Mercurial > hg
annotate mercurial/dagparser.py @ 37838:3fe1c9263024
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author | Yuya Nishihara <yuya@tcha.org> |
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date | Sun, 29 Apr 2018 15:52:01 +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 ( |
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19 stringutil, |
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20 ) |
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21 |
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22 def parsedag(desc): |
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23 '''parses a DAG from a concise textual description; generates events |
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24 |
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25 "+n" is a linear run of n nodes based on the current default parent |
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26 "." is a single node based on the current default parent |
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27 "$" resets the default parent to -1 (implied at the start); |
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28 otherwise the default parent is always the last node created |
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29 "<p" sets the default parent to the backref p |
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30 "*p" is a fork at parent p, where p is a backref |
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31 "*p1/p2/.../pn" is a merge of parents p1..pn, where the pi are backrefs |
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32 "/p2/.../pn" is a merge of the preceding node and p2..pn |
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33 ":name" defines a label for the preceding node; labels can be redefined |
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34 "@text" emits an annotation event for text |
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35 "!command" emits an action event for the current node |
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36 "!!my command\n" is like "!", but to the end of the line |
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37 "#...\n" is a comment up to the end of the line |
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38 |
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39 Whitespace between the above elements is ignored. |
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40 |
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41 A backref is either |
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42 * a number n, which references the node curr-n, where curr is the current |
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43 node, or |
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44 * the name of a label you placed earlier using ":name", or |
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45 * empty to denote the default parent. |
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46 |
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47 All string valued-elements are either strictly alphanumeric, or must |
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48 be enclosed in double quotes ("..."), with "\" as escape character. |
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49 |
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50 Generates sequence of |
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51 |
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52 ('n', (id, [parentids])) for node creation |
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53 ('l', (id, labelname)) for labels on nodes |
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54 ('a', text) for annotations |
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55 ('c', command) for actions (!) |
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56 ('C', command) for line actions (!!) |
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57 |
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58 Examples |
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59 -------- |
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60 |
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61 Example of a complex graph (output not shown for brevity): |
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62 |
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63 >>> len(list(parsedag(b""" |
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64 ... |
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65 ... +3 # 3 nodes in linear run |
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66 ... :forkhere # a label for the last of the 3 nodes from above |
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67 ... +5 # 5 more nodes on one branch |
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68 ... :mergethis # label again |
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70 ... +10 # 10 more nodes on a parallel branch |
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71 ... @stable # following nodes will be annotated as "stable" |
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72 ... +5 # 5 nodes in stable |
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73 ... !addfile # custom command; could trigger new file in next node |
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74 ... +2 # two more nodes |
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76 ... +4 # 4 more nodes descending from merge node |
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77 ... |
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78 ... """))) |
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79 34 |
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80 |
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81 Empty list: |
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82 |
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83 >>> list(parsedag(b"")) |
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84 [] |
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85 |
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86 A simple linear run: |
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87 |
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88 >>> list(parsedag(b"+3")) |
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89 [('n', (0, [-1])), ('n', (1, [0])), ('n', (2, [1]))] |
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90 |
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91 Some non-standard ways to define such runs: |
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92 |
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93 >>> list(parsedag(b"+1+2")) |
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94 [('n', (0, [-1])), ('n', (1, [0])), ('n', (2, [1]))] |
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95 |
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96 >>> list(parsedag(b"+1*1*")) |
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97 [('n', (0, [-1])), ('n', (1, [0])), ('n', (2, [1]))] |
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98 |
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99 >>> list(parsedag(b"*")) |
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100 [('n', (0, [-1]))] |
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101 |
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102 >>> list(parsedag(b"...")) |
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103 [('n', (0, [-1])), ('n', (1, [0])), ('n', (2, [1]))] |
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104 |
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105 A fork and a join, using numeric back references: |
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106 |
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107 >>> list(parsedag(b"+2*2*/2")) |
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108 [('n', (0, [-1])), ('n', (1, [0])), ('n', (2, [0])), ('n', (3, [2, 1]))] |
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109 |
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110 >>> list(parsedag(b"+2<2+1/2")) |
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111 [('n', (0, [-1])), ('n', (1, [0])), ('n', (2, [0])), ('n', (3, [2, 1]))] |
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112 |
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113 Placing a label: |
