Mercurial > hg
annotate mercurial/dagparser.py @ 43679:7cf332318f62
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author | Yuya Nishihara <yuya@tcha.org> |
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date | Sat, 16 Nov 2019 15:43:21 +0900 |
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1 # dagparser.py - parser and generator for concise description of DAGs |
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2 # |
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3 # Copyright 2010 Peter Arrenbrecht <peter@arrenbrecht.ch> |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
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6 # GNU General Public License version 2 or any later version. |
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7 |
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8 from __future__ import absolute_import |
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9 |
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10 import re |
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11 import string |
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12 |
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13 from .i18n import _ |
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14 from . import ( |
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15 error, |
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16 pycompat, |
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17 ) |
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18 from .utils import stringutil |
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19 |
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20 |
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21 def parsedag(desc): |
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22 '''parses a DAG from a concise textual description; generates events |
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23 |
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24 "+n" is a linear run of n nodes based on the current default parent |
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25 "." is a single node based on the current default parent |
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26 "$" resets the default parent to -1 (implied at the start); |
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27 otherwise the default parent is always the last node created |
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28 "<p" sets the default parent to the backref p |
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29 "*p" is a fork at parent p, where p is a backref |
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30 "*p1/p2/.../pn" is a merge of parents p1..pn, where the pi are backrefs |
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31 "/p2/.../pn" is a merge of the preceding node and p2..pn |
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32 ":name" defines a label for the preceding node; labels can be redefined |
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33 "@text" emits an annotation event for text |
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34 "!command" emits an action event for the current node |
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35 "!!my command\n" is like "!", but to the end of the line |
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36 "#...\n" is a comment up to the end of the line |
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37 |
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38 Whitespace between the above elements is ignored. |
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39 |
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40 A backref is either |
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41 * a number n, which references the node curr-n, where curr is the current |
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42 node, or |
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43 * the name of a label you placed earlier using ":name", or |
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44 * empty to denote the default parent. |
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45 |
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46 All string valued-elements are either strictly alphanumeric, or must |
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47 be enclosed in double quotes ("..."), with "\" as escape character. |
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48 |
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49 Generates sequence of |
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50 |
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51 ('n', (id, [parentids])) for node creation |
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52 ('l', (id, labelname)) for labels on nodes |
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53 ('a', text) for annotations |
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54 ('c', command) for actions (!) |
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55 ('C', command) for line actions (!!) |
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56 |
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57 Examples |
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58 -------- |
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59 |
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60 Example of a complex graph (output not shown for brevity): |
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61 |
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62 >>> len(list(parsedag(b""" |
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63 ... |
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64 ... +3 # 3 nodes in linear run |
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65 ... :forkhere # a label for the last of the 3 nodes from above |
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66 ... +5 # 5 more nodes on one branch |
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67 ... :mergethis # label again |
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69 ... +10 # 10 more nodes on a parallel branch |
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70 ... @stable # following nodes will be annotated as "stable" |
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71 ... +5 # 5 nodes in stable |
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72 ... !addfile # custom command; could trigger new file in next node |
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73 ... +2 # two more nodes |
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75 ... +4 # 4 more nodes descending from merge node |
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76 ... |
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77 ... """))) |
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78 34 |
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79 |
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80 Empty list: |
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81 |
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82 >>> list(parsedag(b"")) |
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83 [] |
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84 |
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85 A simple linear run: |
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86 |
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87 >>> list(parsedag(b"+3")) |
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88 [('n', (0, [-1])), ('n', (1, [0])), ('n', (2, [1]))] |
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89 |
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90 Some non-standard ways to define such runs: |
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91 |
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92 >>> list(parsedag(b"+1+2")) |
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93 [('n', (0, [-1])), ('n', (1, [0])), ('n', (2, [1]))] |
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94 |
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95 >>> list(parsedag(b"+1*1*")) |
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96 [('n', (0, [-1])), ('n', (1, [0])), ('n', (2, [1]))] |
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97 |
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98 >>> list(parsedag(b"*")) |
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99 [('n', (0, [-1]))] |
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100 |
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101 >>> list(parsedag(b"...")) |
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102 [('n', (0, [-1])), ('n', (1, [0])), ('n', (2, [1]))] |
