"""!@package grass.temporal
Temporal raster algebra
(C) 2013 by the GRASS Development Team
This program is free software under the GNU General Public
License (>=v2). Read the file COPYING that comes with GRASS
for details.
:authors: Thomas Leppelt and Soeren Gebbert
"""
try:
import ply.yacc as yacc
except ImportError:
pass
from .temporal_raster_base_algebra import (
TemporalRasterBaseAlgebraParser,
TemporalRasterAlgebraLexer,
)
import grass.pygrass.modules as pymod
from .space_time_datasets import Raster3DDataset
[docs]class TemporalRaster3DAlgebraParser(TemporalRasterBaseAlgebraParser):
"""The temporal raster algebra class"""
def __init__(
self,
pid=None,
run=False,
debug=True,
spatial=False,
register_null=False,
dry_run=False,
nprocs=1,
):
TemporalRasterBaseAlgebraParser.__init__(
self,
pid=pid,
run=run,
debug=debug,
spatial=spatial,
register_null=register_null,
dry_run=dry_run,
nprocs=nprocs,
)
self.m_mapcalc = pymod.Module("r3.mapcalc")
self.m_mremove = pymod.Module("g.remove")
[docs] def parse(self, expression, basename=None, overwrite=False):
# Check for space time dataset type definitions from temporal algebra
l = TemporalRasterAlgebraLexer()
l.build()
l.lexer.input(expression)
while True:
tok = l.lexer.token()
if not tok:
break
if tok.type == "STVDS" or tok.type == "STRDS" or tok.type == "STR3DS":
raise SyntaxError("Syntax error near '%s'" % (tok.type))
self.lexer = TemporalRasterAlgebraLexer()
self.lexer.build()
self.parser = yacc.yacc(module=self, debug=self.debug, write_tables=False)
self.overwrite = overwrite
self.count = 0
self.stdstype = "str3ds"
self.maptype = "raster_3d"
self.mapclass = Raster3DDataset
self.basename = basename
self.expression = expression
self.parser.parse(expression)
return self.process_chain_dict
[docs] def p_statement_assign(self, t):
# The expression should always return a list of maps.
"""
statement : stds EQUALS expr
"""
TemporalRasterBaseAlgebraParser.p_statement_assign(self, t)
[docs] def p_ts_neighbor_operation(self, t):
# Examples:
# A[1,0,-1]
# B[-2]
# C[1,-2,1,3]
"""
expr : stds L_SPAREN number COMMA number COMMA number R_SPAREN
| stds L_SPAREN number R_SPAREN
| stds L_SPAREN number COMMA number COMMA number COMMA number R_SPAREN
"""
# Check input stds.
maplist = self.check_stds(t[1])
t_neighbor = 0
row_neighbor = None
col_neighbor = None
depth_neighbor = None
if len(t) == 5:
t_neighbor = t[3]
elif len(t) == 9:
row_neighbor = t[3]
col_neighbor = t[5]
depth_neighbor = t[7]
elif len(t) == 11:
t_neighbor = t[9]
row_neighbor = t[3]
col_neighbor = t[5]
depth_neighbor = t[7]
if self.run:
resultlist = []
max_index = len(maplist)
for map_i in maplist:
# Get map index and temporal extent.
map_index = maplist.index(map_i)
new_index = map_index + t_neighbor
if new_index < max_index and new_index >= 0:
map_i_t_extent = map_i.get_temporal_extent()
# Get neighboring map and set temporal extent.
map_n = maplist[new_index]
# Generate an intermediate map for the result map list.
map_new = self.generate_new_map(map_n, bool_op="and", copy=True)
map_new.set_temporal_extent(map_i_t_extent)
# Create r.mapcalc expression string for the operation.
if "cmd_list" in dir(map_new) and len(t) == 5:
cmdstring = "%s" % (map_new.cmd_list)
elif "cmd_list" not in dir(map_new) and len(t) == 5:
cmdstring = "%s" % (map_n.get_id())
elif "cmd_list" in dir(map_new) and len(t) in (9, 11):
cmdstring = "%s[%s,%s,%s]" % (
map_new.cmd_list,
row_neighbor,
col_neighbor,
depth_neighbor,
)
elif "cmd_list" not in dir(map_new) and len(t) in (9, 11):
cmdstring = "%s[%s,%s,%s]" % (
map_n.get_id(),
row_neighbor,
col_neighbor,
depth_neighbor,
)
# Set new command list for map.
map_new.cmd_list = cmdstring
# Append map with updated command list to result list.
resultlist.append(map_new)
t[0] = resultlist
if __name__ == "__main__":
import doctest
doctest.testmod()
