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skeletons: start some technical documentation

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* data/README: Convert to Markdown.
Start documenting some of the macros used in all our skeletons.
Simplify and fix the documentation of the macros in the skeletons.
This commit is contained in:
Akim Demaille
2018-12-04 06:53:36 +01:00
parent f539a56620
commit 999277ddd8
9 changed files with 125 additions and 106 deletions
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8
data/glr.c
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@@ -114,23 +114,21 @@ m4_define([b4_locuser_args],
# b4_lhs_value(SYMBOL-NUM, [TYPE])
# --------------------------------
# Expansion of $$ or $<TYPE>$, for symbol SYMBOL-NUM.
# See README.
m4_define([b4_lhs_value],
[b4_symbol_value([(*yyvalp)], [$1], [$2])])
# b4_rhs_data(RULE-LENGTH, POS)
# -----------------------------
# Expand to the semantic stack place that contains value and location
# of symbol number POS in a rule of length RULE-LENGTH.
# See README.
m4_define([b4_rhs_data],
[((yyGLRStackItem const *)yyvsp)@{YYFILL (b4_subtract([$2], [$1]))@}.yystate])
# b4_rhs_value(RULE-LENGTH, POS, SYMBOL-NUM, [TYPE])
# --------------------------------------------------
# Expansion of $<TYPE>POS, where the current rule has RULE-LENGTH
# symbols on RHS.
# Expansion of $$ or $<TYPE>$, for symbol SYMBOL-NUM.
m4_define([b4_rhs_value],
[b4_symbol_value([b4_rhs_data([$1], [$2]).yysemantics.yysval], [$3], [$4])])