|
| |
| | Abstract syntax tree - Wikipedia, the free encyclopedia |
 | | In computing, it is used in a parser as an intermediate between a parse tree and a data structure, the latter which is often used as a compiler or interpreter's internal representation of a computer program while it is being optimized and from which code generation is performed. | | | In computer science, an abstract syntax tree (AST) is a finite, labeled, directed tree, where the nodes are labeled by operators, and the edges represent the operands of the node operators. | | | Creating an AST in a parser for a language described by a context free grammar, as nearly all programming languages are, is straightforward. |
|
http://en.wikipedia.org/wiki/Abstract_syntax_tree
(302 words)
|
|
| |
| | XML for Java: Programming Guide |
| | InputStream is = new FileInputStream(filename); Parser parse = new Parser(filename, ee = new ErrorEater(filename), null); TXDocument doc = parse.readStream(is); | | | InputStream is = new FileInputStream(filename); Parser parse = new Parser(filename, new ErrorIgnorer(), null); TXDocument doc = parse.readStream(is); | | | In this way, the parser prints parse errors to the standard error stream. |
|
http://sunsite.berkeley.edu/~jmcdonou/xml4j/guide.html
(1042 words)
|
|
| |
| | Trees |
| | Parse trees are an in-memory representation of the input with a structure that conforms to the grammar. | | | The data member trees of tree_parse_info is a std::vector. | | | Once you have created a tree by calling pt_parse or ast_parse, you have a tree_parse_info which contains the root node of the tree, and now you need to do something with the tree. |
|
http://www.boost.org/libs/spirit/doc/trees.html
(2305 words)
|
|
| |
| | Natural Language Processing Course -- Class 17 |
| | Parse tree is defined as as tree and remainder of sentence to be parsed: | | | The semantics of a tree is computed from the semantics of its elements. | | | The important concept is to use compositional semantic analysis: the semantic interpretation of a node in the parse tree is obtained as a function of the semantic interpretation of its daughter constituents. |
|
http://www.cs.bgu.ac.il/~yaeln/nlp02/class17.html
(1048 words)
|
|
| |
| | Parse tree - definition of Parse tree in Encyclopedia |
| | A parse tree is a grammatical structure represented as a tree data structure. | | | A sentence structure represented as a parse tree. | | | Parse tree - definition of Parse tree in Encyclopedia |
|
http://encyclopedia.laborlawtalk.com/Parse_tree
(66 words)
|
|
| |
| | Binary Trees |
| | Parsing an input language according to a grammar is frequently necessary in computing. | | | The [Suffix Tree] is a data-structure for solving the string searching problem. | | | The tree operations described so far have no side-effects except for input, output and manipulation of dynamic storage; they are pure tree operations. |
|
http://www.csse.monash.edu.au/~lloyd/tildeAlgDS/Tree
(2830 words)
|
|
| |
| | [No title] |
| | The evaluator takes an abstract syntax tree (or parse tree) and an environment, and executes the parse tree in the environment. | | | The representation is in the form a tree, referred to as a parse tree or abstract syntax tree, and provides easy access to subcomponents of the expression. | | | Parse tree for the expression Example: * 5 + - * 6 7 5 + 8 9 Note that the parse tree immediately provides a guideline for evaluating the expression. |
|
http://www.ccs.neu.edu/home/rraj/Courses/172x/F02/Lectures/notes9.txt
(624 words)
|
|
| |
| | About Parse Trees |
| | VisualText analyzers build and use a single parse tree (or tree, for short) which is a data structure that tracks the patterns that have matched within the input text. | | | The final parse tree is the tree produced by fully analyzing a text with a text analyzer. | | | Generations, or levels, of nodes in the parse tree are indicated by indentation. |
|
http://www.textanalysis.com/help/visualtext_basics/about_parse_trees.htm
(593 words)
|
|
| |
| | Parse Trees |
