Full parser examples with parsec?

Hmm Expr> parse expr "" "a(6)" Right (FuncCall "a" Number 6.0) that part works for me after filling out the missing pieces Edit: I filled out the missing pieces by writing my own float parser, which could parse integer literals. The float parser from Text.Parsec. Token on the other hand, only parses literals with a fraction part or an exponent, so it failed parsing the "6 However Expr> parse expr "" "variable" Left (line 1, column 9): unexpected end of input expecting "( when call fails after having parsed an identifier, that part of the input is consumed, hence ident isn't tried, and the overall parse fails.

You can a) make it try call in the choice list of expr so that call fails without consuming input, or b) write a parser callOrIdent to use in expr e. G callOrIdent = do name return (Identifier name) which avoids try and thus may perform better.

Hmm, *Expr> parse expr "" "a(6)" Right (FuncCall "a" Number 6.0) that part works for me after filling out the missing pieces. Edit: I filled out the missing pieces by writing my own float parser, which could parse integer literals. The float parser from Text.Parsec.

Token on the other hand, only parses literals with a fraction part or an exponent, so it failed parsing the "6". However, *Expr> parse expr "" "variable" Left (line 1, column 9): unexpected end of input expecting "(" when call fails after having parsed an identifier, that part of the input is consumed, hence ident isn't tried, and the overall parse fails. You can a) make it try call in the choice list of expr, so that call fails without consuming input, or b) write a parser callOrIdent to use in expr, e.g. CallOrIdent = do name return (Identifier name) which avoids try and thus may perform better.

I use the lexer functions of Text.Parsec. Token for identifier, etc. For some reason, I get entirely different parsing results for the code you give me. – Scán Nov 21 at 21:54 @Scán ah, the float parser of Token doesn't parse integer literals, you'd have to write a(6.0) or similar.

But apart from that, it behaves like the above, more or less. – Daniel Fischer Nov 21 at 22:13 ... I feel dumb now. Thanks!

(I'd still wish for those full examples) – Scán Nov 21 at 22:16 Maybe pugscode. Org will help you! – z_axis 16 May1 at 2:35.

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