HFST: Numbers to English Numerals Script

See HfstNumbersToNumerals for more information.

# From one to nine.
echo "1:one
2:two
3:three
4:four
5:five
6:six
7:seven
8:eight
9:nine" | hfst-strings2fst -j -f $FORMAT > OneToNine.hfst

# Numbers to prefixes that can preceed "-teen" or "-ten".
echo "3:thir
5:fif
6:six
7:seven
8:eigh
9:nine" | hfst-strings2fst -j -f $FORMAT > TeenTen.hfst

# Special numbers.
echo "10:ten
11:eleven
12:twelve
14:fourteen" | hfst-strings2fst -j -f $FORMAT > Special.hfst

# Here we handle ordinary teens and disjunct them with the special numbers.
echo ":teen" | hfst-strings2fst -f $FORMAT > Epsilon2Teen.hfst
echo "1:" | hfst-strings2fst -f $FORMAT > One2Epsilon.hfst
hfst-concatenate One2Epsilon.hfst TeenTen.hfst | hfst-concatenate Epsilon2Teen.hfst > Teens_.hfst
hfst-disjunct Special.hfst Teens_.hfst > Teens.hfst

# Special stems.
echo "2:twen
4:for" | hfst-strings2fst -j -f $FORMAT | hfst-disjunct TeenTen.hfst > TenStem.hfst

# =TenStem= is followed either by "ty" paired with a zero
# or by "ty-" mapped to an epsilon and followed by one
# number.
echo ":ty-" | hfst-strings2fst -f $FORMAT | hfst-concatenate OneToNine.hfst > TMP
echo "0:ty" | hfst-strings2fst -f $FORMAT | hfst-disjunct TMP | hfst-concatenate -1 TenStem.hfst > Tens.hfst

# We finally disjunct all numbers.
hfst-disjunct OneToNine.hfst Teens.hfst | hfst-disjunct Tens.hfst > OneToNinetyNine.hfst

# Let's test the result with random mappings and some test cases.
# TODO...

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-- ErikAxelson - 2011-09-01