| | A parse tree is supposed to display the structure used by a grammar to generate an input string. | | | While in general it may be difficult to prove a grammar is ambiguous, the demonstration of two distinct parse trees for the same terminal string is sufficient proof that a grammar is ambiguous. | | | A parse tree for a grammar G is a tree where |
|
http://www.cs.rochester.edu/users/faculty/nelson/courses/csc_173/grammars/parsetrees.html
(692 words)
|
|
| |
| | Project3 Parse Tree Output |
| | The tree output format for the remaining should be fairly obvious from the given examples. | | | This is an explanation of the format of the sample parse trees given along with the assignment. | | | In theory, the leaf nodes of a parse tree include every input token. |
|
http://www.cs.cmu.edu/~thkang/212-a/project/ParseTreeFormat.html
(573 words)
|
|
| |
| | Compact Representation of Parse Trees |
| | Thus the parse tree of a sentence may be constructed as a side-effect of the recognition phase. | | | The set of derived trees for this tree substitution grammar equals the set of derivation trees of the parse (ignoring the non-terminal symbols of the tree substution grammar). | | | Because we use chunks of parse trees less packing is possible than in their approach. |
|
http://odur.let.rug.nl/~vannoord/papers/cl97/node4.html
(1269 words)
|
|
| |
| | Parse tree - Wikipedia, the free encyclopedia |
| | Parse trees may be generated for sentences in natural languages (see natural language processing), as well as during processing of computer languages, such as programming languages. | | | A parse tree is a tree that represents the syntactic structure of a string according to some formal grammar. | | | A program that produces such trees is called a parser. |
|
http://en.wikipedia.org/wiki/Parse_tree
(81 words)
|
|
| |
| | Efficiently Building a Parse Tree From a Regular Expression (ResearchIndex) |
| | 0.3: On the Myhill-Nerode Theorem for Trees - Kozen (1992) | | | Each of our algorithms to produce a parse tree from an input string has an optimal time complexity, linear with the length of the string. | | | We present efficient algorithms for performing different tasks that concern parsing: producing the external representation and the internal representation of parse trees; producing all possible parse trees or a single one. |
|
http://citeseer.ist.psu.edu/340667.html
(359 words)
|
|
| |
| | untitled |
| | The methods of parse tree classes are designed to implement the compiler components that use a parse tree as input. | | | Compiler modules that use parse trees as input (semantic analyzer, Intermediate Language (IL) code generator) are easier to write when a well design APT is used. | | | The design of the parse tree requires the definition of C++ classes used to represent the nodes of the parse tree. |
|
http://www.csc.calpoly.edu/~lchirica/450/P3/Project3.htm
(3466 words)
|
|
| |
| | DifGP Docs |
| | This routine returns a pointer to the root node of a parse tree holding the the partial differential with respect to the qth variable of the parse tree pointer to be t. | | | The leaves of a parse tree are either variables or ephemeral constants. | | | The intervention to remove the opcode happens only when parse trees are generated, this does not remove the operation from existing parse trees. |
|
http://orion.math.iastate.edu/danwell/Alli/DifDoc.html
(821 words)
|
|
| |
| | Parse Trees |
| | These simplified trees are known as abstract parse trees, and their structure is described by an abstract grammar. | | | If we created parse trees that contained all the text, they would be concrete parse trees. | | | You can now begin to see that this is only part of the story, as the parse trees for expressions are really just subtrees in bigger trees representing individual functions, which are themselves parts of a single tree representing the whole program. |
|
http://www.cs.man.ac.uk/~pjj/cs2121/ho/node8.html
(1204 words)
|
|
| |
| | Building Parse Trees |
