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cgo: create skeleton of a Pratt parser

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This converts the existing const parser to the basics of a Pratt parser,
following the book "Writing An Interpreter In Go" by Thorsten Ball. It
doesn't really do anything interesting yet, it simply converts the
existing code (with existing tests) to the new structure.
This commit is contained in:
Ayke van Laethem
2021-05-20 14:25:25 +02:00
committed by Ron Evans
parent a38b5c4e01
commit 3339d0f47e
2 changed files with 59 additions and 38 deletions
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cgo/const_test.go
+2 -2
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@@ -18,7 +18,7 @@ func TestParseConst(t *testing.T) {
{`(5)`, `(5)`},
{`(((5)))`, `(5)`},
{`)`, `error: 1:1: unexpected token )`},
{`5)`, `error: 1:2: unexpected token )`},
{`5)`, `error: 1:2: unexpected token ), expected end of expression`},
{" \t)", `error: 1:4: unexpected token )`},
{`5.8f`, `5.8`},
{`foo`, `C.foo`},
@@ -30,7 +30,7 @@ func TestParseConst(t *testing.T) {
{`'a'`, `'a'`},
{`0b10`, `0b10`},
{`0x1234_5678`, `0x1234_5678`},
{`5 5`, `error: 1:3: unexpected token INT`}, // test for a bugfix
{`5 5`, `error: 1:3: unexpected token INT, expected end of expression`}, // test for a bugfix
} {
fset := token.NewFileSet()
startPos := fset.AddFile("", -1, 1000).Pos(0)