d9617a499a
Indentation is handled by outputting spaces right after outputting a
newline character. That works in most cases, but would result in the
input '{}' being printed as
{
}
instead of
{
}
Fix it by outputting the indentation before outputting the next
character after a newline. The indentation value will be updated by
then.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: David Plowman <david.plowman@raspberrypi.com>
Tested-by: David Plowman <david.plowman@raspberrypi.com>
100 lines
2.8 KiB
Python
100 lines
2.8 KiB
Python
# SPDX-License-Identifier: BSD-2-Clause
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#
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# Copyright (C) 2019, Raspberry Pi (Trading) Limited
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#
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# ctt_pretty_print_json.py - camera tuning tool JSON formatter
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import sys
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class JSONPrettyPrinter(object):
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"""
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Take a collapsed JSON file and make it more readable
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"""
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def __init__(self, fout):
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self.state = {
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"indent": 0,
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"inarray": [False],
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"arraycount": [],
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"skipnewline": True,
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"need_indent": False,
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}
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self.fout = fout
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def newline(self):
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self.fout.write('\n')
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self.state["need_indent"] = True
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def write(self, c):
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if self.state["need_indent"]:
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self.fout.write(' ' * self.state["indent"] * 4)
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self.state["need_indent"] = False
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self.fout.write(c)
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def process_char(self, c):
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if c == '{':
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if not self.state["skipnewline"]:
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self.newline()
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self.write(c)
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self.state["indent"] += 1
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self.newline()
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elif c == '}':
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self.state["indent"] -= 1
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self.newline()
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self.write(c)
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elif c == '[':
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self.newline()
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self.write(c)
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self.state["indent"] += 1
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self.newline()
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self.state["inarray"] = [True] + self.state["inarray"]
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self.state["arraycount"] = [0] + self.state["arraycount"]
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elif c == ']':
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self.state["indent"] -= 1
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self.newline()
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self.state["inarray"].pop(0)
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self.state["arraycount"].pop(0)
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self.write(c)
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elif c == ':':
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self.write(c)
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self.write(' ')
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elif c == ',':
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if not self.state["inarray"][0]:
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self.write(c)
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self.write(' ')
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self.newline()
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else:
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self.write(c)
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self.state["arraycount"][0] += 1
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if self.state["arraycount"][0] == 16:
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self.state["arraycount"][0] = 0
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self.newline()
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else:
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self.write(' ')
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elif c.isspace():
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pass
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else:
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self.write(c)
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self.state["skipnewline"] = (c == '[')
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def print(self, string):
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for c in string:
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self.process_char(c)
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def pretty_print_json(str_in, output_filename):
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with open(output_filename, "w") as fout:
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printer = JSONPrettyPrinter(fout)
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printer.print(str_in)
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if __name__ == '__main__':
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if len(sys.argv) != 2:
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print("Usage: %s filename" % sys.argv[0])
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sys.exit(1)
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input_filename = sys.argv[1]
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with open(input_filename, "r") as fin:
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printer = JSONPrettyPrinter(sys.stdout)
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printer.print(fin.read())
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