mirror of
https://github.com/go-sylixos/elvish.git
synced 2024-12-14 11:17:52 +08:00
358 lines
9.6 KiB
Go
358 lines
9.6 KiB
Go
package parse
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import (
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"fmt"
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"os"
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"reflect"
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"strings"
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"testing"
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"github.com/elves/elvish/errutil"
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)
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type fs map[string]interface{}
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type ast struct {
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name string
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fields fs
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}
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func a(c ...interface{}) ast {
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return ast{"Chunk/Pipeline/Form", fs{"Head": "a", "Args": c}}
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}
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var goodCases = []struct {
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src string
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ast ast
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}{
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// Chunk
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{"a;b|c\n;d", ast{"Chunk", fs{"Pipelines": []string{"a", "b|c", "d"}}}},
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// Empty chunk
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{"", ast{"Chunk", nil}},
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// Lots of unnecessary whitespaces
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{" ;\n\n ls \t ;\n", ast{"Chunk", fs{"Pipelines": []string{"ls \t "}}}},
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// Form
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{"ls x y", ast{"Chunk/Pipeline/Form", fs{
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"Head": "ls",
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"Args": []string{"x", "y"}}}},
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// Redirections
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{"a>b", ast{"Chunk/Pipeline/Form", fs{
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"Head": "a",
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"Redirs": []ast{
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ast{"Redir", fs{"Mode": Write, "Source": "b"}}},
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}}},
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// More redirections
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{"a>>b 2>b 3>&- 4>&1", ast{"Chunk/Pipeline/Form", fs{
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"Head": "a",
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"Redirs": []ast{
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ast{"Redir", fs{"Mode": Append, "Source": "b"}},
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ast{"Redir", fs{"Mode": Write, "Source": "b"}},
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ast{"Redir", fs{"Mode": Write, "SourceIsFd": true, "Source": "-"}},
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ast{"Redir", fs{"Mode": Write, "SourceIsFd": true, "Source": "1"}},
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},
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}}},
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// Exitus redirection
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{"a ?>$e", ast{"Chunk/Pipeline/Form", fs{
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"Head": "a",
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"ExitusRedir": ast{"ExitusRedir", fs{"Dest": "$e"}},
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}}},
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// Assignments:
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{"k=v k[a][b]=v a", ast{"Chunk/Pipeline/Form", fs{
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"Assignments": []string{"k=v", "k[a][b]=v"},
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"Head": "a"}}},
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// Compound
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{`a b"foo"$c'xyz'`, a(ast{"Compound", fs{
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"Indexings": []string{"b", `"foo"`, "$c", "'xyz'"}}})},
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// Indexing
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{"a $b[c][d][e]", a(ast{"Compound/Indexing", fs{
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"Head": "$b", "Indicies": []string{"c", "d", "e"},
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}})},
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// Primary
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//
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// Single quote
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{"a 'b'", a(ast{"Compound/Indexing/Primary", fs{
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"text": "'b'", "Type": SingleQuoted,
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}})},
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// Double quote
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{`a "b"`, a(ast{"Compound/Indexing/Primary", fs{
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"text": `"b"`, "Type": DoubleQuoted,
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}})},
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// List
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{"a [] [ ] [1] [ 2] [3 ] [ 4 5 6 7 ]", a(
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ast{"Compound/Indexing/Primary", fs{"Type": List}},
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ast{"Compound/Indexing/Primary", fs{"Type": List}},
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ast{"Compound/Indexing/Primary", fs{
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"Type": List,
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"List": ast{"Array", fs{"Compounds": []string{"1"}}}}},
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ast{"Compound/Indexing/Primary", fs{
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"Type": List,
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"List": ast{"Array", fs{"Compounds": []string{"2"}}}}},
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ast{"Compound/Indexing/Primary", fs{
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"Type": List,
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"List": ast{"Array", fs{"Compounds": []string{"3"}}}}},
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ast{"Compound/Indexing/Primary", fs{
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"Type": List,
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"List": ast{"Array", fs{
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"Compounds": []string{"4", "5", "6", "7"}}}}},
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)},
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// Map
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{"a [&k v] [ &k v] [&k v ] [ &k v ] [&a b &c d &e f]", a(
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ast{"Compound/Indexing/Primary", fs{
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"Type": Map,
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"MapPairs": []ast{ast{"MapPair", fs{"Key": "k", "Value": "v"}}}}},
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ast{"Compound/Indexing/Primary", fs{
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"Type": Map,
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"MapPairs": []ast{ast{"MapPair", fs{"Key": "k", "Value": "v"}}}}},
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ast{"Compound/Indexing/Primary", fs{
