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| author | Ryo Nihei <nihei.dev@gmail.com> | 2022-03-29 21:52:47 +0900 |
|---|---|---|
| committer | Ryo Nihei <nihei.dev@gmail.com> | 2022-03-29 22:12:37 +0900 |
| commit | 90f28b5f7e7ef08e107e38002d122825764aad09 (patch) | |
| tree | d80dfc08063727caa48fac4f28a929cb669c1465 /README.md | |
| parent | Change syntax of production directives (diff) | |
| download | urubu-90f28b5f7e7ef08e107e38002d122825764aad09.tar.gz urubu-90f28b5f7e7ef08e107e38002d122825764aad09.tar.xz | |
Move directives given to lexical productions
Move all directives given to lexical productions from alternative directives to production directives.
This change aims to ensure consistency with respect to the syntax of definitions of terminal symbols and non-terminal symbols.
Diffstat (limited to 'README.md')
| -rw-r--r-- | README.md | 37 |
1 files changed, 22 insertions, 15 deletions
@@ -36,7 +36,7 @@ expr | expr mul expr | expr div expr | func_call - | integer + | int | id | '(' expr ')' #ast expr ; @@ -49,13 +49,20 @@ args | expr ; -whitespaces: "[\u{0009}\u{0020}]+" #skip; -integer: "0|[1-9][0-9]*"; -id: "[A-Za-z_][0-9A-Za-z_]*"; -add: '+'; -sub: '-'; -mul: '*'; -div: '/'; +ws #skip + : "[\u{0009}\u{0020}]+"; +int + : "0|[1-9][0-9]*"; +id + : "[A-Za-z_][0-9A-Za-z_]*"; +add + : '+'; +sub + : '-'; +mul + : '*'; +div + : '/'; ``` Save the above grammar to a file in UTF-8. In this explanation, the file name is `expr.vr`. @@ -87,7 +94,7 @@ expr │ ├─ id "foo" │ └─ args │ ├─ expr -│ │ └─ integer "10" +│ │ └─ int "10" │ └─ expr │ └─ func_call │ ├─ id "bar" @@ -97,7 +104,7 @@ expr ├─ add "+" └─ expr ├─ expr - │ └─ integer "99" + │ └─ int "99" ├─ mul "*" └─ expr └─ id "x" @@ -126,8 +133,8 @@ LALR(1) 3 - - x_1 (\() 4 - - x_2 (\)) 5 - - x_3 (,) - 6 - - whitespaces - 7 - - integer + 6 - - ws + 7 - - int 8 - - id 9 2 l add (+) 10 2 l sub (-) @@ -142,7 +149,7 @@ LALR(1) 4 1 l expr → expr * expr 5 1 l expr → expr / expr 6 - - expr → func_call - 7 - - expr → integer + 7 - - expr → int 8 - - expr → id 9 - - expr → \( expr \) 10 - - func_call → id \( args \) @@ -157,7 +164,7 @@ LALR(1) 1 expr' → ・ expr shift 3 on \( -shift 4 on integer +shift 4 on int shift 5 on id goto 1 on expr goto 2 on func_call @@ -289,7 +296,7 @@ expr │ └─ id "foo" ├─ add "+" └─ expr - └─ integer "99" + └─ int "99" ``` ```sh |