| | We've added a second argument and in it constructed the parse tree for the entire expression phrase given the parse trees for the component expression and term phrases. | | | Then we'd first recognize and if there were no parses, we'd simply report failure, and if there were parses, we'd reprocess the input string, this time using the parsing version of the grammar. | | | But often it is the case that one wants, given a string to construct the parse tree(s) for it. |
|
http://www.cs.sunysb.edu/~warren/xsbbook/node28.html
(626 words)
|
|
| |
| | JavaCC, parse trees, and the XQuery grammar, Part 2 |
| | nodes to the parse tree and not subclasses thereof. | | | Figure 3 shows the parse tree generated by this grammar that correctly enables you to evaluate "1 + 2 * 3" as "1 + (2 * 3)". | | | Walking through the parse tree at runtime with a good debugger is another invaluable adjunct to understanding how tree building works in JJTree. |
|
http://www-128.ibm.com/developerworks/xml/library/x-javacc2
(2435 words)
|
|
| |
| | PCLParseTreeNode -- Object Serialization Parse Tree |
| | The PCL parse tree classes include methods for conveniently reading parse tree's from a text file, and writing them to a parse tree. | | | Such parse trees are typically used to hold an inmemory format of objects being serialized, or de-serialized. | | | The PTNSubTree class also has a number of helper methods related to reading a parse tree from a file, or writing one to a file. |
|
http://www.pcigeomatics.com/cgi-bin/pcihlp/PCLParseTreeNode
(1144 words)
|
|
| |
| | [No title] |
| | This tree is returned to the parser for incorporation in the parse tree, with the parser itself needing to take no special action to handle these cases. | | | The first is TREE, which determines whether the parse tree is printed after the parse completes. | | | .uh "Printing of the Parse Tree".pp For simplicity the parse tree is printed from left to right with one space for each level of the tree which has been traversed. |
|
http://www.cs.rpi.edu/~moorthy/Courses/compiler/doscher/tree.doc
(320 words)
|
|
| |
| | Notes from the Dawn of Time |
| | A parse tree is a data structure that represents not only what the tokens in an input line mean, but how they were generated. | | | So what you need to produce from your parse tree is a data structure of atoms that reflect this information, and which is implemented in a form directly acceptable by your game engine. | | | The parse tree lets us see how the input line was split into sentences, and how sentences were split into commands, so we know what each individual command consists of in terms of tokens (and therefore atoms). |
|
http://www.skotos.net/articles/dawnof18.shtml
(968 words)
|
|
| |
| | Display a parse tree with minimum parentheses? |
| | The parse tree reflects the appropriate precedence for the source language, and as you do the tree walk, you can check to see if the precedence of the current operator is less than (rather than less than or equal to) the parent operator. | | | Given a parse tree representing a typical boolean expression, where the grouping is implicit in the tree structure, is there an algorithm to print the equivalent unambiguous infix expression with the minimum parentheses (preserving left-to-right order)? | | | The reason this works is roughly this: Precedence conditions disambiguates a grammar by prohibiting certain expansion in the derivation of the parse tree. |
|
http://www.codecomments.com/message173489.html
(761 words)
|
|
| |
| | The Parse Tree |
| | ult in different parse trees.nces are ambiguous --- i.e. | | | pt]n ate the cake103.html#parsetree">8.1 shows the parse tree for the sentence:xt_motif.gif"> | | | the cake103.html#parsetree">8.1 shows the parse tree for the sentence:xt_motif.gif"> |
|
http://www.oopweb.com/Prolog/Documents/prologbook/Volume/node103.html
(61 words)
|
|
| |
| | HTML::TreeBuilder - phpMan |
| | If it is false you get a parse tree that just reflects the text as it stands, which is unlikely to be useful for anything but quick and dirty parsing. | | | Include a note as to how it parses (presumably including its $tree->dump output), and then a careful and clear explanation of where you think the parser is going astray, and how you would prefer that it work instead. | | | However, consider if you were parsing this:
Hooboy!
