Rewrite REPL test parser
- Use a recursive descent parser so that it's easy to extend.
- Add `@args` to enable customizing command-line arguments
- Add `@should-start` to enable `nix repl` tests that error before
entering the REPL
- Make sure to read all stdout output before comparing. This catches
some extra output we were tossing out before!
Change-Id: I5522555df4c313024ab15cd10f9f04e7293bda3a
This commit is contained in:
parent
f3f7d81988
commit
83729b2075
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@ -1,17 +1,28 @@
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Commentary "meow meow meow"
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Command "command"
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Output "output output one"
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Output ""
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Output ""
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Output "output output two"
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Commentary "meow meow"
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Command "command two"
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Output "output output output"
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Commentary "commentary"
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Output "output output output"
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Output ""
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Commentary "the blank below should be chomped"
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Command "command three"
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Commentary ""
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Output "meow output"
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Output ""
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Commentary: "meow meow meow"
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Indent: " "
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Prompt: "nix-repl> "
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Command: "command"
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Indent: " "
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Output: "output output one"
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Output: ""
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Commentary: ""
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Indent: " "
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Output: "output output two"
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Commentary: "meow meow"
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Indent: " "
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Prompt: "nix-repl> "
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Command: "command two"
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Indent: " "
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Output: "output output output"
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Commentary: "commentary"
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Indent: " "
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Output: "output output output"
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Output: ""
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Commentary: "the blank below should be chomped"
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Indent: " "
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Prompt: "nix-repl> "
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Command: "command three"
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Commentary: ""
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Indent: " "
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Output: "meow output"
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Output: ""
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@ -1,10 +1,9 @@
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Command "command"
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Output "output output one"
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Output ""
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Output ""
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Output "output output two"
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Command "command two"
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Output "output output output"
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Output "output output output"
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Command "command three"
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Output "meow output"
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Command: "command"
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Output: "output output one"
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Output: ""
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Output: "output output two"
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Command: "command two"
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Output: "output output output"
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Output: "output output output"
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Command: "command three"
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Output: "meow output"
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@ -0,0 +1,11 @@
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command
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output output one
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output output two
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command two
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output output output
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output output output
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command three
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meow output
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@ -1,6 +1,7 @@
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https://github.com/NixOS/nix/pull/9917 (Enter debugger more reliably in let expressions and function calls)
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This test ensures that continues don't skip opportunities to enter the debugger.
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@args --debugger
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trace: before outer break
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info: breakpoint reached
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@ -13,7 +14,7 @@ This test ensures that continues don't skip opportunities to enter the debugger.
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0: error: breakpoint reached
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«none»:0
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1: while calling a function
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TEST_DATA/regression_9917.nix:3:5
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$TEST_DATA/regression_9917.nix:3:5
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2| a = builtins.trace "before inner break" (
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3| builtins.break { msg = "hello"; }
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@ -21,7 +22,7 @@ This test ensures that continues don't skip opportunities to enter the debugger.
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4| );
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2: while calling a function
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TEST_DATA/regression_9917.nix:2:7
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$TEST_DATA/regression_9917.nix:2:7
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1| let
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2| a = builtins.trace "before inner break" (
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@ -1,3 +1,4 @@
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@args --debugger
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error:
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… while evaluating the error message passed to builtin.throw
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@ -14,3 +15,18 @@ We expect to be able to see locals like r in the debugger:
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Env level 1
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abort baseNameOf break builtins derivation derivationStrict dirOf false fetchGit fetchMercurial fetchTarball fetchTree fromTOML import isNull map null placeholder removeAttrs scopedImport throw toString true
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nix-repl> :quit
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error:
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… while evaluating the file '$TEST_DATA/regression_9918.nix':
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… while calling the 'throw' builtin
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at $TEST_DATA/regression_9918.nix:3:7:
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2| r = [];
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3| x = builtins.throw r;
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| ^
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4| in
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… while evaluating the error message passed to builtin.throw
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error: cannot coerce a list to a string: [ ]
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@ -1,5 +1,5 @@
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with { inherit ({}) invalid; };
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let
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x = builtins.break 1;
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puppy = "doggy";
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in
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x
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builtins.break { }
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@ -1,3 +1,4 @@
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@args --debugger
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info: breakpoint reached
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debugger should not crash now, but also not show any with variables
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@ -5,10 +6,21 @@ debugger should not crash now, but also not show any with variables
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0: error: breakpoint reached
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«none»:0
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Env level 0
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static: x
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static: puppy
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Env level 1
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static:
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Env level 2
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abort baseNameOf break builtins derivation derivationStrict dirOf false fetchGit fetchMercurial fetchTarball fetchTree fromTOML import isNull map null placeholder removeAttrs scopedImport throw toString true
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error:
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… while evaluating the file '$TEST_DATA/regression_l145.nix':
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… while calling the 'break' builtin
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at $TEST_DATA/regression_l145.nix:5:3:
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4| in
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5| builtins.break { }
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| ^
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6|
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error: breakpoint reached\n
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@ -1,3 +1,4 @@
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@args --debugger
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trace: before outer break
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info: breakpoint reached
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@ -24,7 +25,7 @@ If we :st past the frame in the backtrace with the meow in it, the meow should n
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nix-repl> :st 3
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3: while calling a function
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TEST_DATA/stack_vars.nix:5:7
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$TEST_DATA/stack_vars.nix:5:7
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4| );
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5| b = builtins.trace "before outer break" (
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@ -58,9 +59,8 @@ If we :st past the frame in the backtrace with the meow in it, the meow should n
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3
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nix-repl> :st 3
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3: while calling a function
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TEST_DATA/stack_vars.nix:2:7
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$TEST_DATA/stack_vars.nix:2:7
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1| let
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2| a = builtins.trace "before inner break" (
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@ -72,3 +72,21 @@ If we :st past the frame in the backtrace with the meow in it, the meow should n
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Env level 1
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abort baseNameOf break builtins derivation derivationStrict dirOf false fetchGit fetchMercurial fetchTarball fetchTree fromTOML import isNull map null placeholder removeAttrs scopedImport throw toString true
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nix-repl> :quit
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error:
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… while calling the 'trace' builtin
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at $TEST_DATA/stack_vars.nix:2:7:
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1| let
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2| a = builtins.trace "before inner break" (
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| ^
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3| let meow' = 3; in builtins.break { msg = "hello"; }
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… while calling the 'break' builtin
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at $TEST_DATA/stack_vars.nix:3:23:
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2| a = builtins.trace "before inner break" (
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3| let meow' = 3; in builtins.break { msg = "hello"; }
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| ^
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4| );
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error: breakpoint reached
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@ -1,16 +1,17 @@
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#include <gtest/gtest.h>
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#include <boost/algorithm/string/replace.hpp>
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#include <optional>
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#include <string>
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#include <string_view>
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#include <optional>
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#include <unistd.h>
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#include <boost/algorithm/string/replace.hpp>
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#include "escape-string.hh"
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#include "test-session.hh"
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#include "util.hh"
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#include "tests/characterization.hh"
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#include "tests/cli-literate-parser.hh"
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#include "tests/terminal-code-eater.hh"
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#include "util.hh"
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using namespace std::string_literals;
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@ -40,91 +41,147 @@ public:
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return unitTestData + "/" + testStem;
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}
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void runReplTest(std::string_view const & content, std::vector<std::string> extraArgs = {}) const
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void runReplTest(const std::string content, std::vector<std::string> extraArgs = {}) const
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{
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auto syntax = CLILiterateParser::parse(std::string(REPL_PROMPT), content);
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auto parsed = cli_literate_parser::parse(
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content, cli_literate_parser::Config{.prompt = std::string(REPL_PROMPT), .indent = 2}
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);
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parsed.interpolatePwd(unitTestData);
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// FIXME: why does this need two --quiets
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// show-trace is on by default due to test configuration, but is not a standard
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Strings args{"--quiet", "repl", "--quiet", "--option", "show-trace", "false", "--offline", "--extra-experimental-features", "repl-automation"};
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// show-trace is on by default due to test configuration, but is not a
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// standard
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Strings args{
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"--quiet",
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"repl",
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"--quiet",
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"--option",
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"show-trace",
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"false",
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"--offline",
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"--extra-experimental-features",
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"repl-automation",
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};
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args.insert(args.end(), extraArgs.begin(), extraArgs.end());
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args.insert(args.end(), parsed.args.begin(), parsed.args.end());
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auto nixBin = canonPath(getEnvNonEmpty("NIX_BIN_DIR").value_or(NIX_BIN_DIR));
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auto process = RunningProcess::start(nixBin + "/nix", args);
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auto session = TestSession{std::string(AUTOMATION_PROMPT), std::move(process)};
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auto session = TestSession(std::string(AUTOMATION_PROMPT), std::move(process));
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for (auto & bit : syntax) {
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if (bit.kind != CLILiterateParser::NodeKind::COMMAND) {
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continue;
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for (auto & event : parsed.syntax) {
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std::visit(
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overloaded{
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[&](const cli_literate_parser::Command & e) {
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ASSERT_TRUE(session.waitForPrompt());
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if (e.text == ":quit") {
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// If we quit the repl explicitly, we won't have a
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// prompt when we're done.
