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operator precedence changed: assignment like operators are supported; escaping of operators with \ is supported

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Araq 2011-11-09 01:42:05 +01:00
commit 68be801f63
7 changed files with 64 additions and 26 deletions
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38
compiler/parser.nim
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@ -153,20 +153,30 @@ proc IsLeftAssociative(tok: TToken): bool {.inline.} =
proc getPrecedence(tok: TToken): int =
case tok.tokType
of tkOpr:
case tok.ident.s[0]
of '$', '^': result = 9
of '*', '%', '/', '\\': result = 8
of '+', '-', '~', '|': result = 7
of '&': result = 6
of '=', '<', '>', '!': result = 4
of '.': result = 5
else: result = 1
of tkDiv, tkMod, tkShl, tkShr: result = 8
of tkIn, tkNotIn, tkIs, tkIsNot, tkNot, tkOf: result = 4
of tkDotDot: result = 5
of tkAnd: result = 3
of tkOr, tkXor: result = 2
of tkOpr:
var relevantChar = tok.ident.s[0]
var L = tok.ident.s.len
if relevantChar == '\\' and L > 1:
relevantChar = tok.ident.s[1]
template considerAsgn(value: expr) =
result = if tok.ident.s[L-1] == '=': 1 else: value
case relevantChar
of '$', '^': considerAsgn(10)
of '*', '%', '/', '\\': considerAsgn(9)
of '~': result = 8
of '+', '-', '|': considerAsgn(8)
of '&': considerAsgn(7)
of '=', '<', '>', '!': result = 5
of '.': considerAsgn(6)
of '?': result = 2
else: considerAsgn(2)
of tkDiv, tkMod, tkShl, tkShr: result = 9
of tkIn, tkNotIn, tkIs, tkIsNot, tkNot, tkOf: result = 5
of tkDotDot: result = 6
of tkAnd: result = 4
of tkOr, tkXor: result = 3
else: result = - 10
proc isOperator(tok: TToken): bool =