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authorP. J. McDermott <pj@pehjota.net>2016-02-27 15:40:48 (EST)
committer P. J. McDermott <pj@pehjota.net>2016-02-27 18:29:00 (EST)
commit3fabff2df0215812a042ee70b4708b63be8a4fd0 (patch)
treeb12b1a77504c329ca628a407e64596edd2f0e306 /eshtrans/frontend
parenta7ff3833eb46366370377e93337847c5d3d06af1 (diff)
downloadeggshell-3fabff2df0215812a042ee70b4708b63be8a4fd0.zip
eggshell-3fabff2df0215812a042ee70b4708b63be8a4fd0.tar.gz
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[WIP] eshtrans/frontend: Split input into internal char array
Diffstat (limited to 'eshtrans/frontend')
-rw-r--r--eshtrans/frontend/lexer.esh75
-rw-r--r--eshtrans/frontend/main.esh5
2 files changed, 59 insertions, 21 deletions
diff --git a/eshtrans/frontend/lexer.esh b/eshtrans/frontend/lexer.esh
index a9aaa6d..0b628a6 100644
--- a/eshtrans/frontend/lexer.esh
+++ b/eshtrans/frontend/lexer.esh
@@ -88,8 +88,21 @@ synerr()
lgetc()
{
- c="$(dd bs=1 count=1 2>/dev/null; printf '.')"
- c="${c%.}"
+ if [ ${lbufi} -ge ${lbufc} ]; then
+ c=''
+ else
+ eval "c=\${lbufv_${lbufi}}"
+ lbufi=$((${lbufi} + 1))
+ fi
+}
+
+lsetc()
+{
+ if [ ${lbufi} -ge ${lbufc} ]; then
+ c=''
+ else
+ eval "c=\${lbufv_${lbufi}}"
+ fi
}
#
@@ -272,7 +285,8 @@ next_here()
fi
ln_off=${res%%${RS}*}
res="${res#*${RS}}"
- c="${res%%${RS}*}"
+ lbufi="${res%%${RS}*}"
+ lsetc
res="${res#*${RS}}"
lineno=$((${lineno} + ${ln_off}))
line="${line}${res}"
@@ -362,7 +376,8 @@ next_word()
fi
ln_off=${res%%${RS}*}
res="${res#*${RS}}"
- c="${res%%${RS}*}"
+ lbufi="${res%%${RS}*}"
+ lsetc
res="${res#*${RS}}"
# We must advance lineno because scan_word() was run in a subshell.
@@ -447,12 +462,13 @@ scan_word()
'') lgetc;;
*) c="${tmp_c}"; prev_c='';;
esac
- if ! res=$(scan_wordexp); then
+ if ! res="$(scan_wordexp)"; then
exit 1
fi
ln_off=${res%%${RS}*}
res="${res#*${RS}}"
- c="${res%%${RS}*}"
+ lbufi="${res%%${RS}*}"
+ lsetc
res="${res#*${RS}}"
