我有一个包含许多简单函数的Groovy文件,如下所示:
// useful functions
def myFunc1(String arg) {
println("Hello " + arg)
}
def myFunc2(String arg) {
println("Goodbye " + arg)
}
我想从中获得:
(所有这些都是简单的字符串,我不需要运行任何东西。)
我正准备使用一些Regexing,但由于我使用的是JVM语言(Scala),我想我可以使用一些Groovy编译器的东西来做这个“更好”的方式。
似乎有很多关于动态加载Groovy代码并运行它的信息,但在内省源代码方面却没有那么多。有什么想法吗?
(以“不错”的方式失败,我也会接受一些Scala-foo以简洁的方式解析信息。)
答案 0 :(得分:6)
这有效,并演示了在AST中查找每个重要节点所需的令牌类型。希望它有意义......通过使用大量的Groovy动态,我希望我没有让Scala的端口变得太难: - (
import org.codehaus.groovy.antlr.*
import org.codehaus.groovy.antlr.parser.*
import static org.codehaus.groovy.antlr.parser.GroovyTokenTypes.*
def code = '''
// useful functions
def myFunc1(String arg) {
println("Hello " + arg)
}
def myFunc2(arg, int arg2) {
println("Goodbye " + arg)
}
public String stringify( int a ) {
"$a"
}
'''
def lines = code.split( '\n' )
// Generate a GroovyRecognizer, compile an AST and assign it to 'ast'
def ast = new SourceBuffer().with { buff ->
new UnicodeEscapingReader( new StringReader( code ), buff ).with { read ->
read.lexer = new GroovyLexer( read )
GroovyRecognizer.make( read.lexer ).with { parser ->
parser.sourceBuffer = buff
parser.compilationUnit()
parser.AST
}
}
}
// Walks the ast looking for types
def findByPath( ast, types, multiple=false ) {
[types.take( 1 )[ 0 ],types.drop(1)].with { head, tail ->
if( tail ) {
findByPath( ast*.childrenOfType( head ).flatten(), tail, multiple )
}
else {
ast*.childrenOfType( head ).with { ret ->
multiple ? ret[ 0 ] : ret.head()[0]
}
}
}
}
// Walk through the returned ast
while( ast ) {
def methodModifier = findByPath( ast, [ MODIFIERS ] ).firstChild?.toStringTree() ?: 'public'
def returnType = findByPath( ast, [ TYPE, IDENT ] ) ?: 'Object'
def methodName = findByPath( ast, [ IDENT ] )
def body = findByPath( ast, [ SLIST ] )
def parameters = findByPath( ast, [ PARAMETERS, PARAMETER_DEF ], true ).collect { param ->
[ type: findByPath( param, [ TYPE ] ).firstChild?.toStringTree() ?: 'Object',
name: findByPath( param, [ IDENT ] ) ]
}
def (y1,y2,x1,x2) = [ body.line - 1, body.lineLast - 1, body.column - 1, body.columnLast ]
// Grab the text from the original string
def snip = [ lines[ y1 ].drop( x1 ), // First line prefix stripped
*lines[ (y1+1)..<y2 ], // Mid lines
lines[ y2 ].take( x2 ) ].join( '\n' ) // End line suffix stripped
println '------------------------------'
println "modifier: $methodModifier"
println "returns: $returnType"
println "name: $methodName"
println "params: $parameters"
println "$snip\n"
// Step to next branch and repeat
ast = ast.nextSibling
}
打印出来:
------------------------------
modifier: public
returns: Object
name: myFunc1
params: [[type:String, name:arg]]
{
println("Hello " + arg)
}
------------------------------
modifier: public
returns: Object
name: myFunc2
params: [[type:Object, name:arg], [type:int, name:arg2]]
{
println("Goodbye " + arg)
}
------------------------------
modifier: public
returns: String
name: stringify
params: [[type:int, name:a]]
{
"$a"
}
希望它有所帮助,或指向正确的方向: - )