1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN" "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd" [
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3 | <!ENTITY % general-entities SYSTEM "../general.ent">
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4 | %general-entities;
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5 | ]>
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6 | <sect1 id="ch-system-flex" xreflabel="Flex" role="wrap">
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7 | <title>Flex-&flex-version;</title>
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8 | <?dbhtml filename="flex.html"?>
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9 |
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10 | <indexterm zone="ch-system-flex"><primary sortas="a-Flex">Flex</primary></indexterm>
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11 |
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12 | <sect2 role="package"><title/>
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13 | <para>The Flex package contains a utility for generating programs that
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14 | recognize patterns in text.</para>
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15 |
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16 | <segmentedlist>
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17 | <segtitle>&buildtime;</segtitle>
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18 | <segtitle>&diskspace;</segtitle>
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19 | <seglistitem><seg>0.1 SBU</seg><seg>3.4 MB</seg></seglistitem>
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20 | </segmentedlist>
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21 |
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22 | <segmentedlist>
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23 | <segtitle>Flex installation depends on</segtitle>
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24 | <seglistitem><seg>Bash, Binutils, Bison, Coreutils, Diffutils,
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25 | GCC, Gettext, Glibc, Grep, M4, Make, Sed</seg></seglistitem>
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26 | </segmentedlist>
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27 | </sect2>
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28 |
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29 | <sect2 role="installation">
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30 | <title>Installation of Flex</title>
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31 |
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32 | <para>Flex contains several known bugs. Fix these with the following patch:</para>
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33 |
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34 | <screen><userinput>patch -Np1 -i ../flex-&flex-version;-debian_fixes-2.patch</userinput></screen>
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35 |
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36 | <para>The GNU autotools detects that the Flex source code has been modified by
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37 | the previous patch, and tries to update the manual page accordingly, but this
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38 | breaks on many systems, and the default page is fine, so make sure it doesn't
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39 | get renegerated:</para>
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40 |
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41 | <screen><userinput>touch doc/flex.1</userinput></screen>
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42 |
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43 | <para>Now prepare Flex for compilation:</para>
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44 |
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45 | <screen><userinput>./configure --prefix=/usr</userinput></screen>
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46 |
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47 | <para>Compile the package:</para>
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48 |
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49 | <screen><userinput>make</userinput></screen>
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50 |
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51 | <para>To test the results, issue:
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52 | <userinput>make check</userinput>.</para>
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53 |
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54 | <para>Now install the package:</para>
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55 |
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56 | <screen><userinput>make install</userinput></screen>
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57 |
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58 | <para>There are some packages that expect to find the <emphasis>lex</emphasis>
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59 | library in <filename>/usr/lib</filename>. Create a symlink to account for
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60 | this:</para>
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61 |
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62 | <screen><userinput>ln -s libfl.a /usr/lib/libl.a</userinput></screen>
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63 |
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64 | <para>A few programs don't know about <command>flex</command> yet and try
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65 | to run its predecessor <command>lex</command>. To support those programs,
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66 | create a wrapper script named <filename>lex</filename> that calls
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67 | <command>flex</command> in <emphasis>lex</emphasis> emulation mode:</para>
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68 |
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69 | <screen><userinput>cat > /usr/bin/lex << "EOF"</userinput>
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70 | #!/bin/sh
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71 | # Begin /usr/bin/lex
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72 |
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73 | exec /usr/bin/flex -l "$@"
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74 |
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75 | # End /usr/bin/lex
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76 | <userinput>EOF
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77 | chmod 755 /usr/bin/lex</userinput></screen>
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78 |
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79 | </sect2>
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80 |
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81 |
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82 | <sect2 id="contents-flex" role="content"><title>Contents of Flex</title>
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83 |
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84 | <segmentedlist>
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85 | <segtitle>Installed programs</segtitle>
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86 | <segtitle>Installed library</segtitle>
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87 | <seglistitem><seg>flex, flex++ (link to flex) and lex</seg>
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88 | <seg>libfl.a</seg></seglistitem>
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89 | </segmentedlist>
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90 |
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91 | <variablelist><title>Short descriptions</title>
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92 |
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93 | <varlistentry id="flex">
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94 | <term><command>flex</command></term>
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95 | <listitem>
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96 | <indexterm zone="ch-system-flex flex"><primary sortas="b-flex">flex</primary></indexterm>
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97 | <para>is a tool for generating programs that
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98 | recognize patterns in text. Pattern recognition is useful in many applications.
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99 | From a set of rules on what to look for, <command>flex</command> makes a program that looks for
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100 | those patterns. The reason to use <command>flex</command> is that it is much easier to specify
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101 | the rules for a pattern-finding program than to write the program.</para>
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102 | </listitem>
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103 | </varlistentry>
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104 |
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105 | <varlistentry id="flex-">
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106 | <term><command>flex++</command></term>
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107 | <listitem>
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108 | <indexterm zone="ch-system-flex flex-"><primary sortas="b-flex++">flex++</primary></indexterm>
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109 | <para>invokes a version of <command>flex</command> that is used exclusively for C++ scanners.</para>
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110 | </listitem>
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111 | </varlistentry>
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112 |
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113 | <varlistentry id="libfl.a">
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114 | <term><filename class="libraryfile">libfl.a</filename></term>
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115 | <listitem>
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116 | <indexterm zone="ch-system-flex libfl.a"><primary sortas="c-libfl.a">libfl.a</primary></indexterm>
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117 | <para>is the flex library.</para>
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118 | </listitem>
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119 | </varlistentry>
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120 | </variablelist>
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121 |
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122 | </sect2>
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123 |
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124 | </sect1>
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