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parsed.shouldStart = false;
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}
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if (!session.waitForPrompt()) {
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ASSERT_TRUE(false);
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session.runCommand(e.text);
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},
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[&](const auto & e) {},
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},
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event
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);
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}
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session.runCommand(bit.text);
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}
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if (!session.waitForPrompt()) {
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ASSERT_TRUE(false);
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if (parsed.shouldStart) {
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ASSERT_TRUE(session.waitForPrompt());
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}
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session.close();
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auto replacedOutLog = boost::algorithm::replace_all_copy(session.outLog, unitTestData, "TEST_DATA");
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auto replacedOutLog =
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boost::algorithm::replace_all_copy(session.outLog, unitTestData, "$TEST_DATA");
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auto cleanedOutLog = trimOutLog(replacedOutLog);
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auto parsedOutLog = CLILiterateParser::parse(std::string(AUTOMATION_PROMPT), cleanedOutLog, 0);
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auto parsedOutLog = cli_literate_parser::parse(
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std::string(cleanedOutLog),
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cli_literate_parser::Config{.prompt = std::string(AUTOMATION_PROMPT), .indent = 0}
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);
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parsedOutLog = CLILiterateParser::tidyOutputForComparison(std::move(parsedOutLog));
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syntax = CLILiterateParser::tidyOutputForComparison(std::move(syntax));
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auto expected = parsed.tidyOutputForComparison();
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auto actual = parsedOutLog.tidyOutputForComparison();
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ASSERT_EQ(parsedOutLog, syntax);
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ASSERT_EQ(expected, actual);
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}
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void runReplTestPath(const std::string_view & nameBase, std::vector<std::string> extraArgs)
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{
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auto nixPath = goldenMaster(nameBase + ".nix");
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if (pathExists(nixPath)) {
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extraArgs.push_back("-f");
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extraArgs.push_back(nixPath);
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}
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readTest(nameBase + ".test", [this, extraArgs](std::string input) {
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runReplTest(input, extraArgs);
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});
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}
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void runReplTestPath(const std::string_view & nameBase)
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{
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runReplTestPath(nameBase, {});
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}
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void runDebuggerTest(const std::string_view & nameBase)
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{
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runReplTestPath(nameBase, {"--debugger"});
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}
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};
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TEST_F(ReplSessionTest, parses)
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TEST_F(ReplSessionTest, round_trip)
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{
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writeTest("basic.test", [this]() {
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const std::string content = readFile(goldenMaster("basic.test"));
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auto parsed = cli_literate_parser::parse(
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content, cli_literate_parser::Config{.prompt = std::string(REPL_PROMPT)}
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);
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std::ostringstream out{};
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for (auto & node : parsed.syntax) {
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cli_literate_parser::unparseNode(out, node, true);
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}
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return out.str();
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});
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}
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TEST_F(ReplSessionTest, tidy)
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{
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writeTest("basic.ast", [this]() {
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const std::string content = readFile(goldenMaster("basic.test"));
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auto parser = CLILiterateParser{std::string(REPL_PROMPT)};
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parser.feed(content);
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auto parsed = cli_literate_parser::parse(
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content, cli_literate_parser::Config{.prompt = std::string(REPL_PROMPT)}
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);
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std::ostringstream out{};
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for (auto & bit : parser.syntax()) {
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out << bit.print() << "\n";
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for (auto & node : parsed.syntax) {
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out << debugNode(node) << "\n";
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}
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return out.str();
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});
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writeTest("basic_tidied.ast", [this]() {
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const std::string content = readFile(goldenMaster("basic.test"));
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auto syntax = CLILiterateParser::parse(std::string(REPL_PROMPT), content);
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syntax = CLILiterateParser::tidyOutputForComparison(std::move(syntax));
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auto parsed = cli_literate_parser::parse(
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content, cli_literate_parser::Config{.prompt = std::string(REPL_PROMPT)}
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);
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auto tidied = parsed.tidyOutputForComparison();
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std::ostringstream out{};
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for (auto & bit : syntax) {
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out << bit.print() << "\n";
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for (auto & node : tidied) {
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out << debugNode(node) << "\n";
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}
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return out.str();
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});