In that case, "$root->guts()" would return three items: an element object for the first "hr", a text string "Hooboy!", and another "hr" element object. |
|
http://www.chedong.com/phpMan.php/man/HTML::TreeBuilder
(2393 words)
|
|
| |
| | Parse Tree for a Compiler? - GameDev.Net Discussion Forums |
| | The parse tree is implicitly created by the call stack in that case. | | | Tree structures always require additional pointers and some fairly complex data structures, however as a way to avoid the additional overhead, you can replace trees with stacks and a more linear data structure. | | | I have read that it is helpful to imagine, that while the process of parsing, a parse tree is created. |
|
http://www.gamedev.net/community/forums/viewreply.asp?ID=776653
(439 words)
|
|
| |
| | Parse Tree |
| | I will demonstrate the use of polymorphism in an example of a data structure—the arithmetic tree. | | | Notice that the tree representation doesn’t require any parentheses or the knowledge of operator precedence. | | | A rule of thumb is that, if a class has a virtual function, it probably needs a virtual destructor as well--and once we decide to pay the overhead of a vtable pointer, all subsequent virtual functions don’t increase the size of the object. |
|
http://www.relisoft.com/book/lang/poly/3tree.html
(938 words)
|
|
| |
| | Parse tree transformation to functional description |
| | The conversion process is not trivial, as parse trees lack much of the semantic information needed for generation; this is further complicated by the fact that parse trees often correspond to more than one semantic representation. | | | An appropriate FD is an FD that generates the closest lexicalized string (with respect to a tree edit distance function) to the parse tree equivalent. | | | The analysis modules of SIGNAL identify these in parse tree form, but they need to be converted to to a functional description form for input to generation. |
|
http://www.cs.columbia.edu/~min/papers/thesis/node117.html
(646 words)
|
|
| |
| | [No title] |
| | So we produce a list of parse trees ;; which are then turned into a parse tree after the compositionis complete.) ;; When functions have been created for each rule, functions corresponding to each ;; non-terminal are created by composing the functions for each rule for that ;; non-terminal. | | | E.g., the function corresponding to the rule ;; (S -> (NP VP)), when applied to a parse tree, returns the list of positions after ;; the end of the tree that are S's, according to this rule (and the rest of the ;; grammar). | | | ;; ;; ;; This parser creates a function for each non-terminal which, given a parse tree ;; for a portion of a phrase, returns a list of parse trees detailing where, according ;; to the grammar, the non-terminal occurs following the input parse tree. |
|
http://www.cs.berkeley.edu/~wilensky/lispcraft/sources/td-parser.lisp
(320 words)
|
|
| |
| | Comp.compilers: Re: yacc parse tree |
| | Re: yacc parse tree simon.cozens@pembroke.oxford.ac.uk (Simon Cozens) (1998-12-13) | | | Re: yacc parse tree AMartin@ma.ultranet.com (Alan H. Martin) (1999-01-02) | | | Re: yacc parse tree josh_adams@bmc.com (Josh Adams) (1998-12-19) |
|
http://compilers.iecc.com/comparch/article/98-12-035
(216 words)
|
|
| |
| | Grammatica 1.4 Documentation: Analyzer |
| | This class provides callback methods that may be used either during parsing, or for a parse tree traversal. | | | If no parse tree should be created, this method should return null. | | | This method is used to process a parse tree after creation. |
|
http://www.nongnu.org/grammatica/doc/api/csharp/PerCederberg.Grammatica.Parser/Analyzer.html
(587 words)
|
|
| |
| | Problem H: Tree Reconstruction |
| | The nodes in the tree are numbered 1, 2,..., n. | | | The first line of a input is the number n (1 <= n <= 1000) of nodes in the tree. | | | Instead of e-mailing you the parse tree so that you can rewrite the solution, your friend decides to play a practical joke and sends you just the DFS and BFS trace. |
|
http://acm.uva.es/p/v104/10410.html
(227 words)
|
|
