Mercurial > hg
annotate mercurial/templater.py @ 14517:5a931246afc5
test-copy2: add case for moving a missing file
author | Adrian Buehlmann <adrian@cadifra.com> |
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date | Thu, 02 Jun 2011 19:43:17 +0200 |
parents | 135e244776f0 |
children | ab545a15d807 |
rev | line source |
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1909
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add doc comments to template code.
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1 # templater.py - template expansion for output |
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2 # |
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3 # Copyright 2005, 2006 Matt Mackall <mpm@selenic.com> |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
10263 | 6 # GNU General Public License version 2 or any later version. |
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7 |
3891 | 8 from i18n import _ |
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9 import sys, os |
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10 import util, config, templatefilters, parser, error |
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11 |
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12 # template parsing |
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13 |
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14 elements = { |
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15 "(": (20, ("group", 1, ")"), ("func", 1, ")")), |
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16 ",": (2, None, ("list", 2)), |
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17 "|": (5, None, ("|", 5)), |
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18 "%": (6, None, ("%", 6)), |
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19 ")": (0, None, None), |
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20 "symbol": (0, ("symbol",), None), |
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21 "string": (0, ("string",), None), |
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22 "end": (0, None, None), |
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23 } |
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24 |
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25 def tokenizer(data): |
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26 program, start, end = data |
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27 pos = start |
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28 while pos < end: |
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29 c = program[pos] |
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30 if c.isspace(): # skip inter-token whitespace |
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31 pass |
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32 elif c in "(,)%|": # handle simple operators |
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33 yield (c, None, pos) |
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34 elif (c in '"\'' or c == 'r' and |
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35 program[pos:pos + 2] in ("r'", 'r"')): # handle quoted strings |
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36 if c == 'r': |
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37 pos += 1 |
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38 c = program[pos] |
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39 decode = lambda x: x |
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40 else: |
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41 decode = lambda x: x.decode('string-escape') |
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42 pos += 1 |
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43 s = pos |
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44 while pos < end: # find closing quote |
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45 d = program[pos] |
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46 if d == '\\': # skip over escaped characters |
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47 pos += 2 |
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48 continue |
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49 if d == c: |
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50 yield ('string', decode(program[s:pos]), s) |
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51 break |
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52 pos += 1 |
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53 else: |
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54 raise error.ParseError(_("unterminated string"), s) |
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55 elif c.isalnum() or c in '_': |
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56 s = pos |
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57 pos += 1 |
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58 while pos < end: # find end of symbol |
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59 d = program[pos] |
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60 if not (d.isalnum() or d == "_"): |
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61 break |
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62 pos += 1 |
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63 sym = program[s:pos] |
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64 yield ('symbol', sym, s) |
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65 pos -= 1 |
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66 elif c == '}': |
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67 pos += 1 |
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68 break |
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69 else: |
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70 raise error.ParseError(_("syntax error"), pos) |
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71 pos += 1 |
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72 yield ('end', None, pos) |
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73 |
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74 def compiletemplate(tmpl, context): |
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75 parsed = [] |
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76 pos, stop = 0, len(tmpl) |
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77 p = parser.parser(tokenizer, elements) |
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78 |
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79 while pos < stop: |
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80 n = tmpl.find('{', pos) |
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81 if n < 0: |
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82 parsed.append(("string", tmpl[pos:])) |
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83 break |
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84 if n > 0 and tmpl[n - 1] == '\\': |
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85 # escaped |
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86 parsed.append(("string", tmpl[pos:n - 1] + "{")) |
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87 pos = n + 1 |
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88 continue |
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89 if n > pos: |
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90 parsed.append(("string", tmpl[pos:n])) |
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91 |
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92 pd = [tmpl, n + 1, stop] |
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93 parseres, pos = p.parse(pd) |
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94 parsed.append(parseres) |
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95 |
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96 return [compileexp(e, context) for e in parsed] |
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97 |
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98 def compileexp(exp, context): |
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99 t = exp[0] |
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100 if t in methods: |
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101 return methods[t](exp, context) |
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102 raise error.ParseError(_("unknown method '%s'") % t) |
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103 |
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104 # template evaluation |
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105 |
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106 def getsymbol(exp): |
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107 if exp[0] == 'symbol': |
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108 return exp[1] |
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109 raise error.ParseError(_("expected a symbol")) |
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110 |
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111 def getlist(x): |
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112 if not x: |
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113 return [] |
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114 if x[0] == 'list': |
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115 return getlist(x[1]) + [x[2]] |
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116 return [x] |
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117 |
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118 def getfilter(exp, context): |
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119 f = getsymbol(exp) |
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120 if f not in context._filters: |
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121 raise error.ParseError(_("unknown function '%s'") % f) |
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122 return context._filters[f] |
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123 |
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124 def gettemplate(exp, context): |
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125 if exp[0] == 'string': |
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126 return compiletemplate(exp[1], context) |
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127 if exp[0] == 'symbol': |
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128 return context._load(exp[1]) |
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129 raise error.ParseError(_("expected template specifier")) |
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130 |
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131 def runstring(context, mapping, data): |
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132 return data |
