-make_002dsyntax_002dviolation"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">make-syntax-violation</strong> <var class="def-var-arguments">form subform</var><a class="copiable-link" href="#index-make_002dsyntax_002dviolation"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-syntax_002dviolation_003f"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">syntax-violation?</strong> <var class="def-var-arguments">obj</var><a class="copiable-link" href="#index-syntax_002dviolation_003f"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-syntax_002dviolation_002dform"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">syntax-violation-form</strong> <var class="def-var-arguments">condition</var><a class="copiable-link" href="#index-syntax_002dviolation_002dform"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-syntax_002dviolation_002dsubform"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">syntax-violation-subform</strong> <var class="def-var-arguments">condition</var><a class="copiable-link" href="#index-syntax_002dviolation_002dsubform"> ¶</a></span></dt>
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<dd><p>A subtype of <code class="code">&violation</code> that indicates a syntax violation. The
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<var class="var">form</var> and <var class="var">subform</var> fields, which must be datum values,
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indicate the syntactic form responsible for the condition.
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</p></dd></dl>
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<dl class="first-deffn">
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<dt class="deffn" id="index-_0026undefined"><span class="category-def">Condition Type: </span><span><strong class="def-name">&undefined</strong><a class="copiable-link" href="#index-_0026undefined"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-make_002dundefined_002dviolation"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">make-undefined-violation</strong><a class="copiable-link" href="#index-make_002dundefined_002dviolation"> ¶</a></span></dt>
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<dt class="deffnx def-cmd-deffn" id="index-undefined_002dviolation_003f"><span class="category-def">Scheme Procedure: </span><span><strong class="def-name">undefined-violation?</strong> <var class="def-var-arguments">obj</var><a class="copiable-link" href="#index-undefined_002dviolation_003f"> ¶</a></span></dt>
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<dd><p>A subtype of <code class="code">&violation</code> that indicates a reference to an unbound
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identifier. Known as <code class="code">&undefined-variable</code> in core Guile.
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</p></dd></dl>
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