#include <D4FunctionEvaluator.h>
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| static void | error (const libdap::location &l, const std::string &m) |
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Driver for the DAP4 Functional expression parser.
Definition at line 48 of file D4FunctionEvaluator.h.
◆ D4FunctionEvaluator() [1/2]
| libdap::D4FunctionEvaluator::D4FunctionEvaluator |
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◆ D4FunctionEvaluator() [2/2]
◆ ~D4FunctionEvaluator()
| virtual libdap::D4FunctionEvaluator::~D4FunctionEvaluator |
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◆ dmr()
| DMR * libdap::D4FunctionEvaluator::dmr |
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const |
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◆ error()
| void libdap::D4FunctionEvaluator::error |
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const libdap::location & | l, |
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const std::string & | m ) |
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◆ eval()
| void libdap::D4FunctionEvaluator::eval |
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DMR * | function_result | ) |
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Evaluate the recently parsed function expression and put the resulting rvalues (which return values packaged in libdap BaseType objects) into the top-level Group of the DMR passed as a param here.
- Note
- The DMR passed to this method can (and usually will) be different from the DMR passed to the D4FunctionEvaluator constructor. That DMR is the 'source dataset' for values of variables used by the functions. It is not generally where the results of evaluating the functions wind up. Usually, you'll want those results in their own DMR; the functions effectively make a new dataset. However, you can pass the source dataset DMR into this method and in that case the new variables will be appended to its root Group.
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This code is really just a place to package results. The actual evaluation happens in the D4RValue object when values are accessed. The parse() method here builds the list of D4RValue objects and this code accesses the values which triggers the function evaluation. Thus, if you'd like to build a system that performs lazy evaluation, you can work with the result() method from this class instead of this one.
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Calling this method will delete the D4RValueList object built by the parse() method.
- Parameters
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| dmr | Store the results here |
- Exceptions
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| Throws | Error if the evaluation fails. |
Definition at line 104 of file D4FunctionEvaluator.cc.
◆ get_arg_length_hint()
| unsigned long long libdap::D4FunctionEvaluator::get_arg_length_hint |
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◆ init_arg_list() [1/2]
template<typename T>
| vector< T > * libdap::D4FunctionEvaluator::init_arg_list |
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T | val | ) |
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◆ init_arg_list() [2/2]
template<typename t>
| std::vector< t > * libdap::D4FunctionEvaluator::init_arg_list |
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t | val | ) |
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◆ parse()
| bool libdap::D4FunctionEvaluator::parse |
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const std::string & | expr | ) |
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Parse the DAP4 function expression.
Calling this method with a DAP4 function expression builds a D4RvalueList that can then be evaluated. The list of rvalues can be accessed or evaluated (using the result() or eval() methods). Note that the result is a list of rvalues because the input can be zero or more function expressions.
- Parameters
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| expr | The function expression. |
- Returns
- True if the parse succeeded, false otherwise.
Definition at line 62 of file D4FunctionEvaluator.cc.
◆ result()
| D4RValueList * libdap::D4FunctionEvaluator::result |
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◆ set_arg_length_hint()
| void libdap::D4FunctionEvaluator::set_arg_length_hint |
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unsigned long long | alh | ) |
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◆ set_dmr()
| void libdap::D4FunctionEvaluator::set_dmr |
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DMR * | dmr | ) |
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◆ set_result()
| void libdap::D4FunctionEvaluator::set_result |
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D4RValueList * | rv_list | ) |
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◆ set_sf_list()
◆ set_trace_parsing()
| void libdap::D4FunctionEvaluator::set_trace_parsing |
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bool | tp | ) |
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◆ set_trace_scanning()
| void libdap::D4FunctionEvaluator::set_trace_scanning |
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bool | ts | ) |
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◆ sf_list()
◆ trace_parsing()
| bool libdap::D4FunctionEvaluator::trace_parsing |
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const |
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◆ trace_scanning()
| bool libdap::D4FunctionEvaluator::trace_scanning |
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const |
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◆ D4FunctionParser
| friend class D4FunctionParser |
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friend |
The documentation for this class was generated from the following files:
