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5789f9d91e
Let's use GNU readline and its TAB autocompletion to demonstrate the use of yyexpected_tokens. This shows a number of weaknesses in our current approach: - some macros (yyssp, etc.) from push parsers "leak" in user code, we need to undefine them - the context needed by yyexpected_tokens does not need the token, yypstate actually suffices - yypstate is not properly setup when first allocated, which results in a crash of yyexpected_tokens if fired before a first token was read. We should move initialization from yypush_parse into yypstate_new. * examples/c/bistromathic/parse.y (yylex): Take input as a string, not a file. (EXIT): New token. (input): Adjust to work only on a line. (line): Remove. (symbol_count, process_line, expected_tokens, completion) (init_readline): New. * examples/c/bistromathic/bistromathic.test: Adjust expectations.
82 lines
1.5 KiB
Bash
Executable File
82 lines
1.5 KiB
Bash
Executable File
#! /bin/sh
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# Copyright (C) 2020 Free Software Foundation, Inc.
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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cat >input <<EOF
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1+2*3
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EOF
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run 0 '> 1+2*3
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7
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> '
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cat >input <<EOF
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(1+2) * 3
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EOF
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run 0 '> (1+2) * 3
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9
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> '
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run -noerr 0 '> (1+2) * 3
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9
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> ' -p
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cat >input <<EOF
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a = 256
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sqrt (a)
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EOF
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run 0 '> a = 256
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256
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> sqrt (a)
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16
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> '
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cat >input <<EOF
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a = .16
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b = 10 ^ 2
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sqrt (a * b)
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EOF
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run 0 '> a = .16
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0.16
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> b = 10 ^ 2
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100
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> sqrt (a * b)
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4
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> '
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cat >input <<EOF
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*
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EOF
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run 0 '> *
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> err: 1.1: syntax error: expected end of file or - or ( or exit or double precision number or function or variable before *'
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cat >input <<EOF
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1 + 2 * * 3
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EOF
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run 0 '> 1 + 2 * * 3
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> err: 1.9: syntax error: expected - or ( or double precision number or function or variable before *'
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cat >input <<EOF
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100%
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EOF
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run 0 '> 100%
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100
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> err: 1.4: error: invalid character'
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cat >input <<EOF
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1 / 0
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EOF
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run 0 '> 1 / 0
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> err: 1.1-5: error: division by zero'
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