--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hpgl_parser.py Fri Dec 21 23:51:36 2007 +0100
@@ -0,0 +1,408 @@
+# -*- coding: utf-8 -*-
+
+import re
+import numpy
+
+vsplitter = re.compile('[ ,]')
+vextractor = re.compile('(?P<value>[^;\n\r\aA-DF-Za-df-z]*?)(?P<terminator>[;\n\r\a]+)', re.S+re.M)
+
+class HPGLParser(object):
+ def __init__(self, data):
+ self.data = data
+ self.idx = 0
+ self.str_terminator = chr(0x03)
+
+ self.IN()
+
+ while self.idx<len(data):
+ while data[self.idx] in [';','\n','\r', '\a', ' ']:
+ self.idx += 1
+ if data[self.idx] == chr(0x03):
+ self.ESC()
+ else:
+ cmd = data[self.idx: self.idx+2]
+ self.idx += 2
+ getattr(self, cmd)()
+ while self.idx<len(data) and data[self.idx] in [';','\n','\r', '\a', ' ']:
+ self.idx += 1
+
+ def user_to_abs(self, pos):
+ """
+ converts a position (x, y) given in user units to absolute
+ units
+ """
+ return pos #TODO
+
+ def extract_value(self, raw=False):
+ m = vextractor.match(self.data[self.idx:])
+ if m:
+ val = m.group("value")
+ self.idx = self.idx + len(val) + len(m.group("terminator"))
+ val = vsplitter.split(val)
+ if not raw:
+ val = [eval(x) for x in val if x.strip()]
+ return val
+ return []
+
+ def extract_string(self):
+ idx2 = self.data.find(self.str_terminator, self.idx)
+ val = self.data[self.idx: idx2]
+ self.idx = idx2+1
+ return val
+
+ def polyline(self, values):
+ if (len(values)%2) == 1:
+ # this is a syntax error in the HPGL data
+ values = values[:-1]
+ values = numpy.array(values).reshape(-1, 2)
+ # TODO use scaling
+ # do plots
+ values = numpy.r_[[self.pos], values] #add self.pos as 1st value
+ if self.plot_mode == 'relative':
+ values = values.cumsum(axis=0)
+ if self.symbol_mode:
+ self.plot_symbols(values[1:])
+ if self.pen_state == "down":
+ self.plot_lines(values)
+ self.pos = values[-1]
+
+ def get_window_for_paper(self):
+ return 0,100,0,100
+ def get_scaling_points_for_paper(self):
+ return 0,100,0,100
+
+ # effective plot methods; to be defined in subclasses (backends)
+ def plot_symbols(self, points):
+ pass
+ def plot_lines(self, points):
+ pass
+
+ # HPGL-related methods
+ def ESC(self):
+ print "ESC"
+ self.idx += 1
+
+ def OE(self):
+ """ Output Error """
+ pass
+
+ def EC(self):
+ """? what's this """
+ values = self.extract_value()
+
+ def OO(self):
+ """idem"""
+ pass
+
+ def OP(self):
+ """idem"""
+ pass
+
+ def VS(self):
+ """idem"""
+ pass
+
+
+ def DF(self):
+ """ Default """
+ self.pen = 0
+ self.pos = 0,0
+ self.char_set = "std"
+ self.plot_mode = 'absolute'
+ self.char_direction = 1,0
+ self.line_type = 0 # 'solid'
+ self.pattern_len = 4 #percentage
+ self.window = self.get_window_for_paper()
+ self.char_size = 0.75, 1.5 #percentages
+ self.symbol_mode = False
+ self.tick_len = 0.5, 0.5 # %
+ self.std_char_set = 0
+ self.alt_char_set = 0
+ self.selected_char_set = 0
+ self.char_slant = 0 # degrees
+ self.scale = None
+ self.str_terminator = chr(0x03)
+ self.chord_ang = 5 #degrees
+ self.fill_type = 'bidirectionnal', 1
+ self.fill_distance = 1 # %
+ self.fill_slant = 0 # degrees
+ self.pen_thickness = 0.3 # mm
+
+ def IN(self):
+ """ Initialize """
+ self.DF()
+ self.pen_state = "up"
+ self.rotation = 0 #degrees
+ self.scaling_points = self.get_scaling_points_for_paper()
+
+ def IP(self):
+ """ Input Scale Point"""
+ values = self.extract_value()
+ if len(values) == 0:
+ self.scaling_points = self.get_scaling_points_for_paper()
+ elif len(values) == 2:
+ p1x, p1y, p2x, p2y = self.scaling_points
+ dx, dy = p2x-p1x, p2y-p1y
+ x, y = values
+ self.scaling = (x, y, x+dx, y+dy)
+ elif len(values) == 4:
+ self.values = tuple(values)
+
+ def SC(self):
+ """ Scale """
+ values = self.extract_value()
+ if len(values) == 4:
+ self.scale = tuple(values)
+ else:
+ self.scale = None
+
+ def IW(self):
+ values = self.extract_value()
+ if len(values) == 0:
+ self.window = self.get_window_for_paper()
+ elif len(value) == 4:
+ self.window = tuple(values)
+
+ def RO(self):
+ values = self.extract_value()
+ if len(values) == 0:
+ self.rotation = 0
+ elif len(values) == 1:
+ self.rotation = values[0]
+
+ def PG(self):
+ pass
+
+ def PU(self):
+ """ Pen Up"""
+ self.pen_state = "up"
+ values = self.extract_value()
+ self.polyline(values)
+
+ def PD(self):
+ """ Pen Down """
+ self.pen_state = "down"
+ values = self.extract_value()
+ self.polyline(values)
+
+ def PA(self):
+ """ Plot Absolute """
+ self.plot_mode = "absolute"
+ values = self.extract_value()
