def ignore(tag: Optional[str] = None) -> p.Parser:
def process(element: Element) -> ast.NullStatement:
return ast.NullStatement(source=source_from_element(element))
if tag:
return p.tag(tag) ^ process
return p.any() ^ process
def phase() -> p.Parser:
phase_block = block(
value(str, 'mission') | value(cycles, 'cycles')
| value(repeat, 'repeat')
| value(ref_pass, 'ref_pass', var='reference_pass')
| value(time, 'start_time') | value(time, 'end_time') | subcycles())
process = named_block_processor('phase', phase_block, ast.Phase)
return p.tag('phase') ^ process
def if_statement(internal: p.Parser) -> p.Parser:
def process(statements: Tuple[Element, ast.Statement]) -> ast.Statement:
if_element, false_statement = statements
condition = parse_condition(if_element.attributes)
true_statement = internal(if_element.down())[0]
source = source_from_element(if_element)
return ast.If(condition=condition,
true_statement=true_statement,
false_statement=false_statement,
source=source)
return p.tag('if') + p.opt(
elseif_statement(internal) | else_statement(internal)) ^ process
def alias() -> p.Parser:
def process(element: Element) -> ast.Alias:
try:
alias = element.attributes['name']
except KeyError:
raise error_at(element)("'name' attribute missing from <alias>")
variables = element.text.split() if element.text else []
if not variables:
raise error_at(element)('<alias> cannot be empty')
condition = parse_condition(element.attributes)
action = parse_action(element)
source = source_from_element(element)
return ast.Alias(alias, variables, condition, action, source=source)
return p.tag('alias') ^ process
def variable() -> p.Parser:
variable_block = block(
value(str, 'long_name', var='name') | value(str, 'standard_name')
| value(str, 'source') | value(str, 'comment') | value(unit, 'units')
| value(list_of(str), 'flag_values')
| value(list_of(str), 'flag_masks') | value(range_of(float), 'limits')
| value(range_of(float), 'plot_range') |
# used by rads for database generation, has no effect on end users
ignore('parameters') | ignore('data') | # TODO: Complex field.
value(list_of(str), 'quality_flag') |
# not currently used
value(int, 'dimensions') | ignore('format') | ignore('compress')
| ignore('default'))
process = named_block_processor('var', variable_block, ast.Variable)
return p.tag('var') ^ process
def elseif_statement(internal: p.Parser) -> p.Parser:
def process(statements: Iterable[Any]) -> ast.Statement:
elseif_element, false_statement = statements
condition = parse_condition(elseif_element.attributes)
true_statement = internal(elseif_element.down())[0]
source = source_from_element(elseif_element)
return ast.If(condition,
true_statement,
false_statement,
source=source)
return p.Apply(
p.tag('elseif') + p.opt(
p.lazy(lambda: elseif_statement(internal))
| else_statement(internal)), process)
def value(parser: Callable[[str], Any] = nop,
tag: Optional[str] = None,
var: Optional[str] = None) -> p.Parser:
def process(element: Element) -> ast.Assignment:
var_ = var if var else element.tag
condition = parse_condition(element.attributes)
action = parse_action(element)
text = element.text if element.text else ''
source = source_from_element(element)
try:
return ast.Assignment(name=var_,
value=parser(text),
condition=condition,
action=action,
source=source)
except (ValueError, TypeError) as err:
raise error_at(element)(str(err))
if tag:
return p.tag(tag) ^ process
return p.any() ^ process
def subcycles() -> p.Parser:
def process(element: Element) -> ast.Statement:
start: Optional[int]
condition = parse_condition(element.attributes)
action = parse_action(element)
try:
start = int(element.attributes['start'])
except KeyError:
start = None
except ValueError as err:
raise error_at(element)(str(err))
text = element.text if element.text else ''
lengths = [int(s) for s in text.split()]
source = source_from_element(element)
return ast.Assignment(name='subcycles',
value=SubCycles(lengths, start=start),
condition=condition,
action=action,
source=source)
return p.tag('subcycles') ^ process
def satellites() -> p.Parser:
def process(element: Element) -> ast.Satellites:
source = source_from_element(element)
if not element.text:
return ast.Satellites(source=source)
satellites_ = []
for num, line in enumerate(element.text.strip().splitlines()):
line = line.strip()
if line:
id_source = ast.Source(line=element.opening_line + num + 1,
file=element.file)
try:
id_, id3, *names = line.split()
except ValueError:
raise p.GlobalParseFailure(
id_source.file, id_source.line,
f"missing 3 character ID for satellite '{id_}'")
satellites_.append(
ast.SatelliteID(id_, id3, set(names), source=id_source))
return ast.Satellites(*satellites_, source=source)
return p.tag('satellites') ^ process
def preparse(root: Element) -> ast.Statement:
def process(elements: Sequence[Element]) -> Element:
return elements[-1]
parser = p.until(p.tag('satellites')) + satellites() ^ process
return cast(ast.Statement, parser(root.down())[0])
def else_statement(internal: p.Parser) -> p.Parser:
def process(element: Element) -> Any:
return internal(element.down())[0]
return p.tag('else') ^ process
