Ssurgeon (Stanford JavaNLP API)

java.lang.Object
- edu.stanford.nlp.semgraph.semgrex.ssurgeon.Ssurgeon

```
public class Ssurgeon
extends java.lang.Object
```
This is the primary class for loading and saving out Ssurgeon patterns. This is also the class that maintains the current list of resources loaded into Ssurgeon: any pattern loaded can reference these resources.
An Ssurgeon can be built from an XML pattern or by assembling the pieces by hand.
The XML format is as follows:
```
<ssurgeon-pattern-list>
  <ssurgeon-pattern>
    <uid>...</uid>
    <notes>...</notes>
    <semgrex>...</semgrex>
    <language>...</language>
    <edit-list>...</edit-list>
  </ssurgeon-pattern>
</ssurgeon-pattern-list>
```
The id is the id of the Ssurgeon operation.
The notes are comments on the Ssurgeon.
The semgrex is a Semgrex pattern to use when matching for this operation.
The edit-list is the actual Ssurgeon operation to execute.
The language is an optional field to determine what language formalism to use when making new dependencies. By default it will be English for SD when using the Java API, although most people probably want UniversalEnglish for UD (including non-English UD datasets)

Below, edge means an edge in the Semgrex results, and node refers to a matched word.
Available operations and their arguments include:
- addEdge -gov node1 -dep node2 -reln depType -weight 0.5
- relabelNamedEdge -edge edgename -reln depType
- removeEdge -gov node1 -dep node2 reln depType
- removeNamedEdge -edge edgename
- reattachNamedEdge -edge edgename -gov gov -dep dep
- addDep -gov node1 -reln depType -position where ...attributes...
- editNode -node node ...attributes...
- setRoots n1 (n2 n3 ...)
- mergeNodes n1 n2
- killAllIncomingEdges -node node
- delete -node node
- deleteLeaf -node node
- killNonRootedNodes
addEdge adds a new edge between two existing nodes. -gov and -dep will be nodes matched by the Semgrex pattern. -reln is the name of the dependency type to add.
relabelNamedEdge changes the dependency type of a named edge. edge is the name of the edge in the Semgrex pattern. -reln is the name of the dependency type to use.
removeEdge deletes an edge based on its description. -gov is the governor to delete, a named node from the Semgrex pattern. -dep is the dependent to delete, a named node from the Semgrex pattern. -reln is the name of the dependency to delete. If -gov or -dep are left empty, then all (matching) edges to or from the remaining argument will be deleted.
removeNamedEdge deletes an edge based on its name. edge is the name of the edge in the Semgrex pattern.
reattachNamedEdge changes an edge's gov and/or dep based on its name. edge is the name of the edge in the Semgrex pattern. -gov is the governor to attach to, a named node from the Semgrex pattern. If left blank, no edit. -dep is the dependent to attach to, a named node from the Semgrex pattern. If left blank, no edit. At least one of -gov or -dep must be set.
addDep adds a word and a dependency arc to the dependency graph. -gov is the governor to attach to, a named node from the Semgrex pattern. -reln is the name of the dependency type to use. -position is where in the sentence the word should go. - will be the first word of the sentence, + will be the last word of the sentence, and -node or +node will be before or after the named node. ...attributes... means any attributes which can be set from a string or numerical value eg -text ... sets the text of the word -pos ... sets the xpos of the word, -cpos ... sets the upos of the word, etc. You cannot set the index of a word this way; an exception will be thrown. To put whitespace in an attribute, you can quote it. So, for example, a Vietnamese word can be set as -word "xin chào"
editNode will edit the attributes of a word. -node is the node to edit. ...attributes... are the attributes to change, same as with addDep
combineMWT will add MWT attributes to a sequence of two or more words. -node (repeated) is the nodes to edit. -word is the optional text to use for the new MWT. If not set, the words will be concatenated.
setRoots sets the roots of the sentence to a new root. n1, n2, ... are the names of the nodes from the Semgrex to use as the root(s). This is best done in conjunction with other operations which actually manipulate the structure of the graph, or the new root will weirdly have dependents and the graph will be incorrect.
mergeNodes will merge n1 and n2, assuming they are mergeable. The nodes can be merged if one of the nodes is the head of a phrase and the other node depends on the head. TODO: can make it process more than two nodes at once.
killAllIncomingEdges deletes all edges to a node. -node is the node to edit. Note that this is the same as removeEdge with only the dependent set.
delete deletes all nodes reachable from a specific node. -node is the node to delete. You will only want to do this after separating the node from the parts of the graph you want to keep.
deleteLeaf deletes a node as long as it is a leaf. -node is the node to delete. If the node is not a leaf (no outgoing edges), it will not be deleted.
killNonRootedNodes searches the graph and deletes all nodes which have no path to a root.

