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#!/usr/bin/env python
###########################################################################
#
# xasyFile implements the loading, parsing, and saving of an xasy file.
#
#
# Author: Orest Shardt
# Created: June 29, 2007
#
############################################################################
from string import *
from xasy2asy import *
import re
class xasyParseError(Exception):
"""A parsing error"""
pass
class xasyFileError(Exception):
"""An i/o error or other error not related to parsing"""
pass
def parseFile(inFile):
"""Parse a file returning a list of xasyItems"""
lines = inFile.read()
lines = lines.splitlines()
#lines = [line for line in lines.splitlines() if not line.startswith("//")]
result = []
if lines[0] != "initXasyMode();":
raise xasyFileError("Invalid file format: First line must be \"initXasyMode();\"")
lines.pop(0)
lineCount = 2
lineNum = len(lines)
while lineNum > 0:
line = lines[0]
lines.pop(0)
if not line.isspace() and len(line)>0:
try:
#print ("Line {:d}: {:s}".format(lineCount,line))
lineResult = parseLine(line.strip(),lines)
except:
raise xasyParseError("Parsing error: line {:d} in {:s}\n{:s}".format(lineCount,inFile.name,line))
if lineResult != None:
result.append(lineResult)
#print ("\tproduced: {:s}".format(str(lineResult)))
lineCount += lineNum-len(lines)
lineNum = len(lines)
return result
transformPrefix = "xformStack"
scriptPrefix = "startScript(); {"
scriptSuffix = "} endScript();"
def extractScript(lines):
"""Find the code belonging to a script item"""
theScript = ""
line = lines.pop(0)
level = 1
while level > 0:
check = line.lstrip()
while check.endswith(scriptSuffix):
level -= 1
line = line[:len(line)-len(scriptSuffix)]
check = line.lstrip()
if check.startswith(scriptPrefix):
level += 1
theScript += line + "\n"
if level > 0:
line = lines.pop(0)
global pendingTransformsD
ts = pendingTransformsD[:]
pendingTransformsD = []
return xasyScript(None,script=theScript,transforms=ts[:])
pendingTransforms = []
pendingTransformsD = []
def addTransform(index,t,active=1):
"""Place a transform in the list of transforms, expanding the list as needed"""
while len(pendingTransformsD) < index+1:
pendingTransformsD.append(identity())
deleted = int(active==0)
pendingTransformsD[index]=asyTransform(t,deleted)
def parseIndexedTransforms(args):
"""Parse a list of indexedTransforms, adding them to the current list of transforms"""
global pendingTransformsD
pendingTransformsD = []
args = args.replace("indexedTransform","")
false = 0
tList = [eval(a) for a in ")?(".join(args.split("),(")).split("?")]
for a in tList:
addTransform(*a)
def parseTransformExpression(line):
"""Parse statements related to the xformStack
Syntax:
xformStack.push(transform)
e.g.: xformStack.push((0,0,1,0,0,1)); //the identity
xformStack.add(indexedTransform(index,transform)[,...])
e.g.: xformStack.add(indexedTransform(1,(0,0,1,0,0,1));
"""
global pendingTransforms
stackCmd = line[len(transformPrefix)+1:line.find("(")]
if line[-2:] != ");":
raise xasyParseError("Invalid syntax")
args = line[line.find("(")+1:-2]
if stackCmd == "push":
t = asyTransform(eval(args))
pendingTransforms.append(t)
elif stackCmd == "add":
parseIndexedTransforms(args)
else:
raise xasyParseError("Invalid transform stack command.")
