[top] / zope / tal / interfaces / ITALExpressionEngine
Render-time interface provided by a TAL expression implementation.
The TAL interpreter uses this interface to TAL expression to support evaluation of the compiled expressions returned by ITALExpressionCompiler.compile().
There are no attributes or fields specified.
endScope()
Pop one scope from the stack of open scopes.
beginScope()
Push a new scope onto the stack of open scopes.
setGlobal(name, value)
Set a global variable.
The variable will be named name
and have the value value
.
createErrorInfo(exception, .2)
Returns an ITALExpressionErrorInfo object.
The returned object is used to provide information about the error condition for the on-error handler.
evaluate(compiled_expression)
Evaluate an arbitrary expression.
No constraints are imposed on the return value.
setRepeat(name, compiled_expression)
Start a repetition, returning an ITALIterator.
The engine is expected to add the a value (typically the returned iterator) for the name to the variable namespace.
setSourceFile(filename)
Inform the engine of the name of the current source file.
This is used to allow the evaluation engine to report execution errors so that site developers can more easily locate the offending expression.
evaluateValue(compiled_expression)
Evaluate an arbitrary expression.
No constraints are imposed on the return value.
getValue(name, default=None)
Get a variable by name.
If the variable does not exist, return default.
evaluateText(compiled_expression)
Evaluate an expression that must return text.
The returned text should be suitable for direct inclusion in the output: any HTML or XML escaping or quoting is the responsibility of the expression itself.
If the expression evaluates to None, then that is returned. It
represents nothing
in TALES.
If the expression evaluates to what getDefault() of this interface
returns, by comparison using is
, then that is returned. It
represents default
in TALES.
getDefault()
Return the value of the default
TAL expression.
Checking a value for a match with default
should be done
using the is
operator in Python.
evaluateCode(lang, code)
Evaluates code of the given language.
Returns whatever the code outputs. This can be defined on a per-language basis. In Python this usually everything the print statement will return.
evaluateBoolean(compiled_expression)
Evaluate an expression that must return a Boolean value.
evaluateStructure(compiled_expression)
Evaluate an expression that must return a structured document fragment.
The result of evaluating compiled_expression
must be a
string containing a parsable HTML or XML fragment. Any TAL
markup contained in the result string will be interpreted.
setLocal(name, value)
Set a local variable in the current scope.
The variable will be named name
and have the value value
.
setPosition(.0)
Inform the engine of the current position in the source file.
This is used to allow the evaluation engine to report execution errors so that site developers can more easily locate the offending expression.
translate(msgid, domain=None, mapping=None, default=None)
See zope.i18n.interfaces.ITranslationDomain.translate
evaluateMacro(compiled_expression)
Evaluate an expression that must return a macro program.
There are no specific adapters registered for this interface.
There are no extended adapters registered for this interface.
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