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style: comment and formatting changes, and fixes

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* examples/c/lexcalc/parse.y: Fix option handling.
* src/gram.h: Clarify comments.
* src/ielr.c: Fix indentation.
* src/print.c, src/state.h: More comments.
This commit is contained in:
Akim Demaille
2020-10-04 14:28:39 +02:00
parent 0328cbad64
commit 4b0cd01fb7
5 changed files with 20 additions and 15 deletions
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17
src/gram.h
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@@ -24,12 +24,12 @@
/* Representation of the grammar rules:
NTOKENS is the number of tokens, and NNTERMS is the number of
variables (nonterminals). NSYMS is the total number, ntokens +
nnterms.
nonterminals (aka variables). NSYMS is the total number, NTOKENS +
NNTERMS.
Each symbol (either token or variable) receives a symbol number.
Each symbol (either token or nterm) receives a symbol number.
Numbers 0 to NTOKENS - 1 are for tokens, and NTOKENS to NSYMS - 1
are for variables. Symbol number zero is the end-of-input token.
are for nterms. Symbol number zero is the end-of-input token.
This token is counted in ntokens. The true number of token values
assigned is NTOKENS reduced by one for each alias declaration.
@@ -41,7 +41,7 @@
are 0, 1, 2...
Internally, we cannot use the number 0 for a rule because for
instance RITEM stores both symbol (the RHS) and rule numbers: the
instance RITEM stores both symbols (the RHS) and rule numbers: the
symbols are integers >= 0, and rule numbers are stored negative.
Therefore 0 cannot be used, since it would be both the rule number
0, and the token $end.
@@ -77,8 +77,8 @@
RULES[R].useful -- whether the rule is used. False if thrown away
by reduce().
The right hand side is stored as symbol numbers in a portion of
RITEM.
The right hand side of rules is stored as symbol numbers in a
portion of RITEM.
The length of the portion is one greater than the number of symbols
in the rule's right hand side. The last element in the portion
@@ -87,7 +87,8 @@
The portions of RITEM come in order of increasing rule number.
NRITEMS is the total length of RITEM. Each element of RITEM is
called an "item" and its index in RITEM is an item number.
called an "item" of type item_number and its index in RITEM is an
item_index.
Item numbers are used in the finite state machine to represent
places that parsing can get to.