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103 lines
3.8 KiB
103 lines
3.8 KiB
#!/usr/bin/env python3
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# encoding: utf-8
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# Copyright 2020 Huawei Technologies Co., Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# ============================================================================
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import sys
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import math
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MIN_CHARS_PER_ROW = 20 # minimal number of chars on one line
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COLS_TO_ROWS_RATIO = 4 # ratio of # columns to # rows (unit is char)
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MAX_LABEL_LENGTH = 1000 # maximal number of chars of a label
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# for specified number of chars, calculate a suitable number for how many chars per row
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# Num Total Chars : n
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# Num Chars Per Row : m
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# Num Rows : k
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# (k - 1) * m < n <= k * m
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# suppose: m / k = u
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# ==> sqrt(u * n) <= m < u / 2 + sqrt(u * n + u * u / 4)
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# m = max(20, m)
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# parameters:
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# @total_chars number of total chars
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# @ratio ratio of # columns to # rows (unit is char)
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def calc_num_chars_per_row(total_chars, ratio):
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chars_per_row = math.ceil(math.sqrt(total_chars * ratio))
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return max(MIN_CHARS_PER_ROW, chars_per_row)
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def process_label_text(text):
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label_len = min(len(text), MAX_LABEL_LENGTH)
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chars_per_row = calc_num_chars_per_row(label_len, COLS_TO_ROWS_RATIO)
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if label_len <= MIN_CHARS_PER_ROW:
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return text
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beg_idx = 0
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texts = []
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while beg_idx < label_len:
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end_idx = beg_idx + chars_per_row
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if end_idx >= label_len:
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texts.append(text[beg_idx:label_len])
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else:
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texts.append(text[beg_idx:end_idx])
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beg_idx = end_idx
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return "\\n".join(texts)
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# insert '\n' to labels which are too long
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def process_file(f):
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line_text = f.readline()
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beg_idx = -1 # label begin index, index of 'label="'
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end_idx = -1 # label end index, index of '"'
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label_text = ""
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label_prefix = ""
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label_postfix = ""
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while line_text:
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line_text = line_text.rstrip()
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if beg_idx < 0:
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beg_idx = line_text.find('label="')
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if beg_idx >= 0:
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end_idx = line_text.find('"', beg_idx + len('label="'))
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if end_idx >= 0: # the full label text is on one line
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label = line_text[beg_idx + len('label="'):end_idx]
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print('%slabel="%s"%s' % (line_text[0:beg_idx], process_label_text(label), line_text[end_idx + 1:]))
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beg_idx = -1 # reset to initial conditions
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else: # the label text is distributed on multiple lines
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label_prefix = line_text[0:beg_idx]
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label_text = line_text[beg_idx + len('label="'):]
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else:
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print(line_text)
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else:
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end_idx = line_text.find('"')
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if end_idx >= 0:
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label_text = label_text + line_text[0:end_idx]
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label_postfix = line_text[end_idx + 1:]
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print('%slabel="%s"%s' % (label_prefix, process_label_text(label_text), label_postfix))
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beg_idx = -1 # reset to initial conditions
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else:
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label_text += line_text
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# print(f'{len(line_text)} - {line_text}')
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line_text = f.readline()
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if __name__ == "__main__":
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if len(sys.argv) > 1 and sys.argv[1] == "--help":
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print("Usage: %s < dotfile | dot -Tpng -o filename.png" % sys.argv[0])
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sys.exit()
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# read text from stdin
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process_file(sys.stdin)
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