| |
| | An Introduction to Parsers - Building a Parser with ProGrammar |
| | After each successful parse, the parse engine generates a parse tree, which is a data structure that maps grammar symbols to elements in the input stream. | | | The API provides methods to load grammars, parse data, process errors, and retrieve data elements from the parse tree. | | | A binary grammar file is generated by the IDE whenever a project is built. |
|
http://www.programmar.com/buildparser.htm
(306 words)
|
|
| |
| | Parse Tree |
| | You can safely assume that a single parse tree won’t need more than 200 lines to be drawn and no line will need more than 200 characters. | | | There will be no invalid and ambiguous input, i.e., there will always be a unique parse-tree for the input. | | | For each test case, print the parse- tree. |
|
http://acm.uva.es/p/v104/10467.html
(278 words)
|
|
| |
| | [No title] |
| | ;;;; Remember to use a grammar, as in (use *grammar4*) (in-package "USER") (defvar *grammar* nil "The grammar used by GENERATE.") (defstruct (rule (:type list)) lhs -> rhs) (defstruct (parse) "A parse tree and a remainder." tree rem) ;; Trees are of the form: (lhs. |
|
http://www.cs.bgu.ac.il/~yaeln/nlp2000/code/syntax1.lisp
(102 words)
|
|
| |
| | Rules on INSERT, UPDATE and DELETE |
| | The parser created the parse tree (this time the parts of the original parse tree are highlighted because the base of operations is the rule action for update rules). | | | The parse trees generated from rule actions are thrown into the rewrite system again and maybe more rules get applied resulting in more or less parse trees. | | | A more sophisticated way to use the rule system is to create rules that rewrite the parse tree into one that does the right operation on the real tables. |
|
http://www.ica.org.ve/guidox/bd/postgres/rules-insert.html
(2639 words)
|
|
| |
| | Main Parse Tree Menu |
| | Displays the full parse tree, starting at the root, assuming that the current selection in the Text Tab has been analyzed. | | | If the analyzer has been run with Generate Logs on, the parse tree for the currently selected pass in the Ana Tab is displayed. | | | Highlights the text in the input file corresponding to the selected node in the tree display. |
|
http://textanalysis.com/help/visualtext_interface/main_parse_tree_menu.htm
(293 words)
|
|
| |
| | Parse Tree Probability in Data Oriented Parsing (ResearchIndex) |
| | An important component of such systems is the way in which the substitution probability of a parse tree fragment is estimated from its occurrences in the treebank. | | | Abstract: Data oriented parsing systems employ redundant stochastic tree substitution grammars (STSGs) to analyse natural language utterances on the basis of an annotated corpus (a treebank). | | | Parse Tree Probability in Data Oriented Parsing (ResearchIndex) |
|
http://citeseer.ist.psu.edu/489157.html
(187 words)
|
|
| |
| | Re: pod2xml/xml2pod (Pod::PXML) |
| | See the section "TREE-BASED PARSING" in the Pod::Parser PODs where it describes this and gives some code snippets for a few different high-level examples of how to do this. | | | The TREE-BASED PARSING section in the PODs gives a few simple examples for how to do this: package MyPodParserTree; @ISA = qw(Pod::Parser); my %ptopts = (... | | | On Tue, Apr 17, 2001 at 09:38:46PM +0100, Matt Sergeant wrote: > There's a few things that I really hate about POD::Parser, the most > significant thing is that it's impossible (or at least very difficult) > to output the results to anything other than a file. |
|
http://www.mail-archive.com/pod-people@perl.org/msg00240.html
(384 words)
|
|
| |
| | [No title] |
| | The idea is that the given template just computes some value or values in the control pass, and no actual C code, and returns these values to the caller. | | | Note that an input value corresponds to a non-var template parameter, the output value will be unchanged. | | | Unfortunately, this uses a horrible algorithm that walks to the end of the linked list to find the last node, and adds it afterwards. |
|