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}
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TEST_F(ReplSessionTest, repl_basic)
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{
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readTest("basic_repl.test", [this](std::string input) { runReplTest(input); });
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}
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#define DEBUGGER_TEST(name) \
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#define REPL_TEST(name) \
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TEST_F(ReplSessionTest, name) \
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{ \
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readTest(#name ".test", [this](std::string input) { \
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runReplTest(input, {"--debugger", "-f", goldenMaster(#name ".nix")}); \
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}); \
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runReplTestPath(#name); \
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}
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DEBUGGER_TEST(regression_9918);
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DEBUGGER_TEST(regression_9917);
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DEBUGGER_TEST(regression_l145);
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DEBUGGER_TEST(stack_vars);
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REPL_TEST(regression_9918);
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REPL_TEST(regression_9917);
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REPL_TEST(stack_vars);
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REPL_TEST(basic_repl);
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};
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}; // namespace nix
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|
|
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@ -1,4 +1,5 @@
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#include <iostream>
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#include <span>
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#include <unistd.h>
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#include "test-session.hh"
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|
|
@ -21,14 +22,17 @@ RunningProcess RunningProcess::start(std::string executable, Strings args)
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// This is separate from runProgram2 because we have different IO requirements
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pid_t pid = startProcess([&]() {
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if (dup2(procStdout.writeSide.get(), STDOUT_FILENO) == -1)
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if (dup2(procStdout.writeSide.get(), STDOUT_FILENO) == -1) {
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throw SysError("dupping stdout");
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if (dup2(procStdin.readSide.get(), STDIN_FILENO) == -1)
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}
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if (dup2(procStdin.readSide.get(), STDIN_FILENO) == -1) {
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throw SysError("dupping stdin");
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}
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procStdin.writeSide.close();
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procStdout.readSide.close();
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if (dup2(STDOUT_FILENO, STDERR_FILENO) == -1)
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if (dup2(STDOUT_FILENO, STDERR_FILENO) == -1) {
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throw SysError("dupping stderr");
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}
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execv(executable.c_str(), stringsToCharPtrs(args).data());
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throw SysError("exec did not happen");
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});
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@ -44,7 +48,8 @@ RunningProcess RunningProcess::start(std::string executable, Strings args)
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}
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[[gnu::unused]]
|
||||
std::ostream & operator<<(std::ostream & os, ReplOutputParser::State s)
|
||||
std::ostream &
|
||||
operator<<(std::ostream & os, ReplOutputParser::State s)
|
||||
{
|
||||
switch (s) {
|
||||
case ReplOutputParser::State::Prompt:
|
||||
|
|
@ -91,8 +96,7 @@ bool ReplOutputParser::feed(char c)
|
|||
return false;
|
||||
}
|
||||
|
||||
/** Waits for the prompt and then returns if a prompt was found */
|
||||
bool TestSession::waitForPrompt()
|
||||
bool TestSession::readOutThen(ReadOutThenCallback cb)
|
||||
{
|
||||
std::vector<char> buf(1024);
|
||||
|
||||
|
|
@ -106,38 +110,67 @@ bool TestSession::waitForPrompt()
|
|||
return false;
|
||||
}
|
||||
|
||||
switch (cb(std::span(buf.data(), res))) {
|
||||
case ReadOutThenCallbackResult::Stop:
|
||||
return true;
|
||||
case ReadOutThenCallbackResult::Continue:
|
||||
continue;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
bool TestSession::waitForPrompt()
|
||||
{
|
||||
bool notEof = readOutThen([&](std::span<char> s) -> ReadOutThenCallbackResult {
|
||||
bool foundPrompt = false;
|
||||
for (ssize_t i = 0; i < res; ++i) {
|
||||
|
||||
for (auto ch : s) {
|
||||
// foundPrompt = foundPrompt || outputParser.feed(buf[i]);
|
||||
bool wasEaten = true;
|
||||
eater.feed(buf[i], [&](char c) {
|
||||
eater.feed(ch, [&](char c) {
|
||||
wasEaten = false;
|
||||
foundPrompt = outputParser.feed(buf[i]) || foundPrompt;
|
||||
foundPrompt = outputParser.feed(ch) || foundPrompt;
|
||||
|
||||
outLog.push_back(c);
|
||||
});
|
||||
|
||||
if constexpr (DEBUG_REPL_PARSER) {
|
||||
std::cerr << "raw " << MaybeHexEscapedChar{buf[i]} << (wasEaten ? " [eaten]" : "") << "\n";
|
||||
std::cerr << "raw " << MaybeHexEscapedChar{ch} << (wasEaten ? " [eaten]" : "") << "\n";
|
||||
}
|
||||
}
|
||||
|
||||
if (foundPrompt) {
|
||||
return true;
|
||||
return foundPrompt ? ReadOutThenCallbackResult::Stop : ReadOutThenCallbackResult::Continue;
|
||||
});
|
||||
|
||||
return notEof;
|
||||
}
|
||||
|
||||
void TestSession::wait()
|
||||
{
|
||||
readOutThen([&](std::span<char> s) {
|
||||
for (auto ch : s) {
|
||||
eater.feed(ch, [&](char c) {
|
||||
outputParser.feed(c);
|
||||
outLog.push_back(c);
|
||||
});
|
||||
}
|
||||
// just keep reading till we hit eof
|
||||
return ReadOutThenCallbackResult::Continue;
|
||||
});
|
||||
}
|
||||
|
||||
void TestSession::close()
|
||||
{
|
||||
proc.procStdin.close();
|
||||
wait();
|
||||
proc.procStdout.close();
|
||||
}
|
||||
|
||||
void TestSession::runCommand(std::string command)
|
||||
{
|
||||
if constexpr (DEBUG_REPL_PARSER)
|
||||
if constexpr (DEBUG_REPL_PARSER) {
|
||||
std::cerr << "runCommand " << command << "\n";
|
||||
}
|
||||
command += "\n";
|
||||
// We have to feed a newline into the output parser, since Nix might not
|
||||
// give us a newline before a prompt in all cases (it might clear line
|
||||
|
|
|
|||
|
|
@ -1,7 +1,9 @@
|
|||
#pragma once
|
||||
///@file
|
||||
|
||||
#include <functional>
|
||||
#include <sched.h>
|
||||
#include <span>
|
||||
#include <string>
|
||||
|
||||
#include "util.hh"
|
||||
|
|
@ -22,8 +24,7 @@ struct RunningProcess
|
|||
class ReplOutputParser
|
||||
{
|
||||
public:
|
||||
ReplOutputParser(std::string prompt)
|
||||
: prompt(prompt)
|
||||
ReplOutputParser(std::string prompt) : prompt(prompt)
|
||||
{
|
||||
assert(!prompt.empty());
|
||||
}
|
||||
|
|
@ -60,10 +61,27 @@ struct TestSession
|
|||
{
|
||||
}
|
||||
|
||||
/** Waits for the prompt and then returns if a prompt was found */
|
||||
bool waitForPrompt();
|
||||
|
||||
/** Feeds a line of input into the command */
|
||||
void runCommand(std::string command);
|
||||
|
||||
/** Closes the session, closing standard input and waiting for standard
|
||||
* output to close, capturing any remaining output. */
|
||||
void close();
|
||||
|
||||
private:
|
||||
/** Waits until the command closes its output */
|
||||
void wait();
|
||||
|
||||
enum class ReadOutThenCallbackResult { Stop, Continue };
|
||||
using ReadOutThenCallback = std::function<ReadOutThenCallbackResult(std::span<char>)>;
|
||||
/** Reads some chunks of output, calling the callback provided for each
|
||||
* chunk and stopping if it returns Stop.
|
||||
*
|
||||
* @returns false if EOF, true if the callback requested we stop first.
