# LexGen.py - implemented 2002 by Neil Hodgson neilh@scintilla.org
# Released to the public domain.

# Regenerate the Scintilla and SciTE source files that list 
# all the lexers and all the properties files. 
# Should be run whenever a new lexer is added or removed.
# Requires Python 2.1 or later
# Most files are regenerated in place with templates stored in comments.
# The VS .NET project file is generated into a different file as the 
# VS .NET environment will not retain comments when modifying the file.
# The files are copied to a string apart from sections between a 
# ++Autogenerated comment and a --Autogenerated comment which is 
# generated by the CopyWithInsertion function. After the whole
# string is instantiated, it is compared with the target file and
# if different the file is rewritten.
# Does not regenerate the Visual C++ 6 project files but does the VS .NET 
# project file.

import string
import sys
import os
import glob

# Automatically generated sections contain start and end comments, 
# a definition line and the results.
# The results are replaced by regenerating based on the definition line.
# The definition line is a comment prefix followed by "**".
# If there is a digit after the ** then this indicates which list to use
# and the digit and next character are not part of the definition
# Backslash is used as an escape within the definition line.
# The part between \( and \) is repeated for each item in the list.
# \* is replaced by each list item. \t, and \n are tab and newline.
def CopyWithInsertion(input, commentPrefix, retainDefs, *lists):
	copying = 1
	listid = 0
	output = []
	for line in input.split("\n"):
		isStartGenerated = line.startswith(commentPrefix + "++Autogenerated")
		if copying and not isStartGenerated:
			output.append(line)
		if isStartGenerated:
			if retainDefs:
				output.append(line)
			copying = 0
			definition = ""
		elif not copying and line.startswith(commentPrefix + "**"):
			if retainDefs:
				output.append(line)
			definition = line[len(commentPrefix + "**"):]
			listid = 0
			if definition[0] in string.digits:
				listid = int(definition[:1])
				definition = definition[2:]
			# Hide double slashes as a control character
			definition = definition.replace("\\\\", "\001")
			# Do some normal C style transforms
			definition = definition.replace("\\n", "\n")
			definition = definition.replace("\\t", "\t")
			# Get the doubled backslashes back as single backslashes
			definition = definition.replace("\001", "\\")
			startRepeat = definition.find("\\(")
			endRepeat = definition.find("\\)")
			intro = definition[:startRepeat]
			out = ""
			if intro.endswith("\n"):
				pos = 0
			else:
				pos = len(intro)
			out += intro
			middle = definition[startRepeat+2:endRepeat]
			for i in lists[listid]:
				item = middle.replace("\\*", i)
				if pos and (pos + len(item) >= 80):
					out += "\\\n"
					pos = 0
				out += item
				pos += len(item)
				if item.endswith("\n"):
					pos = 0
			outro = definition[endRepeat+2:]
			out += outro
			output.append(out)
		elif line.startswith(commentPrefix + "--Autogenerated"):
			copying = 1
			if retainDefs:
				output.append(line)
	return "\n".join(output)

def UpdateFile(filename, updated):
	""" If the file is different to updated then copy updated
	into the file else leave alone so CVS and make don't treat
	it as modified. """
	infile = open(filename, "rb")
	original = infile.read()
	infile.close()
	if updated != original:
		os.unlink(filename)
		out = open(filename, "wb")
		out.write(updated)
		out.close()
		print "Changed", filename
	
def RegenerateOverLists(inpath, outpath, commentPrefix, crlf, *lists):
	try:
		infile = open(inpath, "rb")
	except IOError:
		print "Can not open", inpath
		return
	original = infile.read()
	infile.close()
	contents = original.replace("\r\n", "\n")
	updated = CopyWithInsertion(contents, commentPrefix, 
		inpath == outpath, *lists)
	if crlf:
		updated = updated.replace("\n", "\r\n")
	UpdateFile(outpath, updated)

def Regenerate(filename, commentPrefix, *lists):
	RegenerateOverLists(filename, filename, commentPrefix, 1, *lists)

def RegenerateBinary(filename, commentPrefix, *lists):
	RegenerateOverLists(filename, filename, commentPrefix, 0, *lists)

def Generate(inpath, outpath, commentPrefix, *lists):
	RegenerateOverLists(inpath, outpath, commentPrefix, 1, *lists)

def FindModules(lexFile):
	modules = []
	f = open(lexFile)
	for l in f.readlines():
		if l.startswith("LexerModule"):
			l = l.replace("(", " ")
			modules.append(l.split()[1])
	return modules

root="../../"
lexFilePaths = glob.glob(root + "scintilla/src/Lex*.cxx")
lexFiles = [os.path.basename(f)[:-4] for f in lexFilePaths]
print lexFiles
lexerModules = []
for lexFile in lexFilePaths:
	lexerModules.extend(FindModules(lexFile))
otherProps = ["abbrev.properties", "Embedded.properties", "SciTEGlobal.properties", "SciTE.properties"]
propFilePaths = glob.glob(root + "scite/src/*.properties")
propFiles = [os.path.basename(f) for f in propFilePaths if os.path.basename(f) not in otherProps]
print propFiles

Regenerate(root + "scintilla/src/KeyWords.cxx", "//", lexerModules)
Regenerate(root + "scintilla/win32/makefile", "#", lexFiles)
Regenerate(root + "scintilla/win32/scintilla.mak", "#", lexFiles)
Regenerate(root + "scintilla/win32/scintilla_vc6.mak", "#", lexFiles)
RegenerateBinary(root + "scintilla/gtk/makefile", "#", lexFiles)
Regenerate(root + "scintilla/gtk/scintilla.mak", "#", lexFiles)
Regenerate(root + "scite/win32/makefile", "#", lexFiles, propFiles)
Regenerate(root + "scite/win32/scite.mak", "#", lexFiles, propFiles)
Generate(root + "scite/boundscheck/vcproj.gen", root + "scite/boundscheck/SciTE.vcproj", "#", lexFiles)