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"Type": Map,
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"MapPairs": []ast{ast{"MapPair", fs{"Key": "k", "Value": "v"}}}}},
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ast{"Compound/Indexing/Primary", fs{
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"Type": Map,
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"MapPairs": []ast{ast{"MapPair", fs{"Key": "k", "Value": "v"}}}}},
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ast{"Compound/Indexing/Primary", fs{
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"Type": Map,
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"MapPairs": []ast{
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ast{"MapPair", fs{"Key": "a", "Value": "b"}},
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ast{"MapPair", fs{"Key": "c", "Value": "d"}},
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ast{"MapPair", fs{"Key": "e", "Value": "f"}},
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}}},
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)},
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// Empty map
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{"a [&] [ &] [& ] [ & ]", a(
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ast{"Compound/Indexing/Primary", fs{"Type": Map, "text": "[&]"}},
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ast{"Compound/Indexing/Primary", fs{"Type": Map, "text": "[ &]"}},
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ast{"Compound/Indexing/Primary", fs{"Type": Map, "text": "[& ]"}},
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ast{"Compound/Indexing/Primary", fs{"Type": Map, "text": "[ & ]"}},
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)},
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// Lambda
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{"a []{} [ ]{ } []{ echo 233 } [ $x $y ]{puts $x $y} { put $1}", a(
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ast{"Compound/Indexing/Primary", fs{
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"Type": Lambda,
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}},
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ast{"Compound/Indexing/Primary", fs{
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"Type": Lambda,
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}},
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ast{"Compound/Indexing/Primary", fs{
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"Type": Lambda,
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"Chunk": " echo 233 ",
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}},
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ast{"Compound/Indexing/Primary", fs{
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"Type": Lambda,
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"List": "$x $y ",
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"Chunk": "puts $x $y",
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}},
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ast{"Compound/Indexing/Primary", fs{
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"Type": Lambda,
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"Chunk": " put $1",
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}},
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)},
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// Output capture
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{"a () (b;c)", a(
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ast{"Compound/Indexing/Primary", fs{"Type": OutputCapture}},
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ast{"Compound/Indexing/Primary", fs{
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"Type": OutputCapture, "Chunk": "b;c",
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}})},
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// Output capture with backquotes
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{"a `` `b;c` `e>f`", a("``", "`b;c`", "`e>f`")},
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// Backquotes may be nested with unclosed parens and braces
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{"a `a (b `c`)` `d [`e`]`", a("`a (b `c`)`", "`d [`e`]`")},
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// Exitus capture
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{"a ?() ?(b;c)", a(
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ast{"Compound/Indexing/Primary", fs{"Type": ErrorCapture}},
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ast{"Compound/Indexing/Primary", fs{
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"Type": ErrorCapture, "Chunk": "b;c",
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}})},
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// Braced
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{"a {a,c-f}", a(
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ast{"Compound/Indexing/Primary", fs{
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"Type": Braced,
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"Braced": []string{"a", "c", "f"},
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"IsRange": []bool{false, true}}})},
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// Tilde
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{"a ~xiaq/go", a(
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ast{"Compound", fs{
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"Indexings": []ast{
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{"Indexing/Primary", fs{"Type": Tilde}},
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{"Indexing/Primary", fs{"Type": Bareword, "Value": "xiaq/go"}},
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},
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}},
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)},
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}
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func TestParse(t *testing.T) {
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for _, tc := range goodCases {
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bn, err := Parse(tc.src)
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if err != nil {
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t.Errorf("Parse(%q) returns error: %v", tc.src, err)
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}
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err = checkParseTree(bn)
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if err != nil {
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t.Errorf("Parse(%q) returns bad parse tree: %v", tc.src, err)
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fmt.Fprintf(os.Stderr, "Parse tree of %q:\n", tc.src)
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PprintParseTree(bn, os.Stderr)
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}
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err = checkAST(bn, tc.ast)
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if err != nil {
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t.Errorf("Parse(%q) returns bad AST: %v", tc.src, err)
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fmt.Fprintf(os.Stderr, "AST of %q:\n", tc.src)
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PprintAST(bn, os.Stderr)
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}
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}
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}
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// checkParseTree checks whether the parse tree part of a Node is well-formed.
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func checkParseTree(n Node) error {
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children := n.Children()
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if len(children) == 0 {
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return nil
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}
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// Parent pointers of all children should point to me.