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114 |
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115 >>> list(parsedag(b"+1 :mylabel +1")) |
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116 [('n', (0, [-1])), ('l', (0, 'mylabel')), ('n', (1, [0]))] |
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117 |
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118 An empty label (silly, really): |
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119 |
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120 >>> list(parsedag(b"+1:+1")) |
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121 [('n', (0, [-1])), ('l', (0, '')), ('n', (1, [0]))] |
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122 |
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123 Fork and join, but with labels instead of numeric back references: |
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124 |
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125 >>> list(parsedag(b"+1:f +1:p2 *f */p2")) |
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126 [('n', (0, [-1])), ('l', (0, 'f')), ('n', (1, [0])), ('l', (1, 'p2')), |
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127 ('n', (2, [0])), ('n', (3, [2, 1]))] |
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128 |
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129 >>> list(parsedag(b"+1:f +1:p2 <f +1 /p2")) |
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130 [('n', (0, [-1])), ('l', (0, 'f')), ('n', (1, [0])), ('l', (1, 'p2')), |
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131 ('n', (2, [0])), ('n', (3, [2, 1]))] |
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132 |
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133 Restarting from the root: |
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134 |
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135 >>> list(parsedag(b"+1 $ +1")) |
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136 [('n', (0, [-1])), ('n', (1, [-1]))] |
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137 |
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138 Annotations, which are meant to introduce sticky state for subsequent nodes: |
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139 |
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140 >>> list(parsedag(b"+1 @ann +1")) |
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141 [('n', (0, [-1])), ('a', 'ann'), ('n', (1, [0]))] |
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142 |
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143 >>> list(parsedag(b'+1 @"my annotation" +1')) |
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144 [('n', (0, [-1])), ('a', 'my annotation'), ('n', (1, [0]))] |
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145 |
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146 Commands, which are meant to operate on the most recently created node: |
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147 |
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148 >>> list(parsedag(b"+1 !cmd +1")) |
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149 [('n', (0, [-1])), ('c', 'cmd'), ('n', (1, [0]))] |
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150 |
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151 >>> list(parsedag(b'+1 !"my command" +1')) |
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152 [('n', (0, [-1])), ('c', 'my command'), ('n', (1, [0]))] |
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153 |
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154 >>> list(parsedag(b'+1 !!my command line\\n +1')) |
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155 [('n', (0, [-1])), ('C', 'my command line'), ('n', (1, [0]))] |
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156 |
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157 Comments, which extend to the end of the line: |
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158 |
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159 >>> list(parsedag(b'+1 # comment\\n+1')) |
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160 [('n', (0, [-1])), ('n', (1, [0]))] |
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161 |
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162 Error: |
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163 |
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164 >>> try: list(parsedag(b'+1 bad')) |
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165 ... except Exception as e: print(pycompat.sysstr(bytes(e))) |
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166 invalid character in dag description: bad... |
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167 |
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168 ''' |
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169 if not desc: |
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170 return |
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171 |
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172 wordchars = pycompat.bytestr(string.ascii_letters + string.digits) |
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173 |
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174 labels = {} |
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175 p1 = -1 |
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176 r = 0 |
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177 |
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178 def resolve(ref): |
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179 if not ref: |
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180 return p1 |
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181 elif ref[0] in pycompat.bytestr(string.digits): |
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182 return r - int(ref) |
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183 else: |
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184 return labels[ref] |
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185 |
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186 chiter = pycompat.iterbytestr(desc) |
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187 |
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188 def nextch(): |
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189 return next(chiter, '\0') |
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190 |
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191 def nextrun(c, allow): |
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192 s = '' |
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193 while c in allow: |
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194 s += c |
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195 c = nextch() |
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196 return c, s |
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197 |
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198 def nextdelimited(c, limit, escape): |
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199 s = '' |
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200 while c != limit: |
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201 if c == escape: |
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202 c = nextch() |
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203 s += c |
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204 c = nextch() |
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205 return nextch(), s |
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206 |
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207 def nextstring(c): |
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208 if c == '"': |
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209 return nextdelimited(nextch(), '"', '\\') |
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210 else: |
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211 return nextrun(c, wordchars) |
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212 |
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213 c = nextch() |
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214 while c != '\0': |
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215 while c in pycompat.bytestr(string.whitespace): |
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216 c = nextch() |
