72 lines
1.5 KiB
C++
72 lines
1.5 KiB
C++
#pragma once
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#include "cypher.h"
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#include "lexer.hpp"
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class CypherLexer : public Lexer
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{
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public:
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CypherLexer()
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{
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// whitespace
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rule("\\s+", sm.skip());
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// special characters
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rule("\\.", TK_DOT);
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rule(",", TK_COMMA);
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rule(":", TK_COLON);
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rule("\\|", TK_PIPE);
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rule("\\{", TK_LCP);
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rule("\\}", TK_RCP);
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rule("\\(", TK_LP);
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rule("\\)", TK_RP);
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rule("\\[", TK_LSP);
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rule("\\]", TK_RSP);
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// operators
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rule("\\+", TK_PLUS);
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rule("-", TK_MINUS);
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rule("\\*", TK_STAR);
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rule("\\/", TK_SLASH);
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rule("%", TK_REM);
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rule(">", TK_GT);
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rule("<", TK_LT);
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rule(">=", TK_GE);
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rule("<=", TK_LE);
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rule("=", TK_EQ);
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rule("<>", TK_NE);
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// constants
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rule("(?i:TRUE)", TK_BOOL);
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rule("(?i:FALSE)", TK_BOOL);
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// keywords
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rule("(?i:MATCH)", TK_MATCH);
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rule("(?i:WHERE)", TK_WHERE);
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rule("(?i:RETURN)", TK_RETURN);
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rule("(?i:CREATE)", TK_CREATE);
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rule("(?i:DISTINCT)", TK_DISTINCT);
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rule("(?i:AND)", TK_AND);
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rule("(?i:OR)", TK_OR);
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// string literal TODO single quote escape
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rule("'(.*?)'", TK_STR);
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// string literal TODO double quote escape
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rule("\\\"(.*?)\\\"", TK_STR);
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// number
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rule("\\d+", TK_INT);
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rule("\\d*[.]?\\d+", TK_FLOAT);
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// identifier
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rule("[_a-zA-Z][_a-zA-Z0-9]{0,30}", TK_IDN);
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build();
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}
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};
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