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XSLScript: some preliminary grammar, incomplete.
author Maxim Dounin <mdounin@mdounin.ru>
date Wed, 19 Feb 2014 22:44:08 +0400
parents
children bcd96c403898
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1
f082f8c2ebb0 XSLScript: some preliminary grammar, incomplete.
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1 #!/usr/bin/perl
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2
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3 # (C) Maxim Dounin
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4
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5 # Convert from XSLScript to XSLT.
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6 #
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7 # Originally XSLScript was written by Paul Tchistopolskii. It is believed
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8 # to be mostly identical to XSLT, but uses shorter syntax. Original
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9 # implementation has major Java dependency, no longer supported and hard
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10 # to find.
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11 #
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12 # This code doesn't pretend to be a full replacement, but rather an attempt
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13 # to provide functionality needed for nginx documentation.
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14
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15 ###############################################################################
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16
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17 use warnings;
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18 use strict;
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19
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20 use Parse::RecDescent;
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21 use Getopt::Long;
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22 use Data::Dumper qw/Dumper/;
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23
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24 ###############################################################################
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25
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26 GetOptions(
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27 "trace!" => \$::RD_TRACE,
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28 "hint!" => \$::RD_HINT,
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29 )
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30 or die "oops\n";
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31
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32 ###############################################################################
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33
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34 my $grammar = <<'EOF';
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35
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36 # XSLTScript grammar, reconstructed
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37
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38 startrule : item(s) eofile
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39 { $return = $item[1] }
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40
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41 #item : "<!--" <commit> comment
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42 # | "!" <commit> shortcut
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43 # | "<%" <commit> instruction "%>"
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44 # | instruction_name <commit>
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45
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46 item : comment | instruction | shortcut
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47 item_text : comment | instruction | shortcut | text
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48
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49 # comments, <!-- ... -->
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50 # not sure if it's something to be interpreted specially
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51 # likely an artifact of our dump process
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52
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53 comment : "<!--" <commit> /((?!-->).)*/ms "-->"
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54 { $return = ""; 1; }
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55
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56 # special chars: ', ", {, }, \
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57 # if used in text, they needs to be escaped with backslash
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58
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59 text : quoted | unreserved | "'" | "\""
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60 quoted : "\\" special
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61 { $return = $item{special}; 1; }
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62 special : "'" | "\"" | "\\" | "{" | "}"
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63 unreserved : /[^'"\\{}]/
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64
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65 # shortcuts:
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66 #
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67 # !{xpath-expression} for X:value-of select="xpath-expression";
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68 # !! for X:apply-templates
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69 # !foo() for X:call-template name="foo"
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70
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71 shortcut : double_exclam | exclam_xpath | exclam_name
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72 double_exclam : "!!" <commit> param(s?) ";"
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73 exclam_xpath : "!{" <commit> text(s) "}"
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74 exclam_name : "!" <commit> name "(" param(s?) ")"
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75 name : /[a-z0-9_:-]+/i
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76
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77 param : param_name "=" param_value
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78 param_name : /[a-z0-9_:-]+/i
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79 param_value : "\"" /[^"]*/ "\""
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80
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81 body : ";"
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82 | "{" <commit> item_text(s?) "}"
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83
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84 instructions : xstylesheet | xtransform
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85 | xattributeset | xattribute | xelement
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86 | xparam | xapplytemplates
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87 | xforeach | xchoose | xwhen | xotherwise
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88 | xvalueof | xapplyimports | xnumber
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89 | xoutput | xinclude | ximport | xstripspace | xpreservespace
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90 | xcopyof | xcopy | xtext | xsort | xcomment
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91 | xprocessinginstruction | xdecimalformat | xnamespacealias
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92 | xkey | xfallback | xmessage
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93
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94 instruction : "<%" instruction_simple "%>"
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95 | instruction_simple
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96
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97 instruction_simple : instructions <commit> param(s?) body
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98 | xif
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99 | xtemplate
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100 | xvar
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101
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102 # X:if parameter is test=
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103
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104 xif : "X:if" param_value(?) param(s?) body "else" <commit> body
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105 | "X:if" <commit> param_value(?) param(s?) body
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106
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107 # X:template name(params) = "match" {
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108 # X:template name( bar="init", baz={markup} ) = "match" mode="some" {
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109
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110 xtemplate : "X:template" param_name(?) xtemplate_params(?)
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111 xtemplate_match(?) param(s?) body
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112 xtemplate_params: "(" xtemplate_param ("," xtemplate_param)(s?) ")"
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113 xtemplate_param : param_name ("=" param_value)(?)
