diff options
Diffstat (limited to 'lib/stdlib/doc/src/erl_eval.xml')
| -rw-r--r-- | lib/stdlib/doc/src/erl_eval.xml | 153 |
1 files changed, 102 insertions, 51 deletions
diff --git a/lib/stdlib/doc/src/erl_eval.xml b/lib/stdlib/doc/src/erl_eval.xml index 62af23c5eb..d0622594d9 100644 --- a/lib/stdlib/doc/src/erl_eval.xml +++ b/lib/stdlib/doc/src/erl_eval.xml @@ -4,7 +4,7 @@ <erlref> <header> <copyright> - <year>1996</year><year>2009</year> + <year>1996</year><year>2011</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> @@ -36,63 +36,108 @@ <description> <p>This module provides an interpreter for Erlang expressions. The expressions are in the abstract syntax as returned by - <c>erl_parse</c>, the Erlang parser, or a call to - <c>io:parse_erl_exprs/2</c>.</p> + <seealso marker="erl_parse"><c>erl_parse</c></seealso>, + the Erlang parser, or <seealso marker="io"> + <c>io</c></seealso>.</p> </description> + <datatypes> + <datatype> + <name name="bindings"/> + </datatype> + <datatype> + <name name="binding_struct"/> + <desc><p>A binding structure.</p></desc> + </datatype> + <datatype> + <name name="expression"/> + </datatype> + <datatype> + <name name="expressions"/> + <desc><p>As returned by <seealso marker="erl_parse#parse_exprs/1"> + <c>erl_parse:parse_exprs/1</c></seealso> or + <seealso marker="io#parse_erl_exprs/2"> + <c>io:parse_erl_exprs/2</c></seealso>.</p></desc> + </datatype> + <datatype> + <name name="expression_list"/> + </datatype> + <datatype> + <name name="func_spec"/> + </datatype> + <datatype> + <name name="lfun_eval_handler"/> + </datatype> + <datatype> + <name name="lfun_value_handler"/> + </datatype> + <datatype> + <name name="local_function_handler"/> + <desc><p>Further described + <seealso marker="#local_function_handler">below.</seealso></p> + </desc> + </datatype> + <datatype> + <name name="name"/> + </datatype> + <datatype> + <name name="nlfun_handler"/> + </datatype> + <datatype> + <name name="non_local_function_handler"/> + <desc><p>Further described + <seealso marker="#non_local_function_handler">below.</seealso></p> + </desc> + </datatype> + <datatype> + <name name="value"/> + </datatype> + </datatypes> <funcs> <func> - <name>exprs(Expressions, Bindings) -> {value, Value, NewBindings}</name> - <name>exprs(Expressions, Bindings, LocalFunctionHandler) -> {value, Value, NewBindings}</name> - <name>exprs(Expressions, Bindings, LocalFunctionHandler, NonlocalFunctionHandler) -> {value, Value, NewBindings}</name> + <name name="exprs" arity="2"/> + <name name="exprs" arity="3"/> + <name name="exprs" arity="4"/> <fsummary>Evaluate expressions</fsummary> - <type> - <v>Expressions = as returned by erl_parse or io:parse_erl_exprs/2</v> - <v>Bindings = as returned by bindings/1</v> - <v>LocalFunctionHandler = {value, Func} | {eval, Func} | none</v> - <v>NonlocalFunctionHandler = {value, Func} | none</v> - </type> <desc> - <p>Evaluates <c>Expressions</c> with the set of bindings - <c>Bindings</c>, where <c>Expressions</c> is a sequence of + <p>Evaluates <c><anno>Expressions</anno></c> with the set of bindings + <c><anno>Bindings</anno></c>, where <c><anno>Expressions</anno></c> + is a sequence of expressions (in abstract syntax) of a type which may be - returned by <c>io:parse_erl_exprs/2</c>. See below for an + returned by <seealso marker="io#parse_erl_exprs/2"> + <c>io:parse_erl_exprs/2</c></seealso>. See below for an explanation of how and when to use the arguments - <c>LocalFunctionHandler</c> and <c>NonlocalFunctionHandler</c>. + <c><anno>LocalFunctionHandler</anno></c> and + <c><anno>NonLocalFunctionHandler</anno></c>. </p> - <p>Returns <c>{value, Value, NewBindings}</c></p> + <p>Returns <c>{value, <anno>Value</anno>, <anno>NewBindings</anno>}</c> + </p> </desc> </func> <func> - <name>expr(Expression, Bindings) -> { value, Value, NewBindings }</name> - <name>expr(Expression, Bindings, LocalFunctionHandler) -> { value, Value, NewBindings }</name> - <name>expr(Expression, Bindings, LocalFunctionHandler, NonlocalFunctionHandler) -> { value, Value, NewBindings }</name> - <name>expr(Expression, Bindings, LocalFunctionHandler, NonlocalFunctionHandler, ReturnFormat) -> { value, Value, NewBindings } | Value</name> + <name name="expr" arity="2"/> + <name name="expr" arity="3"/> + <name name="expr" arity="4"/> + <name name="expr" arity="5"/> <fsummary>Evaluate expression</fsummary> - <type> - <v>Expression = as returned by io:parse_erl_form/2, for example</v> - <v>Bindings = as returned by bindings/1</v> - <v>LocalFunctionHandler = {value, Func} | {eval, Func} | none</v> - <v>NonlocalFunctionHandler = {value, Func} | none</v> - <v>ReturnFormat = value | none</v> - </type> <desc> - <p>Evaluates <c>Expression</c> with the set of bindings - <c>Bindings</c>. <c>Expression</c> is an expression (in - abstract syntax) of a type which may be returned by - <c>io:parse_erl_form/2</c>. See below for an explanation of + <p>Evaluates <c><anno>Expression</anno></c> with the set of bindings + <c><anno>Bindings</anno></c>. <c><anno>Expression</anno></c> + is an expression in + abstract syntax. See below for an explanation of how and when to use the arguments - <c>LocalFunctionHandler</c> and - <c>NonlocalFunctionHandler</c>. + <c><anno>LocalFunctionHandler</anno></c> and + <c><anno>NonLocalFunctionHandler</anno></c>. </p> - <p>Returns <c>{value, Value, NewBindings}</c> by default. But - if the <c>ReturnFormat</c> is <c>value</c> only the <c>Value</c> - is returned.</p> + <p>Returns <c>{value, <anno>Value</anno>, + <anno>NewBindings</anno>}</c> by default. But if the + <c><anno>ReturnFormat</anno></c> is <c>value</c> only + the <c><anno>Value</anno></c> is returned.</p> </desc> </func> <func> - <name>expr_list(ExpressionList, Bindings) -> {ValueList, NewBindings}</name> - <name>expr_list(ExpressionList, Bindings, LocalFunctionHandler) -> {ValueList, NewBindings}</name> - <name>expr_list(ExpressionList, Bindings, LocalFunctionHandler, NonlocalFunctionHandler) -> {ValueList, NewBindings}</name> + <name name="expr_list" arity="2"/> + <name name="expr_list" arity="3"/> + <name name="expr_list" arity="4"/> <fsummary>Evaluate a list of expressions</fsummary> <desc> <p>Evaluates a list of expressions in parallel, using the same @@ -100,18 +145,19 @@ merge the bindings returned from each evaluation. This function is useful in the <c>LocalFunctionHandler</c>. See below. </p> - <p>Returns <c>{ValueList, NewBindings}</c>.</p> + <p>Returns <c>{<anno>ValueList</anno>, <anno>NewBindings</anno>}</c>. + </p> </desc> </func> <func> - <name>new_bindings() -> BindingStruct</name> + <name name="new_bindings" arity="0"/> <fsummary>Return a bindings structure</fsummary> <desc> <p>Returns an empty binding structure.</p> </desc> </func> <func> - <name>bindings(BindingStruct) -> Bindings</name> + <name name="bindings" arity="1"/> <fsummary>Return bindings</fsummary> <desc> <p>Returns the list of bindings contained in the binding @@ -119,25 +165,28 @@ </desc> </func> <func> - <name>binding(Name, BindingStruct) -> Binding</name> + <name name="binding" arity="2"/> <fsummary>Return bindings</fsummary> <desc> - <p>Returns the binding of <c>Name</c> in <c>BindingStruct</c>.</p> + <p>Returns the binding of <c><anno>Name</anno></c> + in <c><anno>BindingStruct</anno></c>.</p> </desc> </func> <func> - <name>add_binding(Name, Value, Bindings) -> BindingStruct</name> + <name name="add_binding" arity="3"/> <fsummary>Add a binding</fsummary> <desc> - <p>Adds the binding <c>Name = Value</c> to <c>Bindings</c>. + <p>Adds the binding <c><anno>Name</anno> = <anno>Value</anno></c> + to <c><anno>BindingStruct</anno></c>. Returns an updated binding structure.</p> </desc> </func> <func> - <name>del_binding(Name, Bindings) -> BindingStruct</name> + <name name="del_binding" arity="2"/> <fsummary>Delete a binding</fsummary> <desc> - <p>Removes the binding of <c>Name</c> in <c>Bindings</c>. + <p>Removes the binding of <c><anno>Name</anno></c> + in <c><anno>BindingStruct</anno></c>. Returns an updated binding structure.</p> </desc> </func> @@ -145,7 +194,8 @@ <section> <title>Local Function Handler</title> - <p>During evaluation of a function, no calls can be made to local + <p><marker id="local_function_handler"></marker> + During evaluation of a function, no calls can be made to local functions. An undefined function error would be generated. However, the optional argument <c>LocalFunctionHandler</c> may be used to define a function @@ -191,7 +241,8 @@ Func(Name, Arguments, Bindings) </code> <section> <title>Non-local Function Handler</title> - <p>The optional argument <c>NonlocalFunctionHandler</c> may be + <p><marker id="non_local_function_handler"></marker> + The optional argument <c>NonlocalFunctionHandler</c> may be used to define a function which is called in the following cases: a functional object (fun) is called; a built-in function is called; a function is called using the M:F syntax, where M |