-- Copyright 2006-2018 Mitchell mitchell.att.foicica.com. See License.txt.
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-- VHDL LPeg lexer.
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local lexer = require('lexer')
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local token, word_match = lexer.token, lexer.word_match
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local P, R, S = lpeg.P, lpeg.R, lpeg.S
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local lex = lexer.new('vhdl')
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-- Whitespace.
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lex:add_rule('whitespace', token(lexer.WHITESPACE, lexer.space^1))
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-- Keywords.
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lex:add_rule('keyword', token(lexer.KEYWORD, word_match[[
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access after alias all architecture array assert attribute begin block body
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buffer bus case component configuration constant disconnect downto else elsif
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end entity exit file for function generate generic group guarded if impure in
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inertial inout is label library linkage literal loop map new next null of on
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open others out package port postponed procedure process pure range record
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register reject report return select severity signal shared subtype then to
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transport type unaffected units until use variable wait when while with
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note warning error failure
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and nand or nor xor xnor rol ror sla sll sra srl mod rem
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abs not false true
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]]))
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-- Functions.
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lex:add_rule('function', token(lexer.FUNCTION, word_match[[
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rising_edge shift_left shift_right rotate_left rotate_right resize std_match
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to_integer to_unsigned to_signed unsigned signed to_bit to_bitvector
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to_stdulogic to_stdlogicvector to_stdulogicvector
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]]))
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-- Types.
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lex:add_rule('type', token(lexer.TYPE, word_match[[
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bit bit_vector character boolean integer real time string severity_level
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positive natural signed unsigned line text std_logic std_logic_vector
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std_ulogic std_ulogic_vector qsim_state qsim_state_vector qsim_12state
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qsim_12state_vector qsim_strength mux_bit mux_vectory reg_bit reg_vector
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wor_bit wor_vector
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]]))
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-- Constants.
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lex:add_rule('constant', token(lexer.CONSTANT, word_match[[
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EVENT BASE LEFT RIGHT LOW HIGH ASCENDING IMAGE VALUE POS VAL SUCC VAL POS PRED
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VAL POS LEFTOF RIGHTOF LEFT RIGHT LOW HIGH RANGE REVERSE LENGTH ASCENDING
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DELAYED STABLE QUIET TRANSACTION EVENT ACTIVE LAST LAST LAST DRIVING DRIVING
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SIMPLE INSTANCE PATH
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]]))
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-- Identifiers.
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lex:add_rule('identifier', token(lexer.IDENTIFIER, (lexer.alpha + "'") *
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(lexer.alnum + S("_'"))^1))
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-- Strings.
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local sq_str = lexer.delimited_range("'", true, true)
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local dq_str = lexer.delimited_range('"', true)
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lex:add_rule('string', token(lexer.STRING, sq_str + dq_str))
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-- Comments.
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lex:add_rule('comment', token(lexer.COMMENT, '--' * lexer.nonnewline^0))
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-- Numbers.
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lex:add_rule('number', token(lexer.NUMBER, lexer.float + lexer.integer))
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-- Operators.
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lex:add_rule('operator', token(lexer.OPERATOR, S('=/!:;<>+-/*%&|^~()')))
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return lex
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