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syntax: introducing %gprec for precedence groups

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It is now possible to introduce precedence groups, with precedence
relationships inside the group, but not with the outside tokens.  Ex:

%gprec arith {
  %left '+' '-'
  %left '*' '/'
  %right '^'
}

%gprec {
  %left OR
  %left AND
}

%left OTHER
%precedence OTHER2

Here, the arithmetical operators (in the "arith" group) can be compared, the
boolean operators can be compared, but OTHER can only be compared to OTHER2.

* src/gram.c, src/gram.h, src/scan-gram.l, src/parse-gram.y: {} blocks after
%gprec are understood by the lexer
* src/parse-gram.y: New syntax
* tests/input.at, tests/regression.at: Fix due to lexer change
This commit is contained in:
Valentin Tolmer
2013-08-01 14:54:30 +02:00
parent 2d8fc07778
commit f8a710c6f4
6 changed files with 59 additions and 4 deletions
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3
tests/input.at
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@@ -64,14 +64,13 @@ AT_CHECK([[$PERL -pi -e 's/\\(\d{3})/chr(oct($1))/ge' input.y || exit 77]])
AT_BISON_CHECK([input.y], [1], [],
[[input.y:1.1-2: error: invalid characters: '\0\001\002\377?'
input.y:3.1: error: invalid character: '?'
input.y:4.14: error: invalid character: '}'
input.y:4.14: error: syntax error, unexpected }
input.y:5.1: error: invalid character: '%'
input.y:5.2: error: invalid character: '&'
input.y:6.1-17: error: invalid directive: '%a-does-not-exist'
input.y:7.1: error: invalid character: '%'
input.y:7.2: error: invalid character: '-'
input.y:8.1-9.0: error: missing '%}' at end of file
input.y:8.1-9.0: error: syntax error, unexpected %{...%}
]])
AT_CLEANUP

3
tests/regression.at
View File

@@ -405,14 +405,13 @@ default: 'a' }
AT_BISON_CHECK([input.y], [1], [],
[[input.y:2.1: error: invalid character: '?'
input.y:3.14: error: invalid character: '}'
input.y:3.14: error: syntax error, unexpected }
input.y:4.1: error: invalid character: '%'
input.y:4.2: error: invalid character: '&'
input.y:5.1-17: error: invalid directive: '%a-does-not-exist'
input.y:6.1: error: invalid character: '%'
input.y:6.2: error: invalid character: '-'
input.y:7.1-8.0: error: missing '%}' at end of file
input.y:7.1-8.0: error: syntax error, unexpected %{...%}
]])
AT_CLEANUP