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217 if c == '.': |
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218 yield 'n', (r, [p1]) |
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219 p1 = r |
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220 r += 1 |
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221 c = nextch() |
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222 elif c == '+': |
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223 c, digs = nextrun(nextch(), pycompat.bytestr(string.digits)) |
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224 n = int(digs) |
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225 for i in xrange(0, n): |
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226 yield 'n', (r, [p1]) |
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227 p1 = r |
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228 r += 1 |
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Brodie Rao <brodie@bitheap.org>
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229 elif c in '*/': |
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230 if c == '*': |
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231 c = nextch() |
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232 c, pref = nextstring(c) |
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233 prefs = [pref] |
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234 while c == '/': |
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235 c, pref = nextstring(nextch()) |
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236 prefs.append(pref) |
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237 ps = [resolve(ref) for ref in prefs] |
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238 yield 'n', (r, ps) |
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239 p1 = r |
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240 r += 1 |
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241 elif c == '<': |
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242 c, ref = nextstring(nextch()) |
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243 p1 = resolve(ref) |
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244 elif c == ':': |
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245 c, name = nextstring(nextch()) |
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246 labels[name] = p1 |
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247 yield 'l', (p1, name) |
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248 elif c == '@': |
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249 c, text = nextstring(nextch()) |
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250 yield 'a', text |
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parents:
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251 elif c == '!': |
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252 c = nextch() |
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253 if c == '!': |
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254 cmd = '' |
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255 c = nextch() |
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256 while c not in '\n\r\0': |
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257 cmd += c |
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258 c = nextch() |
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259 yield 'C', cmd |
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260 else: |
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|
261 c, cmd = nextstring(c) |
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262 yield 'c', cmd |
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263 elif c == '#': |
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264 while c not in '\n\r\0': |
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265 c = nextch() |
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266 elif c == '$': |
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267 p1 = -1 |
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268 c = nextch() |
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269 elif c == '\0': |
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270 return # in case it was preceded by whitespace |
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
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271 else: |
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
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272 s = '' |
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
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273 i = 0 |
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
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|
274 while c != '\0' and i < 10: |
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
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275 s += c |
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
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276 i += 1 |
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|
277 c = nextch() |
26587
56b2bcea2529
error: get Abort from 'error' instead of 'util'
Pierre-Yves David <pierre-yves.david@fb.com>
parents:
25941
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|
278 raise error.Abort(_('invalid character in dag description: ' |
16683 | 279 '%s...') % s) |
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280 |
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|
281 def dagtextlines(events, |
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282 addspaces=True, |
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283 wraplabels=False, |
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284 wrapannotations=False, |
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parents:
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285 wrapcommands=False, |
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|
286 wrapnonlinear=False, |
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|
287 usedots=False, |
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parents:
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|
288 maxlinewidth=70): |
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|
289 '''generates single lines for dagtext()''' |
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|
290 |
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parents:
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291 def wrapstring(text): |
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292 if re.match("^[0-9a-z]*$", text): |
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293 return text |
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
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|
294 return '"' + text.replace('\\', '\\\\').replace('"', '\"') + '"' |
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parents:
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|
295 |
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parents:
diff
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|
296 def gen(): |
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
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diff
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|
297 labels = {} |
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff
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|
298 run = 0 |
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff
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|
299 wantr = 0 |
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parents:
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300 needroot = False |
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
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|
301 for kind, data in events: |
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
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|
302 if kind == 'n': |
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parents:
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|
303 r, ps = data |
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parents:
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|
304 |
3201ff1459dd
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff
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|
305 # sanity check |
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff
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|
