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.\" ========================================================================
.\"
.IX Title "Text::Query::Parse 3"
.TH Text::Query::Parse 3 "2020-07-07" "perl v5.32.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH "NAME"
Text::Query::Parse \- Base class for query parsers
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&    package Text::Query::ParseThisSyntax;
\&
\&    use Text::Query::Parse;
\&    
\&    use vars qw(@ISA);
\&
\&    @ISA = qw(Text::Query::Parse);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This module provides a virtual base class for query parsers.
.PP
It defines the \f(CW\*(C`prepare\*(C'\fR method that is called by the \f(CW\*(C`Text::Query\*(C'\fR
object to compile the query string.
.SH "MEMBERS"
.IX Header "MEMBERS"
.IP "\fB\-build\fR Pointer to a Text::Query::Build object." 4
.IX Item "-build Pointer to a Text::Query::Build object."
.PD 0
.IP "\fBscope\fR Scope stack. Defines the context in which the query must be solved." 4
.IX Item "scope Scope stack. Defines the context in which the query must be solved."
.ie n .IP "\fBtoken\fR The current token. Destroyed by ""prepare""." 4
.el .IP "\fBtoken\fR The current token. Destroyed by \f(CWprepare\fR." 4
.IX Item "token The current token. Destroyed by prepare."
.ie n .IP "\fBtokens\fR A reference to the list of all the tokens. Filled by parse_tokens. Destroyed by ""prepare""." 4
.el .IP "\fBtokens\fR A reference to the list of all the tokens. Filled by parse_tokens. Destroyed by \f(CWprepare\fR." 4
.IX Item "tokens A reference to the list of all the tokens. Filled by parse_tokens. Destroyed by prepare."
.ie n .IP "\fBparseopts\fR A reference to a hash table containing all the parameters given to the ""prepare"" function." 4
.el .IP "\fBparseopts\fR A reference to a hash table containing all the parameters given to the \f(CWprepare\fR function." 4
.IX Item "parseopts A reference to a hash table containing all the parameters given to the prepare function."
.IP "\fB\-verbose\fR Integer indicating the desired verbose level." 4
.IX Item "-verbose Integer indicating the desired verbose level."
.PD
.SH "METHODS"
.IX Header "METHODS"
.IP "prepare (\s-1QSTRING\s0 [\s-1OPTIONS\s0])" 4
.IX Item "prepare (QSTRING [OPTIONS])"
Compiles the query expression in \f(CW\*(C`QSTRING\*(C'\fR to internal form and sets any 
options. First calls \f(CW\*(C`build_init\*(C'\fR to reset the builder and destroy the
\&\f(CW\*(C`token\*(C'\fR and \f(CW\*(C`tokens\*(C'\fR members. Then calls \f(CW\*(C`parse_tokens\*(C'\fR to fill 
the \f(CW\*(C`tokens\*(C'\fR member. Then calls \f(CW\*(C`expression\*(C'\fR to use the tokens from 
\&\f(CW\*(C`tokens\*(C'\fR. The \f(CW\*(C`expression\*(C'\fR is expected to call the \f(CW\*(C`build_*\*(C'\fR functions
to build the compiled expression. At last calls \f(CW\*(C`build_final_expression\*(C'\fR
with the result of \f(CW\*(C`expression\*(C'\fR.
.Sp
A derived parser must redefine this function to define default values for
specific options.
.IP "expression ()" 4
.IX Item "expression ()"
Must be redefined by derived package. Returns the internal form of the
question built from \f(CW\*(C`build_*\*(C'\fR functions using the \f(CW\*(C`tokens\*(C'\fR.
.IP "parse_tokens (\s-1QSTRING\s0)" 4
.IX Item "parse_tokens (QSTRING)"
Must be redefined by derived package. Parses the \f(CW\*(C`QSTRING\*(C'\fR scalar
and fills the \f(CW\*(C`tokens\*(C'\fR member with lexical units.
.IP "build_*" 4
.IX Item "build_*"
Shortcuts to the corresponding function of the Text::Query::Build object
found in the \f(CW\*(C`\-build\*(C'\fR member.
.SH "OPTIONS"
.IX Header "OPTIONS"
These are the options of the \f(CW\*(C`prepare\*(C'\fR method and the constructor.
.IP "\-quotes defaults to \e'\e""" 4
.IX Item "-quotes defaults to '"""
Defines the quote characters.
.IP "\-case defaults to 0" 4
.IX Item "-case defaults to 0"
If true, do case-sensitive match.
.IP "\-litspace defaults to 0" 4
.IX Item "-litspace defaults to 0"
If true, match spaces (except between operators) in 
\&\f(CW\*(C`QSTRING\*(C'\fR literally.  If false, match spaces as \f(CW\*(C`\es+\*(C'\fR.
.IP "\-regexp defaults to 0" 4
.IX Item "-regexp defaults to 0"
If true, treat patterns in \f(CW\*(C`QSTRING\*(C'\fR as regular expressions 
rather than literal text.
.IP "\-whole defaults to 0" 4
.IX Item "-whole defaults to 0"
If true, match whole words only, not substrings of words.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBText::Query\fR\|(3)
.SH "AUTHORS"
.IX Header "AUTHORS"
Eric Bohlman (ebohlman@netcom.com)
.PP
Loic Dachary (loic@senga.org)