128 lines
5.1 KiB
Python
128 lines
5.1 KiB
Python
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#!/usr/bin/env python3
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# This is a naive implementation of the Python Hypertext preprocessor.
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# For example, we just assume that we can hold the entire code in memory.
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# Also, this is just the preprocessor, the resulting code will not be
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# executed.
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# Yes, the comments were here first and I wrote the code after writing them and then adjusted them to reality.
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import sys
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fd = open(sys.argv[1], "r")
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lines = fd.read().split("\n")
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fd.close()
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# start text
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output = "print(\"\"\""
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# while not end of file
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while len(lines)>0:
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# grab a line to process
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line = lines.pop(0)
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# iterate over line
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i=0
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while i < len(line):
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# attempt to grab the next few characters
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try:
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# variable(s) or code
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if line[i:i+3] in ["<?p", "<?="]:
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# end text
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output = output + "\"\"\""
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# variable(s)
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if line[i:i+3] == "<?=":
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output = output + " + str("
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# store variable list
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# (may span more than just one line)
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variable_list = ""
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i = i+3
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# walk until we either encounter a ?> or a line break
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while True:
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# if line break, attempt to go to next line
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if len(line[i:])<2:
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variable_list = variable_list + line[i:]
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i = -1
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try:
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line = lines.pop(0)
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except IndexError:
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print("Unexpected end of file: No closing ?> found.", file=sys.stderr)
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sys.exit(1)
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else:
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if line[i:i+2]=="?>":
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i = i+1
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break
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else:
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# add to variable list
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variable_list = variable_list + line[i]
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i = i+1
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# split at comma and add the variables
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output = output + ") + str(".join(variable_list.split(",")) + ") + "
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# code
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elif line[i:i+4] == "<?py":
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output = output + ", end=\"\")\n"
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# determine indent
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#default to 0
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indent = 0
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try:
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# any non whitespace characters left on line?
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if not line[i+4:].strip()=="":
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# attempt to use that as indent value
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indent = int(line[i+4:])
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# determining indent failed
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except ValueError:
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print("Invalid indent: \""+line[i+4:]+"\"\n" + line, file=sys.stderr)
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sys.exit(1)
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# attempt to check for end of code
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try:
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# grab code line
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line = lines.pop(0)
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# determine appropriate unindent length to get
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# "raw" code
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unindent_length = len(line)-len(line.lstrip())
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while not "?>" in line:
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# fix indent
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line = indent*" "+line[unindent_length:]
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# add code line
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output = output + line + "\n"
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# grab next code line
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line = lines.pop(0)
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# checking for end of code failed
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except IndexError:
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print("Unexpected end of file: No closing ?> found.", file=sys.stderr)
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sys.exit(1)
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# attempt to determine indent after end of code
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indent = 0
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try:
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if not line[:line.find("?>")].strip()=="":
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indent = int(line[:line.find("?>")])
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except ValueError:
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print("Invalid indent: \""+line[:line.find("?>")]+"\"\n" + line, file=sys.stderr)
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sys.exit(1)
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# add indent after end of code
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output = output + " "*indent + "print("
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# set i accordingly to add rest of line after code
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# block end
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i = line.find("?>")+2
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# assume accidental match
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else:
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# start text
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output = output + " + \""
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# add text
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output = output + line[i]
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# end text
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output = output + "\" + "
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# start text
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output = output + "\"\"\""
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else:
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# add text
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output = output + line[i]
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# handle last characters of line
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except IndexError:
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# add text
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output = output + line[i]
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i = i+1
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output = output + "\n"
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# end text
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output = output + "\"\"\", end=\"\")\n"
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print(output)
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