306 if r != wantr: |
26587
56b2bcea2529
error: get Abort from 'error' instead of 'util'
Pierre-Yves David <pierre-yves.david@fb.com>
parents:
25941
diff
changeset
|
307 raise error.Abort(_("expected id %i, got %i") % (wantr, r)) |
11335
3201ff1459dd
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
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|
308 if not ps: |
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parents:
diff
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|
309 ps = [-1] |
3201ff1459dd
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
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|
310 else: |
3201ff1459dd
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff
changeset
|
311 for p in ps: |
3201ff1459dd
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff
changeset
|
312 if p >= r: |
26587
56b2bcea2529
error: get Abort from 'error' instead of 'util'
Pierre-Yves David <pierre-yves.david@fb.com>
parents:
25941
diff
changeset
|
313 raise error.Abort(_("parent id %i is larger than " |
12134
26d86a6cf2af
dagparser: translate and lowercase error messages
Martin Geisler <mg@aragost.com>
parents:
11879
diff
changeset
|
314 "current id %i") % (p, r)) |
11335
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff
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|
315 wantr += 1 |
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parents:
diff
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|
316 |
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff
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|
317 # new root? |
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
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|
318 p1 = r - 1 |
3201ff1459dd
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parents:
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|
319 if len(ps) == 1 and ps[0] == -1: |
3201ff1459dd
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
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|
320 if needroot: |
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff
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|
321 if run: |
34210
8927534cacbc
py3: drop use of str() in dagparser.py
Yuya Nishihara <yuya@tcha.org>
parents:
34209
diff
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|
322 yield '+%d' % run |
11335
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff
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|
323 run = 0 |
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff
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|
324 if wrapnonlinear: |
3201ff1459dd
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff
changeset
|
325 yield '\n' |
3201ff1459dd
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff
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|
326 yield '$' |
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff
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|
327 p1 = -1 |
3201ff1459dd
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff
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|
328 else: |
3201ff1459dd
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff
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|
329 needroot = True |
3201ff1459dd
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff
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|
330 if len(ps) == 1 and ps[0] == p1: |
3201ff1459dd
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff
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|
331 if usedots: |
3201ff1459dd
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff
changeset
|
332 yield "." |
3201ff1459dd
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff
changeset
|
333 else: |
3201ff1459dd
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff
changeset
|
334 run += 1 |
3201ff1459dd
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff
changeset
|
335 else: |
3201ff1459dd
dagparser: parses and formats DAGs as concise text
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff
changeset
|
336 if run: |
34210
8927534cacbc
py3: drop use of str() in dagparser.py
Yuya Nishihara <yuya@tcha.org>
parents:
34209
diff
changeset
|
337 yield '+%d' % run |
11335
3201ff1459dd
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff
changeset
|
338 run = 0 |
3201ff1459dd
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff
changeset
|
339 if wrapnonlinear: |
3201ff1459dd
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff
changeset
|
340 yield '\n' |
3201ff1459dd
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff
changeset
|
341 prefs = [] |
3201ff1459dd
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff
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|
342 for p in ps: |
3201ff1459dd
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff
changeset
|
343 if p == p1: |
3201ff1459dd
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff
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|
344 prefs.append('') |
3201ff1459dd
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff
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|
345 elif p in labels: |
3201ff1459dd
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Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff
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|
346 prefs.append(labels[p]) |
3201ff1459dd
dagparser: parses and formats DAGs as concise text
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff
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|
347 else: |
34210
8927534cacbc
py3: drop use of str() in dagparser.py
Yuya Nishihara <yuya@tcha.org>
parents:
34209
diff
changeset
|
348 prefs.append('%d' % (r - p)) |
11335
3201ff1459dd
dagparser: parses and formats DAGs as concise text
Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
parents:
diff
changeset
|
349 yield '*' + '/'.join(prefs) |
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350 else: |
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351 if run: |
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352 yield '+%d' % run |
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353 run = 0 |
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354 if kind == 'l': |
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355 rid, name = data |
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356 labels[rid] = name |
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357 yield ':' + name |
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358 if wraplabels: |
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359 yield '\n' |
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360 elif kind == 'c': |
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361 yield '!' + wrapstring(data) |
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362 if wrapcommands: |
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363 yield '\n' |
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364 elif kind == 'C': |
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365 yield '!!' + data |
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366 yield '\n' |
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367 elif kind == 'a': |
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368 if wrapannotations: |
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369 yield '\n' |
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370 yield '@' + wrapstring(data) |
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371 elif kind == '#': |
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372 yield '#' + data |
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373 yield '\n' |
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374 else: |
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375 raise error.Abort(_("invalid event type in dag: " |
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376 "('%s', '%s')") |
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377 % (stringutil.escapestr(kind), |
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378 stringutil.escapestr(data))) |
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379 if run: |
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380 yield '+%d' % run |
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381 |
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382 line = '' |