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133 |
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134 def runsymbol(context, mapping, key): |
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135 v = mapping.get(key) |
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136 if v is None: |
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137 v = context._defaults.get(key, '') |
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138 if hasattr(v, '__call__'): |
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139 return v(**mapping) |
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140 return v |
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141 |
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142 def buildfilter(exp, context): |
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143 func, data = compileexp(exp[1], context) |
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144 filt = getfilter(exp[2], context) |
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145 return (runfilter, (func, data, filt)) |
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146 |
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147 def runfilter(context, mapping, data): |
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148 func, data, filt = data |
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149 return filt(func(context, mapping, data)) |
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150 |
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151 def buildmap(exp, context): |
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152 func, data = compileexp(exp[1], context) |
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153 ctmpl = gettemplate(exp[2], context) |
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154 return (runmap, (func, data, ctmpl)) |
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155 |
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156 def runmap(context, mapping, data): |
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157 func, data, ctmpl = data |
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158 d = func(context, mapping, data) |
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159 lm = mapping.copy() |
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160 |
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161 for i in d: |
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162 if isinstance(i, dict): |
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163 lm.update(i) |
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164 for f, d in ctmpl: |
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165 yield f(context, lm, d) |
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166 else: |
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167 # v is not an iterable of dicts, this happen when 'key' |
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168 # has been fully expanded already and format is useless. |
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169 # If so, return the expanded value. |
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170 yield i |
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171 |
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172 def buildfunc(exp, context): |
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173 n = getsymbol(exp[1]) |
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174 args = [compileexp(x, context) for x in getlist(exp[2])] |
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175 if n in context._filters: |
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176 if len(args) != 1: |
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177 raise error.ParseError(_("filter %s expects one argument") % n) |
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178 f = context._filters[n] |
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179 return (runfilter, (args[0][0], args[0][1], f)) |
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180 elif n in context._funcs: |
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181 f = context._funcs[n] |
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182 return (f, args) |
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183 |
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184 methods = { |
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185 "string": lambda e, c: (runstring, e[1]), |
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186 "symbol": lambda e, c: (runsymbol, e[1]), |
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187 "group": lambda e, c: compileexp(e[1], c), |
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188 # ".": buildmember, |
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189 "|": buildfilter, |
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190 "%": buildmap, |
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191 "func": buildfunc, |
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192 } |
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193 |
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194 # template engine |
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195 |
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196 path = ['templates', '../templates'] |
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197 stringify = templatefilters.stringify |
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198 |
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199 def _flatten(thing): |
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200 '''yield a single stream from a possibly nested set of iterators''' |
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201 if isinstance(thing, str): |
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202 yield thing |
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203 elif not hasattr(thing, '__iter__'): |
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204 if thing is not None: |
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205 yield str(thing) |
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206 else: |
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207 for i in thing: |
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208 if isinstance(i, str): |
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209 yield i |
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210 elif not hasattr(i, '__iter__'): |
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211 if i is not None: |
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212 yield str(i) |
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213 elif i is not None: |
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214 for j in _flatten(i): |
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215 yield j |
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216 |
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217 def parsestring(s, quoted=True): |
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218 '''parse a string using simple c-like syntax. |
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219 string must be in quotes if quoted is True.''' |
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220 if quoted: |
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221 if len(s) < 2 or s[0] != s[-1]: |
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222 raise SyntaxError(_('unmatched quotes')) |
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223 return s[1:-1].decode('string_escape') |
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224 |
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225 return s.decode('string_escape') |
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226 |
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227 class engine(object): |
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228 '''template expansion engine. |
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229 |
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230 template expansion works like this. a map file contains key=value |
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231 pairs. if value is quoted, it is treated as string. otherwise, it |
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232 is treated as name of template file. |
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233 |
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234 templater is asked to expand a key in map. it looks up key, and |
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235 looks for strings like this: {foo}. it expands {foo} by looking up |
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236 foo in map, and substituting it. expansion is recursive: it stops |
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237 when there is no more {foo} to replace. |
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238 |
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239 expansion also allows formatting and filtering. |
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240 |
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241 format uses key to expand each item in list. syntax is |
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242 {key%format}. |
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243 |
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244 filter uses function to transform value. syntax is |
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245 {key|filter1|filter2|...}.''' |
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246 |
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247 def __init__(self, loader, filters={}, defaults={}): |
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248 self._loader = loader |
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249 self._filters = filters |
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250 self._defaults = defaults |
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251 self._cache = {} |
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252 |
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253 def _load(self, t): |
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254 '''load, parse, and cache a template''' |
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255 if t not in self._cache: |
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256 self._cache[t] = compiletemplate(self._loader(t), self) |
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257 return self._cache[t] |
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258 |
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259 def process(self, t, mapping): |
