parse-tree | 易学教程

HTML Parse tree using Python 2.7

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I was trying to get configure one parse tree for the below HTML table,but couldn't form it.I want to see how the tree structure looks like!can anyone help me here? # <html> # <head> # <title> # The Dormouse's story # </title> # </head> # <body> # # # The Dormouse's story # # # # Once upon a time there were three little sisters; and their names were # <a class="sister" href="http://example.com/elsie" id="link1"> # Elsie # </a> # , # <a class="sister" href="http://example.com/lacie" id="link2"> # Lacie # </a> # and # <a class="sister" href="http:

Getting the parse tree for a predefined function in R

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I feel as if this is a fairly basic question, but I can't figure it out. If I define a function in R, how do I later use the name of the function to get its parse tree. I can't just use substitute as that will just return the parse tree of its argument, in this case just the function name. For example, > f <- function(x){ x^2 } > substitute(f) f How should I access the parse tree of the function using its name? For example, how would I get the value of substitute(function(x){ x^2 }) without explicitly writing out the whole function? I'm not exactly sure which of these meets your desires: eval

What does the dependency-parse output of TurboParser mean?

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I have been trying to use the dependency parse trees generated by CMU's TurboParser . It works flawlessly. The problem, however, is that there is very little documentation. I need to precisely understand the output of their parser. For example, the sentence " I solved the problem with statistics. " generates the following output: 1 I _ PRP PRP _ 2 SUB 2 solved _ VBD VBD _ 0 ROOT 3 the _ DT DT _ 4 NMOD 4 problem _ NN NN _ 2 OBJ 5 with _ IN IN _ 2 VMOD 6 statistics _ NNS NNS _ 5 PMOD 7 . _ . . _ 2 P I haven't found any documentation that can help understand what the various columns stand for,

Does a line profiler for code require a parse tree and is that sufficient?

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问题 I am trying to determine what is necessary to write a line profiler for a language, like those available for Python and Matlab. A naive way to interpret "line profiler" is to assume that one can insert time logging around every line, but the definition of a line is dependent on how a parser handles whitespace, which is only the first problem. It seems that one needs to use the parse tree and insert timings around individual nodes. Is this conclusion correct? Does a line profiler require the

What does the dependency-parse output of TurboParser mean?

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问题 I have been trying to use the dependency parse trees generated by CMU's TurboParser. It works flawlessly. The problem, however, is that there is very little documentation. I need to precisely understand the output of their parser. For example, the sentence " I solved the problem with statistics. " generates the following output: 1 I _ PRP PRP _ 2 SUB 2 solved _ VBD VBD _ 0 ROOT 3 the _ DT DT _ 4 NMOD 4 problem _ NN NN _ 2 OBJ 5 with _ IN IN _ 2 VMOD 6 statistics _ NNS NNS _ 5 PMOD 7 . _ . . _

Generate syntax tree for simple math operations

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I am trying to generate a syntax tree, for a given string with simple math operators (+, -, *, /, and parenthesis). Given the string "1 + 2 * 3": It should return an array like this: ["+", [1, ["*", [2,3] ] ] ] I made a function to transform "1 + 2 * 3" in [1,"+",2,"*",3]. The problem is: I have no idea to give priority to certain operations. My code is: function isNumber(ch){ switch (ch) { case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': case '.': return true; break; default: return false; break; } } function generateSyntaxTree(text){ if

Generate syntax tree for simple math operations

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问题 I am trying to generate a syntax tree, for a given string with simple math operators (+, -, *, /, and parenthesis). Given the string "1 + 2 * 3": It should return an array like this: ["+", [1, ["*", [2,3] ] ] ] I made a function to transform "1 + 2 * 3" in [1,"+",2,"*",3]. The problem is: I have no idea to give priority to certain operations. My code is: function isNumber(ch){ switch (ch) { case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9':

Stanford NLP parse tree format

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This may be a silly question, but how does one iterate through a parse tree as an output of an NLP parser (like Stanford NLP)? It's all nested brackets, which is neither an array nor a dictionary or any other collection type I've used. (ROOT\n (S\n (PP (IN As)\n (NP (DT an) (NN accountant)))\n (NP (PRP I))\n (VP (VBP want)\n (S\n (VP (TO to)\n (VP (VB make)\n (NP (DT a) (NN payment)))))))) This particular output format of the Stanford Parser is call the "bracketed parse (tree)". It is supposed to be read as a graph with words as nodes (e.g. As, an, accountant) phrase/clause as labels (e.g. S,

What's the difference between parse trees and abstract syntax trees?

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I found the two terms in a compiler design book, and I'd like to know what each stands for, and how they are different. I searched on the internet and found that parse trees are also called concrete syntax trees (CSTs). This is based on the Expression Evaluator grammar by Terrence Parr. The grammar for this example: grammar Expr002; options { output=AST; ASTLabelType=CommonTree; // type of $stat.tree ref etc... } prog : ( stat )+ ; stat : expr NEWLINE -> expr | ID '=' expr NEWLINE -> ^('=' ID expr) | NEWLINE -> ; expr : multExpr (( '+'^ | '-'^ ) multExpr)* ; multExpr : atom ('*'^ atom)* ; atom

antlr3 - Generating a Parse Tree

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I'm having trouble figuring out the antlr3 API so I can generate and use a parse tree in some javascript code. When I open the grammar file using antlrWorks (their IDE), the interpreter is able to show me the parse tree, and it's even correct. I'm having a lot of difficulties tracking down resources on how to get this parse tree in my code using the antlr3 runtime. I've been messing around with the various functions in the runtime and Parser files but to no avail: var input = "(PR=5000)", cstream = new org.antlr.runtime.ANTLRStringStream(input), lexer = new TLexer(cstream), tstream = new org