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-- Copyright 2020 Karchnu karchnu@karchnu.fr.
-- Zig LPeg lexer.
-- (Based on the C++ LPeg lexer from Mitchell mitchell.att.foicica.com.)
local l = require('lexer')
local token, word_match = l.token, l.word_match
local P, R, S = lpeg.P, lpeg.R, lpeg.S
local M = {_NAME = 'zig'}
-- Whitespace.
local ws = token(l.WHITESPACE, l.space^1)
-- Comments.
local line_comment = '//' * l.nonnewline_esc^0
local comment = token(l.COMMENT, line_comment)
-- For documentation, I took the liberty of using the preprocessor coloration,
-- since it doesn't exist in Zig anyway.
local doc_comment = '///' * l.nonnewline_esc^0
local preprocessor = token(l.PREPROCESSOR, doc_comment)
-- Strings.
local sq_str = P('L')^-1 * l.delimited_range("'", true)
local dq_str = P('L')^-1 * l.delimited_range('"', true)
local string = token(l.STRING, sq_str + dq_str)
-- Numbers.
local number = token(l.NUMBER, l.float + l.integer)
-- Keywords.
local keyword = token(l.KEYWORD, word_match{
-- Keywords.
'inline', 'pub', 'fn', 'comptime', 'const',
'extern', 'return', 'var', 'usingnamespace',
-- Defering code blocks.
'defer', 'errdefer',
-- Functions and structures related keywords.
'align', 'allowzero',
'noalias', 'noinline',
'callconv', 'packed', 'linksection',
'unreachable',
'test',
'asm', 'volatile',
-- Parallelism and concurrency related keywords.
'async', 'await', 'noasync',
'suspend', 'nosuspend', 'resume',
'threadlocal','anyframe',
-- Control flow: conditions and loops.
'if', 'else', 'orelse',
'or', 'and',
'while', 'for', 'switch', 'continue', 'break',
'catch', 'try',
-- Not keyword, but overly used variable name with always the same semantic.
'self',
})
-- Types.
local type = token(l.TYPE, word_match{
'enum', 'struct', 'union',
'i8', 'u8', 'i16', 'u16', 'i32', 'u32', 'i64', 'u64', 'i128', 'u128',
'isize', 'usize',
'c_short', 'c_ushort', 'c_int', 'c_uint',
'c_long', 'c_ulong', 'c_longlong', 'c_ulonglong', 'c_longdouble',
'c_void',
'f16', 'f32', 'f64', 'f128',
'bool',
'void',
'noreturn',
'type', 'anytype', 'error', 'anyerror',
'comptime_int', 'comptime_float',
})
-- Constants.
local constant = token(l.CONSTANT, word_match{
-- special values
'false', 'true', 'null', 'undefined',
})
-- Identifiers.
local identifier = token(l.IDENTIFIER, l.word)
-- Built-in functions.
local functions = token(l.FUNCTION, word_match{
'addWithOverflow', 'alignCast', 'alignOf', 'as', 'asyncCall', 'atomicLoad', 'atomicRmw',
'atomicStore', 'bitCast', 'bitOffsetOf', 'boolToInt', 'bitSizeOf', 'breakpoint', 'mulAdd',
'byteSwap', 'bitReverse', 'byteOffsetOf', 'call', 'cDefine', 'cImport', 'cInclude', 'clz',
'cmpxchgStrong', 'cmpxchgWeak', 'compileError', 'compileLog', 'ctz', 'cUndef', 'divExact',
'divFloor', 'divTrunc', 'embedFile', 'enumToInt', 'errorName', 'errorReturnTrace',
'errorToInt', 'errSetCast', 'export', 'fence', 'field', 'fieldParentPtr', 'floatCast',
'floatToInt', 'frame', 'Frame', 'frameAddress', 'frameSize', 'hasDecl', 'hasField', 'import',
'intCast', 'intToEnum', 'intToError', 'intToFloat', 'intToPtr', 'memcpy', 'memset', 'wasmMemorySize',
'wasmMemoryGrow', 'mod', 'mulWithOverflow', 'panic', 'popCount', 'ptrCast', 'ptrToInt', 'rem',
'returnAddress', 'setAlignStack', 'setCold', 'setEvalBranchQuota', 'setFloatMode', 'setRuntimeSafety',
'shlExact', 'shlWithOverflow', 'shrExact', 'shuffle', 'sizeOf', 'splat', 'reduce',
'src', 'sqrt', 'sin', 'cos', 'exp', 'exp2', 'log', 'log2', 'log10', 'fabs', 'floor',
'ceil', 'trunc', 'round', 'subWithOverflow', 'tagName', 'TagType', 'This', 'truncate',
'Type', 'typeInfo', 'typeName', 'TypeOf', 'unionInit',
})
-- Operators.
local operator = token(l.OPERATOR, S('+-/*%<>!=^&|?~:;,.()[]{}'))
M._rules = {
{'whitespace', ws},
{'keyword', keyword},
{'constant', constant},
{'function', functions},
{'type', type},
{'identifier', identifier},
{'string', string},
{'preprocessor', preprocessor},
{'comment', comment},
{'number', number},
{'operator', operator},
}
M._foldsymbols = {
_patterns = {'%l+', '[{}]', '/%*', '%*/', '//'},
[l.OPERATOR] = {['{'] = 1, ['}'] = -1},
[l.COMMENT] = {['//'] = l.fold_line_comments('//')}
}
return M
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