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260 '''Perform expansion. t is name of map element to expand. |
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261 mapping contains added elements for use during expansion. Is a |
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262 generator.''' |
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263 return _flatten(func(self, mapping, data) for func, data in |
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264 self._load(t)) |
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265 |
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266 engines = {'default': engine} |
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267 |
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268 class templater(object): |
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269 |
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270 def __init__(self, mapfile, filters={}, defaults={}, cache={}, |
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271 minchunk=1024, maxchunk=65536): |
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272 '''set up template engine. |
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273 mapfile is name of file to read map definitions from. |
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274 filters is dict of functions. each transforms a value into another. |
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275 defaults is dict of default map definitions.''' |
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276 self.mapfile = mapfile or 'template' |
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277 self.cache = cache.copy() |
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278 self.map = {} |
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279 self.base = (mapfile and os.path.dirname(mapfile)) or '' |
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280 self.filters = templatefilters.filters.copy() |
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281 self.filters.update(filters) |
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282 self.defaults = defaults |
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283 self.minchunk, self.maxchunk = minchunk, maxchunk |
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284 self.ecache = {} |
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285 |
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286 if not mapfile: |
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287 return |
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288 if not os.path.exists(mapfile): |
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289 raise util.Abort(_('style not found: %s') % mapfile) |
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290 |
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291 conf = config.config() |
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292 conf.read(mapfile) |
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293 |
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294 for key, val in conf[''].items(): |
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295 if val[0] in "'\"": |
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296 try: |
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297 self.cache[key] = parsestring(val) |
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298 except SyntaxError, inst: |
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299 raise SyntaxError('%s: %s' % |
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300 (conf.source('', key), inst.args[0])) |
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301 else: |
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302 val = 'default', val |
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303 if ':' in val[1]: |
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304 val = val[1].split(':', 1) |
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305 self.map[key] = val[0], os.path.join(self.base, val[1]) |
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306 |
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307 def __contains__(self, key): |
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308 return key in self.cache or key in self.map |
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309 |
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310 def load(self, t): |
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311 '''Get the template for the given template name. Use a local cache.''' |
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312 if not t in self.cache: |
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313 try: |
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314 self.cache[t] = util.readfile(self.map[t][1]) |
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315 except KeyError, inst: |
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316 raise util.Abort(_('"%s" not in template map') % inst.args[0]) |
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317 except IOError, inst: |
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318 raise IOError(inst.args[0], _('template file %s: %s') % |
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319 (self.map[t][1], inst.args[1])) |
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320 return self.cache[t] |
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321 |
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323 ttype = t in self.map and self.map[t][0] or 'default' |
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324 if ttype not in self.ecache: |
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325 self.ecache[ttype] = engines[ttype](self.load, |
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326 self.filters, self.defaults) |
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327 proc = self.ecache[ttype] |
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328 |
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330 if self.minchunk: |
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331 stream = util.increasingchunks(stream, min=self.minchunk, |
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332 max=self.maxchunk) |
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333 return stream |
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334 |
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335 def templatepath(name=None): |
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336 '''return location of template file or directory (if no name). |
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337 returns None if not found.''' |
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338 normpaths = [] |
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339 |
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340 # executable version (py2exe) doesn't support __file__ |
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341 if hasattr(sys, 'frozen'): |
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342 module = sys.executable |
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343 else: |
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344 module = __file__ |
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345 for f in path: |
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346 if f.startswith('/'): |
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347 p = f |
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348 else: |
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349 fl = f.split('/') |
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350 p = os.path.join(os.path.dirname(module), *fl) |
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351 if name: |
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352 p = os.path.join(p, name) |
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353 if name and os.path.exists(p): |
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354 return os.path.normpath(p) |
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355 elif os.path.isdir(p): |
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356 normpaths.append(os.path.normpath(p)) |
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357 |
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358 return normpaths |
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359 |
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360 def stylemap(styles, paths=None): |
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361 """Return path to mapfile for a given style. |
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362 |
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363 Searches mapfile in the following locations: |
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364 1. templatepath/style/map |
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365 2. templatepath/map-style |
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366 3. templatepath/map |
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367 """ |
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368 |
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369 if paths is None: |
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370 paths = templatepath() |
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371 elif isinstance(paths, str): |
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372 paths = [paths] |
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373 |
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374 if isinstance(styles, str): |
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375 styles = [styles] |
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376 |
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377 for style in styles: |
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378 if not style: |
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379 continue |
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380 locations = [os.path.join(style, 'map'), 'map-' + style] |
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381 locations.append('map') |
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382 |
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383 for path in paths: |
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384 for location in locations: |
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385 mapfile = os.path.join(path, location) |
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386 if os.path.isfile(mapfile): |
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387 return style, mapfile |
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388 |
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389 raise RuntimeError("No hgweb templates found in %r" % paths) |