|
||||
* */
|
||||
bool readOutThen(ReadOutThenCallback cb);
|
||||
};
|
||||
};
|
||||
|
|
|
|||
|
|
@ -8,7 +8,7 @@ libutil-test-support_INSTALL_DIR :=
|
|||
|
||||
libutil-test-support_SOURCES := $(wildcard $(d)/tests/*.cc)
|
||||
|
||||
libutil-test-support_CXXFLAGS += $(libutil-tests_EXTRA_INCLUDES)
|
||||
libutil-test-support_CXXFLAGS += $(libutil-tests_EXTRA_INCLUDES) -I src/libutil
|
||||
|
||||
# libexpr so we can steal their string printer from print.cc
|
||||
libutil-test-support_LIBS = libutil libexpr
|
||||
|
|
|
|||
|
|
@ -74,20 +74,20 @@ public:
|
|||
{
|
||||
auto file = goldenMaster(testStem);
|
||||
|
||||
auto got = test();
|
||||
auto actual = test();
|
||||
|
||||
if (testAccept())
|
||||
{
|
||||
createDirs(dirOf(file));
|
||||
writeFile2(file, got);
|
||||
writeFile2(file, actual);
|
||||
GTEST_SKIP()
|
||||
<< "Updating golden master "
|
||||
<< file;
|
||||
}
|
||||
else
|
||||
{
|
||||
decltype(got) expected = readFile2(file);
|
||||
ASSERT_EQ(got, expected);
|
||||
decltype(actual) expected = readFile2(file);
|
||||
ASSERT_EQ(expected, actual);
|
||||
}
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -1,248 +1,444 @@
|
|||
#include "cli-literate-parser.hh"
|
||||
#include "escape-string.hh"
|
||||
#include "libexpr/print.hh"
|
||||
#include "escape-char.hh"
|
||||
#include "libexpr/print.hh"
|
||||
#include "types.hh"
|
||||
#include "util.hh"
|
||||
#include <ranges>
|
||||
#include <boost/algorithm/string/replace.hpp>
|
||||
#include <boost/algorithm/string/trim.hpp>
|
||||
#include <iostream>
|
||||
#include <memory>
|
||||
#include <boost/algorithm/string/trim.hpp>
|
||||
#include <sstream>
|
||||
#include <variant>
|
||||
|
||||
using namespace std::string_literals;
|
||||
|
||||
namespace nix {
|
||||
#include "cli-literate-parser.hh"
|
||||
#include "escape-string.hh"
|
||||
#include "fmt.hh"
|
||||
#include "libexpr/print.hh"
|
||||
#include "shlex.hh"
|
||||
#include "types.hh"
|
||||
#include "util.hh"
|
||||
|
||||
static constexpr const bool DEBUG_PARSER = false;
|
||||
|
||||
constexpr auto CLILiterateParser::stateDebug(State const & s) -> const char *
|
||||
{
|
||||
return std::visit(
|
||||
overloaded{// clang-format off
|
||||
[](Indent const&) -> const char * { return "indent"; },
|
||||
[](Commentary const&) -> const char * { return "indent"; },
|
||||
[](Prompt const&) -> const char * { return "prompt"; },
|
||||
[](Command const&) -> const char * { return "command"; },
|
||||
[](OutputLine const&) -> const char * { return "output_line"; }},
|
||||
// clang-format on
|
||||
s);
|
||||
}
|
||||
using namespace std::string_literals;
|
||||
using namespace boost::algorithm;
|
||||
|
||||
auto CLILiterateParser::Node::print() const -> std::string
|
||||
{
|
||||
std::ostringstream s{};
|
||||
switch (kind) {
|
||||
case NodeKind::COMMENTARY:
|
||||
s << "Commentary ";
|
||||
break;
|
||||
case NodeKind::COMMAND:
|
||||
s << "Command ";
|
||||
break;
|
||||
case NodeKind::OUTPUT:
|
||||
s << "Output ";
|
||||
break;
|
||||
}
|
||||
escapeString(s, this->text);
|
||||
return s.str();
|
||||
}
|
||||
namespace nix {
|
||||
|
||||
void PrintTo(std::vector<CLILiterateParser::Node> const & nodes, std::ostream * os)
|
||||
{
|
||||
for (auto & node : nodes) {
|
||||
*os << node.print() << "\\n";
|
||||
}
|
||||
}
|
||||
namespace cli_literate_parser {
|
||||
|
||||
auto CLILiterateParser::parse(std::string prompt, std::string_view const & input, size_t indent) -> std::vector<Node>
|
||||
struct Parser
|
||||
{
|
||||
CLILiterateParser p{std::move(prompt), indent};
|
||||
p.feed(input);
|
||||
return std::move(p).intoSyntax();
|
||||
}
|
||||
|
||||
auto CLILiterateParser::intoSyntax() && -> std::vector<Node>
|
||||
{
|
||||
return std::move(this->syntax_);
|
||||
}
|
||||
|
||||
CLILiterateParser::CLILiterateParser(std::string prompt, size_t indent)
|
||||
: state_(indent == 0 ? State(Prompt{}) : State(Indent{}))
|
||||
, prompt_(prompt)
|
||||
, indent_(indent)
|
||||
, lastWasOutput_(false)
|
||||
, syntax_{}
|
||||
Parser(const std::string input, Config config)
|
||||
: input(input)
|
||||
, rest(this->input)
|
||||
, prompt(config.prompt)
|
||||
, indentString(std::string(config.indent, ' '))
|
||||
, lastWasOutput(false)
|
||||
, syntax{}
|
||||
{
|
||||
assert(!prompt.empty());
|
||||
}
|
||||
|
||||
void CLILiterateParser::feed(char c)
|
||||
const std::string input;
|
||||
std::string_view rest;
|
||||
const std::string prompt;
|
||||
const std::string indentString;
|
||||
|
||||
/** Last line was output, so we consider a blank to be part of the output */
|
||||
bool lastWasOutput;
|
||||
|
||||
/**
|
||||
* Nodes of syntax being built.
|
||||
*/
|
||||
std::vector<Node> syntax;
|
||||
|
||||
auto dbg(std::string_view state) -> void
|
||||
{
|
||||
std::cout << state << ": ";
|
||||
escapeString(
|
||||
std::cout,
|
||||
rest,
|
||||
{
|
||||
.maxLength = 40,
|
||||
.ansiColors = true,
|
||||
.escapeNonPrinting = true,
|
||||
}
|
||||
);
|
||||
std::cout << std::endl;
|
||||
}
|
||||
|
||||
template<typename T>
|
||||
auto pushNode(T node) -> void
|
||||
{
|
||||
if constexpr (DEBUG_PARSER) {
|
||||
std::cout << stateDebug(state_) << " " << MaybeHexEscapedChar{c} << "\n";
|
||||
std::cout << debugNode(node);
|
||||
}
|
||||
syntax.emplace_back(node);
|
||||
}
|
||||
|
||||
if (c == '\n') {
|
||||
onNewline();
|
||||
auto parseLiteral(const char c) -> bool
|
||||
{
|
||||
if (rest.starts_with(c)) {
|
||||
rest.remove_prefix(1);
|
||||
return true;
|
||||
} else {
|
||||
return false;
|
||||
}
|
||||
}
|
||||
|
||||
auto parseLiteral(const std::string_view & literal) -> bool
|
||||
{
|
||||
if (rest.starts_with(literal)) {
|
||||
rest.remove_prefix(literal.length());
|
||||
return true;
|
||||
} else {
|
||||
return false;
|
||||
}
|
||||
}
|
||||
|
||||
auto parseBool() -> bool
|
||||
{
|
||||
auto result = false;
|
||||
if (parseLiteral("true")) {
|
||||
result = true;
|
||||
} else if (parseLiteral("false")) {
|
||||
result = false;
|
||||
} else {
|
||||
throw ParseError("true or false", std::string(rest));
|
||||
}
|
||||
auto untilNewline = parseUntilNewline();
|
||||
if (!untilNewline.empty()) {
|
||||
throw ParseError("nothing after true or false", untilNewline);
|
||||
}
|
||||
return result;
|
||||
}
|
||||
|
||||
auto parseUntilNewline() -> std::string
|
||||
{
|
||||
auto pos = rest.find('\n');
|
||||
if (pos == std::string_view::npos) {
|
||||
throw ParseError("text and then newline", std::string(rest));
|
||||
} else {
|
||||
// `parseOutput()` sets this to true anyways.
