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91 lines
1.7 KiB
ObjectPascal
91 lines
1.7 KiB
ObjectPascal
%token space \s+
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// Symbols
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%token parenthese_ \(
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%token _parenthese \)
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%token bracket_ \[
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%token _bracket \]
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// Strings
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%token quote_ " -> string
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%token string:quoted [^"]+
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%token string:_quote " -> default
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%token colon :
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// Operators
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%token in IN
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%token and AND
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%token or OR
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%token except EXCEPT
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// Rest
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%token collection collection
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%token word [^\s\(\)\[\]]+
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// relative order of precedence is NOT > XOR > AND > OR
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#query:
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::space::? primary()? ::space::?
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primary:
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secondary() ( ::space:: ::except:: ::space:: primary() #except )?
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secondary:
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ternary() ( ::space:: ::or:: ::space:: primary() #or )?
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ternary:
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quaternary() ( ::space:: ::and:: ::space:: primary() #and )?
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quaternary:
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collection_filter() #collection | quinary()
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collection_filter:
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::collection:: ::colon:: string()
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quinary:
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( group() #group | term() ) ( ::space:: ::in:: ::space:: string() #in )?
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group:
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::space::? ::parenthese_:: primary() ::_parenthese:: ::space::?
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term:
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( bracketed_text() #thesaurus_term )
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| ( text() #text )
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bracketed_text:
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::bracket_:: text() ::_bracket::
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text:
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string_keyword_symbol()
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( <space>? string_keyword_symbol() )*
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( ::space::? context() )?
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string_keyword_symbol:
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string()
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| keyword()
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| symbol()
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#context:
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::parenthese_:: string()+ ::_parenthese::
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string:
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<word>
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| quoted_string()
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quoted_string:
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::quote_:: <quoted> ::_quote::
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keyword:
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<in>
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| <except>
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| <and>
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| <or>
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| <collection>
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symbol:
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::parenthese_::
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| ::_parenthese::
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| ::bracket_::
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| ::_bracket::
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| ::colon::
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