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103 |
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104 A fork and a join, using numeric back references: |
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105 |
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106 >>> list(parsedag(b"+2*2*/2")) |
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107 [('n', (0, [-1])), ('n', (1, [0])), ('n', (2, [0])), ('n', (3, [2, 1]))] |
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108 |
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109 >>> list(parsedag(b"+2<2+1/2")) |
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110 [('n', (0, [-1])), ('n', (1, [0])), ('n', (2, [0])), ('n', (3, [2, 1]))] |
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111 |
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112 Placing a label: |
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113 |
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114 >>> list(parsedag(b"+1 :mylabel +1")) |
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115 [('n', (0, [-1])), ('l', (0, 'mylabel')), ('n', (1, [0]))] |
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116 |
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117 An empty label (silly, really): |
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118 |
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119 >>> list(parsedag(b"+1:+1")) |
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120 [('n', (0, [-1])), ('l', (0, '')), ('n', (1, [0]))] |
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121 |
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122 Fork and join, but with labels instead of numeric back references: |
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123 |
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124 >>> list(parsedag(b"+1:f +1:p2 *f */p2")) |
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125 [('n', (0, [-1])), ('l', (0, 'f')), ('n', (1, [0])), ('l', (1, 'p2')), |
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126 ('n', (2, [0])), ('n', (3, [2, 1]))] |
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127 |
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128 >>> list(parsedag(b"+1:f +1:p2 <f +1 /p2")) |
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129 [('n', (0, [-1])), ('l', (0, 'f')), ('n', (1, [0])), ('l', (1, 'p2')), |
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130 ('n', (2, [0])), ('n', (3, [2, 1]))] |
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131 |
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132 Restarting from the root: |
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133 |
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134 >>> list(parsedag(b"+1 $ +1")) |
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135 [('n', (0, [-1])), ('n', (1, [-1]))] |
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136 |
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137 Annotations, which are meant to introduce sticky state for subsequent nodes: |
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138 |
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139 >>> list(parsedag(b"+1 @ann +1")) |
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140 [('n', (0, [-1])), ('a', 'ann'), ('n', (1, [0]))] |
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141 |
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142 >>> list(parsedag(b'+1 @"my annotation" +1')) |
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143 [('n', (0, [-1])), ('a', 'my annotation'), ('n', (1, [0]))] |
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144 |
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145 Commands, which are meant to operate on the most recently created node: |
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146 |
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147 >>> list(parsedag(b"+1 !cmd +1")) |
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148 [('n', (0, [-1])), ('c', 'cmd'), ('n', (1, [0]))] |
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149 |
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150 >>> list(parsedag(b'+1 !"my command" +1')) |
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151 [('n', (0, [-1])), ('c', 'my command'), ('n', (1, [0]))] |
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152 |
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153 >>> list(parsedag(b'+1 !!my command line\\n +1')) |
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154 [('n', (0, [-1])), ('C', 'my command line'), ('n', (1, [0]))] |
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155 |
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156 Comments, which extend to the end of the line: |
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157 |
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158 >>> list(parsedag(b'+1 # comment\\n+1')) |
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159 [('n', (0, [-1])), ('n', (1, [0]))] |
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160 |
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161 Error: |
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162 |
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163 >>> try: list(parsedag(b'+1 bad')) |
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164 ... except Exception as e: print(pycompat.sysstr(bytes(e))) |
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165 invalid character in dag description: bad... |
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166 |
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167 ''' |
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168 if not desc: |
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169 return |
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170 |
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171 wordchars = pycompat.bytestr( |
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172 string.ascii_letters + string.digits |
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173 ) # pytype: disable=wrong-arg-types |
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174 |
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175 labels = {} |
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176 p1 = -1 |
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177 r = 0 |
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178 |
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179 def resolve(ref): |
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180 if not ref: |
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181 return p1 |
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182 elif ref[0] in pycompat.bytestr( |
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183 string.digits |
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184 ): # pytype: disable=wrong-arg-types |
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185 return r - int(ref) |
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186 else: |
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187 return labels[ref] |
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188 |
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189 chiter = pycompat.iterbytestr(desc) |
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190 |
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191 def nextch(): |
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192 return next(chiter, b'\0') |
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193 |
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194 def nextrun(c, allow): |
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195 s = b'' |
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196 while c in allow: |
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197 s += c |
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198 c = nextch() |
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199 return c, s |
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200 |
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201 def nextdelimited(c, limit, escape): |
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202 s = b'' |
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203 while c != limit: |
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204 if c == escape: |
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205 c = nextch() |
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206 s += c |
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207 c = nextch() |
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208 return nextch(), s |
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209 |
