Appendix A. Language Grammar
The grammar is fed from the output of lexical analysis. The tokens returned from lexical analysis are
The following describes the grammar for the OpenGL Shading Language in terms of the preceding tokens:
variable_identifier:
IDENTIFIER
primary_expression:
variable_identifier
INTCONSTANT
UINTCONSTANT
FLOATCONSTANT
BOOLCONSTANT
LEFT_PAREN expression RIGHT_PAREN
postfix_expression:
primary_expression
postfix_expression LEFT_BRACKET integer_expression RIGHT_BRACKET
function_call
postfix_expression DOT FIELD_SELECTION
postfix_expression INC_OP
postfix_expression DEC_OP
integer_expression:
expression
function_call:
function_call_or_method ...
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