SYNTAX ANALYSIS
ROLE OF THE PARSER
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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leftmost
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rightmost
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either left or right
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none
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Detailed explanation-1: -A top-down parsing technique parses the input by starts constructing a parse tree from the root node moving down to the leaf nodes. A top-down parser uses the leftmost derivation to generate the string.
Detailed explanation-2: -Explanation: Top-down parser generates left most derivation. 8. Identify the most powerful parser? Explanation: Canonical LR is the most powerful parser.
Detailed explanation-3: -In computer science, an LL parser (Left-to-right, leftmost derivation) is a top-down parser for a restricted context-free language. It parses the input from Left to right, performing Leftmost derivation of the sentence. An LL parser is called an LL(k) parser if it uses k tokens of lookahead when parsing a sentence.
Detailed explanation-4: -Top-down parsing can be viewed as an attempt to find left-most derivations of an input-stream by searching for parse-trees using a top-down expansion of the given formal grammar rules. Inclusive choice is used to accommodate ambiguity by expanding all alternative right-hand-sides of grammar rules.