+ self.polyline(values)
+
+ def PR(self):
+ """ Plot Relative """
+ self.plot_mode = "relative"
+ values = self.extract_value()
+ self.polyline(values)
+
+ def AA(self):
+ """ Arc Absolute """
+ values = self.extract_value()
+ if len(values) in [3, 4]:
+ x, y, qc = values[:3]
+ if len(values)==4:
+ qd = values[-1]
+ else:
+ qd = self.chord_ang
+ # TODO : plot arc
+ print "plotting an arc"
+ def AR(self):
+ """ Arc Relative """
+ values = self.extract_value()
+ # TODO
+
+ def CI(self):
+ """ Circle Plot"""
+ values = self.extract_value()
+ # TODO
+
+ def EA(self):
+ """Edge Rectangle Absolute"""
+ values = self.extract_value()
+ # TODO
+
+ def ER(self):
+ """Edge Rectangle Relative"""
+ values = self.extract_value()
+ # TODO
+
+ def EW(self):
+ """ Edge Wedge """
+ values = self.extract_value()
+ # TODO
+
+ def RA(self):
+ """ Fill Rectangle Absolute """
+ values = self.extract_value()
+ # TODO
+
+ def RR(self):
+ """ Fill Rectangle Relative """
+ values = self.extract_value()
+ # TODO
+
+ def WG(self):
+ """ Fill Wedge """
+ values = self.extract_value()
+ # TODO
+
+ def FT(self):
+ """ Fill Type """
+ values = self.extract_value()
+ # TODO
+
+ def LT(self):
+ """ Line Type """
+ values = self.extract_value()
+
+ if len(values)==0:
+ self.line_type = 0 #'solid'
+ else:
+ self.line_type = values[0]
+ if len(values)>1:
+ self.pattern_len = values[1]
+
+ def PW(self):
+ """ Pen Width """
+ values = self.extract_value()
+ if len(values) == 1:
+ self.pen_thickness = values[0]
+
+ def SM(self):
+ """ Symbol Mode """
+ values = self.extract_value()
+ if len(values) == 0:
+ self.symbol_mode = False
+ elif len(values) == 1:
+ self.symbol_mode = values[0]
+
+ def SP(self):
+ """ Select Pen """
+ values = self.extract_value()
+ if len(values) == 1:
+ self.pen = values[0]
+
+ def TL(self):
+ """ Tick Len """
+ values = self.extract_value()
+ # TODO
+
+ def XT(self):
+ """ X-axis Tick """
+ # TODO
+ print "X ticks"
+
+ def YT(self):
+ """ X-axis Tick """
+ # TODO
+ print "Y ticks"
+
+ def PT(self):
+ """ Pen Thickness Select """
+ values = self.extract_value()
+ if len(values) == 0:
+ self.pen_thickness = 0.3
+ elif len(values) == 1:
+ self.pen_thickness = values[0]
+
+ def CS(self):
+ """ Standard Character Set """
+ values = self.extract_value()
+ if len(values) == 0:
+ self.std_char_set = 0
+ elif len(values) == 1:
+ self.std_char_set = values[0]
+
+ def CA(self):
+ """ Alternate Character Set """
+ values = self.extract_value()
+ if len(values) == 0:
+ self.alt_char_set = 0
+ elif len(values) == 1:
+ self.alt_char_set = values[0]
+
+ def SS(self):
+ """ Select Standard Character Set """
+ self.char_set = "std"
+
+ def SA(self):
+ """ Select Alternate Character Set """
+ self.char_set = "alt"
+
+ def DT(self):
+ """ Define Label Terminator """
+ values = self.extract_value(raw=True)
+ if len(values) == 0:
+ self.str_terminator = chr(0x03)
+ elif len(values) == 1:
+ self.str_terminator = values[0]
+
+ def LB(self):
+ """ Character Plot """
+ values = self.extract_string()
+ # TODO
+
+ def DI(self):
+ """ Absolute Direction """
+ values = self.extract_value()
+ if len(values) == 0:
+ self.char_direction = 1.0, 0.0
+ elif len(values) == 2:
+ self.char_direction = values
+
+ def DR(self):
+ """ Relative Direction """
+ values = self.extract_value()
+ if len(values) == 0:
+ self.char_direction = 1.0, 0.0
+ elif len(values) == 2:
+ # TODO : compute as percentages
+ self.char_direction = values
+
+ def CP(self):
+ """ Character Plot """
+ values = self.extract_value()
+ # TODO
+ if len(values) == 0:
+ values = 0, -1
+ #if len(values) == 2:
+ # self.pos =
+
+ def SI(self):
+ """ Set Absolute Character Size """
+ values = self.extract_value()
+ self.char_size = "absolute"
+ if len(values) == 0:
+ self.char_width = 0.1879
+ self.char_height = 0.2690
+ elif len(values) == 2:
+ self.char_width, self.char_height = values
+
+ def SR(self):
+ """ Set Relative Character Size """
+ values = self.extract_value()
+ self.char_size = "relative"
+ if len(values) == 0:
+ self.char_width = 0.75
+ self.char_height = 1.5
+ elif len(values) == 2:
+ self.char_width, self.char_height = values
+
+ def SL(self):
+ """ Character Slant """
+ values = self.extract_value()
+ # TODO
+
+ def UC(self):
+ """ User Defined Character """
+ values = self.extract_value()
+ # TODO
+
+if __name__ == '__main__':
+ import sys
+ data = open(sys.argv[1]).read()
+
+ p = HPGLParser(data)
+ 