http://www.cs.cmu.edu/afs/cs.cmu.edu/project/cmcl/link.fx/ccom/parse.c
(847 words)
|
|
| |
| | Parse tree -- Facts, Info, and Encyclopedia article |
| | Parse trees may be generated for (A string of words satisfying the grammatical rules of a language) sentences in (A human written or spoken language used by a community; opposed to e.g. | | | A program that produces such trees is called a (A computer program that divides code up into functional components) parser. | | | (Click link for more info and facts about Parsing) Parsing |
|
http://www.absoluteastronomy.com/encyclopedia/p/pa/parse_tree.htm
(152 words)
|
|
| |
| | Precedence Evaluation Parse Tree |
| | Using the precedence expression grammar, we show a derivation of the string as a parse tree: | | | For example, it is wrong to insert parentheses to derive a parse tree for | | | N.B.: The leaves of the parse tree when read back from left to right must exactly match the string being derived. |
|
http://www.cs.wm.edu/~noonan/cs442/syllabus/grammars/precparse.html
(60 words)
|
|
| |
| | Real Parse Tree, Code Page |
| | Currently the package supplies calls for a lone tree, one or two unary ADFS, one or two binary ADFs, a unary and a binary ADF, or two each unary and binary ADFs. | | | The mutateST(t) operation takes a tree (pointer to struct node), selects a node in the tree at random, and replaces the sub tree rooted there with a new sub tree the same size. | | | The mutateND(t) operation takes a tree (pointer to struct node), selects a node in the tree at random, and replaces its operation with another selected at random from those available with the sam arity. |
|
http://orion.math.iastate.edu/danwell/rgp/gpdoc.html
(940 words)
|
|
| |
| | Returning the Parse Tree |
| | For a parse to be useful we often want to return the parse tree, once we've parsed the sentence. | | | This may then be used by a semantic component, to help determine the meaning of the sentence. | | | Anyway, in Prolog we return the parse tree by adding extra arguments to our grammar rules, like the following: |
|
http://www.macs.hw.ac.uk/~alison/ai3notes/subsection2_7_3_4.html
(85 words)
|
|
| |
| | Struct template string_parse_tree |
| | It also features a match function which can can handle nasty input interators by caching values as it recurses the tree so that it can backtrack as needed. | | | This class provides a quick lookup by building what amounts to a tree data structure. | | | boost::date_time::string_parse_tree — Recursive data structure to allow efficient parsing of various strings. |
|
http://www.boost.org/regression-logs/cs-win32_metacomm/doc/html/string_parse_tree.html
(239 words)
|
|
| |
| | Comp.compilers: Re: OOP Parse tree generation? |
| | I have a working example of using algebraic types to represent parse | | | The number of resulting classes in tree generation methods comparable | | | > artifacts of a parse into an object oriented mass is that of class |
|
http://compilers.iecc.com/comparch/article/00-03-122
(232 words)
|
|
| |
| | RubyForge: ParseTree - ruby parse tree tools: Project Info |
| | ParseTree is a C extension (using RubyInline) that extracts the parse tree for an entire class or a specific method and returns it as a s-expression (aka sexp) using ruby's arrays, strings, symbols, and integers. | | | RubyForge: ParseTree - ruby parse tree tools: Project Info |
|
http://rubyforge.org/projects/parsetree
(44 words)
|
|
| |
| | HTML::TreeBuilder (Perl & LWP) |
| | the tree to free the memory it used. | | | There are two ways of parsing HTML: from a file or from strings. | | | Enable this option to create parse trees without the text from the document. |
|
http://wziemer.cnsm.csulb.edu/perlCD/lwp/ch09_02.htm
(782 words)
|
|
| |
| | ParseView |
| | While the parse is running, the status line under the scan tree will display the current line number in the source file. | | | The main part of the display is the Parse and Scan tree area. | | | Status of parse (what was matched when parser paused, line numbers while parse is running) |
|
http://www.javadude.com/tools/parseview
(1288 words)
|
|
|