|
||||
lastWasOutput = false;
|
||||
auto result = std::string(rest, 0, pos);
|
||||
rest.remove_prefix(pos + 1);
|
||||
return result;
|
||||
}
|
||||
}
|
||||
|
||||
auto parseIndent() -> bool
|
||||
{
|
||||
if constexpr (DEBUG_PARSER) {
|
||||
dbg("indent");
|
||||
}
|
||||
if (indentString.empty()) {
|
||||
return true;
|
||||
}
|
||||
|
||||
if (parseLiteral(indentString)) {
|
||||
pushNode(Indent(indentString));
|
||||
return true;
|
||||
} else {
|
||||
if constexpr (DEBUG_PARSER) {
|
||||
dbg("indent failed");
|
||||
}
|
||||
return false;
|
||||
}
|
||||
}
|
||||
|
||||
auto parseCommand() -> void
|
||||
{
|
||||
if constexpr (DEBUG_PARSER) {
|
||||
dbg("command");
|
||||
}
|
||||
auto untilNewline = parseUntilNewline();
|
||||
pushNode(Command(untilNewline));
|
||||
}
|
||||
|
||||
auto parsePrompt() -> void
|
||||
{
|
||||
if constexpr (DEBUG_PARSER) {
|
||||
dbg("prompt");
|
||||
}
|
||||
if (parseLiteral(prompt)) {
|
||||
pushNode(Prompt(prompt));
|
||||
if (rest.empty()) {
|
||||
return;
|
||||
}
|
||||
parseCommand();
|
||||
} else {
|
||||
parseOutput();
|
||||
}
|
||||
}
|
||||
|
||||
auto parseOutput() -> void
|
||||
{
|
||||
if constexpr (DEBUG_PARSER) {
|
||||
dbg("output");
|
||||
}
|
||||
auto untilNewline = parseUntilNewline();
|
||||
pushNode(Output(untilNewline));
|
||||
lastWasOutput = true;
|
||||
}
|
||||
|
||||
auto parseAtSign() -> void
|
||||
{
|
||||
if constexpr (DEBUG_PARSER) {
|
||||
dbg("@ symbol");
|
||||
}
|
||||
if (!parseLiteral('@')) {
|
||||
parseOutputOrCommentary();
|
||||
}
|
||||
|
||||
if (parseLiteral("args ")) {
|
||||
parseArgs();
|
||||
} else if (parseLiteral("should-start ")) {
|
||||
if constexpr (DEBUG_PARSER) {
|
||||
dbg("@should-start");
|
||||
}
|
||||
auto shouldStart = parseBool();
|
||||
pushNode(ShouldStart{shouldStart});
|
||||
}
|
||||
}
|
||||
|
||||
auto parseArgs() -> void
|
||||
{
|
||||
if constexpr (DEBUG_PARSER) {
|
||||
dbg("@args");
|
||||
}
|
||||
auto untilNewline = parseUntilNewline();
|
||||
pushNode(Args(untilNewline));
|
||||
}
|
||||
|
||||
auto parseOutputOrCommentary() -> void
|
||||
{
|
||||
if constexpr (DEBUG_PARSER) {
|
||||
dbg("output/commentary");
|
||||
}
|
||||
auto oldLastWasOutput = lastWasOutput;
|
||||
auto untilNewline = parseUntilNewline();
|
||||
|
||||
auto trimmed = trim_right_copy(untilNewline);
|
||||
|
||||
if (oldLastWasOutput && trimmed.empty()) {
|
||||
pushNode(Output{trimmed});
|
||||
} else {
|
||||
pushNode(Commentary{untilNewline});
|
||||
}
|
||||
}
|
||||
|
||||
auto parseStartOfLine() -> void
|
||||
{
|
||||
if constexpr (DEBUG_PARSER) {
|
||||
dbg("start of line");
|
||||
}
|
||||
if (parseIndent()) {
|
||||
parsePrompt();
|
||||
} else {
|
||||
parseAtSign();
|
||||
}
|
||||
}
|
||||
|
||||
auto parse() && -> ParseResult
|
||||
{
|
||||
// Begin the recursive descent parser at the start of a new line.
|
||||
while (!rest.empty()) {
|
||||
parseStartOfLine();
|
||||
}
|
||||
return std::move(*this).intoParseResult();
|
||||
}
|
||||
|
||||
auto intoParseResult() && -> ParseResult
|
||||
{
|
||||
// Do another pass over the nodes to produce auxiliary results like parsed
|
||||
// command line arguments.
|
||||
std::vector<std::string> args;
|
||||
std::vector<Node> newSyntax;
|
||||
auto shouldStart = true;
|
||||
|
||||
for (auto it = syntax.begin(); it != syntax.end(); ++it) {
|
||||
Node node = std::move(*it);
|
||||
std::visit(
|
||||
overloaded{
|
||||
[&](Indent & s) {
|
||||
if (c == ' ') {
|
||||
if (++s.pos >= indent_) {
|
||||
transition(Prompt{});
|
||||
}
|
||||
} else {
|
||||
transition(Commentary{AccumulatingState{.lineAccumulator = std::string{c}}});
|
||||
}
|
||||
[&](Args & e) {
|
||||
auto split = shell_split(std::string(e.text));
|
||||
args.insert(args.end(), split.begin(), split.end());
|
||||
},
|
||||
[&](Prompt & s) {
|
||||
if (s.pos >= prompt_.length()) {
|
||||
transition(Command{AccumulatingState{.lineAccumulator = std::string{c}}});
|
||||
return;
|
||||
} else if (c == prompt_[s.pos]) {
|
||||
// good prompt character
|
||||
++s.pos;
|
||||
} else {
|
||||
// didn't match the prompt, so it must have actually been output.
|
||||
s.lineAccumulator.push_back(c);
|
||||
transition(OutputLine{AccumulatingState{.lineAccumulator = std::move(s.lineAccumulator)}});
|
||||
return;
|
||||
}
|
||||
s.lineAccumulator.push_back(c);
|
||||
[&](ShouldStart & e) { shouldStart = e.shouldStart; },
|
||||
[&](auto & e) {},
|
||||
},
|
||||
[&](AccumulatingState & s) { s.lineAccumulator.push_back(c); }},
|
||||
state_);
|
||||
node
|
||||
);
|
||||
|
||||
newSyntax.push_back(node);
|
||||
}
|
||||
|
||||
void CLILiterateParser::onNewline()
|
||||
return ParseResult{
|
||||
.syntax = std::move(newSyntax),
|
||||
.args = std::move(args),
|
||||
.shouldStart = shouldStart,
|
||||
};
|
||||
}
|
||||
};
|
||||
|
||||
template<typename View>
|
||||
auto tidySyntax(View syntax) -> std::vector<Node>
|
||||
{
|
||||
State lastState = std::move(state_);
|
||||
bool newLastWasOutput = false;
|
||||
// Note: Setting `lastWasCommand` lets us trim blank lines at the start and
|
||||
// end of the output stream.