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for i, ch := range children {
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if ch.Parent() != n {
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return fmt.Errorf("parent of child %d (%s) is wrong: %s", i, summary(ch), summary(n))
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}
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}
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// The Begin of the first child should be equal to mine.
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if children[0].Begin() != n.Begin() {
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return fmt.Errorf("gap between node and first child: %s", summary(n))
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}
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// The End of the last child should be equal to mine.
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nch := len(children)
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if children[nch-1].End() != n.End() {
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return fmt.Errorf("gap between node and last child: %s", summary(n))
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}
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// Consecutive children have consecutive position ranges.
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for i := 0; i < nch-1; i++ {
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if children[i].End() != children[i+1].Begin() {
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return fmt.Errorf("gap beteen child %d and %d of: %s", i, i+1, summary(n))
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}
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}
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// Check children recursively.
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for _, ch := range n.Children() {
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err := checkParseTree(ch)
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if err != nil {
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return err
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}
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}
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return nil
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}
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// checkAST checks whether the AST part of a Node matches a specification.
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func checkAST(n Node, want ast) error {
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// TODO: Check fields present in struct but not in ast
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wantnames := strings.Split(want.name, "/")
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// Check coalesced levels
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for i, wantname := range wantnames {
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name := reflect.TypeOf(n).Elem().Name()
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if wantname != name {
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return fmt.Errorf("want %s, got %s (%s)", wantname, name, summary(n))
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}
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if i == len(wantnames)-1 {
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break
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}
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fields := n.Children()
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if len(fields) != 1 {
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return fmt.Errorf("want exactly 1 child, got %d (%s)", len(fields), summary(n))
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}
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n = fields[0]
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}
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if want.fields == nil && len(n.Children()) != 0 {
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return fmt.Errorf("want leaf, got inner node (%s)", summary(n))
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}
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nv := reflect.ValueOf(n).Elem()
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for fieldname, wantfield := range want.fields {
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if fieldname == "text" {
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if n.SourceText() != wantfield.(string) {
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return fmt.Errorf("want %q, got %q (%s)", wantfield, n.SourceText())
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}
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} else {
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fv := nv.FieldByName(fieldname)
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err := checkAny(fv.Interface(), wantfield, summary(n))
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if err != nil {
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return err
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}
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}
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}
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return nil
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}
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var nodeType = reflect.TypeOf((*Node)(nil)).Elem()
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func checkAny(got interface{}, want interface{}, ctx string) error {
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if got, ok := got.(Node); ok {
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// A Node
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return checkNode(got.(Node), want)
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}
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tgot := reflect.TypeOf(got)
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if tgot.Kind() == reflect.Slice && tgot.Elem().Implements(nodeType) {
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// A slice of Nodes
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vgot := reflect.ValueOf(got)
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vwant := reflect.ValueOf(want)
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if vgot.Len() != vwant.Len() {
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return fmt.Errorf("want %d, got %d (%s)", vwant.Len(), vgot.Len(), ctx)
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}
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for i := 0; i < vgot.Len(); i++ {
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err := checkNode(vgot.Index(i).Interface().(Node),
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vwant.Index(i).Interface())
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if err != nil {
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return err
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}
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}
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return nil
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}
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if !reflect.DeepEqual(want, got) {
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return fmt.Errorf("want %v, got %v (%s)", want, got, ctx)
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}
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return nil
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}
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func checkNode(got Node, want interface{}) error {
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switch want := want.(type) {
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case string:
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text := got.SourceText()
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if want != text {
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return fmt.Errorf("want %q, got %q (%s)", want, text, summary(got))
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}
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return nil
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case ast:
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return checkAST(got, want)
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default:
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panic(fmt.Sprintf("bad want type %T (%s)", want, summary(got)))
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}
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}
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var badCases = []struct {
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src string
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pos int // expected Begin position of first error
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}{
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// Unopened parens.
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{")", 0}, {"]", 0}, {"}", 0},
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// Unclosed parens.
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{"a (", 3}, {"a [", 3}, {"a {", 3},
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// Ampersand
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{"a &", 3}, {"a [&", 4},
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}
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func TestParseError(t *testing.T) {
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for _, tc := range badCases {
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_, err := Parse(tc.src)
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if err == nil {
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t.Errorf("Parse(%q) returns no error", tc.src)
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continue
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}
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posErr0 := err.(*errutil.Errors).Errors[0].(*errutil.PosError)
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if posErr0.Begin != tc.pos {
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t.Errorf("Parse(%q) first error begins at %d, want %d. Errors are:%s\n", tc.src, posErr0.Begin, tc.pos, err)
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}
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}
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}
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