A practical example comes from the UD_English-Pronouns dataset, where some words had both nsubj and csubj dependencies:
```
1       Hers    hers    PRON    PRP     Gender=Fem|Number=Sing|Person=3|Poss=Yes|PronType=Prs   3       nsubj   _       _
2       is      be      AUX     VBZ     Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin   3       cop     _       _
3       easy    easy    ADJ     JJ      Degree=Pos      0       root    _       _
4       to      to      PART    TO      _       5       mark    _       _
5       clean   clean   VERB    VB      VerbForm=Inf    3       csubj   _       SpaceAfter=No
6       .       .       PUNCT   .       _       5       punct   _       _
```
We can update this with the following Semgrex/Ssurgeon pair:
```
{}=source >nsubj {} >csubj=bad {}
relabelNamedEdge -edge bad -reln advcl
```
The result will be the csubj updated to advcl
For the most part, each of these operations is already bomb-proof, eg the pattern will execute once and not repeat on the same part of the same dependency graph. However, in the case of addDep, it is not possible to automatically bomb-proof the command, as certain sentences may legitimately have multiple words with the same attributes as dependents of the same governor. In this case, it is necessary to make the Semgrex pattern itself bomb-proof.
As an example, if the intent is to change "Jennifer has lovely antennae" to "Jennifer has lovely blue antennae", the following command would "bomb":
```
  {word:antennae}=antennae
  addDep -gov antennae -reln dep -word blue
```
The following would not:
```
  {word:antennae}=antennae !> {word:blue}
  addDep -gov antennae -reln dep -word blue
```
Author:

Eric Yeh

Nested Class Summary

Nested Classes
Modifier and Type Class and Description

static class Ssurgeon.ArgsBox

static class Ssurgeon.RUNTYPE

protected static class Ssurgeon.SsurgeonArgs

Nested Classes
Modifier and Type	Class and Description
`static class`	`Ssurgeon.ArgsBox`
`static class`	`Ssurgeon.RUNTYPE`
`protected static class`	`Ssurgeon.SsurgeonArgs`

Field Summary

Fields
Modifier and Type	Field and Description
`protected static Ssurgeon.ArgsBox`	`argsBox`
`static java.lang.String`	`DEP_NODENAME_ARG`
`static java.lang.String`	`EDGE_NAME_ARG`
`static java.lang.String`	`GOV_NODENAME_ARG`
`static java.lang.String`	`NAME_ARG`
`static java.lang.String`	`NODE_PROTO_ARG`
`static java.lang.String`	`NODENAME_ARG`
`static java.lang.String`	`POSITION_ARG`
`static java.lang.String`	`RELN_ARG`
`static java.lang.String`	`WEIGHT_ARG`

