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| author | buraq <buraq@epfl.ch> | 2003-07-17 16:12:45 +0000 |
|---|---|---|
| committer | buraq <buraq@epfl.ch> | 2003-07-17 16:12:45 +0000 |
| commit | 0715852a2ecbe5bc8b0bf03b13a24a79d1e7105a (patch) | |
| tree | 9100c00b0aee45386b0351bc738ddcc0d21a0816 /doc | |
| parent | 14143d5b3e13e0341d2447c9ccea591cdcb2e4c4 (diff) | |
| download | scala-0715852a2ecbe5bc8b0bf03b13a24a79d1e7105a.tar.gz scala-0715852a2ecbe5bc8b0bf03b13a24a79d1e7105a.tar.bz2 scala-0715852a2ecbe5bc8b0bf03b13a24a79d1e7105a.zip | |
rules for Pattern in grammar in appendix
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/reference/reference.verb.tex | 38 |
1 files changed, 17 insertions, 21 deletions
diff --git a/doc/reference/reference.verb.tex b/doc/reference/reference.verb.tex index 54bcf8b8af..0455421fe5 100644 --- a/doc/reference/reference.verb.tex +++ b/doc/reference/reference.verb.tex @@ -189,6 +189,8 @@ inherited abstract members. translated to method calls of their operand. } +% 16 Jul 2003 Regular pattern matching (Chapter 8) + \subsection*{Status of This Document} The present document defines slightly more than what is implemented in @@ -3066,18 +3068,6 @@ SimplePattern \=::= \> varid [ '@' SimplePattern ] Patterns \>::= \> Pattern {`,' Pattern} \end{verbatim} -%% \syntax\begin{verbatim} -%% Pattern \=::= \= SimplePattern {Id SimplePattern} -%% \> | \> varid `:' Type -%% \> | \> `_' `:' Type -%% SimplePattern \>::= \> varid -%% \> | \> `_' -%% \> | \> literal -%% \> | \> StableId {`(' [Patterns] `)'} -%% \> | \> `(' [Patterns] `)' -%% \> | \> `[' [Patterns] `]' -%% Patterns \>::= \> Pattern {`,' Pattern} -%% \end{verbatim} A pattern is built from constants, constructors, variables and regular operators. Pattern matching tests whether a given value (sequence @@ -4272,15 +4262,21 @@ grammar. Constr \>::=\> StableId [TypeArgs] [`(' [Exprs] `)'] - Pattern \>::=\> varid `:' Type1 - \> |\> `_' `:' Type1 - \> |\> SimplePattern {Id SimplePattern} - SimplePattern \>::=\> varid - \> |\> `_' - \> |\> literal - \> |\> StableId [`(' [Patterns] `)'] - \> |\> `(' [Pattern] `)' - Patterns \>::=\> Pattern {`,' Pattern} + Pattern \>::= \= TreePattern { `|' TreePattern } + + TreePattern \>::= \> varid `:' Type + \> | \> `_' `:' Type + \> | \> SimplePattern [ '*' | '?' | '+' ] + \> | \> SimplePattern { Id SimplePattern } + + SimplePattern \>::= \> varid [ '@' SimplePattern ] + \> | \> `_' + \> | \> literal + \> | \> StableId [ `(' [Patterns] `)' ] + \> | \> `(' Patterns `)' + \> | \> + + Patterns \>::= \> Pattern {`,' Pattern} TypeParamClause \>::=\> `[' TypeParam {`,' TypeParam} `]' FunTypeParamClause \>::=\> `[' TypeDcl {`,' TypeDcl} `]' |