|
||||
auto lastWasCommand = true;
|
||||
std::vector<Node> newSyntax;
|
||||
|
||||
syntax_.push_back(std::visit(
|
||||
for (auto it = syntax.begin(); it != syntax.end(); ++it) {
|
||||
Node node = *it;
|
||||
// Only compare `Command` and `Output` nodes.
|
||||
if (std::visit([&](auto && e) { return !e.shouldCompare(); }, node)) {
|
||||
continue;
|
||||
}
|
||||
|
||||
// Remove blank lines before and after commands. This lets us keep nice
|
||||
// whitespace in the test files.
|
||||
auto shouldKeep = std::visit(
|
||||
overloaded{
|
||||
[&](Indent & s) {
|
||||
// XXX: technically this eats trailing spaces
|
||||
|
||||
// a newline following output is considered part of that output
|
||||
if (lastWasOutput_) {
|
||||
newLastWasOutput = true;
|
||||
return Node::mkOutput("");
|
||||
[&](Command & e) {
|
||||
lastWasCommand = true;
|
||||
auto trimmed = trim_right_copy(e.text);
|
||||
if (trimmed.empty()) {
|
||||
return false;
|
||||
} else {
|
||||
e.text = trimmed;
|
||||
return true;
|
||||
}
|
||||
return Node::mkCommentary("");
|
||||
},
|
||||
[&](Commentary & s) { return Node::mkCommentary(std::move(s.lineAccumulator)); },
|
||||
[&](Command & s) { return Node::mkCommand(std::move(s.lineAccumulator)); },
|
||||
[&](OutputLine & s) {
|
||||
newLastWasOutput = true;
|
||||
return Node::mkOutput(std::move(s.lineAccumulator));
|
||||
[&](Output & e) {
|
||||
std::string trimmed = trim_right_copy(e.text);
|
||||
if (lastWasCommand && trimmed.empty()) {
|
||||
// NB: Keep `lastWasCommand` true in this branch so we
|
||||
// can keep pruning empty output lines.
|
||||
return false;
|
||||
} else {
|
||||
e.text = trimmed;
|
||||
lastWasCommand = false;
|
||||
return true;
|
||||
}
|
||||
},
|
||||
[&](Prompt & s) {
|
||||
// INDENT followed by newline is also considered a blank output line
|
||||
return Node::mkOutput(std::move(s.lineAccumulator));
|
||||
}},
|
||||
lastState));
|
||||
[&](auto & e) {
|
||||
lastWasCommand = false;
|
||||
return false;
|
||||
},
|
||||
},
|
||||
node
|
||||
);
|
||||
|
||||
transition(Indent{});
|
||||
lastWasOutput_ = newLastWasOutput;
|
||||
}
|
||||
|
||||
void CLILiterateParser::feed(std::string_view s)
|
||||
{
|
||||
for (char ch : s) {
|
||||
feed(ch);
|
||||
if (shouldKeep) {
|
||||
newSyntax.push_back(node);
|
||||
}
|
||||
}
|
||||
|
||||
void CLILiterateParser::transition(State new_state)
|
||||
{
|
||||
// When we expect INDENT and we are parsing without indents, commentary
|
||||
// cannot exist, so we want to transition directly into PROMPT before
|
||||
// resuming normal processing.
|
||||
if (Indent * i = std::get_if<Indent>(&new_state); i != nullptr && indent_ == 0) {
|
||||
new_state = Prompt{AccumulatingState{}, i->pos};
|
||||
}
|
||||
|
||||
state_ = new_state;
|
||||
}
|
||||
|
||||
auto CLILiterateParser::syntax() const -> std::vector<Node> const &
|
||||
{
|
||||
return syntax_;
|
||||
}
|
||||
|
||||
auto CLILiterateParser::unparse(const std::string & prompt, const std::vector<Node> & syntax, size_t indent)
|
||||
-> std::string
|
||||
{
|
||||
std::string indent_str(indent, ' ');
|
||||
std::ostringstream out{};
|
||||
|
||||
for (auto & node : syntax) {
|
||||
switch (node.kind) {
|
||||
case NodeKind::COMMENTARY:
|
||||
out << node.text << "\n";
|
||||
break;
|
||||
case NodeKind::COMMAND:
|
||||
out << indent_str << prompt << node.text << "\n";
|
||||
break;
|
||||
case NodeKind::OUTPUT:
|
||||
out << indent_str << node.text << "\n";
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
return out.str();
|
||||
}
|
||||
|
||||
auto CLILiterateParser::tidyOutputForComparison(std::vector<Node> && syntax) -> std::vector<Node>
|
||||
{
|
||||
std::vector<Node> newSyntax{};
|
||||
|
||||
// Eat trailing newlines, so assume that the very end was actually a command
|
||||
bool lastWasCommand = true;
|
||||
bool newLastWasCommand = true;
|
||||
|
||||
auto v = std::ranges::reverse_view(syntax);
|
||||
|
||||
for (auto it = v.begin(); it != v.end(); ++it) {
|
||||
Node item = std::move(*it);
|
||||
|
||||
lastWasCommand = newLastWasCommand;
|
||||
// chomp commentary
|
||||
if (item.kind == NodeKind::COMMENTARY) {
|
||||
continue;
|
||||
}
|
||||
|
||||
if (item.kind == NodeKind::COMMAND) {
|
||||
newLastWasCommand = true;
|
||||
|
||||
if (item.text == "") {
|
||||
// chomp empty commands
|
||||
continue;
|
||||
}
|
||||
}
|
||||
|
||||
if (item.kind == NodeKind::OUTPUT) {
|
||||
// TODO: horrible
|
||||
bool nextIsCommand = (it + 1 == v.end()) ? false : (it + 1)->kind == NodeKind::COMMAND;
|
||||
std::string trimmedText = boost::algorithm::trim_right_copy(item.text);
|
||||
if ((lastWasCommand || nextIsCommand) && trimmedText == "") {
|
||||
// chomp empty text above or directly below commands
|
||||
continue;
|
||||
}
|
||||
|
||||
// real output, stop chomping
|
||||
newLastWasCommand = false;
|
||||
|
||||
item = Node::mkOutput(std::move(trimmedText));
|
||||
}
|
||||
newSyntax.push_back(std::move(item));
|
||||
}
|
||||
|
||||
std::reverse(newSyntax.begin(), newSyntax.end());
|
||||
return newSyntax;
|
||||
}
|
||||
|
||||
};
|
||||
auto ParseResult::tidyOutputForComparison() -> std::vector<Node>
|
||||
{
|
||||
auto reversed = tidySyntax(std::ranges::reverse_view(syntax));
|
||||
auto unreversed = tidySyntax(std::ranges::reverse_view(reversed));
|
||||
return unreversed;
|
||||
}
|
||||
|
||||
void ParseResult::interpolatePwd(std::string_view pwd)
|
||||
{
|
||||
std::vector<std::string> newArgs;
|
||||
for (auto & arg : args) {
|
||||
newArgs.push_back(replaceStrings(arg, "${PWD}", pwd));
|
||||
}
|
||||
args = std::move(newArgs);
|
||||
}
|
||||
|
||||
const char * ParseError::what() const noexcept
|
||||
{
|
||||
if (what_) {
|
||||
return what_->c_str();
|
||||
} else {
|
||||
auto escaped = escapeString(rest, {.maxLength = 256, .escapeNonPrinting = true});
|
||||
auto hint =
|
||||
new HintFmt("Parse error: Expected %1%, got:\n%2%", expected, Uncolored(escaped));
|
||||
what_ = hint->str();
|
||||
return what_->c_str();
|
||||
}
|
||||
}
|
||||
|
||||
auto parse(const std::string input, Config config) -> ParseResult
|
||||
{
|
||||
return Parser(input, config).parse();
|
||||
}
|
||||
|
||||
std::ostream & operator<<(std::ostream & output, const Args & node)
|
||||
{
|
||||
return output << "@args " << node.text;
|
||||
}
|
||||
|
||||
std::ostream & operator<<(std::ostream & output, const ShouldStart & node)
|
||||
{
|
||||
return output << "@should-start " << (node.shouldStart ? "true" : "false");
|
||||
}
|
||||
|
||||
std::ostream & operator<<(std::ostream & output, const TextNode & rhs)
|
||||
{
|
||||
return output << rhs.text;
|
||||
}
|
||||
|
||||
void unparseNode(std::ostream & output, const Node & node, bool withNewline)
|
||||
{
|
||||
std::visit(
|
||||
[&](const auto & n) { output << n << (withNewline && n.emitNewlineAfter() ? "\n" : ""); },
|
||||
node
|
||||
);
|
||||
}
|
||||
|
||||
template<typename T>
|
||||
std::string gtestFormat(T & value)
|
||||
{
|
||||
std::ostringstream formatted;
|
||||
unparseNode(formatted, value, true);
|
||||
auto str = formatted.str();
|
||||
// Needs to be the literal string `\n` and not a newline character to
|
||||
// trigger gtest diff printing. Yes seriously.