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`static SsurgPred`	`assemblePredFromXML(org.w3c.dom.Element elt)` Constructs a `SsurgPred` structure from file, given the root element.
`java.util.Collection<SemanticGraph>`	`exhaustFromPatterns(java.util.List<SsurgeonPattern> patternList, SemanticGraph sg)` Similar to the expandFromPatterns, but performs an exhaustive search, performing simplifications on the graphs until exhausted.
`java.util.List<SemanticGraph>`	`expandFromPatterns(java.util.List<SsurgeonPattern> patternList, SemanticGraph sg)` Given a list of SsurgeonPattern edit scripts, and a SemanticGraph to operate over, returns a list of expansions of that graph, with the result of each edit applied against a copy of the graph.
`static java.lang.String`	`getEltText(org.w3c.dom.Element element)` For a given Element, treats the first child as a text element and returns its value.
`static SsurgeonPattern`	`getOperationFromFile(java.lang.String path)` Given a path to a file, converts it into a SsurgeonPattern TODO: finish implementing this stub.
`SsurgeonWordlist`	`getResource(java.lang.String id)` Returns the given resource with the id.
`java.util.Collection<SsurgeonWordlist>`	`getResources()`
`static java.lang.String`	`getTagText(org.w3c.dom.Element element, java.lang.String tag)` For the given element, returns the text for the first child Element with the given tag.
`void`	`initLog(java.io.File logFilePath)`
`static Ssurgeon`	`inst()`
`static void`	`main(java.lang.String[] args)` Performs a simple test and print of a given file.
`static SsurgeonEdit`	`parseEditLine(java.lang.String editLine, java.util.Map<java.lang.String,java.lang.String> attributeArgs, Language language)` Given a string entry, converts it into a SsurgeonEdit object.
`java.util.List<SsurgeonPattern>`	`readFromDirectory(java.io.File dir)` Reads all Ssurgeon patterns from file.
`java.util.List<SsurgeonPattern>`	`readFromDocument(org.w3c.dom.Document doc)`
`java.util.List<SsurgeonPattern>`	`readFromFile(java.io.File file)` Given a path to a file containing a list of SsurgeonPatterns, returns TODO: deal with resources
`java.util.List<SsurgeonPattern>`	`readFromString(java.lang.String text)`
`void`	`setLogPrefix(java.lang.String logPrefix)`
`static SsurgeonPattern`	`ssurgeonPatternFromXML(org.w3c.dom.Element elt)` Given the root Element for a SemgrexPattern (SSURGEON_ELEM_TAG), converts it into its corresponding SemgrexPattern object.
`void`	`testRead(java.io.File tgtDirPath)` Reads in the test file and prints readable to string (for debugging).
`static void`	`writeToFile(java.io.File tgtFile, java.util.List<SsurgeonPattern> patterns)` Given a target filepath and a list of Ssurgeon patterns, writes them out as XML forms.
`static java.lang.String`	`writeToString(SsurgeonPattern pattern)`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

GOV_NODENAME_ARG

public static final java.lang.String GOV_NODENAME_ARG

See Also:: Constant Field Values

DEP_NODENAME_ARG

public static final java.lang.String DEP_NODENAME_ARG

See Also:: Constant Field Values

EDGE_NAME_ARG

public static final java.lang.String EDGE_NAME_ARG

See Also:: Constant Field Values

NODENAME_ARG

public static final java.lang.String NODENAME_ARG

See Also:: Constant Field Values

RELN_ARG

public static final java.lang.String RELN_ARG

See Also:: Constant Field Values

NODE_PROTO_ARG

public static final java.lang.String NODE_PROTO_ARG

See Also:: Constant Field Values

WEIGHT_ARG

public static final java.lang.String WEIGHT_ARG

See Also:: Constant Field Values

NAME_ARG

public static final java.lang.String NAME_ARG

See Also:: Constant Field Values

POSITION_ARG

public static final java.lang.String POSITION_ARG

See Also:: Constant Field Values

argsBox

protected static Ssurgeon.ArgsBox argsBox

Method Detail

inst
```
public static Ssurgeon inst()
```

initLog

public void initLog(java.io.File logFilePath)
             throws java.io.IOException

Throws:: java.io.IOException

setLogPrefix

public void setLogPrefix(java.lang.String logPrefix)

expandFromPatterns

public java.util.List<SemanticGraph> expandFromPatterns(java.util.List<SsurgeonPattern> patternList,
                                                        SemanticGraph sg)
                                                 throws java.lang.Exception

Given a list of SsurgeonPattern edit scripts, and a SemanticGraph to operate over, returns a list of expansions of that graph, with the result of each edit applied against a copy of the graph.

