Java 8 Lambda Expression Language Syntax -- Reference: http://cr.openjdk.java.net/~dlsmith/jsr335-0.6.1/B.html
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\begin{figure}[t] | |
\begin{align} | |
L ::=& \; L_P \; \to \; \{ \; L_B \; \} \\ | |
L_P ::=& \; I \; | \; ( \: P_{\mathsf{list}}^? \: ) \; | \; ( \: P_{\mathsf{list}}^i \: ) \\ | |
P_{\mathsf{list}}^i ::=& \; I \; | \; P_{\mathsf{list}}^i \; , \; I \\ | |
L_B ::=& \; E \; | \; K \\ | |
P_{\mathsf{list}} ::=& \; P_{\mathsf{last}} \; | \; P \; , \; P_{\mathsf{last}} \\ | |
P ::=& \; P_{\mathsf{single}} \; | \; P \; , \; P_{\mathsf{single}} \\ | |
P_{\mathsf{single}} ::=& \; F^? \; T \; I \\ | |
P_{\mathsf{last}} ::=& \; F^? \; T... \; I \; | \; P_{\mathsf{single}} \\ | |
M ::=& \; [I.]^? \; I \; ( \; A_{\mathsf{list}}^? \; ) \\ | |
A_{\mathsf{list}} ::=& \; E \; | \; A_{\mathsf{list}} \; , \; E \\ | |
M_{\mathsf{ref}} ::=& \; (C \; | \; I) \; :: \; I \; | \\ | |
::=& \; C \; :: \; \bfjtt{new} | |
\end{align} | |
\caption{ | |
In the above grammar, $L$ is Lambda Expression block in Java; | |
$L_P$ is Lambda's parameters and $L_B$ is Lambda's body; | |
$I$ is a Java identifier; | |
$P_{\mathsf{list}}$ is Java's formal parameter \emph{list}; | |
$P_{\mathsf{list}}^i$ is inferred formal parameter \emph{list}; | |
$E$ is a Java expression and $L$ is \emph{also} an expression; | |
$K$ is Java code block wrapped in \jtt{\{\}}; | |
$P_{\mathsf{last}}$ is the ``last'' formal parameter in which $T...$ refers to Java's \emph{varargs} feature; | |
$P_{\mathsf{single}}$ is a Java formal parameter; | |
$F$ is standard Java variable modifiers such as \jtt{final} or \jtt{static}; | |
$T$ is a Java type; | |
$M$ denotes a method invocation in Java; | |
$A_{\mathsf{list}}$ is the optional argument list; | |
$M_{\mathsf{ref}}$ denotes a method reference in Java 8; | |
$C$ is (possibly) a fully qualified Java class name that introduces the method to be referred to. | |
} | |
\label{fig:java8:syntax} | |
\end{figure} |
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