|
||||
boost::algorithm::replace_all(str, "\n", "\\n");
|
||||
return str;
|
||||
}
|
||||
|
||||
void PrintTo(const std::vector<Node> & nodes, std::ostream * output)
|
||||
{
|
||||
for (auto & node : nodes) {
|
||||
*output << gtestFormat(node);
|
||||
}
|
||||
}
|
||||
|
||||
std::string debugNode(const Node & node)
|
||||
{
|
||||
std::ostringstream output;
|
||||
output << std::visit([](const auto & n) { return n.kind(); }, node) << ": ";
|
||||
std::ostringstream contents;
|
||||
unparseNode(contents, node, false);
|
||||
escapeString(output, contents.str(), {.escapeNonPrinting = true});
|
||||
return output.str();
|
||||
}
|
||||
|
||||
auto ParseResult::debugPrint(std::ostream & output) -> void
|
||||
{
|
||||
::nix::cli_literate_parser::debugPrint(output, syntax);
|
||||
}
|
||||
|
||||
void debugPrint(std::ostream & output, std::vector<Node> & nodes)
|
||||
{
|
||||
for (auto & node : nodes) {
|
||||
output << debugNode(node) << std::endl;
|
||||
}
|
||||
}
|
||||
|
||||
} // namespace cli_literate_parser
|
||||
} // namespace nix
|
||||
|
|
|
|||
|
|
@ -3,132 +3,195 @@
|
|||
|
||||
#include <compare>
|
||||
#include <memory>
|
||||
#include <optional>
|
||||
#include <sstream>
|
||||
#include <string>
|
||||
#include <variant>
|
||||
#include <vector>
|
||||
#include <string>
|
||||
|
||||
namespace nix {
|
||||
namespace cli_literate_parser {
|
||||
|
||||
// ------------------------- NODES -------------------------
|
||||
//
|
||||
// To update golden test files while preserving commentary output and other `@`
|
||||
// directives, we need to keep commentary output around after parsing.
|
||||
|
||||
struct BaseNode {
|
||||
virtual ~BaseNode() = default;
|
||||
|
||||
virtual auto shouldCompare() const -> bool { return false; }
|
||||
|
||||
virtual auto kind() const -> std::string = 0;
|
||||
virtual auto emitNewlineAfter() const -> bool = 0;
|
||||
|
||||
auto operator<=>(const BaseNode &rhs) const = default;
|
||||
};
|
||||
|
||||
/**
|
||||
* A node containing text. The text should be identical to how the node was
|
||||
* written in the input file.
|
||||
*/
|
||||
struct TextNode : BaseNode {
|
||||
std::string text;
|
||||
|
||||
explicit TextNode(std::string text) : text(text) {}
|
||||
};
|
||||
|
||||
std::ostream &operator<<(std::ostream &output, const TextNode &node);
|
||||
|
||||
#define DECLARE_TEXT_NODE(NAME, NEEDS_NEWLINE, SHOULD_COMPARE) \
|
||||
struct NAME : TextNode { \
|
||||
using TextNode::TextNode; \
|
||||
~NAME() override = default; \
|
||||
\
|
||||
auto kind() const -> std::string override { return #NAME; } \
|
||||
auto emitNewlineAfter() const -> bool override { return NEEDS_NEWLINE; } \
|
||||
auto shouldCompare() const -> bool override { return SHOULD_COMPARE; } \
|
||||
};
|
||||
|
||||
/* name, needsNewline, shouldCompare */
|
||||
DECLARE_TEXT_NODE(Prompt, false, false)
|
||||
DECLARE_TEXT_NODE(Command, true, true)
|
||||
DECLARE_TEXT_NODE(Output, true, true)
|
||||
DECLARE_TEXT_NODE(Commentary, true, false)
|
||||
DECLARE_TEXT_NODE(Args, true, false)
|
||||
DECLARE_TEXT_NODE(Indent, false, false)
|
||||
|
||||
#undef DECLARE_TEXT_NODE
|
||||
|
||||
struct ShouldStart : BaseNode {
|
||||
bool shouldStart;
|
||||
|
||||
ShouldStart(bool shouldStart) : shouldStart(shouldStart) {}
|
||||
~ShouldStart() override = default;
|
||||
auto emitNewlineAfter() const -> bool override { return true; }
|
||||
auto kind() const -> std::string override { return "should-start"; }
|
||||
|
||||
auto operator<=>(const ShouldStart &rhs) const = default;
|
||||
};
|
||||
std::ostream &operator<<(std::ostream &output, const ShouldStart &node);
|
||||
|
||||
/**
|
||||
* Any syntax node, including those that are cosmetic.
|
||||
*/
|
||||
using Node = std::variant<Prompt, Command, Output, Commentary, Args,
|
||||
ShouldStart, Indent>;
|
||||
|
||||
/** Unparses a node into the exact text that would have created it, including a
|
||||
* newline at the end if present, if withNewline is set */
|
||||
void unparseNode(std::ostream &output, const Node &node,
|
||||
bool withNewline = true);
|
||||
|
||||
std::string debugNode(const Node &node);
|
||||
void debugPrint(std::ostream &output, std::vector<Node> &nodes);
|
||||
|
||||
/**
|
||||
* Override gtest printing for lists of nodes.