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383 for part in gen(): |
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384 if part == '\n': |
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385 if line: |
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386 yield line |
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387 line = '' |
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388 else: |
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389 if len(line) + len(part) >= maxlinewidth: |
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390 yield line |
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391 line = '' |
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392 elif addspaces and line and part != '.': |
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393 line += ' ' |
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394 line += part |
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395 if line: |
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396 yield line |
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397 |
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398 def dagtext(dag, |
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399 addspaces=True, |
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400 wraplabels=False, |
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401 wrapannotations=False, |
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402 wrapcommands=False, |
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403 wrapnonlinear=False, |
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404 usedots=False, |
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405 maxlinewidth=70): |
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406 '''generates lines of a textual representation for a dag event stream |
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407 |
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408 events should generate what parsedag() does, so: |
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409 |
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410 ('n', (id, [parentids])) for node creation |
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411 ('l', (id, labelname)) for labels on nodes |
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412 ('a', text) for annotations |
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413 ('c', text) for commands |
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414 ('C', text) for line commands ('!!') |
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415 ('#', text) for comment lines |
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416 |
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417 Parent nodes must come before child nodes. |
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418 |
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419 Examples |
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420 -------- |
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421 |
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422 Linear run: |
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423 |
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424 >>> dagtext([(b'n', (0, [-1])), (b'n', (1, [0]))]) |
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425 '+2' |
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426 |
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427 Two roots: |
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428 |
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429 >>> dagtext([(b'n', (0, [-1])), (b'n', (1, [-1]))]) |
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430 '+1 $ +1' |
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431 |
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432 Fork and join: |
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433 |
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434 >>> dagtext([(b'n', (0, [-1])), (b'n', (1, [0])), (b'n', (2, [0])), |
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435 ... (b'n', (3, [2, 1]))]) |
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436 '+2 *2 */2' |
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437 |
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438 Fork and join with labels: |
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439 |
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440 >>> dagtext([(b'n', (0, [-1])), (b'l', (0, b'f')), (b'n', (1, [0])), |
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441 ... (b'l', (1, b'p2')), (b'n', (2, [0])), (b'n', (3, [2, 1]))]) |
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442 '+1 :f +1 :p2 *f */p2' |
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443 |
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444 Annotations: |
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445 |
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446 >>> dagtext([(b'n', (0, [-1])), (b'a', b'ann'), (b'n', (1, [0]))]) |
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447 '+1 @ann +1' |
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448 |
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449 >>> dagtext([(b'n', (0, [-1])), |
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450 ... (b'a', b'my annotation'), |
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451 ... (b'n', (1, [0]))]) |
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452 '+1 @"my annotation" +1' |
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453 |
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454 Commands: |
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455 |
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456 >>> dagtext([(b'n', (0, [-1])), (b'c', b'cmd'), (b'n', (1, [0]))]) |
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457 '+1 !cmd +1' |
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458 |
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459 >>> dagtext([(b'n', (0, [-1])), |
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460 ... (b'c', b'my command'), |
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461 ... (b'n', (1, [0]))]) |
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462 '+1 !"my command" +1' |
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463 |
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464 >>> dagtext([(b'n', (0, [-1])), |
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465 ... (b'C', b'my command line'), |
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466 ... (b'n', (1, [0]))]) |
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467 '+1 !!my command line\\n+1' |
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468 |
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469 Comments: |
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470 |
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471 >>> dagtext([(b'n', (0, [-1])), (b'#', b' comment'), (b'n', (1, [0]))]) |
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472 '+1 # comment\\n+1' |
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473 |
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474 >>> dagtext([]) |
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475 '' |
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476 |
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477 Combining parsedag and dagtext: |
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478 |
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479 >>> dagtext(parsedag(b'+1 :f +1 :p2 *f */p2')) |
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480 '+1 :f +1 :p2 *f */p2' |
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481 |
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482 ''' |
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483 return "\n".join(dagtextlines(dag, |
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484 addspaces, |
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485 wraplabels, |
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486 wrapannotations, |
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487 wrapcommands, |
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488 wrapnonlinear, |
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489 usedots, |
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490 maxlinewidth)) |