Throws:: java.lang.Exception

exhaustFromPatterns

public java.util.Collection<SemanticGraph> exhaustFromPatterns(java.util.List<SsurgeonPattern> patternList,
                                                               SemanticGraph sg)
                                                        throws java.lang.Exception

Similar to the expandFromPatterns, but performs an exhaustive search, performing simplifications on the graphs until exhausted. TODO: ensure cycles do not occur NOTE: put in an arbitrary depth limit of 3, to prevent churning way too much (heuristic)

Throws:: java.lang.Exception

getOperationFromFile
```
public static SsurgeonPattern getOperationFromFile(java.lang.String path)
```
Given a path to a file, converts it into a SsurgeonPattern TODO: finish implementing this stub.

getResource
```
public SsurgeonWordlist getResource(java.lang.String id)
```
Returns the given resource with the id. If does not exist, will throw exception.

getResources

public java.util.Collection<SsurgeonWordlist> getResources()

parseEditLine

public static SsurgeonEdit parseEditLine(java.lang.String editLine,
                                         java.util.Map<java.lang.String,java.lang.String> attributeArgs,
                                         Language language)

Given a string entry, converts it into a SsurgeonEdit object.

writeToFile

public static void writeToFile(java.io.File tgtFile,
                               java.util.List<SsurgeonPattern> patterns)

Given a target filepath and a list of Ssurgeon patterns, writes them out as XML forms.

writeToString

public static java.lang.String writeToString(SsurgeonPattern pattern)

readFromString

public java.util.List<SsurgeonPattern> readFromString(java.lang.String text)

readFromFile
```
public java.util.List<SsurgeonPattern> readFromFile(java.io.File file)
```
Given a path to a file containing a list of SsurgeonPatterns, returns TODO: deal with resources

readFromDocument

public java.util.List<SsurgeonPattern> readFromDocument(org.w3c.dom.Document doc)

readFromDirectory

public java.util.List<SsurgeonPattern> readFromDirectory(java.io.File dir)
                                                  throws java.lang.Exception

Reads all Ssurgeon patterns from file.

Throws:: java.lang.Exception

ssurgeonPatternFromXML
```
public static SsurgeonPattern ssurgeonPatternFromXML(org.w3c.dom.Element elt)
```
Given the root Element for a SemgrexPattern (SSURGEON_ELEM_TAG), converts it into its corresponding SemgrexPattern object.

assemblePredFromXML
```
public static SsurgPred assemblePredFromXML(org.w3c.dom.Element elt)
```
Constructs a SsurgPred structure from file, given the root element.

testRead
```
public void testRead(java.io.File tgtDirPath)
              throws java.lang.Exception
```
Reads in the test file and prints readable to string (for debugging). Input file consists of semantic graphs, in compact form.

Throws:

java.lang.Exception

getTagText

public static java.lang.String getTagText(org.w3c.dom.Element element,
                                          java.lang.String tag)

For the given element, returns the text for the first child Element with the given tag.

getEltText
```
public static java.lang.String getEltText(org.w3c.dom.Element element)
```
For a given Element, treats the first child as a text element and returns its value.

main
```
public static void main(java.lang.String[] args)
```
Performs a simple test and print of a given file. Usage Ssurgeon [-info infoFile] -patterns patternDir [-type interactive|testinfo]

Class Ssurgeon

Nested Class Summary