| Age | Commit message (Collapse) | Author |
|---|
|
Previously rationals were all parsed as a pair numerator, denominator.
This means 1.02 and 102e-2 were both parsed as 102 # 100 and could not
be tell apart when printing. So the printer had to choose between two
representations : without exponent or without decimal dot. The choice
was made heuristically toward a most compact representation.
Now, decimal dot is still parsed as a power of ten denominator but
exponents are parsed as a product or division by Z.pow_pos. For
instance, 1.02 is parsed as 102 # 100 whereas 102e-2 is parsed as
(102 # 1) / (Z.pow_pos 10 2 # 1).
1.02 and 102e-2 remain equal (proved by reflexivity) but 1.02e1
= (102 # 100) * (10 # 1) = 1020 # 100 and 10.2 = 102 # 10 no longer are.
A nice side effect is that exponents can no longer blow up during
parsing. Previously 1e1_000_000 literally produced a numerator with a
million digits, now it just yields (1 # 1) * (Z.pow_pos 10 1_000_000 # 1).
|
|
We add hexadecimal numerals according to the following regexp
0[xX][0-9a-fA-F][0-9a-fA-F_]*(\.[0-9a-fA-F_]+)?([pP][+-]?[0-9][0-9_]*)?
This is unfortunately a rather large commit. I suggest reading it in
the following order:
* test-suite/output/ZSyntax.{v,out} new test
* test-suite/output/Int63Syntax.{v,out} ''
* test-suite/output/QArithSyntax.{v,out} ''
* test-suite/output/RealSyntax.{v,out} ''
* test-suite/output/FloatSyntax.{v,out} ''
* interp/numTok.ml{i,} extending numeral tokens
* theories/Init/Hexadecimal.v adaptation of Decimal.v
for the new hexadecimal Numeral Notation
* theories/Init/Numeral.v new interface for Numeral Notation (basically,
a numeral is either a decimal or an hexadecimal)
* theories/Init/Nat.v add hexadecimal numeral notation to nat
* theories/PArith/BinPosDef.v '' positive
* theories/ZArith/BinIntDef.v '' Z
* theories/NArith/BinNatDef.v '' N
* theories/QArith/QArith_base.v '' Q
* interp/notation.ml{i,} adapting implementation of numeral notations
* plugins/syntax/numeral.ml ''
* plugins/syntax/r_syntax.ml adapt parser for real numbers
* plugins/syntax/float_syntax.ml adapt parser for primitive floats
* theories/Init/Prelude.v register parser for nat
* adapting the test-suite (test-suite/output/NumeralNotations.{v,out}
and test-suite/output/SearchPattern.out)
* remaining ml files (interp/constrex{tern,pr_ops}.ml where two open
had to be permuted)
|
|
'e' was not displayed when printing decimal notations in R :
Require Import Reals.
Check (1.23e1, 32e+1, 0.1)%R.
was giving
< (123-1%R, 321%R, 1-1%R)
instead of
< (123e-1%R, 32e1%R, 1e-1%R)
This was introduced in #8764 (in Coq 8.10).
|