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210 def nextstring(c): |
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211 if c == b'"': |
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212 return nextdelimited(nextch(), b'"', b'\\') |
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213 else: |
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214 return nextrun(c, wordchars) |
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215 |
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216 c = nextch() |
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217 while c != b'\0': |
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218 while c in pycompat.bytestr( |
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219 string.whitespace |
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220 ): # pytype: disable=wrong-arg-types |
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221 c = nextch() |
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222 if c == b'.': |
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223 yield b'n', (r, [p1]) |
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224 p1 = r |
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225 r += 1 |
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226 c = nextch() |
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227 elif c == b'+': |
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228 c, digs = nextrun( |
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229 nextch(), pycompat.bytestr(string.digits) |
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230 ) # pytype: disable=wrong-arg-types |
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231 n = int(digs) |
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232 for i in pycompat.xrange(0, n): |
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233 yield b'n', (r, [p1]) |
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234 p1 = r |
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235 r += 1 |
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236 elif c in b'*/': |
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237 if c == b'*': |
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238 c = nextch() |
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239 c, pref = nextstring(c) |
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240 prefs = [pref] |
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241 while c == b'/': |
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242 c, pref = nextstring(nextch()) |
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243 prefs.append(pref) |
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244 ps = [resolve(ref) for ref in prefs] |
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245 yield b'n', (r, ps) |
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246 p1 = r |
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247 r += 1 |
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248 elif c == b'<': |
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249 c, ref = nextstring(nextch()) |
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250 p1 = resolve(ref) |
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251 elif c == b':': |
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252 c, name = nextstring(nextch()) |
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253 labels[name] = p1 |
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254 yield b'l', (p1, name) |
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255 elif c == b'@': |
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256 c, text = nextstring(nextch()) |
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257 yield b'a', text |
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258 elif c == b'!': |
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259 c = nextch() |
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260 if c == b'!': |
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261 cmd = b'' |
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262 c = nextch() |
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263 while c not in b'\n\r\0': |
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264 cmd += c |
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265 c = nextch() |
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266 yield b'C', cmd |
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267 else: |
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268 c, cmd = nextstring(c) |
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269 yield b'c', cmd |
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270 elif c == b'#': |
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271 while c not in b'\n\r\0': |
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272 c = nextch() |
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273 elif c == b'$': |
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274 p1 = -1 |
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275 c = nextch() |
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276 elif c == b'\0': |
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277 return # in case it was preceded by whitespace |
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278 else: |
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279 s = b'' |
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280 i = 0 |
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281 while c != b'\0' and i < 10: |
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282 s += c |
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283 i += 1 |
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284 c = nextch() |
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285 raise error.Abort( |
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286 _(b'invalid character in dag description: %s...') % s |
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287 ) |
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288 |
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289 |
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290 def dagtextlines( |
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291 events, |
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292 addspaces=True, |
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293 wraplabels=False, |
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294 wrapannotations=False, |
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295 wrapcommands=False, |
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296 wrapnonlinear=False, |
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297 usedots=False, |
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298 maxlinewidth=70, |
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299 ): |
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300 '''generates single lines for dagtext()''' |
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301 |
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302 def wrapstring(text): |
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303 if re.match(b"^[0-9a-z]*$", text): |
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304 return text |
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305 return b'"' + text.replace(b'\\', b'\\\\').replace(b'"', b'\"') + b'"' |
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306 |
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307 def gen(): |
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308 labels = {} |
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309 run = 0 |
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310 wantr = 0 |
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311 needroot = False |
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312 for kind, data in events: |
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313 if kind == b'n': |
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314 r, ps = data |
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315 |
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316 # sanity check |
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317 if r != wantr: |
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318 raise error.Abort(_(b"expected id %i, got %i") % (wantr, r)) |
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319 if not ps: |
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320 ps = [-1] |
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321 else: |
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322 for p in ps: |
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323 if p >= r: |
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324 raise error.Abort( |