return None
def parseLabel(line):
"""Parse an asy Label statement, returning an xasyText item"""
if not (line.startswith("Label(") and line.endswith(",align=SE)")):
raise xasyParseError("Invalid syntax")
args = line[6:-1]
loc2 = args.rfind(",align=SE")
loc1 = args.rfind(",",0,loc2-1)
loc = args.rfind(",(",0,loc1-1)
if loc < 2:
raise xasyParseError("Invalid syntax")
text = args[1:loc-1]
location = eval(args[loc+1:args.find("),",loc)+1])
pen = args[loc:loc2]
pen = pen[pen.find(",")+1:]
pen = pen[pen.find(",")+1:]
pen = pen[pen.find(",")+1:]
global pendingTransforms
return xasyText(text,location,parsePen(pen),pendingTransforms.pop())
def parseLabelCommand(line):
"""Parse a label command returning an xasyText object
Syntax:
label(Label(text,location,pen,align=SE));
e.g.: label(Label("Hello world!",(0,0),rgb(0,0,0)+0.5,align=SE));
"""
if line[-2:] != ");":
raise xasyParseError("Invalid syntax")
arguments = line[6:-2]
return parseLabel(arguments)
def parseDrawCommand(line):
"""Parse a draw command returning an xasyShape object
Syntax:
draw(path,pen);
e.g.: draw((0,0)..controls(0.33,0.33)and(0.66,0.66)..(1,1),rgb(1,0,1)+1.5);
"""
if line[-2:] != ");":
raise xasyParseError("Invalid syntax")
args = line[5:-2]
loc = args.rfind(",rgb")
path = args[:loc]
pen = args[loc+1:]
global pendingTransforms
return xasyShape(parsePathExpression(path),parsePen(pen),pendingTransforms.pop())
def parseFillCommand(line):
"""Parse a fill command returning an xasyFilledShape object
Syntax:
fill(cyclic path,pen);
e.g.: fill((0,0)..controls(0.33,0.33)and(0.66,0.66)..(1,1)..controls(0.66,0)and(0.33,0)..cycle,rgb(1,0,1)+1.5);
"""
if line[-2:] != ");":
raise xasyParseError("Invalid syntax")
args = line[5:-2]
loc = args.rfind(",rgb")
path = args[:loc]
pen = args[loc+1:]
global pendingTransforms
return xasyFilledShape(parsePathExpression(path),parsePen(pen),pendingTransforms.pop())
def parsePen(pen):
"""Parse a pen expression returning an asyPen
Syntax:
color+width[+options]
e.g.: rgb(0,0,0)+1.5+evenodd
e.g.: rgb(0,1,0)+1.23
"""
try:
tokens = pen.split("+")
color = eval(tokens[0][3:])
width = float(tokens[1])
if len(tokens)>2:
options = "+".join(tokens[2:])
else:
options = ""
return asyPen(color,width,options)
except:
raise xasyParseError("Invalid pen")
def parsePathExpression(expr):
"""Parse an asy path returning an asyPath()"""
result = asyPath()
expr = "".join(expr.split())
#print (expr)
if expr.find("controls") != -1:
#parse a path with control points
tokens = expr.split("..")
nodes = [a for a in tokens if not a.startswith("controls")]
for a in range(len(nodes)):
if nodes[a] != "cycle":
nodes[a] = eval(nodes[a])
controls = [eval(a.replace("controls", "").split("and")) for a in tokens if a.startswith("controls")]
result.initFromControls(nodes, controls)
else:
#parse a path without control points
tokens = re.split(r"(::|--|\.\.)",expr)
linkSet = re.findall("::|--|\.\.",expr)
nodeSet = [a for a in tokens if not re.match(r"::|--|\.\.",a)]
#print (nodeSet)
for a in range(len(nodeSet)):
if nodeSet[a] != "cycle":
nodeSet[a] = eval(nodeSet[a])
#print (nodeSet)
result.initFromNodeList(nodeSet, linkSet)
return result
def takeUntilSemicolon(line,lines):
"""Read and concatenate lines until the collected lines end with a semicolon"""
data = line
while not data.endswith(";"):
newline = lines.pop(0)
data += newline
return data
def parseLine(line,lines):
"""Parse a line of the file"""
if len(line)==0 or line.isspace() or line.startswith("//"):
return None
elif line.startswith(scriptPrefix):
return extractScript(lines)
elif line.startswith(transformPrefix):
return parseTransformExpression(takeUntilSemicolon(line,lines))
elif line.startswith("label("):
return parseLabelCommand(takeUntilSemicolon(line,lines))
elif line.startswith("draw("):
return parseDrawCommand(takeUntilSemicolon(line,lines))
elif line.startswith("fill("):
return parseFillCommand(takeUntilSemicolon(line,lines))
elif line.startswith("exitXasyMode();"):
return None
raise Exception("Could not parse the line")
fileHeader = """initXasyMode();
// This file was generated by xasy. It may be edited manually, however, a strict
// syntax must be followed. It is advised that manually scripted items be added
// in the form of a script either by using xasy or by mimicking the format of an
// xasy-generated script item.
// Please consult the documentation or the examples provided for details.
"""
fileFooter = """// This is the end of the file
exitXasyMode();
"""
def saveFile(file,xasyItems):
"""Write a list of xasyItems to a file"""
file.write(fileHeader)
for item in xasyItems:
file.write(item.getCode()+"\n\n")
file.write(fileFooter)
if __name__ == '__main__':
root = Tk()
try:
name = raw_input("enter file name (\"../../xasyTest.asy\"):")
if name == '':
name = "../../xasyTest.asy"
f = open(name,"rt")
except:
print ("Could not open file.")
asy.quit()
sys.exit(1)
fileItems = []
try:
fileItems = parseFile(f)
res = [str(a) for a in fileItems]
print ("----------------------------------")
print ("Objects in {:s}".format(f.name))
print ("----------------------------------")
for a in res:
print (a)
print ("----------------------------------")
print ("successful parse")
f.close()
except:
f.close()
print ("parse failed")
raise
print ("making a file")
f = open("testfile.asy","wt")
saveFile(f,fileItems)
f.close()
root.configure(width=500,height=500)
root.title("Results")
canv = Canvas(root,width=500,height=500)
canv.pack()
for i in fileItems[1].imageList:
canv.create_image(250+i.bbox[0],250-i.bbox[3],anchor = NW, image=i.image)
Button(root,image=i.image).pack(side=LEFT)
root.mainloop()
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