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Model lexer doesn't handle range correctly #15877

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emberian opened this issue Jul 21, 2014 · 1 comment
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Model lexer doesn't handle range correctly #15877

emberian opened this issue Jul 21, 2014 · 1 comment

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@emberian
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0..2 is

[@0,0:1='0.',<45>,1:0]
[@1,2:2='.',<25>,1:2]
[@2,3:3='2',<44>,1:3]
[@3,4:4='\n',<52>,1:4]
[@4,5:4='<EOF>',<-1>,2:5]

Should be LIT_INTEGER(0) DOTDOT LIT_INTEGER(2)
@emberian
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Another problem: 3.b()

@emberian emberian mentioned this issue Jul 21, 2014
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fhahn added a commit to fhahn/rust that referenced this issue Dec 29, 2014
@fhahn
Handle range in model lexer correctly rust-lang#15877
808945c
@fhahn fhahn mentioned this issue Dec 29, 2014
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alexcrichton added a commit to alexcrichton/rust that referenced this issue Dec 30, 2014
@alexcrichton
rollup merge of rust-lang#20310: fhahn/issue-15877-model-lexer-range
021c2f3 
This patch for rust-lang#15877 uses Antlr's input lookahead (`_input.LA(1) != '.'`) to solve the conflict between the LIT_FLOAT and the range syntax.

Note that in order to execute the grammar tests, rust-lang#20245 should land first.
@fhahn fhahn mentioned this issue Dec 30, 2014
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alexcrichton added a commit to alexcrichton/rust that referenced this issue Dec 31, 2014
@alexcrichton
rollup merge of rust-lang#20330: fhahn/issue-15877-model-lexer-range-2
fa130ae 
This patch resolves the second problem mentioned in rust-lang#15877: function calls to integers, e.g. `3.b()`.

 It does so, by checking whether the character following the first dot of a FLOAT_LIT is a character or an underscore (these should denote a valid identifier). This does not look like a particularly, but it seems like a lookahead of 1 is needed for this distinction.

Another interesting aspect are ranges that start with a integer constant, but end with a function call, e.g. `1..b()`. Rust treats this as a range from 1 to `b()`, but given that `1.` is a valid FLOAT_LIT, `1..b()` could be a function call to a float as well.

cc @cmr
@bors bors closed this as completed in b41a24f Dec 31, 2014
@fhahn fhahn mentioned this issue Jan 14, 2015
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lnicola pushed a commit to lnicola/rust that referenced this issue Jan 3, 2024
@bors
Auto merge of rust-lang#16081 - riverbl:trailing-whitespace, r=Veykril
ee0d99d 
Don't trim trailing whitespace from doc comments

Don't trim trailing whitespace from doc comments as multiple trailing spaces indicates a hard line break in Markdown.

I'd have liked to add a unit test for `docs_from_attrs`, but couldn't find a reasonable way to get an `&Attrs` object for use in the test.

Fixes rust-lang#15877.
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@emberian