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SLQ Grammar
The query language used by sq is formally known as SLQ. The
grammar is defined in SLQ.g4, which is an ANTLR4 grammar.
The antlr4 tool generates the parser / lexer files from the grammar.
Being that antlr4 is Java-based, Java must be installed to regenerate
from the grammar. This process is encapsulated in a mage target:
# from SQ_PROJ_ROOT
mage generateparser
The generated .go files ultimately end up in package libsq/slq. Files
in this directory should not be directly edited.
The libsq/ast.Parse function takes a SLQ input string and returns an *ast.AST.
It is the libsq.ExecuteSLQ function that invokes ast.Parse.