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114 xtemplate_match : "=" param_value
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115
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116 # X:var LINK = "/article/@link";
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117 # X:var year = { ... }
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118
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119 xvar : xvar_name <commit> xvar_params
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120 xvar_params : param_name "=" param_value ";"
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121 | param_name "=" body
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122 | <error>
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123
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124 xvar_name : "X:variable"
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125 | "X:var"
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126
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127 # normal instructions
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128
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129 xstylesheet : "X:stylesheet"
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130 xtransform : "X:transform"
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131 xattributeset : "X:attribute-set"
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132 xattribute : "X:attribute"
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133 xelement : "X:element"
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134 xvariable : "X:variable"
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135 xvar : "X:var"
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136 xparam : "X:param"
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Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
137 xapplytemplates : "X:apply-templates"
f082f8c2ebb0 XSLScript: some preliminary grammar, incomplete.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
138 xforeach : "X:for-each"
f082f8c2ebb0 XSLScript: some preliminary grammar, incomplete.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
139 xchoose : "X:choose"
f082f8c2ebb0 XSLScript: some preliminary grammar, incomplete.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
140 xwhen : "X:when"
f082f8c2ebb0 XSLScript: some preliminary grammar, incomplete.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
141 xotherwise : "X:otherwise"
f082f8c2ebb0 XSLScript: some preliminary grammar, incomplete.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
142 xvalueof : "X:value-of"
f082f8c2ebb0 XSLScript: some preliminary grammar, incomplete.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
143 xapplyimports : "X:apply-imports"
f082f8c2ebb0 XSLScript: some preliminary grammar, incomplete.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
144 xnumber : "X:number"
f082f8c2ebb0 XSLScript: some preliminary grammar, incomplete.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
145 xoutput : "X:output"
f082f8c2ebb0 XSLScript: some preliminary grammar, incomplete.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
146 xinclude : "X:include"
f082f8c2ebb0 XSLScript: some preliminary grammar, incomplete.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
147 ximport : "X:import"
f082f8c2ebb0 XSLScript: some preliminary grammar, incomplete.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
148 xstripspace : "X:strip-space"
f082f8c2ebb0 XSLScript: some preliminary grammar, incomplete.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
149 xpreservespace : "X:preserve-space"
f082f8c2ebb0 XSLScript: some preliminary grammar, incomplete.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
150 xcopyof : "X:copy-of"
f082f8c2ebb0 XSLScript: some preliminary grammar, incomplete.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
151 xcopy : "X:copy"
f082f8c2ebb0 XSLScript: some preliminary grammar, incomplete.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
152 xtext : "X:text"
f082f8c2ebb0 XSLScript: some preliminary grammar, incomplete.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
153 xsort : "X:sort"
f082f8c2ebb0 XSLScript: some preliminary grammar, incomplete.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
154 xcomment : "X:comment"
f082f8c2ebb0 XSLScript: some preliminary grammar, incomplete.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
155 xprocessinginstruction : "X:processing-instruction"
f082f8c2ebb0 XSLScript: some preliminary grammar, incomplete.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
156 xdecimalformat : "X:decimal-format"
f082f8c2ebb0 XSLScript: some preliminary grammar, incomplete.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
157 xnamespacealias : "X:namespace-alias"
f082f8c2ebb0 XSLScript: some preliminary grammar, incomplete.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
158 xkey : "X:key"
f082f8c2ebb0 XSLScript: some preliminary grammar, incomplete.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
159 xfallback : "X:fallback"
f082f8c2ebb0 XSLScript: some preliminary grammar, incomplete.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
160 xmessage : "X:message"
f082f8c2ebb0 XSLScript: some preliminary grammar, incomplete.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
161
f082f8c2ebb0 XSLScript: some preliminary grammar, incomplete.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
162 eofile : /^\Z/
f082f8c2ebb0 XSLScript: some preliminary grammar, incomplete.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
163
f082f8c2ebb0 XSLScript: some preliminary grammar, incomplete.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
164 EOF
f082f8c2ebb0 XSLScript: some preliminary grammar, incomplete.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
165
f082f8c2ebb0 XSLScript: some preliminary grammar, incomplete.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
166 ###############################################################################
f082f8c2ebb0 XSLScript: some preliminary grammar, incomplete.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
167
f082f8c2ebb0 XSLScript: some preliminary grammar, incomplete.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
168 my $parser = Parse::RecDescent->new($grammar)
f082f8c2ebb0 XSLScript: some preliminary grammar, incomplete.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
169 or die "Failed to create parser.\n";
f082f8c2ebb0 XSLScript: some preliminary grammar, incomplete.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
170
f082f8c2ebb0 XSLScript: some preliminary grammar, incomplete.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
171 my $lines;
f082f8c2ebb0 XSLScript: some preliminary grammar, incomplete.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
172
f082f8c2ebb0 XSLScript: some preliminary grammar, incomplete.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
173 {
f082f8c2ebb0 XSLScript: some preliminary grammar, incomplete.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
174 local $/;
f082f8c2ebb0 XSLScript: some preliminary grammar, incomplete.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
175 $lines = <>;
f082f8c2ebb0 XSLScript: some preliminary grammar, incomplete.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
176 }
f082f8c2ebb0 XSLScript: some preliminary grammar, incomplete.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
177
f082f8c2ebb0 XSLScript: some preliminary grammar, incomplete.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
178 my $tree = $parser->startrule($lines)
f082f8c2ebb0 XSLScript: some preliminary grammar, incomplete.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
179 or die "Failed to parse $ARGV.\n";
f082f8c2ebb0 XSLScript: some preliminary grammar, incomplete.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
180
f082f8c2ebb0 XSLScript: some preliminary grammar, incomplete.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
181 print Dumper($tree);
f082f8c2ebb0 XSLScript: some preliminary grammar, incomplete.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
182
f082f8c2ebb0 XSLScript: some preliminary grammar, incomplete.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
183 ###############################################################################
f082f8c2ebb0 XSLScript: some preliminary grammar, incomplete.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
184 ###############################################################################