Introduction - If you have any usage issues, please Google them yourself
Syntax analysis is the core of the compiler. The role of grammatical analysis is to identify the word given by the lexical analysis of whether a given sequence of symbols of the grammar correct sentences. At present the right syntax analysis method commonly used top-down analysis and bottom-up analysis of two categories.
Determined by top-down approach, starting from the grammar symbols, consider how the current input symbol (word) only determine the choice of productions which replace the corresponding non-terminal symbol derived down. LL (1) grammar is a sure top-down analysis.
LL (1) the meaning is: the first one shows that top-down analysis of L from left to right scanning input string, the second L showed that the analysis process will be the most left-derivation, a show that just the right look can be a symbol deduced that the choice to decide how to produce what type (ie, rules) for derivation.