Compiler - LL parser



An LL(k) parser is a type of parser that build the tree in a top-down way.

The inverse approach, the LR approach build the tree from the leaves


  • is a top-down parser
  • that parses from left to right,
  • constructs a leftmost derivation of the input
  • and looks ahead k tokens when selecting between the grammar rule alternatives)

The * means any number of lookahead tokens.

LL parsers can't handle left-recursive rules.

A LL grammar is easier to understand than LR grammars.

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Card Puncher Data Processing
Calcite - Sql Parser

The ''calcite SQL Parser is a LL(k) parser that build a Sql tree (SqlNode) The org/apache/calcite/sql/parser/SqlParserparserConfig parameters control the parse process. For example: identifiers...
Compiler - LR parser

LR is a type of parser that build the tree from the leaves (bottom-up). LL parser LR(k) means:Left to right,Rightmost derivation parser. LR(k), is: a bottom-up parser that parses from left to...
Lexical Analysis - Parser (Syntax analysis|Linter)

A parser create a parse tree data structure from a series of token created by the lexer. The creation of the tree is based on the rules declared in the grammar (which defines the syntactic structure of...

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