# We must advance lineno because scan_wordexp()
# was run in a subshell.
@@ -550,7 +566,7 @@ scan_word()
synerr 'Unterminated quoted string'
fi
- printf "%d${RS}%c${RS}%s" ${lines} "${c}" "${word}"
+ printf "%d${RS}%d${RS}%s" ${lines} ${lbufi} "${word}"
}
scan_wordexp()
@@ -579,7 +595,8 @@ scan_wordexp()
"${c}")"; then
exit 1
fi
- c="${res##*${RS}}"
+ lbufi="${res##*${RS}}"
+ lsetc
res="${res%${RS}*}"
ln_off=${res##*${RS}}
res="${res%${RS}*}"
@@ -597,14 +614,15 @@ scan_wordexp()
fi
ln_off=${res%%${RS}*}
res="${res#*${RS}}"
- c="${res%%${RS}*}"
+ lbufi="${res%%${RS}*}"
+ lsetc
res="${res#*${RS}}"
lineno=$((${lineno} + ${ln_off}))
wordexp="\$${res}"
;;
esac
- printf "%d${RS}%c${RS}%s" ${ln_off} "${c}" "${wordexp}"
+ printf "%d${RS}%d${RS}%s" ${ln_off} ${lbufi} "${wordexp}"
return 0
}
@@ -628,7 +646,8 @@ scan_wordexp_param_brace()
fi
ln_off=${res%%${RS}*}
res="${res#*${RS}}"
- c="${res%%${RS}*}"
+ lbufi="${res%%${RS}*}"
+ lsetc
res="${res#*${RS}}"
param="#${res}"
lineno=$((${lineno} + ${ln_off}))
@@ -647,7 +666,8 @@ scan_wordexp_param_brace()
fi
ln_off=${res%%${RS}*}
res="${res#*${RS}}"
- c="${res%%${RS}*}"
+ lbufi="${res%%${RS}*}"
+ lsetc
res="${res#*${RS}}"
param="${res}"
lineno=$((${lineno} + ${ln_off}))
@@ -706,7 +726,8 @@ scan_wordexp_param_brace()
fi
ln_off=${res%%${RS}*}
res="${res#*${RS}}"
- c="${res%%${RS}*}"
+ lbufi="${res%%${RS}*}"
+ lsetc
res="${res#*${RS}}"
# We must advance lineno because scan_word() was run in a
# subshell.
@@ -771,7 +792,7 @@ scan_param()
;;
esac
- printf "%d${RS}%c${RS}%s" 0 "${c}" "${param}"
+ printf "%d${RS}%d${RS}%s" 0 ${lbufi} "${param}"
return 0
}
@@ -811,12 +832,13 @@ scan_wordexp_arith()
;;
'$')
lgetc
- if ! res=$(scan_wordexp); then
+ if ! res="$(scan_wordexp)"; then
exit 1
fi
ln_off=${res%%${RS}*}
res="${res#*${RS}}"
- c="${res%%${RS}*}"
+ lbufi="${res%%${RS}*}"
+ lsetc
res="${res#*${RS}}"
# We must advance lineno because scan_wordexp()
# was run in a subshell.
@@ -862,7 +884,7 @@ run_sublexer()
;;
esac
- printf "${RS}%d${RS}%c" ${lineno} "${c}"
+ printf "${RS}%d${RS}%d" ${lineno} ${lbufi}
return 0
}
@@ -873,8 +895,9 @@ run_sublexer()
run_lexer()
{
local fn="${1}"
- local st="${2}"
- shift 2
+ local buf="${2}"
+ local st="${3}"
+ shift 3
# Initialize global variables.
fname="${fn}"
@@ -884,6 +907,20 @@ run_lexer()
here_awaiting_end=false
here_awaiting_word=false
+ # Read file into array
+ eval "$(printf '%s' "${buf}" | awk -v FS='' -v j=0 \
+ -v squote="'" -v esc_squote="'\\\\''" '
+ {
+ for (i = 1; i <= NF; ++i) {
+ sub(squote, esc_squote, $i);
+ printf("lbufv_%d='\''%s'\''\n", j++, $i);
+ };
+ printf("lbufv_%d='\''\n'\''\n", j++);
+ }
+ ')"
+ lbufi=0
+ lbufc=${#buf}
+
# Read the first character and recognize the first token.
lgetc
next
diff --git a/eshtrans/frontend/main.esh b/eshtrans/frontend/main.esh
index b9f93a6..fc25b5f 100644
--- a/eshtrans/frontend/main.esh
+++ b/eshtrans/frontend/main.esh
@@ -21,9 +21,10 @@
esh_parse()
{
local fn="${1}"
- shift 1
+ local buf="${2}"
+ shift 2
- if run_lexer "${fn}" complete_command; then
+ if run_lexer "${fn}" "${buf}" complete_command; then
return 0
fi
return 1