|
||||
*/
|
||||
void PrintTo(std::vector<Node> const &nodes, std::ostream *output);
|
||||
|
||||
/**
|
||||
* The result of parsing a test file.
|
||||
*/
|
||||
struct ParseResult {
|
||||
/**
|
||||
* A set of nodes that can be used to reproduce the input file. This is used
|
||||
* to implement updating the test files.
|
||||
*/
|
||||
std::vector<Node> syntax;
|
||||
|
||||
/**
|
||||
* Extra CLI arguments.
|
||||
*/
|
||||
std::vector<std::string> args;
|
||||
|
||||
/**
|
||||
* Should the program start successfully?
|
||||
*/
|
||||
bool shouldStart = false;
|
||||
|
||||
/**
|
||||
* Replace `$PWD` with the given value in `args`.
|
||||
*/
|
||||
void interpolatePwd(std::string_view pwd);
|
||||
|
||||
/**
|
||||
* Tidy `syntax` to remove unnecessary nodes.
|
||||
*/
|
||||
auto tidyOutputForComparison() -> std::vector<Node>;
|
||||
|
||||
auto debugPrint(std::ostream &output) -> void;
|
||||
};
|
||||
|
||||
/**
|
||||
* A parse error.
|
||||
*/
|
||||
struct ParseError : std::exception {
|
||||
std::string expected;
|
||||
std::string rest;
|
||||
|
||||
ParseError(std::string expected, std::string rest)
|
||||
: expected(expected), rest(rest) {}
|
||||
|
||||
const char *what() const noexcept override;
|
||||
|
||||
private:
|
||||
/**
|
||||
* Cached formatted contents of `what()`.
|
||||
*/
|
||||
mutable std::optional<std::string> what_;
|
||||
};
|
||||
|
||||
struct Config {
|
||||
/**
|
||||
* The prompt string to look for.
|
||||
*/
|
||||
std::string prompt;
|
||||
/**
|
||||
* The number of spaces of indent for commands and output.
|
||||
*/
|
||||
size_t indent = 2;
|
||||
};
|
||||
|
||||
/*
|
||||
* A DFA parser for literate test cases for CLIs.
|
||||
* A recursive descent parser for literate test cases for CLIs.
|
||||
*
|
||||
* FIXME: implement merging of these, so you can auto update cases that have
|
||||
* comments.
|
||||
*
|
||||
* Format:
|
||||
* COMMENTARY
|
||||
* INDENT PROMPT COMMAND
|
||||
* INDENT OUTPUT
|
||||
* Syntax:
|
||||
* ```
|
||||
* ( COMMENTARY
|
||||
* | INDENT PROMPT COMMAND
|
||||
* | INDENT OUTPUT
|
||||
* | @args ARGS
|
||||
* | @should-start ( true | false )) *
|
||||
* ```
|
||||
*
|
||||
* e.g.
|
||||
* ```
|
||||
* commentary commentary commentary
|
||||
* @args --foo
|
||||
* @should-start false
|
||||
* nix-repl> :t 1
|
||||
* an integer
|
||||
* ```
|
||||
*
|
||||
* Yields:
|
||||
* Yields something like:
|
||||
* ```
|
||||
* Commentary "commentary commentary commentary"
|
||||
* Args "--foo"
|
||||
* ShouldStart false
|
||||
* Command ":t 1"
|
||||
* Output "an integer"
|
||||
* ```
|
||||
*
|
||||
* Note: one Output line is generated for each line of the sources, because
|
||||
* this is effectively necessary to be able to align them in the future to
|
||||
* auto-update tests.
|
||||
*/
|
||||
class CLILiterateParser
|
||||
{
|
||||
public:
|
||||
auto parse(std::string input, Config config) -> ParseResult;
|
||||
|
||||
enum class NodeKind {
|
||||
COMMENTARY,
|
||||
COMMAND,
|
||||
OUTPUT,
|
||||
};
|
||||
|
||||
struct Node
|
||||
{
|
||||
NodeKind kind;
|
||||
std::string text;
|
||||
std::strong_ordering operator<=>(Node const &) const = default;
|
||||
|
||||
static Node mkCommentary(std::string text)
|
||||
{
|
||||
return Node{.kind = NodeKind::COMMENTARY, .text = text};
|
||||
}
|
||||
|
||||
static Node mkCommand(std::string text)
|
||||
{
|
||||
return Node{.kind = NodeKind::COMMAND, .text = text};
|
||||
}
|
||||
|
||||
static Node mkOutput(std::string text)
|
||||
{
|
||||
return Node{.kind = NodeKind::OUTPUT, .text = text};
|
||||
}
|
||||
|
||||
auto print() const -> std::string;
|
||||
};
|
||||
|
||||
CLILiterateParser(std::string prompt, size_t indent = 2);
|
||||
|
||||
auto syntax() const -> std::vector<Node> const &;
|
||||
|
||||
/** Feeds a character into the parser */
|
||||
void feed(char c);
|
||||
|
||||
/** Feeds a string into the parser */
|
||||
void feed(std::string_view s);
|
||||
|
||||
/** Parses an input in a non-streaming fashion */
|
||||
static auto parse(std::string prompt, std::string_view const & input, size_t indent = 2) -> std::vector<Node>;
|
||||
|
||||
/** Returns, losslessly, the string that would have generated a syntax tree */
|
||||
static auto unparse(std::string const & prompt, std::vector<Node> const & syntax, size_t indent = 2) -> std::string;
|
||||
|
||||
/** Consumes a CLILiterateParser and gives you the syntax out of it */
|
||||
auto intoSyntax() && -> std::vector<Node>;
|
||||
|
||||
/** Tidies syntax to remove trailing whitespace from outputs and remove any
|
||||
* empty prompts */
|
||||
static auto tidyOutputForComparison(std::vector<Node> && syntax) -> std::vector<Node>;
|
||||
|
||||
private:
|
||||
|
||||
struct AccumulatingState
|
||||
{
|
||||
std::string lineAccumulator;
|
||||
};
|
||||
struct Indent
|
||||
{
|
||||
size_t pos = 0;
|
||||
};
|
||||
struct Commentary : public AccumulatingState
|
||||
{};
|
||||
struct Prompt : AccumulatingState
|
||||
{
|
||||
size_t pos = 0;
|
||||
};
|
||||
struct Command : public AccumulatingState
|
||||
{};
|
||||
struct OutputLine : public AccumulatingState
|
||||
{};
|
||||
|
||||
using State = std::variant<Indent, Commentary, Prompt, Command, OutputLine>;
|
||||
State state_;
|
||||
|
||||
constexpr static auto stateDebug(State const&) -> const char *;
|
||||
|
||||
const std::string prompt_;
|
||||
const size_t indent_;
|
||||
|
||||
/** Last line was output, so we consider a blank to be part of the output */
|
||||
bool lastWasOutput_;
|
||||
|
||||
std::vector<Node> syntax_;
|
||||
|
||||
void transition(State newState);
|
||||
void onNewline();
|
||||
};
|
||||
|
||||
// Override gtest printing for lists of nodes
|
||||
void PrintTo(std::vector<CLILiterateParser::Node> const & nodes, std::ostream * os);
|
||||
};
|
||||
}; // namespace cli_literate_parser
|
||||
}; // namespace nix
|
||||
|
|
|
|||
Loading…
Reference in a new issue