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325 _( |
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326 b"parent id %i is larger than " |
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327 b"current id %i" |
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328 ) |
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329 % (p, r) |
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330 ) |
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331 wantr += 1 |
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332 |
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333 # new root? |
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334 p1 = r - 1 |
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335 if len(ps) == 1 and ps[0] == -1: |
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336 if needroot: |
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337 if run: |
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338 yield b'+%d' % run |
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339 run = 0 |
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340 if wrapnonlinear: |
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341 yield b'\n' |
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342 yield b'$' |
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343 p1 = -1 |
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344 else: |
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345 needroot = True |
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346 if len(ps) == 1 and ps[0] == p1: |
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347 if usedots: |
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348 yield b"." |
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349 else: |
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350 run += 1 |
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351 else: |
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352 if run: |
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353 yield b'+%d' % run |
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354 run = 0 |
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355 if wrapnonlinear: |
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356 yield b'\n' |
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357 prefs = [] |
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358 for p in ps: |
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359 if p == p1: |
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360 prefs.append(b'') |
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361 elif p in labels: |
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362 prefs.append(labels[p]) |
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363 else: |
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364 prefs.append(b'%d' % (r - p)) |
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365 yield b'*' + b'/'.join(prefs) |
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366 else: |
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367 if run: |
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368 yield b'+%d' % run |
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369 run = 0 |
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370 if kind == b'l': |
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371 rid, name = data |
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372 labels[rid] = name |
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373 yield b':' + name |
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374 if wraplabels: |
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375 yield b'\n' |
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376 elif kind == b'c': |
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377 yield b'!' + wrapstring(data) |
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378 if wrapcommands: |
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379 yield b'\n' |
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380 elif kind == b'C': |
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381 yield b'!!' + data |
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382 yield b'\n' |
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383 elif kind == b'a': |
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384 if wrapannotations: |
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385 yield b'\n' |
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386 yield b'@' + wrapstring(data) |
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387 elif kind == b'#': |
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388 yield b'#' + data |
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389 yield b'\n' |
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parents:
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390 else: |
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391 raise error.Abort( |
43117
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cleanup: join string literals that are already on one line
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392 _(b"invalid event type in dag: ('%s', '%s')") |
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393 % ( |
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394 stringutil.escapestr(kind), |
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395 stringutil.escapestr(data), |
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396 ) |
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397 ) |
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398 if run: |
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399 yield b'+%d' % run |
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400 |
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401 line = b'' |
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402 for part in gen(): |
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403 if part == b'\n': |
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404 if line: |
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parents:
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|
405 yield line |
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406 line = b'' |
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407 else: |
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408 if len(line) + len(part) >= maxlinewidth: |
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parents:
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|
409 yield line |
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410 line = b'' |
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411 elif addspaces and line and part != b'.': |
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412 line += b' ' |
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413 line += part |
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parents:
diff
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|
414 if line: |
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dagparser: parses and formats DAGs as concise text
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff
changeset
|
415 yield line |
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff
changeset
|
416 |
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417 |
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418 def dagtext( |
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419 dag, |
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420 addspaces=True, |
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421 wraplabels=False, |
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422 wrapannotations=False, |
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423 wrapcommands=False, |
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424 wrapnonlinear=False, |
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425 usedots=False, |
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426 maxlinewidth=70, |
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|
427 ): |
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428 '''generates lines of a textual representation for a dag event stream |
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parents:
diff
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|
429 |
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parents:
diff
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|
430 events should generate what parsedag() does, so: |
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parents:
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|
431 |
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parents:
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|
432 ('n', (id, [parentids])) for node creation |
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parents:
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|
433 ('l', (id, labelname)) for labels on nodes |
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parents:
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|
434 ('a', text) for annotations |
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parents:
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|
435 ('c', text) for commands |
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dagparser: parses and formats DAGs as concise text
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff
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|
436 ('C', text) for line commands ('!!') |
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
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|
437 ('#', text) for comment lines |
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parents:
diff
changeset
|
438 |
3201ff1459dd
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parents:
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|
439 Parent nodes must come before child nodes. |
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parents:
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changeset
|
440 |
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parents:
diff
changeset
|
441 Examples |
3201ff1459dd
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parents:
diff
changeset
|
442 -------- |
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff
changeset
|
443 |
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dagparser: parses and formats DAGs as concise text
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parents:
diff
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|
444 Linear run: |
3201ff1459dd
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parents:
diff
changeset
|
445 |
34131
0fa781320203
doctest: bulk-replace string literals with b'' for Python 3
Yuya Nishihara <yuya@tcha.org>
parents:
33716
diff
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|
446 >>> dagtext([(b'n', (0, [-1])), (b'n', (1, [0]))]) |
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parents:
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|
447 '+2' |
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parents:
diff
changeset
|
448 |
3201ff1459dd
dagparser: parses and formats DAGs as concise text
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff
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|
449 Two roots: |
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parents:
diff
changeset
|
450 |
34131
0fa781320203
doctest: bulk-replace string literals with b'' for Python 3
Yuya Nishihara <yuya@tcha.org>
parents:
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diff
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|
451 >>> dagtext([(b'n', (0, [-1])), (b'n', (1, [-1]))]) |
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|
452 '+1 $ +1' |
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parents:
diff
changeset
|
453 |
3201ff1459dd
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parents:
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changeset
|
454 Fork and join: |
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parents:
diff
changeset
|
455 |
34131
0fa781320203
doctest: bulk-replace string literals with b'' for Python 3
Yuya Nishihara <yuya@tcha.org>
parents:
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|
456 >>> dagtext([(b'n', (0, [-1])), (b'n', (1, [0])), (b'n', (2, [0])), |
0fa781320203
doctest: bulk-replace string literals with b'' for Python 3
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parents:
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|
457 ... (b'n', (3, [2, 1]))]) |
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parents:
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|
458 '+2 *2 */2' |
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff
changeset
|
459 |
3201ff1459dd
dagparser: parses and formats DAGs as concise text
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff
changeset
|
460 Fork and join with labels: |
3201ff1459dd
dagparser: parses and formats DAGs as concise text
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff
changeset
|
461 |
34131
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doctest: bulk-replace string literals with b'' for Python 3
Yuya Nishihara <yuya@tcha.org>
parents:
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462 >>> dagtext([(b'n', (0, [-1])), (b'l', (0, b'f')), (b'n', (1, [0])), |
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463 ... (b'l', (1, b'p2')), (b'n', (2, [0])), (b'n', (3, [2, 1]))]) |
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464 '+1 :f +1 :p2 *f */p2' |
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465 |
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466 Annotations: |
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467 |
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468 >>> dagtext([(b'n', (0, [-1])), (b'a', b'ann'), (b'n', (1, [0]))]) |
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469 '+1 @ann +1' |
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470 |
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471 >>> dagtext([(b'n', (0, [-1])), |
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472 ... (b'a', b'my annotation'), |
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473 ... (b'n', (1, [0]))]) |
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474 '+1 @"my annotation" +1' |
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475 |
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476 Commands: |
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477 |
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478 >>> dagtext([(b'n', (0, [-1])), (b'c', b'cmd'), (b'n', (1, [0]))]) |
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479 '+1 !cmd +1' |
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480 |
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481 >>> dagtext([(b'n', (0, [-1])), |
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482 ... (b'c', b'my command'), |
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483 ... (b'n', (1, [0]))]) |
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484 '+1 !"my command" +1' |
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485 |
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486 >>> dagtext([(b'n', (0, [-1])), |
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487 ... (b'C', b'my command line'), |
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488 ... (b'n', (1, [0]))]) |
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489 '+1 !!my command line\\n+1' |
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490 |
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491 Comments: |
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492 |
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493 >>> dagtext([(b'n', (0, [-1])), (b'#', b' comment'), (b'n', (1, [0]))]) |
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494 '+1 # comment\\n+1' |
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495 |
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496 >>> dagtext([]) |
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497 '' |
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498 |
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499 Combining parsedag and dagtext: |
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500 |
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501 >>> dagtext(parsedag(b'+1 :f +1 :p2 *f */p2')) |
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502 '+1 :f +1 :p2 *f */p2' |
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503 |
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504 ''' |
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505 return b"\n".join( |
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506 dagtextlines( |
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507 dag, |
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508 addspaces, |
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509 wraplabels, |
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510 wrapannotations, |
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511 wrapcommands, |
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512 wrapnonlinear, |
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513 usedots, |
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514 maxlinewidth, |
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515 ) |
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516 ) |